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53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/* See the end of this file for copyright, license, and warranty information. */
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#include <ardix/syscall.h>
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#include <stddef.h>
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#include <stdlib.h>
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/*
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* kmalloc() and free() are system calls in Ardix because the heap is shared
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* among all tasks and locked using a mutex. If the lock is already claimed,
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* the `mutex_lock()` routine will suspend the current task until the lock
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* becomes available to the current process. However, this can only happen
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* when we already are in kernel space.
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*/
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void *malloc(size_t size)
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{
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if (size == 0) {
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return NULL;
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} else {
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long int intptr = syscall(SYS_malloc, (sysarg_t)size);
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return *(void **)&intptr;
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}
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}
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void *calloc(size_t nmemb, size_t size)
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{
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size_t total = nmemb * size;
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if (nmemb != 0 && total / nmemb != size)
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return NULL; /* overflow check as mandated by POSIX.1 */
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long int intptr = syscall(SYS_malloc, (sysarg_t)total);
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return *(void **)&intptr;
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}
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void free(void *ptr)
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{
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if (ptr != NULL)
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syscall(SYS_free, (sysarg_t)ptr);
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}
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/*
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* This file is part of Ardix.
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* Copyright (c) 2020, 2021 Felix Kopp <owo@fef.moe>.
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*
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* Ardix is non-violent software: you may only use, redistribute,
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* and/or modify it under the terms of the CNPLv6+ as found in
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* the LICENSE file in the source code root directory or at
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* <https://git.pixie.town/thufie/CNPL>.
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*
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* Ardix comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPLv6+ for details.
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*/
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