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misc: Implement address space size workarounds (#5191)

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* misc: Implement address space size workarounds

This adds code to support userland with less than 39 bits of address
space available by testing reserving multiple sizes and reducing
guess address space when needed.

This is required for ARM64 support when the kernel is
configured to use 63..39 bits for kernel space.(meaning only 38 bits is available to userland)

* Address comments

* Fix 32 bits address space support and address more comments
This commit is contained in:
Mary 2023-06-20 17:33:54 +02:00 • committed by GitHub
parent f9a538bb0f
commit 649d372f7d
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10 changed files with 187 additions and 111 deletions
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45
src/Ryujinx.Cpu/AddressSpace.cs
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@ -5,7 +5,7 @@ using System;
namespace Ryujinx.Cpu
{
class AddressSpace : IDisposable
public class AddressSpace : IDisposable
{
private const ulong PageSize = 0x1000;
@ -154,7 +154,9 @@ namespace Ryujinx.Cpu
public MemoryBlock Base { get; }
public MemoryBlock Mirror { get; }
public AddressSpace(MemoryBlock backingMemory, ulong asSize, bool supports4KBPages)
public ulong AddressSpaceSize { get; }
public AddressSpace(MemoryBlock backingMemory, MemoryBlock baseMemory, MemoryBlock mirrorMemory, ulong addressSpaceSize, bool supports4KBPages)
{
if (!supports4KBPages)
{
@ -163,17 +165,48 @@ namespace Ryujinx.Cpu
_privateTree = new IntrusiveRedBlackTree<PrivateMapping>();
_treeLock = new object();
_mappingTree.Add(new Mapping(0UL, asSize, MappingType.None));
_privateTree.Add(new PrivateMapping(0UL, asSize, default));
_mappingTree.Add(new Mapping(0UL, addressSpaceSize, MappingType.None));
_privateTree.Add(new PrivateMapping(0UL, addressSpaceSize, default));
}
_backingMemory = backingMemory;
_supports4KBPages = supports4KBPages;
Base = baseMemory;
Mirror = mirrorMemory;
AddressSpaceSize = addressSpaceSize;
}
public static bool TryCreate(MemoryBlock backingMemory, ulong asSize, bool supports4KBPages, out AddressSpace addressSpace)
{
addressSpace = null;
MemoryAllocationFlags asFlags = MemoryAllocationFlags.Reserve | MemoryAllocationFlags.ViewCompatible;
Base = new MemoryBlock(asSize, asFlags);
Mirror = new MemoryBlock(asSize, asFlags);
ulong minAddressSpaceSize = Math.Min(asSize, 1UL << 36);
// Attempt to create the address space with expected size or try to reduce it until it succeed.
for (ulong addressSpaceSize = asSize; addressSpaceSize >= minAddressSpaceSize; addressSpaceSize >>= 1)
{
MemoryBlock baseMemory = null;
MemoryBlock mirrorMemory = null;
try
{
baseMemory = new MemoryBlock(addressSpaceSize, asFlags);
mirrorMemory = new MemoryBlock(addressSpaceSize, asFlags);
addressSpace = new AddressSpace(backingMemory, baseMemory, mirrorMemory, addressSpaceSize, supports4KBPages);
break;
}
catch (OutOfMemoryException)
{
baseMemory?.Dispose();
mirrorMemory?.Dispose();
}
}
return addressSpace != null;
}
public void Map(ulong va, ulong pa, ulong size, MemoryMapFlags flags)