UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/SmmProfileArch.c

   1 /** @file
   2 IA-32 processor specific functions to enable SMM profile.
   3
   4 Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "PiSmmCpuDxeSmm.h"
  16 #include "SmmProfileInternal.h"
  17
  18 /**
  19   Create SMM page table for S3 path.
  20
  21 **/
  22 VOID
  23 InitSmmS3Cr3 (
  24   VOID
  25   )
  26 {
  27   mSmmS3ResumeState->SmmS3Cr3 = Gen4GPageTable (TRUE);
  28
  29   return ;
  30 }
  31
  32 /**
  33   Allocate pages for creating 4KB-page based on 2MB-page when page fault happens.
  34   32-bit firmware does not need it.
  35
  36 **/
  37 VOID
  38 InitPagesForPFHandler (
  39   VOID
  40   )
  41 {
  42 }
  43
  44 /**
  45   Update page table to map the memory correctly in order to make the instruction
  46   which caused page fault execute successfully. And it also save the original page
  47   table to be restored in single-step exception. 32-bit firmware does not need it.
  48
  49   @param  PageTable           PageTable Address.
  50   @param  PFAddress           The memory address which caused page fault exception.
  51   @param  CpuIndex            The index of the processor.
  52   @param  ErrorCode           The Error code of exception.
  53   @param  IsValidPFAddress    The flag indicates if SMM profile data need be added.
  54
  55 **/
  56 VOID
  57 RestorePageTableAbove4G (
  58   UINT64        *PageTable,
  59   UINT64        PFAddress,
  60   UINTN         CpuIndex,
  61   UINTN         ErrorCode,
  62   BOOLEAN       *IsValidPFAddress
  63   )
  64 {
  65 }
  66
  67 /**
  68   Clear TF in FLAGS.
  69
  70   @param  SystemContext    A pointer to the processor context when
  71                            the interrupt occurred on the processor.
  72
  73 **/
  74 VOID
  75 ClearTrapFlag (
  76   IN OUT EFI_SYSTEM_CONTEXT   SystemContext
  77   )
  78 {
  79   SystemContext.SystemContextIa32->Eflags &= (UINTN) ~BIT8;
  80 }