1 2 /****************************************************************************** 3 * 4 * Module Name: exstorob - AML Interpreter object store support, store to object 5 * 6 *****************************************************************************/ 7 8 /* 9 * Copyright (C) 2000 - 2008, Intel Corp. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer, 17 * without modification. 18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 19 * substantially similar to the "NO WARRANTY" disclaimer below 20 * ("Disclaimer") and any redistribution must be conditioned upon 21 * including a substantially similar Disclaimer requirement for further 22 * binary redistribution. 23 * 3. Neither the names of the above-listed copyright holders nor the names 24 * of any contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL") version 2 as published by the Free 29 * Software Foundation. 30 * 31 * NO WARRANTY 32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 42 * POSSIBILITY OF SUCH DAMAGES. 43 */ 44 45 #include <acpi/acpi.h> 46 #include "accommon.h" 47 #include "acinterp.h" 48 49 #define _COMPONENT ACPI_EXECUTER 50 ACPI_MODULE_NAME("exstorob") 51 52 /******************************************************************************* 53 * 54 * FUNCTION: acpi_ex_store_buffer_to_buffer 55 * 56 * PARAMETERS: source_desc - Source object to copy 57 * target_desc - Destination object of the copy 58 * 59 * RETURN: Status 60 * 61 * DESCRIPTION: Copy a buffer object to another buffer object. 62 * 63 ******************************************************************************/ 64 acpi_status 65 acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, 66 union acpi_operand_object *target_desc) 67 { 68 u32 length; 69 u8 *buffer; 70 71 ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc); 72 73 /* We know that source_desc is a buffer by now */ 74 75 buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); 76 length = source_desc->buffer.length; 77 78 /* 79 * If target is a buffer of length zero or is a static buffer, 80 * allocate a new buffer of the proper length 81 */ 82 if ((target_desc->buffer.length == 0) || 83 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { 84 target_desc->buffer.pointer = ACPI_ALLOCATE(length); 85 if (!target_desc->buffer.pointer) { 86 return_ACPI_STATUS(AE_NO_MEMORY); 87 } 88 89 target_desc->buffer.length = length; 90 } 91 92 /* Copy source buffer to target buffer */ 93 94 if (length <= target_desc->buffer.length) { 95 96 /* Clear existing buffer and copy in the new one */ 97 98 ACPI_MEMSET(target_desc->buffer.pointer, 0, 99 target_desc->buffer.length); 100 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); 101 102 #ifdef ACPI_OBSOLETE_BEHAVIOR 103 /* 104 * NOTE: ACPI versions up to 3.0 specified that the buffer must be 105 * truncated if the string is smaller than the buffer. However, "other" 106 * implementations of ACPI never did this and thus became the defacto 107 * standard. ACPI 3.0_a changes this behavior such that the buffer 108 * is no longer truncated. 109 */ 110 111 /* 112 * OBSOLETE BEHAVIOR: 113 * If the original source was a string, we must truncate the buffer, 114 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer 115 * copy must not truncate the original buffer. 116 */ 117 if (original_src_type == ACPI_TYPE_STRING) { 118 119 /* Set the new length of the target */ 120 121 target_desc->buffer.length = length; 122 } 123 #endif 124 } else { 125 /* Truncate the source, copy only what will fit */ 126 127 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, 128 target_desc->buffer.length); 129 130 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 131 "Truncating source buffer from %X to %X\n", 132 length, target_desc->buffer.length)); 133 } 134 135 /* Copy flags */ 136 137 target_desc->buffer.flags = source_desc->buffer.flags; 138 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; 139 return_ACPI_STATUS(AE_OK); 140 } 141 142 /******************************************************************************* 143 * 144 * FUNCTION: acpi_ex_store_string_to_string 145 * 146 * PARAMETERS: source_desc - Source object to copy 147 * target_desc - Destination object of the copy 148 * 149 * RETURN: Status 150 * 151 * DESCRIPTION: Copy a String object to another String object 152 * 153 ******************************************************************************/ 154 155 acpi_status 156 acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, 157 union acpi_operand_object *target_desc) 158 { 159 u32 length; 160 u8 *buffer; 161 162 ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); 163 164 /* We know that source_desc is a string by now */ 165 166 buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); 167 length = source_desc->string.length; 168 169 /* 170 * Replace existing string value if it will fit and the string 171 * pointer is not a static pointer (part of an ACPI table) 172 */ 173 if ((length < target_desc->string.length) && 174 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { 175 /* 176 * String will fit in existing non-static buffer. 177 * Clear old string and copy in the new one 178 */ 179 ACPI_MEMSET(target_desc->string.pointer, 0, 180 (acpi_size) target_desc->string.length + 1); 181 ACPI_MEMCPY(target_desc->string.pointer, buffer, length); 182 } else { 183 /* 184 * Free the current buffer, then allocate a new buffer 185 * large enough to hold the value 186 */ 187 if (target_desc->string.pointer && 188 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { 189 190 /* Only free if not a pointer into the DSDT */ 191 192 ACPI_FREE(target_desc->string.pointer); 193 } 194 195 target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) 196 length + 1); 197 if (!target_desc->string.pointer) { 198 return_ACPI_STATUS(AE_NO_MEMORY); 199 } 200 201 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; 202 ACPI_MEMCPY(target_desc->string.pointer, buffer, length); 203 } 204 205 /* Set the new target length */ 206 207 target_desc->string.length = length; 208 return_ACPI_STATUS(AE_OK); 209 } 210