[deliverable/linux.git] / drivers / acpi / tables / tbfadt.c

/******************************************************************************
 *
 * Module Name: tbfadt   - FADT table utilities
 *
 *****************************************************************************/

/*
 * 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/actables.h>

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbfadt")

/* Local prototypes */
static void inline
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
			     u8 bit_width, u64 address);

static void acpi_tb_convert_fadt(void);

static void acpi_tb_validate_fadt(void);

/* Table for conversion of FADT to common internal format and FADT validation */

typedef struct acpi_fadt_info {
	char *name;
	u8 target;
	u8 source;
	u8 length;
	u8 type;

} acpi_fadt_info;

#define ACPI_FADT_REQUIRED          1
#define ACPI_FADT_SEPARATE_LENGTH   2

static struct acpi_fadt_info fadt_info_table[] = {
	{"Pm1aEventBlock", ACPI_FADT_OFFSET(xpm1a_event_block),
	 ACPI_FADT_OFFSET(pm1a_event_block),
	 ACPI_FADT_OFFSET(pm1_event_length), ACPI_FADT_REQUIRED},

	{"Pm1bEventBlock", ACPI_FADT_OFFSET(xpm1b_event_block),
	 ACPI_FADT_OFFSET(pm1b_event_block),
	 ACPI_FADT_OFFSET(pm1_event_length), 0},

	{"Pm1aControlBlock", ACPI_FADT_OFFSET(xpm1a_control_block),
	 ACPI_FADT_OFFSET(pm1a_control_block),
	 ACPI_FADT_OFFSET(pm1_control_length), ACPI_FADT_REQUIRED},

	{"Pm1bControlBlock", ACPI_FADT_OFFSET(xpm1b_control_block),
	 ACPI_FADT_OFFSET(pm1b_control_block),
	 ACPI_FADT_OFFSET(pm1_control_length), 0},

	{"Pm2ControlBlock", ACPI_FADT_OFFSET(xpm2_control_block),
	 ACPI_FADT_OFFSET(pm2_control_block),
	 ACPI_FADT_OFFSET(pm2_control_length), ACPI_FADT_SEPARATE_LENGTH},

	{"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block),
	 ACPI_FADT_OFFSET(pm_timer_block),
	 ACPI_FADT_OFFSET(pm_timer_length), ACPI_FADT_REQUIRED},

	{"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block),
	 ACPI_FADT_OFFSET(gpe0_block),
	 ACPI_FADT_OFFSET(gpe0_block_length), ACPI_FADT_SEPARATE_LENGTH},

	{"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block),
	 ACPI_FADT_OFFSET(gpe1_block),
	 ACPI_FADT_OFFSET(gpe1_block_length), ACPI_FADT_SEPARATE_LENGTH}
};

#define ACPI_FADT_INFO_ENTRIES        (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_init_generic_address
 *
 * PARAMETERS:  generic_address     - GAS struct to be initialized
 *              bit_width           - Width of this register
 *              Address             - Address of the register
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize a Generic Address Structure (GAS)
 *              See the ACPI specification for a full description and
 *              definition of this structure.
 *
 ******************************************************************************/

static void inline
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
			     u8 bit_width, u64 address)
{

	/*
	 * The 64-bit Address field is non-aligned in the byte packed
	 * GAS struct.
	 */
	ACPI_MOVE_64_TO_64(&generic_address->address, &address);

	/* All other fields are byte-wide */

	generic_address->space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	generic_address->bit_width = bit_width;
	generic_address->bit_offset = 0;
	generic_address->access_width = 0;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_parse_fadt
 *
 * PARAMETERS:  table_index         - Index for the FADT
 *              Flags               - Flags
 *
 * RETURN:      None
 *
 * DESCRIPTION: Initialize the FADT, DSDT and FACS tables
 *              (FADT contains the addresses of the DSDT and FACS)
 *
 ******************************************************************************/

void acpi_tb_parse_fadt(acpi_native_uint table_index, u8 flags)
{
	u32 length;
	struct acpi_table_header *table;

	/*
	 * The FADT has multiple versions with different lengths,
	 * and it contains pointers to both the DSDT and FACS tables.
	 *
	 * Get a local copy of the FADT and convert it to a common format
	 * Map entire FADT, assumed to be smaller than one page.
	 */
	length = acpi_gbl_root_table_list.tables[table_index].length;

	table =
	    acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
			       address, length);
	if (!table) {
		return;
	}

	/*
	 * Validate the FADT checksum before we copy the table. Ignore
	 * checksum error as we want to try to get the DSDT and FACS.
	 */
	(void)acpi_tb_verify_checksum(table, length);

	/* Obtain a local copy of the FADT in common ACPI 2.0+ format */

	acpi_tb_create_local_fadt(table, length);

	/* All done with the real FADT, unmap it */

	acpi_os_unmap_memory(table, length);

	/* Obtain the DSDT and FACS tables via their addresses within the FADT */

	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
			      flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);

	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
			      flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_create_local_fadt
 *
 * PARAMETERS:  Table               - Pointer to BIOS FADT
 *              Length              - Length of the table
 *
 * RETURN:      None
 *
 * DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
 *              Performs validation on some important FADT fields.
 *
 ******************************************************************************/

void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
{

	/*
	 * Check if the FADT is larger than what we know about (ACPI 2.0 version).
	 * Truncate the table, but make some noise.
	 */
	if (length > sizeof(struct acpi_table_fadt)) {
		ACPI_WARNING((AE_INFO,
			      "FADT (revision %u) is longer than ACPI 2.0 version, truncating length 0x%X to 0x%zX",
			      table->revision, (unsigned)length,
			      sizeof(struct acpi_table_fadt)));
	}

	/* Copy the entire FADT locally. Zero first for tb_convert_fadt */

	ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));

	ACPI_MEMCPY(&acpi_gbl_FADT, table,
		    ACPI_MIN(length, sizeof(struct acpi_table_fadt)));

	/*
	 * 1) Convert the local copy of the FADT to the common internal format
	 * 2) Validate some of the important values within the FADT
	 */
	acpi_tb_convert_fadt();
	acpi_tb_validate_fadt();
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_convert_fadt
 *
 * PARAMETERS:  None, uses acpi_gbl_FADT
 *
 * RETURN:      None
 *
 * DESCRIPTION: Converts all versions of the FADT to a common internal format.
 *              -> Expand all 32-bit addresses to 64-bit.
 *
 * NOTE:        acpi_gbl_FADT must be of size (struct acpi_table_fadt),
 *              and must contain a copy of the actual FADT.
 *
 * ACPICA will use the "X" fields of the FADT for all addresses.
 *
 * "X" fields are optional extensions to the original V1.0 fields. Even if
 * they are present in the structure, they can be optionally not used by
 * setting them to zero. Therefore, we must selectively expand V1.0 fields
 * if the corresponding X field is zero.
 *
 * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
 * "X" fields.
 *
 * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
 * expanding the corresponding ACPI 1.0 field.
 *
 ******************************************************************************/

static void acpi_tb_convert_fadt(void)
{
	u8 pm1_register_length;
	struct acpi_generic_address *target;
	acpi_native_uint i;

	/* Update the local FADT table header length */

	acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);

	/* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary */

	if (!acpi_gbl_FADT.Xfacs) {
		acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
	}

	if (!acpi_gbl_FADT.Xdsdt) {
		acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
	}

	/*
	 * Expand the 32-bit V1.0 addresses to the 64-bit "X" generic address
	 * structures as necessary.
	 */
	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
		target =
		    ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
				 fadt_info_table[i].target);

		/* Expand only if the X target is null */

		if (!target->address) {
			acpi_tb_init_generic_address(target,
						     *ACPI_ADD_PTR(u8,
								   &acpi_gbl_FADT,
								   fadt_info_table
								   [i].length),
						     (u64) * ACPI_ADD_PTR(u32,
									  &acpi_gbl_FADT,
									  fadt_info_table
									  [i].
									  source));
		}
	}

	/*
	 * Calculate separate GAS structs for the PM1 Enable registers.
	 * These addresses do not appear (directly) in the FADT, so it is
	 * useful to calculate them once, here.
	 *
	 * The PM event blocks are split into two register blocks, first is the
	 * PM Status Register block, followed immediately by the PM Enable Register
	 * block. Each is of length (pm1_event_length/2)
	 */
	pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length);

	/* The PM1A register block is required */

	acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
				     pm1_register_length,
				     (acpi_gbl_FADT.xpm1a_event_block.address +
				      pm1_register_length));
	/* Don't forget to copy space_id of the GAS */
	acpi_gbl_xpm1a_enable.space_id =
	    acpi_gbl_FADT.xpm1a_event_block.space_id;

	/* The PM1B register block is optional, ignore if not present */

	if (acpi_gbl_FADT.xpm1b_event_block.address) {
		acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
					     pm1_register_length,
					     (acpi_gbl_FADT.xpm1b_event_block.
					      address + pm1_register_length));
		/* Don't forget to copy space_id of the GAS */
		acpi_gbl_xpm1b_enable.space_id =
		    acpi_gbl_FADT.xpm1a_event_block.space_id;

	}

	/*
	 * For ACPI 1.0 FADTs, ensure that reserved fields (which should be zero)
	 * are indeed zero. This will workaround BIOSs that inadvertently placed
	 * values in these fields.
	 */
	if (acpi_gbl_FADT.header.revision < 3) {
		acpi_gbl_FADT.preferred_profile = 0;
		acpi_gbl_FADT.pstate_control = 0;
		acpi_gbl_FADT.cst_control = 0;
		acpi_gbl_FADT.boot_flags = 0;
	}
}

/******************************************************************************
 *
 * FUNCTION:    acpi_tb_validate_fadt
 *
 * PARAMETERS:  Table           - Pointer to the FADT to be validated
 *
 * RETURN:      None
 *
 * DESCRIPTION: Validate various important fields within the FADT. If a problem
 *              is found, issue a message, but no status is returned.
 *              Used by both the table manager and the disassembler.
 *
 * Possible additional checks:
 * (acpi_gbl_FADT.pm1_event_length >= 4)
 * (acpi_gbl_FADT.pm1_control_length >= 2)
 * (acpi_gbl_FADT.pm_timer_length >= 4)
 * Gpe block lengths must be multiple of 2
 *
 ******************************************************************************/

static void acpi_tb_validate_fadt(void)
{
	u32 *address32;
	struct acpi_generic_address *address64;
	u8 length;
	acpi_native_uint i;

	/* Examine all of the 64-bit extended address fields (X fields) */

	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {

		/* Generate pointers to the 32-bit and 64-bit addresses and get the length */

		address64 =
		    ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
				 fadt_info_table[i].target);
		address32 =
		    ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
				 fadt_info_table[i].source);
		length =
		    *ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
				  fadt_info_table[i].length);

		if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
			/*
			 * Field is required (Pm1a_event, Pm1a_control, pm_timer).
			 * Both the address and length must be non-zero.
			 */
			if (!address64->address || !length) {
				ACPI_ERROR((AE_INFO,
					    "Required field \"%s\" has zero address and/or length: %8.8X%8.8X/%X",
					    fadt_info_table[i].name,
					    ACPI_FORMAT_UINT64(address64->
							       address),
					    length));
			}
		} else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
			/*
			 * Field is optional (PM2Control, GPE0, GPE1) AND has its own
			 * length field. If present, both the address and length must be valid.
			 */
			if ((address64->address && !length)
			    || (!address64->address && length)) {
				ACPI_WARNING((AE_INFO,
					      "Optional field \"%s\" has zero address or length: %8.8X%8.8X/%X",
					      fadt_info_table[i].name,
					      ACPI_FORMAT_UINT64(address64->
								 address),
					      length));
			}
		}

		/* If both 32- and 64-bit addresses are valid (non-zero), they must match */

		if (address64->address && *address32 &&
		    (address64->address != (u64) * address32)) {
			ACPI_ERROR((AE_INFO,
				    "32/64X address mismatch in \"%s\": [%8.8X] [%8.8X%8.8X], using 64X",
				    fadt_info_table[i].name, *address32,
				    ACPI_FORMAT_UINT64(address64->address)));
		}
	}
}
Commit	Line	Data
95befdb3 BM	1	/******************************************************************************
	2	*
	3	* Module Name: tbfadt - FADT table utilities
	4	*
	5	*****************************************************************************/
	6
	7	/*
6c9deb72	8	* Copyright (C) 2000 - 2007, R. Byron Moore
95befdb3 BM	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
	44	#include <acpi/acpi.h>
	45	#include <acpi/actables.h>
	46
	47	#define _COMPONENT ACPI_TABLES
	48	ACPI_MODULE_NAME("tbfadt")
	49
	50	/* Local prototypes */
	51	static void inline
ea5d8ebc	52	acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
95befdb3 BM	53	u8 bit_width, u64 address);
95befdb3 BM	54
71392844 BM	55	static void acpi_tb_convert_fadt(void);
	56
	57	static void acpi_tb_validate_fadt(void);
	58
ea5d8ebc	59	/* Table for conversion of FADT to common internal format and FADT validation */
95befdb3	60
ea5d8ebc BM	61	typedef struct acpi_fadt_info {
ea5d8ebc BM	62	char *name;
95befdb3 BM	63	u8 target;
	64	u8 source;
	65	u8 length;
ea5d8ebc	66	u8 type;
95befdb3	67
ea5d8ebc	68	} acpi_fadt_info;
95befdb3	69
ea5d8ebc BM	70	#define ACPI_FADT_REQUIRED 1
	71	#define ACPI_FADT_SEPARATE_LENGTH 2
	72
	73	static struct acpi_fadt_info fadt_info_table[] = {
	74	{"Pm1aEventBlock", ACPI_FADT_OFFSET(xpm1a_event_block),
95befdb3	75	ACPI_FADT_OFFSET(pm1a_event_block),
ea5d8ebc BM	76	ACPI_FADT_OFFSET(pm1_event_length), ACPI_FADT_REQUIRED},
	77
	78	{"Pm1bEventBlock", ACPI_FADT_OFFSET(xpm1b_event_block),
95befdb3	79	ACPI_FADT_OFFSET(pm1b_event_block),
ea5d8ebc BM	80	ACPI_FADT_OFFSET(pm1_event_length), 0},
	81
	82	{"Pm1aControlBlock", ACPI_FADT_OFFSET(xpm1a_control_block),
95befdb3	83	ACPI_FADT_OFFSET(pm1a_control_block),
ea5d8ebc BM	84	ACPI_FADT_OFFSET(pm1_control_length), ACPI_FADT_REQUIRED},
	85
	86	{"Pm1bControlBlock", ACPI_FADT_OFFSET(xpm1b_control_block),
95befdb3	87	ACPI_FADT_OFFSET(pm1b_control_block),
ea5d8ebc BM	88	ACPI_FADT_OFFSET(pm1_control_length), 0},
	89
	90	{"Pm2ControlBlock", ACPI_FADT_OFFSET(xpm2_control_block),
95befdb3	91	ACPI_FADT_OFFSET(pm2_control_block),
ea5d8ebc BM	92	ACPI_FADT_OFFSET(pm2_control_length), ACPI_FADT_SEPARATE_LENGTH},
	93
	94	{"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block),
	95	ACPI_FADT_OFFSET(pm_timer_block),
	96	ACPI_FADT_OFFSET(pm_timer_length), ACPI_FADT_REQUIRED},
	97
	98	{"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block),
	99	ACPI_FADT_OFFSET(gpe0_block),
	100	ACPI_FADT_OFFSET(gpe0_block_length), ACPI_FADT_SEPARATE_LENGTH},
	101
	102	{"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block),
	103	ACPI_FADT_OFFSET(gpe1_block),
	104	ACPI_FADT_OFFSET(gpe1_block_length), ACPI_FADT_SEPARATE_LENGTH}
95befdb3 BM	105	};
95befdb3 BM	106
ea5d8ebc	107	#define ACPI_FADT_INFO_ENTRIES (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
95befdb3 BM	108
	109	/*******************************************************************************
	110	*
	111	* FUNCTION: acpi_tb_init_generic_address
	112	*
ea5d8ebc	113	* PARAMETERS: generic_address - GAS struct to be initialized
95befdb3 BM	114	* bit_width - Width of this register
	115	* Address - Address of the register
	116	*
	117	* RETURN: None
	118	*
ea5d8ebc BM	119	* DESCRIPTION: Initialize a Generic Address Structure (GAS)
	120	* See the ACPI specification for a full description and
	121	* definition of this structure.
95befdb3 BM	122	*
	123	******************************************************************************/
	124
	125	static void inline
ea5d8ebc	126	acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
95befdb3 BM	127	u8 bit_width, u64 address)
	128	{
	129
ea5d8ebc BM	130	/*
	131	* The 64-bit Address field is non-aligned in the byte packed
	132	* GAS struct.
	133	*/
	134	ACPI_MOVE_64_TO_64(&generic_address->address, &address);
	135
	136	/* All other fields are byte-wide */
	137
	138	generic_address->space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	139	generic_address->bit_width = bit_width;
	140	generic_address->bit_offset = 0;
	141	generic_address->access_width = 0;
95befdb3 BM	142	}
	143
	144	/*******************************************************************************
	145	*
	146	* FUNCTION: acpi_tb_parse_fadt
	147	*
	148	* PARAMETERS: table_index - Index for the FADT
	149	* Flags - Flags
	150	*
	151	* RETURN: None
	152	*
	153	* DESCRIPTION: Initialize the FADT, DSDT and FACS tables
	154	* (FADT contains the addresses of the DSDT and FACS)
	155	*
	156	******************************************************************************/
	157
	158	void acpi_tb_parse_fadt(acpi_native_uint table_index, u8 flags)
	159	{
	160	u32 length;
	161	struct acpi_table_header *table;
	162
	163	/*
ea5d8ebc BM	164	* The FADT has multiple versions with different lengths,
ea5d8ebc BM	165	* and it contains pointers to both the DSDT and FACS tables.
95befdb3 BM	166	*
	167	* Get a local copy of the FADT and convert it to a common format
	168	* Map entire FADT, assumed to be smaller than one page.
	169	*/
	170	length = acpi_gbl_root_table_list.tables[table_index].length;
	171
	172	table =
	173	acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
	174	address, length);
	175	if (!table) {
	176	return;
	177	}
	178
	179	/*
	180	* Validate the FADT checksum before we copy the table. Ignore
	181	* checksum error as we want to try to get the DSDT and FACS.
	182	*/
	183	(void)acpi_tb_verify_checksum(table, length);
	184
71392844 BM	185	/* Obtain a local copy of the FADT in common ACPI 2.0+ format */
	186
	187	acpi_tb_create_local_fadt(table, length);
	188
	189	/* All done with the real FADT, unmap it */
	190
	191	acpi_os_unmap_memory(table, length);
	192
	193	/* Obtain the DSDT and FACS tables via their addresses within the FADT */
	194
	195	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
	196	flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
	197
	198	acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
	199	flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
	200	}
	201
	202	/*******************************************************************************
	203	*
	204	* FUNCTION: acpi_tb_create_local_fadt
	205	*
	206	* PARAMETERS: Table - Pointer to BIOS FADT
	207	* Length - Length of the table
	208	*
	209	* RETURN: None
	210	*
	211	* DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
	212	* Performs validation on some important FADT fields.
	213	*
	214	******************************************************************************/
	215
	216	void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
	217	{
	218
ea5d8ebc	219	/*
71392844	220	* Check if the FADT is larger than what we know about (ACPI 2.0 version).
ea5d8ebc BM	221	* Truncate the table, but make some noise.
	222	*/
	223	if (length > sizeof(struct acpi_table_fadt)) {
	224	ACPI_WARNING((AE_INFO,
b0b7eaaf AS	225	"FADT (revision %u) is longer than ACPI 2.0 version, truncating length 0x%X to 0x%zX",
b0b7eaaf AS	226	table->revision, (unsigned)length,
ea5d8ebc BM	227	sizeof(struct acpi_table_fadt)));
ea5d8ebc BM	228	}
95befdb3	229
ea5d8ebc	230	/* Copy the entire FADT locally. Zero first for tb_convert_fadt */
95befdb3	231
ea5d8ebc	232	ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
71392844	233
95befdb3 BM	234	ACPI_MEMCPY(&acpi_gbl_FADT, table,
95befdb3 BM	235	ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
95befdb3	236
ea5d8ebc BM	237	/*
	238	* 1) Convert the local copy of the FADT to the common internal format
	239	* 2) Validate some of the important values within the FADT
	240	*/
95befdb3	241	acpi_tb_convert_fadt();
71392844	242	acpi_tb_validate_fadt();
95befdb3 BM	243	}
	244
	245	/*******************************************************************************
	246	*
	247	* FUNCTION: acpi_tb_convert_fadt
	248	*
	249	* PARAMETERS: None, uses acpi_gbl_FADT
	250	*
	251	* RETURN: None
	252	*
	253	* DESCRIPTION: Converts all versions of the FADT to a common internal format.
ea5d8ebc	254	* -> Expand all 32-bit addresses to 64-bit.
95befdb3	255	*
e56b638b BM	256	* NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
e56b638b BM	257	* and must contain a copy of the actual FADT.
95befdb3 BM	258	*
	259	* ACPICA will use the "X" fields of the FADT for all addresses.
	260	*
	261	* "X" fields are optional extensions to the original V1.0 fields. Even if
	262	* they are present in the structure, they can be optionally not used by
	263	* setting them to zero. Therefore, we must selectively expand V1.0 fields
	264	* if the corresponding X field is zero.
	265	*
	266	* For ACPI 1.0 FADTs, all address fields are expanded to the corresponding
	267	* "X" fields.
	268	*
	269	* For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by
	270	* expanding the corresponding ACPI 1.0 field.
	271	*
	272	******************************************************************************/
	273
71392844	274	static void acpi_tb_convert_fadt(void)
95befdb3 BM	275	{
	276	u8 pm1_register_length;
	277	struct acpi_generic_address *target;
	278	acpi_native_uint i;
	279
ea5d8ebc BM	280	/* Update the local FADT table header length */
	281
	282	acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
	283
	284	/* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary */
95befdb3 BM	285
	286	if (!acpi_gbl_FADT.Xfacs) {
	287	acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
	288	}
	289
	290	if (!acpi_gbl_FADT.Xdsdt) {
	291	acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
	292	}
	293
	294	/*
	295	* Expand the 32-bit V1.0 addresses to the 64-bit "X" generic address
	296	* structures as necessary.
	297	*/
ea5d8ebc	298	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
95befdb3 BM	299	target =
95befdb3 BM	300	ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
ea5d8ebc	301	fadt_info_table[i].target);
95befdb3 BM	302
	303	/* Expand only if the X target is null */
	304
	305	if (!target->address) {
	306	acpi_tb_init_generic_address(target,
	307	*ACPI_ADD_PTR(u8,
	308	&acpi_gbl_FADT,
ea5d8ebc	309	fadt_info_table
95befdb3 BM	310	[i].length),
	311	(u64) * ACPI_ADD_PTR(u32,
	312	&acpi_gbl_FADT,
ea5d8ebc	313	fadt_info_table
95befdb3 BM	314	[i].
	315	source));
	316	}
	317	}
	318
	319	/*
	320	* Calculate separate GAS structs for the PM1 Enable registers.
	321	* These addresses do not appear (directly) in the FADT, so it is
	322	* useful to calculate them once, here.
	323	*
	324	* The PM event blocks are split into two register blocks, first is the
	325	* PM Status Register block, followed immediately by the PM Enable Register
	326	* block. Each is of length (pm1_event_length/2)
	327	*/
	328	pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length);
	329
ea5d8ebc	330	/* The PM1A register block is required */
95befdb3 BM	331
	332	acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable,
	333	pm1_register_length,
	334	(acpi_gbl_FADT.xpm1a_event_block.address +
	335	pm1_register_length));
45eded87	336	/* Don't forget to copy space_id of the GAS */
fd350943 LB	337	acpi_gbl_xpm1a_enable.space_id =
fd350943 LB	338	acpi_gbl_FADT.xpm1a_event_block.space_id;
95befdb3	339
ea5d8ebc	340	/* The PM1B register block is optional, ignore if not present */
95befdb3 BM	341
	342	if (acpi_gbl_FADT.xpm1b_event_block.address) {
	343	acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable,
	344	pm1_register_length,
	345	(acpi_gbl_FADT.xpm1b_event_block.
	346	address + pm1_register_length));
45eded87	347	/* Don't forget to copy space_id of the GAS */
fd350943 LB	348	acpi_gbl_xpm1b_enable.space_id =
fd350943 LB	349	acpi_gbl_FADT.xpm1a_event_block.space_id;
45eded87	350
95befdb3	351	}
79fff270 BM	352
	353	/*
	354	* For ACPI 1.0 FADTs, ensure that reserved fields (which should be zero)
	355	* are indeed zero. This will workaround BIOSs that inadvertently placed
	356	* values in these fields.
	357	*/
	358	if (acpi_gbl_FADT.header.revision < 3) {
	359	acpi_gbl_FADT.preferred_profile = 0;
	360	acpi_gbl_FADT.pstate_control = 0;
	361	acpi_gbl_FADT.cst_control = 0;
	362	acpi_gbl_FADT.boot_flags = 0;
	363	}
95befdb3 BM	364	}
	365
	366	/******************************************************************************
	367	*
	368	* FUNCTION: acpi_tb_validate_fadt
	369	*
ea5d8ebc	370	* PARAMETERS: Table - Pointer to the FADT to be validated
95befdb3	371	*
e56b638b	372	* RETURN: None
95befdb3	373	*
ea5d8ebc BM	374	* DESCRIPTION: Validate various important fields within the FADT. If a problem
	375	* is found, issue a message, but no status is returned.
	376	* Used by both the table manager and the disassembler.
	377	*
	378	* Possible additional checks:
	379	* (acpi_gbl_FADT.pm1_event_length >= 4)
	380	* (acpi_gbl_FADT.pm1_control_length >= 2)
	381	* (acpi_gbl_FADT.pm_timer_length >= 4)
	382	* Gpe block lengths must be multiple of 2
95befdb3 BM	383	*
	384	******************************************************************************/
	385
71392844	386	static void acpi_tb_validate_fadt(void)
95befdb3	387	{
ea5d8ebc BM	388	u32 *address32;
	389	struct acpi_generic_address *address64;
	390	u8 length;
	391	acpi_native_uint i;
95befdb3	392
ea5d8ebc BM	393	/* Examine all of the 64-bit extended address fields (X fields) */
	394
	395	for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
	396
	397	/* Generate pointers to the 32-bit and 64-bit addresses and get the length */
	398
	399	address64 =
71392844	400	ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
ea5d8ebc	401	fadt_info_table[i].target);
71392844 BM	402	address32 =
	403	ACPI_ADD_PTR(u32, &acpi_gbl_FADT,
	404	fadt_info_table[i].source);
	405	length =
	406	*ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
	407	fadt_info_table[i].length);
ea5d8ebc BM	408
	409	if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
	410	/*
	411	* Field is required (Pm1a_event, Pm1a_control, pm_timer).
	412	* Both the address and length must be non-zero.
	413	*/
	414	if (!address64->address \|\| !length) {
	415	ACPI_ERROR((AE_INFO,
	416	"Required field \"%s\" has zero address and/or length: %8.8X%8.8X/%X",
	417	fadt_info_table[i].name,
	418	ACPI_FORMAT_UINT64(address64->
	419	address),
	420	length));
	421	}
	422	} else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
	423	/*
	424	* Field is optional (PM2Control, GPE0, GPE1) AND has its own
	425	* length field. If present, both the address and length must be valid.
	426	*/
	427	if ((address64->address && !length)
	428	\|\| (!address64->address && length)) {
	429	ACPI_WARNING((AE_INFO,
	430	"Optional field \"%s\" has zero address or length: %8.8X%8.8X/%X",
	431	fadt_info_table[i].name,
	432	ACPI_FORMAT_UINT64(address64->
	433	address),
	434	length));
	435	}
	436	}
95befdb3	437
ea5d8ebc	438	/* If both 32- and 64-bit addresses are valid (non-zero), they must match */
95befdb3	439
ea5d8ebc BM	440	if (address64->address && *address32 &&
	441	(address64->address != (u64) * address32)) {
	442	ACPI_ERROR((AE_INFO,
	443	"32/64X address mismatch in \"%s\": [%8.8X] [%8.8X%8.8X], using 64X",
	444	fadt_info_table[i].name, *address32,
	445	ACPI_FORMAT_UINT64(address64->address)));
	446	}
95befdb3 BM	447	}
95befdb3 BM	448	}