[1] | 1 | /* |
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| 2 | * vmm.c - virtual memory manager related operations interface. |
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| 3 | * |
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| 4 | * Authors Ghassan Almaless (2008,2009,2010,2011, 2012) |
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| 5 | * Mohamed Lamine Karaoui (2015) |
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| 6 | * Alain Greiner (2016) |
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[21] | 7 | * |
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[1] | 8 | * Copyright (c) UPMC Sorbonne Universites |
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| 9 | * |
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| 10 | * This file is part of ALMOS-MKH. |
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| 11 | * |
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| 12 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 13 | * under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; version 2.0 of the License. |
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| 15 | * |
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| 16 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 19 | * General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 24 | */ |
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| 25 | |
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[14] | 26 | #include <kernel_config.h> |
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[1] | 27 | #include <hal_types.h> |
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| 28 | #include <hal_special.h> |
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| 29 | #include <hal_gpt.h> |
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[409] | 30 | #include <hal_vmm.h> |
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[1] | 31 | #include <printk.h> |
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[23] | 32 | #include <memcpy.h> |
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[1] | 33 | #include <rwlock.h> |
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| 34 | #include <list.h> |
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[408] | 35 | #include <xlist.h> |
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[1] | 36 | #include <bits.h> |
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| 37 | #include <process.h> |
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| 38 | #include <thread.h> |
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| 39 | #include <vseg.h> |
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| 40 | #include <cluster.h> |
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| 41 | #include <scheduler.h> |
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| 42 | #include <vfs.h> |
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| 43 | #include <mapper.h> |
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| 44 | #include <page.h> |
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| 45 | #include <kmem.h> |
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| 46 | #include <vmm.h> |
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| 47 | |
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| 48 | ////////////////////////////////////////////////////////////////////////////////// |
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| 49 | // Extern global variables |
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| 50 | ////////////////////////////////////////////////////////////////////////////////// |
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| 51 | |
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| 52 | extern process_t process_zero; // defined in cluster.c file |
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| 53 | |
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| 54 | |
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[415] | 55 | /////////////////////////////////////// |
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| 56 | error_t vmm_init( process_t * process ) |
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[21] | 57 | { |
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[1] | 58 | error_t error; |
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| 59 | vseg_t * vseg_kentry; |
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| 60 | vseg_t * vseg_args; |
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| 61 | vseg_t * vseg_envs; |
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| 62 | intptr_t base; |
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| 63 | intptr_t size; |
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| 64 | |
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[433] | 65 | #if CONFIG_DEBUG_VMM_INIT |
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| 66 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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| 67 | if( CONFIG_DEBUG_VMM_INIT ) |
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| 68 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
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| 69 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
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| 70 | #endif |
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[204] | 71 | |
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[1] | 72 | // get pointer on VMM |
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| 73 | vmm_t * vmm = &process->vmm; |
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| 74 | |
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[407] | 75 | // initialize local list of vsegs |
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| 76 | vmm->vsegs_nr = 0; |
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[408] | 77 | xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) ); |
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| 78 | remote_rwlock_init( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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[407] | 79 | |
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[204] | 80 | assert( ((CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE) |
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| 81 | <= CONFIG_VMM_ELF_BASE) , __FUNCTION__ , "UTILS zone too small\n" ); |
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[21] | 82 | |
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[204] | 83 | assert( (CONFIG_THREAD_MAX_PER_CLUSTER <= 32) , __FUNCTION__ , |
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| 84 | "no more than 32 threads per cluster for a single process\n"); |
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[1] | 85 | |
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[204] | 86 | assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREAD_MAX_PER_CLUSTER) <= |
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| 87 | (CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) , __FUNCTION__ , |
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| 88 | "STACK zone too small\n"); |
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[1] | 89 | |
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[409] | 90 | // register kentry vseg in VSL |
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[406] | 91 | base = CONFIG_VMM_KENTRY_BASE << CONFIG_PPM_PAGE_SHIFT; |
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[1] | 92 | size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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[406] | 93 | |
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[407] | 94 | vseg_kentry = vmm_create_vseg( process, |
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| 95 | VSEG_TYPE_CODE, |
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| 96 | base, |
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| 97 | size, |
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| 98 | 0, // file_offset unused |
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| 99 | 0, // file_size unused |
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| 100 | XPTR_NULL, // mapper_xp unused |
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| 101 | local_cxy ); |
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[204] | 102 | |
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[415] | 103 | if( vseg_kentry == NULL ) |
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| 104 | { |
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| 105 | printk("\n[ERROR] in %s : cannot register kentry vseg\n", __FUNCTION__ ); |
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| 106 | return -1; |
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| 107 | } |
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[204] | 108 | |
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[406] | 109 | vmm->kent_vpn_base = base; |
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[1] | 110 | |
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[409] | 111 | // register args vseg in VSL |
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[406] | 112 | base = (CONFIG_VMM_KENTRY_BASE + |
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| 113 | CONFIG_VMM_KENTRY_SIZE ) << CONFIG_PPM_PAGE_SHIFT; |
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[1] | 114 | size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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[406] | 115 | |
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[407] | 116 | vseg_args = vmm_create_vseg( process, |
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| 117 | VSEG_TYPE_DATA, |
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| 118 | base, |
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| 119 | size, |
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| 120 | 0, // file_offset unused |
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| 121 | 0, // file_size unused |
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| 122 | XPTR_NULL, // mapper_xp unused |
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| 123 | local_cxy ); |
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[204] | 124 | |
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[415] | 125 | if( vseg_args == NULL ) |
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| 126 | { |
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| 127 | printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ ); |
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| 128 | return -1; |
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| 129 | } |
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[204] | 130 | |
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[406] | 131 | vmm->args_vpn_base = base; |
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[1] | 132 | |
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[409] | 133 | // register the envs vseg in VSL |
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[406] | 134 | base = (CONFIG_VMM_KENTRY_BASE + |
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| 135 | CONFIG_VMM_KENTRY_SIZE + |
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| 136 | CONFIG_VMM_ARGS_SIZE ) << CONFIG_PPM_PAGE_SHIFT; |
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[1] | 137 | size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT; |
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[406] | 138 | |
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[407] | 139 | vseg_envs = vmm_create_vseg( process, |
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| 140 | VSEG_TYPE_DATA, |
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| 141 | base, |
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| 142 | size, |
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| 143 | 0, // file_offset unused |
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| 144 | 0, // file_size unused |
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| 145 | XPTR_NULL, // mapper_xp unused |
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| 146 | local_cxy ); |
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[204] | 147 | |
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[415] | 148 | if( vseg_envs == NULL ) |
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| 149 | { |
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| 150 | printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ ); |
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| 151 | return -1; |
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| 152 | } |
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[204] | 153 | |
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[406] | 154 | vmm->envs_vpn_base = base; |
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[1] | 155 | |
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[409] | 156 | // create GPT (empty) |
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[1] | 157 | error = hal_gpt_create( &vmm->gpt ); |
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| 158 | |
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[415] | 159 | if( error ) |
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| 160 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
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[204] | 161 | |
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[415] | 162 | // initialize GPT (architecture specic) |
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[409] | 163 | // (For TSAR, identity map the kentry_vseg) |
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| 164 | error = hal_vmm_init( vmm ); |
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| 165 | |
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[415] | 166 | if( error ) |
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| 167 | printk("\n[ERROR] in %s : cannot initialize GPT\n", __FUNCTION__ ); |
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[409] | 168 | |
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[1] | 169 | // initialize STACK allocator |
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| 170 | vmm->stack_mgr.bitmap = 0; |
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| 171 | vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE; |
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| 172 | |
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| 173 | // initialize MMAP allocator |
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[407] | 174 | vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE; |
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| 175 | vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE; |
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| 176 | vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE; |
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[1] | 177 | uint32_t i; |
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| 178 | for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] ); |
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| 179 | |
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[21] | 180 | // initialize instrumentation counters |
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[409] | 181 | vmm->pgfault_nr = 0; |
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[1] | 182 | |
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[124] | 183 | hal_fence(); |
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[1] | 184 | |
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[433] | 185 | #if CONFIG_DEBUG_VMM_INIT |
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| 186 | cycle = (uint32_t)hal_get_cycles(); |
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| 187 | if( CONFIG_DEBUG_VMM_INIT ) |
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| 188 | printk("\n[DBG] %s : thread %x exit for process %x / entry_point = %x / cycle %d\n", |
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| 189 | __FUNCTION__ , CURRENT_THREAD , process->pid , process->vmm.entry_point , cycle ); |
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| 190 | #endif |
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[204] | 191 | |
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[415] | 192 | return 0; |
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| 193 | |
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[204] | 194 | } // end vmm_init() |
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| 195 | |
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[407] | 196 | ////////////////////////////////////// |
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| 197 | void vmm_display( process_t * process, |
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| 198 | bool_t mapping ) |
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| 199 | { |
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[429] | 200 | assert( (process->ref_xp == XPTR( local_cxy , process )) , __FUNCTION__, |
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| 201 | "this function must be executed in reference cluster" ); |
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| 202 | |
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[407] | 203 | vmm_t * vmm = &process->vmm; |
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| 204 | gpt_t * gpt = &vmm->gpt; |
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| 205 | |
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| 206 | printk("\n***** VSL and GPT for process %x\n\n", |
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| 207 | process->pid ); |
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| 208 | |
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| 209 | // get lock protecting the vseg list |
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[408] | 210 | remote_rwlock_rd_lock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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[407] | 211 | |
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| 212 | // scan the list of vsegs |
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[408] | 213 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
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| 214 | xptr_t iter_xp; |
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| 215 | xptr_t vseg_xp; |
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[407] | 216 | vseg_t * vseg; |
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[408] | 217 | XLIST_FOREACH( root_xp , iter_xp ) |
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[407] | 218 | { |
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[408] | 219 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
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[433] | 220 | vseg = GET_PTR( vseg_xp ); |
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[408] | 221 | |
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[407] | 222 | printk(" - %s : base = %X / size = %X / npages = %d\n", |
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| 223 | vseg_type_str( vseg->type ) , vseg->min , vseg->max - vseg->min , vseg->vpn_size ); |
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| 224 | |
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| 225 | if( mapping ) |
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| 226 | { |
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| 227 | vpn_t vpn; |
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| 228 | ppn_t ppn; |
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| 229 | uint32_t attr; |
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| 230 | vpn_t base = vseg->vpn_base; |
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| 231 | vpn_t size = vseg->vpn_size; |
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| 232 | for( vpn = base ; vpn < (base+size) ; vpn++ ) |
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| 233 | { |
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| 234 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
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| 235 | if( attr & GPT_MAPPED ) |
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| 236 | { |
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| 237 | printk(" . vpn = %X / attr = %X / ppn = %X\n", vpn , attr , ppn ); |
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| 238 | } |
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| 239 | } |
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| 240 | } |
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| 241 | } |
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| 242 | |
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| 243 | // release the lock |
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[408] | 244 | remote_rwlock_rd_unlock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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[407] | 245 | |
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[408] | 246 | } // vmm_display() |
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| 247 | |
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[433] | 248 | /////////////////////i////////////////////////// |
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| 249 | void vmm_global_update_pte( process_t * process, |
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| 250 | vpn_t vpn, |
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| 251 | uint32_t attr, |
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| 252 | ppn_t ppn ) |
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[23] | 253 | { |
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| 254 | |
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[408] | 255 | xlist_entry_t * process_root_ptr; |
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| 256 | xptr_t process_root_xp; |
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| 257 | xptr_t process_iter_xp; |
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[23] | 258 | |
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[408] | 259 | xptr_t remote_process_xp; |
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| 260 | cxy_t remote_process_cxy; |
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| 261 | process_t * remote_process_ptr; |
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| 262 | xptr_t remote_gpt_xp; |
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[23] | 263 | |
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[408] | 264 | pid_t pid; |
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| 265 | cxy_t owner_cxy; |
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| 266 | lpid_t owner_lpid; |
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[23] | 267 | |
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[433] | 268 | #if CONFIG_DEBUG_VMM_UPDATE_PTE |
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| 269 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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| 270 | if( CONFIG_DEBUG_VMM_UPDATE_PTE < cycle ) |
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| 271 | printk("\n[DBG] %s : thread %x enter for process %x / vpn %x / cycle %d\n", |
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| 272 | __FUNCTION__ , CURRENT_THREAD , process->pid , vpn , cycle ); |
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| 273 | #endif |
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| 274 | |
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| 275 | // check cluster is reference |
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| 276 | assert( (GET_CXY( process->ref_xp ) == local_cxy) , __FUNCTION__, |
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| 277 | "not called in reference cluster\n"); |
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| 278 | |
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[408] | 279 | // get extended pointer on root of process copies xlist in owner cluster |
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| 280 | pid = process->pid; |
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| 281 | owner_cxy = CXY_FROM_PID( pid ); |
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| 282 | owner_lpid = LPID_FROM_PID( pid ); |
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| 283 | process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid]; |
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| 284 | process_root_xp = XPTR( owner_cxy , process_root_ptr ); |
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[23] | 285 | |
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[408] | 286 | // loop on destination process copies |
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| 287 | XLIST_FOREACH( process_root_xp , process_iter_xp ) |
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| 288 | { |
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| 289 | // get cluster and local pointer on remote process |
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| 290 | remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list ); |
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[433] | 291 | remote_process_ptr = GET_PTR( remote_process_xp ); |
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[408] | 292 | remote_process_cxy = GET_CXY( remote_process_xp ); |
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[407] | 293 | |
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[433] | 294 | #if (CONFIG_DEBUG_VMM_UPDATE_PTE & 0x1) |
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| 295 | if( CONFIG_DEBUG_VMM_UPDATE_PTE < cycle ) |
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| 296 | printk("\n[DBG] %s : thread %x handling process %x in cluster %x\n", |
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| 297 | __FUNCTION__ , CURRENT_THREAD , process->pid , remote_process_cxy ); |
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| 298 | #endif |
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| 299 | |
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[408] | 300 | // get extended pointer on remote gpt |
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| 301 | remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt ); |
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| 302 | |
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[433] | 303 | // update remote GPT |
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| 304 | hal_gpt_update_pte( remote_gpt_xp, vpn, attr, ppn ); |
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[408] | 305 | } |
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| 306 | |
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[433] | 307 | #if CONFIG_DEBUG_VMM_UPDATE_PTE |
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| 308 | cycle = (uint32_t)hal_get_cycles(); |
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| 309 | if( CONFIG_DEBUG_VMM_UPDATE_PTE < cycle ) |
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| 310 | printk("\n[DBG] %s : thread %x exit for process %x / vpn %x / cycle %d\n", |
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| 311 | __FUNCTION__ , CURRENT_THREAD , process->pid , vpn , cycle ); |
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| 312 | #endif |
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| 313 | |
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| 314 | } // end vmm_global_update_pte() |
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| 315 | |
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[408] | 316 | /////////////////////////////////////// |
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| 317 | void vmm_set_cow( process_t * process ) |
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| 318 | { |
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| 319 | vmm_t * vmm; |
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| 320 | |
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| 321 | xlist_entry_t * process_root_ptr; |
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| 322 | xptr_t process_root_xp; |
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| 323 | xptr_t process_iter_xp; |
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| 324 | |
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| 325 | xptr_t remote_process_xp; |
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| 326 | cxy_t remote_process_cxy; |
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| 327 | process_t * remote_process_ptr; |
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| 328 | xptr_t remote_gpt_xp; |
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| 329 | |
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| 330 | xptr_t vseg_root_xp; |
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| 331 | xptr_t vseg_iter_xp; |
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| 332 | |
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| 333 | xptr_t vseg_xp; |
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| 334 | vseg_t * vseg; |
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| 335 | |
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| 336 | pid_t pid; |
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| 337 | cxy_t owner_cxy; |
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| 338 | lpid_t owner_lpid; |
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| 339 | |
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[433] | 340 | #if CONFIG_DEBUG_VMM_SET_COW |
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| 341 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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| 342 | if( CONFIG_DEBUG_VMM_SET_COW < cycle ) |
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| 343 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
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| 344 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
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| 345 | #endif |
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[408] | 346 | |
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| 347 | // check cluster is reference |
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| 348 | assert( (GET_CXY( process->ref_xp ) == local_cxy) , __FUNCTION__, |
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| 349 | "local cluster is not process reference cluster\n"); |
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| 350 | |
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| 351 | // get pointer on reference VMM |
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| 352 | vmm = &process->vmm; |
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| 353 | |
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| 354 | // get extended pointer on root of process copies xlist in owner cluster |
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| 355 | pid = process->pid; |
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| 356 | owner_cxy = CXY_FROM_PID( pid ); |
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| 357 | owner_lpid = LPID_FROM_PID( pid ); |
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| 358 | process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid]; |
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| 359 | process_root_xp = XPTR( owner_cxy , process_root_ptr ); |
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| 360 | |
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| 361 | // get extended pointer on root of vsegs xlist from reference VMM |
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| 362 | vseg_root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
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| 363 | |
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| 364 | // loop on destination process copies |
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| 365 | XLIST_FOREACH( process_root_xp , process_iter_xp ) |
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| 366 | { |
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| 367 | // get cluster and local pointer on remote process |
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| 368 | remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list ); |
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[433] | 369 | remote_process_ptr = GET_PTR( remote_process_xp ); |
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[408] | 370 | remote_process_cxy = GET_CXY( remote_process_xp ); |
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| 371 | |
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[433] | 372 | #if (CONFIG_DEBUG_VMM_SET_COW &0x1) |
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| 373 | if( CONFIG_DEBUG_VMM_SET_COW < cycle ) |
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| 374 | printk("\n[DBG] %s : thread %x handling process %x in cluster %x\n", |
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| 375 | __FUNCTION__ , CURRENT_THREAD , process->pid , remote_process_cxy ); |
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| 376 | #endif |
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[408] | 377 | |
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| 378 | // get extended pointer on remote gpt |
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| 379 | remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt ); |
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| 380 | |
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| 381 | // loop on vsegs in (local) reference process VSL |
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| 382 | XLIST_FOREACH( vseg_root_xp , vseg_iter_xp ) |
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| 383 | { |
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| 384 | // get pointer on vseg |
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| 385 | vseg_xp = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist ); |
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[433] | 386 | vseg = GET_PTR( vseg_xp ); |
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[408] | 387 | |
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| 388 | assert( (GET_CXY( vseg_xp ) == local_cxy) , __FUNCTION__, |
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| 389 | "all vsegs in reference VSL must be local\n" ); |
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| 390 | |
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| 391 | // get vseg type, base and size |
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| 392 | uint32_t type = vseg->type; |
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| 393 | vpn_t vpn_base = vseg->vpn_base; |
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| 394 | vpn_t vpn_size = vseg->vpn_size; |
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| 395 | |
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[433] | 396 | #if (CONFIG_DEBUG_VMM_SET_COW & 0x1) |
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| 397 | if( CONFIG_DEBUG_VMM_SET_COW < cycle ) |
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| 398 | printk("\n[DBG] %s : thread %x handling vseg %s / vpn_base = %x / vpn_size = %x\n", |
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| 399 | __FUNCTION__, CURRENT_THREAD , vseg_type_str(type), vpn_base, vpn_size ); |
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| 400 | #endif |
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| 401 | // only DATA, ANON and REMOTE vsegs |
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[408] | 402 | if( (type == VSEG_TYPE_DATA) || |
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| 403 | (type == VSEG_TYPE_ANON) || |
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| 404 | (type == VSEG_TYPE_REMOTE) ) |
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| 405 | { |
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[433] | 406 | vpn_t vpn; |
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| 407 | uint32_t attr; |
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| 408 | ppn_t ppn; |
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| 409 | xptr_t page_xp; |
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| 410 | cxy_t page_cxy; |
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| 411 | page_t * page_ptr; |
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| 412 | xptr_t forks_xp; |
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| 413 | |
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| 414 | // update flags in remote GPT |
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| 415 | hal_gpt_set_cow( remote_gpt_xp, |
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| 416 | vpn_base, |
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| 417 | vpn_size ); |
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| 418 | |
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| 419 | // atomically increment pending forks counter in physical pages, |
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| 420 | // for all vseg pages that are mapped in reference cluster |
---|
| 421 | if( remote_process_cxy == local_cxy ) |
---|
| 422 | { |
---|
| 423 | // the reference GPT is the local GPT |
---|
| 424 | gpt_t * gpt = GET_PTR( remote_gpt_xp ); |
---|
| 425 | |
---|
| 426 | // scan all pages in vseg |
---|
| 427 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
---|
| 428 | { |
---|
| 429 | // get page attributes and PPN from reference GPT |
---|
| 430 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
---|
| 431 | |
---|
| 432 | // atomically update pending forks counter if page is mapped |
---|
| 433 | if( attr & GPT_MAPPED ) |
---|
| 434 | { |
---|
| 435 | page_xp = ppm_ppn2page( ppn ); |
---|
| 436 | page_cxy = GET_CXY( page_xp ); |
---|
| 437 | page_ptr = GET_PTR( page_xp ); |
---|
| 438 | forks_xp = XPTR( page_cxy , &page_ptr->forks ); |
---|
| 439 | hal_remote_atomic_add( forks_xp , 1 ); |
---|
| 440 | } |
---|
| 441 | } // end loop on vpn |
---|
| 442 | } // end if local |
---|
| 443 | } // end if vseg type |
---|
| 444 | } // end loop on vsegs |
---|
[408] | 445 | } // end loop on process copies |
---|
| 446 | |
---|
[433] | 447 | #if CONFIG_DEBUG_VMM_SET_COW |
---|
| 448 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 449 | if( CONFIG_DEBUG_VMM_SET_COW < cycle ) |
---|
| 450 | printk("\n[DBG] %s : thread %x exit for process %x / cycle %d\n", |
---|
| 451 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
---|
| 452 | #endif |
---|
[408] | 453 | |
---|
| 454 | } // end vmm_set-cow() |
---|
| 455 | |
---|
| 456 | ///////////////////////////////////////////////// |
---|
| 457 | error_t vmm_fork_copy( process_t * child_process, |
---|
| 458 | xptr_t parent_process_xp ) |
---|
| 459 | { |
---|
| 460 | error_t error; |
---|
| 461 | cxy_t parent_cxy; |
---|
| 462 | process_t * parent_process; |
---|
| 463 | vmm_t * parent_vmm; |
---|
| 464 | xptr_t parent_lock_xp; |
---|
| 465 | vmm_t * child_vmm; |
---|
| 466 | xptr_t iter_xp; |
---|
| 467 | xptr_t parent_vseg_xp; |
---|
| 468 | vseg_t * parent_vseg; |
---|
| 469 | vseg_t * child_vseg; |
---|
| 470 | uint32_t type; |
---|
| 471 | bool_t cow; |
---|
| 472 | vpn_t vpn; |
---|
| 473 | vpn_t vpn_base; |
---|
| 474 | vpn_t vpn_size; |
---|
| 475 | xptr_t page_xp; |
---|
| 476 | page_t * page_ptr; |
---|
| 477 | cxy_t page_cxy; |
---|
| 478 | xptr_t parent_root_xp; |
---|
| 479 | bool_t mapped; |
---|
| 480 | ppn_t ppn; |
---|
| 481 | |
---|
[433] | 482 | #if CONFIG_DEBUG_VMM_FORK_COPY |
---|
| 483 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 484 | if( CONFIG_DEBUG_VMM_FORK_COPY < cycle ) |
---|
| 485 | printk("\n[DBG] %s : thread %x enter / cycle %d\n", |
---|
| 486 | __FUNCTION__ , CURRENT_THREAD, cycle ); |
---|
| 487 | #endif |
---|
[408] | 488 | |
---|
| 489 | // get parent process cluster and local pointer |
---|
| 490 | parent_cxy = GET_CXY( parent_process_xp ); |
---|
[433] | 491 | parent_process = GET_PTR( parent_process_xp ); |
---|
[408] | 492 | |
---|
| 493 | // get local pointers on parent and child VMM |
---|
| 494 | parent_vmm = &parent_process->vmm; |
---|
| 495 | child_vmm = &child_process->vmm; |
---|
| 496 | |
---|
| 497 | // get extended pointer on lock protecting the parent VSL |
---|
| 498 | parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsegs_lock ); |
---|
| 499 | |
---|
| 500 | // initialize the lock protecting the child VSL |
---|
| 501 | remote_rwlock_init( XPTR( local_cxy , &child_vmm->vsegs_lock ) ); |
---|
| 502 | |
---|
| 503 | // initialize the child VSL as empty |
---|
| 504 | xlist_root_init( XPTR( local_cxy, &child_vmm->vsegs_root ) ); |
---|
| 505 | child_vmm->vsegs_nr = 0; |
---|
| 506 | |
---|
[415] | 507 | // create child GPT |
---|
[408] | 508 | error = hal_gpt_create( &child_vmm->gpt ); |
---|
[415] | 509 | |
---|
[407] | 510 | if( error ) |
---|
| 511 | { |
---|
[408] | 512 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
---|
| 513 | return -1; |
---|
[407] | 514 | } |
---|
| 515 | |
---|
[408] | 516 | // build extended pointer on parent VSL |
---|
| 517 | parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root ); |
---|
| 518 | |
---|
[415] | 519 | // take the lock protecting the parent VSL |
---|
| 520 | remote_rwlock_rd_lock( parent_lock_xp ); |
---|
| 521 | |
---|
[408] | 522 | // loop on parent VSL xlist |
---|
| 523 | XLIST_FOREACH( parent_root_xp , iter_xp ) |
---|
[23] | 524 | { |
---|
[408] | 525 | // get local and extended pointers on current parent vseg |
---|
| 526 | parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
[433] | 527 | parent_vseg = GET_PTR( parent_vseg_xp ); |
---|
[23] | 528 | |
---|
[408] | 529 | // get vseg type |
---|
| 530 | type = hal_remote_lw( XPTR( parent_cxy , &parent_vseg->type ) ); |
---|
| 531 | |
---|
[433] | 532 | #if CONFIG_DEBUG_VMM_FORK_COPY |
---|
| 533 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 534 | if( CONFIG_DEBUG_VMM_FORK_COPY < cycle ) |
---|
| 535 | printk("\n[DBG] %s : thread %x found parent vseg %s / vpn_base = %x / cycle %d\n", |
---|
| 536 | __FUNCTION__ , CURRENT_THREAD, vseg_type_str(type), |
---|
| 537 | hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle ); |
---|
| 538 | #endif |
---|
[23] | 539 | |
---|
[408] | 540 | // all parent vsegs - but STACK - must be copied in child VSL |
---|
| 541 | if( type != VSEG_TYPE_STACK ) |
---|
[23] | 542 | { |
---|
[408] | 543 | // allocate memory for a new child vseg |
---|
| 544 | child_vseg = vseg_alloc(); |
---|
| 545 | if( child_vseg == NULL ) // release all allocated vsegs |
---|
[23] | 546 | { |
---|
[408] | 547 | vmm_destroy( child_process ); |
---|
| 548 | printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ ); |
---|
| 549 | return -1; |
---|
[23] | 550 | } |
---|
| 551 | |
---|
[408] | 552 | // copy parent vseg to child vseg |
---|
| 553 | vseg_init_from_ref( child_vseg , parent_vseg_xp ); |
---|
[23] | 554 | |
---|
[408] | 555 | // register child vseg in child VSL |
---|
| 556 | vseg_attach( child_vmm , child_vseg ); |
---|
[407] | 557 | |
---|
[433] | 558 | #if CONFIG_DEBUG_VMM_FORK_COPY |
---|
| 559 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 560 | if( CONFIG_DEBUG_VMM_FORK_COPY < cycle ) |
---|
| 561 | printk("\n[DBG] %s : thread %x copied vseg %s / vpn_base = %x to child VSL / cycle %d\n", |
---|
| 562 | __FUNCTION__ , CURRENT_THREAD , vseg_type_str(type), |
---|
| 563 | hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle ); |
---|
| 564 | #endif |
---|
[23] | 565 | |
---|
[408] | 566 | // copy DATA, MMAP, REMOTE, FILE parent GPT entries to child GPT |
---|
| 567 | if( type != VSEG_TYPE_CODE ) |
---|
| 568 | { |
---|
| 569 | // activate the COW for DATA, MMAP, REMOTE vsegs only |
---|
| 570 | cow = ( type != VSEG_TYPE_FILE ); |
---|
[23] | 571 | |
---|
[408] | 572 | vpn_base = child_vseg->vpn_base; |
---|
| 573 | vpn_size = child_vseg->vpn_size; |
---|
[23] | 574 | |
---|
[408] | 575 | // scan pages in parent vseg |
---|
| 576 | for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ ) |
---|
| 577 | { |
---|
| 578 | error = hal_gpt_pte_copy( &child_vmm->gpt, |
---|
| 579 | XPTR( parent_cxy , &parent_vmm->gpt ), |
---|
| 580 | vpn, |
---|
| 581 | cow, |
---|
| 582 | &ppn, |
---|
| 583 | &mapped ); |
---|
| 584 | if( error ) |
---|
| 585 | { |
---|
| 586 | vmm_destroy( child_process ); |
---|
| 587 | printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ ); |
---|
| 588 | return -1; |
---|
| 589 | } |
---|
| 590 | |
---|
[433] | 591 | // increment pending forks counter in page if mapped |
---|
[408] | 592 | if( mapped ) |
---|
| 593 | { |
---|
| 594 | page_xp = ppm_ppn2page( ppn ); |
---|
| 595 | page_cxy = GET_CXY( page_xp ); |
---|
[433] | 596 | page_ptr = GET_PTR( page_xp ); |
---|
| 597 | hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , 1 ); |
---|
[408] | 598 | |
---|
[433] | 599 | #if CONFIG_DEBUG_VMM_FORK_COPY |
---|
| 600 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 601 | if( CONFIG_DEBUG_VMM_FORK_COPY < cycle ) |
---|
| 602 | printk("\n[DBG] %s : thread %x copied vpn %x to child GPT / cycle %d\n", |
---|
| 603 | __FUNCTION__ , CURRENT_THREAD , vpn , cycle ); |
---|
| 604 | #endif |
---|
[408] | 605 | |
---|
| 606 | } |
---|
| 607 | } |
---|
| 608 | } // end if no code & no stack |
---|
| 609 | } // end if no stack |
---|
| 610 | } // end loop on vsegs |
---|
| 611 | |
---|
| 612 | // release the parent vsegs lock |
---|
| 613 | remote_rwlock_rd_unlock( parent_lock_xp ); |
---|
| 614 | |
---|
[415] | 615 | // initialize child GPT (architecture specic) |
---|
| 616 | // => For TSAR, identity map the kentry_vseg |
---|
| 617 | error = hal_vmm_init( child_vmm ); |
---|
| 618 | |
---|
| 619 | if( error ) |
---|
| 620 | { |
---|
| 621 | printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ ); |
---|
| 622 | return -1; |
---|
| 623 | } |
---|
| 624 | |
---|
[408] | 625 | // initialize the child VMM STACK allocator |
---|
| 626 | child_vmm->stack_mgr.bitmap = 0; |
---|
| 627 | child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE; |
---|
| 628 | |
---|
| 629 | // initialize the child VMM MMAP allocator |
---|
[23] | 630 | uint32_t i; |
---|
[408] | 631 | child_vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE; |
---|
| 632 | child_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE; |
---|
| 633 | child_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE; |
---|
| 634 | for( i = 0 ; i < 32 ; i++ ) list_root_init( &child_vmm->mmap_mgr.zombi_list[i] ); |
---|
[23] | 635 | |
---|
[178] | 636 | // initialize instrumentation counters |
---|
[408] | 637 | child_vmm->pgfault_nr = 0; |
---|
[23] | 638 | |
---|
[408] | 639 | // copy base addresses from parent VMM to child VMM |
---|
| 640 | child_vmm->kent_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->kent_vpn_base)); |
---|
| 641 | child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base)); |
---|
| 642 | child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base)); |
---|
| 643 | child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base)); |
---|
| 644 | child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base)); |
---|
| 645 | child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base)); |
---|
[23] | 646 | |
---|
[408] | 647 | child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point)); |
---|
[23] | 648 | |
---|
[124] | 649 | hal_fence(); |
---|
[23] | 650 | |
---|
[433] | 651 | #if CONFIG_DEBUG_VMM_FORK_COPY |
---|
| 652 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 653 | if( CONFIG_DEBUG_VMM_FORK_COPY < cycle ) |
---|
| 654 | printk("\n[DBG] %s : thread %x exit successfully / cycle %d\n", |
---|
| 655 | __FUNCTION__ , CURRENT_THREAD , cycle ); |
---|
| 656 | #endif |
---|
| 657 | |
---|
[23] | 658 | return 0; |
---|
| 659 | |
---|
[408] | 660 | } // vmm_fork_copy() |
---|
[204] | 661 | |
---|
[1] | 662 | /////////////////////////////////////// |
---|
| 663 | void vmm_destroy( process_t * process ) |
---|
| 664 | { |
---|
[408] | 665 | xptr_t vseg_xp; |
---|
[1] | 666 | vseg_t * vseg; |
---|
| 667 | |
---|
[433] | 668 | #if CONFIG_DEBUG_VMM_DESTROY |
---|
| 669 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 670 | if( CONFIG_DEBUG_VMM_DESTROY < cycle ) |
---|
| 671 | printk("\n[DBG] %s : thread %x enter for process %x / cycle %d\n", |
---|
| 672 | __FUNCTION__ , CURRENT_THREAD , process->pid , cycle ); |
---|
| 673 | #endif |
---|
[416] | 674 | |
---|
[433] | 675 | // get pointer on local VMM |
---|
[1] | 676 | vmm_t * vmm = &process->vmm; |
---|
| 677 | |
---|
[408] | 678 | // get extended pointer on VSL root and VSL lock |
---|
| 679 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
| 680 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
| 681 | |
---|
[1] | 682 | // get lock protecting vseg list |
---|
[408] | 683 | remote_rwlock_wr_lock( lock_xp ); |
---|
[1] | 684 | |
---|
[409] | 685 | // remove all user vsegs registered in VSL |
---|
[408] | 686 | while( !xlist_is_empty( root_xp ) ) |
---|
[1] | 687 | { |
---|
[409] | 688 | // get pointer on first vseg in VSL |
---|
[408] | 689 | vseg_xp = XLIST_FIRST_ELEMENT( root_xp , vseg_t , xlist ); |
---|
[433] | 690 | vseg = GET_PTR( vseg_xp ); |
---|
[409] | 691 | |
---|
[433] | 692 | // unmap rand release physical pages if required) |
---|
[409] | 693 | vmm_unmap_vseg( process , vseg ); |
---|
| 694 | |
---|
| 695 | // remove vseg from VSL |
---|
[1] | 696 | vseg_detach( vmm , vseg ); |
---|
[409] | 697 | |
---|
| 698 | // release memory allocated to vseg descriptor |
---|
[1] | 699 | vseg_free( vseg ); |
---|
| 700 | } |
---|
| 701 | |
---|
[433] | 702 | // release lock protecting VSL |
---|
[408] | 703 | remote_rwlock_wr_unlock( lock_xp ); |
---|
[1] | 704 | |
---|
| 705 | // remove all vsegs from zombi_lists in MMAP allocator |
---|
| 706 | uint32_t i; |
---|
| 707 | for( i = 0 ; i<32 ; i++ ) |
---|
| 708 | { |
---|
| 709 | while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) ) |
---|
| 710 | { |
---|
[408] | 711 | vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , zlist ); |
---|
[1] | 712 | vseg_detach( vmm , vseg ); |
---|
| 713 | vseg_free( vseg ); |
---|
| 714 | } |
---|
| 715 | } |
---|
| 716 | |
---|
[409] | 717 | // release memory allocated to the GPT itself |
---|
[1] | 718 | hal_gpt_destroy( &vmm->gpt ); |
---|
| 719 | |
---|
[433] | 720 | #if CONFIG_DEBUG_VMM_DESTROY |
---|
| 721 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 722 | if( CONFIG_DEBUG_VMM_DESTROY < cycle ) |
---|
| 723 | printk("\n[DBG] %s : thread %x exit / cycle %d\n", |
---|
| 724 | __FUNCTION__ , CURRENT_THREAD , cycle ); |
---|
| 725 | #endif |
---|
[416] | 726 | |
---|
[204] | 727 | } // end vmm_destroy() |
---|
| 728 | |
---|
[1] | 729 | ///////////////////////////////////////////////// |
---|
| 730 | vseg_t * vmm_check_conflict( process_t * process, |
---|
[21] | 731 | vpn_t vpn_base, |
---|
[1] | 732 | vpn_t vpn_size ) |
---|
| 733 | { |
---|
| 734 | vmm_t * vmm = &process->vmm; |
---|
[408] | 735 | |
---|
| 736 | // scan the VSL |
---|
[1] | 737 | vseg_t * vseg; |
---|
[408] | 738 | xptr_t iter_xp; |
---|
| 739 | xptr_t vseg_xp; |
---|
| 740 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
[1] | 741 | |
---|
[408] | 742 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
[1] | 743 | { |
---|
[408] | 744 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
[433] | 745 | vseg = GET_PTR( vseg_xp ); |
---|
[204] | 746 | |
---|
[21] | 747 | if( ((vpn_base + vpn_size) > vseg->vpn_base) && |
---|
| 748 | (vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg; |
---|
[1] | 749 | } |
---|
| 750 | return NULL; |
---|
| 751 | |
---|
[204] | 752 | } // end vmm_check_conflict() |
---|
| 753 | |
---|
[1] | 754 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 755 | // This static function is called by the vmm_create_vseg() function, and implements |
---|
| 756 | // the VMM stack_vseg specific allocator. |
---|
| 757 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 758 | // @ vmm : pointer on VMM. |
---|
[21] | 759 | // @ vpn_base : (return value) first allocated page |
---|
[1] | 760 | // @ vpn_size : (return value) number of allocated pages |
---|
| 761 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 762 | static error_t vmm_stack_alloc( vmm_t * vmm, |
---|
| 763 | vpn_t * vpn_base, |
---|
| 764 | vpn_t * vpn_size ) |
---|
| 765 | { |
---|
| 766 | // get stack allocator pointer |
---|
| 767 | stack_mgr_t * mgr = &vmm->stack_mgr; |
---|
| 768 | |
---|
| 769 | // get lock on stack allocator |
---|
| 770 | spinlock_lock( &mgr->lock ); |
---|
| 771 | |
---|
| 772 | // get first free slot index in bitmap |
---|
| 773 | int32_t index = bitmap_ffc( &mgr->bitmap , 4 ); |
---|
[179] | 774 | if( (index < 0) || (index > 31) ) |
---|
| 775 | { |
---|
| 776 | spinlock_unlock( &mgr->lock ); |
---|
| 777 | return ENOMEM; |
---|
| 778 | } |
---|
[1] | 779 | |
---|
| 780 | // update bitmap |
---|
| 781 | bitmap_set( &mgr->bitmap , index ); |
---|
[21] | 782 | |
---|
[1] | 783 | // release lock on stack allocator |
---|
| 784 | spinlock_unlock( &mgr->lock ); |
---|
| 785 | |
---|
[21] | 786 | // returns vpn_base, vpn_size (one page non allocated) |
---|
[1] | 787 | *vpn_base = mgr->vpn_base + index * CONFIG_VMM_STACK_SIZE + 1; |
---|
| 788 | *vpn_size = CONFIG_VMM_STACK_SIZE - 1; |
---|
| 789 | return 0; |
---|
| 790 | |
---|
[204] | 791 | } // end vmm_stack_alloc() |
---|
| 792 | |
---|
[1] | 793 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 794 | // This static function is called by the vmm_create_vseg() function, and implements |
---|
| 795 | // the VMM MMAP specific allocator. |
---|
| 796 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 797 | // @ vmm : [in] pointer on VMM. |
---|
| 798 | // @ npages : [in] requested number of pages. |
---|
[21] | 799 | // @ vpn_base : [out] first allocated page. |
---|
[1] | 800 | // @ vpn_size : [out] actual number of allocated pages. |
---|
| 801 | //////////////////////////////////////////////////////////////////////////////////////////// |
---|
| 802 | static error_t vmm_mmap_alloc( vmm_t * vmm, |
---|
| 803 | vpn_t npages, |
---|
| 804 | vpn_t * vpn_base, |
---|
| 805 | vpn_t * vpn_size ) |
---|
| 806 | { |
---|
| 807 | uint32_t index; |
---|
| 808 | vseg_t * vseg; |
---|
| 809 | vpn_t base; |
---|
| 810 | vpn_t size; |
---|
[21] | 811 | vpn_t free; |
---|
[1] | 812 | |
---|
[21] | 813 | // mmap vseg size must be power of 2 |
---|
[1] | 814 | // compute actual size and index in zombi_list array |
---|
| 815 | size = POW2_ROUNDUP( npages ); |
---|
| 816 | index = bits_log2( size ); |
---|
| 817 | |
---|
| 818 | // get mmap allocator pointer |
---|
| 819 | mmap_mgr_t * mgr = &vmm->mmap_mgr; |
---|
| 820 | |
---|
| 821 | // get lock on mmap allocator |
---|
| 822 | spinlock_lock( &mgr->lock ); |
---|
| 823 | |
---|
| 824 | // get vseg from zombi_list or from mmap zone |
---|
| 825 | if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone |
---|
| 826 | { |
---|
| 827 | // check overflow |
---|
| 828 | free = mgr->first_free_vpn; |
---|
| 829 | if( (free + size) > mgr->vpn_size ) return ENOMEM; |
---|
| 830 | |
---|
| 831 | // update STACK allocator |
---|
| 832 | mgr->first_free_vpn += size; |
---|
| 833 | |
---|
| 834 | // compute base |
---|
| 835 | base = free; |
---|
| 836 | } |
---|
| 837 | else // from zombi_list |
---|
| 838 | { |
---|
| 839 | // get pointer on zombi vseg from zombi_list |
---|
[408] | 840 | vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , zlist ); |
---|
[1] | 841 | |
---|
| 842 | // remove vseg from free-list |
---|
[408] | 843 | list_unlink( &vseg->zlist ); |
---|
[1] | 844 | |
---|
| 845 | // compute base |
---|
| 846 | base = vseg->vpn_base; |
---|
[21] | 847 | } |
---|
| 848 | |
---|
[1] | 849 | // release lock on mmap allocator |
---|
| 850 | spinlock_unlock( &mgr->lock ); |
---|
| 851 | |
---|
| 852 | // returns vpn_base, vpn_size |
---|
| 853 | *vpn_base = base; |
---|
| 854 | *vpn_size = size; |
---|
| 855 | return 0; |
---|
| 856 | |
---|
[204] | 857 | } // end vmm_mmap_alloc() |
---|
| 858 | |
---|
[407] | 859 | //////////////////////////////////////////////// |
---|
| 860 | vseg_t * vmm_create_vseg( process_t * process, |
---|
| 861 | vseg_type_t type, |
---|
| 862 | intptr_t base, |
---|
| 863 | uint32_t size, |
---|
| 864 | uint32_t file_offset, |
---|
| 865 | uint32_t file_size, |
---|
| 866 | xptr_t mapper_xp, |
---|
| 867 | cxy_t cxy ) |
---|
[1] | 868 | { |
---|
| 869 | vseg_t * vseg; // created vseg pointer |
---|
[204] | 870 | vpn_t vpn_base; // first page index |
---|
[1] | 871 | vpn_t vpn_size; // number of pages |
---|
| 872 | error_t error; |
---|
| 873 | |
---|
[433] | 874 | #if CONFIG_DEBUG_VMM_CREATE_VSEG |
---|
| 875 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 876 | if( CONFIG_DEBUG_VMM_CREATE_VSEG < cycle ) |
---|
| 877 | printk("\n[DBG] %s : thread %x enter / process %x / base %x / size %x / %s / cxy %x / cycle %d\n", |
---|
| 878 | __FUNCTION__, CURRENT_THREAD, process->pid, base, size, vseg_type_str(type), cxy, cycle ); |
---|
| 879 | #endif |
---|
[21] | 880 | |
---|
[407] | 881 | // get pointer on VMM |
---|
| 882 | vmm_t * vmm = &process->vmm; |
---|
[21] | 883 | |
---|
[204] | 884 | // compute base, size, vpn_base, vpn_size, depending on vseg type |
---|
[407] | 885 | // we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs |
---|
[1] | 886 | if( type == VSEG_TYPE_STACK ) |
---|
| 887 | { |
---|
| 888 | // get vpn_base and vpn_size from STACK allocator |
---|
| 889 | error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size ); |
---|
| 890 | if( error ) |
---|
| 891 | { |
---|
[407] | 892 | printk("\n[ERROR] in %s : no space for stack vseg / process %x in cluster %x\n", |
---|
| 893 | __FUNCTION__ , process->pid , local_cxy ); |
---|
[1] | 894 | return NULL; |
---|
| 895 | } |
---|
| 896 | |
---|
| 897 | // compute vseg base and size from vpn_base and vpn_size |
---|
| 898 | base = vpn_base << CONFIG_PPM_PAGE_SHIFT; |
---|
| 899 | size = vpn_size << CONFIG_PPM_PAGE_SHIFT; |
---|
| 900 | } |
---|
[21] | 901 | else if( (type == VSEG_TYPE_ANON) || |
---|
| 902 | (type == VSEG_TYPE_FILE) || |
---|
[1] | 903 | (type == VSEG_TYPE_REMOTE) ) |
---|
| 904 | { |
---|
| 905 | // get vpn_base and vpn_size from MMAP allocator |
---|
| 906 | vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 907 | error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size ); |
---|
| 908 | if( error ) |
---|
| 909 | { |
---|
| 910 | printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n", |
---|
| 911 | __FUNCTION__ , process->pid , local_cxy ); |
---|
| 912 | return NULL; |
---|
| 913 | } |
---|
| 914 | |
---|
| 915 | // compute vseg base and size from vpn_base and vpn_size |
---|
| 916 | base = vpn_base << CONFIG_PPM_PAGE_SHIFT; |
---|
| 917 | size = vpn_size << CONFIG_PPM_PAGE_SHIFT; |
---|
| 918 | } |
---|
| 919 | else |
---|
| 920 | { |
---|
[204] | 921 | uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 922 | uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 923 | |
---|
| 924 | vpn_base = vpn_min; |
---|
| 925 | vpn_size = vpn_max - vpn_min + 1; |
---|
[1] | 926 | } |
---|
| 927 | |
---|
| 928 | // check collisions |
---|
| 929 | vseg = vmm_check_conflict( process , vpn_base , vpn_size ); |
---|
| 930 | if( vseg != NULL ) |
---|
| 931 | { |
---|
[21] | 932 | printk("\n[ERROR] in %s for process %x : new vseg [vpn_base = %x / vpn_size = %x]\n" |
---|
[1] | 933 | " overlap existing vseg [vpn_base = %x / vpn_size = %x]\n", |
---|
[407] | 934 | __FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size ); |
---|
[1] | 935 | return NULL; |
---|
| 936 | } |
---|
| 937 | |
---|
| 938 | // allocate physical memory for vseg descriptor |
---|
| 939 | vseg = vseg_alloc(); |
---|
| 940 | if( vseg == NULL ) |
---|
| 941 | { |
---|
| 942 | printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n", |
---|
[407] | 943 | __FUNCTION__ , process->pid ); |
---|
[1] | 944 | return NULL; |
---|
| 945 | } |
---|
| 946 | |
---|
| 947 | // initialize vseg descriptor |
---|
[407] | 948 | vseg_init( vseg, |
---|
| 949 | type, |
---|
| 950 | base, |
---|
| 951 | size, |
---|
| 952 | vpn_base, |
---|
| 953 | vpn_size, |
---|
| 954 | file_offset, |
---|
| 955 | file_size, |
---|
| 956 | mapper_xp, |
---|
| 957 | cxy ); |
---|
[1] | 958 | |
---|
[408] | 959 | // attach vseg to VSL |
---|
| 960 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
| 961 | remote_rwlock_wr_lock( lock_xp ); |
---|
[1] | 962 | vseg_attach( vmm , vseg ); |
---|
[408] | 963 | remote_rwlock_wr_unlock( lock_xp ); |
---|
[1] | 964 | |
---|
[433] | 965 | #if CONFIG_DEBUG_VMM_CREATE_VSEG |
---|
| 966 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 967 | if( CONFIG_DEBUG_VMM_CREATE_VSEG < cycle ) |
---|
| 968 | printk("\n[DBG] %s : thread %x exit / process %x / %s / cxy %x / cycle %d\n", |
---|
| 969 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str(type), cxy, cycle ); |
---|
| 970 | #endif |
---|
[21] | 971 | |
---|
[1] | 972 | return vseg; |
---|
| 973 | |
---|
[406] | 974 | } // vmm_create_vseg() |
---|
| 975 | |
---|
[1] | 976 | ///////////////////////////////////// |
---|
| 977 | void vmm_remove_vseg( vseg_t * vseg ) |
---|
| 978 | { |
---|
| 979 | // get pointers on calling process and VMM |
---|
| 980 | thread_t * this = CURRENT_THREAD; |
---|
| 981 | process_t * process = this->process; |
---|
| 982 | vmm_t * vmm = &this->process->vmm; |
---|
| 983 | uint32_t type = vseg->type; |
---|
| 984 | |
---|
[408] | 985 | // detach vseg from VSL |
---|
| 986 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
| 987 | remote_rwlock_wr_lock( lock_xp ); |
---|
| 988 | vseg_detach( &process->vmm , vseg ); |
---|
| 989 | remote_rwlock_wr_unlock( lock_xp ); |
---|
[1] | 990 | |
---|
| 991 | // release the stack slot to VMM stack allocator if STACK type |
---|
| 992 | if( type == VSEG_TYPE_STACK ) |
---|
| 993 | { |
---|
| 994 | // get pointer on stack allocator |
---|
| 995 | stack_mgr_t * mgr = &vmm->stack_mgr; |
---|
| 996 | |
---|
| 997 | // compute slot index |
---|
| 998 | uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE); |
---|
| 999 | |
---|
| 1000 | // update stacks_bitmap |
---|
| 1001 | spinlock_lock( &mgr->lock ); |
---|
| 1002 | bitmap_clear( &mgr->bitmap , index ); |
---|
| 1003 | spinlock_unlock( &mgr->lock ); |
---|
| 1004 | } |
---|
| 1005 | |
---|
| 1006 | // release the vseg to VMM mmap allocator if MMAP type |
---|
| 1007 | if( (type == VSEG_TYPE_ANON) || (type == VSEG_TYPE_FILE) || (type == VSEG_TYPE_REMOTE) ) |
---|
| 1008 | { |
---|
| 1009 | // get pointer on mmap allocator |
---|
| 1010 | mmap_mgr_t * mgr = &vmm->mmap_mgr; |
---|
| 1011 | |
---|
| 1012 | // compute zombi_list index |
---|
| 1013 | uint32_t index = bits_log2( vseg->vpn_size ); |
---|
| 1014 | |
---|
| 1015 | // update zombi_list |
---|
| 1016 | spinlock_lock( &mgr->lock ); |
---|
[408] | 1017 | list_add_first( &mgr->zombi_list[index] , &vseg->zlist ); |
---|
[1] | 1018 | spinlock_unlock( &mgr->lock ); |
---|
| 1019 | } |
---|
| 1020 | |
---|
| 1021 | // release physical memory allocated for vseg descriptor if no MMAP type |
---|
| 1022 | if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) ) |
---|
| 1023 | { |
---|
| 1024 | vseg_free( vseg ); |
---|
| 1025 | } |
---|
[407] | 1026 | } // end vmm_remove_vseg() |
---|
[1] | 1027 | |
---|
[68] | 1028 | ////////////////////////////////////////////// |
---|
| 1029 | error_t vmm_map_kernel_vseg( vseg_t * vseg, |
---|
| 1030 | uint32_t attr ) |
---|
[1] | 1031 | { |
---|
| 1032 | vpn_t vpn; // VPN of PTE to be set |
---|
| 1033 | vpn_t vpn_min; // VPN of first PTE to be set |
---|
| 1034 | vpn_t vpn_max; // VPN of last PTE to be set (excluded) |
---|
| 1035 | ppn_t ppn; // PPN of allocated physical page |
---|
| 1036 | uint32_t order; // ln( number of small pages for one single PTE ) |
---|
| 1037 | page_t * page; |
---|
| 1038 | error_t error; |
---|
| 1039 | |
---|
[68] | 1040 | // check vseg type : must be a kernel vseg |
---|
[1] | 1041 | uint32_t type = vseg->type; |
---|
[68] | 1042 | assert( ((type==VSEG_TYPE_KCODE) || (type==VSEG_TYPE_KDATA) || (type==VSEG_TYPE_KDEV)), |
---|
| 1043 | __FUNCTION__ , "not a kernel vseg\n" ); |
---|
[1] | 1044 | |
---|
| 1045 | // get pointer on page table |
---|
| 1046 | gpt_t * gpt = &process_zero.vmm.gpt; |
---|
| 1047 | |
---|
[21] | 1048 | // define number of small pages per PTE |
---|
[1] | 1049 | if( attr & GPT_SMALL ) order = 0; // 1 small page |
---|
| 1050 | else order = 9; // 512 small pages |
---|
| 1051 | |
---|
| 1052 | // loop on pages in vseg |
---|
| 1053 | vpn_min = vseg->vpn_base; |
---|
| 1054 | vpn_max = vpn_min + vseg->vpn_size; |
---|
| 1055 | for( vpn = vpn_min ; vpn < vpn_max ; vpn++ ) |
---|
| 1056 | { |
---|
[68] | 1057 | // allocate a physical page from local PPM |
---|
[1] | 1058 | kmem_req_t req; |
---|
| 1059 | req.type = KMEM_PAGE; |
---|
| 1060 | req.size = order; |
---|
| 1061 | req.flags = AF_KERNEL | AF_ZERO; |
---|
| 1062 | page = (page_t *)kmem_alloc( &req ); |
---|
[21] | 1063 | if( page == NULL ) |
---|
[1] | 1064 | { |
---|
| 1065 | printk("\n[ERROR] in %s : cannot allocate physical memory\n", __FUNCTION__ ); |
---|
| 1066 | return ENOMEM; |
---|
| 1067 | } |
---|
| 1068 | |
---|
| 1069 | // set page table entry |
---|
[315] | 1070 | ppn = ppm_page2ppn( XPTR( local_cxy , page ) ); |
---|
[408] | 1071 | error = hal_gpt_set_pte( gpt, |
---|
| 1072 | vpn, |
---|
| 1073 | attr, |
---|
| 1074 | ppn ); |
---|
[21] | 1075 | if( error ) |
---|
[1] | 1076 | { |
---|
| 1077 | printk("\n[ERROR] in %s : cannot register PPE\n", __FUNCTION__ ); |
---|
| 1078 | return ENOMEM; |
---|
| 1079 | } |
---|
| 1080 | } |
---|
[21] | 1081 | |
---|
[1] | 1082 | return 0; |
---|
| 1083 | |
---|
[408] | 1084 | } // end vmm_map_kernel_vseg() |
---|
| 1085 | |
---|
[1] | 1086 | ///////////////////////////////////////// |
---|
| 1087 | void vmm_unmap_vseg( process_t * process, |
---|
| 1088 | vseg_t * vseg ) |
---|
| 1089 | { |
---|
[21] | 1090 | vpn_t vpn; // VPN of current PTE |
---|
| 1091 | vpn_t vpn_min; // VPN of first PTE |
---|
[1] | 1092 | vpn_t vpn_max; // VPN of last PTE (excluded) |
---|
[409] | 1093 | ppn_t ppn; // current PTE ppn value |
---|
| 1094 | uint32_t attr; // current PTE attributes |
---|
| 1095 | kmem_req_t req; // request to release memory |
---|
| 1096 | xptr_t page_xp; // extended pointer on page descriptor |
---|
| 1097 | cxy_t page_cxy; // page descriptor cluster |
---|
| 1098 | page_t * page_ptr; // page descriptor pointer |
---|
[433] | 1099 | xptr_t forks_xp; // extended pointer on pending forks counter |
---|
| 1100 | uint32_t count; // actual number of pendinf forks |
---|
[1] | 1101 | |
---|
[433] | 1102 | #if CONFIG_DEBUG_VMM_UNMAP_VSEG |
---|
| 1103 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
---|
| 1104 | if( CONFIG_DEBUG_VMM_UNMAP_VSEG < cycle ) |
---|
| 1105 | printk("\n[DBG] %s : thread %x enter / process %x / vseg %s / base %x / cycle %d\n", |
---|
| 1106 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str( vseg->type ), vseg->vpn_base, cycle ); |
---|
| 1107 | #endif |
---|
[409] | 1108 | |
---|
[433] | 1109 | // get pointer on local GPT |
---|
[1] | 1110 | gpt_t * gpt = &process->vmm.gpt; |
---|
| 1111 | |
---|
| 1112 | // loop on pages in vseg |
---|
| 1113 | vpn_min = vseg->vpn_base; |
---|
| 1114 | vpn_max = vpn_min + vseg->vpn_size; |
---|
| 1115 | for( vpn = vpn_min ; vpn < vpn_max ; vpn++ ) |
---|
| 1116 | { |
---|
[409] | 1117 | // get GPT entry |
---|
| 1118 | hal_gpt_get_pte( gpt , vpn , &attr , &ppn ); |
---|
| 1119 | |
---|
| 1120 | if( attr & GPT_MAPPED ) // entry is mapped |
---|
| 1121 | { |
---|
| 1122 | // check small page |
---|
| 1123 | assert( (attr & GPT_SMALL) , __FUNCTION__ , |
---|
| 1124 | "an user vseg must use small pages" ); |
---|
| 1125 | |
---|
[433] | 1126 | // unmap GPT entry in all GPT copies |
---|
[409] | 1127 | hal_gpt_reset_pte( gpt , vpn ); |
---|
| 1128 | |
---|
[433] | 1129 | // handle pending forks counter if |
---|
| 1130 | // 1) not identity mapped |
---|
| 1131 | // 2) running in reference cluster |
---|
| 1132 | if( ((vseg->flags & VSEG_IDENT) == 0) && |
---|
| 1133 | (GET_CXY( process->ref_xp ) == local_cxy) ) |
---|
[409] | 1134 | { |
---|
[433] | 1135 | // get extended pointer on physical page descriptor |
---|
[409] | 1136 | page_xp = ppm_ppn2page( ppn ); |
---|
| 1137 | page_cxy = GET_CXY( page_xp ); |
---|
[433] | 1138 | page_ptr = GET_PTR( page_xp ); |
---|
[409] | 1139 | |
---|
[433] | 1140 | // FIXME lock the physical page |
---|
| 1141 | |
---|
| 1142 | // get extended pointer on pending forks counter |
---|
| 1143 | forks_xp = XPTR( page_cxy , &page_ptr->forks ); |
---|
| 1144 | |
---|
| 1145 | // get pending forks counter |
---|
| 1146 | count = hal_remote_lw( forks_xp ); |
---|
| 1147 | |
---|
| 1148 | if( count ) // decrement pending forks counter |
---|
[409] | 1149 | { |
---|
[433] | 1150 | hal_remote_atomic_add( forks_xp , -1 ); |
---|
| 1151 | } |
---|
| 1152 | else // release physical page to relevant cluster |
---|
[409] | 1153 | { |
---|
[433] | 1154 | if( page_cxy == local_cxy ) // local cluster |
---|
| 1155 | { |
---|
| 1156 | req.type = KMEM_PAGE; |
---|
| 1157 | req.ptr = page_ptr; |
---|
| 1158 | kmem_free( &req ); |
---|
| 1159 | } |
---|
| 1160 | else // remote cluster |
---|
| 1161 | { |
---|
| 1162 | rpc_pmem_release_pages_client( page_cxy , page_ptr ); |
---|
| 1163 | } |
---|
[409] | 1164 | } |
---|
[433] | 1165 | |
---|
| 1166 | // FIXME unlock the physical page |
---|
[409] | 1167 | } |
---|
| 1168 | } |
---|
[1] | 1169 | } |
---|
[433] | 1170 | |
---|
| 1171 | #if CONFIG_DEBUG_VMM_UNMAP_VSEG |
---|
| 1172 | cycle = (uint32_t)hal_get_cycles(); |
---|
| 1173 | if( CONFIG_DEBUG_VMM_UNMAP_VSEG < cycle ) |
---|
| 1174 | printk("\n[DBG] %s : thread %x exit / process %x / vseg %s / base %x / cycle %d\n", |
---|
| 1175 | __FUNCTION__, CURRENT_THREAD, process->pid, vseg_type_str( vseg->type ), vseg->vpn_base, cycle ); |
---|
| 1176 | #endif |
---|
| 1177 | |
---|
[409] | 1178 | } // end vmm_unmap_vseg() |
---|
[1] | 1179 | |
---|
[407] | 1180 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[406] | 1181 | // This low-level static function is called by the vmm_get_vseg() and vmm_resize_vseg() |
---|
| 1182 | // functions. It scan the list of registered vsegs to find the unique vseg containing |
---|
| 1183 | // a given virtual address. |
---|
[407] | 1184 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[406] | 1185 | // @ vmm : pointer on the process VMM. |
---|
| 1186 | // @ vaddr : virtual address. |
---|
| 1187 | // @ return vseg pointer if success / return NULL if not found. |
---|
[407] | 1188 | ////////////////////////////////////////////////////////////////////////////////////////// |
---|
[406] | 1189 | static vseg_t * vseg_from_vaddr( vmm_t * vmm, |
---|
| 1190 | intptr_t vaddr ) |
---|
| 1191 | { |
---|
[408] | 1192 | xptr_t iter_xp; |
---|
| 1193 | xptr_t vseg_xp; |
---|
| 1194 | vseg_t * vseg; |
---|
[406] | 1195 | |
---|
[408] | 1196 | // get extended pointers on VSL lock and root |
---|
| 1197 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
| 1198 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
---|
[406] | 1199 | |
---|
[408] | 1200 | // get lock protecting the VSL |
---|
| 1201 | remote_rwlock_rd_lock( lock_xp ); |
---|
| 1202 | |
---|
| 1203 | // scan the list of vsegs in VSL |
---|
| 1204 | XLIST_FOREACH( root_xp , iter_xp ) |
---|
[406] | 1205 | { |
---|
[408] | 1206 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
---|
[433] | 1207 | vseg = GET_PTR( vseg_xp ); |
---|
[408] | 1208 | if( (vaddr >= vseg->min) && (vaddr < vseg->max) ) |
---|
| 1209 | { |
---|
| 1210 | // return success |
---|
| 1211 | remote_rwlock_rd_unlock( lock_xp ); |
---|
| 1212 | return vseg; |
---|
| 1213 | } |
---|
[406] | 1214 | } |
---|
| 1215 | |
---|
[408] | 1216 | // return failure |
---|
| 1217 | remote_rwlock_rd_unlock( lock_xp ); |
---|
| 1218 | return NULL; |
---|
[406] | 1219 | |
---|
[408] | 1220 | } // end vseg_from_vaddr() |
---|
[406] | 1221 | |
---|
[1] | 1222 | ///////////////////////////////////////////// |
---|
| 1223 | error_t vmm_resize_vseg( process_t * process, |
---|
| 1224 | intptr_t base, |
---|
| 1225 | intptr_t size ) |
---|
| 1226 | { |
---|
[406] | 1227 | error_t error; |
---|
| 1228 | vseg_t * new; |
---|
| 1229 | vpn_t vpn_min; |
---|
| 1230 | vpn_t vpn_max; |
---|
[1] | 1231 | |
---|
| 1232 | // get pointer on process VMM |
---|
| 1233 | vmm_t * vmm = &process->vmm; |
---|
| 1234 | |
---|
| 1235 | intptr_t addr_min = base; |
---|
| 1236 | intptr_t addr_max = base + size; |
---|
| 1237 | |
---|
| 1238 | // get pointer on vseg |
---|
[406] | 1239 | vseg_t * vseg = vseg_from_vaddr( vmm , base ); |
---|
[1] | 1240 | |
---|
| 1241 | if( vseg == NULL) return EINVAL; |
---|
[21] | 1242 | |
---|
[408] | 1243 | // get extended pointer on VSL lock |
---|
| 1244 | xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock ); |
---|
[21] | 1245 | |
---|
[408] | 1246 | // get lock protecting VSL |
---|
| 1247 | remote_rwlock_wr_lock( lock_xp ); |
---|
| 1248 | |
---|
[1] | 1249 | if( (vseg->min > addr_min) || (vseg->max < addr_max) ) // region not included in vseg |
---|
| 1250 | { |
---|
| 1251 | error = EINVAL; |
---|
| 1252 | } |
---|
| 1253 | else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be removed |
---|
| 1254 | { |
---|
| 1255 | vmm_remove_vseg( vseg ); |
---|
| 1256 | error = 0; |
---|
| 1257 | } |
---|
[406] | 1258 | else if( vseg->min == addr_min ) // vseg must be resized |
---|
[1] | 1259 | { |
---|
[406] | 1260 | // update vseg base address |
---|
| 1261 | vseg->min = addr_max; |
---|
| 1262 | |
---|
| 1263 | // update vpn_base and vpn_size |
---|
| 1264 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1265 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1266 | vseg->vpn_base = vpn_min; |
---|
| 1267 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
| 1268 | error = 0; |
---|
[1] | 1269 | } |
---|
[406] | 1270 | else if( vseg->max == addr_max ) // vseg must be resized |
---|
[1] | 1271 | { |
---|
[406] | 1272 | // update vseg max address |
---|
| 1273 | vseg->max = addr_min; |
---|
| 1274 | |
---|
| 1275 | // update vpn_base and vpn_size |
---|
| 1276 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1277 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1278 | vseg->vpn_base = vpn_min; |
---|
| 1279 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
| 1280 | error = 0; |
---|
[1] | 1281 | } |
---|
[406] | 1282 | else // vseg cut in three regions |
---|
[1] | 1283 | { |
---|
[406] | 1284 | // resize existing vseg |
---|
| 1285 | vseg->max = addr_min; |
---|
| 1286 | |
---|
| 1287 | // update vpn_base and vpn_size |
---|
| 1288 | vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1289 | vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT; |
---|
| 1290 | vseg->vpn_base = vpn_min; |
---|
| 1291 | vseg->vpn_size = vpn_max - vpn_min + 1; |
---|
| 1292 | |
---|
| 1293 | // create new vseg |
---|
[407] | 1294 | new = vmm_create_vseg( process, |
---|
| 1295 | vseg->type, |
---|
| 1296 | addr_min, |
---|
| 1297 | (vseg->max - addr_max), |
---|
| 1298 | vseg->file_offset, |
---|
| 1299 | vseg->file_size, |
---|
| 1300 | vseg->mapper_xp, |
---|
| 1301 | vseg->cxy ); |
---|
| 1302 | |
---|
[406] | 1303 | if( new == NULL ) error = EINVAL; |
---|
| 1304 | else error = 0; |
---|
[1] | 1305 | } |
---|
| 1306 | |
---|
| 1307 | // release VMM lock |
---|
[408] | 1308 | remote_rwlock_wr_unlock( lock_xp ); |
---|
[1] | 1309 | |
---|
| 1310 | return error; |
---|
| 1311 | |
---|
[406] | 1312 | } // vmm_resize_vseg() |
---|
| 1313 | |
---|
[1] | 1314 | /////////////////////////////////////////// |
---|
[388] | 1315 | error_t vmm_get_vseg( process_t * process, |
---|
[394] | 1316 | intptr_t vaddr, |
---|
[388] | 1317 | vseg_t ** found_vseg ) |
---|
[1] | 1318 | { |
---|
[406] | 1319 | vmm_t * vmm = &process->vmm; |
---|
[1] | 1320 | |
---|
[406] | 1321 | // get vseg from vaddr |
---|
| 1322 | vseg_t * vseg = vseg_from_vaddr( vmm , vaddr ); |
---|
[1] | 1323 | |
---|
[388] | 1324 | if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref |
---|
| 1325 | { |
---|
| 1326 | // get extended pointer on reference process |
---|
| 1327 | xptr_t ref_xp = process->ref_xp; |
---|
[1] | 1328 | |
---|
[388] | 1329 | // get cluster and local pointer on reference process |
---|
| 1330 | cxy_t ref_cxy = GET_CXY( ref_xp ); |
---|
[433] | 1331 | process_t * ref_ptr = GET_PTR( ref_xp ); |
---|
[388] | 1332 | |
---|
| 1333 | if( local_cxy == ref_cxy ) return -1; // local cluster is the reference |
---|
| 1334 | |
---|
| 1335 | // get extended pointer on reference vseg |
---|
| 1336 | xptr_t vseg_xp; |
---|
| 1337 | error_t error; |
---|
[406] | 1338 | |
---|
[394] | 1339 | rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error ); |
---|
[388] | 1340 | |
---|
| 1341 | if( error ) return -1; // vseg not found => illegal user vaddr |
---|
| 1342 | |
---|
| 1343 | // allocate a vseg in local cluster |
---|
| 1344 | vseg = vseg_alloc(); |
---|
| 1345 | |
---|
[406] | 1346 | if( vseg == NULL ) return -1; |
---|
[388] | 1347 | |
---|
| 1348 | // initialise local vseg from reference |
---|
| 1349 | vseg_init_from_ref( vseg , vseg_xp ); |
---|
| 1350 | |
---|
| 1351 | // register local vseg in local VMM |
---|
[406] | 1352 | vseg_attach( &process->vmm , vseg ); |
---|
[388] | 1353 | } |
---|
| 1354 | |
---|
| 1355 | // success |
---|
| 1356 | *found_vseg = vseg; |
---|
[394] | 1357 | return 0; |
---|
[388] | 1358 | |
---|
| 1359 | } // end vmm_get_vseg() |
---|
| 1360 | |
---|
[407] | 1361 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1362 | // This static function compute the target cluster to allocate a physical page |
---|
| 1363 | // for a given <vpn> in a given <vseg>, allocates the page (with an RPC if required) |
---|
| 1364 | // and returns an extended pointer on the allocated page descriptor. |
---|
| 1365 | // The vseg cannot have the FILE type. |
---|
| 1366 | ////////////////////////////////////////////////////////////////////////////////////// |
---|
| 1367 | static xptr_t vmm_page_allocate( vseg_t * vseg, |
---|
| 1368 | vpn_t vpn ) |
---|
| 1369 | { |
---|
[433] | 1370 | |
---|
| 1371 | #if CONFIG_DEBUG_VMM_ALLOCATE_PAGE |
---|
| 1372 | if( CONFIG_DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() ) |
---|
| 1373 | printk("\n[DBG] in %s : thread %x enter for vpn %x\n", |
---|
| 1374 | __FUNCTION__ , CURRENT_THREAD, vpn ); |
---|
| 1375 | #endif |
---|
| 1376 | |
---|
[407] | 1377 | // compute target cluster |
---|
| 1378 | page_t * page_ptr; |
---|
| 1379 | cxy_t page_cxy; |
---|
| 1380 | kmem_req_t req; |
---|
| 1381 | |
---|
| 1382 | uint32_t type = vseg->type; |
---|
| 1383 | uint32_t flags = vseg->flags; |
---|
| 1384 | |
---|
| 1385 | assert( ( type != VSEG_TYPE_FILE ) , __FUNCTION__ , "illegal vseg type\n" ); |
---|
| 1386 | |
---|
| 1387 | if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB |
---|
| 1388 | { |
---|
| 1389 | uint32_t x_size = LOCAL_CLUSTER->x_size; |
---|
| 1390 | uint32_t y_size = LOCAL_CLUSTER->y_size; |
---|
| 1391 | uint32_t y_width = LOCAL_CLUSTER->y_width; |
---|
| 1392 | uint32_t index = vpn & ((x_size * y_size) - 1); |
---|
| 1393 | uint32_t x = index / y_size; |
---|
| 1394 | uint32_t y = index % y_size; |
---|
| 1395 | page_cxy = (x<<y_width) + y; |
---|
| 1396 | } |
---|
| 1397 | else // other cases => cxy specified in vseg |
---|
| 1398 | { |
---|
| 1399 | page_cxy = vseg->cxy; |
---|
| 1400 | } |
---|
| 1401 | |
---|
| 1402 | // allocate a physical page from target cluster |
---|
| 1403 | if( page_cxy == local_cxy ) // target cluster is the local cluster |
---|
| 1404 | { |
---|
| 1405 | req.type = KMEM_PAGE; |
---|
| 1406 | req.size = 0; |
---|
| 1407 | req.flags = AF_NONE; |
---|
| 1408 | page_ptr = (page_t *)kmem_alloc( &req ); |
---|
| 1409 | } |
---|
| 1410 | else // target cluster is not the local cluster |
---|
| 1411 | { |
---|
| 1412 | rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr ); |
---|
| 1413 | } |
---|
| 1414 | |
---|
[433] | 1415 | #if CONFIG_DEBUG_VMM_ALLOCATE_PAGE |
---|
| 1416 | if( CONFIG_DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() ) |
---|
| 1417 | printk("\n[DBG] in %s : thread %x exit for vpn = %d / ppn = %x\n", |
---|
| 1418 | __FUNCTION__ , CURRENT_THREAD, vpn, ppm_page2ppn( XPTR( page_cxy , page_ptr ) ) ); |
---|
| 1419 | #endif |
---|
| 1420 | |
---|
[407] | 1421 | if( page_ptr == NULL ) return XPTR_NULL; |
---|
| 1422 | else return XPTR( page_cxy , page_ptr ); |
---|
| 1423 | |
---|
| 1424 | } // end vmm_page_allocate() |
---|
| 1425 | |
---|
[313] | 1426 | //////////////////////////////////////// |
---|
| 1427 | error_t vmm_get_one_ppn( vseg_t * vseg, |
---|
| 1428 | vpn_t vpn, |
---|
| 1429 | ppn_t * ppn ) |
---|
| 1430 | { |
---|
| 1431 | error_t error; |
---|
[407] | 1432 | xptr_t page_xp; // extended pointer on physical page descriptor |
---|
[313] | 1433 | page_t * page_ptr; // local pointer on physical page descriptor |
---|
[406] | 1434 | uint32_t index; // missing page index in vseg mapper |
---|
| 1435 | uint32_t type; // vseg type; |
---|
[313] | 1436 | |
---|
[406] | 1437 | type = vseg->type; |
---|
| 1438 | index = vpn - vseg->vpn_base; |
---|
[313] | 1439 | |
---|
[433] | 1440 | #if CONFIG_DEBUG_VMM_GET_ONE_PPN |
---|
| 1441 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1442 | printk("\n[DBG] %s : thread %x enter for vpn = %x / type = %s / index = %d\n", |
---|
| 1443 | __FUNCTION__, CURRENT_THREAD, vpn, vseg_type_str(type), index ); |
---|
| 1444 | #endif |
---|
[313] | 1445 | |
---|
[406] | 1446 | // FILE type : get the physical page from the file mapper |
---|
[313] | 1447 | if( type == VSEG_TYPE_FILE ) |
---|
| 1448 | { |
---|
[406] | 1449 | // get extended pointer on mapper |
---|
[407] | 1450 | xptr_t mapper_xp = vseg->mapper_xp; |
---|
[313] | 1451 | |
---|
[406] | 1452 | assert( (mapper_xp != XPTR_NULL), __FUNCTION__, |
---|
| 1453 | "mapper not defined for a FILE vseg\n" ); |
---|
| 1454 | |
---|
| 1455 | // get mapper cluster and local pointer |
---|
| 1456 | cxy_t mapper_cxy = GET_CXY( mapper_xp ); |
---|
[433] | 1457 | mapper_t * mapper_ptr = GET_PTR( mapper_xp ); |
---|
[406] | 1458 | |
---|
[313] | 1459 | // get page descriptor from mapper |
---|
| 1460 | if( mapper_cxy == local_cxy ) // mapper is local |
---|
| 1461 | { |
---|
| 1462 | page_ptr = mapper_get_page( mapper_ptr , index ); |
---|
| 1463 | } |
---|
| 1464 | else // mapper is remote |
---|
| 1465 | { |
---|
| 1466 | rpc_mapper_get_page_client( mapper_cxy , mapper_ptr , index , &page_ptr ); |
---|
| 1467 | } |
---|
| 1468 | |
---|
| 1469 | if ( page_ptr == NULL ) return EINVAL; |
---|
| 1470 | |
---|
[407] | 1471 | page_xp = XPTR( mapper_cxy , page_ptr ); |
---|
[313] | 1472 | } |
---|
| 1473 | |
---|
[406] | 1474 | // Other types : allocate a physical page from target cluster, |
---|
[407] | 1475 | // as defined by vseg type and vpn value |
---|
[313] | 1476 | else |
---|
| 1477 | { |
---|
[433] | 1478 | // allocate one physical page |
---|
[407] | 1479 | page_xp = vmm_page_allocate( vseg , vpn ); |
---|
[406] | 1480 | |
---|
[407] | 1481 | if( page_xp == XPTR_NULL ) return ENOMEM; |
---|
[313] | 1482 | |
---|
[406] | 1483 | // initialise missing page from .elf file mapper for DATA and CODE types |
---|
[433] | 1484 | // (the vseg->mapper_xp field is an extended pointer on the .elf file mapper) |
---|
[313] | 1485 | if( (type == VSEG_TYPE_CODE) || (type == VSEG_TYPE_DATA) ) |
---|
| 1486 | { |
---|
[406] | 1487 | // get extended pointer on mapper |
---|
| 1488 | xptr_t mapper_xp = vseg->mapper_xp; |
---|
[313] | 1489 | |
---|
[406] | 1490 | assert( (mapper_xp != XPTR_NULL), __FUNCTION__, |
---|
| 1491 | "mapper not defined for a CODE or DATA vseg\n" ); |
---|
| 1492 | |
---|
| 1493 | // get mapper cluster and local pointer |
---|
| 1494 | cxy_t mapper_cxy = GET_CXY( mapper_xp ); |
---|
[433] | 1495 | mapper_t * mapper_ptr = GET_PTR( mapper_xp ); |
---|
[406] | 1496 | |
---|
| 1497 | // compute missing page offset in vseg |
---|
| 1498 | uint32_t offset = index << CONFIG_PPM_PAGE_SHIFT; |
---|
| 1499 | |
---|
[313] | 1500 | // compute missing page offset in .elf file |
---|
[406] | 1501 | uint32_t elf_offset = vseg->file_offset + offset; |
---|
[313] | 1502 | |
---|
[433] | 1503 | #if (CONFIG_DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
| 1504 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1505 | printk("\n[DBG] %s : thread %x for vpn = %x / elf_offset = %x\n", |
---|
| 1506 | __FUNCTION__, CURRENT_THREAD, vpn, elf_offset ); |
---|
| 1507 | #endif |
---|
[313] | 1508 | |
---|
[406] | 1509 | // compute extended pointer on page base |
---|
[407] | 1510 | xptr_t base_xp = ppm_page2base( page_xp ); |
---|
[313] | 1511 | |
---|
[406] | 1512 | // file_size (in .elf mapper) can be smaller than vseg_size (BSS) |
---|
| 1513 | uint32_t file_size = vseg->file_size; |
---|
| 1514 | |
---|
| 1515 | if( file_size < offset ) // missing page fully in BSS |
---|
[313] | 1516 | { |
---|
[406] | 1517 | |
---|
[433] | 1518 | #if (CONFIG_DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
| 1519 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1520 | printk("\n[DBG] %s : thread%x for vpn = %x / fully in BSS\n", |
---|
| 1521 | __FUNCTION__, CURRENT_THREAD, vpn ); |
---|
| 1522 | #endif |
---|
| 1523 | |
---|
[407] | 1524 | if( GET_CXY( page_xp ) == local_cxy ) |
---|
[313] | 1525 | { |
---|
[315] | 1526 | memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE ); |
---|
[313] | 1527 | } |
---|
| 1528 | else |
---|
| 1529 | { |
---|
[315] | 1530 | hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE ); |
---|
[313] | 1531 | } |
---|
| 1532 | } |
---|
[406] | 1533 | else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper |
---|
[315] | 1534 | { |
---|
[406] | 1535 | |
---|
[433] | 1536 | #if (CONFIG_DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
| 1537 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1538 | printk("\n[DBG] %s : thread %x, for vpn = %x / fully in mapper\n", |
---|
| 1539 | __FUNCTION__, CURRENT_THREAD, vpn ); |
---|
| 1540 | #endif |
---|
[407] | 1541 | |
---|
[313] | 1542 | if( mapper_cxy == local_cxy ) |
---|
| 1543 | { |
---|
| 1544 | error = mapper_move_kernel( mapper_ptr, |
---|
| 1545 | true, // to_buffer |
---|
[406] | 1546 | elf_offset, |
---|
[313] | 1547 | base_xp, |
---|
[315] | 1548 | CONFIG_PPM_PAGE_SIZE ); |
---|
[313] | 1549 | } |
---|
| 1550 | else |
---|
| 1551 | { |
---|
| 1552 | rpc_mapper_move_buffer_client( mapper_cxy, |
---|
| 1553 | mapper_ptr, |
---|
| 1554 | true, // to buffer |
---|
| 1555 | false, // kernel buffer |
---|
[406] | 1556 | elf_offset, |
---|
| 1557 | base_xp, |
---|
[315] | 1558 | CONFIG_PPM_PAGE_SIZE, |
---|
[313] | 1559 | &error ); |
---|
| 1560 | } |
---|
| 1561 | if( error ) return EINVAL; |
---|
| 1562 | } |
---|
[406] | 1563 | else // both in mapper and in BSS : |
---|
| 1564 | // - (file_size - offset) bytes from mapper |
---|
| 1565 | // - (page_size + offset - file_size) bytes from BSS |
---|
[313] | 1566 | { |
---|
[406] | 1567 | |
---|
[433] | 1568 | #if (CONFIG_DEBUG_VMM_GET_ONE_PPN & 0x1) |
---|
| 1569 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1570 | printk("\n[DBG] %s : thread %x for vpn = %x / both mapper & BSS\n" |
---|
| 1571 | " %d bytes from mapper / %d bytes from BSS\n", |
---|
| 1572 | __FUNCTION__, CURRENT_THREAD, vpn, |
---|
[407] | 1573 | file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
[433] | 1574 | #endif |
---|
[313] | 1575 | // initialize mapper part |
---|
[315] | 1576 | if( mapper_cxy == local_cxy ) |
---|
[313] | 1577 | { |
---|
| 1578 | error = mapper_move_kernel( mapper_ptr, |
---|
[315] | 1579 | true, // to buffer |
---|
[406] | 1580 | elf_offset, |
---|
[313] | 1581 | base_xp, |
---|
[406] | 1582 | file_size - offset ); |
---|
[313] | 1583 | } |
---|
[315] | 1584 | else |
---|
[313] | 1585 | { |
---|
| 1586 | rpc_mapper_move_buffer_client( mapper_cxy, |
---|
| 1587 | mapper_ptr, |
---|
[315] | 1588 | true, // to buffer |
---|
[313] | 1589 | false, // kernel buffer |
---|
[406] | 1590 | elf_offset, |
---|
| 1591 | base_xp, |
---|
| 1592 | file_size - offset, |
---|
[313] | 1593 | &error ); |
---|
| 1594 | } |
---|
| 1595 | if( error ) return EINVAL; |
---|
| 1596 | |
---|
| 1597 | // initialize BSS part |
---|
[407] | 1598 | if( GET_CXY( page_xp ) == local_cxy ) |
---|
[313] | 1599 | { |
---|
[406] | 1600 | memset( GET_PTR( base_xp ) + file_size - offset , 0 , |
---|
| 1601 | offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
[313] | 1602 | } |
---|
| 1603 | else |
---|
| 1604 | { |
---|
[406] | 1605 | hal_remote_memset( base_xp + file_size - offset , 0 , |
---|
| 1606 | offset + CONFIG_PPM_PAGE_SIZE - file_size ); |
---|
[313] | 1607 | } |
---|
| 1608 | } |
---|
| 1609 | } // end initialisation for CODE or DATA types |
---|
| 1610 | } |
---|
| 1611 | |
---|
| 1612 | // return ppn |
---|
[407] | 1613 | *ppn = ppm_page2ppn( page_xp ); |
---|
[406] | 1614 | |
---|
[433] | 1615 | #if CONFIG_DEBUG_VMM_GET_ONE_PPN |
---|
| 1616 | if( CONFIG_DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() ) |
---|
| 1617 | printk("\n[DBG] %s : thread %x exit for vpn = %x / ppn = %x\n", |
---|
| 1618 | __FUNCTION__ , CURRENT_THREAD , vpn , *ppn ); |
---|
| 1619 | #endif |
---|
[406] | 1620 | |
---|
[313] | 1621 | return 0; |
---|
| 1622 | |
---|
| 1623 | } // end vmm_get_one_ppn() |
---|
| 1624 | |
---|
[1] | 1625 | ///////////////////////////////////////// |
---|
| 1626 | error_t vmm_get_pte( process_t * process, |
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| 1627 | vpn_t vpn, |
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[407] | 1628 | bool_t cow, |
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| 1629 | uint32_t * attr, |
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| 1630 | ppn_t * ppn ) |
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[1] | 1631 | { |
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[433] | 1632 | vseg_t * vseg; // vseg containing VPN |
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[407] | 1633 | ppn_t old_ppn; // current PTE_PPN |
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| 1634 | uint32_t old_attr; // current PTE_ATTR |
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| 1635 | ppn_t new_ppn; // new PTE_PPN |
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| 1636 | uint32_t new_attr; // new PTE_ATTR |
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[1] | 1637 | error_t error; |
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| 1638 | |
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[178] | 1639 | // this function must be called by a thread running in the reference cluster |
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[68] | 1640 | assert( (GET_CXY( process->ref_xp ) == local_cxy ) , __FUNCTION__ , |
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[406] | 1641 | "not called in the reference cluster\n" ); |
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[1] | 1642 | |
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[433] | 1643 | #if CONFIG_DEBUG_VMM_GET_PTE |
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| 1644 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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| 1645 | if( CONFIG_DEBUG_VMM_GET_PTE > cycle ) |
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| 1646 | printk("\n[DBG] %s : thread %x enter for vpn = %x / process %x / cow = %d / cycle %d\n", |
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| 1647 | __FUNCTION__ , CURRENT_THREAD , vpn , process->pid , cow , cycle ); |
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| 1648 | #endif |
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[406] | 1649 | |
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[1] | 1650 | // get VMM pointer |
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| 1651 | vmm_t * vmm = &process->vmm; |
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| 1652 | |
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[433] | 1653 | // get vseg pointer from reference VSL |
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[407] | 1654 | error = vmm_get_vseg( process , vpn<<CONFIG_PPM_PAGE_SHIFT , &vseg ); |
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[1] | 1655 | |
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[407] | 1656 | if( error ) |
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[1] | 1657 | { |
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[407] | 1658 | printk("\n[ERROR] in %s : out of segment / process = %x / vpn = %x\n", |
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| 1659 | __FUNCTION__ , process->pid , vpn ); |
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| 1660 | return error; |
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| 1661 | } |
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[406] | 1662 | |
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[433] | 1663 | #if CONFIG_DEBUG_VMM_GET_PTE |
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| 1664 | cycle = (uint32_t)hal_get_cycles(); |
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| 1665 | if( CONFIG_DEBUG_VMM_GET_PTE < cycle ) |
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| 1666 | printk("\n[DBG] %s : thread %x found vseg %s / vpn_base = %x / vpn_size = %x\n", |
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| 1667 | __FUNCTION__, CURRENT_THREAD, vseg_type_str(vseg->type), vseg->vpn_base, vseg->vpn_size ); |
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| 1668 | #endif |
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[1] | 1669 | |
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[407] | 1670 | // access GPT to get current PTE attributes and PPN |
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| 1671 | hal_gpt_get_pte( &vmm->gpt , vpn , &old_attr , &old_ppn ); |
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| 1672 | |
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[408] | 1673 | // for both "copy_on_write" and "page_fault" events, allocate a physical page, |
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| 1674 | // initialize it, register it in the reference GPT, update GPT copies in all |
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| 1675 | // clusters containing a copy, and return the new_ppn and new_attr |
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[407] | 1676 | |
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[433] | 1677 | if( cow ) /////////////////////////// copy_on_write request ////////////////////// |
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[407] | 1678 | { |
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[408] | 1679 | assert( (old_attr & GPT_MAPPED) , __FUNCTION__ , |
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| 1680 | "PTE must be mapped for a copy-on-write exception\n" ); |
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[407] | 1681 | |
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[433] | 1682 | #if CONFIG_DEBUG_VMM_GET_PTE |
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| 1683 | cycle = (uint32_t)hal_get_cycles(); |
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| 1684 | if( CONFIG_DEBUG_VMM_GET_PTE < cycle ) |
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| 1685 | printk("\n[DBG] %s : thread %x handling COW for vpn %x in process %x\n", |
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| 1686 | __FUNCTION__, CURRENT_THREAD, vpn, process->pid ); |
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| 1687 | #endif |
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[407] | 1688 | |
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[433] | 1689 | // get extended pointer, cluster and local pointer on physical page descriptor |
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[408] | 1690 | xptr_t page_xp = ppm_ppn2page( old_ppn ); |
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| 1691 | cxy_t page_cxy = GET_CXY( page_xp ); |
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[433] | 1692 | page_t * page_ptr = GET_PTR( page_xp ); |
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[407] | 1693 | |
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[408] | 1694 | // get number of pending forks in page descriptor |
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[433] | 1695 | uint32_t forks = hal_remote_lw( XPTR( page_cxy , &page_ptr->forks ) ); |
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[408] | 1696 | |
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[433] | 1697 | if( forks ) // pending fork => allocate a new page, copy old to new |
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[1] | 1698 | { |
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[408] | 1699 | // allocate a new physical page |
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| 1700 | page_xp = vmm_page_allocate( vseg , vpn ); |
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| 1701 | if( page_xp == XPTR_NULL ) |
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| 1702 | { |
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| 1703 | printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n", |
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| 1704 | __FUNCTION__ , process->pid , vpn ); |
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| 1705 | return -1; |
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| 1706 | } |
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[1] | 1707 | |
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[408] | 1708 | // compute allocated page PPN |
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| 1709 | new_ppn = ppm_page2ppn( page_xp ); |
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[406] | 1710 | |
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[408] | 1711 | // copy old page content to new page |
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| 1712 | xptr_t old_base_xp = ppm_ppn2base( old_ppn ); |
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| 1713 | xptr_t new_base_xp = ppm_ppn2base( new_ppn ); |
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| 1714 | memcpy( GET_PTR( new_base_xp ), |
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| 1715 | GET_PTR( old_base_xp ), |
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| 1716 | CONFIG_PPM_PAGE_SIZE ); |
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| 1717 | } |
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| 1718 | else // no pending fork => keep the existing page, reset COW |
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| 1719 | { |
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| 1720 | new_ppn = old_ppn; |
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| 1721 | } |
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[1] | 1722 | |
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[408] | 1723 | // build new_attr : reset COW and set WRITABLE, |
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| 1724 | new_attr = (old_attr | GPT_WRITABLE) & (~GPT_COW); |
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[407] | 1725 | |
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[408] | 1726 | // update GPT[vpn] for all GPT copies |
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[433] | 1727 | vmm_global_update_pte( process, vpn, new_attr, new_ppn ); |
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[407] | 1728 | |
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[433] | 1729 | // decrement pending forks counter in page descriptor |
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| 1730 | hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->forks ) , -1 ); |
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[407] | 1731 | } |
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[433] | 1732 | else ////////////////////////////////// page_fault request //////////////////////// |
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[407] | 1733 | { |
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[408] | 1734 | if( (old_attr & GPT_MAPPED) == 0 ) // true page_fault => map it |
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[407] | 1735 | { |
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[1] | 1736 | |
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[433] | 1737 | #if CONFIG_DEBUG_VMM_GET_PTE |
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| 1738 | cycle = (uint32_t)hal_get_cycles(); |
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| 1739 | if( CONFIG_DEBUG_VMM_GET_PTE < cycle ) |
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| 1740 | printk("\n[DBG] %s : thread %x handling page fault for vpn %x in process %x\n", |
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| 1741 | __FUNCTION__, CURRENT_THREAD, vpn, process->pid ); |
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| 1742 | #endif |
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[1] | 1743 | |
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[408] | 1744 | // allocate new_ppn, depending on vseg type |
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[407] | 1745 | error = vmm_get_one_ppn( vseg , vpn , &new_ppn ); |
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| 1746 | if( error ) |
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| 1747 | { |
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| 1748 | printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n", |
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| 1749 | __FUNCTION__ , process->pid , vpn ); |
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[408] | 1750 | return -1; |
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[407] | 1751 | } |
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| 1752 | |
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[408] | 1753 | // define new_attr from vseg flags |
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[407] | 1754 | new_attr = GPT_MAPPED | GPT_SMALL; |
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| 1755 | if( vseg->flags & VSEG_USER ) new_attr |= GPT_USER; |
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| 1756 | if( vseg->flags & VSEG_WRITE ) new_attr |= GPT_WRITABLE; |
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| 1757 | if( vseg->flags & VSEG_EXEC ) new_attr |= GPT_EXECUTABLE; |
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| 1758 | if( vseg->flags & VSEG_CACHE ) new_attr |= GPT_CACHABLE; |
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| 1759 | |
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[408] | 1760 | // register new PTE in reference GPT |
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| 1761 | // on demand policy => no update of GPT copies |
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| 1762 | error = hal_gpt_set_pte( &vmm->gpt, |
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| 1763 | vpn, |
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| 1764 | new_attr, |
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| 1765 | new_ppn ); |
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[407] | 1766 | if( error ) |
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| 1767 | { |
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| 1768 | printk("\n[ERROR] in %s : cannot update GPT / process = %x / vpn = %x\n", |
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| 1769 | __FUNCTION__ , process->pid , vpn ); |
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[408] | 1770 | return -1; |
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[407] | 1771 | } |
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| 1772 | } |
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[408] | 1773 | else // mapped in reference GPT => get it |
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[1] | 1774 | { |
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[408] | 1775 | new_ppn = old_ppn; |
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[407] | 1776 | new_attr = old_attr; |
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[1] | 1777 | } |
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[407] | 1778 | } |
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[1] | 1779 | |
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[433] | 1780 | #if CONFIG_DEBUG_VMM_GET_PTE |
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| 1781 | cycle = (uint32_t)hal_get_cycles(); |
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| 1782 | if( CONFIG_DEBUG_VMM_GET_PTE < cycle ) |
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| 1783 | printk("\n[DBG] %s : thread,%x exit for vpn %x in process %x / ppn = %x / attr = %x / cycle %d\n", |
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| 1784 | __FUNCTION__, CURRENT_THREAD, vpn, process->pid, new_ppn, new_attr, cycle ); |
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| 1785 | #endif |
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[406] | 1786 | |
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[433] | 1787 | // return success |
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[407] | 1788 | *ppn = new_ppn; |
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| 1789 | *attr = new_attr; |
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[1] | 1790 | return 0; |
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| 1791 | |
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[313] | 1792 | } // end vmm_get_pte() |
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| 1793 | |
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[1] | 1794 | /////////////////////////////////////////////////// |
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| 1795 | error_t vmm_handle_page_fault( process_t * process, |
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| 1796 | vpn_t vpn ) |
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| 1797 | { |
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| 1798 | uint32_t attr; // missing page attributes |
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[21] | 1799 | ppn_t ppn; // missing page PPN |
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[407] | 1800 | error_t error; |
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[1] | 1801 | |
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| 1802 | // get reference process cluster and local pointer |
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| 1803 | cxy_t ref_cxy = GET_CXY( process->ref_xp ); |
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[433] | 1804 | process_t * ref_ptr = GET_PTR( process->ref_xp ); |
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[1] | 1805 | |
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[313] | 1806 | // get missing PTE attributes and PPN from reference cluster |
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[407] | 1807 | if( local_cxy != ref_cxy ) |
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[1] | 1808 | { |
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[407] | 1809 | rpc_vmm_get_pte_client( ref_cxy, |
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| 1810 | ref_ptr, |
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| 1811 | vpn, |
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| 1812 | false, // page_fault |
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| 1813 | &attr, |
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| 1814 | &ppn, |
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| 1815 | &error ); |
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| 1816 | |
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| 1817 | // get local VMM pointer |
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| 1818 | vmm_t * vmm = &process->vmm; |
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| 1819 | |
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| 1820 | // update local GPT |
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[408] | 1821 | error |= hal_gpt_set_pte( &vmm->gpt, |
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| 1822 | vpn, |
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| 1823 | attr, |
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| 1824 | ppn ); |
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[1] | 1825 | } |
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[407] | 1826 | else // local cluster is the reference cluster |
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[1] | 1827 | { |
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[407] | 1828 | error = vmm_get_pte( process, |
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| 1829 | vpn, |
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| 1830 | false, // page-fault |
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| 1831 | &attr, |
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| 1832 | &ppn ); |
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[1] | 1833 | } |
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| 1834 | |
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[388] | 1835 | return error; |
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[1] | 1836 | |
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[313] | 1837 | } // end vmm_handle_page_fault() |
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| 1838 | |
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[408] | 1839 | //////////////////////////////////////////// |
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| 1840 | error_t vmm_handle_cow( process_t * process, |
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| 1841 | vpn_t vpn ) |
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[407] | 1842 | { |
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[433] | 1843 | uint32_t attr; // page attributes |
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| 1844 | ppn_t ppn; // page PPN |
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[407] | 1845 | error_t error; |
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[313] | 1846 | |
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[433] | 1847 | |
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[407] | 1848 | // get reference process cluster and local pointer |
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| 1849 | cxy_t ref_cxy = GET_CXY( process->ref_xp ); |
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[433] | 1850 | process_t * ref_ptr = GET_PTR( process->ref_xp ); |
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[407] | 1851 | |
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| 1852 | // get new PTE attributes and PPN from reference cluster |
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| 1853 | if( local_cxy != ref_cxy ) |
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| 1854 | { |
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| 1855 | rpc_vmm_get_pte_client( ref_cxy, |
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| 1856 | ref_ptr, |
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| 1857 | vpn, |
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| 1858 | true, // copy-on-write |
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| 1859 | &attr, |
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| 1860 | &ppn, |
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| 1861 | &error ); |
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| 1862 | |
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| 1863 | // get local VMM pointer |
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| 1864 | vmm_t * vmm = &process->vmm; |
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| 1865 | |
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| 1866 | // update local GPT |
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[408] | 1867 | error |= hal_gpt_set_pte( &vmm->gpt, |
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| 1868 | vpn, |
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| 1869 | attr, |
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| 1870 | ppn ); |
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[407] | 1871 | } |
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| 1872 | else // local cluster is the reference cluster |
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| 1873 | { |
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| 1874 | error = vmm_get_pte( process, |
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| 1875 | vpn, |
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| 1876 | true, // copy-on-write |
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| 1877 | &attr, |
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| 1878 | &ppn ); |
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| 1879 | } |
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| 1880 | |
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| 1881 | return error; |
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| 1882 | |
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[408] | 1883 | } // end vmm_handle_cow() |
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[407] | 1884 | |
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[1] | 1885 | /////////////////////////////////////////// |
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| 1886 | error_t vmm_v2p_translate( bool_t ident, |
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| 1887 | void * ptr, |
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| 1888 | paddr_t * paddr ) |
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| 1889 | { |
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[23] | 1890 | process_t * process = CURRENT_THREAD->process; |
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[1] | 1891 | |
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| 1892 | if( ident ) // identity mapping |
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| 1893 | { |
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[23] | 1894 | *paddr = (paddr_t)PADDR( local_cxy , (lpa_t)ptr ); |
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[1] | 1895 | return 0; |
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| 1896 | } |
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| 1897 | |
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[21] | 1898 | // access page table |
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[1] | 1899 | error_t error; |
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| 1900 | vpn_t vpn; |
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| 1901 | uint32_t attr; |
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| 1902 | ppn_t ppn; |
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| 1903 | uint32_t offset; |
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| 1904 | |
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[23] | 1905 | vpn = (vpn_t)( (intptr_t)ptr >> CONFIG_PPM_PAGE_SHIFT ); |
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| 1906 | offset = (uint32_t)( ((intptr_t)ptr) & CONFIG_PPM_PAGE_MASK ); |
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[1] | 1907 | |
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[50] | 1908 | if( local_cxy == GET_CXY( process->ref_xp) ) // calling process is reference process |
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[1] | 1909 | { |
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[407] | 1910 | error = vmm_get_pte( process, vpn , false , &attr , &ppn ); |
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[1] | 1911 | } |
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[50] | 1912 | else // calling process is not reference process |
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[1] | 1913 | { |
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| 1914 | cxy_t ref_cxy = GET_CXY( process->ref_xp ); |
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[433] | 1915 | process_t * ref_ptr = GET_PTR( process->ref_xp ); |
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[407] | 1916 | rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , false , &attr , &ppn , &error ); |
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[1] | 1917 | } |
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| 1918 | |
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[23] | 1919 | // set paddr |
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[1] | 1920 | *paddr = (((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT) | offset; |
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[21] | 1921 | |
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[23] | 1922 | return error; |
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[313] | 1923 | |
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[315] | 1924 | } // end vmm_v2p_translate() |
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[1] | 1925 | |
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[315] | 1926 | |
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