diff options
| author | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
|---|---|---|
| committer | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
| commit | 878ddf1fc3540a715f63594ed22b6929e881afb4 (patch) | |
| tree | c56c44dac138137b510e1fba7c3efe5e4d84bea2 /MdePkg/Library/BaseLib/Ipf/SwitchStack.s | |
| download | edk2-platforms-878ddf1fc3540a715f63594ed22b6929e881afb4.tar.xz | |
Initial import.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/Ipf/SwitchStack.s')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ipf/SwitchStack.s | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ipf/SwitchStack.s b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s new file mode 100644 index 0000000000..4dd17f533e --- /dev/null +++ b/MdePkg/Library/BaseLib/Ipf/SwitchStack.s @@ -0,0 +1,122 @@ +//++
+// 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
+//SwitchStack (
+// 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(SwitchStack)
+
+ 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(SwitchStack)
+
+
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