exoparg3.c

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/******************************************************************************
 *
 * Module Name: exoparg3 - AML execution - opcodes with 3 arguments
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2012, 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 "acinterp.h"
#include "acparser.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg3")


/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_3A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Triadic operator (3 operands)
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_3A_0T_0R(struct acpi_walk_state *walk_state)
{
    union acpi_operand_object **operand = &walk_state->operands[0];
    struct acpi_signal_fatal_info *fatal;
    acpi_status status = AE_OK;

    ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_0T_0R,
                acpi_ps_get_opcode_name(walk_state->opcode));

    switch (walk_state->opcode) {
    case AML_FATAL_OP:  /* Fatal (fatal_type fatal_code fatal_arg) */

        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                  "FatalOp: Type %X Code %X Arg %X <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n",
                  (u32) operand[0]->integer.value,
                  (u32) operand[1]->integer.value,
                  (u32) operand[2]->integer.value));

        fatal = ACPI_ALLOCATE(sizeof(struct acpi_signal_fatal_info));
        if (fatal) {
            fatal->type = (u32) operand[0]->integer.value;
            fatal->code = (u32) operand[1]->integer.value;
            fatal->argument = (u32) operand[2]->integer.value;
        }

        /* Always signal the OS! */

        status = acpi_os_signal(ACPI_SIGNAL_FATAL, fatal);

        /* Might return while OS is shutting down, just continue */

        ACPI_FREE(fatal);
        break;

    default:

        ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
                walk_state->opcode));
        status = AE_AML_BAD_OPCODE;
        goto cleanup;
    }

      cleanup:

    return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_3A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute Triadic operator (3 operands)
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_3A_1T_1R(struct acpi_walk_state *walk_state)
{
    union acpi_operand_object **operand = &walk_state->operands[0];
    union acpi_operand_object *return_desc = NULL;
    char *buffer = NULL;
    acpi_status status = AE_OK;
    u64 index;
    acpi_size length;

    ACPI_FUNCTION_TRACE_STR(ex_opcode_3A_1T_1R,
                acpi_ps_get_opcode_name(walk_state->opcode));

    switch (walk_state->opcode) {
    case AML_MID_OP:    /* Mid (Source[0], Index[1], Length[2], Result[3]) */

        /*
         * Create the return object.  The Source operand is guaranteed to be
         * either a String or a Buffer, so just use its type.
         */
        return_desc = acpi_ut_create_internal_object((operand[0])->
                                 common.type);
        if (!return_desc) {
            status = AE_NO_MEMORY;
            goto cleanup;
        }

        /* Get the Integer values from the objects */

        index = operand[1]->integer.value;
        length = (acpi_size) operand[2]->integer.value;

        /*
         * If the index is beyond the length of the String/Buffer, or if the
         * requested length is zero, return a zero-length String/Buffer
         */
        if (index >= operand[0]->string.length) {
            length = 0;
        }

        /* Truncate request if larger than the actual String/Buffer */

        else if ((index + length) > operand[0]->string.length) {
            length = (acpi_size) operand[0]->string.length -
                (acpi_size) index;
        }

        /* Strings always have a sub-pointer, not so for buffers */

        switch ((operand[0])->common.type) {
        case ACPI_TYPE_STRING:

            /* Always allocate a new buffer for the String */

            buffer = ACPI_ALLOCATE_ZEROED((acpi_size) length + 1);
            if (!buffer) {
                status = AE_NO_MEMORY;
                goto cleanup;
            }
            break;

        case ACPI_TYPE_BUFFER:

            /* If the requested length is zero, don't allocate a buffer */

            if (length > 0) {

                /* Allocate a new buffer for the Buffer */

                buffer = ACPI_ALLOCATE_ZEROED(length);
                if (!buffer) {
                    status = AE_NO_MEMORY;
                    goto cleanup;
                }
            }
            break;

        default:    /* Should not happen */

            status = AE_AML_OPERAND_TYPE;
            goto cleanup;
        }

        if (buffer) {

            /* We have a buffer, copy the portion requested */

            ACPI_MEMCPY(buffer, operand[0]->string.pointer + index,
                    length);
        }

        /* Set the length of the new String/Buffer */

        return_desc->string.pointer = buffer;
        return_desc->string.length = (u32) length;

        /* Mark buffer initialized */

        return_desc->buffer.flags |= AOPOBJ_DATA_VALID;
        break;

    default:

        ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
                walk_state->opcode));
        status = AE_AML_BAD_OPCODE;
        goto cleanup;
    }

    /* Store the result in the target */

    status = acpi_ex_store(return_desc, operand[3], walk_state);

      cleanup:

    /* Delete return object on error */

    if (ACPI_FAILURE(status) || walk_state->result_obj) {
        acpi_ut_remove_reference(return_desc);
        walk_state->result_obj = NULL;
    }

    /* Set the return object and exit */

    else {
        walk_state->result_obj = return_desc;
    }
    return_ACPI_STATUS(status);
}