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