/** @file | |
SwitchStack() function for IPF. | |
Copyright (c) 2007 - 2010, Intel Corporation. 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. | |
**/ | |
#include "BaseLibInternals.h" | |
/** | |
Transfers control to a function starting with a new stack. | |
Transfers control to the function specified by EntryPoint using the | |
new stack specified by NewStack and passing in the parameters specified | |
by Context1 and Context2. Context1 and Context2 are optional and may | |
be NULL. The function EntryPoint must never return. | |
Marker will be ignored on IA-32, x64, and EBC. | |
IPF CPUs expect one additional parameter of type VOID * that specifies | |
the new backing store pointer. | |
If EntryPoint is NULL, then ASSERT(). | |
If NewStack is NULL, then ASSERT(). | |
@param EntryPoint A pointer to function to call with the new stack. | |
@param Context1 A pointer to the context to pass into the EntryPoint | |
function. | |
@param Context2 A pointer to the context to pass into the EntryPoint | |
function. | |
@param NewStack A pointer to the new stack to use for the EntryPoint | |
function. | |
@param Marker VA_LIST marker for the variable argument list. | |
**/ | |
VOID | |
EFIAPI | |
InternalSwitchStack ( | |
IN SWITCH_STACK_ENTRY_POINT EntryPoint, | |
IN VOID *Context1, OPTIONAL | |
IN VOID *Context2, OPTIONAL | |
IN VOID *NewStack, | |
IN VA_LIST Marker | |
) | |
{ | |
VOID *NewBsp; | |
// | |
// Get new backing store pointer from variable list | |
// | |
NewBsp = VA_ARG (Marker, VOID *); | |
// | |
// New backing store pointer should be aligned with CPU_STACK_ALIGNMENT | |
// | |
ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0); | |
AsmSwitchStackAndBackingStore (EntryPoint, Context1, Context2, NewStack, NewBsp); | |
} |