[deliverable/linux.git] / drivers / acpi / acpica / tbutils.c

/******************************************************************************
 *
 * Module Name: tbutils - ACPI Table utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2016, 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 "actables.h"

#define _COMPONENT          ACPI_TABLES
ACPI_MODULE_NAME("tbutils")

/* Local prototypes */
static acpi_physical_address
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);

#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_initialize_facs
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
 *              for accessing the Global Lock and Firmware Waking Vector
 *
 ******************************************************************************/

acpi_status acpi_tb_initialize_facs(void)
{
	struct acpi_table_facs *facs;

	/* If Hardware Reduced flag is set, there is no FACS */

	if (acpi_gbl_reduced_hardware) {
		acpi_gbl_FACS = NULL;
		return (AE_OK);
	} else if (acpi_gbl_FADT.Xfacs &&
		   (!acpi_gbl_FADT.facs
		    || !acpi_gbl_use32_bit_facs_addresses)) {
		(void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
					      ACPI_CAST_INDIRECT_PTR(struct
								     acpi_table_header,
								     &facs));
		acpi_gbl_FACS = facs;
	} else if (acpi_gbl_FADT.facs) {
		(void)acpi_get_table_by_index(acpi_gbl_facs_index,
					      ACPI_CAST_INDIRECT_PTR(struct
								     acpi_table_header,
								     &facs));
		acpi_gbl_FACS = facs;
	}

	/* If there is no FACS, just continue. There was already an error msg */

	return (AE_OK);
}
#endif				/* !ACPI_REDUCED_HARDWARE */

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_check_dsdt_header
 *
 * PARAMETERS:  None
 *
 * RETURN:      None
 *
 * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
 *              if the DSDT has been replaced from outside the OS and/or if
 *              the DSDT header has been corrupted.
 *
 ******************************************************************************/

void acpi_tb_check_dsdt_header(void)
{

	/* Compare original length and checksum to current values */

	if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
	    acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
		ACPI_BIOS_ERROR((AE_INFO,
				 "The DSDT has been corrupted or replaced - "
				 "old, new headers below"));

		acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
		acpi_tb_print_table_header(0, acpi_gbl_DSDT);

		ACPI_ERROR((AE_INFO,
			    "Please send DMI info to linux-acpi@vger.kernel.org\n"
			    "If system does not work as expected, please boot with acpi=copy_dsdt"));

		/* Disable further error messages */

		acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
		acpi_gbl_original_dsdt_header.checksum =
		    acpi_gbl_DSDT->checksum;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_copy_dsdt
 *
 * PARAMETERS:  table_desc          - Installed table to copy
 *
 * RETURN:      None
 *
 * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
 *              Some very bad BIOSs are known to either corrupt the DSDT or
 *              install a new, bad DSDT. This copy works around the problem.
 *
 ******************************************************************************/

struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
{
	struct acpi_table_header *new_table;
	struct acpi_table_desc *table_desc;

	table_desc = &acpi_gbl_root_table_list.tables[table_index];

	new_table = ACPI_ALLOCATE(table_desc->length);
	if (!new_table) {
		ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
			    table_desc->length));
		return (NULL);
	}

	memcpy(new_table, table_desc->pointer, table_desc->length);
	acpi_tb_uninstall_table(table_desc);

	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
				      tables[acpi_gbl_dsdt_index],
				      ACPI_PTR_TO_PHYSADDR(new_table),
				      ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
				      new_table);

	ACPI_INFO((AE_INFO,
		   "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
		   new_table->length));

	return (new_table);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_root_table_entry
 *
 * PARAMETERS:  table_entry         - Pointer to the RSDT/XSDT table entry
 *              table_entry_size    - sizeof 32 or 64 (RSDT or XSDT)
 *
 * RETURN:      Physical address extracted from the root table
 *
 * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
 *              both 32-bit and 64-bit platforms
 *
 * NOTE:        acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
 *              64-bit platforms.
 *
 ******************************************************************************/

static acpi_physical_address
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
{
	u64 address64;

	/*
	 * Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
	 * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
	 */
	if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
		/*
		 * 32-bit platform, RSDT: Return 32-bit table entry
		 * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
		 */
		return ((acpi_physical_address)
			(*ACPI_CAST_PTR(u32, table_entry)));
	} else {
		/*
		 * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
		 * 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
		 *  return 64-bit
		 */
		ACPI_MOVE_64_TO_64(&address64, table_entry);

#if ACPI_MACHINE_WIDTH == 32
		if (address64 > ACPI_UINT32_MAX) {

			/* Will truncate 64-bit address to 32 bits, issue warning */

			ACPI_BIOS_WARNING((AE_INFO,
					   "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
					   " truncating",
					   ACPI_FORMAT_UINT64(address64)));
		}
#endif
		return ((acpi_physical_address) (address64));
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_parse_root_table
 *
 * PARAMETERS:  rsdp                    - Pointer to the RSDP
 *
 * RETURN:      Status
 *
 * DESCRIPTION: This function is called to parse the Root System Description
 *              Table (RSDT or XSDT)
 *
 * NOTE:        Tables are mapped (not copied) for efficiency. The FACS must
 *              be mapped and cannot be copied because it contains the actual
 *              memory location of the ACPI Global Lock.
 *
 ******************************************************************************/

acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
{
	struct acpi_table_rsdp *rsdp;
	u32 table_entry_size;
	u32 i;
	u32 table_count;
	struct acpi_table_header *table;
	acpi_physical_address address;
	u32 length;
	u8 *table_entry;
	acpi_status status;
	u32 table_index;

	ACPI_FUNCTION_TRACE(tb_parse_root_table);

	/* Map the entire RSDP and extract the address of the RSDT or XSDT */

	rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
	if (!rsdp) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(rsdp_address,
				   ACPI_CAST_PTR(struct acpi_table_header,
						 rsdp));

	/* Use XSDT if present and not overridden. Otherwise, use RSDT */

	if ((rsdp->revision > 1) &&
	    rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
		/*
		 * RSDP contains an XSDT (64-bit physical addresses). We must use
		 * the XSDT if the revision is > 1 and the XSDT pointer is present,
		 * as per the ACPI specification.
		 */
		address = (acpi_physical_address) rsdp->xsdt_physical_address;
		table_entry_size = ACPI_XSDT_ENTRY_SIZE;
	} else {
		/* Root table is an RSDT (32-bit physical addresses) */

		address = (acpi_physical_address) rsdp->rsdt_physical_address;
		table_entry_size = ACPI_RSDT_ENTRY_SIZE;
	}

	/*
	 * It is not possible to map more than one entry in some environments,
	 * so unmap the RSDP here before mapping other tables
	 */
	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));

	/* Map the RSDT/XSDT table header to get the full table length */

	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	acpi_tb_print_table_header(address, table);

	/*
	 * Validate length of the table, and map entire table.
	 * Minimum length table must contain at least one entry.
	 */
	length = table->length;
	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));

	if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
		ACPI_BIOS_ERROR((AE_INFO,
				 "Invalid table length 0x%X in RSDT/XSDT",
				 length));
		return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
	}

	table = acpi_os_map_memory(address, length);
	if (!table) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	/* Validate the root table checksum */

	status = acpi_tb_verify_checksum(table, length);
	if (ACPI_FAILURE(status)) {
		acpi_os_unmap_memory(table, length);
		return_ACPI_STATUS(status);
	}

	/* Get the number of entries and pointer to first entry */

	table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
			    table_entry_size);
	table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));

	/* Initialize the root table array from the RSDT/XSDT */

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

		/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */

		address =
		    acpi_tb_get_root_table_entry(table_entry, table_entry_size);

		/* Skip NULL entries in RSDT/XSDT */

		if (!address) {
			goto next_table;
		}

		status = acpi_tb_install_standard_table(address,
							ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
							FALSE, TRUE,
							&table_index);

		if (ACPI_SUCCESS(status) &&
		    ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
				      tables[table_index].signature,
				      ACPI_SIG_FADT)) {
			acpi_gbl_fadt_index = table_index;
			acpi_tb_parse_fadt();
		}

next_table:

		table_entry += table_entry_size;
	}

	acpi_os_unmap_memory(table, length);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_is_valid_signature
 *
 * PARAMETERS:  signature           - Sig string to be validated
 *
 * RETURN:      TRUE if signature is has 4 valid ACPI characters
 *
 * DESCRIPTION: Validate an ACPI table signature.
 *
 ******************************************************************************/

u8 acpi_is_valid_signature(char *signature)
{
	u32 i;

	/* Validate each character in the signature */

	for (i = 0; i < ACPI_NAME_SIZE; i++) {
		if (!acpi_ut_valid_acpi_char(signature[i], i)) {
			return (FALSE);
		}
	}

	return (TRUE);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
1da177e4 LT	2	*
42f47869	3	* Module Name: tbutils - ACPI Table utilities
1da177e4 LT	4	*
	5	*****************************************************************************/
	6
	7	/*
c8100dc4	8	* Copyright (C) 2000 - 2016, Intel Corp.
1da177e4 LT	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	44	#include <acpi/acpi.h>
e2f7a777 LB	45	#include "accommon.h"
e2f7a777 LB	46	#include "actables.h"
1da177e4	47
1da177e4	48	#define _COMPONENT ACPI_TABLES
4be44fcd	49	ACPI_MODULE_NAME("tbutils")
1da177e4	50
44f6c012	51	/* Local prototypes */
a4bbb810	52	static acpi_physical_address
67a119f9 BM	53	acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
67a119f9 BM	54
33620c54	55	#if (!ACPI_REDUCED_HARDWARE)
009c4cbe BM	56	/*******************************************************************************
	57	*
	58	* FUNCTION: acpi_tb_initialize_facs
	59	*
	60	* PARAMETERS: None
	61	*
	62	* RETURN: Status
	63	*
	64	* DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
	65	* for accessing the Global Lock and Firmware Waking Vector
	66	*
	67	******************************************************************************/
	68
	69	acpi_status acpi_tb_initialize_facs(void)
	70	{
7484619b	71	struct acpi_table_facs *facs;
009c4cbe	72
22e5b40a BM	73	/* If Hardware Reduced flag is set, there is no FACS */
	74
	75	if (acpi_gbl_reduced_hardware) {
	76	acpi_gbl_FACS = NULL;
	77	return (AE_OK);
8ec3f459 LZ	78	} else if (acpi_gbl_FADT.Xfacs &&
	79	(!acpi_gbl_FADT.facs
	80	\|\| !acpi_gbl_use32_bit_facs_addresses)) {
	81	(void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
	82	ACPI_CAST_INDIRECT_PTR(struct
	83	acpi_table_header,
7484619b LZ	84	&facs));
7484619b LZ	85	acpi_gbl_FACS = facs;
8ec3f459 LZ	86	} else if (acpi_gbl_FADT.facs) {
	87	(void)acpi_get_table_by_index(acpi_gbl_facs_index,
	88	ACPI_CAST_INDIRECT_PTR(struct
	89	acpi_table_header,
7484619b LZ	90	&facs));
7484619b LZ	91	acpi_gbl_FACS = facs;
c04e1fb4 LZ	92	}
c04e1fb4 LZ	93
f06147f9 LZ	94	/* If there is no FACS, just continue. There was already an error msg */
f06147f9 LZ	95
c04e1fb4	96	return (AE_OK);
009c4cbe	97	}
33620c54	98	#endif /* !ACPI_REDUCED_HARDWARE */
009c4cbe	99
729df0f8 LM	100	/*******************************************************************************
	101	*
	102	* FUNCTION: acpi_tb_check_dsdt_header
	103	*
	104	* PARAMETERS: None
	105	*
	106	* RETURN: None
	107	*
	108	* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
	109	* if the DSDT has been replaced from outside the OS and/or if
	110	* the DSDT header has been corrupted.
	111	*
	112	******************************************************************************/
	113
	114	void acpi_tb_check_dsdt_header(void)
	115	{
	116
	117	/* Compare original length and checksum to current values */
	118
43323cb4 BM	119	if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length \|\|
43323cb4 BM	120	acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
3b3ea775 BM	121	ACPI_BIOS_ERROR((AE_INFO,
	122	"The DSDT has been corrupted or replaced - "
	123	"old, new headers below"));
1fad8738	124
729df0f8	125	acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
43323cb4	126	acpi_tb_print_table_header(0, acpi_gbl_DSDT);
729df0f8	127
aa2110cb LM	128	ACPI_ERROR((AE_INFO,
	129	"Please send DMI info to linux-acpi@vger.kernel.org\n"
	130	"If system does not work as expected, please boot with acpi=copy_dsdt"));
	131
729df0f8 LM	132	/* Disable further error messages */
729df0f8 LM	133
43323cb4	134	acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
729df0f8	135	acpi_gbl_original_dsdt_header.checksum =
43323cb4	136	acpi_gbl_DSDT->checksum;
729df0f8 LM	137	}
	138	}
	139
69ec87ef LM	140	/*******************************************************************************
	141	*
	142	* FUNCTION: acpi_tb_copy_dsdt
	143	*
	144	* PARAMETERS: table_desc - Installed table to copy
	145	*
	146	* RETURN: None
	147	*
	148	* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
	149	* Some very bad BIOSs are known to either corrupt the DSDT or
	150	* install a new, bad DSDT. This copy works around the problem.
	151	*
	152	******************************************************************************/
	153
43323cb4	154	struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
69ec87ef LM	155	{
69ec87ef LM	156	struct acpi_table_header *new_table;
43323cb4 BM	157	struct acpi_table_desc *table_desc;
	158
	159	table_desc = &acpi_gbl_root_table_list.tables[table_index];
69ec87ef LM	160
	161	new_table = ACPI_ALLOCATE(table_desc->length);
	162	if (!new_table) {
	163	ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
	164	table_desc->length));
43323cb4	165	return (NULL);
69ec87ef LM	166	}
69ec87ef LM	167
4fa4616e	168	memcpy(new_table, table_desc->pointer, table_desc->length);
7f9fc99c	169	acpi_tb_uninstall_table(table_desc);
ed6f1d44 BM	170
ed6f1d44 BM	171	acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
8ec3f459	172	tables[acpi_gbl_dsdt_index],
ed6f1d44 BM	173	ACPI_PTR_TO_PHYSADDR(new_table),
	174	ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
	175	new_table);
69ec87ef LM	176
	177	ACPI_INFO((AE_INFO,
	178	"Forced DSDT copy: length 0x%05X copied locally, original unmapped",
	179	new_table->length));
43323cb4 BM	180
43323cb4 BM	181	return (new_table);
69ec87ef LM	182	}
69ec87ef LM	183
a4bbb810 BM	184	/*******************************************************************************
	185	*
	186	* FUNCTION: acpi_tb_get_root_table_entry
	187	*
	188	* PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
	189	* table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
	190	*
	191	* RETURN: Physical address extracted from the root table
	192	*
	193	* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
	194	* both 32-bit and 64-bit platforms
	195	*
	196	* NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
	197	* 64-bit platforms.
	198	*
	199	******************************************************************************/
	200
	201	static acpi_physical_address
67a119f9	202	acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
a4bbb810 BM	203	{
	204	u64 address64;
	205
	206	/*
	207	* Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
	208	* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
	209	*/
671cc68d	210	if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
a4bbb810 BM	211	/*
	212	* 32-bit platform, RSDT: Return 32-bit table entry
	213	* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
	214	*/
	215	return ((acpi_physical_address)
	216	(*ACPI_CAST_PTR(u32, table_entry)));
	217	} else {
	218	/*
	219	* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
ec41f193 BM	220	* 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
ec41f193 BM	221	* return 64-bit
a4bbb810 BM	222	*/
	223	ACPI_MOVE_64_TO_64(&address64, table_entry);
	224
	225	#if ACPI_MACHINE_WIDTH == 32
	226	if (address64 > ACPI_UINT32_MAX) {
	227
ea5d8ebc	228	/* Will truncate 64-bit address to 32 bits, issue warning */
a4bbb810	229
3b3ea775 BM	230	ACPI_BIOS_WARNING((AE_INFO,
	231	"64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
	232	" truncating",
	233	ACPI_FORMAT_UINT64(address64)));
a4bbb810 BM	234	}
	235	#endif
	236	return ((acpi_physical_address) (address64));
	237	}
	238	}
	239
793c2388 BM	240	/*******************************************************************************
793c2388 BM	241	*
f3d2e786	242	* FUNCTION: acpi_tb_parse_root_table
793c2388	243	*
ba494bee	244	* PARAMETERS: rsdp - Pointer to the RSDP
f3d2e786 BM	245	*
f3d2e786 BM	246	* RETURN: Status
793c2388	247	*
f3d2e786 BM	248	* DESCRIPTION: This function is called to parse the Root System Description
f3d2e786 BM	249	* Table (RSDT or XSDT)
793c2388	250	*
f3d2e786 BM	251	* NOTE: Tables are mapped (not copied) for efficiency. The FACS must
	252	* be mapped and cannot be copied because it contains the actual
	253	* memory location of the ACPI Global Lock.
793c2388 BM	254	*
	255	******************************************************************************/
	256
45c9f78b	257	acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
793c2388	258	{
c5fc42ac	259	struct acpi_table_rsdp *rsdp;
67a119f9 BM	260	u32 table_entry_size;
67a119f9 BM	261	u32 i;
c5fc42ac	262	u32 table_count;
f3d2e786 BM	263	struct acpi_table_header *table;
	264	acpi_physical_address address;
	265	u32 length;
	266	u8 *table_entry;
f3d2e786	267	acpi_status status;
86dfc6f3	268	u32 table_index;
f3d2e786 BM	269
	270	ACPI_FUNCTION_TRACE(tb_parse_root_table);
	271
671cc68d LZ	272	/* Map the entire RSDP and extract the address of the RSDT or XSDT */
671cc68d LZ	273
c5fc42ac BM	274	rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
	275	if (!rsdp) {
	276	return_ACPI_STATUS(AE_NO_MEMORY);
	277	}
	278
	279	acpi_tb_print_table_header(rsdp_address,
	280	ACPI_CAST_PTR(struct acpi_table_header,
	281	rsdp));
	282
fab46105	283	/* Use XSDT if present and not overridden. Otherwise, use RSDT */
f3d2e786	284
fab46105 LZ	285	if ((rsdp->revision > 1) &&
fab46105 LZ	286	rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
f3d2e786	287	/*
671cc68d LZ	288	* RSDP contains an XSDT (64-bit physical addresses). We must use
	289	* the XSDT if the revision is > 1 and the XSDT pointer is present,
	290	* as per the ACPI specification.
f3d2e786	291	*/
c5fc42ac	292	address = (acpi_physical_address) rsdp->xsdt_physical_address;
671cc68d	293	table_entry_size = ACPI_XSDT_ENTRY_SIZE;
f3d2e786 BM	294	} else {
	295	/* Root table is an RSDT (32-bit physical addresses) */
	296
c5fc42ac	297	address = (acpi_physical_address) rsdp->rsdt_physical_address;
671cc68d	298	table_entry_size = ACPI_RSDT_ENTRY_SIZE;
f3d2e786	299	}
793c2388	300
c5fc42ac BM	301	/*
	302	* It is not possible to map more than one entry in some environments,
	303	* so unmap the RSDP here before mapping other tables
	304	*/
	305	acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
	306
	307	/* Map the RSDT/XSDT table header to get the full table length */
793c2388	308
f3d2e786 BM	309	table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
f3d2e786 BM	310	if (!table) {
c5fc42ac	311	return_ACPI_STATUS(AE_NO_MEMORY);
f3d2e786 BM	312	}
f3d2e786 BM	313
c5fc42ac BM	314	acpi_tb_print_table_header(address, table);
c5fc42ac BM	315
671cc68d LZ	316	/*
	317	* Validate length of the table, and map entire table.
	318	* Minimum length table must contain at least one entry.
	319	*/
f3d2e786 BM	320	length = table->length;
	321	acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
	322
671cc68d	323	if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
3b3ea775 BM	324	ACPI_BIOS_ERROR((AE_INFO,
	325	"Invalid table length 0x%X in RSDT/XSDT",
	326	length));
c5fc42ac	327	return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
f3d2e786 BM	328	}
	329
	330	table = acpi_os_map_memory(address, length);
	331	if (!table) {
c5fc42ac	332	return_ACPI_STATUS(AE_NO_MEMORY);
f3d2e786 BM	333	}
	334
	335	/* Validate the root table checksum */
	336
c5fc42ac BM	337	status = acpi_tb_verify_checksum(table, length);
c5fc42ac BM	338	if (ACPI_FAILURE(status)) {
f3d2e786	339	acpi_os_unmap_memory(table, length);
c5fc42ac	340	return_ACPI_STATUS(status);
f3d2e786	341	}
f3d2e786	342
671cc68d	343	/* Get the number of entries and pointer to first entry */
f3d2e786	344
ec41f193 BM	345	table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
ec41f193 BM	346	table_entry_size);
671cc68d LZ	347	table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
671cc68d LZ	348
671cc68d LZ	349	/* Initialize the root table array from the RSDT/XSDT */
671cc68d LZ	350
c5fc42ac	351	for (i = 0; i < table_count; i++) {
f3d2e786	352
a4bbb810 BM	353	/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
a4bbb810 BM	354
0f929fbf LZ	355	address =
	356	acpi_tb_get_root_table_entry(table_entry, table_entry_size);
	357
	358	/* Skip NULL entries in RSDT/XSDT */
	359
	360	if (!address) {
	361	goto next_table;
	362	}
	363
	364	status = acpi_tb_install_standard_table(address,
	365	ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
	366	FALSE, TRUE,
	367	&table_index);
86dfc6f3 LZ	368
	369	if (ACPI_SUCCESS(status) &&
	370	ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
	371	tables[table_index].signature,
	372	ACPI_SIG_FADT)) {
62fcce91 LZ	373	acpi_gbl_fadt_index = table_index;
62fcce91 LZ	374	acpi_tb_parse_fadt();
86dfc6f3	375	}
f3d2e786	376
0f929fbf LZ	377	next_table:
0f929fbf LZ	378
c5fc42ac	379	table_entry += table_entry_size;
1da177e4	380	}
793c2388	381
f3d2e786	382	acpi_os_unmap_memory(table, length);
f3d2e786	383	return_ACPI_STATUS(AE_OK);
1da177e4	384	}
9f41fd8a BM	385
	386	/*******************************************************************************
	387	*
	388	* FUNCTION: acpi_is_valid_signature
	389	*
	390	* PARAMETERS: signature - Sig string to be validated
	391	*
395ec731	392	* RETURN: TRUE if signature is has 4 valid ACPI characters
9f41fd8a BM	393	*
	394	* DESCRIPTION: Validate an ACPI table signature.
	395	*
	396	******************************************************************************/
	397
	398	u8 acpi_is_valid_signature(char *signature)
	399	{
	400	u32 i;
	401
9f41fd8a BM	402	/* Validate each character in the signature */
	403
	404	for (i = 0; i < ACPI_NAME_SIZE; i++) {
	405	if (!acpi_ut_valid_acpi_char(signature[i], i)) {
	406	return (FALSE);
	407	}
	408	}
	409
	410	return (TRUE);
	411	}