80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*
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* Copyright (c) 2019 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <sys/mutex.h>
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#include <syscall_handler.h>
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#include <kernel_structs.h>
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static struct k_mutex *get_k_mutex(struct sys_mutex *mutex)
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{
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struct z_object *obj;
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obj = z_object_find(mutex);
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if (obj == NULL || obj->type != K_OBJ_SYS_MUTEX) {
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return NULL;
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}
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return obj->data.mutex;
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}
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static bool check_sys_mutex_addr(struct sys_mutex *addr)
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{
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/* sys_mutex memory is never touched, just used to lookup the
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* underlying k_mutex, but we don't want threads using mutexes
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* that are outside their memory domain
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*/
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return Z_SYSCALL_MEMORY_WRITE(addr, sizeof(struct sys_mutex));
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}
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int z_impl_z_sys_mutex_kernel_lock(struct sys_mutex *mutex, k_timeout_t timeout)
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{
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struct k_mutex *kernel_mutex = get_k_mutex(mutex);
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if (kernel_mutex == NULL) {
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return -EINVAL;
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}
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return k_mutex_lock(kernel_mutex, timeout);
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}
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static inline int z_vrfy_z_sys_mutex_kernel_lock(struct sys_mutex *mutex,
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k_timeout_t timeout)
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{
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if (check_sys_mutex_addr(mutex)) {
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return -EACCES;
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}
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return z_impl_z_sys_mutex_kernel_lock(mutex, timeout);
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}
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#include <syscalls/z_sys_mutex_kernel_lock_mrsh.c>
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int z_impl_z_sys_mutex_kernel_unlock(struct sys_mutex *mutex)
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{
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struct k_mutex *kernel_mutex = get_k_mutex(mutex);
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if (kernel_mutex == NULL || kernel_mutex->lock_count == 0) {
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return -EINVAL;
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}
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if (kernel_mutex->owner != _current) {
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return -EPERM;
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}
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k_mutex_unlock(kernel_mutex);
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return 0;
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}
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static inline int z_vrfy_z_sys_mutex_kernel_unlock(struct sys_mutex *mutex)
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{
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if (check_sys_mutex_addr(mutex)) {
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return -EACCES;
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}
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return z_impl_z_sys_mutex_kernel_unlock(mutex);
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}
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#include <syscalls/z_sys_mutex_kernel_unlock_mrsh.c>
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