MdePkg/Library/BaseLib/AArch64/SwitchStack.S File Reference


Detailed Description

Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.

Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.

Portions copyright (c) 2011 - 2013, ARM Limited. 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.

.text
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GCC_ASM_EXPORT(InternalSwitchStackAsm)
GCC_ASM_EXPORT(CpuPause)

This allows the caller to switch the stack and goes to the new entry point
Parameters:
EntryPoint The pointer to the location to enter
Context Parameter to pass in
Context2 Parameter2 to pass in
NewStack New Location of the stack
Returns:
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 x30, x0
mov sp, x3
mov x0, x1
mov x1, x2
ret

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
ret


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