drivers/acpi/tables/tbrsdt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbrsdt - ACPI RSDT table utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   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
  45 #include <acpi/acpi.h>
  46 #include <acpi/actables.h>
  47
  48
  49 #define _COMPONENT          ACPI_TABLES
  50          ACPI_MODULE_NAME    ("tbrsdt")
  51
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_tb_verify_rsdp
  56  *
  57  * PARAMETERS:  Address         - RSDP (Pointer to RSDT)
  58  *
  59  * RETURN:      Status
  60  *
  61  * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
  62  *
  63  ******************************************************************************/
  64
  65 acpi_status
  66 acpi_tb_verify_rsdp (
  67         struct acpi_pointer             *address)
  68 {
  69         struct acpi_table_desc          table_info;
  70         acpi_status                     status;
  71         struct rsdp_descriptor          *rsdp;
  72
  73
  74         ACPI_FUNCTION_TRACE ("tb_verify_rsdp");
  75
  76
  77         switch (address->pointer_type) {
  78         case ACPI_LOGICAL_POINTER:
  79
  80                 rsdp = address->pointer.logical;
  81                 break;
  82
  83         case ACPI_PHYSICAL_POINTER:
  84                 /*
  85                  * Obtain access to the RSDP structure
  86                  */
  87                 status = acpi_os_map_memory (address->pointer.physical, sizeof (struct rsdp_descriptor),
  88                                   (void *) &rsdp);
  89                 if (ACPI_FAILURE (status)) {
  90                         return_ACPI_STATUS (status);
  91                 }
  92                 break;
  93
  94         default:
  95                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  96         }
  97
  98         /*
  99          *  The signature and checksum must both be correct
 100          */
 101         if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
 102                 /* Nope, BAD Signature */
 103
 104                 status = AE_BAD_SIGNATURE;
 105                 goto cleanup;
 106         }
 107
 108         /* Check the standard checksum */
 109
 110         if (acpi_tb_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
 111                 status = AE_BAD_CHECKSUM;
 112                 goto cleanup;
 113         }
 114
 115         /* Check extended checksum if table version >= 2 */
 116
 117         if (rsdp->revision >= 2) {
 118                 if (acpi_tb_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) {
 119                         status = AE_BAD_CHECKSUM;
 120                         goto cleanup;
 121                 }
 122         }
 123
 124         /* The RSDP supplied is OK */
 125
 126         table_info.pointer     = ACPI_CAST_PTR (struct acpi_table_header, rsdp);
 127         table_info.length      = sizeof (struct rsdp_descriptor);
 128         table_info.allocation  = ACPI_MEM_MAPPED;
 129
 130         /* Save the table pointers and allocation info */
 131
 132         status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info);
 133         if (ACPI_FAILURE (status)) {
 134                 goto cleanup;
 135         }
 136
 137         /* Save the RSDP in a global for easy access */
 138
 139         acpi_gbl_RSDP = ACPI_CAST_PTR (struct rsdp_descriptor, table_info.pointer);
 140         return_ACPI_STATUS (status);
 141
 142
 143         /* Error exit */
 144 cleanup:
 145
 146         if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
 147                 acpi_os_unmap_memory (rsdp, sizeof (struct rsdp_descriptor));
 148         }
 149         return_ACPI_STATUS (status);
 150 }
 151
 152
 153 /*******************************************************************************
 154  *
 155  * FUNCTION:    acpi_tb_get_rsdt_address
 156  *
 157  * PARAMETERS:  None
 158  *
 159  * RETURN:      RSDT physical address
 160  *
 161  * DESCRIPTION: Extract the address of the RSDT or XSDT, depending on the
 162  *              version of the RSDP
 163  *
 164  ******************************************************************************/
 165
 166 void
 167 acpi_tb_get_rsdt_address (
 168         struct acpi_pointer             *out_address)
 169 {
 170
 171         ACPI_FUNCTION_ENTRY ();
 172
 173
 174         out_address->pointer_type = acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;
 175
 176         /*
 177          * For RSDP revision 0 or 1, we use the RSDT.
 178          * For RSDP revision 2 (and above), we use the XSDT
 179          */
 180         if (acpi_gbl_RSDP->revision < 2) {
 181                 out_address->pointer.value = acpi_gbl_RSDP->rsdt_physical_address;
 182         }
 183         else {
 184                 out_address->pointer.value = acpi_gbl_RSDP->xsdt_physical_address;
 185         }
 186 }
 187
 188
 189 /*******************************************************************************
 190  *
 191  * FUNCTION:    acpi_tb_validate_rsdt
 192  *
 193  * PARAMETERS:  table_ptr       - Addressable pointer to the RSDT.
 194  *
 195  * RETURN:      Status
 196  *
 197  * DESCRIPTION: Validate signature for the RSDT or XSDT
 198  *
 199  ******************************************************************************/
 200
 201 acpi_status
 202 acpi_tb_validate_rsdt (
 203         struct acpi_table_header        *table_ptr)
 204 {
 205         int                             no_match;
 206
 207
 208         ACPI_FUNCTION_NAME ("tb_validate_rsdt");
 209
 210
 211         /*
 212          * For RSDP revision 0 or 1, we use the RSDT.
 213          * For RSDP revision 2 and above, we use the XSDT
 214          */
 215         if (acpi_gbl_RSDP->revision < 2) {
 216                 no_match = ACPI_STRNCMP ((char *) table_ptr, RSDT_SIG,
 217                                   sizeof (RSDT_SIG) -1);
 218         }
 219         else {
 220                 no_match = ACPI_STRNCMP ((char *) table_ptr, XSDT_SIG,
 221                                   sizeof (XSDT_SIG) -1);
 222         }
 223
 224         if (no_match) {
 225                 /* Invalid RSDT or XSDT signature */
 226
 227                 ACPI_REPORT_ERROR (("Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));
 228
 229                 ACPI_DUMP_BUFFER (acpi_gbl_RSDP, 20);
 230
 231                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_ERROR,
 232                         "RSDT/XSDT signature at %X (%p) is invalid\n",
 233                         acpi_gbl_RSDP->rsdt_physical_address,
 234                         (void *) (acpi_native_uint) acpi_gbl_RSDP->rsdt_physical_address));
 235
 236                 if (acpi_gbl_RSDP->revision < 2) {
 237                         ACPI_REPORT_ERROR (("Looking for RSDT (RSDP->Rev < 2)\n"))
 238                 }
 239                 else {
 240                         ACPI_REPORT_ERROR (("Looking for XSDT (RSDP->Rev >= 2)\n"))
 241                 }
 242
 243                 ACPI_DUMP_BUFFER ((char *) table_ptr, 48);
 244
 245                 return (AE_BAD_SIGNATURE);
 246         }
 247
 248         return (AE_OK);
 249 }
 250
 251
 252 /*******************************************************************************
 253  *
 254  * FUNCTION:    acpi_tb_get_table_rsdt
 255  *
 256  * PARAMETERS:  None
 257  *
 258  * RETURN:      Status
 259  *
 260  * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
 261  *
 262  ******************************************************************************/
 263
 264 acpi_status
 265 acpi_tb_get_table_rsdt (
 266         void)
 267 {
 268         struct acpi_table_desc          table_info;
 269         acpi_status                     status;
 270         struct acpi_pointer             address;
 271
 272
 273         ACPI_FUNCTION_TRACE ("tb_get_table_rsdt");
 274
 275
 276         /* Get the RSDT/XSDT via the RSDP */
 277
 278         acpi_tb_get_rsdt_address (&address);
 279
 280         table_info.type = ACPI_TABLE_XSDT;
 281         status = acpi_tb_get_table (&address, &table_info);
 282         if (ACPI_FAILURE (status)) {
 283                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not get the RSDT/XSDT, %s\n",
 284                         acpi_format_exception (status)));
 285                 return_ACPI_STATUS (status);
 286         }
 287
 288         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 289                 "RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
 290                 acpi_gbl_RSDP,
 291                 ACPI_FORMAT_UINT64 (address.pointer.value)));
 292
 293         /* Check the RSDT or XSDT signature */
 294
 295         status = acpi_tb_validate_rsdt (table_info.pointer);
 296         if (ACPI_FAILURE (status)) {
 297                 return_ACPI_STATUS (status);
 298         }
 299
 300         /* Get the number of tables defined in the RSDT or XSDT */
 301
 302         acpi_gbl_rsdt_table_count = acpi_tb_get_table_count (acpi_gbl_RSDP, table_info.pointer);
 303
 304         /* Convert and/or copy to an XSDT structure */
 305
 306         status = acpi_tb_convert_to_xsdt (&table_info);
 307         if (ACPI_FAILURE (status)) {
 308                 return_ACPI_STATUS (status);
 309         }
 310
 311         /* Save the table pointers and allocation info */
 312
 313         status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info);
 314         if (ACPI_FAILURE (status)) {
 315                 return_ACPI_STATUS (status);
 316         }
 317
 318         acpi_gbl_XSDT = ACPI_CAST_PTR (XSDT_DESCRIPTOR, table_info.pointer);
 319
 320         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
 321         return_ACPI_STATUS (status);
 322 }
 323
 324