| 1 | /* |
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| 2 | * kern/sys_rwlock.c - interface to access Read-Write locks service |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #include <types.h> |
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| 24 | #include <errno.h> |
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| 25 | #include <thread.h> |
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| 26 | #include <kmem.h> |
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| 27 | #include <task.h> |
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| 28 | #include <vmm.h> |
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| 29 | #include <kmagics.h> |
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| 30 | #include <rwlock.h> |
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| 31 | |
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| 32 | |
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| 33 | static inline bool_t isBadLock(struct rwlock_s *rwlock) |
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| 34 | { |
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| 35 | return vmm_check_object(rwlock, struct rwlock_s, RWLOCK_ID); |
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| 36 | } |
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| 37 | |
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| 38 | int sys_rwlock(struct rwlock_s **rwlock, uint_t operation) |
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| 39 | { |
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| 40 | kmem_req_t req; |
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| 41 | struct rwlock_s *irwlock; |
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| 42 | error_t err; |
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| 43 | |
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| 44 | err = vmm_check_address("usr rwlock ptr", |
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| 45 | current_task, |
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| 46 | rwlock, |
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| 47 | sizeof(struct rwlock_s*)); |
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| 48 | if(err) |
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| 49 | goto SYS_RWLOCK_END; |
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| 50 | |
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| 51 | if((err = cpu_copy_from_uspace(&irwlock, rwlock, sizeof(struct rwlock_s *)))) |
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| 52 | goto SYS_RWLOCK_END; |
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| 53 | |
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| 54 | switch(operation) |
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| 55 | { |
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| 56 | case RWLOCK_INIT: |
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| 57 | req.type = KMEM_RWLOCK; |
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| 58 | req.size = sizeof(*irwlock); |
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| 59 | req.flags = AF_USER; |
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| 60 | |
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| 61 | if((irwlock = kmem_alloc(&req)) == NULL) |
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| 62 | { |
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| 63 | err = ENOMEM; |
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| 64 | break; |
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| 65 | } |
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| 66 | |
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| 67 | if((err = rwlock_init(irwlock))) |
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| 68 | break; |
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| 69 | |
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| 70 | if((err = cpu_copy_to_uspace(rwlock, &irwlock, sizeof(struct rwlock_s *)))) |
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| 71 | { |
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| 72 | req.ptr = irwlock; |
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| 73 | kmem_free(&req); |
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| 74 | } |
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| 75 | break; |
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| 76 | |
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| 77 | case RWLOCK_WRLOCK: |
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| 78 | if(isBadLock(irwlock)) |
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| 79 | break; |
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| 80 | |
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| 81 | return rwlock_wrlock(irwlock); |
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| 82 | |
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| 83 | case RWLOCK_RDLOCK: |
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| 84 | if(isBadLock(irwlock)) |
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| 85 | break; |
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| 86 | |
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| 87 | return rwlock_rdlock(irwlock); |
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| 88 | |
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| 89 | case RWLOCK_TRYWRLOCK: |
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| 90 | if(isBadLock(irwlock)) |
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| 91 | break; |
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| 92 | |
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| 93 | return rwlock_trywrlock(irwlock); |
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| 94 | |
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| 95 | case RWLOCK_TRYRDLOCK: |
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| 96 | if(isBadLock(irwlock)) |
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| 97 | break; |
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| 98 | |
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| 99 | return rwlock_tryrdlock(irwlock); |
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| 100 | |
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| 101 | case RWLOCK_UNLOCK: |
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| 102 | if(isBadLock(irwlock)) |
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| 103 | break; |
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| 104 | |
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| 105 | if((err = rwlock_unlock(irwlock))) |
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| 106 | break; |
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| 107 | |
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| 108 | case RWLOCK_DESTROY: |
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| 109 | if(isBadLock(irwlock)) |
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| 110 | break; |
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| 111 | |
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| 112 | if((err = rwlock_destroy(irwlock))) |
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| 113 | break; |
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| 114 | |
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| 115 | req.type = KMEM_RWLOCK; |
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| 116 | req.ptr = irwlock; |
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| 117 | kmem_free(&req); |
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| 118 | return 0; |
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| 119 | |
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| 120 | default: |
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| 121 | err = EINVAL; |
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| 122 | } |
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| 123 | |
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| 124 | SYS_RWLOCK_END: |
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| 125 | current_thread->info.errno = err; |
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| 126 | return err; |
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| 127 | } |
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| 128 | |
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| 129 | KMEM_OBJATTR_INIT(rwlock_kmem_init) |
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| 130 | { |
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| 131 | attr->type = KMEM_RWLOCK; |
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| 132 | attr->name = "KCM RWLOCK"; |
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| 133 | attr->size = sizeof(struct rwlock_s); |
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| 134 | attr->aligne = 0; |
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| 135 | attr->min = CONFIG_RWLOCK_MIN; |
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| 136 | attr->max = CONFIG_RWLOCK_MAX; |
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| 137 | attr->ctor = NULL; |
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| 138 | attr->dtor = NULL; |
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| 139 | |
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| 140 | return 0; |
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| 141 | } |
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