Add ARM support

Add C inline assembly files for IA32 and X64 GCC builds.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9113 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseLib/Arm/GccInline.c

@@ -0,0 +1,61 @@
+/** @file
+  GCC inline implementation of BaseLib processor specific functions.
+  
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>
+  Portions copyright (c) 2008-2009 Apple Inc.<BR>
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+  Requests CPU to pause for a short period of time.
+
+  Requests CPU to pause for a short period of time. Typically used in MP
+  systems to prevent memory starvation while waiting for a spin lock.
+
+**/
+VOID
+EFIAPI
+CpuPause (
+  VOID
+  )
+{
+  __asm__ __volatile__ (
+    "nop\n\t"
+    "nop\n\t"
+    "nop\n\t"
+    "nop\n\t"
+    "nop\n\t"
+    );
+}
+
+VOID
+EFIAPI
+InternalSwitchStackAsm (
+  SWITCH_STACK_ENTRY_POINT EntryPoint,
+  VOID  *Context,
+  VOID  *Context2,
+  VOID  *NewStack
+  )
+{
+  __asm__ __volatile__ (
+    "mov  lr, %0\n\t"
+    "mov  sp, %3\n\t"
+    "mov  %r0, %1\n\t"
+    "mov  %r1, %2\n\t"
+    "bx   lr\n\t"
+    : /* no output operand */
+    : "r" (EntryPoint),
+      "r" (Context),
+      "r" (Context2),
+      "r" (NewStack)
+    );
+}