projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| c1a00d09 SZ |
1 | /** @file\r |
| 2 | This module provides help function for finding ACPI table.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>\r | |
| 22a69a5e | 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| c1a00d09 SZ |
6 | \r |
| 7 | **/\r | |
| 8 | \r | |
| 9 | #include "UefiLibInternal.h"\r | |
| 10 | #include <IndustryStandard/Acpi.h>\r | |
| 11 | \r | |
| 12 | /**\r | |
| 13 | This function locates next ACPI table in XSDT/RSDT based on Signature and\r | |
| 14 | previous returned Table.\r | |
| 15 | \r | |
| 16 | If PreviousTable is NULL:\r | |
| 17 | This function will locate the first ACPI table in XSDT/RSDT based on\r | |
| 18 | Signature in gEfiAcpi20TableGuid system configuration table first, and then\r | |
| 19 | gEfiAcpi10TableGuid system configuration table.\r | |
| 20 | This function will locate in XSDT first, and then RSDT.\r | |
| 21 | For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in\r | |
| 22 | FADT.\r | |
| 23 | For FACS, this function will locate XFirmwareCtrl in FADT first, and then\r | |
| 24 | FirmwareCtrl in FADT.\r | |
| 25 | \r | |
| 26 | If PreviousTable is not NULL:\r | |
| 27 | 1. If it could be located in XSDT in gEfiAcpi20TableGuid system configuration\r | |
| 28 | table, then this function will just locate next table in XSDT in\r | |
| 29 | gEfiAcpi20TableGuid system configuration table.\r | |
| 30 | 2. If it could be located in RSDT in gEfiAcpi20TableGuid system configuration\r | |
| 31 | table, then this function will just locate next table in RSDT in\r | |
| 32 | gEfiAcpi20TableGuid system configuration table.\r | |
| 33 | 3. If it could be located in RSDT in gEfiAcpi10TableGuid system configuration\r | |
| 34 | table, then this function will just locate next table in RSDT in\r | |
| 35 | gEfiAcpi10TableGuid system configuration table.\r | |
| 36 | \r | |
| 37 | It's not supported that PreviousTable is not NULL but PreviousTable->Signature\r | |
| 38 | is not same with Signature, NULL will be returned.\r | |
| 39 | \r | |
| 40 | @param Signature ACPI table signature.\r | |
| 41 | @param PreviousTable Pointer to previous returned table to locate next\r | |
| 42 | table, or NULL to locate first table.\r | |
| 43 | \r | |
| 44 | @return Next ACPI table or NULL if not found.\r | |
| 45 | \r | |
| 46 | **/\r | |
| 47 | EFI_ACPI_COMMON_HEADER *\r | |
| 48 | EFIAPI\r | |
| 49 | EfiLocateNextAcpiTable (\r | |
| 50 | IN UINT32 Signature,\r | |
| 51 | IN EFI_ACPI_COMMON_HEADER *PreviousTable OPTIONAL\r | |
| 52 | )\r | |
| 53 | {\r | |
| 54 | ASSERT (FALSE);\r | |
| 55 | return NULL;\r | |
| 56 | }\r | |
| 57 | \r | |
| 58 | /**\r | |
| 59 | This function locates first ACPI table in XSDT/RSDT based on Signature.\r | |
| 60 | \r | |
| 61 | This function will locate the first ACPI table in XSDT/RSDT based on\r | |
| 62 | Signature in gEfiAcpi20TableGuid system configuration table first, and then\r | |
| 63 | gEfiAcpi10TableGuid system configuration table.\r | |
| 64 | This function will locate in XSDT first, and then RSDT.\r | |
| 65 | For DSDT, this function will locate XDsdt in FADT first, and then Dsdt in\r | |
| 66 | FADT.\r | |
| 67 | For FACS, this function will locate XFirmwareCtrl in FADT first, and then\r | |
| 68 | FirmwareCtrl in FADT.\r | |
| 69 | \r | |
| 70 | @param Signature ACPI table signature.\r | |
| 71 | \r | |
| 72 | @return First ACPI table or NULL if not found.\r | |
| 73 | \r | |
| 74 | **/\r | |
| 75 | EFI_ACPI_COMMON_HEADER *\r | |
| 76 | EFIAPI\r | |
| 77 | EfiLocateFirstAcpiTable (\r | |
| 78 | IN UINT32 Signature\r | |
| 79 | )\r | |
| 80 | {\r | |
| 81 | return EfiLocateNextAcpiTable (Signature, NULL);\r | |
| 82 | }\r |