drivers/acpi/acpica/utexcep.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: utexcep - Exception code support
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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/acpi.h>
  48 #include "accommon.h"
  49
  50 #define _COMPONENT          ACPI_UTILITIES
  51 ACPI_MODULE_NAME("utexcep")
  52
  53 /*******************************************************************************
  54  *
  55  * FUNCTION:    acpi_format_exception
  56  *
  57  * PARAMETERS:  status              - The acpi_status code to be formatted
  58  *
  59  * RETURN:      A string containing the exception text. A valid pointer is
  60  *              always returned.
  61  *
  62  * DESCRIPTION: This function translates an ACPI exception into an ASCII
  63  *              string. Returns "unknown status" string for invalid codes.
  64  *
  65  ******************************************************************************/
  66 const char *acpi_format_exception(acpi_status status)
  67 {
  68         const struct acpi_exception_info *exception;
  69
  70         ACPI_FUNCTION_ENTRY();
  71
  72         exception = acpi_ut_validate_exception(status);
  73         if (!exception) {
  74
  75                 /* Exception code was not recognized */
  76
  77                 ACPI_ERROR((AE_INFO,
  78                             "Unknown exception code: 0x%8.8X", status));
  79
  80                 return ("UNKNOWN_STATUS_CODE");
  81         }
  82
  83         return (exception->name);
  84 }
  85
  86 ACPI_EXPORT_SYMBOL(acpi_format_exception)
  87
  88 /*******************************************************************************
  89  *
  90  * FUNCTION:    acpi_ut_validate_exception
  91  *
  92  * PARAMETERS:  status              - The acpi_status code to be formatted
  93  *
  94  * RETURN:      A string containing the exception text. NULL if exception is
  95  *              not valid.
  96  *
  97  * DESCRIPTION: This function validates and translates an ACPI exception into
  98  *              an ASCII string.
  99  *
 100  ******************************************************************************/
 101 const struct acpi_exception_info *acpi_ut_validate_exception(acpi_status status)
 102 {
 103         u32 sub_status;
 104         const struct acpi_exception_info *exception = NULL;
 105
 106         ACPI_FUNCTION_ENTRY();
 107
 108         /*
 109          * Status is composed of two parts, a "type" and an actual code
 110          */
 111         sub_status = (status & ~AE_CODE_MASK);
 112
 113         switch (status & AE_CODE_MASK) {
 114         case AE_CODE_ENVIRONMENTAL:
 115
 116                 if (sub_status <= AE_CODE_ENV_MAX) {
 117                         exception = &acpi_gbl_exception_names_env[sub_status];
 118                 }
 119                 break;
 120
 121         case AE_CODE_PROGRAMMER:
 122
 123                 if (sub_status <= AE_CODE_PGM_MAX) {
 124                         exception = &acpi_gbl_exception_names_pgm[sub_status];
 125                 }
 126                 break;
 127
 128         case AE_CODE_ACPI_TABLES:
 129
 130                 if (sub_status <= AE_CODE_TBL_MAX) {
 131                         exception = &acpi_gbl_exception_names_tbl[sub_status];
 132                 }
 133                 break;
 134
 135         case AE_CODE_AML:
 136
 137                 if (sub_status <= AE_CODE_AML_MAX) {
 138                         exception = &acpi_gbl_exception_names_aml[sub_status];
 139                 }
 140                 break;
 141
 142         case AE_CODE_CONTROL:
 143
 144                 if (sub_status <= AE_CODE_CTRL_MAX) {
 145                         exception = &acpi_gbl_exception_names_ctrl[sub_status];
 146                 }
 147                 break;
 148
 149         default:
 150
 151                 break;
 152         }
 153
 154         if (!exception || !exception->name) {
 155                 return (NULL);
 156         }
 157
 158         return (exception);
 159 }