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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/** @file
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Switch Stack functions.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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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. This function
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supports a variable number of arguments following the NewStack parameter.
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These additional arguments are 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 ... This variable argument list is ignored for IA32, x64, and EBC.
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For IPF, this variable argument list is expected to contain
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a single parameter of type VOID * that specifies the new backing
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store pointer.
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**/
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VOID
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EFIAPI
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SwitchStack (
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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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...
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)
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{
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VA_LIST Marker;
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ASSERT (EntryPoint != NULL);
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ASSERT (NewStack != NULL);
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//
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// New stack must 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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VA_START (Marker, NewStack);
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InternalSwitchStack (EntryPoint, Context1, Context2, NewStack, Marker);
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VA_END (Marker);
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//
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// InternalSwitchStack () will never return
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//
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ASSERT (FALSE);
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}
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