drivers/acpi/executer/exstorob.c

   1
   2 /******************************************************************************
   3  *
   4  * Module Name: exstorob - AML Interpreter object store support, store to object
   5  *
   6  *****************************************************************************/
   7
   8 /*
   9  * Copyright (C) 2000 - 2004, R. Byron Moore
  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
  46 #include <acpi/acpi.h>
  47 #include <acpi/acinterp.h>
  48
  49
  50 #define _COMPONENT          ACPI_EXECUTER
  51          ACPI_MODULE_NAME    ("exstorob")
  52
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_ex_store_buffer_to_buffer
  57  *
  58  * PARAMETERS:  source_desc         - Source object to copy
  59  *              target_desc         - Destination object of the copy
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Copy a buffer object to another buffer object.
  64  *
  65  ******************************************************************************/
  66
  67 acpi_status
  68 acpi_ex_store_buffer_to_buffer (
  69         union acpi_operand_object       *source_desc,
  70         union acpi_operand_object       *target_desc)
  71 {
  72         u32                             length;
  73         u8                              *buffer;
  74
  75
  76         ACPI_FUNCTION_TRACE_PTR ("ex_store_buffer_to_buffer", source_desc);
  77
  78
  79         /*
  80          * We know that source_desc is a buffer by now
  81          */
  82         buffer = (u8 *) source_desc->buffer.pointer;
  83         length = source_desc->buffer.length;
  84
  85         /*
  86          * If target is a buffer of length zero or is a static buffer,
  87          * allocate a new buffer of the proper length
  88          */
  89         if ((target_desc->buffer.length == 0) ||
  90                 (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
  91                 target_desc->buffer.pointer = ACPI_MEM_ALLOCATE (length);
  92                 if (!target_desc->buffer.pointer) {
  93                         return_ACPI_STATUS (AE_NO_MEMORY);
  94                 }
  95
  96                 target_desc->buffer.length = length;
  97         }
  98
  99         /* Copy source buffer to target buffer */
 100
 101         if (length <= target_desc->buffer.length) {
 102                 /* Clear existing buffer and copy in the new one */
 103
 104                 ACPI_MEMSET (target_desc->buffer.pointer, 0, target_desc->buffer.length);
 105                 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, length);
 106
 107                 /* Set the new length of the target */
 108
 109                 target_desc->buffer.length = length;
 110         }
 111         else {
 112                 /* Truncate the source, copy only what will fit */
 113
 114                 ACPI_MEMCPY (target_desc->buffer.pointer, buffer, target_desc->buffer.length);
 115
 116                 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
 117                         "Truncating source buffer from %X to %X\n",
 118                         length, target_desc->buffer.length));
 119         }
 120
 121         /* Copy flags */
 122
 123         target_desc->buffer.flags = source_desc->buffer.flags;
 124         target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 125         return_ACPI_STATUS (AE_OK);
 126 }
 127
 128
 129 /*******************************************************************************
 130  *
 131  * FUNCTION:    acpi_ex_store_string_to_string
 132  *
 133  * PARAMETERS:  source_desc         - Source object to copy
 134  *              target_desc         - Destination object of the copy
 135  *
 136  * RETURN:      Status
 137  *
 138  * DESCRIPTION: Copy a String object to another String object
 139  *
 140  ******************************************************************************/
 141
 142 acpi_status
 143 acpi_ex_store_string_to_string (
 144         union acpi_operand_object       *source_desc,
 145         union acpi_operand_object       *target_desc)
 146 {
 147         u32                             length;
 148         u8                              *buffer;
 149
 150
 151         ACPI_FUNCTION_TRACE_PTR ("ex_store_string_to_string", source_desc);
 152
 153
 154         /*
 155          * We know that source_desc is a string by now.
 156          */
 157         buffer = (u8 *) source_desc->string.pointer;
 158         length = source_desc->string.length;
 159
 160         /*
 161          * Replace existing string value if it will fit and the string
 162          * pointer is not a static pointer (part of an ACPI table)
 163          */
 164         if ((length < target_desc->string.length) &&
 165            (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
 166                 /*
 167                  * String will fit in existing non-static buffer.
 168                  * Clear old string and copy in the new one
 169                  */
 170                 ACPI_MEMSET (target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1);
 171                 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
 172         }
 173         else {
 174                 /*
 175                  * Free the current buffer, then allocate a new buffer
 176                  * large enough to hold the value
 177                  */
 178                 if (target_desc->string.pointer &&
 179                    (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
 180                         /*
 181                          * Only free if not a pointer into the DSDT
 182                          */
 183                         ACPI_MEM_FREE (target_desc->string.pointer);
 184                 }
 185
 186                 target_desc->string.pointer = ACPI_MEM_CALLOCATE ((acpi_size) length + 1);
 187                 if (!target_desc->string.pointer) {
 188                         return_ACPI_STATUS (AE_NO_MEMORY);
 189                 }
 190
 191                 target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
 192                 ACPI_MEMCPY (target_desc->string.pointer, buffer, length);
 193         }
 194
 195         /* Set the new target length */
 196
 197         target_desc->string.length = length;
 198         return_ACPI_STATUS (AE_OK);
 199 }
 200
 201