OvmfPkg/SmbiosPlatformDxe/Qemu.c

   1 /** @file
   2   Find and extract QEMU SMBIOS data from fw_cfg.
   3
   4   Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7 **/
   8
   9 #include <Library/DebugLib.h>            // ASSERT_EFI_ERROR()
  10 #include <Library/MemoryAllocationLib.h> // AllocatePool()
  11 #include <Library/PcdLib.h>              // PcdGetBool()
  12 #include <Library/QemuFwCfgLib.h>        // QemuFwCfgFindFile()
  13
  14 #include "SmbiosPlatformDxe.h"
  15
  16 /**
  17   Locates and extracts the QEMU SMBIOS data if present in fw_cfg
  18
  19   @return                 Address of extracted QEMU SMBIOS data
  20
  21 **/
  22 UINT8 *
  23 GetQemuSmbiosTables (
  24   VOID
  25   )
  26 {
  27   EFI_STATUS            Status;
  28   FIRMWARE_CONFIG_ITEM  Tables;
  29   UINTN                 TablesSize;
  30   UINT8                 *QemuTables;
  31
  32   if (!PcdGetBool (PcdQemuSmbiosValidated)) {
  33     return NULL;
  34   }
  35
  36   Status = QemuFwCfgFindFile (
  37              "etc/smbios/smbios-tables",
  38              &Tables,
  39              &TablesSize
  40              );
  41   ASSERT_EFI_ERROR (Status);
  42   ASSERT (TablesSize > 0);
  43
  44   QemuTables = AllocatePool (TablesSize);
  45   if (QemuTables == NULL) {
  46     return NULL;
  47   }
  48
  49   QemuFwCfgSelectItem (Tables);
  50   QemuFwCfgReadBytes (TablesSize, QemuTables);
  51
  52   return QemuTables;
  53 }
  54
  55 /**
  56   Installs SMBIOS information for OVMF
  57
  58   @param ImageHandle     Module's image handle
  59   @param SystemTable     Pointer of EFI_SYSTEM_TABLE
  60
  61   @retval EFI_SUCCESS    Smbios data successfully installed
  62   @retval Other          Smbios data was not installed
  63
  64 **/
  65 EFI_STATUS
  66 EFIAPI
  67 SmbiosTablePublishEntry (
  68   IN EFI_HANDLE        ImageHandle,
  69   IN EFI_SYSTEM_TABLE  *SystemTable
  70   )
  71 {
  72   EFI_STATUS  Status;
  73   UINT8       *SmbiosTables;
  74
  75   Status = EFI_NOT_FOUND;
  76   //
  77   // Add QEMU SMBIOS data if found
  78   //
  79   SmbiosTables = GetQemuSmbiosTables ();
  80   if (SmbiosTables != NULL) {
  81     Status = InstallAllStructures (SmbiosTables);
  82     FreePool (SmbiosTables);
  83   }
  84
  85   return Status;
  86 }