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 } 154