72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
#ifndef LUMENARIUM_LINUX_MEMORY_H
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#define LUMENARIUM_LINUX_MEMORY_H 1
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static uint64_t linux_page_size_cache_ = 0;
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// https://stackoverflow.com/questions/3351940/detecting-the-memory-page-size
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uint64_t
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os_page_size()
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{
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if (linux_page_size_cache_ == 0)
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{
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long page_size = sysconf(_SC_PAGE_SIZE);
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linux_page_size_cache_ = (uint64_t)page_size;
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}
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return linux_page_size_cache_;
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}
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#define OS_MEM_PAGE_SIZE os_page_size()
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#ifdef DEBUG
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# define linux_memory_assert_always (*((volatile int*)0) = 0xFFFF)
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# define linux_memory_assert(c) do { \
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if (!(c)) { \
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linux_memory_assert_always;\
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}} while(false)
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#endif // DEBUG
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#define SIZE_T_MAX_U64 (uint64_t)((size_t)0 - 1)
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size_t
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linux_round_to_page_size(uint64_t size)
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{
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uint64_t m = SIZE_T_MAX_U64;
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linux_memory_assert(size < SIZE_T_MAX_U64);
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uint64_t rem = size % os_page_size();
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if (rem != 0 || size < os_page_size())
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{
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uint64_t grow = os_page_size() - rem;
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size += grow;
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}
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return (size_t)size;
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}
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uint8_t*
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os_mem_reserve(uint64_t size)
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{
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size_t size_cvt = linux_round_to_page_size(size);
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uint8_t* result = (uint8_t*)malloc(size_cvt);
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return result;
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}
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uint8_t*
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os_mem_commit(uint8_t* base, uint64_t size)
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{
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return base;
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}
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bool
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os_mem_decommit(uint8_t* base, uint64_t size)
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{
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return 1; // true
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}
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bool
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os_mem_release(uint8_t* base, uint64_t size)
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{
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free(base);
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return 1; // true
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}
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#endif // LUMENARIUM_LINUX_MEMORY_H
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