1 2/****************************************************************************** 3 * 4 * Module Name: exstorob - AML Interpreter object store support, store to object 5 * 6 *****************************************************************************/ 7 8/* 9 * Copyright (C) 2000 - 2011, 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 50ACPI_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 ******************************************************************************/ 64acpi_status 65acpi_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 /* If Source and Target are the same, just return */ 74 75 if (source_desc == target_desc) { 76 return_ACPI_STATUS(AE_OK); 77 } 78 79 /* We know that source_desc is a buffer by now */ 80 81 buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); 82 length = source_desc->buffer.length; 83 84 /* 85 * If target is a buffer of length zero or is a static buffer, 86 * allocate a new buffer of the proper length 87 */ 88 if ((target_desc->buffer.length == 0) || 89 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { 90 target_desc->buffer.pointer = ACPI_ALLOCATE(length); 91 if (!target_desc->buffer.pointer) { 92 return_ACPI_STATUS(AE_NO_MEMORY); 93 } 94 95 target_desc->buffer.length = length; 96 } 97 98 /* Copy source buffer to target buffer */ 99 100 if (length <= target_desc->buffer.length) { 101 102 /* Clear existing buffer and copy in the new one */ 103 104 ACPI_MEMSET(target_desc->buffer.pointer, 0, 105 target_desc->buffer.length); 106 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); 107 108#ifdef ACPI_OBSOLETE_BEHAVIOR 109 /* 110 * NOTE: ACPI versions up to 3.0 specified that the buffer must be 111 * truncated if the string is smaller than the buffer. However, "other" 112 * implementations of ACPI never did this and thus became the defacto 113 * standard. ACPI 3.0_a changes this behavior such that the buffer 114 * is no longer truncated. 115 */ 116 117 /* 118 * OBSOLETE BEHAVIOR: 119 * If the original source was a string, we must truncate the buffer, 120 * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer 121 * copy must not truncate the original buffer. 122 */ 123 if (original_src_type == ACPI_TYPE_STRING) { 124 125 /* Set the new length of the target */ 126 127 target_desc->buffer.length = length; 128 } 129#endif 130 } else { 131 /* Truncate the source, copy only what will fit */ 132 133 ACPI_MEMCPY(target_desc->buffer.pointer, buffer, 134 target_desc->buffer.length); 135 136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 137 "Truncating source buffer from %X to %X\n", 138 length, target_desc->buffer.length)); 139 } 140 141 /* Copy flags */ 142 143 target_desc->buffer.flags = source_desc->buffer.flags; 144 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; 145 return_ACPI_STATUS(AE_OK); 146} 147 148/******************************************************************************* 149 * 150 * FUNCTION: acpi_ex_store_string_to_string 151 * 152 * PARAMETERS: source_desc - Source object to copy 153 * target_desc - Destination object of the copy 154 * 155 * RETURN: Status 156 * 157 * DESCRIPTION: Copy a String object to another String object 158 * 159 ******************************************************************************/ 160 161acpi_status 162acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, 163 union acpi_operand_object *target_desc) 164{ 165 u32 length; 166 u8 *buffer; 167 168 ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); 169 170 /* If Source and Target are the same, just return */ 171 172 if (source_desc == target_desc) { 173 return_ACPI_STATUS(AE_OK); 174 } 175 176 /* We know that source_desc is a string by now */ 177 178 buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); 179 length = source_desc->string.length; 180 181 /* 182 * Replace existing string value if it will fit and the string 183 * pointer is not a static pointer (part of an ACPI table) 184 */ 185 if ((length < target_desc->string.length) && 186 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { 187 /* 188 * String will fit in existing non-static buffer. 189 * Clear old string and copy in the new one 190 */ 191 ACPI_MEMSET(target_desc->string.pointer, 0, 192 (acpi_size) target_desc->string.length + 1); 193 ACPI_MEMCPY(target_desc->string.pointer, buffer, length); 194 } else { 195 /* 196 * Free the current buffer, then allocate a new buffer 197 * large enough to hold the value 198 */ 199 if (target_desc->string.pointer && 200 (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { 201 202 /* Only free if not a pointer into the DSDT */ 203 204 ACPI_FREE(target_desc->string.pointer); 205 } 206 207 target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) 208 length + 1); 209 if (!target_desc->string.pointer) { 210 return_ACPI_STATUS(AE_NO_MEMORY); 211 } 212 213 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; 214 ACPI_MEMCPY(target_desc->string.pointer, buffer, length); 215 } 216 217 /* Set the new target length */ 218 219 target_desc->string.length = length; 220 return_ACPI_STATUS(AE_OK); 221} 222