arch/all-pc/acpica/source/components/executer/exstorob.c

   1 /******************************************************************************
   2  *
   3  * Module Name: exstorob - AML Interpreter object store support, store to object
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 __EXSTOROB_C__
  45
  46 #include "acpi.h"
  47 #include "accommon.h"
  48 #include "acinterp.h"
  49
  50
  51 #define _COMPONENT          ACPI_EXECUTER
  52         ACPI_MODULE_NAME    ("exstorob")
  53
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    AcpiExStoreBufferToBuffer
  58  *
  59  * PARAMETERS:  SourceDesc          - Source object to copy
  60  *              TargetDesc          - Destination object of the copy
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Copy a buffer object to another buffer object.
  65  *
  66  ******************************************************************************/
  67
  68 ACPI_STATUS
  69 AcpiExStoreBufferToBuffer (
  70     ACPI_OPERAND_OBJECT     *SourceDesc,
  71     ACPI_OPERAND_OBJECT     *TargetDesc)
  72 {
  73     UINT32                  Length;
  74     UINT8                   *Buffer;
  75
  76
  77     ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
  78
  79
  80     /* If Source and Target are the same, just return */
  81
  82     if (SourceDesc == TargetDesc)
  83     {
  84         return_ACPI_STATUS (AE_OK);
  85     }
  86
  87     /* We know that SourceDesc is a buffer by now */
  88
  89     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
  90     Length = SourceDesc->Buffer.Length;
  91
  92     /*
  93      * If target is a buffer of length zero or is a static buffer,
  94      * allocate a new buffer of the proper length
  95      */
  96     if ((TargetDesc->Buffer.Length == 0) ||
  97         (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
  98     {
  99         TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
 100         if (!TargetDesc->Buffer.Pointer)
 101         {
 102             return_ACPI_STATUS (AE_NO_MEMORY);
 103         }
 104
 105         TargetDesc->Buffer.Length = Length;
 106     }
 107
 108     /* Copy source buffer to target buffer */
 109
 110     if (Length <= TargetDesc->Buffer.Length)
 111     {
 112         /* Clear existing buffer and copy in the new one */
 113
 114         ACPI_MEMSET (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
 115         ACPI_MEMCPY (TargetDesc->Buffer.Pointer, Buffer, Length);
 116
 117 #ifdef ACPI_OBSOLETE_BEHAVIOR
 118         /*
 119          * NOTE: ACPI versions up to 3.0 specified that the buffer must be
 120          * truncated if the string is smaller than the buffer. However, "other"
 121          * implementations of ACPI never did this and thus became the defacto
 122          * standard. ACPI 3.0A changes this behavior such that the buffer
 123          * is no longer truncated.
 124          */
 125
 126         /*
 127          * OBSOLETE BEHAVIOR:
 128          * If the original source was a string, we must truncate the buffer,
 129          * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
 130          * copy must not truncate the original buffer.
 131          */
 132         if (OriginalSrcType == ACPI_TYPE_STRING)
 133         {
 134             /* Set the new length of the target */
 135
 136             TargetDesc->Buffer.Length = Length;
 137         }
 138 #endif
 139     }
 140     else
 141     {
 142         /* Truncate the source, copy only what will fit */
 143
 144         ACPI_MEMCPY (TargetDesc->Buffer.Pointer, Buffer,
 145             TargetDesc->Buffer.Length);
 146
 147         ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 148             "Truncating source buffer from %X to %X\n",
 149             Length, TargetDesc->Buffer.Length));
 150     }
 151
 152     /* Copy flags */
 153
 154     TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
 155     TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
 156     return_ACPI_STATUS (AE_OK);
 157 }
 158
 159
 160 /*******************************************************************************
 161  *
 162  * FUNCTION:    AcpiExStoreStringToString
 163  *
 164  * PARAMETERS:  SourceDesc          - Source object to copy
 165  *              TargetDesc          - Destination object of the copy
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Copy a String object to another String object
 170  *
 171  ******************************************************************************/
 172
 173 ACPI_STATUS
 174 AcpiExStoreStringToString (
 175     ACPI_OPERAND_OBJECT     *SourceDesc,
 176     ACPI_OPERAND_OBJECT     *TargetDesc)
 177 {
 178     UINT32                  Length;
 179     UINT8                   *Buffer;
 180
 181
 182     ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
 183
 184
 185     /* If Source and Target are the same, just return */
 186
 187     if (SourceDesc == TargetDesc)
 188     {
 189         return_ACPI_STATUS (AE_OK);
 190     }
 191
 192     /* We know that SourceDesc is a string by now */
 193
 194     Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
 195     Length = SourceDesc->String.Length;
 196
 197     /*
 198      * Replace existing string value if it will fit and the string
 199      * pointer is not a static pointer (part of an ACPI table)
 200      */
 201     if ((Length < TargetDesc->String.Length) &&
 202        (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
 203     {
 204         /*
 205          * String will fit in existing non-static buffer.
 206          * Clear old string and copy in the new one
 207          */
 208         ACPI_MEMSET (TargetDesc->String.Pointer, 0,
 209             (ACPI_SIZE) TargetDesc->String.Length + 1);
 210         ACPI_MEMCPY (TargetDesc->String.Pointer, Buffer, Length);
 211     }
 212     else
 213     {
 214         /*
 215          * Free the current buffer, then allocate a new buffer
 216          * large enough to hold the value
 217          */
 218         if (TargetDesc->String.Pointer &&
 219            (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
 220         {
 221             /* Only free if not a pointer into the DSDT */
 222
 223             ACPI_FREE (TargetDesc->String.Pointer);
 224         }
 225
 226         TargetDesc->String.Pointer = ACPI_ALLOCATE_ZEROED (
 227                                         (ACPI_SIZE) Length + 1);
 228         if (!TargetDesc->String.Pointer)
 229         {
 230             return_ACPI_STATUS (AE_NO_MEMORY);
 231         }
 232
 233         TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
 234         ACPI_MEMCPY (TargetDesc->String.Pointer, Buffer, Length);
 235     }
 236
 237     /* Set the new target length */
 238
 239     TargetDesc->String.Length = Length;
 240     return_ACPI_STATUS (AE_OK);
 241 }