/** @file C functions in SEC Copyright (c) 2014, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent **/ #include #include #include #include #include #include /** 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 TemporaryMemoryBase Base address of the temporary memory. @param PermenentMemoryBase Base address of the permanent memory. **/ VOID EFIAPI SecSwitchStack ( UINT32 TemporaryMemoryBase, UINT32 PermenentMemoryBase ); /** This service of the TEMPORARY_RAM_SUPPORT_PPI that migrates temporary RAM into permanent memory. @param PeiServices Pointer to the PEI Services Table. @param TemporaryMemoryBase Source Address in temporary memory from which the SEC or PEIM will copy the Temporary RAM contents. @param PermanentMemoryBase Destination Address in permanent memory into which the SEC or PEIM will copy the Temporary RAM contents. @param 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; }