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 (!isprint((int)*string)) {
  77                         *string = '?';
  78                 }
  79
  80                 string++;
  81                 length--;
  82         }
  83 }
  84
  85 /*******************************************************************************
  86  *
  87  * FUNCTION:    acpi_tb_cleanup_table_header
  88  *
  89  * PARAMETERS:  out_header          - Where the cleaned header is returned
  90  *              header              - Input ACPI table header
  91  *
  92  * RETURN:      Returns the cleaned header in out_header
  93  *
  94  * DESCRIPTION: Copy the table header and ensure that all "string" fields in
  95  *              the header consist of printable characters.
  96  *
  97  ******************************************************************************/
  98
  99 static void
 100 acpi_tb_cleanup_table_header(struct acpi_table_header *out_header,
 101                              struct acpi_table_header *header)
 102 {
 103
 104         memcpy(out_header, header, sizeof(struct acpi_table_header));
 105
 106         acpi_tb_fix_string(out_header->signature, ACPI_NAME_SIZE);
 107         acpi_tb_fix_string(out_header->oem_id, ACPI_OEM_ID_SIZE);
 108         acpi_tb_fix_string(out_header->oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
 109         acpi_tb_fix_string(out_header->asl_compiler_id, ACPI_NAME_SIZE);
 110 }
 111
 112 /*******************************************************************************
 113  *
 114  * FUNCTION:    acpi_tb_print_table_header
 115  *
 116  * PARAMETERS:  address             - Table physical address
 117  *              header              - Table header
 118  *
 119  * RETURN:      None
 120  *
 121  * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
 122  *
 123  ******************************************************************************/
 124
 125 void
 126 acpi_tb_print_table_header(acpi_physical_address address,
 127                            struct acpi_table_header *header)
 128 {
 129         struct acpi_table_header local_header;
 130
 131         if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
 132
 133                 /* FACS only has signature and length fields */
 134
 135                 ACPI_INFO((AE_INFO, "%-4.4s 0x%8.8X%8.8X %06X",
 136                            header->signature, ACPI_FORMAT_UINT64(address),
 137                            header->length));
 138         } else if (ACPI_VALIDATE_RSDP_SIG(header->signature)) {
 139
 140                 /* RSDP has no common fields */
 141
 142                 memcpy(local_header.oem_id,
 143                        ACPI_CAST_PTR(struct acpi_table_rsdp, header)->oem_id,
 144                        ACPI_OEM_ID_SIZE);
 145                 acpi_tb_fix_string(local_header.oem_id, ACPI_OEM_ID_SIZE);
 146
 147                 ACPI_INFO((AE_INFO, "RSDP 0x%8.8X%8.8X %06X (v%.2d %-6.6s)",
 148                            ACPI_FORMAT_UINT64(address),
 149                            (ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
 150                             revision >
 151                             0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
 152                                                header)->length : 20,
 153                            ACPI_CAST_PTR(struct acpi_table_rsdp,
 154                                          header)->revision,
 155                            local_header.oem_id));
 156         } else {
 157                 /* Standard ACPI table with full common header */
 158
 159                 acpi_tb_cleanup_table_header(&local_header, header);
 160
 161                 ACPI_INFO((AE_INFO,
 162                            "%-4.4s 0x%8.8X%8.8X"
 163                            " %06X (v%.2d %-6.6s %-8.8s %08X %-4.4s %08X)",
 164                            local_header.signature, ACPI_FORMAT_UINT64(address),
 165                            local_header.length, local_header.revision,
 166                            local_header.oem_id, local_header.oem_table_id,
 167                            local_header.oem_revision,
 168                            local_header.asl_compiler_id,
 169                            local_header.asl_compiler_revision));
 170         }
 171 }
 172
 173 /*******************************************************************************
 174  *
 175  * FUNCTION:    acpi_tb_validate_checksum
 176  *
 177  * PARAMETERS:  table               - ACPI table to verify
 178  *              length              - Length of entire table
 179  *
 180  * RETURN:      Status
 181  *
 182  * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
 183  *              exception on bad checksum.
 184  *
 185  ******************************************************************************/
 186
 187 acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
 188 {
 189         u8 checksum;
 190
 191         /*
 192          * FACS/S3PT:
 193          * They are the odd tables, have no standard ACPI header and no checksum
 194          */
 195
 196         if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_S3PT) ||
 197             ACPI_COMPARE_NAME(table->signature, ACPI_SIG_FACS)) {
 198                 return (AE_OK);
 199         }
 200
 201         /* Compute the checksum on the table */
 202
 203         checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
 204
 205         /* Checksum ok? (should be zero) */
 206
 207         if (checksum) {
 208                 ACPI_BIOS_WARNING((AE_INFO,
 209                                    "Incorrect checksum in table [%4.4s] - 0x%2.2X, "
 210                                    "should be 0x%2.2X",
 211                                    table->signature, table->checksum,
 212                                    (u8)(table->checksum - checksum)));
 213
 214 #if (ACPI_CHECKSUM_ABORT)
 215                 return (AE_BAD_CHECKSUM);
 216 #endif
 217         }
 218
 219         return (AE_OK);
 220 }
 221
 222 /*******************************************************************************
 223  *
 224  * FUNCTION:    acpi_tb_checksum
 225  *
 226  * PARAMETERS:  buffer          - Pointer to memory region to be checked
 227  *              length          - Length of this memory region
 228  *
 229  * RETURN:      Checksum (u8)
 230  *
 231  * DESCRIPTION: Calculates circular checksum of memory region.
 232  *
 233  ******************************************************************************/
 234
 235 u8 acpi_tb_checksum(u8 *buffer, u32 length)
 236 {
 237         u8 sum = 0;
 238         u8 *end = buffer + length;
 239
 240         while (buffer < end) {
 241                 sum = (u8)(sum + *(buffer++));
 242         }
 243
 244         return (sum);
 245 }