kernel/drivers/acpi/acpica/tbprint.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbprint - Table output utilities
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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.
  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 <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "actables.h"
  47
  48 #define _COMPONENT          ACPI_TABLES
  49 ACPI_MODULE_NAME("tbprint")
  50
  51 /* Local prototypes */
  52 static void acpi_tb_fix_string(char *string, acpi_size length);
  53
  54 static void
  55 acpi_tb_cleanup_table_header(struct acpi_table_header *out_header,
  56                              struct acpi_table_header *header);
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_tb_fix_string
  61  *
  62  * PARAMETERS:  string              - String to be repaired
  63  *              length              - Maximum length
  64  *
  65  * RETURN:      None
  66  *
  67  * DESCRIPTION: Replace every non-printable or non-ascii byte in the string
  68  *              with a question mark '?'.
  69  *
  70  ******************************************************************************/
  71
  72 static void acpi_tb_fix_string(char *string, acpi_size length)
  73 {
  74
  75         while (length && *string) {
  76                 if (!ACPI_IS_PRINT(*string)) {
  77                         *string = '?';
  78                 }
  79                 string++;
  80                 length--;
  81         }
  82 }
  83
  84 /*******************************************************************************
  85  *
  86  * FUNCTION:    acpi_tb_cleanup_table_header
  87  *
  88  * PARAMETERS:  out_header          - Where the cleaned header is returned
  89  *              header              - Input ACPI table header
  90  *
  91  * RETURN:      Returns the cleaned header in out_header
  92  *
  93  * DESCRIPTION: Copy the table header and ensure that all "string" fields in
  94  *              the header consist of printable characters.
  95  *
  96  ******************************************************************************/
  97
  98 static void
  99 acpi_tb_cleanup_table_header(struct acpi_table_header *out_header,
 100                              struct acpi_table_header *header)
 101 {
 102
 103         ACPI_MEMCPY(out_header, header, sizeof(struct acpi_table_header));
 104
 105         acpi_tb_fix_string(out_header->signature, ACPI_NAME_SIZE);
 106         acpi_tb_fix_string(out_header->oem_id, ACPI_OEM_ID_SIZE);
 107         acpi_tb_fix_string(out_header->oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
 108         acpi_tb_fix_string(out_header->asl_compiler_id, ACPI_NAME_SIZE);
 109 }
 110
 111 /*******************************************************************************
 112  *
 113  * FUNCTION:    acpi_tb_print_table_header
 114  *
 115  * PARAMETERS:  address             - Table physical address
 116  *              header              - Table header
 117  *
 118  * RETURN:      None
 119  *
 120  * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
 121  *
 122  ******************************************************************************/
 123
 124 void
 125 acpi_tb_print_table_header(acpi_physical_address address,
 126                            struct acpi_table_header *header)
 127 {
 128         struct acpi_table_header local_header;
 129
 130         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
 131
 132                 /* FACS only has signature and length fields */
 133
 134                 ACPI_INFO((AE_INFO, "%-4.4s 0x%8.8X%8.8X %06X",
 135                            header->signature, ACPI_FORMAT_UINT64(address),
 136                            header->length));
 137         } else if (ACPI_VALIDATE_RSDP_SIG(header->signature)) {
 138
 139                 /* RSDP has no common fields */
 140
 141                 ACPI_MEMCPY(local_header.oem_id,
 142                             ACPI_CAST_PTR(struct acpi_table_rsdp,
 143                                           header)->oem_id, ACPI_OEM_ID_SIZE);
 144                 acpi_tb_fix_string(local_header.oem_id, ACPI_OEM_ID_SIZE);
 145
 146                 ACPI_INFO((AE_INFO, "RSDP 0x%8.8X%8.8X %06X (v%.2d %-6.6s)",
 147                            ACPI_FORMAT_UINT64(address),
 148                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
 149                             revision >
 150                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
 151                                                header)->length : 20,
 152                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 153                                          header)->revision,
 154                            local_header.oem_id));
 155         } else {
 156                 /* Standard ACPI table with full common header */
 157
 158                 acpi_tb_cleanup_table_header(&local_header, header);
 159
 160                 ACPI_INFO((AE_INFO,
 161                            "%-4.4s 0x%8.8X%8.8X"
 162                            " %06X (v%.2d %-6.6s %-8.8s %08X %-4.4s %08X)",
 163                            local_header.signature, ACPI_FORMAT_UINT64(address),
 164                            local_header.length, local_header.revision,
 165                            local_header.oem_id, local_header.oem_table_id,
 166                            local_header.oem_revision,
 167                            local_header.asl_compiler_id,
 168                            local_header.asl_compiler_revision));
 169         }
 170 }
 171
 172 /*******************************************************************************
 173  *
 174  * FUNCTION:    acpi_tb_validate_checksum
 175  *
 176  * PARAMETERS:  table               - ACPI table to verify
 177  *              length              - Length of entire table
 178  *
 179  * RETURN:      Status
 180  *
 181  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 182  *              exception on bad checksum.
 183  *
 184  ******************************************************************************/
 185
 186 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 187 {
 188         u8 checksum;
 189
 190         /*
 191          * FACS/S3PT:
 192          * They are the odd tables, have no standard ACPI header and no checksum
 193          */
 194
 195         if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_S3PT) ||
 196             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_FACS)) {
 197                 return (AE_OK);
 198         }
 199
 200         /* Compute the checksum on the table */
 201
 202         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 203
 204         /* Checksum ok? (should be zero) */
 205
 206         if (checksum) {
 207                 ACPI_BIOS_WARNING((AE_INFO,
 208                                    "Incorrect checksum in table [%4.4s] - 0x%2.2X, "
 209                                    "should be 0x%2.2X",
 210                                    table->signature, table->checksum,
 211                                    (u8)(table->checksum - checksum)));
 212
 213 #if (ACPI_CHECKSUM_ABORT)
 214                 return (AE_BAD_CHECKSUM);
 215 #endif
 216         }
 217
 218         return (AE_OK);
 219 }
 220
 221 /*******************************************************************************
 222  *
 223  * FUNCTION:    acpi_tb_checksum
 224  *
 225  * PARAMETERS:  buffer          - Pointer to memory region to be checked
 226  *              length          - Length of this memory region
 227  *
 228  * RETURN:      Checksum (u8)
 229  *
 230  * DESCRIPTION: Calculates circular checksum of memory region.
 231  *
 232  ******************************************************************************/
 233
 234 u8 acpi_tb_checksum(u8 *buffer, u32 length)
 235 {
 236         u8 sum = 0;
 237         u8 *end = buffer + length;
 238
 239         while (buffer < end) {
 240                 sum = (u8)(sum + *(buffer++));
 241         }
 242
 243         return (sum);
 244 }