[linux-2.6-block.git] / drivers / acpi / tables / tbrsdt.c

/******************************************************************************
 *
 * Module Name: tbrsdt - ACPI RSDT table utilities
 *
 *****************************************************************************/

/*
 * 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("tbrsdt")

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_verify_rsdp
 *
 * PARAMETERS:  Address         - RSDP (Pointer to RSDT)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
 *
 ******************************************************************************/
acpi_status acpi_tb_verify_rsdp(struct acpi_pointer *address)
{
	struct acpi_table_desc table_info;
	acpi_status status;
	struct rsdp_descriptor *rsdp;

	ACPI_FUNCTION_TRACE("tb_verify_rsdp");

	switch (address->pointer_type) {
	case ACPI_LOGICAL_POINTER:

		rsdp = address->pointer.logical;
		break;

	case ACPI_PHYSICAL_POINTER:
		/*
		 * Obtain access to the RSDP structure
		 */
		status = acpi_os_map_memory(address->pointer.physical,
					    sizeof(struct rsdp_descriptor),
					    (void *)&rsdp);
		if (ACPI_FAILURE(status)) {
			return_ACPI_STATUS(status);
		}
		break;

	default:
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Verify RSDP signature and checksum */

	status = acpi_tb_validate_rsdp(rsdp);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* The RSDP supplied is OK */

	table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp);
	table_info.length = sizeof(struct rsdp_descriptor);
	table_info.allocation = ACPI_MEM_MAPPED;

	/* Save the table pointers and allocation info */

	status = acpi_tb_init_table_descriptor(ACPI_TABLE_RSDP, &table_info);
	if (ACPI_FAILURE(status)) {
		goto cleanup;
	}

	/* Save the RSDP in a global for easy access */

	acpi_gbl_RSDP =
	    ACPI_CAST_PTR(struct rsdp_descriptor, table_info.pointer);
	return_ACPI_STATUS(status);

	/* Error exit */
      cleanup:

	if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
		acpi_os_unmap_memory(rsdp, sizeof(struct rsdp_descriptor));
	}
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_rsdt_address
 *
 * PARAMETERS:  out_address         - Where the address is returned
 *
 * RETURN:      None, Address
 *
 * DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the
 *              version of the RSDP and whether the XSDT pointer is valid
 *
 ******************************************************************************/

void acpi_tb_get_rsdt_address(struct acpi_pointer *out_address)
{

	ACPI_FUNCTION_ENTRY();

	out_address->pointer_type =
	    acpi_gbl_table_flags | ACPI_LOGICAL_ADDRESSING;

	/* Use XSDT if it is present */

	if ((acpi_gbl_RSDP->revision >= 2) &&
	    acpi_gbl_RSDP->xsdt_physical_address) {
		out_address->pointer.value =
		    acpi_gbl_RSDP->xsdt_physical_address;
		acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT;
	} else {
		/* No XSDT, use the RSDT */

		out_address->pointer.value =
		    acpi_gbl_RSDP->rsdt_physical_address;
		acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT;
	}
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_validate_rsdt
 *
 * PARAMETERS:  table_ptr       - Addressable pointer to the RSDT.
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Validate signature for the RSDT or XSDT
 *
 ******************************************************************************/

acpi_status acpi_tb_validate_rsdt(struct acpi_table_header *table_ptr)
{
	int no_match;

	ACPI_FUNCTION_NAME("tb_validate_rsdt");

	/*
	 * Search for appropriate signature, RSDT or XSDT
	 */
	if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
		no_match = ACPI_STRNCMP((char *)table_ptr, RSDT_SIG,
					sizeof(RSDT_SIG) - 1);
	} else {
		no_match = ACPI_STRNCMP((char *)table_ptr, XSDT_SIG,
					sizeof(XSDT_SIG) - 1);
	}

	if (no_match) {
		/* Invalid RSDT or XSDT signature */

		ACPI_REPORT_ERROR(("Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));

		ACPI_DUMP_BUFFER(acpi_gbl_RSDP, 20);

		ACPI_DEBUG_PRINT_RAW((ACPI_DB_ERROR,
				      "RSDT/XSDT signature at %X (%p) is invalid\n",
				      acpi_gbl_RSDP->rsdt_physical_address,
				      (void *)(acpi_native_uint) acpi_gbl_RSDP->
				      rsdt_physical_address));

		if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
			ACPI_REPORT_ERROR(("Looking for RSDT\n"))
		} else {
			ACPI_REPORT_ERROR(("Looking for XSDT\n"))
		}

		ACPI_DUMP_BUFFER((char *)table_ptr, 48);

		return (AE_BAD_SIGNATURE);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_tb_get_table_rsdt
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
 *
 ******************************************************************************/

acpi_status acpi_tb_get_table_rsdt(void)
{
	struct acpi_table_desc table_info;
	acpi_status status;
	struct acpi_pointer address;

	ACPI_FUNCTION_TRACE("tb_get_table_rsdt");

	/* Get the RSDT/XSDT via the RSDP */

	acpi_tb_get_rsdt_address(&address);

	table_info.type = ACPI_TABLE_XSDT;
	status = acpi_tb_get_table(&address, &table_info);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Could not get the RSDT/XSDT, %s\n",
				  acpi_format_exception(status)));

		return_ACPI_STATUS(status);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
			  acpi_gbl_RSDP,
			  ACPI_FORMAT_UINT64(address.pointer.value)));

	/* Check the RSDT or XSDT signature */

	status = acpi_tb_validate_rsdt(table_info.pointer);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Get the number of tables defined in the RSDT or XSDT */

	acpi_gbl_rsdt_table_count = acpi_tb_get_table_count(acpi_gbl_RSDP,
							    table_info.pointer);

	/* Convert and/or copy to an XSDT structure */

	status = acpi_tb_convert_to_xsdt(&table_info);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Save the table pointers and allocation info */

	status = acpi_tb_init_table_descriptor(ACPI_TABLE_XSDT, &table_info);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	acpi_gbl_XSDT = ACPI_CAST_PTR(XSDT_DESCRIPTOR, table_info.pointer);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
	return_ACPI_STATUS(status);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: tbrsdt - ACPI RSDT table utilities
	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("tbrsdt")
1da177e4 LT	49
	50	/*******************************************************************************
	51	*
	52	* FUNCTION: acpi_tb_verify_rsdp
	53	*
	54	* PARAMETERS: Address - RSDP (Pointer to RSDT)
	55	*
	56	* RETURN: Status
	57	*
	58	* DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
	59	*
	60	******************************************************************************/
4be44fcd	61	acpi_status acpi_tb_verify_rsdp(struct acpi_pointer *address)
1da177e4	62	{
4be44fcd LB	63	struct acpi_table_desc table_info;
	64	acpi_status status;
	65	struct rsdp_descriptor *rsdp;
1da177e4	66
4be44fcd	67	ACPI_FUNCTION_TRACE("tb_verify_rsdp");
1da177e4 LT	68
	69	switch (address->pointer_type) {
	70	case ACPI_LOGICAL_POINTER:
	71
	72	rsdp = address->pointer.logical;
	73	break;
	74
	75	case ACPI_PHYSICAL_POINTER:
	76	/*
	77	* Obtain access to the RSDP structure
	78	*/
4be44fcd LB	79	status = acpi_os_map_memory(address->pointer.physical,
	80	sizeof(struct rsdp_descriptor),
	81	(void *)&rsdp);
	82	if (ACPI_FAILURE(status)) {
	83	return_ACPI_STATUS(status);
1da177e4 LT	84	}
	85	break;
	86
	87	default:
4be44fcd	88	return_ACPI_STATUS(AE_BAD_PARAMETER);
1da177e4 LT	89	}
1da177e4 LT	90
f9f4601f	91	/* Verify RSDP signature and checksum */
1da177e4	92
4be44fcd LB	93	status = acpi_tb_validate_rsdp(rsdp);
4be44fcd LB	94	if (ACPI_FAILURE(status)) {
1da177e4 LT	95	goto cleanup;
	96	}
	97
1da177e4 LT	98	/* The RSDP supplied is OK */
1da177e4 LT	99
4be44fcd LB	100	table_info.pointer = ACPI_CAST_PTR(struct acpi_table_header, rsdp);
	101	table_info.length = sizeof(struct rsdp_descriptor);
	102	table_info.allocation = ACPI_MEM_MAPPED;
1da177e4 LT	103
	104	/* Save the table pointers and allocation info */
	105
4be44fcd LB	106	status = acpi_tb_init_table_descriptor(ACPI_TABLE_RSDP, &table_info);
4be44fcd LB	107	if (ACPI_FAILURE(status)) {
1da177e4 LT	108	goto cleanup;
	109	}
	110
	111	/* Save the RSDP in a global for easy access */
	112
4be44fcd LB	113	acpi_gbl_RSDP =
	114	ACPI_CAST_PTR(struct rsdp_descriptor, table_info.pointer);
	115	return_ACPI_STATUS(status);
1da177e4 LT	116
1da177e4 LT	117	/* Error exit */
4be44fcd	118	cleanup:
1da177e4 LT	119
1da177e4 LT	120	if (acpi_gbl_table_flags & ACPI_PHYSICAL_POINTER) {
4be44fcd	121	acpi_os_unmap_memory(rsdp, sizeof(struct rsdp_descriptor));
1da177e4	122	}
4be44fcd	123	return_ACPI_STATUS(status);
1da177e4 LT	124	}
1da177e4 LT	125
1da177e4 LT	126	/*******************************************************************************
	127	*
	128	* FUNCTION: acpi_tb_get_rsdt_address
	129	*
44f6c012	130	* PARAMETERS: out_address - Where the address is returned
1da177e4	131	*
44f6c012	132	* RETURN: None, Address
1da177e4	133	*
73459f73 RM	134	* DESCRIPTION: Extract the address of either the RSDT or XSDT, depending on the
73459f73 RM	135	* version of the RSDP and whether the XSDT pointer is valid
1da177e4 LT	136	*
	137	******************************************************************************/
	138
4be44fcd	139	void acpi_tb_get_rsdt_address(struct acpi_pointer *out_address)
1da177e4 LT	140	{
1da177e4 LT	141
4be44fcd	142	ACPI_FUNCTION_ENTRY();
1da177e4	143
4be44fcd LB	144	out_address->pointer_type =
4be44fcd LB	145	acpi_gbl_table_flags \| ACPI_LOGICAL_ADDRESSING;
1da177e4	146
73459f73 RM	147	/* Use XSDT if it is present */
	148
	149	if ((acpi_gbl_RSDP->revision >= 2) &&
4be44fcd	150	acpi_gbl_RSDP->xsdt_physical_address) {
44f6c012	151	out_address->pointer.value =
4be44fcd	152	acpi_gbl_RSDP->xsdt_physical_address;
73459f73	153	acpi_gbl_root_table_type = ACPI_TABLE_TYPE_XSDT;
4be44fcd	154	} else {
73459f73 RM	155	/* No XSDT, use the RSDT */
73459f73 RM	156
4be44fcd LB	157	out_address->pointer.value =
4be44fcd LB	158	acpi_gbl_RSDP->rsdt_physical_address;
73459f73	159	acpi_gbl_root_table_type = ACPI_TABLE_TYPE_RSDT;
1da177e4 LT	160	}
	161	}
	162
1da177e4 LT	163	/*******************************************************************************
	164	*
	165	* FUNCTION: acpi_tb_validate_rsdt
	166	*
	167	* PARAMETERS: table_ptr - Addressable pointer to the RSDT.
	168	*
	169	* RETURN: Status
	170	*
	171	* DESCRIPTION: Validate signature for the RSDT or XSDT
	172	*
	173	******************************************************************************/
	174
4be44fcd	175	acpi_status acpi_tb_validate_rsdt(struct acpi_table_header *table_ptr)
1da177e4	176	{
4be44fcd	177	int no_match;
1da177e4	178
4be44fcd	179	ACPI_FUNCTION_NAME("tb_validate_rsdt");
1da177e4 LT	180
1da177e4 LT	181	/*
73459f73	182	* Search for appropriate signature, RSDT or XSDT
1da177e4	183	*/
73459f73	184	if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
4be44fcd LB	185	no_match = ACPI_STRNCMP((char *)table_ptr, RSDT_SIG,
	186	sizeof(RSDT_SIG) - 1);
	187	} else {
	188	no_match = ACPI_STRNCMP((char *)table_ptr, XSDT_SIG,
	189	sizeof(XSDT_SIG) - 1);
1da177e4 LT	190	}
	191
	192	if (no_match) {
	193	/* Invalid RSDT or XSDT signature */
	194
4be44fcd	195	ACPI_REPORT_ERROR(("Invalid signature where RSDP indicates RSDT/XSDT should be located\n"));
1da177e4	196
4be44fcd	197	ACPI_DUMP_BUFFER(acpi_gbl_RSDP, 20);
1da177e4	198
4be44fcd LB	199	ACPI_DEBUG_PRINT_RAW((ACPI_DB_ERROR,
	200	"RSDT/XSDT signature at %X (%p) is invalid\n",
	201	acpi_gbl_RSDP->rsdt_physical_address,
	202	(void *)(acpi_native_uint) acpi_gbl_RSDP->
	203	rsdt_physical_address));
1da177e4	204
73459f73	205	if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
4be44fcd LB	206	ACPI_REPORT_ERROR(("Looking for RSDT\n"))
	207	} else {
	208	ACPI_REPORT_ERROR(("Looking for XSDT\n"))
1da177e4 LT	209	}
1da177e4 LT	210
4be44fcd	211	ACPI_DUMP_BUFFER((char *)table_ptr, 48);
1da177e4 LT	212
	213	return (AE_BAD_SIGNATURE);
	214	}
	215
	216	return (AE_OK);
	217	}
	218
1da177e4 LT	219	/*******************************************************************************
	220	*
	221	* FUNCTION: acpi_tb_get_table_rsdt
	222	*
	223	* PARAMETERS: None
	224	*
	225	* RETURN: Status
	226	*
	227	* DESCRIPTION: Load and validate the RSDP (ptr) and RSDT (table)
	228	*
	229	******************************************************************************/
	230
4be44fcd	231	acpi_status acpi_tb_get_table_rsdt(void)
1da177e4	232	{
4be44fcd LB	233	struct acpi_table_desc table_info;
	234	acpi_status status;
	235	struct acpi_pointer address;
1da177e4	236
4be44fcd	237	ACPI_FUNCTION_TRACE("tb_get_table_rsdt");
1da177e4 LT	238
	239	/* Get the RSDT/XSDT via the RSDP */
	240
4be44fcd	241	acpi_tb_get_rsdt_address(&address);
1da177e4 LT	242
1da177e4 LT	243	table_info.type = ACPI_TABLE_XSDT;
4be44fcd LB	244	status = acpi_tb_get_table(&address, &table_info);
	245	if (ACPI_FAILURE(status)) {
	246	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	247	"Could not get the RSDT/XSDT, %s\n",
	248	acpi_format_exception(status)));
44f6c012	249
4be44fcd	250	return_ACPI_STATUS(status);
1da177e4 LT	251	}
1da177e4 LT	252
4be44fcd LB	253	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	254	"RSDP located at %p, points to RSDT physical=%8.8X%8.8X \n",
	255	acpi_gbl_RSDP,
	256	ACPI_FORMAT_UINT64(address.pointer.value)));
1da177e4 LT	257
	258	/* Check the RSDT or XSDT signature */
	259
4be44fcd LB	260	status = acpi_tb_validate_rsdt(table_info.pointer);
	261	if (ACPI_FAILURE(status)) {
	262	return_ACPI_STATUS(status);
1da177e4 LT	263	}
	264
	265	/* Get the number of tables defined in the RSDT or XSDT */
	266
4be44fcd LB	267	acpi_gbl_rsdt_table_count = acpi_tb_get_table_count(acpi_gbl_RSDP,
4be44fcd LB	268	table_info.pointer);
1da177e4 LT	269
	270	/* Convert and/or copy to an XSDT structure */
	271
4be44fcd LB	272	status = acpi_tb_convert_to_xsdt(&table_info);
	273	if (ACPI_FAILURE(status)) {
	274	return_ACPI_STATUS(status);
1da177e4 LT	275	}
	276
	277	/* Save the table pointers and allocation info */
	278
4be44fcd LB	279	status = acpi_tb_init_table_descriptor(ACPI_TABLE_XSDT, &table_info);
	280	if (ACPI_FAILURE(status)) {
	281	return_ACPI_STATUS(status);
1da177e4 LT	282	}
1da177e4 LT	283
4be44fcd	284	acpi_gbl_XSDT = ACPI_CAST_PTR(XSDT_DESCRIPTOR, table_info.pointer);
1da177e4	285
4be44fcd LB	286	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "XSDT located at %p\n", acpi_gbl_XSDT));
4be44fcd LB	287	return_ACPI_STATUS(status);
1da177e4	288	}