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/** @file
Sample to provide SecTemporaryRamSupport function.
Copyright (c) 2015, 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
// immediatly, also we need fixup the stack change caused by new call into
// permenent memory.
//
SecSwitchStack (
(UINT32) (UINTN) OldStack,
(UINT32) (UINTN) NewStack
);
SaveAndSetDebugTimerInterrupt (OldStatus);
return EFI_SUCCESS;
}
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