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-rw-r--r--MdePkg/Library/BaseLib/Ipf/SwitchStack.s52
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diff --git a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
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+/// @file
+/// IPF specific SwitchStack() function
+///
+/// Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+/// 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.
+///
+/// Module Name: SwitchStack.s
+///
+///
+
+.auto
+.text
+
+.proc AsmSwitchStackAndBackingStore
+.type AsmSwitchStackAndBackingStore, @function
+.regstk 5, 0, 0, 0
+AsmSwitchStackAndBackingStore::
+ mov r14 = ar.rsc
+ movl r2 = ~((((1 << 14) - 1) << 16) | 3)
+
+ mov r17 = in1
+ mov r18 = in2
+ and r2 = r14, r2
+
+ flushrs
+
+ mov ar.rsc = r2
+ mov sp = in3
+ mov r19 = in4
+
+ ld8.nt1 r16 = [in0], 8
+ ld8.nta gp = [in0]
+ mov r3 = -1
+
+ loadrs
+ mov ar.bspstore = r19
+ mov b7 = r16
+
+ alloc r2 = ar.pfs, 0, 0, 2, 0
+ mov out0 = r17
+ mov out1 = r18
+
+ mov ar.rnat = r3
+ mov ar.rsc = r14
+ br.call.sptk.many b0 = b7
+.endp AsmSwitchStackAndBackingStore