drivers/bus/acpi/acpica/utilities/utexcep.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utexcep - Exception code support
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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 EXPORT_ACPI_INTERFACES
  45
  46 #define ACPI_DEFINE_EXCEPTION_TABLE
  47 #include "acpi.h"
  48 #include "accommon.h"
  49
  50
  51 #define _COMPONENT          ACPI_UTILITIES
  52         ACPI_MODULE_NAME    ("utexcep")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    AcpiFormatException
  58  *
  59  * PARAMETERS:  Status              - The ACPI_STATUS code to be formatted
  60  *
  61  * RETURN:      A string containing the exception text. A valid pointer is
  62  *              always returned.
  63  *
  64  * DESCRIPTION: This function translates an ACPI exception into an ASCII
  65  *              string. Returns "unknown status" string for invalid codes.
  66  *
  67  ******************************************************************************/
  68
  69 const char *
  70 AcpiFormatException (
  71     ACPI_STATUS             Status)
  72 {
  73     const ACPI_EXCEPTION_INFO   *Exception;
  74
  75
  76     ACPI_FUNCTION_ENTRY ();
  77
  78
  79     Exception = AcpiUtValidateException (Status);
  80     if (!Exception)
  81     {
  82         /* Exception code was not recognized */
  83
  84         ACPI_ERROR ((AE_INFO,
  85             "Unknown exception code: 0x%8.8X", Status));
  86
  87         return ("UNKNOWN_STATUS_CODE");
  88     }
  89
  90     return (Exception->Name);
  91 }
  92
  93 ACPI_EXPORT_SYMBOL (AcpiFormatException)
  94
  95
  96 /*******************************************************************************
  97  *
  98  * FUNCTION:    AcpiUtValidateException
  99  *
 100  * PARAMETERS:  Status              - The ACPI_STATUS code to be formatted
 101  *
 102  * RETURN:      A string containing the exception text. NULL if exception is
 103  *              not valid.
 104  *
 105  * DESCRIPTION: This function validates and translates an ACPI exception into
 106  *              an ASCII string.
 107  *
 108  ******************************************************************************/
 109
 110 const ACPI_EXCEPTION_INFO *
 111 AcpiUtValidateException (
 112     ACPI_STATUS             Status)
 113 {
 114     UINT32                      SubStatus;
 115     const ACPI_EXCEPTION_INFO   *Exception = NULL;
 116
 117
 118     ACPI_FUNCTION_ENTRY ();
 119
 120
 121     /*
 122      * Status is composed of two parts, a "type" and an actual code
 123      */
 124     SubStatus = (Status & ~AE_CODE_MASK);
 125
 126     switch (Status & AE_CODE_MASK)
 127     {
 128     case AE_CODE_ENVIRONMENTAL:
 129
 130         if (SubStatus <= AE_CODE_ENV_MAX)
 131         {
 132             Exception = &AcpiGbl_ExceptionNames_Env [SubStatus];
 133         }
 134         break;
 135
 136     case AE_CODE_PROGRAMMER:
 137
 138         if (SubStatus <= AE_CODE_PGM_MAX)
 139         {
 140             Exception = &AcpiGbl_ExceptionNames_Pgm [SubStatus];
 141         }
 142         break;
 143
 144     case AE_CODE_ACPI_TABLES:
 145
 146         if (SubStatus <= AE_CODE_TBL_MAX)
 147         {
 148             Exception = &AcpiGbl_ExceptionNames_Tbl [SubStatus];
 149         }
 150         break;
 151
 152     case AE_CODE_AML:
 153
 154         if (SubStatus <= AE_CODE_AML_MAX)
 155         {
 156             Exception = &AcpiGbl_ExceptionNames_Aml [SubStatus];
 157         }
 158         break;
 159
 160     case AE_CODE_CONTROL:
 161
 162         if (SubStatus <= AE_CODE_CTRL_MAX)
 163         {
 164             Exception = &AcpiGbl_ExceptionNames_Ctrl [SubStatus];
 165         }
 166         break;
 167
 168     default:
 169
 170         break;
 171     }
 172
 173     if (!Exception || !Exception->Name)
 174     {
 175         return (NULL);
 176     }
 177
 178     return (Exception);
 179 }