Subversion Repositories or1k

/******************************************************************************

 *

 * Module Name: tbrsdt - ACPI RSDT table utilities

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2004, 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);

        }

        /*

         *  The signature and checksum must both be correct

         */

        if (ACPI_STRNCMP ((char *) rsdp, RSDP_SIG, sizeof (RSDP_SIG)-1) != 0) {

                /* Nope, BAD Signature */

                status = AE_BAD_SIGNATURE;

                goto cleanup;

        }

        /* Check the standard checksum */

        if (acpi_tb_checksum (rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {

                status = AE_BAD_CHECKSUM;

                goto cleanup;

        }

        /* Check extended checksum if table version >= 2 */

        if (rsdp->revision >= 2) {

                if (acpi_tb_checksum (rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) {

                        status = AE_BAD_CHECKSUM;

                        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:  None

 *

 * RETURN:      RSDT physical address

 *

 * DESCRIPTION: Extract the address of the RSDT or XSDT, depending on the

 *              version of the RSDP

 *

 ******************************************************************************/

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;

        /*

         * For RSDP revision 0 or 1, we use the RSDT.

         * For RSDP revision 2 (and above), we use the XSDT

         */

        if (acpi_gbl_RSDP->revision < 2) {

                out_address->pointer.value = acpi_gbl_RSDP->rsdt_physical_address;

        }

        else {

                out_address->pointer.value = acpi_gbl_RSDP->xsdt_physical_address;

        }

}

/*******************************************************************************

 *

 * 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");

        /*

         * For RSDP revision 0 or 1, we use the RSDT.

         * For RSDP revision 2 and above, we use the XSDT

         */

        if (acpi_gbl_RSDP->revision < 2) {

                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_RSDP->revision < 2) {

                        ACPI_REPORT_ERROR (("Looking for RSDT (RSDP->Rev < 2)\n"))

                }

                else {

                        ACPI_REPORT_ERROR (("Looking for XSDT (RSDP->Rev >= 2)\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);

        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);

}