IntelFrameworkModulePkg/Universal/Acpi/AcpiS3SaveDxe/AcpiS3Save.c

   1 /** @file
   2   This is an implementation of the ACPI S3 Save protocol.  This is defined in
   3   S3 boot path specification 0.9.
   4
   5 Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
   6
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include <PiDxe.h>
  12 #include <Library/BaseMemoryLib.h>
  13 #include <Library/UefiBootServicesTableLib.h>
  14 #include <Library/PcdLib.h>
  15 #include <Library/DebugLib.h>
  16 #include <Protocol/AcpiS3Save.h>
  17
  18 #include "AcpiS3Save.h"
  19
  20 /**
  21   Hook point for AcpiVariableThunkPlatform for InstallAcpiS3Save.
  22 **/
  23 VOID
  24 InstallAcpiS3SaveThunk (
  25   VOID
  26   );
  27
  28 /**
  29   Hook point for AcpiVariableThunkPlatform for S3Ready.
  30
  31 **/
  32 VOID
  33 S3ReadyThunkPlatform (
  34   VOID
  35   );
  36
  37 UINTN     mLegacyRegionSize;
  38
  39 EFI_ACPI_S3_SAVE_PROTOCOL mS3Save = {
  40   LegacyGetS3MemorySize,
  41   S3Ready,
  42 };
  43
  44 /**
  45   Allocate memory below 4G memory address.
  46
  47   This function allocates memory below 4G memory address.
  48
  49   @param  MemoryType   Memory type of memory to allocate.
  50   @param  Size         Size of memory to allocate.
  51
  52   @return Allocated address for output.
  53
  54 **/
  55 VOID*
  56 AllocateMemoryBelow4G (
  57   IN EFI_MEMORY_TYPE    MemoryType,
  58   IN UINTN              Size
  59   )
  60 {
  61   UINTN                 Pages;
  62   EFI_PHYSICAL_ADDRESS  Address;
  63   EFI_STATUS            Status;
  64   VOID*                 Buffer;
  65
  66   Pages = EFI_SIZE_TO_PAGES (Size);
  67   Address = 0xffffffff;
  68
  69   Status  = gBS->AllocatePages (
  70                    AllocateMaxAddress,
  71                    MemoryType,
  72                    Pages,
  73                    &Address
  74                    );
  75   ASSERT_EFI_ERROR (Status);
  76
  77   Buffer = (VOID *) (UINTN) Address;
  78   ZeroMem (Buffer, Size);
  79
  80   return Buffer;
  81 }
  82
  83 /**
  84   Gets the buffer of legacy memory below 1 MB
  85   This function is to get the buffer in legacy memory below 1MB that is required during S3 resume.
  86
  87   @param This           A pointer to the EFI_ACPI_S3_SAVE_PROTOCOL instance.
  88   @param Size           The returned size of legacy memory below 1 MB.
  89
  90   @retval EFI_SUCCESS           Size is successfully returned.
  91   @retval EFI_INVALID_PARAMETER The pointer Size is NULL.
  92
  93 **/
  94 EFI_STATUS
  95 EFIAPI
  96 LegacyGetS3MemorySize (
  97   IN  EFI_ACPI_S3_SAVE_PROTOCOL   *This,
  98   OUT UINTN                       *Size
  99   )
 100 {
 101   if (Size == NULL) {
 102     return EFI_INVALID_PARAMETER;
 103   }
 104
 105   *Size = mLegacyRegionSize;
 106   return EFI_SUCCESS;
 107 }
 108
 109 /**
 110   Prepares all information that is needed in the S3 resume boot path.
 111
 112   Allocate the resources or prepare informations and save in ACPI variable set for S3 resume boot path
 113
 114   @param This                 A pointer to the EFI_ACPI_S3_SAVE_PROTOCOL instance.
 115   @param LegacyMemoryAddress  The base address of legacy memory.
 116
 117   @retval EFI_NOT_FOUND         Some necessary information cannot be found.
 118   @retval EFI_SUCCESS           All information was saved successfully.
 119   @retval EFI_OUT_OF_RESOURCES  Resources were insufficient to save all the information.
 120   @retval EFI_INVALID_PARAMETER The memory range is not located below 1 MB.
 121
 122 **/
 123 EFI_STATUS
 124 EFIAPI
 125 S3Ready (
 126   IN EFI_ACPI_S3_SAVE_PROTOCOL    *This,
 127   IN VOID                         *LegacyMemoryAddress
 128   )
 129 {
 130   STATIC BOOLEAN                  AlreadyEntered;
 131
 132   DEBUG ((EFI_D_INFO, "S3Ready!\n"));
 133
 134   //
 135   // Platform may invoke AcpiS3Save->S3Save() before ExitPmAuth, because we need save S3 information there, while BDS ReadyToBoot may invoke it again.
 136   // So if 2nd S3Save() is triggered later, we need ignore it.
 137   //
 138   if (AlreadyEntered) {
 139     return EFI_SUCCESS;
 140   }
 141   AlreadyEntered = TRUE;
 142
 143   return EFI_SUCCESS;
 144 }
 145
 146 /**
 147   The Driver Entry Point.
 148
 149   The function is the driver Entry point which will produce AcpiS3SaveProtocol.
 150
 151   @param ImageHandle   A handle for the image that is initializing this driver
 152   @param SystemTable   A pointer to the EFI system table
 153
 154   @retval EFI_SUCCESS               Driver initialized successfully
 155   @retval EFI_UNSUPPORTED           Do not support ACPI S3
 156   @retval EFI_OUT_OF_RESOURCES      Could not allocate needed resources
 157
 158 **/
 159 EFI_STATUS
 160 EFIAPI
 161 InstallAcpiS3Save (
 162   IN EFI_HANDLE           ImageHandle,
 163   IN EFI_SYSTEM_TABLE     *SystemTable
 164   )
 165 {
 166   EFI_STATUS        Status;
 167
 168   if (!PcdGetBool (PcdAcpiS3Enable)) {
 169     return EFI_UNSUPPORTED;
 170   }
 171
 172   if (!FeaturePcdGet(PcdPlatformCsmSupport)) {
 173     //
 174     // More memory for no CSM tip, because GDT need relocation
 175     //
 176     mLegacyRegionSize = 0x250;
 177   } else {
 178     mLegacyRegionSize = 0x100;
 179   }
 180
 181   Status = gBS->InstallProtocolInterface (
 182                   &ImageHandle,
 183                   &gEfiAcpiS3SaveProtocolGuid,
 184                   EFI_NATIVE_INTERFACE,
 185                   &mS3Save
 186                   );
 187   ASSERT_EFI_ERROR (Status);
 188   return Status;
 189 }