46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
#define WIN32_PAGE_SIZE KB(4)
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u64 platform_page_size() { return WIN32_PAGE_SIZE; }
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u8*
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platform_mem_reserve(u64 size)
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{
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size_t size_cvt = (size_t)round_size_to_page_multiple(size);
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DWORD alloc_type = MEM_RESERVE;
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DWORD protection = PAGE_READWRITE;
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u8* result = (u8*)VirtualAlloc(0, size_cvt, alloc_type, protection);
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if (!result) win32_get_last_error();
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return result;
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}
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u8*
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platform_mem_commit(u8* base, u64 size)
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{
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size_t size_cvt = (size_t)round_size_to_page_multiple(size);
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DWORD alloc_type = MEM_COMMIT;
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DWORD protection = PAGE_READWRITE;
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u8* result = (u8*)VirtualAlloc(base, size_cvt, alloc_type, protection);
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if (!result) win32_get_last_error();
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return result;
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}
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bool
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platform_mem_decommit(u8* base, u64 size)
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{
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DWORD free_type = MEM_DECOMMIT;
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bool result = VirtualFree(base, (size_t)size, free_type);
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if (!result) win32_get_last_error();
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return result;
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}
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bool
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platform_mem_release(u8* base, u64 size)
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{
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DWORD free_type = MEM_RELEASE;
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// according to the docs, if we're releasing memory, the size must be
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// zero as its implied VirtualFree will free the entire region
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bool result = VirtualFree(base, 0, free_type);
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if (!result) win32_get_last_error();
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return result;
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}
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