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- /** @file
- Copyright (c) 2014 - 2022, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "SecMain.h"
- #include "SecFsp.h"
- EFI_PEI_TEMPORARY_RAM_SUPPORT_PPI gSecTemporaryRamSupportPpi = {
- SecTemporaryRamSupport
- };
- EFI_PEI_PPI_DESCRIPTOR mPeiSecPlatformInformationPpi[] = {
- {
- EFI_PEI_PPI_DESCRIPTOR_PPI,
- &gFspInApiModePpiGuid,
- NULL
- },
- {
- (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
- &gEfiTemporaryRamSupportPpiGuid,
- &gSecTemporaryRamSupportPpi
- }
- };
- //
- // These are IDT entries pointing to 08:FFFFFFE4h.
- //
- UINT64 mIdtEntryTemplate = 0xffff8e000008ffe4ULL;
- /**
- Entry point to the C language phase of SEC. After the SEC assembly
- code has initialized some temporary memory and set up the stack,
- the control is transferred to this function.
- @param[in] SizeOfRam Size of the temporary memory available for use.
- @param[in] TempRamBase Base address of temporary ram
- @param[in] BootFirmwareVolume Base address of the Boot Firmware Volume.
- @param[in] PeiCore PeiCore entry point.
- @param[in] BootLoaderStack BootLoader stack.
- @param[in] ApiIdx the index of API.
- @return This function never returns.
- **/
- VOID
- EFIAPI
- SecStartup (
- IN UINT32 SizeOfRam,
- IN UINT32 TempRamBase,
- IN VOID *BootFirmwareVolume,
- IN PEI_CORE_ENTRY PeiCore,
- IN UINTN BootLoaderStack,
- IN UINT32 ApiIdx
- )
- {
- EFI_SEC_PEI_HAND_OFF SecCoreData;
- IA32_DESCRIPTOR IdtDescriptor;
- SEC_IDT_TABLE IdtTableInStack;
- UINT32 Index;
- FSP_GLOBAL_DATA PeiFspData;
- IA32_IDT_GATE_DESCRIPTOR ExceptionHandler;
- UINTN IdtSize;
- //
- // Process all libraries constructor function linked to SecCore.
- //
- ProcessLibraryConstructorList ();
- //
- // Initialize floating point operating environment
- // to be compliant with UEFI spec.
- //
- InitializeFloatingPointUnits ();
- //
- // Scenario 1 memory map when running on bootloader stack
- //
- // |-------------------|---->
- // |Idt Table |
- // |-------------------|
- // |PeiService Pointer |
- // |-------------------|
- // | |
- // | |
- // | Heap |
- // | |
- // | |
- // |-------------------|----> TempRamBase
- //
- //
- // |-------------------|
- // |Bootloader stack |----> somewhere in memory, FSP will share this stack.
- // |-------------------|
- //
- // Scenario 2 memory map when running FSP on a separate stack
- //
- // |-------------------|---->
- // |Idt Table |
- // |-------------------|
- // |PeiService Pointer | PeiStackSize
- // |-------------------|
- // | |
- // | Stack |
- // |-------------------|---->
- // | |
- // | |
- // | Heap | PeiTemporaryRamSize
- // | |
- // | |
- // |-------------------|----> TempRamBase
- IdtTableInStack.PeiService = 0;
- AsmReadIdtr (&IdtDescriptor);
- if (IdtDescriptor.Base == 0) {
- ExceptionHandler = FspGetExceptionHandler (mIdtEntryTemplate);
- for (Index = 0; Index < FixedPcdGet8 (PcdFspMaxInterruptSupported); Index++) {
- CopyMem ((VOID *)&IdtTableInStack.IdtTable[Index], (VOID *)&ExceptionHandler, sizeof (IA32_IDT_GATE_DESCRIPTOR));
- }
- IdtSize = sizeof (IdtTableInStack.IdtTable);
- } else {
- IdtSize = IdtDescriptor.Limit + 1;
- if (IdtSize > sizeof (IdtTableInStack.IdtTable)) {
- //
- // ERROR: IDT table size from boot loader is larger than FSP can support, DeadLoop here!
- //
- CpuDeadLoop ();
- } else {
- CopyMem ((VOID *)(UINTN)&IdtTableInStack.IdtTable, (VOID *)IdtDescriptor.Base, IdtSize);
- }
- }
- IdtDescriptor.Base = (UINTN)&IdtTableInStack.IdtTable;
- IdtDescriptor.Limit = (UINT16)(IdtSize - 1);
- AsmWriteIdtr (&IdtDescriptor);
- //
- // Initialize the global FSP data region
- //
- FspGlobalDataInit (&PeiFspData, BootLoaderStack, (UINT8)ApiIdx);
- //
- // Update the base address and length of Pei temporary memory
- //
- SecCoreData.DataSize = sizeof (EFI_SEC_PEI_HAND_OFF);
- SecCoreData.BootFirmwareVolumeBase = BootFirmwareVolume;
- SecCoreData.BootFirmwareVolumeSize = (UINT32)((EFI_FIRMWARE_VOLUME_HEADER *)BootFirmwareVolume)->FvLength;
- //
- // Support FSP reserved temporary memory from the whole temporary memory provided by bootloader.
- // FSP reserved temporary memory will not be given to PeiCore.
- //
- SecCoreData.TemporaryRamBase = (UINT8 *)(UINTN)TempRamBase + PcdGet32 (PcdFspPrivateTemporaryRamSize);
- SecCoreData.TemporaryRamSize = SizeOfRam - PcdGet32 (PcdFspPrivateTemporaryRamSize);
- if (PcdGet8 (PcdFspHeapSizePercentage) == 0) {
- SecCoreData.PeiTemporaryRamBase = SecCoreData.TemporaryRamBase;
- SecCoreData.PeiTemporaryRamSize = SecCoreData.TemporaryRamSize;
- SecCoreData.StackBase = (VOID *)GetFspEntryStack (); // Share the same boot loader stack
- SecCoreData.StackSize = 0;
- } else {
- SecCoreData.PeiTemporaryRamBase = SecCoreData.TemporaryRamBase;
- SecCoreData.PeiTemporaryRamSize = SecCoreData.TemporaryRamSize * PcdGet8 (PcdFspHeapSizePercentage) / 100;
- SecCoreData.StackBase = (VOID *)(UINTN)((UINTN)SecCoreData.TemporaryRamBase + SecCoreData.PeiTemporaryRamSize);
- SecCoreData.StackSize = SecCoreData.TemporaryRamSize - SecCoreData.PeiTemporaryRamSize;
- }
- DEBUG ((DEBUG_INFO, "Fsp BootFirmwareVolumeBase - 0x%x\n", SecCoreData.BootFirmwareVolumeBase));
- DEBUG ((DEBUG_INFO, "Fsp BootFirmwareVolumeSize - 0x%x\n", SecCoreData.BootFirmwareVolumeSize));
- DEBUG ((DEBUG_INFO, "Fsp TemporaryRamBase - 0x%x\n", SecCoreData.TemporaryRamBase));
- DEBUG ((DEBUG_INFO, "Fsp TemporaryRamSize - 0x%x\n", SecCoreData.TemporaryRamSize));
- DEBUG ((DEBUG_INFO, "Fsp PeiTemporaryRamBase - 0x%x\n", SecCoreData.PeiTemporaryRamBase));
- DEBUG ((DEBUG_INFO, "Fsp PeiTemporaryRamSize - 0x%x\n", SecCoreData.PeiTemporaryRamSize));
- DEBUG ((DEBUG_INFO, "Fsp StackBase - 0x%x\n", SecCoreData.StackBase));
- DEBUG ((DEBUG_INFO, "Fsp StackSize - 0x%x\n", SecCoreData.StackSize));
- //
- // Call PeiCore Entry
- //
- PeiCore (&SecCoreData, mPeiSecPlatformInformationPpi);
- //
- // Should never be here
- //
- CpuDeadLoop ();
- }
- /**
- 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;
- UINTN HeapSize;
- UINTN StackSize;
- UINTN CurrentStack;
- UINTN FspStackBase;
- //
- // Override OnSeparateStack to 1 because this function will switch stack to permanent memory
- // which makes FSP running on different stack from bootloader temporary ram stack.
- //
- GetFspGlobalDataPointer ()->OnSeparateStack = 1;
- if (PcdGet8 (PcdFspHeapSizePercentage) == 0) {
- CurrentStack = AsmReadStackPointer ();
- FspStackBase = (UINTN)GetFspEntryStack ();
- StackSize = FspStackBase - CurrentStack;
- HeapSize = CopySize;
- OldHeap = (VOID *)(UINTN)TemporaryMemoryBase;
- NewHeap = (VOID *)((UINTN)PermanentMemoryBase);
- OldStack = (VOID *)CurrentStack;
- //
- // The old stack is copied at the end of the stack region because stack grows down.
- //
- NewStack = (VOID *)((UINTN)PermanentMemoryBase - StackSize);
- } else {
- HeapSize = CopySize * PcdGet8 (PcdFspHeapSizePercentage) / 100;
- StackSize = CopySize - HeapSize;
- OldHeap = (VOID *)(UINTN)TemporaryMemoryBase;
- NewHeap = (VOID *)((UINTN)PermanentMemoryBase + StackSize);
- OldStack = (VOID *)((UINTN)TemporaryMemoryBase + HeapSize);
- NewStack = (VOID *)(UINTN)PermanentMemoryBase;
- }
- //
- // Migrate Heap
- //
- CopyMem (NewHeap, OldHeap, HeapSize);
- //
- // Migrate Stack
- //
- CopyMem (NewStack, OldStack, StackSize);
- //
- // 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);
- //
- // Fixed the FSP data pointer
- //
- FspDataPointerFixUp ((UINTN)NewStack - (UINTN)OldStack);
- //
- // 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 (
- (UINTN)OldStack,
- (UINTN)NewStack
- );
- return EFI_SUCCESS;
- }
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