From 5001f78b1d07b988709dd5f5d1009ebe9b44c669 Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Sun, 24 Feb 2019 04:24:35 -0300
Subject: Optimize address translation and write tracking on the MMU (#571)

* 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
---
 ChocolArm64/Memory/MemoryAllocUnix.cs | 70 -----------------------------------
 1 file changed, 70 deletions(-)
 delete mode 100644 ChocolArm64/Memory/MemoryAllocUnix.cs

(limited to 'ChocolArm64/Memory/MemoryAllocUnix.cs')

diff --git a/ChocolArm64/Memory/MemoryAllocUnix.cs b/ChocolArm64/Memory/MemoryAllocUnix.cs
deleted file mode 100644
index 857c1c50..00000000
--- a/ChocolArm64/Memory/MemoryAllocUnix.cs
+++ /dev/null
@@ -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;
-        }
-    }
-}
\ No newline at end of file
-- 
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