[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / acpi / tables / tbget.c

/******************************************************************************
 *
 * Module Name: tbget - ACPI Table get* routines
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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/actables.h>

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbget")

/* Local prototypes */
static acpi_status
acpi_tb_get_this_table(struct acpi_pointer *address,
		       struct acpi_table_header *header,
		       struct acpi_table_desc *table_info);

static acpi_status
acpi_tb_table_override(struct acpi_table_header *header,
		       struct acpi_table_desc *table_info);

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              table_info          - Where table info is returned
 *
 * RETURN:      None
 *
 * DESCRIPTION: Get entire table of unknown size.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table(struct acpi_pointer *address,
		  struct acpi_table_desc *table_info)
{
	acpi_status status;
	struct acpi_table_header header;

	ACPI_FUNCTION_TRACE("tb_get_table");

	/* Get the header in order to get signature and table size */

	status = acpi_tb_get_table_header(address, &header);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Get the entire table */

	status = acpi_tb_get_table_body(address, &header, table_info);
	if (ACPI_FAILURE(status)) {
		ACPI_REPORT_ERROR(("Could not get ACPI table (size %X), %s\n",
				   header.length,
				   acpi_format_exception(status)));
		return_ACPI_STATUS(status);
	}

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_header
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              return_header       - Where the table header is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an ACPI table header.  Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_header(struct acpi_pointer *address,
			 struct acpi_table_header *return_header)
{
	acpi_status status = AE_OK;
	struct acpi_table_header *header = NULL;

	ACPI_FUNCTION_TRACE("tb_get_table_header");

	/*
	 * Flags contains the current processor mode (Virtual or Physical
	 * addressing) The pointer_type is either Logical or Physical
	 */
	switch (address->pointer_type) {
	case ACPI_PHYSMODE_PHYSPTR:
	case ACPI_LOGMODE_LOGPTR:

		/* Pointer matches processor mode, copy the header */

		ACPI_MEMCPY(return_header, address->pointer.logical,
			    sizeof(struct acpi_table_header));
		break;

	case ACPI_LOGMODE_PHYSPTR:

		/* Create a logical address for the physical pointer */

		status = acpi_os_map_memory(address->pointer.physical,
					    sizeof(struct acpi_table_header),
					    (void *)&header);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("Could not map memory at %8.8X%8.8X for length %X\n", ACPI_FORMAT_UINT64(address->pointer.physical), sizeof(struct acpi_table_header)));
			return_ACPI_STATUS(status);
		}

		/* Copy header and delete mapping */

		ACPI_MEMCPY(return_header, header,
			    sizeof(struct acpi_table_header));
		acpi_os_unmap_memory(header, sizeof(struct acpi_table_header));
		break;

	default:

		ACPI_REPORT_ERROR(("Invalid address flags %X\n",
				   address->pointer_type));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
			  return_header->signature));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_body
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              Header              - Header of the table to retrieve
 *              table_info          - Where the table info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
 *              replace the table with a newer version (table override.)
 *              Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_body(struct acpi_pointer *address,
		       struct acpi_table_header *header,
		       struct acpi_table_desc *table_info)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE("tb_get_table_body");

	if (!table_info || !address) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Attempt table override. */

	status = acpi_tb_table_override(header, table_info);
	if (ACPI_SUCCESS(status)) {
		/* Table was overridden by the host OS */

		return_ACPI_STATUS(status);
	}

	/* No override, get the original table */

	status = acpi_tb_get_this_table(address, header, table_info);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_table_override
 *
 * PARAMETERS:  Header              - Pointer to table header
 *              table_info          - Return info if table is overridden
 *
 * RETURN:      None
 *
 * DESCRIPTION: Attempts override of current table with a new one if provided
 *              by the host OS.
 *
 ******************************************************************************/

static acpi_status
acpi_tb_table_override(struct acpi_table_header *header,
		       struct acpi_table_desc *table_info)
{
	struct acpi_table_header *new_table;
	acpi_status status;
	struct acpi_pointer address;

	ACPI_FUNCTION_TRACE("tb_table_override");

	/*
	 * The OSL will examine the header and decide whether to override this
	 * table.  If it decides to override, a table will be returned in new_table,
	 * which we will then copy.
	 */
	status = acpi_os_table_override(header, &new_table);
	if (ACPI_FAILURE(status)) {
		/* Some severe error from the OSL, but we basically ignore it */

		ACPI_REPORT_ERROR(("Could not override ACPI table, %s\n",
				   acpi_format_exception(status)));
		return_ACPI_STATUS(status);
	}

	if (!new_table) {
		/* No table override */

		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
	}

	/*
	 * We have a new table to override the old one.  Get a copy of
	 * the new one.  We know that the new table has a logical pointer.
	 */
	address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
	address.pointer.logical = new_table;

	status = acpi_tb_get_this_table(&address, new_table, table_info);
	if (ACPI_FAILURE(status)) {
		ACPI_REPORT_ERROR(("Could not copy override ACPI table, %s\n",
				   acpi_format_exception(status)));
		return_ACPI_STATUS(status);
	}

	/* Copy the table info */

	ACPI_REPORT_INFO(("Table [%4.4s] replaced by host OS\n",
			  table_info->pointer->signature));

	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_this_table
 *
 * PARAMETERS:  Address             - Address of table to retrieve.  Can be
 *                                    Logical or Physical
 *              Header              - Header of the table to retrieve
 *              table_info          - Where the table info is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get an entire ACPI table.  Works in both physical or virtual
 *              addressing mode.  Works with both physical or logical pointers.
 *              Table is either copied or mapped, depending on the pointer
 *              type and mode of the processor.
 *
 ******************************************************************************/

static acpi_status
acpi_tb_get_this_table(struct acpi_pointer *address,
		       struct acpi_table_header *header,
		       struct acpi_table_desc *table_info)
{
	struct acpi_table_header *full_table = NULL;
	u8 allocation;
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE("tb_get_this_table");

	/*
	 * Flags contains the current processor mode (Virtual or Physical
	 * addressing) The pointer_type is either Logical or Physical
	 */
	switch (address->pointer_type) {
	case ACPI_PHYSMODE_PHYSPTR:
	case ACPI_LOGMODE_LOGPTR:

		/* Pointer matches processor mode, copy the table to a new buffer */

		full_table = ACPI_MEM_ALLOCATE(header->length);
		if (!full_table) {
			ACPI_REPORT_ERROR(("Could not allocate table memory for [%4.4s] length %X\n", header->signature, header->length));
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		/* Copy the entire table (including header) to the local buffer */

		ACPI_MEMCPY(full_table, address->pointer.logical,
			    header->length);

		/* Save allocation type */

		allocation = ACPI_MEM_ALLOCATED;
		break;

	case ACPI_LOGMODE_PHYSPTR:

		/*
		 * Just map the table's physical memory
		 * into our address space.
		 */
		status = acpi_os_map_memory(address->pointer.physical,
					    (acpi_size) header->length,
					    (void *)&full_table);
		if (ACPI_FAILURE(status)) {
			ACPI_REPORT_ERROR(("Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n", header->signature, ACPI_FORMAT_UINT64(address->pointer.physical), header->length));
			return (status);
		}

		/* Save allocation type */

		allocation = ACPI_MEM_MAPPED;
		break;

	default:

		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid address flags %X\n",
				  address->pointer_type));
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Validate checksum for _most_ tables,
	 * even the ones whose signature we don't recognize
	 */
	if (table_info->type != ACPI_TABLE_FACS) {
		status = acpi_tb_verify_table_checksum(full_table);

#if (!ACPI_CHECKSUM_ABORT)
		if (ACPI_FAILURE(status)) {
			/* Ignore the error if configuration says so */

			status = AE_OK;
		}
#endif
	}

	/* Return values */

	table_info->pointer = full_table;
	table_info->length = (acpi_size) header->length;
	table_info->allocation = allocation;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
			  full_table->signature,
			  ACPI_FORMAT_UINT64(address->pointer.physical),
			  full_table));

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_ptr
 *
 * PARAMETERS:  table_type      - one of the defined table types
 *              Instance        - Which table of this type
 *              table_ptr_loc   - pointer to location to place the pointer for
 *                                return
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to get the pointer to an ACPI table.
 *
 ******************************************************************************/

acpi_status
acpi_tb_get_table_ptr(acpi_table_type table_type,
		      u32 instance, struct acpi_table_header **table_ptr_loc)
{
	struct acpi_table_desc *table_desc;
	u32 i;

	ACPI_FUNCTION_TRACE("tb_get_table_ptr");

	if (!acpi_gbl_DSDT) {
		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
	}

	if (table_type > ACPI_TABLE_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * For all table types (Single/Multiple), the first
	 * instance is always in the list head.
	 */
	if (instance == 1) {
		/* Get the first */

		*table_ptr_loc = NULL;
		if (acpi_gbl_table_lists[table_type].next) {
			*table_ptr_loc =
			    acpi_gbl_table_lists[table_type].next->pointer;
		}
		return_ACPI_STATUS(AE_OK);
	}

	/* Check for instance out of range */

	if (instance > acpi_gbl_table_lists[table_type].count) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	/* Walk the list to get the desired table
	 * Since the if (Instance == 1) check above checked for the
	 * first table, setting table_desc equal to the .Next member
	 * is actually pointing to the second table.  Therefore, we
	 * need to walk from the 2nd table until we reach the Instance
	 * that the user is looking for and return its table pointer.
	 */
	table_desc = acpi_gbl_table_lists[table_type].next;
	for (i = 2; i < instance; i++) {
		table_desc = table_desc->next;
	}

	/* We are now pointing to the requested table's descriptor */

	*table_ptr_loc = table_desc->pointer;

	return_ACPI_STATUS(AE_OK);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: tbget - ACPI Table get* routines
	4	*
	5	*****************************************************************************/
	6
	7	/*
	8	* Copyright (C) 2000 - 2005, R. Byron Moore
	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
1da177e4 LT	44	#include <acpi/acpi.h>
	45	#include <acpi/actables.h>
	46
1da177e4	47	#define _COMPONENT ACPI_TABLES
4be44fcd	48	ACPI_MODULE_NAME("tbget")
1da177e4	49
44f6c012	50	/* Local prototypes */
44f6c012	51	static acpi_status
4be44fcd LB	52	acpi_tb_get_this_table(struct acpi_pointer *address,
	53	struct acpi_table_header *header,
	54	struct acpi_table_desc *table_info);
44f6c012 RM	55
44f6c012 RM	56	static acpi_status
4be44fcd LB	57	acpi_tb_table_override(struct acpi_table_header *header,
4be44fcd LB	58	struct acpi_table_desc *table_info);
1da177e4 LT	59
	60	/*******************************************************************************
	61	*
	62	* FUNCTION: acpi_tb_get_table
	63	*
	64	* PARAMETERS: Address - Address of table to retrieve. Can be
	65	* Logical or Physical
	66	* table_info - Where table info is returned
	67	*
	68	* RETURN: None
	69	*
	70	* DESCRIPTION: Get entire table of unknown size.
	71	*
	72	******************************************************************************/
	73
	74	acpi_status
4be44fcd LB	75	acpi_tb_get_table(struct acpi_pointer *address,
4be44fcd LB	76	struct acpi_table_desc *table_info)
1da177e4	77	{
4be44fcd LB	78	acpi_status status;
4be44fcd LB	79	struct acpi_table_header header;
1da177e4	80
4be44fcd	81	ACPI_FUNCTION_TRACE("tb_get_table");
1da177e4	82
44f6c012 RM	83	/* Get the header in order to get signature and table size */
44f6c012 RM	84
4be44fcd LB	85	status = acpi_tb_get_table_header(address, &header);
	86	if (ACPI_FAILURE(status)) {
	87	return_ACPI_STATUS(status);
1da177e4 LT	88	}
	89
	90	/* Get the entire table */
	91
4be44fcd LB	92	status = acpi_tb_get_table_body(address, &header, table_info);
	93	if (ACPI_FAILURE(status)) {
	94	ACPI_REPORT_ERROR(("Could not get ACPI table (size %X), %s\n",
	95	header.length,
	96	acpi_format_exception(status)));
	97	return_ACPI_STATUS(status);
1da177e4 LT	98	}
1da177e4 LT	99
4be44fcd	100	return_ACPI_STATUS(AE_OK);
1da177e4 LT	101	}
1da177e4 LT	102
1da177e4 LT	103	/*******************************************************************************
	104	*
	105	* FUNCTION: acpi_tb_get_table_header
	106	*
	107	* PARAMETERS: Address - Address of table to retrieve. Can be
	108	* Logical or Physical
	109	* return_header - Where the table header is returned
	110	*
	111	* RETURN: Status
	112	*
	113	* DESCRIPTION: Get an ACPI table header. Works in both physical or virtual
	114	* addressing mode. Works with both physical or logical pointers.
	115	* Table is either copied or mapped, depending on the pointer
	116	* type and mode of the processor.
	117	*
	118	******************************************************************************/
	119
	120	acpi_status
4be44fcd LB	121	acpi_tb_get_table_header(struct acpi_pointer *address,
4be44fcd LB	122	struct acpi_table_header *return_header)
1da177e4	123	{
4be44fcd LB	124	acpi_status status = AE_OK;
4be44fcd LB	125	struct acpi_table_header *header = NULL;
1da177e4	126
4be44fcd	127	ACPI_FUNCTION_TRACE("tb_get_table_header");
1da177e4 LT	128
1da177e4 LT	129	/*
44f6c012 RM	130	* Flags contains the current processor mode (Virtual or Physical
44f6c012 RM	131	* addressing) The pointer_type is either Logical or Physical
1da177e4 LT	132	*/
	133	switch (address->pointer_type) {
	134	case ACPI_PHYSMODE_PHYSPTR:
	135	case ACPI_LOGMODE_LOGPTR:
	136
	137	/* Pointer matches processor mode, copy the header */
	138
4be44fcd LB	139	ACPI_MEMCPY(return_header, address->pointer.logical,
4be44fcd LB	140	sizeof(struct acpi_table_header));
1da177e4 LT	141	break;
1da177e4 LT	142
1da177e4 LT	143	case ACPI_LOGMODE_PHYSPTR:
1da177e4 LT	144
4be44fcd	145	/* Create a logical address for the physical pointer */
1da177e4	146
4be44fcd LB	147	status = acpi_os_map_memory(address->pointer.physical,
	148	sizeof(struct acpi_table_header),
	149	(void *)&header);
	150	if (ACPI_FAILURE(status)) {
	151	ACPI_REPORT_ERROR(("Could not map memory at %8.8X%8.8X for length %X\n", ACPI_FORMAT_UINT64(address->pointer.physical), sizeof(struct acpi_table_header)));
	152	return_ACPI_STATUS(status);
1da177e4 LT	153	}
	154
	155	/* Copy header and delete mapping */
	156
4be44fcd LB	157	ACPI_MEMCPY(return_header, header,
	158	sizeof(struct acpi_table_header));
	159	acpi_os_unmap_memory(header, sizeof(struct acpi_table_header));
1da177e4 LT	160	break;
1da177e4 LT	161
1da177e4 LT	162	default:
1da177e4 LT	163
4be44fcd LB	164	ACPI_REPORT_ERROR(("Invalid address flags %X\n",
	165	address->pointer_type));
	166	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	167	}
1da177e4 LT	168
4be44fcd LB	169	ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
4be44fcd LB	170	return_header->signature));
1da177e4	171
4be44fcd	172	return_ACPI_STATUS(AE_OK);
1da177e4 LT	173	}
1da177e4 LT	174
1da177e4 LT	175	/*******************************************************************************
	176	*
	177	* FUNCTION: acpi_tb_get_table_body
	178	*
	179	* PARAMETERS: Address - Address of table to retrieve. Can be
	180	* Logical or Physical
	181	* Header - Header of the table to retrieve
	182	* table_info - Where the table info is returned
	183	*
	184	* RETURN: Status
	185	*
	186	* DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
	187	* replace the table with a newer version (table override.)
	188	* Works in both physical or virtual
	189	* addressing mode. Works with both physical or logical pointers.
	190	* Table is either copied or mapped, depending on the pointer
	191	* type and mode of the processor.
	192	*
	193	******************************************************************************/
	194
	195	acpi_status
4be44fcd LB	196	acpi_tb_get_table_body(struct acpi_pointer *address,
	197	struct acpi_table_header *header,
	198	struct acpi_table_desc *table_info)
1da177e4	199	{
4be44fcd	200	acpi_status status;
1da177e4	201
4be44fcd	202	ACPI_FUNCTION_TRACE("tb_get_table_body");
1da177e4 LT	203
1da177e4 LT	204	if (!table_info \|\| !address) {
4be44fcd	205	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	206	}
1da177e4 LT	207
44f6c012 RM	208	/* Attempt table override. */
44f6c012 RM	209
4be44fcd LB	210	status = acpi_tb_table_override(header, table_info);
4be44fcd LB	211	if (ACPI_SUCCESS(status)) {
1da177e4 LT	212	/* Table was overridden by the host OS */
1da177e4 LT	213
4be44fcd	214	return_ACPI_STATUS(status);
1da177e4 LT	215	}
	216
	217	/* No override, get the original table */
	218
4be44fcd LB	219	status = acpi_tb_get_this_table(address, header, table_info);
4be44fcd LB	220	return_ACPI_STATUS(status);
1da177e4 LT	221	}
1da177e4 LT	222
1da177e4 LT	223	/*******************************************************************************
	224	*
	225	* FUNCTION: acpi_tb_table_override
	226	*
	227	* PARAMETERS: Header - Pointer to table header
	228	* table_info - Return info if table is overridden
	229	*
	230	* RETURN: None
	231	*
	232	* DESCRIPTION: Attempts override of current table with a new one if provided
	233	* by the host OS.
	234	*
	235	******************************************************************************/
	236
44f6c012	237	static acpi_status
4be44fcd LB	238	acpi_tb_table_override(struct acpi_table_header *header,
4be44fcd LB	239	struct acpi_table_desc *table_info)
1da177e4	240	{
4be44fcd LB	241	struct acpi_table_header *new_table;
	242	acpi_status status;
	243	struct acpi_pointer address;
1da177e4	244
4be44fcd	245	ACPI_FUNCTION_TRACE("tb_table_override");
1da177e4 LT	246
	247	/*
	248	* The OSL will examine the header and decide whether to override this
	249	* table. If it decides to override, a table will be returned in new_table,
	250	* which we will then copy.
	251	*/
4be44fcd LB	252	status = acpi_os_table_override(header, &new_table);
4be44fcd LB	253	if (ACPI_FAILURE(status)) {
1da177e4 LT	254	/* Some severe error from the OSL, but we basically ignore it */
1da177e4 LT	255
4be44fcd LB	256	ACPI_REPORT_ERROR(("Could not override ACPI table, %s\n",
	257	acpi_format_exception(status)));
	258	return_ACPI_STATUS(status);
1da177e4 LT	259	}
	260
	261	if (!new_table) {
	262	/* No table override */
	263
4be44fcd	264	return_ACPI_STATUS(AE_NO_ACPI_TABLES);
1da177e4 LT	265	}
	266
	267	/*
	268	* We have a new table to override the old one. Get a copy of
	269	* the new one. We know that the new table has a logical pointer.
	270	*/
4be44fcd	271	address.pointer_type = ACPI_LOGICAL_POINTER \| ACPI_LOGICAL_ADDRESSING;
1da177e4 LT	272	address.pointer.logical = new_table;
1da177e4 LT	273
4be44fcd LB	274	status = acpi_tb_get_this_table(&address, new_table, table_info);
	275	if (ACPI_FAILURE(status)) {
	276	ACPI_REPORT_ERROR(("Could not copy override ACPI table, %s\n",
	277	acpi_format_exception(status)));
	278	return_ACPI_STATUS(status);
1da177e4 LT	279	}
	280
	281	/* Copy the table info */
	282
4be44fcd LB	283	ACPI_REPORT_INFO(("Table [%4.4s] replaced by host OS\n",
4be44fcd LB	284	table_info->pointer->signature));
1da177e4	285
4be44fcd	286	return_ACPI_STATUS(AE_OK);
1da177e4 LT	287	}
1da177e4 LT	288
1da177e4 LT	289	/*******************************************************************************
	290	*
	291	* FUNCTION: acpi_tb_get_this_table
	292	*
	293	* PARAMETERS: Address - Address of table to retrieve. Can be
	294	* Logical or Physical
	295	* Header - Header of the table to retrieve
	296	* table_info - Where the table info is returned
	297	*
	298	* RETURN: Status
	299	*
	300	* DESCRIPTION: Get an entire ACPI table. Works in both physical or virtual
	301	* addressing mode. Works with both physical or logical pointers.
	302	* Table is either copied or mapped, depending on the pointer
	303	* type and mode of the processor.
	304	*
	305	******************************************************************************/
	306
44f6c012	307	static acpi_status
4be44fcd LB	308	acpi_tb_get_this_table(struct acpi_pointer *address,
	309	struct acpi_table_header *header,
	310	struct acpi_table_desc *table_info)
1da177e4	311	{
4be44fcd LB	312	struct acpi_table_header *full_table = NULL;
	313	u8 allocation;
	314	acpi_status status = AE_OK;
1da177e4	315
4be44fcd	316	ACPI_FUNCTION_TRACE("tb_get_this_table");
1da177e4 LT	317
1da177e4 LT	318	/*
44f6c012 RM	319	* Flags contains the current processor mode (Virtual or Physical
44f6c012 RM	320	* addressing) The pointer_type is either Logical or Physical
1da177e4 LT	321	*/
	322	switch (address->pointer_type) {
	323	case ACPI_PHYSMODE_PHYSPTR:
	324	case ACPI_LOGMODE_LOGPTR:
	325
	326	/* Pointer matches processor mode, copy the table to a new buffer */
	327
4be44fcd	328	full_table = ACPI_MEM_ALLOCATE(header->length);
1da177e4	329	if (!full_table) {
4be44fcd LB	330	ACPI_REPORT_ERROR(("Could not allocate table memory for [%4.4s] length %X\n", header->signature, header->length));
4be44fcd LB	331	return_ACPI_STATUS(AE_NO_MEMORY);
1da177e4 LT	332	}
	333
	334	/* Copy the entire table (including header) to the local buffer */
	335
4be44fcd LB	336	ACPI_MEMCPY(full_table, address->pointer.logical,
4be44fcd LB	337	header->length);
1da177e4 LT	338
	339	/* Save allocation type */
	340
	341	allocation = ACPI_MEM_ALLOCATED;
	342	break;
	343
1da177e4 LT	344	case ACPI_LOGMODE_PHYSPTR:
	345
	346	/*
	347	* Just map the table's physical memory
	348	* into our address space.
	349	*/
4be44fcd LB	350	status = acpi_os_map_memory(address->pointer.physical,
	351	(acpi_size) header->length,
	352	(void *)&full_table);
	353	if (ACPI_FAILURE(status)) {
	354	ACPI_REPORT_ERROR(("Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X\n", header->signature, ACPI_FORMAT_UINT64(address->pointer.physical), header->length));
1da177e4 LT	355	return (status);
	356	}
	357
	358	/* Save allocation type */
	359
	360	allocation = ACPI_MEM_MAPPED;
	361	break;
	362
1da177e4 LT	363	default:
1da177e4 LT	364
4be44fcd LB	365	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid address flags %X\n",
	366	address->pointer_type));
	367	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	368	}
	369
	370	/*
	371	* Validate checksum for _most_ tables,
	372	* even the ones whose signature we don't recognize
	373	*/
	374	if (table_info->type != ACPI_TABLE_FACS) {
4be44fcd	375	status = acpi_tb_verify_table_checksum(full_table);
1da177e4 LT	376
1da177e4 LT	377	#if (!ACPI_CHECKSUM_ABORT)
4be44fcd	378	if (ACPI_FAILURE(status)) {
1da177e4 LT	379	/* Ignore the error if configuration says so */
	380
	381	status = AE_OK;
	382	}
	383	#endif
	384	}
	385
	386	/* Return values */
	387
4be44fcd LB	388	table_info->pointer = full_table;
	389	table_info->length = (acpi_size) header->length;
	390	table_info->allocation = allocation;
1da177e4	391
4be44fcd LB	392	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	393	"Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
	394	full_table->signature,
	395	ACPI_FORMAT_UINT64(address->pointer.physical),
	396	full_table));
1da177e4	397
4be44fcd	398	return_ACPI_STATUS(status);
1da177e4 LT	399	}
1da177e4 LT	400
1da177e4 LT	401	/*******************************************************************************
	402	*
	403	* FUNCTION: acpi_tb_get_table_ptr
	404	*
	405	* PARAMETERS: table_type - one of the defined table types
	406	* Instance - Which table of this type
	407	* table_ptr_loc - pointer to location to place the pointer for
	408	* return
	409	*
	410	* RETURN: Status
	411	*
	412	* DESCRIPTION: This function is called to get the pointer to an ACPI table.
	413	*
	414	******************************************************************************/
	415
	416	acpi_status
4be44fcd LB	417	acpi_tb_get_table_ptr(acpi_table_type table_type,
4be44fcd LB	418	u32 instance, struct acpi_table_header **table_ptr_loc)
1da177e4	419	{
4be44fcd LB	420	struct acpi_table_desc *table_desc;
4be44fcd LB	421	u32 i;
1da177e4	422
4be44fcd	423	ACPI_FUNCTION_TRACE("tb_get_table_ptr");
1da177e4 LT	424
1da177e4 LT	425	if (!acpi_gbl_DSDT) {
4be44fcd	426	return_ACPI_STATUS(AE_NO_ACPI_TABLES);
1da177e4 LT	427	}
	428
	429	if (table_type > ACPI_TABLE_MAX) {
4be44fcd	430	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	431	}
	432
	433	/*
	434	* For all table types (Single/Multiple), the first
	435	* instance is always in the list head.
	436	*/
	437	if (instance == 1) {
	438	/* Get the first */
	439
	440	*table_ptr_loc = NULL;
	441	if (acpi_gbl_table_lists[table_type].next) {
4be44fcd LB	442	*table_ptr_loc =
4be44fcd LB	443	acpi_gbl_table_lists[table_type].next->pointer;
1da177e4	444	}
4be44fcd	445	return_ACPI_STATUS(AE_OK);
1da177e4 LT	446	}
1da177e4 LT	447
44f6c012 RM	448	/* Check for instance out of range */
44f6c012 RM	449
1da177e4	450	if (instance > acpi_gbl_table_lists[table_type].count) {
4be44fcd	451	return_ACPI_STATUS(AE_NOT_EXIST);
1da177e4 LT	452	}
	453
	454	/* Walk the list to get the desired table
	455	* Since the if (Instance == 1) check above checked for the
	456	* first table, setting table_desc equal to the .Next member
	457	* is actually pointing to the second table. Therefore, we
	458	* need to walk from the 2nd table until we reach the Instance
	459	* that the user is looking for and return its table pointer.
	460	*/
	461	table_desc = acpi_gbl_table_lists[table_type].next;
	462	for (i = 2; i < instance; i++) {
	463	table_desc = table_desc->next;
	464	}
	465
	466	/* We are now pointing to the requested table's descriptor */
	467
	468	*table_ptr_loc = table_desc->pointer;
	469
4be44fcd	470	return_ACPI_STATUS(AE_OK);
1da177e4	471	}