Nils O. Selåsdal
90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
#include "base_core.h"
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#include "platform.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#define IsPageAligned(x) (IsAlignedToPow2(x, platform_page_size()))
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U32 platform_page_size(void)
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{
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return sysconf(_SC_PAGESIZE);
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}
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void *platform_malloc(size_t size)
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{
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return malloc(size);
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}
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void platform_free(void *mem)
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{
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free(mem);
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}
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void *memory_allocate_and_commit(size_t size)
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{
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Assert(IsPageAligned(size));
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void *mem = mmap(0, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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TRACEF("memory_allocate size=%7zu mem=%p\n", size, mem);
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if (mem == MAP_FAILED) {
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mem = NULL;
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} else {
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int rc = madvise(mem, size, MADV_POPULATE_WRITE);
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if (rc != 0) {
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munmap(mem, size);
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mem = NULL;
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}
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}
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return mem;
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}
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void memory_free(void *mem, size_t size)
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{
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TRACEF(" memory_free size=%7zu mem=%p\n", size, mem);
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Assert(IsPageAligned((uintptr_t)mem));
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Assert(IsPageAligned(size));
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int rc = munmap(mem, size);
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Assert(rc == 0);
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}
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void *memory_reserve(size_t size)
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{
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Assert(IsPageAligned(size));
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void *mem = mmap(0, size, PROT_NONE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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TRACEF("memory_reserve size=%7zu mem=%p\n", size, mem);
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if (mem == MAP_FAILED) {
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mem = NULL;
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}
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return mem;
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}
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void memory_commit(void *mem, size_t size)
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{
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Assert(IsPageAligned((uintptr_t)mem));
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Assert(IsPageAligned(size));
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TRACEF("memory_commit size=%7zu mem=%p\n", size, mem);
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int rc;
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rc = mprotect(mem, size, PROT_READ | PROT_WRITE);
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Assert(rc == 0);
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rc = madvise(mem, size, MADV_WILLNEED);
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Assert(rc == 0);
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}
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void memory_decommit(void *mem, size_t size)
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{
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TRACEF("memory_decommit size=%7zu mem=%p\n", size, mem);
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Assert(IsPageAligned((uintptr_t)mem));
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Assert(IsPageAligned(size));
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int rc;
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rc = mprotect(mem, size, PROT_NONE);
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Assert(rc == 0);
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rc = madvise(mem, size, MADV_DONTNEED);
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Assert(rc == 0);
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}
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