mirror of
https://github.com/ryujinx-mirror/ryujinx.git
synced 2024-12-23 06:45:44 +00:00
5001f78b1d
* Implement faster address translation and write tracking on the MMU * Rename MemoryAlloc to MemoryManagement, and other nits * Support multi-level page tables * Fix typo * Reword comment a bit * Support scalar vector loads/stores on the memory fast path, and minor fixes * Add missing cast * Alignment * Fix VirtualFree function signature * Change MemoryProtection enum to uint aswell for consistency
151 lines
No EOL
5.3 KiB
C#
151 lines
No EOL
5.3 KiB
C#
using System;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace ChocolArm64.Memory
|
|
{
|
|
static class CompareExchange128
|
|
{
|
|
private struct Int128
|
|
{
|
|
public ulong Low { get; }
|
|
public ulong High { get; }
|
|
|
|
public Int128(ulong low, ulong high)
|
|
{
|
|
Low = low;
|
|
High = high;
|
|
}
|
|
}
|
|
|
|
private delegate Int128 InterlockedCompareExchange(IntPtr address, Int128 expected, Int128 desired);
|
|
|
|
private delegate int GetCpuId();
|
|
|
|
private static InterlockedCompareExchange _interlockedCompareExchange;
|
|
|
|
static CompareExchange128()
|
|
{
|
|
if (RuntimeInformation.OSArchitecture != Architecture.X64 || !IsCmpxchg16bSupported())
|
|
{
|
|
throw new PlatformNotSupportedException();
|
|
}
|
|
|
|
byte[] interlockedCompareExchange128Code;
|
|
|
|
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
|
|
{
|
|
interlockedCompareExchange128Code = new byte[]
|
|
{
|
|
0x53, // push rbx
|
|
0x49, 0x8b, 0x00, // mov rax, [r8]
|
|
0x49, 0x8b, 0x19, // mov rbx, [r9]
|
|
0x49, 0x89, 0xca, // mov r10, rcx
|
|
0x49, 0x89, 0xd3, // mov r11, rdx
|
|
0x49, 0x8b, 0x49, 0x08, // mov rcx, [r9+8]
|
|
0x49, 0x8b, 0x50, 0x08, // mov rdx, [r8+8]
|
|
0xf0, 0x49, 0x0f, 0xc7, 0x0b, // lock cmpxchg16b [r11]
|
|
0x49, 0x89, 0x02, // mov [r10], rax
|
|
0x4c, 0x89, 0xd0, // mov rax, r10
|
|
0x49, 0x89, 0x52, 0x08, // mov [r10+8], rdx
|
|
0x5b, // pop rbx
|
|
0xc3 // ret
|
|
};
|
|
}
|
|
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ||
|
|
RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
|
|
{
|
|
interlockedCompareExchange128Code = new byte[]
|
|
{
|
|
0x53, // push rbx
|
|
0x49, 0x89, 0xd1, // mov r9, rdx
|
|
0x48, 0x89, 0xcb, // mov rbx, rcx
|
|
0x48, 0x89, 0xf0, // mov rax, rsi
|
|
0x4c, 0x89, 0xca, // mov rdx, r9
|
|
0x4c, 0x89, 0xc1, // mov rcx, r8
|
|
0xf0, 0x48, 0x0f, 0xc7, 0x0f, // lock cmpxchg16b [rdi]
|
|
0x5b, // pop rbx
|
|
0xc3 // ret
|
|
};
|
|
}
|
|
else
|
|
{
|
|
throw new PlatformNotSupportedException();
|
|
}
|
|
|
|
IntPtr funcPtr = MapCodeAsExecutable(interlockedCompareExchange128Code);
|
|
|
|
_interlockedCompareExchange = Marshal.GetDelegateForFunctionPointer<InterlockedCompareExchange>(funcPtr);
|
|
}
|
|
|
|
private static bool IsCmpxchg16bSupported()
|
|
{
|
|
byte[] getCpuIdCode = new byte[]
|
|
{
|
|
0x53, // push rbx
|
|
0xb8, 0x01, 0x00, 0x00, 0x00, // mov eax, 0x1
|
|
0x0f, 0xa2, // cpuid
|
|
0x89, 0xc8, // mov eax, ecx
|
|
0x5b, // pop rbx
|
|
0xc3 // ret
|
|
};
|
|
|
|
IntPtr funcPtr = MapCodeAsExecutable(getCpuIdCode);
|
|
|
|
GetCpuId getCpuId = Marshal.GetDelegateForFunctionPointer<GetCpuId>(funcPtr);
|
|
|
|
int cpuId = getCpuId();
|
|
|
|
MemoryManagement.Free(funcPtr);
|
|
|
|
return (cpuId & (1 << 13)) != 0;
|
|
}
|
|
|
|
private static IntPtr MapCodeAsExecutable(byte[] code)
|
|
{
|
|
ulong codeLength = (ulong)code.Length;
|
|
|
|
IntPtr funcPtr = MemoryManagement.Allocate(codeLength);
|
|
|
|
unsafe
|
|
{
|
|
fixed (byte* codePtr = code)
|
|
{
|
|
byte* dest = (byte*)funcPtr;
|
|
|
|
long size = (long)codeLength;
|
|
|
|
Buffer.MemoryCopy(codePtr, dest, size, size);
|
|
}
|
|
}
|
|
|
|
MemoryManagement.Reprotect(funcPtr, codeLength, MemoryProtection.Execute);
|
|
|
|
return funcPtr;
|
|
}
|
|
|
|
public static bool InterlockedCompareExchange128(
|
|
IntPtr address,
|
|
ulong expectedLow,
|
|
ulong expectedHigh,
|
|
ulong desiredLow,
|
|
ulong desiredHigh)
|
|
{
|
|
Int128 expected = new Int128(expectedLow, expectedHigh);
|
|
Int128 desired = new Int128(desiredLow, desiredHigh);
|
|
|
|
Int128 old = _interlockedCompareExchange(address, expected, desired);
|
|
|
|
return old.Low == expected.Low && old.High == expected.High;
|
|
}
|
|
|
|
public static void InterlockedRead128(IntPtr address, out ulong low, out ulong high)
|
|
{
|
|
Int128 zero = new Int128(0, 0);
|
|
|
|
Int128 old = _interlockedCompareExchange(address, zero, zero);
|
|
|
|
low = old.Low;
|
|
high = old.High;
|
|
}
|
|
}
|
|
} |