suyu/src/common/virtual_buffer.cpp

// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#ifdef _WIN32
#include <windows.h>
#else
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#if defined __APPLE__ || defined __FreeBSD__ || defined __OpenBSD__
#include <sys/sysctl.h>
#elif defined __HAIKU__
#include <OS.h>
#else
#include <sys/sysinfo.h>
#endif
#endif

#include "common/assert.h"
#include "common/virtual_buffer.h"

namespace Common {

void* AllocateMemoryPages(std::size_t size) {
#ifdef _WIN32
    void* base{VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE)};
#else
    void* base{mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0)};

    if (base == MAP_FAILED) {
        base = nullptr;
    }
#endif

    ASSERT(base);

    return base;
}

void FreeMemoryPages(void* base, std::size_t size) {
    if (!base) {
        return;
    }
#ifdef _WIN32
    ASSERT(VirtualFree(base, 0, MEM_RELEASE));
#else
    ASSERT(munmap(base, size) == 0);
#endif
}

} // namespace Common