Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: tbxfroot - Find the root ACPI table (RSDT) |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 4a90c7e | 2006-01-13 16:22:00 -0500 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2006, R. Byron Moore |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 44 | #include <linux/module.h> |
| 45 | |
| 46 | #include <acpi/acpi.h> |
| 47 | #include <acpi/actables.h> |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #define _COMPONENT ACPI_TABLES |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 50 | ACPI_MODULE_NAME("tbxfroot") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 52 | /* Local prototypes */ |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 53 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 54 | acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 55 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 56 | static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /******************************************************************************* |
| 59 | * |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 60 | * FUNCTION: acpi_tb_validate_rsdp |
| 61 | * |
| 62 | * PARAMETERS: Rsdp - Pointer to unvalidated RSDP |
| 63 | * |
| 64 | * RETURN: Status |
| 65 | * |
| 66 | * DESCRIPTION: Validate the RSDP (ptr) |
| 67 | * |
| 68 | ******************************************************************************/ |
| 69 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp) |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 71 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 72 | ACPI_FUNCTION_ENTRY(); |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 73 | |
| 74 | /* |
| 75 | * The signature and checksum must both be correct |
| 76 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 77 | if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 78 | /* Nope, BAD Signature */ |
| 79 | |
| 80 | return (AE_BAD_SIGNATURE); |
| 81 | } |
| 82 | |
| 83 | /* Check the standard checksum */ |
| 84 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 85 | if (acpi_tb_generate_checksum(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 86 | return (AE_BAD_CHECKSUM); |
| 87 | } |
| 88 | |
| 89 | /* Check extended checksum if table version >= 2 */ |
| 90 | |
| 91 | if ((rsdp->revision >= 2) && |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 92 | (acpi_tb_generate_checksum(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != |
| 93 | 0)) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 94 | return (AE_BAD_CHECKSUM); |
| 95 | } |
| 96 | |
| 97 | return (AE_OK); |
| 98 | } |
| 99 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 100 | /******************************************************************************* |
| 101 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | * FUNCTION: acpi_tb_find_table |
| 103 | * |
| 104 | * PARAMETERS: Signature - String with ACPI table signature |
| 105 | * oem_id - String with the table OEM ID |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 106 | * oem_table_id - String with the OEM Table ID |
| 107 | * table_ptr - Where the table pointer is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | * |
| 109 | * RETURN: Status |
| 110 | * |
| 111 | * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the |
| 112 | * Signature, OEM ID and OEM Table ID. |
| 113 | * |
| 114 | ******************************************************************************/ |
| 115 | |
| 116 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 117 | acpi_tb_find_table(char *signature, |
| 118 | char *oem_id, |
| 119 | char *oem_table_id, struct acpi_table_header ** table_ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 121 | acpi_status status; |
| 122 | struct acpi_table_header *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 124 | ACPI_FUNCTION_TRACE("tb_find_table"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | /* Validate string lengths */ |
| 127 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 128 | if ((ACPI_STRLEN(signature) > ACPI_NAME_SIZE) || |
| 129 | (ACPI_STRLEN(oem_id) > sizeof(table->oem_id)) || |
| 130 | (ACPI_STRLEN(oem_table_id) > sizeof(table->oem_table_id))) { |
| 131 | return_ACPI_STATUS(AE_AML_STRING_LIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 134 | if (!ACPI_STRNCMP(signature, DSDT_SIG, ACPI_NAME_SIZE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | /* |
| 136 | * The DSDT pointer is contained in the FADT, not the RSDT. |
| 137 | * This code should suffice, because the only code that would perform |
| 138 | * a "find" on the DSDT is the data_table_region() AML opcode -- in |
| 139 | * which case, the DSDT is guaranteed to be already loaded. |
| 140 | * If this becomes insufficient, the FADT will have to be found first. |
| 141 | */ |
| 142 | if (!acpi_gbl_DSDT) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 143 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | table = acpi_gbl_DSDT; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 146 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | /* Find the table */ |
| 148 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 149 | status = acpi_get_firmware_table(signature, 1, |
| 150 | ACPI_LOGICAL_ADDRESSING, |
| 151 | &table); |
| 152 | if (ACPI_FAILURE(status)) { |
| 153 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | } |
| 156 | |
| 157 | /* Check oem_id and oem_table_id */ |
| 158 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 159 | if ((oem_id[0] && ACPI_STRNCMP(oem_id, table->oem_id, |
| 160 | sizeof(table->oem_id))) || |
| 161 | (oem_table_id[0] && ACPI_STRNCMP(oem_table_id, table->oem_table_id, |
| 162 | sizeof(table->oem_table_id)))) { |
| 163 | return_ACPI_STATUS(AE_AML_NAME_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 166 | ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Found table [%4.4s]\n", |
| 167 | table->signature)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | *table_ptr = table; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 170 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /******************************************************************************* |
| 174 | * |
| 175 | * FUNCTION: acpi_get_firmware_table |
| 176 | * |
| 177 | * PARAMETERS: Signature - Any ACPI table signature |
| 178 | * Instance - the non zero instance of the table, allows |
| 179 | * support for multiple tables of the same type |
| 180 | * Flags - Physical/Virtual support |
| 181 | * table_pointer - Where a buffer containing the table is |
| 182 | * returned |
| 183 | * |
| 184 | * RETURN: Status |
| 185 | * |
| 186 | * DESCRIPTION: This function is called to get an ACPI table. A buffer is |
| 187 | * allocated for the table and returned in table_pointer. |
| 188 | * This table will be a complete table including the header. |
| 189 | * |
| 190 | ******************************************************************************/ |
| 191 | |
| 192 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 193 | acpi_get_firmware_table(acpi_string signature, |
| 194 | u32 instance, |
| 195 | u32 flags, struct acpi_table_header **table_pointer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 197 | acpi_status status; |
| 198 | struct acpi_pointer address; |
| 199 | struct acpi_table_header *header = NULL; |
| 200 | struct acpi_table_desc *table_info = NULL; |
| 201 | struct acpi_table_desc *rsdt_info; |
| 202 | u32 table_count; |
| 203 | u32 i; |
| 204 | u32 j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 206 | ACPI_FUNCTION_TRACE("acpi_get_firmware_table"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | /* |
| 209 | * Ensure that at least the table manager is initialized. We don't |
| 210 | * require that the entire ACPI subsystem is up for this interface. |
| 211 | * If we have a buffer, we must have a length too |
| 212 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 213 | if ((instance == 0) || (!signature) || (!table_pointer)) { |
| 214 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /* Ensure that we have a RSDP */ |
| 218 | |
| 219 | if (!acpi_gbl_RSDP) { |
| 220 | /* Get the RSDP */ |
| 221 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 222 | status = acpi_os_get_root_pointer(flags, &address); |
| 223 | if (ACPI_FAILURE(status)) { |
| 224 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "RSDP not found\n")); |
| 225 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* Map and validate the RSDP */ |
| 229 | |
| 230 | if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 231 | status = acpi_os_map_memory(address.pointer.physical, |
| 232 | sizeof(struct |
| 233 | rsdp_descriptor), |
| 234 | (void *)&acpi_gbl_RSDP); |
| 235 | if (ACPI_FAILURE(status)) { |
| 236 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 238 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | acpi_gbl_RSDP = address.pointer.logical; |
| 240 | } |
| 241 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 242 | /* The RDSP signature and checksum must both be correct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 244 | status = acpi_tb_validate_rsdp(acpi_gbl_RSDP); |
| 245 | if (ACPI_FAILURE(status)) { |
| 246 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | } |
| 249 | |
| 250 | /* Get the RSDT address via the RSDP */ |
| 251 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 252 | acpi_tb_get_rsdt_address(&address); |
| 253 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 254 | "RSDP located at %p, RSDT physical=%8.8X%8.8X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 255 | acpi_gbl_RSDP, |
| 256 | ACPI_FORMAT_UINT64(address.pointer.value))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
| 258 | /* Insert processor_mode flags */ |
| 259 | |
| 260 | address.pointer_type |= flags; |
| 261 | |
| 262 | /* Get and validate the RSDT */ |
| 263 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 264 | rsdt_info = ACPI_MEM_CALLOCATE(sizeof(struct acpi_table_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | if (!rsdt_info) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 266 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 269 | status = acpi_tb_get_table(&address, rsdt_info); |
| 270 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | goto cleanup; |
| 272 | } |
| 273 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 274 | status = acpi_tb_validate_rsdt(rsdt_info->pointer); |
| 275 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | goto cleanup; |
| 277 | } |
| 278 | |
| 279 | /* Allocate a scratch table header and table descriptor */ |
| 280 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 281 | header = ACPI_MEM_ALLOCATE(sizeof(struct acpi_table_header)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (!header) { |
| 283 | status = AE_NO_MEMORY; |
| 284 | goto cleanup; |
| 285 | } |
| 286 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 287 | table_info = ACPI_MEM_ALLOCATE(sizeof(struct acpi_table_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (!table_info) { |
| 289 | status = AE_NO_MEMORY; |
| 290 | goto cleanup; |
| 291 | } |
| 292 | |
| 293 | /* Get the number of table pointers within the RSDT */ |
| 294 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 295 | table_count = |
| 296 | acpi_tb_get_table_count(acpi_gbl_RSDP, rsdt_info->pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | address.pointer_type = acpi_gbl_table_flags | flags; |
| 298 | |
| 299 | /* |
| 300 | * Search the RSDT/XSDT for the correct instance of the |
| 301 | * requested table |
| 302 | */ |
| 303 | for (i = 0, j = 0; i < table_count; i++) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 304 | /* |
| 305 | * Get the next table pointer, handle RSDT vs. XSDT |
| 306 | * RSDT pointers are 32 bits, XSDT pointers are 64 bits |
| 307 | */ |
| 308 | if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 309 | address.pointer.value = |
| 310 | (ACPI_CAST_PTR |
| 311 | (RSDT_DESCRIPTOR, |
| 312 | rsdt_info->pointer))->table_offset_entry[i]; |
| 313 | } else { |
| 314 | address.pointer.value = |
| 315 | (ACPI_CAST_PTR |
| 316 | (XSDT_DESCRIPTOR, |
| 317 | rsdt_info->pointer))->table_offset_entry[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | /* Get the table header */ |
| 321 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 322 | status = acpi_tb_get_table_header(&address, header); |
| 323 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | goto cleanup; |
| 325 | } |
| 326 | |
| 327 | /* Compare table signatures and table instance */ |
| 328 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 329 | if (!ACPI_STRNCMP(header->signature, signature, ACPI_NAME_SIZE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* An instance of the table was found */ |
| 331 | |
| 332 | j++; |
| 333 | if (j >= instance) { |
| 334 | /* Found the correct instance, get the entire table */ |
| 335 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 336 | status = |
| 337 | acpi_tb_get_table_body(&address, header, |
| 338 | table_info); |
| 339 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | goto cleanup; |
| 341 | } |
| 342 | |
| 343 | *table_pointer = table_info->pointer; |
| 344 | goto cleanup; |
| 345 | } |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | /* Did not find the table */ |
| 350 | |
| 351 | status = AE_NOT_EXIST; |
| 352 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 353 | cleanup: |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 354 | if (rsdt_info->pointer) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 355 | acpi_os_unmap_memory(rsdt_info->pointer, |
| 356 | (acpi_size) rsdt_info->pointer->length); |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 357 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 358 | ACPI_MEM_FREE(rsdt_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
| 360 | if (header) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 361 | ACPI_MEM_FREE(header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | if (table_info) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 364 | ACPI_MEM_FREE(table_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 366 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 369 | EXPORT_SYMBOL(acpi_get_firmware_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | /* TBD: Move to a new file */ |
| 372 | |
| 373 | #if ACPI_MACHINE_WIDTH != 16 |
| 374 | |
| 375 | /******************************************************************************* |
| 376 | * |
| 377 | * FUNCTION: acpi_find_root_pointer |
| 378 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 379 | * PARAMETERS: Flags - Logical/Physical addressing |
| 380 | * rsdp_address - Where to place the RSDP address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | * |
| 382 | * RETURN: Status, Physical address of the RSDP |
| 383 | * |
| 384 | * DESCRIPTION: Find the RSDP |
| 385 | * |
| 386 | ******************************************************************************/ |
| 387 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 388 | acpi_status acpi_find_root_pointer(u32 flags, struct acpi_pointer *rsdp_address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 390 | struct acpi_table_desc table_info; |
| 391 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 393 | ACPI_FUNCTION_TRACE("acpi_find_root_pointer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | /* Get the RSDP */ |
| 396 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 397 | status = acpi_tb_find_rsdp(&table_info, flags); |
| 398 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 399 | ACPI_EXCEPTION((AE_INFO, status, |
| 400 | "RSDP structure not found - Flags=%X", flags)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 401 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 402 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER; |
| 406 | rsdp_address->pointer.physical = table_info.physical_address; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 407 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | /******************************************************************************* |
| 411 | * |
| 412 | * FUNCTION: acpi_tb_scan_memory_for_rsdp |
| 413 | * |
| 414 | * PARAMETERS: start_address - Starting pointer for search |
| 415 | * Length - Maximum length to search |
| 416 | * |
| 417 | * RETURN: Pointer to the RSDP if found, otherwise NULL. |
| 418 | * |
| 419 | * DESCRIPTION: Search a block of memory for the RSDP signature |
| 420 | * |
| 421 | ******************************************************************************/ |
| 422 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 423 | static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 425 | acpi_status status; |
| 426 | u8 *mem_rover; |
| 427 | u8 *end_address; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 429 | ACPI_FUNCTION_TRACE("tb_scan_memory_for_rsdp"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | end_address = start_address + length; |
| 432 | |
| 433 | /* Search from given start address for the requested length */ |
| 434 | |
| 435 | for (mem_rover = start_address; mem_rover < end_address; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 436 | mem_rover += ACPI_RSDP_SCAN_STEP) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 437 | /* The RSDP signature and checksum must both be correct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 439 | status = |
| 440 | acpi_tb_validate_rsdp(ACPI_CAST_PTR |
| 441 | (struct rsdp_descriptor, mem_rover)); |
| 442 | if (ACPI_SUCCESS(status)) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 443 | /* Sig and checksum valid, we have found a real RSDP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 445 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 446 | "RSDP located at physical address %p\n", |
| 447 | mem_rover)); |
| 448 | return_PTR(mem_rover); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 451 | /* No sig match or bad checksum, keep searching */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | /* Searched entire block, no RSDP was found */ |
| 455 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 456 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 457 | "Searched entire block from %p, valid RSDP was not found\n", |
| 458 | start_address)); |
| 459 | return_PTR(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /******************************************************************************* |
| 463 | * |
| 464 | * FUNCTION: acpi_tb_find_rsdp |
| 465 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 466 | * PARAMETERS: table_info - Where the table info is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | * Flags - Current memory mode (logical vs. |
| 468 | * physical addressing) |
| 469 | * |
| 470 | * RETURN: Status, RSDP physical address |
| 471 | * |
| 472 | * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor |
| 473 | * pointer structure. If it is found, set *RSDP to point to it. |
| 474 | * |
| 475 | * NOTE1: The RSDp must be either in the first 1_k of the Extended |
| 476 | * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) |
| 477 | * Only a 32-bit physical address is necessary. |
| 478 | * |
| 479 | * NOTE2: This function is always available, regardless of the |
| 480 | * initialization state of the rest of ACPI. |
| 481 | * |
| 482 | ******************************************************************************/ |
| 483 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 484 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 485 | acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 487 | u8 *table_ptr; |
| 488 | u8 *mem_rover; |
| 489 | u32 physical_address; |
| 490 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 492 | ACPI_FUNCTION_TRACE("tb_find_rsdp"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 495 | * Scan supports either logical addressing or physical addressing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | */ |
| 497 | if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 498 | /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ |
| 499 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 500 | status = acpi_os_map_memory((acpi_physical_address) |
| 501 | ACPI_EBDA_PTR_LOCATION, |
| 502 | ACPI_EBDA_PTR_LENGTH, |
| 503 | (void *)&table_ptr); |
| 504 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 505 | ACPI_ERROR((AE_INFO, |
| 506 | "Could not map memory at %8.8X for length %X", |
| 507 | ACPI_EBDA_PTR_LOCATION, |
| 508 | ACPI_EBDA_PTR_LENGTH)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 509 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 510 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 513 | ACPI_MOVE_16_TO_32(&physical_address, table_ptr); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 514 | |
| 515 | /* Convert segment part to physical address */ |
| 516 | |
| 517 | physical_address <<= 4; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 518 | acpi_os_unmap_memory(table_ptr, ACPI_EBDA_PTR_LENGTH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | /* EBDA present? */ |
| 521 | |
| 522 | if (physical_address > 0x400) { |
| 523 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 524 | * 1b) Search EBDA paragraphs (EBDa is required to be a |
| 525 | * minimum of 1_k length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 527 | status = acpi_os_map_memory((acpi_physical_address) |
| 528 | physical_address, |
| 529 | ACPI_EBDA_WINDOW_SIZE, |
| 530 | (void *)&table_ptr); |
| 531 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 532 | ACPI_ERROR((AE_INFO, |
| 533 | "Could not map memory at %8.8X for length %X", |
| 534 | physical_address, |
| 535 | ACPI_EBDA_WINDOW_SIZE)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 536 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 537 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 540 | mem_rover = acpi_tb_scan_memory_for_rsdp(table_ptr, |
| 541 | ACPI_EBDA_WINDOW_SIZE); |
| 542 | acpi_os_unmap_memory(table_ptr, ACPI_EBDA_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 544 | if (mem_rover) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 545 | /* Return the physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 547 | physical_address += |
| 548 | ACPI_PTR_DIFF(mem_rover, table_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 550 | table_info->physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 551 | (acpi_physical_address) physical_address; |
| 552 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | } |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh |
| 558 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 559 | status = acpi_os_map_memory((acpi_physical_address) |
| 560 | ACPI_HI_RSDP_WINDOW_BASE, |
| 561 | ACPI_HI_RSDP_WINDOW_SIZE, |
| 562 | (void *)&table_ptr); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 563 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 564 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 565 | ACPI_ERROR((AE_INFO, |
| 566 | "Could not map memory at %8.8X for length %X", |
| 567 | ACPI_HI_RSDP_WINDOW_BASE, |
| 568 | ACPI_HI_RSDP_WINDOW_SIZE)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 569 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 570 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 573 | mem_rover = |
| 574 | acpi_tb_scan_memory_for_rsdp(table_ptr, |
| 575 | ACPI_HI_RSDP_WINDOW_SIZE); |
| 576 | acpi_os_unmap_memory(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
| 578 | if (mem_rover) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 579 | /* Return the physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 581 | physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 582 | ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF(mem_rover, |
| 583 | table_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 585 | table_info->physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 586 | (acpi_physical_address) physical_address; |
| 587 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * Physical addressing |
| 593 | */ |
| 594 | else { |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 595 | /* 1a) Get the location of the EBDA */ |
| 596 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 597 | ACPI_MOVE_16_TO_32(&physical_address, ACPI_EBDA_PTR_LOCATION); |
| 598 | physical_address <<= 4; /* Convert segment to physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | /* EBDA present? */ |
| 601 | |
| 602 | if (physical_address > 0x400) { |
| 603 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 604 | * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of |
| 605 | * 1_k length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 607 | mem_rover = |
| 608 | acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR |
| 609 | (physical_address), |
| 610 | ACPI_EBDA_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (mem_rover) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 612 | /* Return the physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 614 | table_info->physical_address = |
| 615 | ACPI_TO_INTEGER(mem_rover); |
| 616 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | } |
| 619 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 620 | /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */ |
| 621 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 622 | mem_rover = |
| 623 | acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR |
| 624 | (ACPI_HI_RSDP_WINDOW_BASE), |
| 625 | ACPI_HI_RSDP_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (mem_rover) { |
| 627 | /* Found it, return the physical address */ |
| 628 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 629 | table_info->physical_address = |
| 630 | ACPI_TO_INTEGER(mem_rover); |
| 631 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
| 633 | } |
| 634 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 635 | /* A valid RSDP was not found */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 637 | ACPI_ERROR((AE_INFO, "No valid RSDP was found")); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 638 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | #endif |