PrePi.c

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#include <PiPei.h>
#include <Pi/PiBootMode.h>
 
#include <Library/PeCoffLib.h>
#include <Library/PrePiLib.h>
#include <Library/PrintLib.h>
#include <Library/PrePiHobListPointerLib.h>
#include <Library/TimerLib.h>
#include <Library/PerformanceLib.h>
#include <Library/CacheMaintenanceLib.h>
 
#include <Ppi/GuidedSectionExtraction.h>
#include <Ppi/ArmMpCoreInfo.h>
 
#include "PrePi.h"
 
VOID
PrePiMain (
  IN  UINTN   UefiMemoryBase,
  IN  UINTN   StacksBase,
  IN  UINT64  StartTimeStamp
  )
{
  EFI_HOB_HANDOFF_INFO_TABLE  *HobList;
  EFI_STATUS                  Status;
  CHAR8                       Buffer[100];
  UINTN                       CharCount;
  UINTN                       StacksSize;
 
  // Initialize the architecture specific bits
  ArchInitialize ();
 
  // Declare the PI/UEFI memory region
  HobList = HobConstructor (
              (VOID *)UefiMemoryBase,
              FixedPcdGet32 (PcdSystemMemoryUefiRegionSize),
              (VOID *)UefiMemoryBase,
              (VOID *)StacksBase // The top of the UEFI Memory is reserved for the stacks
              );
  PrePeiSetHobList (HobList);
 
  //
  // Ensure that the loaded image is invalidated in the caches, so that any
  // modifications we made with the caches and MMU off (such as the applied
  // relocations) don't become invisible once we turn them on.
  //
  InvalidateDataCacheRange ((VOID *)(UINTN)PcdGet64 (PcdFdBaseAddress), PcdGet32 (PcdFdSize));
 
  // SEC phase needs to run library constructors by hand.
  ProcessLibraryConstructorList ();
 
  // Initialize MMU and Memory HOBs (Resource Descriptor HOBs)
  Status = MemoryPeim (UefiMemoryBase, FixedPcdGet32 (PcdSystemMemoryUefiRegionSize));
  ASSERT_EFI_ERROR (Status);
 
  // Initialize the Serial Port
  SerialPortInitialize ();
  CharCount = AsciiSPrint (
                Buffer,
                sizeof (Buffer),
                "UEFI firmware (version %s built at %a on %a)\n\r",
                (CHAR16 *)PcdGetPtr (PcdFirmwareVersionString),
                __TIME__,
                __DATE__
                );
  SerialPortWrite ((UINT8 *)Buffer, CharCount);
 
  // Create the Stacks HOB (reserve the memory for all stacks)
  StacksSize = PcdGet32 (PcdCPUCorePrimaryStackSize);
  BuildStackHob (StacksBase, StacksSize);
 
  // TODO: Call CpuPei as a library
  BuildCpuHob (ArmGetPhysicalAddressBits (), PcdGet8 (PcdPrePiCpuIoSize));
 
  // Set the Boot Mode
  SetBootMode (BOOT_WITH_FULL_CONFIGURATION);
 
  // Initialize Platform HOBs (CpuHob and FvHob)
  Status = PlatformPeim ();
  ASSERT_EFI_ERROR (Status);
 
  // Now, the HOB List has been initialized, we can register performance information
  PERF_START (NULL, "PEI", NULL, StartTimeStamp);
 
  // Assume the FV that contains the SEC (our code) also contains a compressed FV.
  Status = DecompressFirstFv ();
  ASSERT_EFI_ERROR (Status);
 
  // Load the DXE Core and transfer control to it
  Status = LoadDxeCoreFromFv (NULL, SIZE_128KB);
  ASSERT_EFI_ERROR (Status);
}
 
VOID
CEntryPoint (
  IN  UINTN  MpId,
  IN  UINTN  UefiMemoryBase,
  IN  UINTN  StacksBase
  )
{
  UINT64  StartTimeStamp;
 
  if (PerformanceMeasurementEnabled ()) {
    // We cannot call yet the PerformanceLib because the HOB List has not been initialized
    StartTimeStamp = GetPerformanceCounter ();
  } else {
    StartTimeStamp = 0;
  }
 
  // Data Cache enabled on Primary core when MMU is enabled.
  ArmDisableDataCache ();
  // Invalidate instruction cache
  ArmInvalidateInstructionCache ();
  // Enable Instruction Caches on all cores.
  ArmEnableInstructionCache ();
 
  PrePiMain (UefiMemoryBase, StacksBase, StartTimeStamp);
 
  // DXE Core should always load and never return
  ASSERT (FALSE);
}
 
VOID
RelocatePeCoffImage (
  IN  EFI_PEI_FV_HANDLE         FwVolHeader,
  IN  PE_COFF_LOADER_READ_FILE  ImageRead
  )
{
  EFI_PEI_FILE_HANDLE           FileHandle;
  VOID                          *SectionData;
  PE_COFF_LOADER_IMAGE_CONTEXT  ImageContext;
  EFI_STATUS                    Status;
 
  FileHandle = NULL;
  Status     = FfsFindNextFile (
                 EFI_FV_FILETYPE_SECURITY_CORE,
                 FwVolHeader,
                 &FileHandle
                 );
  ASSERT_EFI_ERROR (Status);
 
  Status = FfsFindSectionData (EFI_SECTION_PE32, FileHandle, &SectionData);
  if (EFI_ERROR (Status)) {
    Status = FfsFindSectionData (EFI_SECTION_TE, FileHandle, &SectionData);
  }
 
  ASSERT_EFI_ERROR (Status);
 
  ZeroMem (&ImageContext, sizeof ImageContext);
 
  ImageContext.Handle    = (EFI_HANDLE)SectionData;
  ImageContext.ImageRead = ImageRead;
  PeCoffLoaderGetImageInfo (&ImageContext);
 
  if (ImageContext.ImageAddress != (UINTN)SectionData) {
    ImageContext.ImageAddress = (UINTN)SectionData;
    PeCoffLoaderRelocateImage (&ImageContext);
  }
}