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Ryujinx/Ryujinx.Cpu/AppleHv/HvVm.cs

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using Ryujinx.Memory;
using System;
namespace Ryujinx.Cpu.AppleHv
{
static class HvVm
{
// This alignment allows us to use larger blocks on the page table.
private const ulong AsIpaAlignment = 1UL << 30;
private static int _addressSpaces;
private static HvIpaAllocator _ipaAllocator;
private static object _lock = new object();
public static (ulong, HvIpaAllocator) CreateAddressSpace(MemoryBlock block)
{
HvIpaAllocator ipaAllocator;
lock (_lock)
{
if (++_addressSpaces == 1)
{
HvApi.hv_vm_create(IntPtr.Zero).ThrowOnError();
_ipaAllocator = ipaAllocator = new HvIpaAllocator();
}
else
{
ipaAllocator = _ipaAllocator;
}
}
ulong baseAddress;
lock (ipaAllocator)
{
baseAddress = ipaAllocator.Allocate(block.Size, AsIpaAlignment);
}
var rwx = hv_memory_flags_t.HV_MEMORY_READ | hv_memory_flags_t.HV_MEMORY_WRITE | hv_memory_flags_t.HV_MEMORY_EXEC;
HvApi.hv_vm_map((ulong)block.Pointer, baseAddress, block.Size, rwx).ThrowOnError();
return (baseAddress, ipaAllocator);
}
public static void DestroyAddressSpace(ulong address, ulong size)
{
HvApi.hv_vm_unmap(address, size);
HvIpaAllocator ipaAllocator;
lock (_lock)
{
if (--_addressSpaces == 0)
{
HvApi.hv_vm_destroy().ThrowOnError();
}
ipaAllocator = _ipaAllocator;
}
lock (ipaAllocator)
{
ipaAllocator.Free(address, size);
}
}
}
}