Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r
\r
Performs an atomic compare exchange operation on the 32-bit unsigned integer\r
- specified by Value. If Value is equal to CompareValue, then Value is set to \r
+ specified by Value. If Value is equal to CompareValue, then Value is set to\r
ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r
- then Value is returned. The compare exchange operation must be performed using \r
+ then Value is returned. The compare exchange operation must be performed using\r
MP safe mechanisms.\r
\r
If Value is NULL, then ASSERT().\r
/**\r
Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
\r
- Performs an atomic compare exchange operation on the 64-bit unsigned integer specified \r
- by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and \r
- CompareValue is returned. If Value is not equal to CompareValue, then Value is returned. \r
+ Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
+ by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
+ CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r
The compare exchange operation must be performed using MP safe mechanisms.\r
\r
If Value is NULL, then ASSERT().\r
IN OUT THUNK_CONTEXT *ThunkContext\r
);\r
\r
+/**\r
+ Transfers control to a function starting with a new stack.\r
+\r
+ Transfers control to the function specified by EntryPoint using the new stack\r
+ specified by NewStack and passing in the parameters specified by Context1 and\r
+ Context2. Context1 and Context2 are optional and may be NULL. The function\r
+ EntryPoint must never return.\r
+\r
+ If EntryPoint is NULL, then ASSERT().\r
+ If NewStack is NULL, then ASSERT().\r
+\r
+ @param EntryPoint A pointer to function to call with the new stack.\r
+ @param Context1 A pointer to the context to pass into the EntryPoint\r
+ function.\r
+ @param Context2 A pointer to the context to pass into the EntryPoint\r
+ function.\r
+ @param NewStack A pointer to the new stack to use for the EntryPoint\r
+ function.\r
+ @param NewBsp A pointer to the new memory location for RSE backing\r
+ store.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+AsmSwitchStackAndBackingStore (\r
+ IN SWITCH_STACK_ENTRY_POINT EntryPoint,\r
+ IN VOID *Context1, OPTIONAL\r
+ IN VOID *Context2, OPTIONAL\r
+ IN VOID *NewStack,\r
+ IN VOID *NewBsp\r
+ );\r
+\r
#endif\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:\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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