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audk/IntelFsp2Pkg/FspSecCore/SecMain.c

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/** @file
Copyright (c) 2014 - 2019, 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 "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 UINT32 BootLoaderStack,
IN UINT32 ApiIdx
)
{
EFI_SEC_PEI_HAND_OFF SecCoreData;
IA32_DESCRIPTOR IdtDescriptor;
SEC_IDT_TABLE IdtTableInStack;
UINT32 Index;
FSP_GLOBAL_DATA PeiFspData;
UINT64 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 | PeiTemporayRamSize
// | |
// | |
// |-------------------|----> TempRamBase
IdtTableInStack.PeiService = NULL;
AsmReadIdtr (&IdtDescriptor);
if (IdtDescriptor.Base == 0) {
ExceptionHandler = FspGetExceptionHandler(mIdtEntryTemplate);
for (Index = 0; Index < FixedPcdGet8(PcdFspMaxInterruptSupported); Index ++) {
CopyMem ((VOID*)&IdtTableInStack.IdtTable[Index], (VOID*)&ExceptionHandler, sizeof (UINT64));
}
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;
SecCoreData.TemporaryRamBase = (VOID*)(UINTN) TempRamBase;
if (PcdGet8 (PcdFspHeapSizePercentage) == 0) {
SecCoreData.TemporaryRamSize = SizeOfRam; // stack size that is going to be copied to the permanent memory
SecCoreData.PeiTemporaryRamBase = SecCoreData.TemporaryRamBase;
SecCoreData.PeiTemporaryRamSize = SecCoreData.TemporaryRamSize;
SecCoreData.StackBase = (VOID *)GetFspEntryStack(); // Share the same boot loader stack
SecCoreData.StackSize = 0;
} else {
SecCoreData.TemporaryRamSize = SizeOfRam;
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;
if (PcdGet8 (PcdFspHeapSizePercentage) == 0) {
CurrentStack = AsmReadEsp();
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 (
(UINT32) (UINTN) OldStack,
(UINT32) (UINTN) NewStack
);
return EFI_SUCCESS;
}
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