[1] | 1 | /* |
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| 2 | * sys_sem.c - Acces a POSIX unamed semaphore. |
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| 3 | * |
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[624] | 4 | * Authors Alain Greiner (2016,2017,2018,2019) |
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[1] | 5 | * |
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[23] | 6 | * Copyright (c) UPMC Sorbonne Universites |
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[1] | 7 | * |
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[23] | 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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[1] | 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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[23] | 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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[1] | 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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[23] | 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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[1] | 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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[457] | 24 | #include <hal_kernel_types.h> |
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[23] | 25 | #include <hal_uspace.h> |
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[624] | 26 | #include <hal_vmm.h> |
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[457] | 27 | #include <shared_semaphore.h> |
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[23] | 28 | #include <errno.h> |
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| 29 | #include <thread.h> |
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| 30 | #include <printk.h> |
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| 31 | #include <vmm.h> |
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[1] | 32 | #include <remote_sem.h> |
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[23] | 33 | #include <syscalls.h> |
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[1] | 34 | |
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[457] | 35 | #if DEBUG_SYS_SEM |
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| 36 | ////////////////////////////////////////////////// |
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| 37 | static char * sys_sem_op_str( uint32_t operation ) |
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| 38 | { |
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| 39 | if ( operation == SEM_INIT ) return "INIT"; |
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| 40 | else if( operation == SEM_WAIT ) return "WAIT"; |
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| 41 | else if( operation == SEM_POST ) return "POST"; |
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| 42 | else if( operation == SEM_GETVALUE ) return "GETVALUE"; |
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| 43 | else if( operation == SEM_DESTROY ) return "DESTROY"; |
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| 44 | else return "undefined"; |
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| 45 | } |
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| 46 | #endif |
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| 47 | |
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[1] | 48 | ////////////////////////////////// |
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[457] | 49 | int sys_sem( void * vaddr, // semaphore virtual address |
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| 50 | uint32_t operation, // requested operation type |
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| 51 | uint32_t init_value, // initial value |
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| 52 | uint32_t * current_value ) // pointer on current value buffer |
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[1] | 53 | { |
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[566] | 54 | vseg_t * vseg; // for vaddr check |
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[440] | 55 | error_t error; |
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[1] | 56 | |
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[440] | 57 | thread_t * this = CURRENT_THREAD; |
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| 58 | process_t * process = this->process; |
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[1] | 59 | |
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[457] | 60 | #if DEBUG_SYS_SEM |
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| 61 | uint64_t tm_start; |
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| 62 | uint64_t tm_end; |
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| 63 | tm_start = hal_get_cycles(); |
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| 64 | if( DEBUG_SYS_SEM < tm_start ) |
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| 65 | printk("\n[DBG] %s : thread %x in process %x enter for %s / cycle %d\n", |
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| 66 | __FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ), (uint32_t)tm_start ); |
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| 67 | #endif |
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| 68 | |
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[1] | 69 | // check vaddr in user vspace |
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[440] | 70 | error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg ); |
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[23] | 71 | if( error ) |
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[1] | 72 | { |
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[440] | 73 | |
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| 74 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 75 | printk("\n[ERROR] in %s : unmapped semaphore pointer %x / thread %x in process %x / cycle %d\n", |
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| 76 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[624] | 77 | hal_vmm_display( process , false ); |
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[440] | 78 | #endif |
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| 79 | this->errno = EINVAL; |
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[1] | 80 | return -1; |
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| 81 | } |
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| 82 | |
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| 83 | // execute requested operation |
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| 84 | switch( operation ) |
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| 85 | { |
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| 86 | ////////////// |
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| 87 | case SEM_INIT: |
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| 88 | { |
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[457] | 89 | // call relevant kernel function to initialize semaphore |
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| 90 | error = remote_sem_create( (intptr_t)vaddr , |
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[566] | 91 | init_value ); |
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[1] | 92 | if ( error ) |
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| 93 | { |
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[457] | 94 | |
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| 95 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 96 | printk("\n[ERROR] in %s INIT: cannot create semaphore / thread %x in process %x / cycle %d\n", |
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| 97 | __FUNCTION__, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[457] | 98 | #endif |
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| 99 | this->errno = ENOMEM; |
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[1] | 100 | return -1; |
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| 101 | } |
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| 102 | } |
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[566] | 103 | break; |
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[1] | 104 | ////////////////// |
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| 105 | case SEM_GETVALUE: |
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| 106 | { |
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[457] | 107 | // check current_value buffer in user vspace |
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| 108 | error = vmm_get_vseg( process , (intptr_t)current_value , &vseg ); |
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| 109 | if( error ) |
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| 110 | { |
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| 111 | |
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| 112 | #if DEBUG_SYSCALLS_ERROR |
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[566] | 113 | printk("\n[ERROR] in %s GETVALUE: unmapped buffer %x / thread %x in process %x / cycle %d\n", |
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[469] | 114 | __FUNCTION__ , (intptr_t)current_value, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[624] | 115 | hal_vmm_display( process , false ); |
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[457] | 116 | #endif |
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| 117 | this->errno = EINVAL; |
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| 118 | return -1; |
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| 119 | } |
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| 120 | |
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[1] | 121 | // get extended pointer on remote semaphore |
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[566] | 122 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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[1] | 123 | |
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[457] | 124 | // check semaphore registered |
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| 125 | if( sem_xp == XPTR_NULL ) |
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[1] | 126 | { |
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[440] | 127 | |
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| 128 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 129 | printk("\n[ERROR] in %s GETVALUE: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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| 130 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[440] | 131 | #endif |
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[1] | 132 | this->errno = EINVAL; |
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| 133 | return -1; |
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| 134 | } |
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[457] | 135 | |
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| 136 | // call relevant kernel function to get semaphore current value |
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[566] | 137 | uint32_t current; |
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[457] | 138 | remote_sem_get_value( sem_xp , ¤t ); |
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[1] | 139 | |
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[457] | 140 | // return value to user |
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[626] | 141 | hal_copy_to_uspace( local_cxy, |
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| 142 | ¤t, |
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| 143 | current_value, |
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| 144 | sizeof(uint32_t) ); |
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[1] | 145 | } |
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[566] | 146 | break; |
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[1] | 147 | ////////////// |
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| 148 | case SEM_WAIT: |
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| 149 | { |
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| 150 | // get extended pointer on remote semaphore |
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[566] | 151 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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[1] | 152 | |
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[457] | 153 | // check semaphore registered |
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| 154 | if( sem_xp == XPTR_NULL ) |
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[1] | 155 | { |
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[440] | 156 | |
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| 157 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 158 | printk("\n[ERROR] in %s WAIT: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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| 159 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[624] | 160 | hal_vmm_display( process , true ); |
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[440] | 161 | #endif |
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[1] | 162 | this->errno = EINVAL; |
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| 163 | return -1; |
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| 164 | } |
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[457] | 165 | |
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| 166 | // call relevant kernel function to wait semaphore available |
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| 167 | remote_sem_wait( sem_xp ); |
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[1] | 168 | } |
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[566] | 169 | break; |
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[1] | 170 | ////////////// |
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| 171 | case SEM_POST: |
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| 172 | { |
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| 173 | // get extended pointer on remote semaphore |
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[566] | 174 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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[1] | 175 | |
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[457] | 176 | // check semaphore registered |
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| 177 | if( sem_xp == XPTR_NULL ) |
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[1] | 178 | { |
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[440] | 179 | |
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| 180 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 181 | printk("\n[ERROR] in %s POST: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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| 182 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[440] | 183 | #endif |
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[1] | 184 | this->errno = EINVAL; |
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| 185 | return -1; |
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| 186 | } |
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[457] | 187 | |
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| 188 | // call relevant kernel function to release semaphore |
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| 189 | remote_sem_post( sem_xp ); |
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[1] | 190 | } |
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[566] | 191 | break; |
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[1] | 192 | ///////////////// |
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| 193 | case SEM_DESTROY: |
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| 194 | { |
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| 195 | // get extended pointer on remote semaphore |
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[566] | 196 | xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr ); |
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[1] | 197 | |
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[457] | 198 | // check semaphore registered |
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| 199 | if( sem_xp == XPTR_NULL ) |
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[1] | 200 | { |
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[440] | 201 | |
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| 202 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 203 | printk("\n[ERROR] in %s DESTROY: semaphore %x not found / thread %x in process %x / cycle %d\n", |
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| 204 | __FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[440] | 205 | #endif |
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[1] | 206 | this->errno = EINVAL; |
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| 207 | return -1; |
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| 208 | } |
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[457] | 209 | |
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| 210 | // destroy semaphore |
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| 211 | remote_sem_destroy( sem_xp ); |
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[1] | 212 | } |
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[566] | 213 | break; |
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[1] | 214 | /////// |
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| 215 | default: // undefined operation |
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| 216 | { |
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[457] | 217 | |
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| 218 | #if DEBUG_SYSCALLS_ERROR |
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[469] | 219 | printk("\n[ERROR] in %s : undefined operation type %d / thread %x in process %x / cycle %d\n", |
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| 220 | __FUNCTION__ , operation, this->trdid, process->pid, (uint32_t)hal_get_cycles() ); |
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[457] | 221 | #endif |
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| 222 | this->errno = EINVAL; |
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| 223 | return -1; |
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[1] | 224 | } |
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| 225 | } |
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| 226 | |
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[457] | 227 | hal_fence(); |
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| 228 | |
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| 229 | #if DEBUG_SYS_SEM |
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| 230 | tm_end = hal_get_cycles(); |
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| 231 | if( DEBUG_SYS_SEM < tm_end ) |
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[566] | 232 | printk("\n[DBG] %s : thread %x in process %x exit for %s / cost = %d / cycle %d\n", |
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| 233 | __FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ), |
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| 234 | (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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[457] | 235 | #endif |
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| 236 | |
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[1] | 237 | return 0; |
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| 238 | |
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| 239 | } // end sys_sem() |
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