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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: tbrsdt - ACPI RSDT table utilities | |
4 | * | |
5 | *****************************************************************************/ | |
6 | ||
7 | /* | |
4a90c7e8 | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
9 | * All rights reserved. |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions, and the following disclaimer, | |
16 | * without modification. | |
17 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
18 | * substantially similar to the "NO WARRANTY" disclaimer below | |
19 | * ("Disclaimer") and any redistribution must be conditioned upon | |
20 | * including a substantially similar Disclaimer requirement for further | |
21 | * binary redistribution. | |
22 | * 3. Neither the names of the above-listed copyright holders nor the names | |
23 | * of any contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * Alternatively, this software may be distributed under the terms of the | |
27 | * GNU General Public License ("GPL") version 2 as published by the Free | |
28 | * Software Foundation. | |
29 | * | |
30 | * NO WARRANTY | |
31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
32 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
33 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
34 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
35 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
36 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
37 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
38 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
39 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
40 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
41 | * POSSIBILITY OF SUCH DAMAGES. | |
42 | */ | |
43 | ||
1da177e4 LT |
44 | #include <acpi/acpi.h> |
45 | #include <acpi/actables.h> | |
46 | ||
1da177e4 | 47 | #define _COMPONENT ACPI_TABLES |
4be44fcd | 48 | ACPI_MODULE_NAME("tbrsdt") |
1da177e4 LT |
49 | |
50 | /******************************************************************************* | |
51 | * | |
52 | * FUNCTION: acpi_tb_verify_rsdp | |
53 | * | |
54 | * PARAMETERS: Address - RSDP (Pointer to RSDT) | |
55 | * | |
56 | * RETURN: Status | |
57 | * | |
58 | * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) | |
59 | * | |
60 | ******************************************************************************/ | |
4be44fcd | 61 | acpi_status acpi_tb_verify_rsdp(struct acpi_pointer *address) |
1da177e4 | 62 | { |
4be44fcd LB |
63 | struct acpi_table_desc table_info; |
64 | acpi_status status; | |
65 | struct rsdp_descriptor *rsdp; | |
1da177e4 | 66 | |
b229cf92 | 67 | ACPI_FUNCTION_TRACE(tb_verify_rsdp); |
1da177e4 LT |
68 | |
69 | switch (address->pointer_type) { | |
70 | case ACPI_LOGICAL_POINTER: | |
71 | ||
72 | rsdp = address->pointer.logical; | |
73 | break; | |
74 | ||
75 | case ACPI_PHYSICAL_POINTER: | |
76 | /* | |
77 | * Obtain access to the RSDP structure | |
78 | */ | |
4be44fcd LB |
79 | status = acpi_os_map_memory(address->pointer.physical, |
80 | sizeof(struct rsdp_descriptor), | |
4119532c | 81 | ACPI_CAST_PTR(void, &rsdp)); |
4be44fcd LB |
82 | if (ACPI_FAILURE(status)) { |
83 | return_ACPI_STATUS(status); | |
1da177e4 LT |
84 | } |
85 | break; | |
86 | ||
87 | default: | |
4be44fcd | 88 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
89 | } |
90 | ||
f9f4601f | 91 | /* Verify RSDP signature and checksum */ |
1da177e4 | 92 | |
4be44fcd LB |
93 | status = acpi_tb_validate_rsdp(rsdp); |
94 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
95 | goto cleanup; |
96 | } | |
97 | ||
4119532c | 98 | /* RSDP is ok. Init the table info */ |
1da177e4 | 99 | |
4be44fcd LB |
100 | table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp); |
101 | table_info.length = sizeof(struct rsdp_descriptor); | |
4119532c BM |
102 | |
103 | if (address->pointer_type == ACPI_PHYSICAL_POINTER) { | |
104 | table_info.allocation = ACPI_MEM_MAPPED; | |
105 | } else { | |
106 | table_info.allocation = ACPI_MEM_NOT_ALLOCATED; | |
107 | } | |
1da177e4 LT |
108 | |
109 | /* Save the table pointers and allocation info */ | |
110 | ||
b229cf92 | 111 | status = acpi_tb_init_table_descriptor(ACPI_TABLE_ID_RSDP, &table_info); |
4be44fcd | 112 | if (ACPI_FAILURE(status)) { |
1da177e4 LT |
113 | goto cleanup; |
114 | } | |
115 | ||
116 | /* Save the RSDP in a global for easy access */ | |
117 | ||
4be44fcd LB |
118 | acpi_gbl_RSDP = |
119 | ACPI_CAST_PTR(struct rsdp_descriptor, table_info.pointer); | |
120 | return_ACPI_STATUS(status); | |
1da177e4 LT |
121 | |
122 | /* Error exit */ | |
4be44fcd | 123 | cleanup: |
1da177e4 LT |
124 | |
125 | if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) { | |
4be44fcd | 126 | acpi_os_unmap_memory(rsdp, sizeof(struct rsdp_descriptor)); |
1da177e4 | 127 | } |
4be44fcd | 128 | return_ACPI_STATUS(status); |
1da177e4 LT |
129 | } |
130 | ||
1da177e4 LT |
131 | /******************************************************************************* |
132 | * | |
133 | * FUNCTION: acpi_tb_get_rsdt_address | |
134 | * | |
44f6c012 | 135 | * PARAMETERS: out_address - Where the address is returned |
1da177e4 | 136 | * |
44f6c012 | 137 | * RETURN: None, Address |
1da177e4 | 138 | * |
73459f73 RM |
139 | * DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the |
140 | * version of the RSDP and whether the XSDT pointer is valid | |
1da177e4 LT |
141 | * |
142 | ******************************************************************************/ | |
143 | ||
4be44fcd | 144 | void acpi_tb_get_rsdt_address(struct acpi_pointer *out_address) |
1da177e4 LT |
145 | { |
146 | ||
4be44fcd | 147 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 148 | |
4be44fcd LB |
149 | out_address->pointer_type = |
150 | acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING; | |
1da177e4 | 151 | |
73459f73 RM |
152 | /* Use XSDT if it is present */ |
153 | ||
154 | if ((acpi_gbl_RSDP->revision >= 2) && | |
4be44fcd | 155 | acpi_gbl_RSDP->xsdt_physical_address) { |
44f6c012 | 156 | out_address->pointer.value = |
4be44fcd | 157 | acpi_gbl_RSDP->xsdt_physical_address; |
73459f73 | 158 | acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT; |
4be44fcd | 159 | } else { |
73459f73 RM |
160 | /* No XSDT, use the RSDT */ |
161 | ||
4be44fcd LB |
162 | out_address->pointer.value = |
163 | acpi_gbl_RSDP->rsdt_physical_address; | |
73459f73 | 164 | acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT; |
1da177e4 LT |
165 | } |
166 | } | |
167 | ||
1da177e4 LT |
168 | /******************************************************************************* |
169 | * | |
170 | * FUNCTION: acpi_tb_validate_rsdt | |
171 | * | |
172 | * PARAMETERS: table_ptr - Addressable pointer to the RSDT. | |
173 | * | |
174 | * RETURN: Status | |
175 | * | |
176 | * DESCRIPTION: Validate signature for the RSDT or XSDT | |
177 | * | |
178 | ******************************************************************************/ | |
179 | ||
4be44fcd | 180 | acpi_status acpi_tb_validate_rsdt(struct acpi_table_header *table_ptr) |
1da177e4 | 181 | { |
b229cf92 | 182 | char *signature; |
1da177e4 | 183 | |
4a90c7e8 | 184 | ACPI_FUNCTION_ENTRY(); |
1da177e4 | 185 | |
f6dd9221 BM |
186 | /* Validate minimum length */ |
187 | ||
188 | if (table_ptr->length < sizeof(struct acpi_table_header)) { | |
189 | ACPI_ERROR((AE_INFO, | |
190 | "RSDT/XSDT length (%X) is smaller than minimum (%X)", | |
191 | table_ptr->length, | |
192 | sizeof(struct acpi_table_header))); | |
193 | ||
194 | return (AE_INVALID_TABLE_LENGTH); | |
195 | } | |
196 | ||
b229cf92 BM |
197 | /* Search for appropriate signature, RSDT or XSDT */ |
198 | ||
73459f73 | 199 | if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
b229cf92 | 200 | signature = RSDT_SIG; |
4be44fcd | 201 | } else { |
b229cf92 | 202 | signature = XSDT_SIG; |
1da177e4 LT |
203 | } |
204 | ||
b229cf92 | 205 | if (!ACPI_COMPARE_NAME(table_ptr->signature, signature)) { |
52fc0b02 | 206 | |
1da177e4 LT |
207 | /* Invalid RSDT or XSDT signature */ |
208 | ||
b8e4d893 BM |
209 | ACPI_ERROR((AE_INFO, |
210 | "Invalid signature where RSDP indicates RSDT/XSDT should be located. RSDP:")); | |
1da177e4 | 211 | |
4be44fcd | 212 | ACPI_DUMP_BUFFER(acpi_gbl_RSDP, 20); |
1da177e4 | 213 | |
b8e4d893 | 214 | ACPI_ERROR((AE_INFO, |
958dd242 BM |
215 | "RSDT/XSDT signature at %X is invalid", |
216 | acpi_gbl_RSDP->rsdt_physical_address)); | |
1da177e4 | 217 | |
73459f73 | 218 | if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
b8e4d893 | 219 | ACPI_ERROR((AE_INFO, "Looking for RSDT")); |
4be44fcd | 220 | } else { |
b8e4d893 | 221 | ACPI_ERROR((AE_INFO, "Looking for XSDT")); |
1da177e4 LT |
222 | } |
223 | ||
f6dd9221 | 224 | ACPI_DUMP_BUFFER(ACPI_CAST_PTR(char, table_ptr), 48); |
1da177e4 LT |
225 | return (AE_BAD_SIGNATURE); |
226 | } | |
227 | ||
228 | return (AE_OK); | |
229 | } | |
230 | ||
1da177e4 LT |
231 | /******************************************************************************* |
232 | * | |
233 | * FUNCTION: acpi_tb_get_table_rsdt | |
234 | * | |
235 | * PARAMETERS: None | |
236 | * | |
237 | * RETURN: Status | |
238 | * | |
239 | * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table) | |
240 | * | |
241 | ******************************************************************************/ | |
242 | ||
4be44fcd | 243 | acpi_status acpi_tb_get_table_rsdt(void) |
1da177e4 | 244 | { |
4be44fcd LB |
245 | struct acpi_table_desc table_info; |
246 | acpi_status status; | |
247 | struct acpi_pointer address; | |
1da177e4 | 248 | |
b229cf92 | 249 | ACPI_FUNCTION_TRACE(tb_get_table_rsdt); |
1da177e4 LT |
250 | |
251 | /* Get the RSDT/XSDT via the RSDP */ | |
252 | ||
4be44fcd | 253 | acpi_tb_get_rsdt_address(&address); |
1da177e4 | 254 | |
b229cf92 | 255 | table_info.type = ACPI_TABLE_ID_XSDT; |
4be44fcd LB |
256 | status = acpi_tb_get_table(&address, &table_info); |
257 | if (ACPI_FAILURE(status)) { | |
b8e4d893 BM |
258 | ACPI_EXCEPTION((AE_INFO, status, |
259 | "Could not get the RSDT/XSDT")); | |
4be44fcd | 260 | return_ACPI_STATUS(status); |
1da177e4 LT |
261 | } |
262 | ||
4be44fcd | 263 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
50eca3eb | 264 | "RSDP located at %p, points to RSDT physical=%8.8X%8.8X\n", |
4be44fcd LB |
265 | acpi_gbl_RSDP, |
266 | ACPI_FORMAT_UINT64(address.pointer.value))); | |
1da177e4 LT |
267 | |
268 | /* Check the RSDT or XSDT signature */ | |
269 | ||
4be44fcd LB |
270 | status = acpi_tb_validate_rsdt(table_info.pointer); |
271 | if (ACPI_FAILURE(status)) { | |
f6dd9221 | 272 | goto error_cleanup; |
1da177e4 LT |
273 | } |
274 | ||
275 | /* Get the number of tables defined in the RSDT or XSDT */ | |
276 | ||
4be44fcd LB |
277 | acpi_gbl_rsdt_table_count = acpi_tb_get_table_count(acpi_gbl_RSDP, |
278 | table_info.pointer); | |
1da177e4 LT |
279 | |
280 | /* Convert and/or copy to an XSDT structure */ | |
281 | ||
4be44fcd LB |
282 | status = acpi_tb_convert_to_xsdt(&table_info); |
283 | if (ACPI_FAILURE(status)) { | |
f6dd9221 | 284 | goto error_cleanup; |
1da177e4 LT |
285 | } |
286 | ||
287 | /* Save the table pointers and allocation info */ | |
288 | ||
b229cf92 | 289 | status = acpi_tb_init_table_descriptor(ACPI_TABLE_ID_XSDT, &table_info); |
4be44fcd | 290 | if (ACPI_FAILURE(status)) { |
f6dd9221 | 291 | goto error_cleanup; |
1da177e4 LT |
292 | } |
293 | ||
793c2388 BM |
294 | acpi_gbl_XSDT = |
295 | ACPI_CAST_PTR(struct xsdt_descriptor, table_info.pointer); | |
1da177e4 | 296 | |
4be44fcd LB |
297 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT)); |
298 | return_ACPI_STATUS(status); | |
f6dd9221 BM |
299 | |
300 | error_cleanup: | |
301 | ||
302 | /* Free table allocated by acpi_tb_get_table */ | |
303 | ||
304 | acpi_tb_delete_single_table(&table_info); | |
305 | ||
306 | return_ACPI_STATUS(status); | |
1da177e4 | 307 | } |