1 /** @file 2 3 A hook-in library for MdeModulePkg/Universal/SmbiosDxe, in order to set 4 gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion (and possibly other PCDs) 5 just before SmbiosDxe consumes them. 6 7 Copyright (C) 2013, 2015, Red Hat, Inc. 8 Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR> 9 10 This program and the accompanying materials are licensed and made available 11 under the terms and conditions of the BSD License which accompanies this 12 distribution. The full text of the license may be found at 13 http://opensource.org/licenses/bsd-license.php 14 15 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT 16 WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 17 18 **/ 19 20 #include <IndustryStandard/SmBios.h> 21 22 #include <Base.h> 23 #include <Library/BaseMemoryLib.h> 24 #include <Library/DebugLib.h> 25 #include <Library/PcdLib.h> 26 #include <Library/QemuFwCfgLib.h> 27 28 typedef union { 29 SMBIOS_TABLE_ENTRY_POINT V2; 30 SMBIOS_TABLE_3_0_ENTRY_POINT V3; 31 } QEMU_SMBIOS_ANCHOR; 32 33 RETURN_STATUS 34 EFIAPI 35 DetectSmbiosVersion ( 36 VOID 37 ) 38 { 39 FIRMWARE_CONFIG_ITEM Anchor, Tables; 40 UINTN AnchorSize, TablesSize; 41 QEMU_SMBIOS_ANCHOR QemuAnchor; 42 UINT16 SmbiosVersion; 43 RETURN_STATUS PcdStatus; 44 45 if (PcdGetBool (PcdQemuSmbiosValidated)) { 46 // 47 // Some other module, linked against this library, has already performed 48 // the task at hand. This should never happen, but it's easy to handle; 49 // just exit early. 50 // 51 return RETURN_SUCCESS; 52 } 53 54 if (RETURN_ERROR (QemuFwCfgFindFile ( 55 "etc/smbios/smbios-anchor", &Anchor, &AnchorSize)) || 56 RETURN_ERROR (QemuFwCfgFindFile ( 57 "etc/smbios/smbios-tables", &Tables, &TablesSize)) || 58 TablesSize == 0) { 59 return RETURN_SUCCESS; 60 } 61 62 QemuFwCfgSelectItem (Anchor); 63 64 switch (AnchorSize) { 65 case sizeof QemuAnchor.V2: 66 QemuFwCfgReadBytes (AnchorSize, &QemuAnchor); 67 68 if (QemuAnchor.V2.MajorVersion != 2 || 69 QemuAnchor.V2.TableLength != TablesSize || 70 CompareMem (QemuAnchor.V2.AnchorString, "_SM_", 4) != 0 || 71 CompareMem (QemuAnchor.V2.IntermediateAnchorString, "_DMI_", 5) != 0) { 72 return RETURN_SUCCESS; 73 } 74 SmbiosVersion = (UINT16)(QemuAnchor.V2.MajorVersion << 8 | 75 QemuAnchor.V2.MinorVersion); 76 break; 77 78 case sizeof QemuAnchor.V3: 79 QemuFwCfgReadBytes (AnchorSize, &QemuAnchor); 80 81 if (QemuAnchor.V3.MajorVersion != 3 || 82 QemuAnchor.V3.TableMaximumSize != TablesSize || 83 CompareMem (QemuAnchor.V3.AnchorString, "_SM3_", 5) != 0) { 84 return RETURN_SUCCESS; 85 } 86 SmbiosVersion = (UINT16)(QemuAnchor.V3.MajorVersion << 8 | 87 QemuAnchor.V3.MinorVersion); 88 89 DEBUG ((EFI_D_INFO, "%a: SMBIOS 3.x DocRev from QEMU: 0x%02x\n", 90 __FUNCTION__, QemuAnchor.V3.DocRev)); 91 PcdStatus = PcdSet8S (PcdSmbiosDocRev, QemuAnchor.V3.DocRev); 92 ASSERT_RETURN_ERROR (PcdStatus); 93 break; 94 95 default: 96 return RETURN_SUCCESS; 97 } 98 99 DEBUG ((EFI_D_INFO, "%a: SMBIOS version from QEMU: 0x%04x\n", __FUNCTION__, 100 SmbiosVersion)); 101 PcdStatus = PcdSet16S (PcdSmbiosVersion, SmbiosVersion); 102 ASSERT_RETURN_ERROR (PcdStatus); 103 104 // 105 // SMBIOS platform drivers can now fetch and install 106 // "etc/smbios/smbios-tables" from QEMU. 107 // 108 PcdStatus = PcdSetBoolS (PcdQemuSmbiosValidated, TRUE); 109 ASSERT_RETURN_ERROR (PcdStatus); 110 return RETURN_SUCCESS; 111 } 112
