| 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: exstorob - AML object store support, store to object |
| 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 | #include "acpi.h" |
| 45 | #include "accommon.h" |
| 46 | #include "acinterp.h" |
| 47 | |
| 48 | |
| 49 | #define _COMPONENT ACPI_EXECUTER |
| 50 | ACPI_MODULE_NAME ("exstorob" ) |
| 51 | |
| 52 | |
| 53 | /******************************************************************************* |
| 54 | * |
| 55 | * FUNCTION: AcpiExStoreBufferToBuffer |
| 56 | * |
| 57 | * PARAMETERS: SourceDesc - Source object to copy |
| 58 | * TargetDesc - Destination object of the copy |
| 59 | * |
| 60 | * RETURN: Status |
| 61 | * |
| 62 | * DESCRIPTION: Copy a buffer object to another buffer object. |
| 63 | * |
| 64 | ******************************************************************************/ |
| 65 | |
| 66 | ACPI_STATUS |
| 67 | AcpiExStoreBufferToBuffer ( |
| 68 | ACPI_OPERAND_OBJECT *SourceDesc, |
| 69 | ACPI_OPERAND_OBJECT *TargetDesc) |
| 70 | { |
| 71 | UINT32 Length; |
| 72 | UINT8 *Buffer; |
| 73 | |
| 74 | |
| 75 | ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc); |
| 76 | |
| 77 | |
| 78 | /* If Source and Target are the same, just return */ |
| 79 | |
| 80 | if (SourceDesc == TargetDesc) |
| 81 | { |
| 82 | return_ACPI_STATUS (AE_OK); |
| 83 | } |
| 84 | |
| 85 | /* We know that SourceDesc is a buffer by now */ |
| 86 | |
| 87 | Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer); |
| 88 | Length = SourceDesc->Buffer.Length; |
| 89 | |
| 90 | /* |
| 91 | * If target is a buffer of length zero or is a static buffer, |
| 92 | * allocate a new buffer of the proper length |
| 93 | */ |
| 94 | if ((TargetDesc->Buffer.Length == 0) || |
| 95 | (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)) |
| 96 | { |
| 97 | TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length); |
| 98 | if (!TargetDesc->Buffer.Pointer) |
| 99 | { |
| 100 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 101 | } |
| 102 | |
| 103 | TargetDesc->Buffer.Length = Length; |
| 104 | } |
| 105 | |
| 106 | /* Copy source buffer to target buffer */ |
| 107 | |
| 108 | if (Length <= TargetDesc->Buffer.Length) |
| 109 | { |
| 110 | /* Clear existing buffer and copy in the new one */ |
| 111 | |
| 112 | memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length); |
| 113 | memcpy (TargetDesc->Buffer.Pointer, Buffer, Length); |
| 114 | |
| 115 | #ifdef ACPI_OBSOLETE_BEHAVIOR |
| 116 | /* |
| 117 | * NOTE: ACPI versions up to 3.0 specified that the buffer must be |
| 118 | * truncated if the string is smaller than the buffer. However, "other" |
| 119 | * implementations of ACPI never did this and thus became the defacto |
| 120 | * standard. ACPI 3.0A changes this behavior such that the buffer |
| 121 | * is no longer truncated. |
| 122 | */ |
| 123 | |
| 124 | /* |
| 125 | * OBSOLETE BEHAVIOR: |
| 126 | * If the original source was a string, we must truncate the buffer, |
| 127 | * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer |
| 128 | * copy must not truncate the original buffer. |
| 129 | */ |
| 130 | if (OriginalSrcType == ACPI_TYPE_STRING) |
| 131 | { |
| 132 | /* Set the new length of the target */ |
| 133 | |
| 134 | TargetDesc->Buffer.Length = Length; |
| 135 | } |
| 136 | #endif |
| 137 | } |
| 138 | else |
| 139 | { |
| 140 | /* Truncate the source, copy only what will fit */ |
| 141 | |
| 142 | memcpy (TargetDesc->Buffer.Pointer, Buffer, |
| 143 | TargetDesc->Buffer.Length); |
| 144 | |
| 145 | ACPI_DEBUG_PRINT ((ACPI_DB_INFO, |
| 146 | "Truncating source buffer from %X to %X\n" , |
| 147 | Length, TargetDesc->Buffer.Length)); |
| 148 | } |
| 149 | |
| 150 | /* Copy flags */ |
| 151 | |
| 152 | TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags; |
| 153 | TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; |
| 154 | return_ACPI_STATUS (AE_OK); |
| 155 | } |
| 156 | |
| 157 | |
| 158 | /******************************************************************************* |
| 159 | * |
| 160 | * FUNCTION: AcpiExStoreStringToString |
| 161 | * |
| 162 | * PARAMETERS: SourceDesc - Source object to copy |
| 163 | * TargetDesc - Destination object of the copy |
| 164 | * |
| 165 | * RETURN: Status |
| 166 | * |
| 167 | * DESCRIPTION: Copy a String object to another String object |
| 168 | * |
| 169 | ******************************************************************************/ |
| 170 | |
| 171 | ACPI_STATUS |
| 172 | AcpiExStoreStringToString ( |
| 173 | ACPI_OPERAND_OBJECT *SourceDesc, |
| 174 | ACPI_OPERAND_OBJECT *TargetDesc) |
| 175 | { |
| 176 | UINT32 Length; |
| 177 | UINT8 *Buffer; |
| 178 | |
| 179 | |
| 180 | ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc); |
| 181 | |
| 182 | |
| 183 | /* If Source and Target are the same, just return */ |
| 184 | |
| 185 | if (SourceDesc == TargetDesc) |
| 186 | { |
| 187 | return_ACPI_STATUS (AE_OK); |
| 188 | } |
| 189 | |
| 190 | /* We know that SourceDesc is a string by now */ |
| 191 | |
| 192 | Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer); |
| 193 | Length = SourceDesc->String.Length; |
| 194 | |
| 195 | /* |
| 196 | * Replace existing string value if it will fit and the string |
| 197 | * pointer is not a static pointer (part of an ACPI table) |
| 198 | */ |
| 199 | if ((Length < TargetDesc->String.Length) && |
| 200 | (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) |
| 201 | { |
| 202 | /* |
| 203 | * String will fit in existing non-static buffer. |
| 204 | * Clear old string and copy in the new one |
| 205 | */ |
| 206 | memset (TargetDesc->String.Pointer, 0, |
| 207 | (ACPI_SIZE) TargetDesc->String.Length + 1); |
| 208 | memcpy (TargetDesc->String.Pointer, Buffer, Length); |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | /* |
| 213 | * Free the current buffer, then allocate a new buffer |
| 214 | * large enough to hold the value |
| 215 | */ |
| 216 | if (TargetDesc->String.Pointer && |
| 217 | (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))) |
| 218 | { |
| 219 | /* Only free if not a pointer into the DSDT */ |
| 220 | |
| 221 | ACPI_FREE (TargetDesc->String.Pointer); |
| 222 | } |
| 223 | |
| 224 | TargetDesc->String.Pointer = |
| 225 | ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1); |
| 226 | |
| 227 | if (!TargetDesc->String.Pointer) |
| 228 | { |
| 229 | return_ACPI_STATUS (AE_NO_MEMORY); |
| 230 | } |
| 231 | |
| 232 | TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER; |
| 233 | memcpy (TargetDesc->String.Pointer, Buffer, Length); |
| 234 | } |
| 235 | |
| 236 | /* Set the new target length */ |
| 237 | |
| 238 | TargetDesc->String.Length = Length; |
| 239 | return_ACPI_STATUS (AE_OK); |
| 240 | } |
| 241 | |