b9ca25cb68
- inforamtion -> information - tempory -> temporary - boundry -> boundary - immediatly -> immediately - permenent -> permanent Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Gary Lin <glin@suse.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Giri P Mudusuru <giri.p.mudusuru@intel.com>
155 lines
4.8 KiB
C
155 lines
4.8 KiB
C
/** @file
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Sample to provide SecTemporaryRamSupport function.
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Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
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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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**/
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#include <PiPei.h>
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#include <Ppi/TemporaryRamSupport.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Library/DebugAgentLib.h>
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/**
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Switch the stack in the temporary memory to the one in the permanent memory.
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This function must be invoked after the memory migration immediately. The relative
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position of the stack in the temporary and permanent memory is same.
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@param[in] TemporaryMemoryBase Base address of the temporary memory.
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@param[in] PermenentMemoryBase Base address of the permanent memory.
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**/
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VOID
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EFIAPI
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SecSwitchStack (
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IN UINT32 TemporaryMemoryBase,
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IN UINT32 PermenentMemoryBase
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);
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/**
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This service of the TEMPORARY_RAM_SUPPORT_PPI that migrates temporary RAM into
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permanent memory.
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@param[in] PeiServices Pointer to the PEI Services Table.
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@param[in] TemporaryMemoryBase Source Address in temporary memory from which the SEC or PEIM will copy the
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Temporary RAM contents.
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@param[in] PermanentMemoryBase Destination Address in permanent memory into which the SEC or PEIM will copy the
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Temporary RAM contents.
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@param[in] CopySize Amount of memory to migrate from temporary to permanent memory.
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@retval EFI_SUCCESS The data was successfully returned.
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@retval EFI_INVALID_PARAMETER PermanentMemoryBase + CopySize > TemporaryMemoryBase when
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TemporaryMemoryBase > PermanentMemoryBase.
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**/
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EFI_STATUS
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EFIAPI
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SecTemporaryRamSupport (
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN EFI_PHYSICAL_ADDRESS TemporaryMemoryBase,
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IN EFI_PHYSICAL_ADDRESS PermanentMemoryBase,
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IN UINTN CopySize
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)
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{
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IA32_DESCRIPTOR IdtDescriptor;
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VOID* OldHeap;
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VOID* NewHeap;
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VOID* OldStack;
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VOID* NewStack;
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DEBUG_AGENT_CONTEXT_POSTMEM_SEC DebugAgentContext;
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BOOLEAN OldStatus;
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UINTN PeiStackSize;
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PeiStackSize = (UINTN)PcdGet32 (PcdPeiTemporaryRamStackSize);
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if (PeiStackSize == 0) {
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PeiStackSize = (CopySize >> 1);
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}
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ASSERT (PeiStackSize < CopySize);
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//
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// |-------------------|---->
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// | Stack | PeiStackSize
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// |-------------------|---->
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// | Heap | PeiTemporayRamSize
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// |-------------------|----> TempRamBase
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//
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// |-------------------|---->
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// | Heap | PeiTemporayRamSize
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// |-------------------|---->
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// | Stack | PeiStackSize
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// |-------------------|----> PermanentMemoryBase
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//
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OldHeap = (VOID*)(UINTN)TemporaryMemoryBase;
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NewHeap = (VOID*)((UINTN)PermanentMemoryBase + PeiStackSize);
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OldStack = (VOID*)((UINTN)TemporaryMemoryBase + CopySize - PeiStackSize);
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NewStack = (VOID*)(UINTN)PermanentMemoryBase;
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DebugAgentContext.HeapMigrateOffset = (UINTN)NewHeap - (UINTN)OldHeap;
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DebugAgentContext.StackMigrateOffset = (UINTN)NewStack - (UINTN)OldStack;
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OldStatus = SaveAndSetDebugTimerInterrupt (FALSE);
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//
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// Initialize Debug Agent to support source level debug in PEI phase after memory ready.
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// It will build HOB and fix up the pointer in IDT table.
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//
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InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, (VOID *) &DebugAgentContext, NULL);
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//
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// Migrate Heap
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//
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CopyMem (NewHeap, OldHeap, CopySize - PeiStackSize);
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//
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// Migrate Stack
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//
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CopyMem (NewStack, OldStack, PeiStackSize);
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//
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// We need *not* fix the return address because currently,
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// The PeiCore is executed in flash.
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//
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//
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// Rebase IDT table in permanent memory
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//
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AsmReadIdtr (&IdtDescriptor);
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IdtDescriptor.Base = IdtDescriptor.Base - (UINTN)OldStack + (UINTN)NewStack;
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AsmWriteIdtr (&IdtDescriptor);
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//
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// Program MTRR
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//
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//
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// SecSwitchStack function must be invoked after the memory migration
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// immediately, also we need fixup the stack change caused by new call into
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// permanent memory.
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//
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SecSwitchStack (
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(UINT32) (UINTN) OldStack,
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(UINT32) (UINTN) NewStack
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);
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SaveAndSetDebugTimerInterrupt (OldStatus);
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return EFI_SUCCESS;
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}
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