system76-edk2/IntelFspWrapperPkg/FspWrapperSecCore/SecMain.c

/** @file
  C functions in SEC

  Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/


#include "SecMain.h"

EFI_PEI_PPI_DESCRIPTOR            mPeiSecMainPpi[] = {
  {
    EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
    &gTopOfTemporaryRamPpiGuid,
    NULL // To be patched later.
  },
};

//
// These are IDT entries pointing to 10:FFFFFFE4h.
//
UINT64  mIdtEntryTemplate = 0xffff8e000010ffe4ULL;

/**
  Caller provided function to be invoked at the end of InitializeDebugAgent().

  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] Context    The first input parameter of InitializeDebugAgent().

**/
VOID
EFIAPI
SecStartupPhase2(
  IN VOID                     *Context
  );


/**

  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.
**/
VOID
EFIAPI
SecStartup (
  IN UINT32                   SizeOfRam,
  IN UINT32                   TempRamBase,
  IN VOID                     *BootFirmwareVolume
  )
{
  EFI_SEC_PEI_HAND_OFF        SecCoreData;
  IA32_DESCRIPTOR             IdtDescriptor;
  SEC_IDT_TABLE               IdtTableInStack;
  UINT32                      Index;
  UINT32                      PeiStackSize;

  PeiStackSize = PcdGet32 (PcdPeiTemporaryRamStackSize);
  if (PeiStackSize == 0) {
    PeiStackSize = (SizeOfRam >> 1);
  }

  ASSERT (PeiStackSize < SizeOfRam);

  //
  // Process all libraries constructor function linked to SecCore.
  //
  ProcessLibraryConstructorList ();

  DEBUG ((DEBUG_INFO, "SecCore - SecStartup\n"));

  //
  // Initialize floating point operating environment
  // to be compliant with UEFI spec.
  //
  InitializeFloatingPointUnits ();


  // |-------------------|---->
  // |Idt Table          |
  // |-------------------|
  // |PeiService Pointer |    PeiStackSize
  // |-------------------|
  // |                   |
  // |      Stack        |
  // |-------------------|---->
  // |                   |
  // |                   |
  // |      Heap         |    PeiTemporayRamSize
  // |                   |
  // |                   |
  // |-------------------|---->  TempRamBase

  IdtTableInStack.PeiService = 0;
  for (Index = 0; Index < SEC_IDT_ENTRY_COUNT; Index ++) {
    CopyMem ((VOID*)&IdtTableInStack.IdtTable[Index], (VOID*)&mIdtEntryTemplate, sizeof (UINT64));
  }

  IdtDescriptor.Base  = (UINTN) &IdtTableInStack.IdtTable;
  IdtDescriptor.Limit = (UINT16)(sizeof (IdtTableInStack.IdtTable) - 1);

  AsmWriteIdtr (&IdtDescriptor);

  //
  // Update the base address and length of Pei temporary memory
  //
  SecCoreData.DataSize               = (UINT16) sizeof (EFI_SEC_PEI_HAND_OFF);
  SecCoreData.BootFirmwareVolumeBase = BootFirmwareVolume;
  SecCoreData.BootFirmwareVolumeSize = (UINTN)(SIZE_4GB - (UINTN) BootFirmwareVolume);
  SecCoreData.TemporaryRamBase       = (VOID*)(UINTN) TempRamBase;
  SecCoreData.TemporaryRamSize       = SizeOfRam;
  SecCoreData.PeiTemporaryRamBase    = SecCoreData.TemporaryRamBase;
  SecCoreData.PeiTemporaryRamSize    = SizeOfRam - PeiStackSize;
  SecCoreData.StackBase              = (VOID*)(UINTN)(TempRamBase + SecCoreData.PeiTemporaryRamSize);
  SecCoreData.StackSize              = PeiStackSize;

  DEBUG ((DEBUG_INFO, "BootFirmwareVolumeBase - 0x%x\n", SecCoreData.BootFirmwareVolumeBase));
  DEBUG ((DEBUG_INFO, "BootFirmwareVolumeSize - 0x%x\n", SecCoreData.BootFirmwareVolumeSize));
  DEBUG ((DEBUG_INFO, "TemporaryRamBase       - 0x%x\n", SecCoreData.TemporaryRamBase));
  DEBUG ((DEBUG_INFO, "TemporaryRamSize       - 0x%x\n", SecCoreData.TemporaryRamSize));
  DEBUG ((DEBUG_INFO, "PeiTemporaryRamBase    - 0x%x\n", SecCoreData.PeiTemporaryRamBase));
  DEBUG ((DEBUG_INFO, "PeiTemporaryRamSize    - 0x%x\n", SecCoreData.PeiTemporaryRamSize));
  DEBUG ((DEBUG_INFO, "StackBase              - 0x%x\n", SecCoreData.StackBase));
  DEBUG ((DEBUG_INFO, "StackSize              - 0x%x\n", SecCoreData.StackSize));

  //
  // Initialize Debug Agent to support source level debug in SEC/PEI phases before memory ready.
  //
  InitializeDebugAgent (DEBUG_AGENT_INIT_PREMEM_SEC, &SecCoreData, SecStartupPhase2);

}

/**
  This API patch the TopOfTemporaryRam value in SecPpiList.

  @param[in,out] SecPpiList           PPI list to be patched.
  @param[in]     TopOfTemporaryRam    The top of CAR.

**/
VOID
PatchTopOfTemporaryRamPpi (
  IN OUT EFI_PEI_PPI_DESCRIPTOR *SecPpiList,
  IN VOID                       *TopOfTemporaryRam
  )
{
  SecPpiList[0].Ppi = TopOfTemporaryRam;
}

/**
  Caller provided function to be invoked at the end of InitializeDebugAgent().

  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] Context    The first input parameter of InitializeDebugAgent().

**/
VOID
EFIAPI
SecStartupPhase2(
  IN VOID                     *Context
  )
{
  EFI_SEC_PEI_HAND_OFF        *SecCoreData;
  EFI_PEI_PPI_DESCRIPTOR      *PpiList;
  UINT32                      Index;
  EFI_PEI_PPI_DESCRIPTOR      LocalSecPpiList[sizeof(mPeiSecMainPpi)/sizeof(mPeiSecMainPpi[0])];
  EFI_PEI_PPI_DESCRIPTOR      AllSecPpiList[FixedPcdGet32(PcdSecCoreMaxPpiSupported)];
  EFI_PEI_CORE_ENTRY_POINT    PeiCoreEntryPoint;

  SecCoreData = (EFI_SEC_PEI_HAND_OFF *) Context;
  //
  // Find Pei Core entry point. It will report SEC and Pei Core debug information if remote debug
  // is enabled.
  //
  FindAndReportEntryPoints ((EFI_FIRMWARE_VOLUME_HEADER *) SecCoreData->BootFirmwareVolumeBase, &PeiCoreEntryPoint);
  if (PeiCoreEntryPoint == NULL)
  {
    CpuDeadLoop ();
  }

  CopyMem (LocalSecPpiList, mPeiSecMainPpi, sizeof(mPeiSecMainPpi));
  PatchTopOfTemporaryRamPpi (LocalSecPpiList, (VOID *)((UINTN)SecCoreData->TemporaryRamBase + SecCoreData->TemporaryRamSize));

  //
  // Perform platform specific initialization before entering PeiCore.
  //
  PpiList = SecPlatformMain (SecCoreData);
  if (PpiList != NULL) {
    //
    // Remove the terminal flag from the terminal Ppi
    //
    CopyMem (AllSecPpiList, LocalSecPpiList, sizeof (LocalSecPpiList));
    for (Index = 0; Index < PcdGet32 (PcdSecCoreMaxPpiSupported); Index ++) {
      if ((AllSecPpiList[Index].Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) == EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
        break;
      }
    }
    AllSecPpiList[Index].Flags = AllSecPpiList[Index].Flags & (~EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST);

    //
    // Append the platform additional Ppi list
    //
    Index += 1;
    while (Index < PcdGet32 (PcdSecCoreMaxPpiSupported) &&
           ((PpiList->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) != EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST)) {
      CopyMem (&AllSecPpiList[Index], PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR));
      Index++;
      PpiList++;
    }

    //
    // Check whether the total Ppis exceeds the max supported Ppi.
    //
    if (Index >= PcdGet32 (PcdSecCoreMaxPpiSupported)) {
      //
      // the total Ppi is larger than the supported Max
      // PcdSecCoreMaxPpiSupported can be enlarged to solve it.
      //
      CpuDeadLoop ();
    } else {
      //
      // Add the terminal Ppi
      //
      CopyMem (&AllSecPpiList[Index], PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR));
    }

    //
    // Set PpiList to the total Ppi
    //
    PpiList = &AllSecPpiList[0];
  } else {
    //
    // No addition Ppi, PpiList directly point to the common Ppi list.
    //
    PpiList = &LocalSecPpiList[0];
  }

  //
  // Transfer the control to the PEI core
  //
  ASSERT (PeiCoreEntryPoint != NULL);
  (*PeiCoreEntryPoint) (SecCoreData, PpiList);

  //
  // Should not come here.
  //
  return ;
}