mirror of https://github.com/acidanthera/audk.git
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/** @file
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SwitchStack() function for IPF.
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Copyright (c) 2007, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name: InternalSwitchStack.c
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**/
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#include <BaseLibInternals.h>
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/**
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Transfers control to a function starting with a new stack.
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Transfers control to the function specified by EntryPoint using the
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new stack specified by NewStack and passing in the parameters specified
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by Context1 and Context2. Context1 and Context2 are optional and may
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be NULL. The function EntryPoint must never return.
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Marker will be ignored on IA-32, x64, and EBC.
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IPF CPUs expect one additional parameter of type VOID * that specifies
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the new backing store pointer.
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If EntryPoint is NULL, then ASSERT().
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If NewStack is NULL, then ASSERT().
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@param EntryPoint A pointer to function to call with the new stack.
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@param Context1 A pointer to the context to pass into the EntryPoint
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function.
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@param Context2 A pointer to the context to pass into the EntryPoint
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function.
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@param NewStack A pointer to the new stack to use for the EntryPoint
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function.
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@param Marker VA_LIST marker for the variable argument list.
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**/
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VOID
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EFIAPI
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InternalSwitchStack (
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IN SWITCH_STACK_ENTRY_POINT EntryPoint,
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IN VOID *Context1, OPTIONAL
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IN VOID *Context2, OPTIONAL
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IN VOID *NewStack,
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IN VA_LIST Marker
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)
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{
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VOID *NewBsp;
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//
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// Get new backing store pointer from variable list
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//
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NewBsp = VA_ARG (Marker, VOID *);
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//
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// Stack should be aligned with CPU_STACK_ALIGNMENT
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//
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ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);
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ASSERT (((UINTN)NewBsp & (CPU_STACK_ALIGNMENT - 1)) == 0);
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AsmSwitchStackAndBackingStore (EntryPoint, Context1, Context2, NewStack, NewBsp);
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}
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