1 | // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
2 | /****************************************************************************** |
3 | * |
4 | * Module Name: tbfind - find table |
5 | * |
6 | * Copyright (C) 2000 - 2023, Intel Corp. |
7 | * |
8 | *****************************************************************************/ |
9 | |
10 | #include <acpi/acpi.h> |
11 | #include "accommon.h" |
12 | #include "actables.h" |
13 | |
14 | #define _COMPONENT ACPI_TABLES |
15 | ACPI_MODULE_NAME("tbfind" ) |
16 | |
17 | /******************************************************************************* |
18 | * |
19 | * FUNCTION: acpi_tb_find_table |
20 | * |
21 | * PARAMETERS: signature - String with ACPI table signature |
22 | * oem_id - String with the table OEM ID |
23 | * oem_table_id - String with the OEM Table ID |
24 | * table_index - Where the table index is returned |
25 | * |
26 | * RETURN: Status and table index |
27 | * |
28 | * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the |
29 | * Signature, OEM ID and OEM Table ID. Returns an index that can |
30 | * be used to get the table header or entire table. |
31 | * |
32 | ******************************************************************************/ |
33 | acpi_status |
34 | acpi_tb_find_table(char *signature, |
35 | char *oem_id, char *oem_table_id, u32 *table_index) |
36 | { |
37 | acpi_status status = AE_OK; |
38 | struct acpi_table_header ; |
39 | u32 i; |
40 | |
41 | ACPI_FUNCTION_TRACE(tb_find_table); |
42 | |
43 | /* Validate the input table signature */ |
44 | |
45 | if (!acpi_ut_valid_nameseg(signature)) { |
46 | return_ACPI_STATUS(AE_BAD_SIGNATURE); |
47 | } |
48 | |
49 | /* Don't allow the OEM strings to be too long */ |
50 | |
51 | if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) || |
52 | (strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) { |
53 | return_ACPI_STATUS(AE_AML_STRING_LIMIT); |
54 | } |
55 | |
56 | /* Normalize the input strings */ |
57 | |
58 | memset(&header, 0, sizeof(struct acpi_table_header)); |
59 | ACPI_COPY_NAMESEG(header.signature, signature); |
60 | strncpy(p: header.oem_id, q: oem_id, ACPI_OEM_ID_SIZE); |
61 | strncpy(p: header.oem_table_id, q: oem_table_id, ACPI_OEM_TABLE_ID_SIZE); |
62 | |
63 | /* Search for the table */ |
64 | |
65 | (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); |
66 | for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { |
67 | if (memcmp(p: &(acpi_gbl_root_table_list.tables[i].signature), |
68 | q: header.signature, ACPI_NAMESEG_SIZE)) { |
69 | |
70 | /* Not the requested table */ |
71 | |
72 | continue; |
73 | } |
74 | |
75 | /* Table with matching signature has been found */ |
76 | |
77 | if (!acpi_gbl_root_table_list.tables[i].pointer) { |
78 | |
79 | /* Table is not currently mapped, map it */ |
80 | |
81 | status = |
82 | acpi_tb_validate_table(table_desc: &acpi_gbl_root_table_list. |
83 | tables[i]); |
84 | if (ACPI_FAILURE(status)) { |
85 | goto unlock_and_exit; |
86 | } |
87 | |
88 | if (!acpi_gbl_root_table_list.tables[i].pointer) { |
89 | continue; |
90 | } |
91 | } |
92 | |
93 | /* Check for table match on all IDs */ |
94 | |
95 | if (!memcmp |
96 | (p: acpi_gbl_root_table_list.tables[i].pointer->signature, |
97 | q: header.signature, ACPI_NAMESEG_SIZE) && (!oem_id[0] |
98 | || |
99 | !memcmp |
100 | (p: acpi_gbl_root_table_list. |
101 | tables[i]. |
102 | pointer->oem_id, |
103 | q: header.oem_id, |
104 | ACPI_OEM_ID_SIZE)) |
105 | && (!oem_table_id[0] |
106 | || !memcmp(p: acpi_gbl_root_table_list.tables[i].pointer-> |
107 | oem_table_id, q: header.oem_table_id, |
108 | ACPI_OEM_TABLE_ID_SIZE))) { |
109 | *table_index = i; |
110 | |
111 | ACPI_DEBUG_PRINT((ACPI_DB_TABLES, |
112 | "Found table [%4.4s]\n" , |
113 | header.signature)); |
114 | goto unlock_and_exit; |
115 | } |
116 | } |
117 | status = AE_NOT_FOUND; |
118 | |
119 | unlock_and_exit: |
120 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); |
121 | return_ACPI_STATUS(status); |
122 | } |
123 | |