| 1 | /* |
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| 2 | * hal_vmm.c - Generic Virtual Memory Manager Initialisation for TSAR |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2016,2017) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <kernel_config.h> |
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| 25 | #include <hal_types.h> |
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| 26 | #include <hal_vmm.h> |
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| 27 | #include <hal_gpt.h> |
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| 28 | #include <vseg.h> |
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| 29 | #include <xlist.h> |
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| 30 | #include <vmm.h> |
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| 31 | #include <remote_rwlock.h> |
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| 32 | |
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| 33 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 34 | // This file contains the TSAR specific code for the Virtual Memory Manager. |
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| 35 | // |
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| 36 | // The "kentry" vseg contains the kernel code executed when a core enter/exit the kernel, |
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| 37 | // in case of Interrupt, Exception, or Syscall. |
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| 38 | // For the TSAR architecture, the kernel uses physical addresses, and this code must be |
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| 39 | // identity mapped. The following function is called by the generic vmm_init() function |
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| 40 | // and identity map all pages of the "kentry" vseg. |
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| 41 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 42 | |
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| 43 | //////////////////////////////////// |
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| 44 | error_t hal_vmm_init( vmm_t * vmm ) |
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| 45 | { |
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| 46 | error_t error; |
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| 47 | |
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| 48 | // get pointer on GPT |
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| 49 | gpt_t * gpt = &vmm->gpt; |
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| 50 | |
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| 51 | // map all pages of "kentry" vseg |
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| 52 | uint32_t vpn; |
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| 53 | uint32_t attr; |
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| 54 | attr = GPT_MAPPED | GPT_SMALL | GPT_EXECUTABLE | GPT_CACHABLE | GPT_GLOBAL; |
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| 55 | for( vpn = CONFIG_VMM_KENTRY_BASE; |
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| 56 | vpn < (CONFIG_VMM_KENTRY_BASE + CONFIG_VMM_KENTRY_SIZE); vpn++ ) |
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| 57 | { |
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| 58 | error = hal_gpt_set_pte( gpt, |
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| 59 | vpn, |
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| 60 | attr, |
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| 61 | (local_cxy<<20) | (vpn & 0xFFFFF) ); |
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| 62 | |
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| 63 | if( error ) return error; |
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| 64 | } |
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| 65 | |
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| 66 | // get lock protecting the VSL to found the "kentry" vseg |
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| 67 | remote_rwlock_wr_lock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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| 68 | |
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| 69 | // scan the VSL |
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| 70 | xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root ); |
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| 71 | xptr_t iter_xp; |
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| 72 | xptr_t vseg_xp; |
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| 73 | vseg_t * vseg; |
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| 74 | bool_t found = false; |
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| 75 | XLIST_FOREACH( root_xp , iter_xp ) |
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| 76 | { |
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| 77 | vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist ); |
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| 78 | vseg = (vseg_t *)GET_PTR( vseg_xp ); |
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| 79 | |
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| 80 | // set the IDENT flag in "kentry" vseg descriptor |
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| 81 | if( vseg->vpn_base == CONFIG_VMM_KENTRY_BASE ) |
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| 82 | { |
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| 83 | vseg->flags |= VSEG_IDENT; |
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| 84 | found = true; |
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| 85 | break; |
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| 86 | } |
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| 87 | } |
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| 88 | |
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| 89 | // release the lock protecting the VSL |
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| 90 | remote_rwlock_wr_unlock( XPTR( local_cxy , &vmm->vsegs_lock ) ); |
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| 91 | |
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| 92 | if( found == false ) return error; |
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| 93 | |
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| 94 | return 0; |
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| 95 | |
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| 96 | } // end hal_vmm_init() |
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| 97 | |
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| 98 | |
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