[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / acpica / exstorob.c


/******************************************************************************
 *
 * Module Name: exstorob - AML Interpreter object store support, store to object
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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);

	/* If Source and Target are the same, just return */

	if (source_desc == target_desc) {
		return_ACPI_STATUS(AE_OK);
	}

	/* 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);

	/* If Source and Target are the same, just return */

	if (source_desc == target_desc) {
		return_ACPI_STATUS(AE_OK);
	}

	/* 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);
}
Commit	Line	Data
1da177e4 LT	1
	2	/******************************************************************************
	3	*
	4	* Module Name: exstorob - AML Interpreter object store support, store to object
	5	*
	6	*****************************************************************************/
	7
	8	/*
77848130	9	* Copyright (C) 2000 - 2012, Intel Corp.
1da177e4 LT	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
1da177e4	45	#include <acpi/acpi.h>
e2f7a777 LB	46	#include "accommon.h"
e2f7a777 LB	47	#include "acinterp.h"
1da177e4	48
1da177e4	49	#define _COMPONENT ACPI_EXECUTER
4be44fcd	50	ACPI_MODULE_NAME("exstorob")
1da177e4 LT	51
	52	/*******************************************************************************
	53	*
	54	* FUNCTION: acpi_ex_store_buffer_to_buffer
	55	*
	56	* PARAMETERS: source_desc - Source object to copy
	57	* target_desc - Destination object of the copy
	58	*
	59	* RETURN: Status
	60	*
	61	* DESCRIPTION: Copy a buffer object to another buffer object.
	62	*
	63	******************************************************************************/
1da177e4	64	acpi_status
4be44fcd LB	65	acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
4be44fcd LB	66	union acpi_operand_object *target_desc)
1da177e4	67	{
4be44fcd LB	68	u32 length;
4be44fcd LB	69	u8 *buffer;
1da177e4	70
b229cf92	71	ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
1da177e4	72
b0de22bd LM	73	/* If Source and Target are the same, just return */
	74
	75	if (source_desc == target_desc) {
	76	return_ACPI_STATUS(AE_OK);
	77	}
	78
1da177e4 LT	79	/* We know that source_desc is a buffer by now */
1da177e4 LT	80
c51a4de8	81	buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
1da177e4 LT	82	length = source_desc->buffer.length;
	83
	84	/*
	85	* If target is a buffer of length zero or is a static buffer,
	86	* allocate a new buffer of the proper length
	87	*/
	88	if ((target_desc->buffer.length == 0) \|\|
4be44fcd	89	(target_desc->common.flags & AOPOBJ_STATIC_POINTER)) {
8313524a	90	target_desc->buffer.pointer = ACPI_ALLOCATE(length);
1da177e4	91	if (!target_desc->buffer.pointer) {
4be44fcd	92	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	93	}
	94
	95	target_desc->buffer.length = length;
	96	}
	97
	98	/* Copy source buffer to target buffer */
	99
	100	if (length <= target_desc->buffer.length) {
52fc0b02	101
1da177e4 LT	102	/* Clear existing buffer and copy in the new one */
1da177e4 LT	103
4be44fcd LB	104	ACPI_MEMSET(target_desc->buffer.pointer, 0,
	105	target_desc->buffer.length);
	106	ACPI_MEMCPY(target_desc->buffer.pointer, buffer, length);
1da177e4 LT	107
	108	#ifdef ACPI_OBSOLETE_BEHAVIOR
	109	/*
	110	* NOTE: ACPI versions up to 3.0 specified that the buffer must be
	111	* truncated if the string is smaller than the buffer. However, "other"
	112	* implementations of ACPI never did this and thus became the defacto
958dd242	113	* standard. ACPI 3.0_a changes this behavior such that the buffer
1da177e4 LT	114	* is no longer truncated.
	115	*/
	116
	117	/*
	118	* OBSOLETE BEHAVIOR:
	119	* If the original source was a string, we must truncate the buffer,
	120	* according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
	121	* copy must not truncate the original buffer.
	122	*/
	123	if (original_src_type == ACPI_TYPE_STRING) {
52fc0b02	124
1da177e4 LT	125	/* Set the new length of the target */
	126
	127	target_desc->buffer.length = length;
	128	}
	129	#endif
4be44fcd	130	} else {
1da177e4 LT	131	/* Truncate the source, copy only what will fit */
1da177e4 LT	132
4be44fcd LB	133	ACPI_MEMCPY(target_desc->buffer.pointer, buffer,
4be44fcd LB	134	target_desc->buffer.length);
1da177e4	135
4be44fcd LB	136	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	137	"Truncating source buffer from %X to %X\n",
	138	length, target_desc->buffer.length));
1da177e4 LT	139	}
	140
	141	/* Copy flags */
	142
	143	target_desc->buffer.flags = source_desc->buffer.flags;
	144	target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
4be44fcd	145	return_ACPI_STATUS(AE_OK);
1da177e4 LT	146	}
1da177e4 LT	147
1da177e4 LT	148	/*******************************************************************************
	149	*
	150	* FUNCTION: acpi_ex_store_string_to_string
	151	*
	152	* PARAMETERS: source_desc - Source object to copy
	153	* target_desc - Destination object of the copy
	154	*
	155	* RETURN: Status
	156	*
	157	* DESCRIPTION: Copy a String object to another String object
	158	*
	159	******************************************************************************/
	160
	161	acpi_status
4be44fcd LB	162	acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
4be44fcd LB	163	union acpi_operand_object *target_desc)
1da177e4	164	{
4be44fcd LB	165	u32 length;
4be44fcd LB	166	u8 *buffer;
1da177e4	167
b229cf92	168	ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
1da177e4	169
b0de22bd LM	170	/* If Source and Target are the same, just return */
	171
	172	if (source_desc == target_desc) {
	173	return_ACPI_STATUS(AE_OK);
	174	}
	175
1da177e4 LT	176	/* We know that source_desc is a string by now */
1da177e4 LT	177
c51a4de8	178	buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);
1da177e4 LT	179	length = source_desc->string.length;
	180
	181	/*
	182	* Replace existing string value if it will fit and the string
	183	* pointer is not a static pointer (part of an ACPI table)
	184	*/
	185	if ((length < target_desc->string.length) &&
4be44fcd	186	(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
1da177e4 LT	187	/*
	188	* String will fit in existing non-static buffer.
	189	* Clear old string and copy in the new one
	190	*/
4be44fcd LB	191	ACPI_MEMSET(target_desc->string.pointer, 0,
	192	(acpi_size) target_desc->string.length + 1);
	193	ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
	194	} else {
1da177e4 LT	195	/*
	196	* Free the current buffer, then allocate a new buffer
	197	* large enough to hold the value
	198	*/
	199	if (target_desc->string.pointer &&
4be44fcd	200	(!(target_desc->common.flags & AOPOBJ_STATIC_POINTER))) {
52fc0b02	201
1da177e4 LT	202	/* Only free if not a pointer into the DSDT */
1da177e4 LT	203
8313524a	204	ACPI_FREE(target_desc->string.pointer);
1da177e4 LT	205	}
1da177e4 LT	206
8313524a BM	207	target_desc->string.pointer = ACPI_ALLOCATE_ZEROED((acpi_size)
8313524a BM	208	length + 1);
1da177e4	209	if (!target_desc->string.pointer) {
4be44fcd	210	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	211	}
	212
	213	target_desc->common.flags &= ~AOPOBJ_STATIC_POINTER;
4be44fcd	214	ACPI_MEMCPY(target_desc->string.pointer, buffer, length);
1da177e4 LT	215	}
	216
	217	/* Set the new target length */
	218
	219	target_desc->string.length = length;
4be44fcd	220	return_ACPI_STATUS(AE_OK);
1da177e4	221	}