222 lines
7.0 KiB
C
222 lines
7.0 KiB
C
/******************************************************************************
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*
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* Module Name: exstorob - AML object store support, store to object
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2016, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exstorob")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_buffer_to_buffer
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*
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* PARAMETERS: source_desc - Source object to copy
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* target_desc - Destination object of the copy
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*
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* RETURN: Status
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*
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* DESCRIPTION: Copy a buffer object to another buffer object.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
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union acpi_operand_object *target_desc)
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{
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u32 length;
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u8 *buffer;
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ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
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/* If Source and Target are the same, just return */
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if (source_desc == target_desc) {
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return_ACPI_STATUS(AE_OK);
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}
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/* We know that source_desc is a buffer by now */
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buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
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length = source_desc->buffer.length;
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/*
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* If target is a buffer of length zero or is a static buffer,
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* allocate a new buffer of the proper length
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*/
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if ((target_desc->buffer.length == 0) ||
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(target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
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target_desc->buffer.pointer = ACPI_ALLOCATE(length);
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if (!target_desc->buffer.pointer) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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target_desc->buffer.length = length;
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}
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/* Copy source buffer to target buffer */
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if (length <= target_desc->buffer.length) {
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/* Clear existing buffer and copy in the new one */
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memset(target_desc->buffer.pointer, 0,
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target_desc->buffer.length);
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memcpy(target_desc->buffer.pointer, buffer, length);
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#ifdef ACPI_OBSOLETE_BEHAVIOR
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/*
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* NOTE: ACPI versions up to 3.0 specified that the buffer must be
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* truncated if the string is smaller than the buffer. However, "other"
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* implementations of ACPI never did this and thus became the defacto
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* standard. ACPI 3.0A changes this behavior such that the buffer
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* is no longer truncated.
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*/
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/*
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* OBSOLETE BEHAVIOR:
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* If the original source was a string, we must truncate the buffer,
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* according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
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* copy must not truncate the original buffer.
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*/
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if (original_src_type == ACPI_TYPE_STRING) {
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/* Set the new length of the target */
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target_desc->buffer.length = length;
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}
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#endif
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} else {
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/* Truncate the source, copy only what will fit */
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memcpy(target_desc->buffer.pointer, buffer,
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target_desc->buffer.length);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Truncating source buffer from %X to %X\n",
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length, target_desc->buffer.length));
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}
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/* Copy flags */
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target_desc->buffer.flags = source_desc->buffer.flags;
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target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_store_string_to_string
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*
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* PARAMETERS: source_desc - Source object to copy
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* target_desc - Destination object of the copy
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*
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* RETURN: Status
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*
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* DESCRIPTION: Copy a String object to another String object
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*
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******************************************************************************/
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acpi_status
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acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
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union acpi_operand_object *target_desc)
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{
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u32 length;
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u8 *buffer;
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ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
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/* If Source and Target are the same, just return */
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if (source_desc == target_desc) {
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return_ACPI_STATUS(AE_OK);
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}
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/* We know that source_desc is a string by now */
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buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
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length = source_desc->string.length;
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/*
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* Replace existing string value if it will fit and the string
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* pointer is not a static pointer (part of an ACPI table)
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*/
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if ((length < target_desc->string.length) &&
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(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
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/*
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* String will fit in existing non-static buffer.
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* Clear old string and copy in the new one
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*/
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memset(target_desc->string.pointer, 0,
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(acpi_size)target_desc->string.length + 1);
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memcpy(target_desc->string.pointer, buffer, length);
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} else {
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/*
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* Free the current buffer, then allocate a new buffer
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* large enough to hold the value
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*/
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if (target_desc->string.pointer &&
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(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
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/* Only free if not a pointer into the DSDT */
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ACPI_FREE(target_desc->string.pointer);
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}
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target_desc->string.pointer =
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ACPI_ALLOCATE_ZEROED((acpi_size)length + 1);
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if (!target_desc->string.pointer) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
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memcpy(target_desc->string.pointer, buffer, length);
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}
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/* Set the new target length */
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target_desc->string.length = length;
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return_ACPI_STATUS(AE_OK);
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}
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