mirror of https://github.com/acidanthera/audk.git
155 lines
4.8 KiB
C
155 lines
4.8 KiB
C
/** @file
|
|
Sample to provide SecTemporaryRamSupport function.
|
|
|
|
Copyright (c) 2014, 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 <PiPei.h>
|
|
|
|
#include <Ppi/TemporaryRamSupport.h>
|
|
|
|
#include <Library/BaseMemoryLib.h>
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/PcdLib.h>
|
|
#include <Library/DebugAgentLib.h>
|
|
|
|
/**
|
|
Switch the stack in the temporary memory to the one in the permanent memory.
|
|
|
|
This function must be invoked after the memory migration immediately. The relative
|
|
position of the stack in the temporary and permanent memory is same.
|
|
|
|
@param[in] TemporaryMemoryBase Base address of the temporary memory.
|
|
@param[in] PermenentMemoryBase Base address of the permanent memory.
|
|
**/
|
|
VOID
|
|
EFIAPI
|
|
SecSwitchStack (
|
|
IN UINT32 TemporaryMemoryBase,
|
|
IN UINT32 PermenentMemoryBase
|
|
);
|
|
|
|
/**
|
|
This service of the TEMPORARY_RAM_SUPPORT_PPI that migrates temporary RAM into
|
|
permanent memory.
|
|
|
|
@param[in] PeiServices Pointer to the PEI Services Table.
|
|
@param[in] TemporaryMemoryBase Source Address in temporary memory from which the SEC or PEIM will copy the
|
|
Temporary RAM contents.
|
|
@param[in] PermanentMemoryBase Destination Address in permanent memory into which the SEC or PEIM will copy the
|
|
Temporary RAM contents.
|
|
@param[in] CopySize Amount of memory to migrate from temporary to permanent memory.
|
|
|
|
@retval EFI_SUCCESS The data was successfully returned.
|
|
@retval EFI_INVALID_PARAMETER PermanentMemoryBase + CopySize > TemporaryMemoryBase when
|
|
TemporaryMemoryBase > PermanentMemoryBase.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
EFIAPI
|
|
SecTemporaryRamSupport (
|
|
IN CONST EFI_PEI_SERVICES **PeiServices,
|
|
IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase,
|
|
IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase,
|
|
IN UINTN CopySize
|
|
)
|
|
{
|
|
IA32_DESCRIPTOR IdtDescriptor;
|
|
VOID* OldHeap;
|
|
VOID* NewHeap;
|
|
VOID* OldStack;
|
|
VOID* NewStack;
|
|
DEBUG_AGENT_CONTEXT_POSTMEM_SEC DebugAgentContext;
|
|
BOOLEAN OldStatus;
|
|
UINTN PeiStackSize;
|
|
|
|
PeiStackSize = (UINTN)PcdGet32 (PcdPeiTemporaryRamStackSize);
|
|
if (PeiStackSize == 0) {
|
|
PeiStackSize = (CopySize >> 1);
|
|
}
|
|
|
|
ASSERT (PeiStackSize < CopySize);
|
|
|
|
//
|
|
// |-------------------|---->
|
|
// | Stack | PeiStackSize
|
|
// |-------------------|---->
|
|
// | Heap | PeiTemporayRamSize
|
|
// |-------------------|----> TempRamBase
|
|
//
|
|
// |-------------------|---->
|
|
// | Heap | PeiTemporayRamSize
|
|
// |-------------------|---->
|
|
// | Stack | PeiStackSize
|
|
// |-------------------|----> PermanentMemoryBase
|
|
//
|
|
|
|
OldHeap = (VOID*)(UINTN)TemporaryMemoryBase;
|
|
NewHeap = (VOID*)((UINTN)PermanentMemoryBase + PeiStackSize);
|
|
|
|
OldStack = (VOID*)((UINTN)TemporaryMemoryBase + CopySize - PeiStackSize);
|
|
NewStack = (VOID*)(UINTN)PermanentMemoryBase;
|
|
|
|
DebugAgentContext.HeapMigrateOffset = (UINTN)NewHeap - (UINTN)OldHeap;
|
|
DebugAgentContext.StackMigrateOffset = (UINTN)NewStack - (UINTN)OldStack;
|
|
|
|
OldStatus = SaveAndSetDebugTimerInterrupt (FALSE);
|
|
//
|
|
// Initialize Debug Agent to support source level debug in PEI phase after memory ready.
|
|
// It will build HOB and fix up the pointer in IDT table.
|
|
//
|
|
InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, (VOID *) &DebugAgentContext, NULL);
|
|
|
|
//
|
|
// Migrate Heap
|
|
//
|
|
CopyMem (NewHeap, OldHeap, CopySize - PeiStackSize);
|
|
|
|
//
|
|
// Migrate Stack
|
|
//
|
|
CopyMem (NewStack, OldStack, PeiStackSize);
|
|
|
|
|
|
//
|
|
// We need *not* fix the return address because currently,
|
|
// The PeiCore is executed in flash.
|
|
//
|
|
|
|
//
|
|
// Rebase IDT table in permanent memory
|
|
//
|
|
AsmReadIdtr (&IdtDescriptor);
|
|
IdtDescriptor.Base = IdtDescriptor.Base - (UINTN)OldStack + (UINTN)NewStack;
|
|
|
|
AsmWriteIdtr (&IdtDescriptor);
|
|
|
|
|
|
//
|
|
// Program MTRR
|
|
//
|
|
|
|
//
|
|
// SecSwitchStack function must be invoked after the memory migration
|
|
// immediately, also we need fixup the stack change caused by new call into
|
|
// permanent memory.
|
|
//
|
|
SecSwitchStack (
|
|
(UINT32) (UINTN) OldStack,
|
|
(UINT32) (UINTN) NewStack
|
|
);
|
|
|
|
SaveAndSetDebugTimerInterrupt (OldStatus);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|