1 files changed, 68 insertions, 0 deletions
diff --git a/Ryujinx.Cpu/AppleHv/HvVm.cs b/Ryujinx.Cpu/AppleHv/HvVm.cs
new file mode 100644
index 00000000..d91abff9
--- /dev/null
+++ b/Ryujinx.Cpu/AppleHv/HvVm.cs
@@ -0,0 +1,68 @@
+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);
+            }
+        }
+    }
+}
+\ No newline at end of file