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

1 files changed, 50 insertions, 122 deletions

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