1 files changed, 157 insertions, 0 deletions
diff --git a/src/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs b/src/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs
new file mode 100644
index 00000000..06324a54
--- /dev/null
+++ b/src/Ryujinx.Common/SystemInfo/MacOSSystemInfo.cs
@@ -0,0 +1,157 @@
+using Ryujinx.Common.Logging;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+using System.Text;
+
+namespace Ryujinx.Common.SystemInfo
+{
+    [SupportedOSPlatform("macos")]
+    partial class MacOSSystemInfo : SystemInfo
+    {
+        internal MacOSSystemInfo()
+        {
+            string cpuName = GetCpuidCpuName();
+
+            if (cpuName == null && sysctlbyname("machdep.cpu.brand_string", out cpuName) != 0)
+            {
+                cpuName = "Unknown";
+            }
+
+            ulong totalRAM = 0;
+
+            if (sysctlbyname("hw.memsize", ref totalRAM) != 0)  // Bytes
+            {
+                totalRAM = 0;
+            }
+
+            CpuName = $"{cpuName} ; {LogicalCoreCount} logical";
+            RamTotal = totalRAM;
+            RamAvailable = GetVMInfoAvailableMemory();
+        }
+
+        static ulong GetVMInfoAvailableMemory()
+        {
+            var port = mach_host_self();
+
+            uint pageSize = 0;
+            var result = host_page_size(port, ref pageSize);
+
+            if (result != 0)
+            {
+                Logger.Error?.Print(LogClass.Application, $"Failed to query Available RAM. host_page_size() error = {result}");
+                return 0;
+            }
+
+            const int flavor = 4; // HOST_VM_INFO64
+            uint count = (uint)(Marshal.SizeOf<VMStatistics64>() / sizeof(int)); // HOST_VM_INFO64_COUNT
+            VMStatistics64 stats = new();
+            result = host_statistics64(port, flavor, ref stats, ref count);
+
+            if (result != 0)
+            {
+                Logger.Error?.Print(LogClass.Application, $"Failed to query Available RAM. host_statistics64() error = {result}");
+                return 0;
+            }
+
+            return (ulong)(stats.FreeCount + stats.InactiveCount) * pageSize;
+        }
+
+        private const string SystemLibraryName = "libSystem.dylib";
+
+        [LibraryImport(SystemLibraryName, SetLastError = true)]
+        private static partial int sysctlbyname([MarshalAs(UnmanagedType.LPStr)] string name, IntPtr oldValue, ref ulong oldSize, IntPtr newValue, ulong newValueSize);
+
+        private static int sysctlbyname(string name, IntPtr oldValue, ref ulong oldSize)
+        {
+            if (sysctlbyname(name, oldValue, ref oldSize, IntPtr.Zero, 0) == -1)
+            {
+                int err = Marshal.GetLastWin32Error();
+
+                Logger.Error?.Print(LogClass.Application, $"Cannot retrieve '{name}'. Error Code {err}");
+
+                return err;
+            }
+
+            return 0;
+        }
+
+        private static int sysctlbyname<T>(string name, ref T oldValue)
+        {
+            unsafe
+            {
+                ulong oldValueSize = (ulong)Unsafe.SizeOf<T>();
+
+                return sysctlbyname(name, (IntPtr)Unsafe.AsPointer(ref oldValue), ref oldValueSize);
+            }
+        }
+
+        private static int sysctlbyname(string name, out string oldValue)
+        {
+            oldValue = default;
+
+            ulong strSize = 0;
+
+            int res = sysctlbyname(name, IntPtr.Zero, ref strSize);
+
+            if (res == 0)
+            {
+                byte[] rawData = new byte[strSize];
+
+                unsafe
+                {
+                    fixed (byte* rawDataPtr = rawData)
+                    {
+                        res = sysctlbyname(name, (IntPtr)rawDataPtr, ref strSize);
+                    }
+
+                    if (res == 0)
+                    {
+                        oldValue = Encoding.ASCII.GetString(rawData);
+                    }
+                }
+            }
+
+            return res;
+        }
+
+        [LibraryImport(SystemLibraryName, SetLastError = true)]
+        private static partial uint mach_host_self();
+
+        [LibraryImport(SystemLibraryName, SetLastError = true)]
+        private static partial int host_page_size(uint host, ref uint out_page_size);
+
+        [StructLayout(LayoutKind.Sequential, Pack = 8)]
+        struct VMStatistics64
+        {
+            public uint FreeCount;
+            public uint ActiveCount;
+            public uint InactiveCount;
+            public uint WireCount;
+            public ulong ZeroFillCount;
+            public ulong Reactivations;
+            public ulong Pageins;
+            public ulong Pageouts;
+            public ulong Faults;
+            public ulong CowFaults;
+            public ulong Lookups;
+            public ulong Hits;
+            public ulong Purges;
+            public uint PurgeableCount;
+            public uint SpeculativeCount;
+            public ulong Decompressions;
+            public ulong Compressions;
+            public ulong Swapins;
+            public ulong Swapouts;
+            public uint CompressorPageCount;
+            public uint ThrottledCount;
+            public uint ExternalPageCount;
+            public uint InternalPageCount;
+            public ulong TotalUncompressedPagesInCompressor;
+        }
+
+        [LibraryImport(SystemLibraryName, SetLastError = true)]
+        private static partial int host_statistics64(uint host_priv, int host_flavor, ref VMStatistics64 host_info64_out, ref uint host_info64_outCnt);
+    }
+}
+\ No newline at end of file