From 681dbac98cfff748ec076aa294f9129e48dab44f Mon Sep 17 00:00:00 2001
From: bxing <bxing@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 17 Aug 2006 05:32:47 +0000
Subject: Added AsmSwitchStackAndBackingStore() to BaseLib.h for stack
 switching on IPF.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1305 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdePkg/Library/BaseLib/Ipf/SwitchStack.s | 172 +++++++++----------------------
 1 file changed, 50 insertions(+), 122 deletions(-)

(limited to 'MdePkg/Library/BaseLib')

diff --git a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
index 58fe43d87f..a3c524f119 100644
--- a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
+++ b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s
@@ -1,122 +1,50 @@
-//++
-// 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
-//
-// Abstract:
-//
-//  Contains an implementation of a stack switch for the Itanium-based architecture.
-//
-//
-//
-// Revision History:
-//
-//--
-
-  .file  "SwitchStack.s"
-
-#include  "asm.h"
-#include  "ia_64gen.h"
-
-// Define hardware RSE Configuration Register
-//
-// RS Configuration (RSC) bit field positions
-
-#define RSC_MODE       0
-#define RSC_PL         2
-#define RSC_BE         4
-// RSC bits 5-15 reserved
-#define RSC_MBZ0       5
-#define RSC_MBZ0_V     0x3ff
-#define RSC_LOADRS     16
-#define RSC_LOADRS_LEN 14
-// RSC bits 30-63 reserved
-#define RSC_MBZ1       30
-#define RSC_MBZ1_V     0x3ffffffffULL
-
-// RSC modes
-// Lazy
-#define RSC_MODE_LY (0x0)
-// Store intensive
-#define RSC_MODE_SI (0x1)
-// Load intensive
-#define RSC_MODE_LI (0x2)
-// Eager
-#define RSC_MODE_EA (0x3)
-
-// RSC Endian bit values
-#define RSC_BE_LITTLE 0
-#define RSC_BE_BIG    1
-
-// RSC while in kernel: enabled, little endian, pl = 0, eager mode
-#define RSC_KERNEL ((RSC_MODE_EA<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))
-// Lazy RSC in kernel: enabled, little endian, pl = 0, lazy mode
-#define RSC_KERNEL_LAZ ((RSC_MODE_LY<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))
-// RSE disabled: disabled, pl = 0, little endian, eager mode
-#define RSC_KERNEL_DISABLED ((RSC_MODE_LY<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))
-
-
-//VOID
-//InternalSwitchStack (
-//    VOID    *ContinuationFunction,
-//    UINTN   Parameter,
-//    UINTN   NewTopOfStack,
-//    UINTN   NewBSPStore OPTIONAL
-//)
-///*++
-//
-//Input Arguments
-//
-//  ContinuationFunction - This is a pointer to the PLABEL of the function that should  be called once the
-//        new stack has been created.  
-//  Parameter - The parameter to pass to the continuation function
-//  NewTopOfStack - This is the new top of the memory stack for ensuing code.  This is mandatory and
-//      should be non-zero
-//  NewBSPStore - This is the new BSP store for the ensuing code.  It is optional on IA-32 and mandatory on Itanium-based platform.
-//
-//--*/
-
-PROCEDURE_ENTRY(InternalSwitchStack)
-
-        mov        r16 = -0x10;;
-        and        r16 = r34, r16;;             // get new stack value in R16, 0 the last nibble.
-        mov        r15 = r35;;                  // Get new BspStore into R15
-        mov        r13 = r32;;                  // this is a pointer to the PLABEL of the continuation function.  
-        mov        r17 = r33;;                  // this is the parameter to pass to the continuation function
-
-        alloc       r11=0,0,0,0                 // Set 0-size frame
-        ;;
-        flushrs;;
-
-        mov         r21 = RSC_KERNEL_DISABLED   // for rse disable             
-        ;;
-        mov         ar.rsc = r21                // turn off RSE                
-
-        add         sp = r0, r16;;              // transfer to the EFI stack
-        mov         ar.bspstore = r15           // switch to EFI BSP        
-        invala                                  // change of ar.bspstore needs invala.     
-      
-        mov         r18 = RSC_KERNEL_LAZ        // RSC enabled, Lazy mode
-        ;;
-        mov         ar.rsc = r18                // turn rse on, in kernel mode     
-        ;;        
-        alloc       r11=0,0,1,0;;               // alloc 0 outs going to ensuing DXE IPL service
-        mov         out0 = r17
-        ld8         r16 = [r13],8;;             // r16 = address of continuation function from the PLABEL
-        ld8         gp = [r13]                  // gp  = gp of continuation function from the PLABEL
-        mov         b6 = r16
-        ;;
-        br.call.sptk.few b0=b6;;                // Call the continuation function
-        ;;
-PROCEDURE_EXIT(InternalSwitchStack)
-
-
+/// @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
-- 
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