-//++\r
-// Copyright (c) 2006, Intel Corporation \r
-// All rights reserved. This program and the accompanying materials \r
-// are licensed and made available under the terms and conditions of the BSD License \r
-// which accompanies this distribution. The full text of the license may be found at \r
-// http://opensource.org/licenses/bsd-license.php \r
-// \r
-// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
-// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
-// \r
-// Module Name:\r
-//\r
-// SwitchStack.s\r
-//\r
-// Abstract:\r
-//\r
-// Contains an implementation of a stack switch for the Itanium-based architecture.\r
-//\r
-//\r
-//\r
-// Revision History:\r
-//\r
-//--\r
-\r
- .file "SwitchStack.s"\r
-\r
-#include "asm.h"\r
-#include "ia_64gen.h"\r
-\r
-// Define hardware RSE Configuration Register\r
-//\r
-// RS Configuration (RSC) bit field positions\r
-\r
-#define RSC_MODE 0\r
-#define RSC_PL 2\r
-#define RSC_BE 4\r
-// RSC bits 5-15 reserved\r
-#define RSC_MBZ0 5\r
-#define RSC_MBZ0_V 0x3ff\r
-#define RSC_LOADRS 16\r
-#define RSC_LOADRS_LEN 14\r
-// RSC bits 30-63 reserved\r
-#define RSC_MBZ1 30\r
-#define RSC_MBZ1_V 0x3ffffffffULL\r
-\r
-// RSC modes\r
-// Lazy\r
-#define RSC_MODE_LY (0x0)\r
-// Store intensive\r
-#define RSC_MODE_SI (0x1)\r
-// Load intensive\r
-#define RSC_MODE_LI (0x2)\r
-// Eager\r
-#define RSC_MODE_EA (0x3)\r
-\r
-// RSC Endian bit values\r
-#define RSC_BE_LITTLE 0\r
-#define RSC_BE_BIG 1\r
-\r
-// RSC while in kernel: enabled, little endian, pl = 0, eager mode\r
-#define RSC_KERNEL ((RSC_MODE_EA<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))\r
-// Lazy RSC in kernel: enabled, little endian, pl = 0, lazy mode\r
-#define RSC_KERNEL_LAZ ((RSC_MODE_LY<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))\r
-// RSE disabled: disabled, pl = 0, little endian, eager mode\r
-#define RSC_KERNEL_DISABLED ((RSC_MODE_LY<<RSC_MODE) | (RSC_BE_LITTLE<<RSC_BE))\r
-\r
-\r
-//VOID\r
-//InternalSwitchStack (\r
-// VOID *ContinuationFunction,\r
-// UINTN Parameter,\r
-// UINTN NewTopOfStack,\r
-// UINTN NewBSPStore OPTIONAL\r
-//)\r
-///*++\r
-//\r
-//Input Arguments\r
-//\r
-// ContinuationFunction - This is a pointer to the PLABEL of the function that should be called once the\r
-// new stack has been created. \r
-// Parameter - The parameter to pass to the continuation function\r
-// NewTopOfStack - This is the new top of the memory stack for ensuing code. This is mandatory and\r
-// should be non-zero\r
-// NewBSPStore - This is the new BSP store for the ensuing code. It is optional on IA-32 and mandatory on Itanium-based platform.\r
-//\r
-//--*/\r
-\r
-PROCEDURE_ENTRY(InternalSwitchStack)\r
-\r
- mov r16 = -0x10;;\r
- and r16 = r34, r16;; // get new stack value in R16, 0 the last nibble.\r
- mov r15 = r35;; // Get new BspStore into R15\r
- mov r13 = r32;; // this is a pointer to the PLABEL of the continuation function. \r
- mov r17 = r33;; // this is the parameter to pass to the continuation function\r
-\r
- alloc r11=0,0,0,0 // Set 0-size frame\r
- ;;\r
- flushrs;;\r
-\r
- mov r21 = RSC_KERNEL_DISABLED // for rse disable \r
- ;;\r
- mov ar.rsc = r21 // turn off RSE \r
-\r
- add sp = r0, r16;; // transfer to the EFI stack\r
- mov ar.bspstore = r15 // switch to EFI BSP \r
- invala // change of ar.bspstore needs invala. \r
- \r
- mov r18 = RSC_KERNEL_LAZ // RSC enabled, Lazy mode\r
- ;;\r
- mov ar.rsc = r18 // turn rse on, in kernel mode \r
- ;; \r
- alloc r11=0,0,1,0;; // alloc 0 outs going to ensuing DXE IPL service\r
- mov out0 = r17\r
- ld8 r16 = [r13],8;; // r16 = address of continuation function from the PLABEL\r
- ld8 gp = [r13] // gp = gp of continuation function from the PLABEL\r
- mov b6 = r16\r
- ;;\r
- br.call.sptk.few b0=b6;; // Call the continuation function\r
- ;;\r
-PROCEDURE_EXIT(InternalSwitchStack)\r
-\r
-\r
+/// @file\r
+/// IPF specific SwitchStack() function\r
+///\r
+/// Copyright (c) 2006, Intel Corporation\r
+/// All rights reserved. This program and the accompanying materials\r
+/// are licensed and made available under the terms and conditions of the BSD License\r
+/// which accompanies this distribution. The full text of the license may be found at\r
+/// http://opensource.org/licenses/bsd-license.php\r
+///\r
+/// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+/// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+///\r
+/// Module Name: SwitchStack.s\r
+///\r
+///\r
+\r
+.auto\r
+.text\r
+\r
+.proc AsmSwitchStackAndBackingStore\r
+.type AsmSwitchStackAndBackingStore, @function\r
+.regstk 5, 0, 0, 0\r
+AsmSwitchStackAndBackingStore::\r
+ mov r14 = ar.rsc\r
+ movl r2 = ~((((1 << 14) - 1) << 16) | 3)\r
+\r
+ mov r17 = in1\r
+ mov r18 = in2\r
+ and r2 = r14, r2\r
+\r
+ mov ar.rsc = r2\r
+ mov sp = in3\r
+ mov r19 = in4\r
+\r
+ ld8.nt1 r16 = [in0], 8\r
+ ld8.nta gp = [in0]\r
+ mov r3 = -1\r
+\r
+ loadrs\r
+ mov ar.bspstore = r19\r
+ mov b7 = r16\r
+\r
+ alloc r2 = ar.pfs, 0, 0, 2, 0\r
+ mov out0 = r17\r
+ mov out1 = r18\r
+\r
+ mov ar.rnat = r3\r
+ mov ar.rsc = r14\r
+ br.call.sptk.many b0 = b7\r
+.endp AsmSwitchStackAndBackingStore\r
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