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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <acpi/acpi.h> |
| 45 | #include <acpi/actables.h> |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #define _COMPONENT ACPI_TABLES |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 48 | ACPI_MODULE_NAME("tbxfroot") |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 50 | /* Local prototypes */ |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 51 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 52 | acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 53 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 54 | 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] | 55 | |
| 56 | /******************************************************************************* |
| 57 | * |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 58 | * FUNCTION: acpi_tb_validate_rsdp |
| 59 | * |
| 60 | * PARAMETERS: Rsdp - Pointer to unvalidated RSDP |
| 61 | * |
| 62 | * RETURN: Status |
| 63 | * |
| 64 | * DESCRIPTION: Validate the RSDP (ptr) |
| 65 | * |
| 66 | ******************************************************************************/ |
| 67 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 68 | acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp) |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 69 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 70 | ACPI_FUNCTION_ENTRY(); |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 71 | |
| 72 | /* |
| 73 | * The signature and checksum must both be correct |
| 74 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 75 | if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 76 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 77 | /* Nope, BAD Signature */ |
| 78 | |
| 79 | return (AE_BAD_SIGNATURE); |
| 80 | } |
| 81 | |
| 82 | /* Check the standard checksum */ |
| 83 | |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame^] | 84 | if (acpi_tb_sum_table(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 85 | return (AE_BAD_CHECKSUM); |
| 86 | } |
| 87 | |
| 88 | /* Check extended checksum if table version >= 2 */ |
| 89 | |
| 90 | if ((rsdp->revision >= 2) && |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame^] | 91 | (acpi_tb_sum_table(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0)) { |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 92 | return (AE_BAD_CHECKSUM); |
| 93 | } |
| 94 | |
| 95 | return (AE_OK); |
| 96 | } |
| 97 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 98 | /******************************************************************************* |
| 99 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | * FUNCTION: acpi_tb_find_table |
| 101 | * |
| 102 | * PARAMETERS: Signature - String with ACPI table signature |
| 103 | * oem_id - String with the table OEM ID |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 104 | * oem_table_id - String with the OEM Table ID |
| 105 | * table_ptr - Where the table pointer is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | * |
| 107 | * RETURN: Status |
| 108 | * |
| 109 | * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the |
| 110 | * Signature, OEM ID and OEM Table ID. |
| 111 | * |
| 112 | ******************************************************************************/ |
| 113 | |
| 114 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 115 | acpi_tb_find_table(char *signature, |
| 116 | char *oem_id, |
| 117 | char *oem_table_id, struct acpi_table_header ** table_ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 119 | acpi_status status; |
| 120 | struct acpi_table_header *table; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 122 | ACPI_FUNCTION_TRACE("tb_find_table"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | /* Validate string lengths */ |
| 125 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 126 | if ((ACPI_STRLEN(signature) > ACPI_NAME_SIZE) || |
| 127 | (ACPI_STRLEN(oem_id) > sizeof(table->oem_id)) || |
| 128 | (ACPI_STRLEN(oem_table_id) > sizeof(table->oem_table_id))) { |
| 129 | return_ACPI_STATUS(AE_AML_STRING_LIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 132 | if (!ACPI_STRNCMP(signature, DSDT_SIG, ACPI_NAME_SIZE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * The DSDT pointer is contained in the FADT, not the RSDT. |
| 135 | * This code should suffice, because the only code that would perform |
| 136 | * a "find" on the DSDT is the data_table_region() AML opcode -- in |
| 137 | * which case, the DSDT is guaranteed to be already loaded. |
| 138 | * If this becomes insufficient, the FADT will have to be found first. |
| 139 | */ |
| 140 | if (!acpi_gbl_DSDT) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 141 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | table = acpi_gbl_DSDT; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 144 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* Find the table */ |
| 146 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 147 | status = acpi_get_firmware_table(signature, 1, |
| 148 | ACPI_LOGICAL_ADDRESSING, |
| 149 | &table); |
| 150 | if (ACPI_FAILURE(status)) { |
| 151 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | } |
| 154 | |
| 155 | /* Check oem_id and oem_table_id */ |
| 156 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 157 | if ((oem_id[0] && ACPI_STRNCMP(oem_id, table->oem_id, |
| 158 | sizeof(table->oem_id))) || |
| 159 | (oem_table_id[0] && ACPI_STRNCMP(oem_table_id, table->oem_table_id, |
| 160 | sizeof(table->oem_table_id)))) { |
| 161 | return_ACPI_STATUS(AE_AML_NAME_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 164 | ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Found table [%4.4s]\n", |
| 165 | table->signature)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | *table_ptr = table; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 168 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /******************************************************************************* |
| 172 | * |
| 173 | * FUNCTION: acpi_get_firmware_table |
| 174 | * |
| 175 | * PARAMETERS: Signature - Any ACPI table signature |
| 176 | * Instance - the non zero instance of the table, allows |
| 177 | * support for multiple tables of the same type |
| 178 | * Flags - Physical/Virtual support |
| 179 | * table_pointer - Where a buffer containing the table is |
| 180 | * returned |
| 181 | * |
| 182 | * RETURN: Status |
| 183 | * |
| 184 | * DESCRIPTION: This function is called to get an ACPI table. A buffer is |
| 185 | * allocated for the table and returned in table_pointer. |
| 186 | * This table will be a complete table including the header. |
| 187 | * |
| 188 | ******************************************************************************/ |
| 189 | |
| 190 | acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 191 | acpi_get_firmware_table(acpi_string signature, |
| 192 | u32 instance, |
| 193 | u32 flags, struct acpi_table_header **table_pointer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 195 | acpi_status status; |
| 196 | struct acpi_pointer address; |
| 197 | struct acpi_table_header *header = NULL; |
| 198 | struct acpi_table_desc *table_info = NULL; |
| 199 | struct acpi_table_desc *rsdt_info; |
| 200 | u32 table_count; |
| 201 | u32 i; |
| 202 | u32 j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 204 | ACPI_FUNCTION_TRACE("acpi_get_firmware_table"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | /* |
| 207 | * Ensure that at least the table manager is initialized. We don't |
| 208 | * require that the entire ACPI subsystem is up for this interface. |
| 209 | * If we have a buffer, we must have a length too |
| 210 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 211 | if ((instance == 0) || (!signature) || (!table_pointer)) { |
| 212 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | /* Ensure that we have a RSDP */ |
| 216 | |
| 217 | if (!acpi_gbl_RSDP) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | /* Get the RSDP */ |
| 220 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 221 | status = acpi_os_get_root_pointer(flags, &address); |
| 222 | if (ACPI_FAILURE(status)) { |
| 223 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "RSDP not found\n")); |
| 224 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | /* Map and validate the RSDP */ |
| 228 | |
| 229 | if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 230 | status = acpi_os_map_memory(address.pointer.physical, |
| 231 | sizeof(struct |
| 232 | rsdp_descriptor), |
| 233 | (void *)&acpi_gbl_RSDP); |
| 234 | if (ACPI_FAILURE(status)) { |
| 235 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 237 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | acpi_gbl_RSDP = address.pointer.logical; |
| 239 | } |
| 240 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 241 | /* The RDSP signature and checksum must both be correct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 243 | status = acpi_tb_validate_rsdp(acpi_gbl_RSDP); |
| 244 | if (ACPI_FAILURE(status)) { |
| 245 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | |
| 249 | /* Get the RSDT address via the RSDP */ |
| 250 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 251 | acpi_tb_get_rsdt_address(&address); |
| 252 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 253 | "RSDP located at %p, RSDT physical=%8.8X%8.8X\n", |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 254 | acpi_gbl_RSDP, |
| 255 | ACPI_FORMAT_UINT64(address.pointer.value))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
| 257 | /* Insert processor_mode flags */ |
| 258 | |
| 259 | address.pointer_type |= flags; |
| 260 | |
| 261 | /* Get and validate the RSDT */ |
| 262 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 263 | rsdt_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_table_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (!rsdt_info) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 265 | return_ACPI_STATUS(AE_NO_MEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 268 | status = acpi_tb_get_table(&address, rsdt_info); |
| 269 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | goto cleanup; |
| 271 | } |
| 272 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 273 | status = acpi_tb_validate_rsdt(rsdt_info->pointer); |
| 274 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | goto cleanup; |
| 276 | } |
| 277 | |
| 278 | /* Allocate a scratch table header and table descriptor */ |
| 279 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 280 | header = ACPI_ALLOCATE(sizeof(struct acpi_table_header)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (!header) { |
| 282 | status = AE_NO_MEMORY; |
| 283 | goto cleanup; |
| 284 | } |
| 285 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 286 | table_info = ACPI_ALLOCATE(sizeof(struct acpi_table_desc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | if (!table_info) { |
| 288 | status = AE_NO_MEMORY; |
| 289 | goto cleanup; |
| 290 | } |
| 291 | |
| 292 | /* Get the number of table pointers within the RSDT */ |
| 293 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 294 | table_count = |
| 295 | acpi_tb_get_table_count(acpi_gbl_RSDP, rsdt_info->pointer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | address.pointer_type = acpi_gbl_table_flags | flags; |
| 297 | |
| 298 | /* |
| 299 | * Search the RSDT/XSDT for the correct instance of the |
| 300 | * requested table |
| 301 | */ |
| 302 | for (i = 0, j = 0; i < table_count; i++) { |
Robert Moore | 73459f7 | 2005-06-24 00:00:00 -0400 | [diff] [blame] | 303 | /* |
| 304 | * Get the next table pointer, handle RSDT vs. XSDT |
| 305 | * RSDT pointers are 32 bits, XSDT pointers are 64 bits |
| 306 | */ |
| 307 | if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 308 | address.pointer.value = |
| 309 | (ACPI_CAST_PTR |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame^] | 310 | (struct rsdt_descriptor, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 311 | rsdt_info->pointer))->table_offset_entry[i]; |
| 312 | } else { |
| 313 | address.pointer.value = |
| 314 | (ACPI_CAST_PTR |
Bob Moore | 793c238 | 2006-03-31 00:00:00 -0500 | [diff] [blame^] | 315 | (struct xsdt_descriptor, |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 316 | rsdt_info->pointer))->table_offset_entry[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | /* Get the table header */ |
| 320 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 321 | status = acpi_tb_get_table_header(&address, header); |
| 322 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | goto cleanup; |
| 324 | } |
| 325 | |
| 326 | /* Compare table signatures and table instance */ |
| 327 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 328 | if (!ACPI_STRNCMP(header->signature, signature, ACPI_NAME_SIZE)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 329 | |
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) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | /* Found the correct instance, get the entire table */ |
| 336 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 337 | status = |
| 338 | acpi_tb_get_table_body(&address, header, |
| 339 | table_info); |
| 340 | if (ACPI_FAILURE(status)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | goto cleanup; |
| 342 | } |
| 343 | |
| 344 | *table_pointer = table_info->pointer; |
| 345 | goto cleanup; |
| 346 | } |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | /* Did not find the table */ |
| 351 | |
| 352 | status = AE_NOT_EXIST; |
| 353 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 354 | cleanup: |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 355 | if (rsdt_info->pointer) { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 356 | acpi_os_unmap_memory(rsdt_info->pointer, |
| 357 | (acpi_size) rsdt_info->pointer->length); |
Robert Moore | 88ac00f | 2005-05-26 00:00:00 -0400 | [diff] [blame] | 358 | } |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 359 | ACPI_FREE(rsdt_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | if (header) { |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 362 | ACPI_FREE(header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | } |
| 364 | if (table_info) { |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 365 | ACPI_FREE(table_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 367 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 370 | ACPI_EXPORT_SYMBOL(acpi_get_firmware_table) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
| 372 | /* TBD: Move to a new file */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | #if ACPI_MACHINE_WIDTH != 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | /******************************************************************************* |
| 375 | * |
| 376 | * FUNCTION: acpi_find_root_pointer |
| 377 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 378 | * PARAMETERS: Flags - Logical/Physical addressing |
| 379 | * rsdp_address - Where to place the RSDP address |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | * |
| 381 | * RETURN: Status, Physical address of the RSDP |
| 382 | * |
| 383 | * DESCRIPTION: Find the RSDP |
| 384 | * |
| 385 | ******************************************************************************/ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 386 | 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] | 387 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 388 | struct acpi_table_desc table_info; |
| 389 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 391 | ACPI_FUNCTION_TRACE("acpi_find_root_pointer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | /* Get the RSDP */ |
| 394 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 395 | status = acpi_tb_find_rsdp(&table_info, flags); |
| 396 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 397 | ACPI_EXCEPTION((AE_INFO, status, |
| 398 | "RSDP structure not found - Flags=%X", flags)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 399 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 400 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | rsdp_address->pointer_type = ACPI_PHYSICAL_POINTER; |
| 404 | rsdp_address->pointer.physical = table_info.physical_address; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 405 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | } |
| 407 | |
Bob Moore | 8313524 | 2006-10-03 00:00:00 -0400 | [diff] [blame] | 408 | ACPI_EXPORT_SYMBOL(acpi_find_root_pointer) |
| 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 | ******************************************************************************/ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 422 | 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] | 423 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 424 | acpi_status status; |
| 425 | u8 *mem_rover; |
| 426 | u8 *end_address; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 428 | ACPI_FUNCTION_TRACE("tb_scan_memory_for_rsdp"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | end_address = start_address + length; |
| 431 | |
| 432 | /* Search from given start address for the requested length */ |
| 433 | |
| 434 | for (mem_rover = start_address; mem_rover < end_address; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 435 | mem_rover += ACPI_RSDP_SCAN_STEP) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 436 | |
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)) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 443 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 444 | /* Sig and checksum valid, we have found a real RSDP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 446 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 447 | "RSDP located at physical address %p\n", |
| 448 | mem_rover)); |
| 449 | return_PTR(mem_rover); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | } |
| 451 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 452 | /* No sig match or bad checksum, keep searching */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /* Searched entire block, no RSDP was found */ |
| 456 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 457 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 458 | "Searched entire block from %p, valid RSDP was not found\n", |
| 459 | start_address)); |
| 460 | return_PTR(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | /******************************************************************************* |
| 464 | * |
| 465 | * FUNCTION: acpi_tb_find_rsdp |
| 466 | * |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 467 | * PARAMETERS: table_info - Where the table info is returned |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | * Flags - Current memory mode (logical vs. |
| 469 | * physical addressing) |
| 470 | * |
| 471 | * RETURN: Status, RSDP physical address |
| 472 | * |
| 473 | * DESCRIPTION: search lower 1_mbyte of memory for the root system descriptor |
| 474 | * pointer structure. If it is found, set *RSDP to point to it. |
| 475 | * |
| 476 | * NOTE1: The RSDp must be either in the first 1_k of the Extended |
| 477 | * BIOS Data Area or between E0000 and FFFFF (From ACPI Spec.) |
| 478 | * Only a 32-bit physical address is necessary. |
| 479 | * |
| 480 | * NOTE2: This function is always available, regardless of the |
| 481 | * initialization state of the rest of ACPI. |
| 482 | * |
| 483 | ******************************************************************************/ |
| 484 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 485 | static acpi_status |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 486 | acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 488 | u8 *table_ptr; |
| 489 | u8 *mem_rover; |
| 490 | u32 physical_address; |
| 491 | acpi_status status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 493 | ACPI_FUNCTION_TRACE("tb_find_rsdp"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 496 | * Scan supports either logical addressing or physical addressing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | */ |
| 498 | if ((flags & ACPI_MEMORY_MODE) == ACPI_LOGICAL_ADDRESSING) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 499 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 500 | /* 1a) Get the location of the Extended BIOS Data Area (EBDA) */ |
| 501 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 502 | status = acpi_os_map_memory((acpi_physical_address) |
| 503 | ACPI_EBDA_PTR_LOCATION, |
| 504 | ACPI_EBDA_PTR_LENGTH, |
| 505 | (void *)&table_ptr); |
| 506 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 507 | ACPI_ERROR((AE_INFO, |
| 508 | "Could not map memory at %8.8X for length %X", |
| 509 | ACPI_EBDA_PTR_LOCATION, |
| 510 | ACPI_EBDA_PTR_LENGTH)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 511 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 512 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
| 514 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 515 | ACPI_MOVE_16_TO_32(&physical_address, table_ptr); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 516 | |
| 517 | /* Convert segment part to physical address */ |
| 518 | |
| 519 | physical_address <<= 4; |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 520 | acpi_os_unmap_memory(table_ptr, ACPI_EBDA_PTR_LENGTH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | |
| 522 | /* EBDA present? */ |
| 523 | |
| 524 | if (physical_address > 0x400) { |
| 525 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 526 | * 1b) Search EBDA paragraphs (EBDa is required to be a |
| 527 | * minimum of 1_k length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 529 | status = acpi_os_map_memory((acpi_physical_address) |
| 530 | physical_address, |
| 531 | ACPI_EBDA_WINDOW_SIZE, |
| 532 | (void *)&table_ptr); |
| 533 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 534 | ACPI_ERROR((AE_INFO, |
| 535 | "Could not map memory at %8.8X for length %X", |
| 536 | physical_address, |
| 537 | ACPI_EBDA_WINDOW_SIZE)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 538 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 539 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 542 | mem_rover = acpi_tb_scan_memory_for_rsdp(table_ptr, |
| 543 | ACPI_EBDA_WINDOW_SIZE); |
| 544 | acpi_os_unmap_memory(table_ptr, ACPI_EBDA_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | if (mem_rover) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 547 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 548 | /* Return the physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 550 | physical_address += |
| 551 | ACPI_PTR_DIFF(mem_rover, table_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 553 | table_info->physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 554 | (acpi_physical_address) physical_address; |
| 555 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh |
| 561 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 562 | status = acpi_os_map_memory((acpi_physical_address) |
| 563 | ACPI_HI_RSDP_WINDOW_BASE, |
| 564 | ACPI_HI_RSDP_WINDOW_SIZE, |
| 565 | (void *)&table_ptr); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 566 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 567 | if (ACPI_FAILURE(status)) { |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 568 | ACPI_ERROR((AE_INFO, |
| 569 | "Could not map memory at %8.8X for length %X", |
| 570 | ACPI_HI_RSDP_WINDOW_BASE, |
| 571 | ACPI_HI_RSDP_WINDOW_SIZE)); |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 572 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 573 | return_ACPI_STATUS(status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 576 | mem_rover = |
| 577 | acpi_tb_scan_memory_for_rsdp(table_ptr, |
| 578 | ACPI_HI_RSDP_WINDOW_SIZE); |
| 579 | acpi_os_unmap_memory(table_ptr, ACPI_HI_RSDP_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | |
| 581 | if (mem_rover) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 582 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 583 | /* Return the physical address */ |
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 | physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 586 | ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF(mem_rover, |
| 587 | table_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 589 | table_info->physical_address = |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 590 | (acpi_physical_address) physical_address; |
| 591 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Physical addressing |
| 597 | */ |
| 598 | else { |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 599 | /* 1a) Get the location of the EBDA */ |
| 600 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 601 | ACPI_MOVE_16_TO_32(&physical_address, ACPI_EBDA_PTR_LOCATION); |
| 602 | physical_address <<= 4; /* Convert segment to physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | |
| 604 | /* EBDA present? */ |
| 605 | |
| 606 | if (physical_address > 0x400) { |
| 607 | /* |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 608 | * 1b) Search EBDA paragraphs (EBDa is required to be a minimum of |
| 609 | * 1_k length) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | */ |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 611 | mem_rover = |
| 612 | acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR |
| 613 | (physical_address), |
| 614 | ACPI_EBDA_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | if (mem_rover) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 616 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 617 | /* Return the physical address */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 619 | table_info->physical_address = |
| 620 | ACPI_TO_INTEGER(mem_rover); |
| 621 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | } |
| 623 | } |
| 624 | |
Robert Moore | 44f6c01 | 2005-04-18 22:49:35 -0400 | [diff] [blame] | 625 | /* 2) Search upper memory: 16-byte boundaries in E0000h-FFFFFh */ |
| 626 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 627 | mem_rover = |
| 628 | acpi_tb_scan_memory_for_rsdp(ACPI_PHYSADDR_TO_PTR |
| 629 | (ACPI_HI_RSDP_WINDOW_BASE), |
| 630 | ACPI_HI_RSDP_WINDOW_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | if (mem_rover) { |
Bob Moore | 52fc0b0 | 2006-10-02 00:00:00 -0400 | [diff] [blame] | 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* Found it, return the physical address */ |
| 634 | |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 635 | table_info->physical_address = |
| 636 | ACPI_TO_INTEGER(mem_rover); |
| 637 | return_ACPI_STATUS(AE_OK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | } |
| 640 | |
Robert Moore | f9f4601 | 2005-07-08 00:00:00 -0400 | [diff] [blame] | 641 | /* A valid RSDP was not found */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
Bob Moore | b8e4d89 | 2006-01-27 16:43:00 -0500 | [diff] [blame] | 643 | ACPI_ERROR((AE_INFO, "No valid RSDP was found")); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 644 | return_ACPI_STATUS(AE_NOT_FOUND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | #endif |