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acpica-unix2-20130823
PANKOVs restructure
   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfroot - Find the root ACPI table (RSDT)
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2011, Intel Corp.
   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.


  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 #define __TBXFROOT_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "actables.h"
  49 
  50 
  51 #define _COMPONENT          ACPI_TABLES
  52         ACPI_MODULE_NAME    ("tbxfroot")
  53 
  54 /* Local prototypes */
  55 
  56 static UINT8 *
  57 AcpiTbScanMemoryForRsdp (
  58     UINT8                   *StartAddress,
  59     UINT32                  Length);
  60 
  61 static ACPI_STATUS
  62 AcpiTbValidateRsdp (
  63     ACPI_TABLE_RSDP         *Rsdp);
  64 
  65 
  66 /*******************************************************************************
  67  *
  68  * FUNCTION:    AcpiTbValidateRsdp
  69  *
  70  * PARAMETERS:  Rsdp                - Pointer to unvalidated RSDP
  71  *
  72  * RETURN:      Status
  73  *
  74  * DESCRIPTION: Validate the RSDP (ptr)
  75  *
  76  ******************************************************************************/
  77 
  78 static ACPI_STATUS
  79 AcpiTbValidateRsdp (
  80     ACPI_TABLE_RSDP         *Rsdp)
  81 {
  82     ACPI_FUNCTION_ENTRY ();
  83 
  84 
  85     /*
  86      * The signature and checksum must both be correct
  87      *
  88      * Note: Sometimes there exists more than one RSDP in memory; the valid
  89      * RSDP has a valid checksum, all others have an invalid checksum.
  90      */
  91     if (ACPI_STRNCMP ((char *) Rsdp, ACPI_SIG_RSDP,
  92             sizeof (ACPI_SIG_RSDP)-1) != 0)
  93     {
  94         /* Nope, BAD Signature */
  95 
  96         return (AE_BAD_SIGNATURE);
  97     }
  98 
  99     /* Check the standard checksum */
 100 
 101     if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
 102     {
 103         return (AE_BAD_CHECKSUM);
 104     }
 105 
 106     /* Check extended checksum if table version >= 2 */
 107 
 108     if ((Rsdp->Revision >= 2) &&
 109         (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0))
 110     {
 111         return (AE_BAD_CHECKSUM);
 112     }


 217 
 218         return_ACPI_STATUS (AE_NO_MEMORY);
 219     }
 220 
 221     MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
 222     AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
 223 
 224     if (MemRover)
 225     {
 226         /* Return the physical address */
 227 
 228         PhysicalAddress = (UINT32)
 229             (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr));
 230 
 231         *TableAddress = PhysicalAddress;
 232         return_ACPI_STATUS (AE_OK);
 233     }
 234 
 235     /* A valid RSDP was not found */
 236 
 237     ACPI_ERROR ((AE_INFO, "A valid RSDP was not found"));
 238     return_ACPI_STATUS (AE_NOT_FOUND);
 239 }
 240 
 241 ACPI_EXPORT_SYMBOL (AcpiFindRootPointer)
 242 
 243 
 244 /*******************************************************************************
 245  *
 246  * FUNCTION:    AcpiTbScanMemoryForRsdp
 247  *
 248  * PARAMETERS:  StartAddress        - Starting pointer for search
 249  *              Length              - Maximum length to search
 250  *
 251  * RETURN:      Pointer to the RSDP if found, otherwise NULL.
 252  *
 253  * DESCRIPTION: Search a block of memory for the RSDP signature
 254  *
 255  ******************************************************************************/
 256 
 257 static UINT8 *
 258 AcpiTbScanMemoryForRsdp (
 259     UINT8                   *StartAddress,
 260     UINT32                  Length)
 261 {
 262     ACPI_STATUS             Status;
 263     UINT8                   *MemRover;
 264     UINT8                   *EndAddress;
 265 
 266 
 267     ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
 268 
 269 
 270     EndAddress = StartAddress + Length;
 271 
 272     /* Search from given start address for the requested length */
 273 
 274     for (MemRover = StartAddress; MemRover < EndAddress;
 275          MemRover += ACPI_RSDP_SCAN_STEP)
 276     {
 277         /* The RSDP signature and checksum must both be correct */


 279         Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
 280         if (ACPI_SUCCESS (Status))
 281         {
 282             /* Sig and checksum valid, we have found a real RSDP */
 283 
 284             ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 285                 "RSDP located at physical address %p\n", MemRover));
 286             return_PTR (MemRover);
 287         }
 288 
 289         /* No sig match or bad checksum, keep searching */
 290     }
 291 
 292     /* Searched entire block, no RSDP was found */
 293 
 294     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 295         "Searched entire block from %p, valid RSDP was not found\n",
 296         StartAddress));
 297     return_PTR (NULL);
 298 }
 299 
   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfroot - Find the root ACPI table (RSDT)
   4  *
   5  *****************************************************************************/
   6 
   7 /*
   8  * Copyright (C) 2000 - 2013, Intel Corp.
   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.


  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 #define __TBXFROOT_C__
  45 
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "actables.h"
  49 
  50 
  51 #define _COMPONENT          ACPI_TABLES
  52         ACPI_MODULE_NAME    ("tbxfroot")
  53 

  54 










  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    AcpiTbValidateRsdp
  58  *
  59  * PARAMETERS:  Rsdp                - Pointer to unvalidated RSDP
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Validate the RSDP (ptr)
  64  *
  65  ******************************************************************************/
  66 
  67 ACPI_STATUS
  68 AcpiTbValidateRsdp (
  69     ACPI_TABLE_RSDP         *Rsdp)
  70 {

  71 

  72     /*
  73      * The signature and checksum must both be correct
  74      *
  75      * Note: Sometimes there exists more than one RSDP in memory; the valid
  76      * RSDP has a valid checksum, all others have an invalid checksum.
  77      */
  78     if (!ACPI_VALIDATE_RSDP_SIG (Rsdp->Signature))

  79     {
  80         /* Nope, BAD Signature */
  81 
  82         return (AE_BAD_SIGNATURE);
  83     }
  84 
  85     /* Check the standard checksum */
  86 
  87     if (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0)
  88     {
  89         return (AE_BAD_CHECKSUM);
  90     }
  91 
  92     /* Check extended checksum if table version >= 2 */
  93 
  94     if ((Rsdp->Revision >= 2) &&
  95         (AcpiTbChecksum ((UINT8 *) Rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0))
  96     {
  97         return (AE_BAD_CHECKSUM);
  98     }


 203 
 204         return_ACPI_STATUS (AE_NO_MEMORY);
 205     }
 206 
 207     MemRover = AcpiTbScanMemoryForRsdp (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
 208     AcpiOsUnmapMemory (TablePtr, ACPI_HI_RSDP_WINDOW_SIZE);
 209 
 210     if (MemRover)
 211     {
 212         /* Return the physical address */
 213 
 214         PhysicalAddress = (UINT32)
 215             (ACPI_HI_RSDP_WINDOW_BASE + ACPI_PTR_DIFF (MemRover, TablePtr));
 216 
 217         *TableAddress = PhysicalAddress;
 218         return_ACPI_STATUS (AE_OK);
 219     }
 220 
 221     /* A valid RSDP was not found */
 222 
 223     ACPI_BIOS_ERROR ((AE_INFO, "A valid RSDP was not found"));
 224     return_ACPI_STATUS (AE_NOT_FOUND);
 225 }
 226 
 227 ACPI_EXPORT_SYMBOL (AcpiFindRootPointer)
 228 
 229 
 230 /*******************************************************************************
 231  *
 232  * FUNCTION:    AcpiTbScanMemoryForRsdp
 233  *
 234  * PARAMETERS:  StartAddress        - Starting pointer for search
 235  *              Length              - Maximum length to search
 236  *
 237  * RETURN:      Pointer to the RSDP if found, otherwise NULL.
 238  *
 239  * DESCRIPTION: Search a block of memory for the RSDP signature
 240  *
 241  ******************************************************************************/
 242 
 243 UINT8 *
 244 AcpiTbScanMemoryForRsdp (
 245     UINT8                   *StartAddress,
 246     UINT32                  Length)
 247 {
 248     ACPI_STATUS             Status;
 249     UINT8                   *MemRover;
 250     UINT8                   *EndAddress;
 251 
 252 
 253     ACPI_FUNCTION_TRACE (TbScanMemoryForRsdp);
 254 
 255 
 256     EndAddress = StartAddress + Length;
 257 
 258     /* Search from given start address for the requested length */
 259 
 260     for (MemRover = StartAddress; MemRover < EndAddress;
 261          MemRover += ACPI_RSDP_SCAN_STEP)
 262     {
 263         /* The RSDP signature and checksum must both be correct */


 265         Status = AcpiTbValidateRsdp (ACPI_CAST_PTR (ACPI_TABLE_RSDP, MemRover));
 266         if (ACPI_SUCCESS (Status))
 267         {
 268             /* Sig and checksum valid, we have found a real RSDP */
 269 
 270             ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 271                 "RSDP located at physical address %p\n", MemRover));
 272             return_PTR (MemRover);
 273         }
 274 
 275         /* No sig match or bad checksum, keep searching */
 276     }
 277 
 278     /* Searched entire block, no RSDP was found */
 279 
 280     ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 281         "Searched entire block from %p, valid RSDP was not found\n",
 282         StartAddress));
 283     return_PTR (NULL);
 284 }