Home | History | Annotate | Download | only in Ia32 
      1 /** @file
      2 IA-32 processor specific functions to enable SMM profile.
      3 
      4 Copyright (c) 2012 - 2015, 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 (0, 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 }
     81