/****************************************************************************** * * Module Name: exstorob - AML Interpreter object store support, store to object * *****************************************************************************/ /* * Copyright (C) 2000 - 2007, R. Byron Moore * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include <acpi/acinterp.h> #define _COMPONENT ACPI_EXECUTER ACPI_MODULE_NAME("exstorob") /******************************************************************************* * * FUNCTION: acpi_ex_store_buffer_to_buffer * * PARAMETERS: source_desc - Source object to copy * target_desc - Destination object of the copy * * RETURN: Status * * DESCRIPTION: Copy a buffer object to another buffer object. * ******************************************************************************/ acpi_status acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc, union acpi_operand_object *target_desc) { u32 length; u8 *buffer; ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc); /* We know that source_desc is a buffer by now */ buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer); length = source_desc->buffer.length; /* * If target is a buffer of length zero or is a static buffer, * allocate a new buffer of the proper length */ if ((target_desc->buffer.length == 0) || (target_desc->common.flags & AOPOBJ_STATIC_POINTER)) { target_desc->buffer.pointer = ACPI_ALLOCATE(length); if (!target_desc->buffer.pointer) { return_ACPI_STATUS(AE_NO_MEMORY); } target_desc->buffer.length = length; } /* Copy source buffer to target buffer */ if (length <= target_desc->buffer.length) { /* Clear existing buffer and copy in the new one */ ACPI_MEMSET(target_desc->buffer.pointer, 0, target_desc->buffer.length); ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length); #ifdef ACPI_OBSOLETE_BEHAVIOR /* * NOTE: ACPI versions up to 3.0 specified that the buffer must be * truncated if the string is smaller than the buffer. However, "other" * implementations of ACPI never did this and thus became the defacto * standard. ACPI 3.0_a changes this behavior such that the buffer * is no longer truncated. */ /* * OBSOLETE BEHAVIOR: * If the original source was a string, we must truncate the buffer, * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer * copy must not truncate the original buffer. */ if (original_src_type == ACPI_TYPE_STRING) { /* Set the new length of the target */ target_desc->buffer.length = length; } #endif } else { /* Truncate the source, copy only what will fit */ ACPI_MEMCPY(target_desc->buffer.pointer, buffer, target_desc->buffer.length); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Truncating source buffer from %X to %X\n", length, target_desc->buffer.length)); } /* Copy flags */ target_desc->buffer.flags = source_desc->buffer.flags; target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ex_store_string_to_string * * PARAMETERS: source_desc - Source object to copy * target_desc - Destination object of the copy * * RETURN: Status * * DESCRIPTION: Copy a String object to another String object * ******************************************************************************/ acpi_status acpi_ex_store_string_to_string(union acpi_operand_object *source_desc, union acpi_operand_object *target_desc) { u32 length; u8 *buffer; ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc); /* We know that source_desc is a string by now */ buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer); length = source_desc->string.length; /* * Replace existing string value if it will fit and the string * pointer is not a static pointer (part of an ACPI table) */ if ((length < target_desc->string.length) && (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { /* * String will fit in existing non-static buffer. * Clear old string and copy in the new one */ ACPI_MEMSET(target_desc->string.pointer, 0, (acpi_size) target_desc->string.length + 1); ACPI_MEMCPY(target_desc->string.pointer, buffer, length); } else { /* * Free the current buffer, then allocate a new buffer * large enough to hold the value */ if (target_desc->string.pointer && (!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) { /* Only free if not a pointer into the DSDT */ ACPI_FREE(target_desc->string.pointer); } target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1); if (!target_desc->string.pointer) { return_ACPI_STATUS(AE_NO_MEMORY); } target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER; ACPI_MEMCPY(target_desc->string.pointer, buffer, length); } /* Set the new target length */ target_desc->string.length = length; return_ACPI_STATUS(AE_OK); }