1 files changed, 50 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ipf/SwitchStack.s b/OldMdePkg/Library/BaseLib/Ipf/SwitchStack.s
new file mode 100644
index 0000000000..a3c524f119
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+++ b/OldMdePkg/Library/BaseLib/Ipf/SwitchStack.s
@@ -0,0 +1,50 @@
+/// @file
+///  IPF specific SwitchStack() function
+///
+/// Copyright (c) 2006, Intel Corporation
+/// 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.
+///
+/// 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
+
+        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