1 files changed, 73 insertions, 0 deletions

diff --git a/src/common/memory_detect.cpp b/src/common/memory_detect.cpp
new file mode 100644
index 000000000..8cff6ec37
--- /dev/null
+++ b/src/common/memory_detect.cpp
@@ -0,0 +1,73 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#ifdef _WIN32
+// clang-format off
+#include <windows.h>
+#include <sysinfoapi.h>
+// clang-format on
+#else
+#include <sys/types.h>
+#if defined(__APPLE__) || defined(__FreeBSD__)
+#include <sys/sysctl.h>
+#elif defined(__linux__)
+#include <sys/sysinfo.h>
+#else
+#include <unistd.h>
+#endif
+#endif
+
+#include "common/memory_detect.h"
+
+namespace Common {
+
+// Detects the RAM and Swapfile sizes
+static MemoryInfo Detect() {
+    MemoryInfo mem_info{};
+
+#ifdef _WIN32
+    MEMORYSTATUSEX memorystatus;
+    memorystatus.dwLength = sizeof(memorystatus);
+    GlobalMemoryStatusEx(&memorystatus);
+    mem_info.TotalPhysicalMemory = memorystatus.ullTotalPhys;
+    mem_info.TotalSwapMemory = memorystatus.ullTotalPageFile - mem_info.TotalPhysicalMemory;
+#elif defined(__APPLE__)
+    u64 ramsize;
+    struct xsw_usage vmusage;
+    std::size_t sizeof_ramsize = sizeof(ramsize);
+    std::size_t sizeof_vmusage = sizeof(vmusage);
+    // hw and vm are defined in sysctl.h
+    // https://github.com/apple/darwin-xnu/blob/master/bsd/sys/sysctl.h#L471
+    // sysctlbyname(const char *, void *, size_t *, void *, size_t);
+    sysctlbyname("hw.memsize", &ramsize, &sizeof_ramsize, nullptr, 0);
+    sysctlbyname("vm.swapusage", &vmusage, &sizeof_vmusage, nullptr, 0);
+    mem_info.TotalPhysicalMemory = ramsize;
+    mem_info.TotalSwapMemory = vmusage.xsu_total;
+#elif defined(__FreeBSD__)
+    u_long physmem, swap_total;
+    std::size_t sizeof_u_long = sizeof(u_long);
+    // sysctlbyname(const char *, void *, size_t *, const void *, size_t);
+    sysctlbyname("hw.physmem", &physmem, &sizeof_u_long, nullptr, 0);
+    sysctlbyname("vm.swap_total", &swap_total, &sizeof_u_long, nullptr, 0);
+    mem_info.TotalPhysicalMemory = physmem;
+    mem_info.TotalSwapMemory = swap_total;
+#elif defined(__linux__)
+    struct sysinfo meminfo;
+    sysinfo(&meminfo);
+    mem_info.TotalPhysicalMemory = meminfo.totalram;
+    mem_info.TotalSwapMemory = meminfo.totalswap;
+#else
+    mem_info.TotalPhysicalMemory = sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGE_SIZE);
+    mem_info.TotalSwapMemory = 0;
+#endif
+
+    return mem_info;
+}
+
+const MemoryInfo& GetMemInfo() {
+    static MemoryInfo mem_info = Detect();
+    return mem_info;
+}
+
+} // namespace Common
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