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Add initial version of Open Virtual Machine Firmware (OVMF) platform.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8398 6f19259b-4bc3-4df7-8a09-765794883524
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jljusten
2009-05-27 21:10:18 +00:00
parent a1f11f7547
commit 49ba9447c9
51 changed files with 6799 additions and 0 deletions
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136
OvmfPkg/Sec/Ia32/SwitchStack.c Normal file
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/** @file
Switch Stack functions.
Copyright (c) 2006 - 2007, Intel Corporation<BR>
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.
**/
//
// Include common header file for this module.
//
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.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.
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 NewBsp A pointer to the new BSP for the EntryPoint on IPF. It's
Reserved on other architectures.
**/
VOID
EFIAPI
PeiSwitchStacks (
IN SWITCH_STACK_ENTRY_POINT EntryPoint,
IN VOID *Context1, OPTIONAL
IN VOID *Context2, OPTIONAL
IN VOID *Context3, OPTIONAL
IN VOID *OldTopOfStack,
IN VOID *NewStack
)
{
BASE_LIBRARY_JUMP_BUFFER JumpBuffer;
ASSERT (EntryPoint != NULL);
ASSERT (NewStack != NULL);
//
// Stack should be aligned with CPU_STACK_ALIGNMENT
//
ASSERT (((UINTN)NewStack & (CPU_STACK_ALIGNMENT - 1)) == 0);
JumpBuffer.Eip = (UINTN)EntryPoint;
JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);
JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2) + sizeof(Context3);
((VOID**)JumpBuffer.Esp)[1] = Context1;
((VOID**)JumpBuffer.Esp)[2] = Context2;
((VOID**)JumpBuffer.Esp)[3] = Context3;
LongJump (&JumpBuffer, (UINTN)-1);
//
// InternalSwitchStack () will never return
//
ASSERT (FALSE);
}
/**
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.
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 NewBsp A pointer to the new BSP for the EntryPoint on IPF. It's
Reserved on other architectures.
**/
VOID
EFIAPI
SecSwitchStack (
IN UINTN TemporaryMemoryBase,
IN UINTN PermanentMemoryBase,
IN UINTN CopySize
)
{
BASE_LIBRARY_JUMP_BUFFER JumpBuffer;
UINTN SetJumpFlag;
ASSERT ((VOID*)TemporaryMemoryBase != NULL);
ASSERT ((VOID*)PermanentMemoryBase != NULL);
SetJumpFlag = SetJump (&JumpBuffer);
//
// The initial call to SetJump() must always return 0.
// Subsequent calls to LongJump() may cause a non-zero value to be returned by SetJump().
//
if (SetJumpFlag == 0) {
DEBUG ((EFI_D_ERROR, "SecSwitchStack+%d: Esp: 0x%xL\n", __LINE__, JumpBuffer.Esp));
JumpBuffer.Esp =
(INTN)JumpBuffer.Esp -
(INTN)TemporaryMemoryBase +
(INTN)PermanentMemoryBase;
MemoryFence ();
CopyMem((VOID*)PermanentMemoryBase, (VOID*)TemporaryMemoryBase, CopySize);
LongJump (&JumpBuffer, (UINTN)-1);
}
}