From 4ba2428c86d95fdfe9c580dd62e4a94309a4661c Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 8 Apr 2020 17:35:07 -0400
Subject: common: Add VirtualBuffer class, to abstract memory virtualization.

---
 src/common/virtual_buffer.cpp | 52 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/common/virtual_buffer.cpp

(limited to 'src/common/virtual_buffer.cpp')

diff --git a/src/common/virtual_buffer.cpp b/src/common/virtual_buffer.cpp
new file mode 100644
index 000000000..b426f4747
--- /dev/null
+++ b/src/common/virtual_buffer.cpp
@@ -0,0 +1,52 @@
+// 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
-- 
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