projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| a145e28d GS |
1 | /** @file\r |
| 2 | Find and extract QEMU SMBIOS data from fw_cfg.\r | |
| 3 | \r | |
| 4 | Copyright (C) 2014, Gabriel L. Somlo <somlo@cmu.edu>\r | |
| 5 | \r | |
| 6 | This program and the accompanying materials are licensed and made\r | |
| 7 | available under the terms and conditions of the BSD License which\r | |
| 8 | accompanies this distribution. The full text of the license may\r | |
| 9 | be found at http://opensource.org/licenses/bsd-license.php\r | |
| 10 | \r | |
| 11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 13 | **/\r | |
| 14 | \r | |
| 15 | #include "SmbiosPlatformDxe.h"\r | |
| 16 | #include <Library/QemuFwCfgLib.h>\r | |
| 17 | #include <Library/MemoryAllocationLib.h>\r | |
| 18 | \r | |
| 19 | /**\r | |
| 20 | Locates and extracts the QEMU SMBIOS data if present in fw_cfg\r | |
| 21 | \r | |
| 22 | @return Address of extracted QEMU SMBIOS data\r | |
| 23 | \r | |
| 24 | **/\r | |
| 25 | UINT8 *\r | |
| 26 | GetQemuSmbiosTables (\r | |
| 27 | VOID\r | |
| 28 | )\r | |
| 29 | {\r | |
| 30 | SMBIOS_TABLE_ENTRY_POINT QemuAnchor;\r | |
| 31 | FIRMWARE_CONFIG_ITEM Anchor, Tables;\r | |
| 32 | UINTN AnchorSize, TablesSize;\r | |
| 33 | UINT8 *QemuTables;\r | |
| 34 | \r | |
| 35 | if (EFI_ERROR (QemuFwCfgFindFile (\r | |
| 36 | "etc/smbios/smbios-anchor", &Anchor, &AnchorSize)) ||\r | |
| 37 | EFI_ERROR (QemuFwCfgFindFile (\r | |
| 38 | "etc/smbios/smbios-tables", &Tables, &TablesSize)) ||\r | |
| 39 | AnchorSize != sizeof (QemuAnchor) ||\r | |
| 40 | TablesSize == 0) {\r | |
| 41 | return NULL;\r | |
| 42 | }\r | |
| 43 | \r | |
| 44 | //\r | |
| 45 | // We copy the entry point structure to perform some additional checks,\r | |
| 46 | // but discard it upon return.\r | |
| 47 | //\r | |
| 48 | QemuFwCfgSelectItem (Anchor);\r | |
| 49 | QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);\r | |
| 50 | \r | |
| 51 | if (AsciiStrnCmp ((CHAR8 *)QemuAnchor.AnchorString, "_SM_", 4) ||\r | |
| 52 | AsciiStrnCmp ((CHAR8 *)QemuAnchor.IntermediateAnchorString, "_DMI_", 5) ||\r | |
| 53 | TablesSize != QemuAnchor.TableLength) {\r | |
| 54 | return NULL;\r | |
| 55 | }\r | |
| 56 | \r | |
| 57 | QemuTables = AllocatePool (TablesSize);\r | |
| 58 | if (QemuTables == NULL) {\r | |
| 59 | return NULL;\r | |
| 60 | }\r | |
| 61 | \r | |
| 62 | QemuFwCfgSelectItem (Tables);\r | |
| 63 | QemuFwCfgReadBytes (TablesSize, QemuTables);\r | |
| 64 | \r | |
| 65 | return QemuTables;\r | |
| 66 | }\r |