drashna/ryujinx
1
0
Fork 0
Code Activity Actions

Optimize address translation and write tracking on the MMU (#571)

Browse source 
* 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
This commit is contained in:
gdkchan 2019-02-24 04:24:35 -03:00 • committed by jduncanator
parent a3d46e4133
commit 5001f78b1d
24 changed files with 1005 additions and 621 deletions
Download patch file Download diff file Expand all files Collapse all files

70
ChocolArm64/Memory/MemoryAllocUnix.cs
View file

@ -1,70 +0,0 @@
using Mono.Unix.Native;
using System;
namespace ChocolArm64.Memory
{
static class MemoryAllocUnix
{
public static IntPtr Allocate(ulong size)
{
ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE);
const MmapProts prot = MmapProts.PROT_READ | MmapProts.PROT_WRITE;
const MmapFlags flags = MmapFlags.MAP_PRIVATE | MmapFlags.MAP_ANONYMOUS;
IntPtr ptr = Syscall.mmap(IntPtr.Zero, size + pageSize, prot, flags, -1, 0);
if (ptr == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
unsafe
{
ptr = new IntPtr(ptr.ToInt64() + (long)pageSize);
*((ulong*)ptr - 1) = size;
}
return ptr;
}
public static bool Reprotect(IntPtr address, ulong size, Memory.MemoryProtection protection)
{
MmapProts prot = GetProtection(protection);
return Syscall.mprotect(address, size, prot) == 0;
}
private static MmapProts GetProtection(Memory.MemoryProtection protection)
{
switch (protection)
{
case Memory.MemoryProtection.None: return MmapProts.PROT_NONE;
case Memory.MemoryProtection.Read: return MmapProts.PROT_READ;
case Memory.MemoryProtection.ReadAndWrite: return MmapProts.PROT_READ | MmapProts.PROT_WRITE;
case Memory.MemoryProtection.ReadAndExecute: return MmapProts.PROT_READ | MmapProts.PROT_EXEC;
case Memory.MemoryProtection.Execute: return MmapProts.PROT_EXEC;
default: throw new ArgumentException($"Invalid permission \"{protection}\".");
}
}
public static bool Free(IntPtr address)
{
ulong pageSize = (ulong)Syscall.sysconf(SysconfName._SC_PAGESIZE);
ulong size;
unsafe
{
size = *((ulong*)address - 1);
address = new IntPtr(address.ToInt64() - (long)pageSize);
}
return Syscall.munmap(address, size + pageSize) == 0;
}
}
}