Nils O. Selåsdal
90 lines
2.1 KiB
C
90 lines
2.1 KiB
C
#include "base_core.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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U32 platform_page_size(void)
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{
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return getpagesize();
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}
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static INLINE size_t AlignToPageSize(size_t sz)
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{
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U32 page_size = platform_page_size();
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size_t aligned_sz = AlignUpPow2(sz, page_size);
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return aligned_sz;
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}
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static INLINE size_t AlignToPageStart(size_t sz)
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{
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U32 page_size = platform_page_size();
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size_t aligned_sz = AlignDownPow2(sz, page_size);
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return aligned_sz;
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}
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void *platform_malloc(size_t sz)
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{
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return malloc(sz);
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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(size_t sz)
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{
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if (sz == 0) {
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sz = 1;
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}
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size_t aligned_sz = AlignToPageSize(sz);
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void *mem = mmap(0, aligned_sz, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
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TRACEF("memory_allocate size=%zu aligned_size=%zu mem=%p\n", sz, aligned_sz, 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_free(void *mem, size_t sz)
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{
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size_t aligned_sz = AlignToPageSize(sz);
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TRACEF(" memory_free size=%zu aligned_size=%zu mem=%p\n", sz, aligned_sz, mem);
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int rc = munmap(mem, aligned_sz);
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Assert(rc == 0);
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}
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void memory_commit(void *mem, size_t sz)
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{
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size_t aligned_sz = AlignToPageSize(sz);
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void *aligned_mem = (void *)AlignToPageStart((uintptr_t)mem);
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TRACEF("memory_commit size=%zu aligned_size=%zu ptr=%p aligned_mem=%p\n", sz, aligned_sz, mem, aligned_mem);
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int rc;
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rc = mprotect(aligned_mem, aligned_sz, PROT_READ | PROT_WRITE);
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Assert(rc == 0);
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rc = madvise(aligned_mem, aligned_sz, MADV_WILLNEED);
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Assert(rc == 0);
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}
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void memory_decommit(void *mem, size_t sz)
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{
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size_t aligned_sz = AlignToPageSize(sz);
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void *aligned_mem = (void *)AlignToPageStart((uintptr_t)mem);
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TRACEF("memory_commit size=%zu aligned_size=%zu ptr=%p aligned_mem=%p\n", sz, aligned_sz, mem, aligned_mem);
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int rc;
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rc = mprotect(aligned_mem, aligned_sz, PROT_NONE);
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Assert(rc == 0);
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rc = madvise(aligned_mem, aligned_sz, MADV_DONTNEED);
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Assert(rc == 0);
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}
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