diff options
| author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
|---|---|---|
| committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
| commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
| tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S | |
| parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
| download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz | |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S')
| -rw-r--r-- | Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S b/Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S new file mode 100644 index 0000000000..2c15eb8832 --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/Arm/SwitchStack.S @@ -0,0 +1,68 @@ +//------------------------------------------------------------------------------
+//
+// Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+// Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+// Portions copyright (c) 2011, ARM Limited. All rights reserved.<BR>
+// 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.
+//
+//------------------------------------------------------------------------------
+
+.text
+.align 5
+
+GCC_ASM_EXPORT(InternalSwitchStackAsm)
+GCC_ASM_EXPORT(CpuPause)
+
+/**
+//
+// This allows the caller to switch the stack and goes to the new entry point
+//
+// @param EntryPoint The pointer to the location to enter
+// @param Context Parameter to pass in
+// @param Context2 Parameter2 to pass in
+// @param NewStack New Location of the stack
+//
+// @return Nothing. Goes to the Entry Point passing in the new parameters
+//
+VOID
+EFIAPI
+InternalSwitchStackAsm (
+ SWITCH_STACK_ENTRY_POINT EntryPoint,
+ VOID *Context,
+ VOID *Context2,
+ VOID *NewStack
+ );
+**/
+ASM_PFX(InternalSwitchStackAsm):
+ MOV LR, R0
+ MOV SP, R3
+ MOV R0, R1
+ MOV R1, R2
+ BX LR
+
+/**
+//
+// Requests CPU to pause for a short period of time.
+//
+// Requests CPU to pause for a short period of time. Typically used in MP
+// systems to prevent memory starvation while waiting for a spin lock.
+//
+VOID
+EFIAPI
+CpuPause (
+ VOID
+ )
+**/
+ASM_PFX(CpuPause):
+ nop
+ nop
+ nop
+ nop
+ nop
+ BX LR
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