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,
  88                                  sizeof (struct rsdp_descriptor),
  89                                                    (void *) &rsdp);
  90                 if (ACPI_FAILURE (status)) {
  91                         return_ACPI_STATUS (status);
  92                 }
  93                 break;
  94
  95         default:
  96                 return_ACPI_STATUS (AE_BAD_PARAMETER);
  97         }
  98
  99         /*
 100          *  The signature and checksum must both be correct
 101          */
 102         if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {
 103                 /* Nope, BAD Signature */
 104
 105                 status = AE_BAD_SIGNATURE;
 106                 goto cleanup;
 107         }
 108
 109         /* Check the standard checksum */
 110
 111         if (acpi_tb_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
 112                 status = AE_BAD_CHECKSUM;
 113                 goto cleanup;
 114         }
 115
 116         /* Check extended checksum if table version >= 2 */
 117
 118         if (rsdp->revision >= 2) {
 119                 if (acpi_tb_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) {
 120                         status = AE_BAD_CHECKSUM;
 121                         goto cleanup;
 122                 }
 123         }
 124
 125         /* The RSDP supplied is OK */
 126
 127         table_info.pointer     = ACPI_CAST_PTR (struct acpi_table_header, rsdp);
 128         table_info.length      = sizeof (struct rsdp_descriptor);
 129         table_info.allocation  = ACPI_MEM_MAPPED;
 130
 131         /* Save the table pointers and allocation info */
 132
 133         status = acpi_tb_init_table_descriptor (ACPI_TABLE_RSDP, &table_info);
 134         if (ACPI_FAILURE (status)) {
 135                 goto cleanup;
 136         }
 137
 138         /* Save the RSDP in a global for easy access */
 139
 140         acpi_gbl_RSDP = ACPI_CAST_PTR (struct rsdp_descriptor, table_info.pointer);
 141         return_ACPI_STATUS (status);
 142
 143
 144         /* Error exit */
 145 cleanup:
 146
 147         if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
 148                 acpi_os_unmap_memory (rsdp, sizeof (struct rsdp_descriptor));
 149         }
 150         return_ACPI_STATUS (status);
 151 }
 152
 153
 154 /*******************************************************************************
 155  *
 156  * FUNCTION:    acpi_tb_get_rsdt_address
 157  *
 158  * PARAMETERS:  out_address         - Where the address is returned
 159  *
 160  * RETURN:      None, Address
 161  *
 162  * DESCRIPTION: Extract the address of the RSDT or XSDT, depending on the
 163  *              version of the RSDP
 164  *
 165  ******************************************************************************/
 166
 167 void
 168 acpi_tb_get_rsdt_address (
 169         struct acpi_pointer             *out_address)
 170 {
 171
 172         ACPI_FUNCTION_ENTRY ();
 173
 174
 175         out_address->pointer_type = acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;
 176
 177         /*
 178          * For RSDP revision 0 or 1, we use the RSDT.
 179          * For RSDP revision 2 (and above), we use the XSDT
 180          */
 181         if (acpi_gbl_RSDP->revision < 2) {
 182                 out_address->pointer.value = acpi_gbl_RSDP->rsdt_physical_address;
 183         }
 184         else {
 185                 out_address->pointer.value =
 186                         acpi_gbl_RSDP->xsdt_physical_address;
 187         }
 188 }
 189
 190
 191 /*******************************************************************************
 192  *
 193  * FUNCTION:    acpi_tb_validate_rsdt
 194  *
 195  * PARAMETERS:  table_ptr       - Addressable pointer to the RSDT.
 196  *
 197  * RETURN:      Status
 198  *
 199  * DESCRIPTION: Validate signature for the RSDT or XSDT
 200  *
 201  ******************************************************************************/
 202
 203 acpi_status
 204 acpi_tb_validate_rsdt (
 205         struct acpi_table_header        *table_ptr)
 206 {
 207         int                             no_match;
 208
 209
 210         ACPI_FUNCTION_NAME ("tb_validate_rsdt");
 211
 212
 213         /*
 214          * For RSDP revision 0 or 1, we use the RSDT.
 215          * For RSDP revision 2 and above, we use the XSDT
 216          */
 217         if (acpi_gbl_RSDP->revision < 2) {
 218                 no_match = ACPI_STRNCMP ((char *) table_ptr, RSDT_SIG,
 219                                   sizeof (RSDT_SIG) -1);
 220         }
 221         else {
 222                 no_match = ACPI_STRNCMP ((char *) table_ptr, XSDT_SIG,
 223                                   sizeof (XSDT_SIG) -1);
 224         }
 225
 226         if (no_match) {
 227                 /* Invalid RSDT or XSDT signature */
 228
 229                 ACPI_REPORT_ERROR ((
 230                         "Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));
 231
 232                 ACPI_DUMP_BUFFER (acpi_gbl_RSDP, 20);
 233
 234                 ACPI_DEBUG_PRINT_RAW ((ACPI_DB_ERROR,
 235                         "RSDT/XSDT signature at %X (%p) is invalid\n",
 236                         acpi_gbl_RSDP->rsdt_physical_address,
 237                         (void *) (acpi_native_uint) acpi_gbl_RSDP->rsdt_physical_address));
 238
 239                 if (acpi_gbl_RSDP->revision < 2) {
 240                         ACPI_REPORT_ERROR (("Looking for RSDT (RSDP->Rev < 2)\n"))
 241                 }
 242                 else {
 243                         ACPI_REPORT_ERROR (("Looking for XSDT (RSDP->Rev >= 2)\n"))
 244                 }
 245
 246                 ACPI_DUMP_BUFFER ((char *) table_ptr, 48);
 247
 248                 return (AE_BAD_SIGNATURE);
 249         }
 250
 251         return (AE_OK);
 252 }
 253
 254
 255 /*******************************************************************************
 256  *
 257  * FUNCTION:    acpi_tb_get_table_rsdt
 258  *
 259  * PARAMETERS:  None
 260  *
 261  * RETURN:      Status
 262  *
 263  * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
 264  *
 265  ******************************************************************************/
 266
 267 acpi_status
 268 acpi_tb_get_table_rsdt (
 269         void)
 270 {
 271         struct acpi_table_desc          table_info;
 272         acpi_status                     status;
 273         struct acpi_pointer             address;
 274
 275
 276         ACPI_FUNCTION_TRACE ("tb_get_table_rsdt");
 277
 278
 279         /* Get the RSDT/XSDT via the RSDP */
 280
 281         acpi_tb_get_rsdt_address (&address);
 282
 283         table_info.type = ACPI_TABLE_XSDT;
 284         status = acpi_tb_get_table (&address, &table_info);
 285         if (ACPI_FAILURE (status)) {
 286                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not get the RSDT/XSDT, %s\n",
 287                         acpi_format_exception (status)));
 288
 289                 return_ACPI_STATUS (status);
 290         }
 291
 292         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 293                 "RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
 294                 acpi_gbl_RSDP,
 295                 ACPI_FORMAT_UINT64 (address.pointer.value)));
 296
 297         /* Check the RSDT or XSDT signature */
 298
 299         status = acpi_tb_validate_rsdt (table_info.pointer);
 300         if (ACPI_FAILURE (status)) {
 301                 return_ACPI_STATUS (status);
 302         }
 303
 304         /* Get the number of tables defined in the RSDT or XSDT */
 305
 306         acpi_gbl_rsdt_table_count = acpi_tb_get_table_count (acpi_gbl_RSDP,
 307                           table_info.pointer);
 308
 309         /* Convert and/or copy to an XSDT structure */
 310
 311         status = acpi_tb_convert_to_xsdt (&table_info);
 312         if (ACPI_FAILURE (status)) {
 313                 return_ACPI_STATUS (status);
 314         }
 315
 316         /* Save the table pointers and allocation info */
 317
 318         status = acpi_tb_init_table_descriptor (ACPI_TABLE_XSDT, &table_info);
 319         if (ACPI_FAILURE (status)) {
 320                 return_ACPI_STATUS (status);
 321         }
 322
 323         acpi_gbl_XSDT = ACPI_CAST_PTR (XSDT_DESCRIPTOR, table_info.pointer);
 324
 325         ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
 326         return_ACPI_STATUS (status);
 327 }
 328
 329