audk/UefiCpuPkg/SecCore/SecMain.c

/** @file
  C functions in SEC

  Copyright (c) 2008 - 2015, 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"

EFI_PEI_TEMPORARY_RAM_DONE_PPI gSecTemporaryRamDonePpi = {
  SecTemporaryRamDone
};

EFI_SEC_PLATFORM_INFORMATION_PPI  mSecPlatformInformationPpi = { SecPlatformInformation };

EFI_PEI_PPI_DESCRIPTOR            mPeiSecPlatformInformationPpi[] = {
  {
    EFI_PEI_PPI_DESCRIPTOR_PPI,
    &gEfiTemporaryRamDonePpiGuid,
    &gSecTemporaryRamDonePpi
  },
  {
    (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
    &gEfiSecPlatformInformationPpiGuid,
    &mSecPlatformInformationPpi
  }
};

//
// 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
NORETURN
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 SizeOfRam           Size of the temporary memory available for use.
  @param TempRamBase         Base address of temporary ram
  @param 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;
  EFI_STATUS                  Status;

  //
  // Report Status Code to indicate entering SEC core
  //
  REPORT_STATUS_CODE (
    EFI_PROGRESS_CODE,
    EFI_SOFTWARE_SEC | EFI_SW_SEC_PC_ENTRY_POINT
    );

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

  ASSERT (PeiStackSize < SizeOfRam);

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

  //
  // 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);

  //
  // Setup the default exception handlers
  //
  Status = InitializeCpuExceptionHandlers (NULL);
  ASSERT_EFI_ERROR (Status);

  //
  // 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)(0x100000000ULL - (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;

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

/**
  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
NORETURN
EFIAPI
SecStartupPhase2(
  IN VOID                     *Context
  )
{
  EFI_SEC_PEI_HAND_OFF        *SecCoreData;
  EFI_PEI_PPI_DESCRIPTOR      *PpiList;
  UINT32                      Index;
  EFI_PEI_PPI_DESCRIPTOR      *AllSecPpiList;
  EFI_PEI_CORE_ENTRY_POINT    PeiCoreEntryPoint;

  SecCoreData   = (EFI_SEC_PEI_HAND_OFF *) Context;
  AllSecPpiList = (EFI_PEI_PPI_DESCRIPTOR *) SecCoreData->PeiTemporaryRamBase;
  //
  // 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 ();
  }

  //
  // Perform platform specific initialization before entering PeiCore.
  //
  PpiList = SecPlatformMain (SecCoreData);
  if (PpiList != NULL) {
    //
    // Remove the terminal flag from the terminal PPI
    //
    CopyMem (AllSecPpiList, mPeiSecPlatformInformationPpi, sizeof (mPeiSecPlatformInformationPpi));
    Index = sizeof (mPeiSecPlatformInformationPpi) / sizeof (EFI_PEI_PPI_DESCRIPTOR) - 1;
    AllSecPpiList[Index].Flags = AllSecPpiList[Index].Flags & (~EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST);

    //
    // Append the platform additional PPI list
    //
    Index += 1;
    while (((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++;
    }

    //
    // Add the terminal PPI
    //
    CopyMem (&AllSecPpiList[Index ++], PpiList, sizeof (EFI_PEI_PPI_DESCRIPTOR));

    //
    // Set PpiList to the total PPI
    //
    PpiList = AllSecPpiList;

    //
    // Adjust PEI TEMP RAM Range.
    //
    ASSERT (SecCoreData->PeiTemporaryRamSize > Index * sizeof (EFI_PEI_PPI_DESCRIPTOR));
    SecCoreData->PeiTemporaryRamBase = (VOID *)((UINTN) SecCoreData->PeiTemporaryRamBase + Index * sizeof (EFI_PEI_PPI_DESCRIPTOR));
    SecCoreData->PeiTemporaryRamSize = SecCoreData->PeiTemporaryRamSize - Index * sizeof (EFI_PEI_PPI_DESCRIPTOR);
  } else {
    //
    // No addition PPI, PpiList directly point to the common PPI list.
    //
    PpiList = &mPeiSecPlatformInformationPpi[0];
  }

  //
  // Report Status Code to indicate transferring to PEI core
  //
  REPORT_STATUS_CODE (
    EFI_PROGRESS_CODE,
    EFI_SOFTWARE_SEC | EFI_SW_SEC_PC_HANDOFF_TO_NEXT
    );

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

  //
  // Should not come here.
  //
  UNREACHABLE ();
}

/**
  TemporaryRamDone() disables the use of Temporary RAM. If present, this service is invoked
  by the PEI Foundation after the EFI_PEI_PERMANANT_MEMORY_INSTALLED_PPI is installed.

  @retval EFI_SUCCESS           Use of Temporary RAM was disabled.
  @retval EFI_INVALID_PARAMETER Temporary RAM could not be disabled.

**/
EFI_STATUS
EFIAPI
SecTemporaryRamDone (
  VOID
  )
{
  BOOLEAN  State;

  //
  // Republish Sec Platform Information(2) PPI
  //
  RepublishSecPlatformInformationPpi ();

  //
  // Migrate DebugAgentContext.
  //
  InitializeDebugAgent (DEBUG_AGENT_INIT_POSTMEM_SEC, NULL, NULL);

  //
  // Disable interrupts and save current interrupt state
  //
  State = SaveAndDisableInterrupts();

  //
  // Disable Temporary RAM after Stack and Heap have been migrated at this point.
  //
  SecPlatformDisableTemporaryMemory ();

  //
  // Restore original interrupt state
  //
  SetInterruptState (State);

  return EFI_SUCCESS;
}