Linux 2.6.17.7

[linux/fpc-iii.git] / drivers / acpi / utilities / utresrc.c

/*******************************************************************************
 *
 * Module Name: utresrc - Resource managment utilities
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2006, 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/amlresrc.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utmisc")

#if defined(ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
/*
 * Strings used to decode resource descriptors.
 * Used by both the disasssembler and the debugger resource dump routines
 */
const char *acpi_gbl_BMdecode[2] = {
        "not_bus_master",
        "bus_master"
};

const char *acpi_gbl_config_decode[4] = {
        "0 - Good Configuration",
        "1 - Acceptable Configuration",
        "2 - Suboptimal Configuration",
        "3 - ***Invalid Configuration***",
};

const char *acpi_gbl_consume_decode[2] = {
        "resource_producer",
        "resource_consumer"
};

const char *acpi_gbl_DECdecode[2] = {
        "pos_decode",
        "sub_decode"
};

const char *acpi_gbl_HEdecode[2] = {
        "Level",
        "Edge"
};

const char *acpi_gbl_io_decode[2] = {
        "Decode10",
        "Decode16"
};

const char *acpi_gbl_LLdecode[2] = {
        "active_high",
        "active_low"
};

const char *acpi_gbl_max_decode[2] = {
        "max_not_fixed",
        "max_fixed"
};

const char *acpi_gbl_MEMdecode[4] = {
        "non_cacheable",
        "Cacheable",
        "write_combining",
        "Prefetchable"
};

const char *acpi_gbl_min_decode[2] = {
        "min_not_fixed",
        "min_fixed"
};

const char *acpi_gbl_MTPdecode[4] = {
        "address_range_memory",
        "address_range_reserved",
        "address_range_aCPI",
        "address_range_nVS"
};

const char *acpi_gbl_RNGdecode[4] = {
        "invalid_ranges",
        "non_iSAonly_ranges",
        "ISAonly_ranges",
        "entire_range"
};

const char *acpi_gbl_RWdecode[2] = {
        "read_only",
        "read_write"
};

const char *acpi_gbl_SHRdecode[2] = {
        "Exclusive",
        "Shared"
};

const char *acpi_gbl_SIZdecode[4] = {
        "Transfer8",
        "Transfer8_16",
        "Transfer16",
        "invalid_size"
};

const char *acpi_gbl_TRSdecode[2] = {
        "dense_translation",
        "sparse_translation"
};

const char *acpi_gbl_TTPdecode[2] = {
        "type_static",
        "type_translation"
};

const char *acpi_gbl_TYPdecode[4] = {
        "Compatibility",
        "type_a",
        "type_b",
        "type_f"
};

#endif

/*
 * Base sizes of the raw AML resource descriptors, indexed by resource type.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
const u8 acpi_gbl_resource_aml_sizes[] = {
        /* Small descriptors */

        0,
        0,
        0,
        0,
        ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
        ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
        ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
        ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
        ACPI_AML_SIZE_SMALL(struct aml_resource_io),
        ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
        0,
        0,
        0,
        0,
        ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
        ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),

        /* Large descriptors */

        0,
        ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
        ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
        0,
        ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
        ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
        ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
        ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
        ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
        ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
        ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
        ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64)
};

/*
 * Resource types, used to validate the resource length field.
 * The length of fixed-length types must match exactly, variable
 * lengths must meet the minimum required length, etc.
 * Zero indicates a reserved (and therefore invalid) resource type.
 */
static const u8 acpi_gbl_resource_types[] = {
        /* Small descriptors */

        0,
        0,
        0,
        0,
        ACPI_SMALL_VARIABLE_LENGTH,
        ACPI_FIXED_LENGTH,
        ACPI_SMALL_VARIABLE_LENGTH,
        ACPI_FIXED_LENGTH,
        ACPI_FIXED_LENGTH,
        ACPI_FIXED_LENGTH,
        0,
        0,
        0,
        0,
        ACPI_VARIABLE_LENGTH,
        ACPI_FIXED_LENGTH,

        /* Large descriptors */

        0,
        ACPI_FIXED_LENGTH,
        ACPI_FIXED_LENGTH,
        0,
        ACPI_VARIABLE_LENGTH,
        ACPI_FIXED_LENGTH,
        ACPI_FIXED_LENGTH,
        ACPI_VARIABLE_LENGTH,
        ACPI_VARIABLE_LENGTH,
        ACPI_VARIABLE_LENGTH,
        ACPI_VARIABLE_LENGTH,
        ACPI_FIXED_LENGTH
};

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_validate_resource
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *              return_index    - Where the resource index is returned. NULL
 *                                if the index is not required.
 *
 * RETURN:      Status, and optionally the Index into the global resource tables
 *
 * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
 *              Type and Resource Length. Returns an index into the global
 *              resource information/dispatch tables for later use.
 *
 ******************************************************************************/

acpi_status acpi_ut_validate_resource(void *aml, u8 * return_index)
{
        u8 resource_type;
        u8 resource_index;
        acpi_rs_length resource_length;
        acpi_rs_length minimum_resource_length;

        ACPI_FUNCTION_ENTRY();

        /*
         * 1) Validate the resource_type field (Byte 0)
         */
        resource_type = ACPI_GET8(aml);

        /*
         * Byte 0 contains the descriptor name (Resource Type)
         * Examine the large/small bit in the resource header
         */
        if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
                /* Verify the large resource type (name) against the max */

                if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
                        return (AE_AML_INVALID_RESOURCE_TYPE);
                }

                /*
                 * Large Resource Type -- bits 6:0 contain the name
                 * Translate range 0x80-0x8B to index range 0x10-0x1B
                 */
                resource_index = (u8) (resource_type - 0x70);
        } else {
                /*
                 * Small Resource Type -- bits 6:3 contain the name
                 * Shift range to index range 0x00-0x0F
                 */
                resource_index = (u8)
                    ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
        }

        /* Check validity of the resource type, zero indicates name is invalid */

        if (!acpi_gbl_resource_types[resource_index]) {
                return (AE_AML_INVALID_RESOURCE_TYPE);
        }

        /*
         * 2) Validate the resource_length field. This ensures that the length
         *    is at least reasonable, and guarantees that it is non-zero.
         */
        resource_length = acpi_ut_get_resource_length(aml);
        minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];

        /* Validate based upon the type of resource - fixed length or variable */

        switch (acpi_gbl_resource_types[resource_index]) {
        case ACPI_FIXED_LENGTH:

                /* Fixed length resource, length must match exactly */

                if (resource_length != minimum_resource_length) {
                        return (AE_AML_BAD_RESOURCE_LENGTH);
                }
                break;

        case ACPI_VARIABLE_LENGTH:

                /* Variable length resource, length must be at least the minimum */

                if (resource_length < minimum_resource_length) {
                        return (AE_AML_BAD_RESOURCE_LENGTH);
                }
                break;

        case ACPI_SMALL_VARIABLE_LENGTH:

                /* Small variable length resource, length can be (Min) or (Min-1) */

                if ((resource_length > minimum_resource_length) ||
                    (resource_length < (minimum_resource_length - 1))) {
                        return (AE_AML_BAD_RESOURCE_LENGTH);
                }
                break;

        default:

                /* Shouldn't happen (because of validation earlier), but be sure */

                return (AE_AML_INVALID_RESOURCE_TYPE);
        }

        /* Optionally return the resource table index */

        if (return_index) {
                *return_index = resource_index;
        }

        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_type
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      The Resource Type with no extraneous bits (except the
 *              Large/Small descriptor bit -- this is left alone)
 *
 * DESCRIPTION: Extract the Resource Type/Name from the first byte of
 *              a resource descriptor.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_type(void *aml)
{
        ACPI_FUNCTION_ENTRY();

        /*
         * Byte 0 contains the descriptor name (Resource Type)
         * Examine the large/small bit in the resource header
         */
        if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
                /* Large Resource Type -- bits 6:0 contain the name */

                return (ACPI_GET8(aml));
        } else {
                /* Small Resource Type -- bits 6:3 contain the name */

                return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte Length
 *
 * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
 *              definition, this does not include the size of the descriptor
 *              header or the length field itself.
 *
 ******************************************************************************/

u16 acpi_ut_get_resource_length(void *aml)
{
        acpi_rs_length resource_length;

        ACPI_FUNCTION_ENTRY();

        /*
         * Byte 0 contains the descriptor name (Resource Type)
         * Examine the large/small bit in the resource header
         */
        if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
                /* Large Resource type -- bytes 1-2 contain the 16-bit length */

                ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));

        } else {
                /* Small Resource type -- bits 2:0 of byte 0 contain the length */

                resource_length = (u16) (ACPI_GET8(aml) &
                                         ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
        }

        return (resource_length);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_header_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Length of the AML header (depends on large/small descriptor)
 *
 * DESCRIPTION: Get the length of the header for this resource.
 *
 ******************************************************************************/

u8 acpi_ut_get_resource_header_length(void *aml)
{
        ACPI_FUNCTION_ENTRY();

        /* Examine the large/small bit in the resource header */

        if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
                return (sizeof(struct aml_resource_large_header));
        } else {
                return (sizeof(struct aml_resource_small_header));
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_descriptor_length
 *
 * PARAMETERS:  Aml             - Pointer to the raw AML resource descriptor
 *
 * RETURN:      Byte length
 *
 * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
 *              length of the descriptor header and the length field itself.
 *              Used to walk descriptor lists.
 *
 ******************************************************************************/

u32 acpi_ut_get_descriptor_length(void *aml)
{
        ACPI_FUNCTION_ENTRY();

        /*
         * Get the Resource Length (does not include header length) and add
         * the header length (depends on if this is a small or large resource)
         */
        return (acpi_ut_get_resource_length(aml) +
                acpi_ut_get_resource_header_length(aml));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_get_resource_end_tag
 *
 * PARAMETERS:  obj_desc        - The resource template buffer object
 *              end_tag         - Where the pointer to the end_tag is returned
 *
 * RETURN:      Status, pointer to the end tag
 *
 * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
 *              Note: allows a buffer length of zero.
 *
 ******************************************************************************/

acpi_status
acpi_ut_get_resource_end_tag(union acpi_operand_object * obj_desc,
                             u8 ** end_tag)
{
        acpi_status status;
        u8 *aml;
        u8 *end_aml;

        ACPI_FUNCTION_TRACE("ut_get_resource_end_tag");

        /* Get start and end pointers */

        aml = obj_desc->buffer.pointer;
        end_aml = aml + obj_desc->buffer.length;

        /* Allow a buffer length of zero */

        if (!obj_desc->buffer.length) {
                *end_tag = aml;
                return_ACPI_STATUS(AE_OK);
        }

        /* Walk the resource template, one descriptor per iteration */

        while (aml < end_aml) {
                /* Validate the Resource Type and Resource Length */

                status = acpi_ut_validate_resource(aml, NULL);
                if (ACPI_FAILURE(status)) {
                        return_ACPI_STATUS(status);
                }

                /* end_tag resource indicates the end of the resource template */

                if (acpi_ut_get_resource_type(aml) ==
                    ACPI_RESOURCE_NAME_END_TAG) {
                        /*
                         * There must be at least one more byte in the buffer for
                         * the 2nd byte of the end_tag
                         */
                        if ((aml + 1) >= end_aml) {
                                return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
                        }

                        /* Return the pointer to the end_tag */

                        *end_tag = aml;
                        return_ACPI_STATUS(AE_OK);
                }

                /*
                 * Point to the next resource descriptor in the AML buffer. The
                 * descriptor length is guaranteed to be non-zero by resource
                 * validation above.
                 */
                aml += acpi_ut_get_descriptor_length(aml);
        }

        /* Did not find an end_tag resource descriptor */

        return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
}