drivers/acpi/acpica/utexcep.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utexcep - Exception code support
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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 #define ACPI_DEFINE_EXCEPTION_TABLE
  45 #include <linux/export.h>
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48
  49 #define _COMPONENT          ACPI_UTILITIES
  50 ACPI_MODULE_NAME("utexcep")
  51
  52 /*******************************************************************************
  53  *
  54  * FUNCTION:    acpi_format_exception
  55  *
  56  * PARAMETERS:  status              - The acpi_status code to be formatted
  57  *
  58  * RETURN:      A string containing the exception text. A valid pointer is
  59  *              always returned.
  60  *
  61  * DESCRIPTION: This function translates an ACPI exception into an ASCII
  62  *              string. Returns "unknown status" string for invalid codes.
  63  *
  64  ******************************************************************************/
  65 const char *acpi_format_exception(acpi_status status)
  66 {
  67         const char *exception = NULL;
  68
  69         ACPI_FUNCTION_ENTRY();
  70
  71         exception = acpi_ut_validate_exception(status);
  72         if (!exception) {
  73
  74                 /* Exception code was not recognized */
  75
  76                 ACPI_ERROR((AE_INFO,
  77                             "Unknown exception code: 0x%8.8X", status));
  78
  79                 exception = "UNKNOWN_STATUS_CODE";
  80         }
  81
  82         return (ACPI_CAST_PTR(const char, exception));
  83 }
  84
  85 ACPI_EXPORT_SYMBOL(acpi_format_exception)
  86
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_ut_validate_exception
  90  *
  91  * PARAMETERS:  status              - The acpi_status code to be formatted
  92  *
  93  * RETURN:      A string containing the exception text. NULL if exception is
  94  *              not valid.
  95  *
  96  * DESCRIPTION: This function validates and translates an ACPI exception into
  97  *              an ASCII string.
  98  *
  99  ******************************************************************************/
 100 const char *acpi_ut_validate_exception(acpi_status status)
 101 {
 102         u32 sub_status;
 103         const char *exception = NULL;
 104
 105         ACPI_FUNCTION_ENTRY();
 106
 107         /*
 108          * Status is composed of two parts, a "type" and an actual code
 109          */
 110         sub_status = (status & ~AE_CODE_MASK);
 111
 112         switch (status & AE_CODE_MASK) {
 113         case AE_CODE_ENVIRONMENTAL:
 114
 115                 if (sub_status <= AE_CODE_ENV_MAX) {
 116                         exception = acpi_gbl_exception_names_env[sub_status];
 117                 }
 118                 break;
 119
 120         case AE_CODE_PROGRAMMER:
 121
 122                 if (sub_status <= AE_CODE_PGM_MAX) {
 123                         exception = acpi_gbl_exception_names_pgm[sub_status];
 124                 }
 125                 break;
 126
 127         case AE_CODE_ACPI_TABLES:
 128
 129                 if (sub_status <= AE_CODE_TBL_MAX) {
 130                         exception = acpi_gbl_exception_names_tbl[sub_status];
 131                 }
 132                 break;
 133
 134         case AE_CODE_AML:
 135
 136                 if (sub_status <= AE_CODE_AML_MAX) {
 137                         exception = acpi_gbl_exception_names_aml[sub_status];
 138                 }
 139                 break;
 140
 141         case AE_CODE_CONTROL:
 142
 143                 if (sub_status <= AE_CODE_CTRL_MAX) {
 144                         exception = acpi_gbl_exception_names_ctrl[sub_status];
 145                 }
 146                 break;
 147
 148         default:
 149                 break;
 150         }
 151
 152         return (ACPI_CAST_PTR(const char, exception));
 153 }