diff options
Diffstat (limited to 'drivers/acpi/acpica/exstorob.c')
| -rw-r--r-- | drivers/acpi/acpica/exstorob.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c new file mode 100644 index 000000000000..67340cc70142 --- /dev/null +++ b/drivers/acpi/acpica/exstorob.c @@ -0,0 +1,209 @@ + +/****************************************************************************** + * + * Module Name: exstorob - AML Interpreter object store support, store to object + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, Intel Corp. + * 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 "accommon.h" +#include "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); +} |
