1 /******************************************************************************* 2 * 3 * Module Name: utexcep - Exception code support 4 * 5 ******************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2017, 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 } 160