Merge branch 'akpm'

[linux-2.6/next.git] / drivers / acpi / acpica / exoparg2.c

/******************************************************************************
 *
 * Module Name: exoparg2 - AML execution - opcodes with 2 arguments
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2011, 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 "acparser.h"
#include "acinterp.h"
#include "acevents.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exoparg2")

/*!
 * Naming convention for AML interpreter execution routines.
 *
 * The routines that begin execution of AML opcodes are named with a common
 * convention based upon the number of arguments, the number of target operands,
 * and whether or not a value is returned:
 *
 *      AcpiExOpcode_xA_yT_zR
 *
 * Where:
 *
 * xA - ARGUMENTS:    The number of arguments (input operands) that are
 *                    required for this opcode type (1 through 6 args).
 * yT - TARGETS:      The number of targets (output operands) that are required
 *                    for this opcode type (0, 1, or 2 targets).
 * zR - RETURN VALUE: Indicates whether this opcode type returns a value
 *                    as the function return (0 or 1).
 *
 * The AcpiExOpcode* functions are called via the Dispatcher component with
 * fully resolved operands.
!*/
/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_0T_0R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with two arguments, no target, and no return
 *              value.
 *
 * ALLOCATION:  Deletes both operands
 *
 ******************************************************************************/
acpi_status acpi_ex_opcode_2A_0T_0R(struct acpi_walk_state *walk_state)
{
        union acpi_operand_object **operand = &walk_state->operands[0];
        struct acpi_namespace_node *node;
        u32 value;
        acpi_status status = AE_OK;

        ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_0R,
                                acpi_ps_get_opcode_name(walk_state->opcode));

        /* Examine the opcode */

        switch (walk_state->opcode) {
        case AML_NOTIFY_OP:     /* Notify (notify_object, notify_value) */

                /* The first operand is a namespace node */

                node = (struct acpi_namespace_node *)operand[0];

                /* Second value is the notify value */

                value = (u32) operand[1]->integer.value;

                /* Are notifies allowed on this object? */

                if (!acpi_ev_is_notify_object(node)) {
                        ACPI_ERROR((AE_INFO,
                                    "Unexpected notify object type [%s]",
                                    acpi_ut_get_type_name(node->type)));

                        status = AE_AML_OPERAND_TYPE;
                        break;
                }

                /*
                 * Dispatch the notify to the appropriate handler
                 * NOTE: the request is queued for execution after this method
                 * completes.  The notify handlers are NOT invoked synchronously
                 * from this thread -- because handlers may in turn run other
                 * control methods.
                 */
                status = acpi_ev_queue_notify_request(node, value);
                break;

        default:

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

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_2T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute a dyadic operator (2 operands) with 2 output targets
 *              and one implicit return value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_2T_1R(struct acpi_walk_state *walk_state)
{
        union acpi_operand_object **operand = &walk_state->operands[0];
        union acpi_operand_object *return_desc1 = NULL;
        union acpi_operand_object *return_desc2 = NULL;
        acpi_status status;

        ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_2T_1R,
                                acpi_ps_get_opcode_name(walk_state->opcode));

        /* Execute the opcode */

        switch (walk_state->opcode) {
        case AML_DIVIDE_OP:

                /* Divide (Dividend, Divisor, remainder_result quotient_result) */

                return_desc1 =
                    acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
                if (!return_desc1) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                return_desc2 =
                    acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
                if (!return_desc2) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                /* Quotient to return_desc1, remainder to return_desc2 */

                status = acpi_ut_divide(operand[0]->integer.value,
                                        operand[1]->integer.value,
                                        &return_desc1->integer.value,
                                        &return_desc2->integer.value);
                if (ACPI_FAILURE(status)) {
                        goto cleanup;
                }
                break;

        default:

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

        /* Store the results to the target reference operands */

        status = acpi_ex_store(return_desc2, operand[2], walk_state);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

        status = acpi_ex_store(return_desc1, operand[3], walk_state);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

      cleanup:
        /*
         * Since the remainder is not returned indirectly, remove a reference to
         * it. Only the quotient is returned indirectly.
         */
        acpi_ut_remove_reference(return_desc2);

        if (ACPI_FAILURE(status)) {

                /* Delete the return object */

                acpi_ut_remove_reference(return_desc1);
        }

        /* Save return object (the remainder) on success */

        else {
                walk_state->result_obj = return_desc1;
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_1T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with two arguments, one target, and a return
 *              value.
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
{
        union acpi_operand_object **operand = &walk_state->operands[0];
        union acpi_operand_object *return_desc = NULL;
        u64 index;
        acpi_status status = AE_OK;
        acpi_size length;

        ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_1T_1R,
                                acpi_ps_get_opcode_name(walk_state->opcode));

        /* Execute the opcode */

        if (walk_state->op_info->flags & AML_MATH) {

                /* All simple math opcodes (add, etc.) */

                return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
                if (!return_desc) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                return_desc->integer.value =
                    acpi_ex_do_math_op(walk_state->opcode,
                                       operand[0]->integer.value,
                                       operand[1]->integer.value);
                goto store_result_to_target;
        }

        switch (walk_state->opcode) {
        case AML_MOD_OP:        /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */

                return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
                if (!return_desc) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                /* return_desc will contain the remainder */

                status = acpi_ut_divide(operand[0]->integer.value,
                                        operand[1]->integer.value,
                                        NULL, &return_desc->integer.value);
                break;

        case AML_CONCAT_OP:     /* Concatenate (Data1, Data2, Result) */

                status = acpi_ex_do_concatenate(operand[0], operand[1],
                                                &return_desc, walk_state);
                break;

        case AML_TO_STRING_OP:  /* to_string (Buffer, Length, Result) (ACPI 2.0) */

                /*
                 * Input object is guaranteed to be a buffer at this point (it may have
                 * been converted.)  Copy the raw buffer data to a new object of
                 * type String.
                 */

                /*
                 * Get the length of the new string. It is the smallest of:
                 * 1) Length of the input buffer
                 * 2) Max length as specified in the to_string operator
                 * 3) Length of input buffer up to a zero byte (null terminator)
                 *
                 * NOTE: A length of zero is ok, and will create a zero-length, null
                 *       terminated string.
                 */
                length = 0;
                while ((length < operand[0]->buffer.length) &&
                       (length < operand[1]->integer.value) &&
                       (operand[0]->buffer.pointer[length])) {
                        length++;
                }

                /* Allocate a new string object */

                return_desc = acpi_ut_create_string_object(length);
                if (!return_desc) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                /*
                 * Copy the raw buffer data with no transform.
                 * (NULL terminated already)
                 */
                ACPI_MEMCPY(return_desc->string.pointer,
                            operand[0]->buffer.pointer, length);
                break;

        case AML_CONCAT_RES_OP:

                /* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */

                status = acpi_ex_concat_template(operand[0], operand[1],
                                                 &return_desc, walk_state);
                break;

        case AML_INDEX_OP:      /* Index (Source Index Result) */

                /* Create the internal return object */

                return_desc =
                    acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
                if (!return_desc) {
                        status = AE_NO_MEMORY;
                        goto cleanup;
                }

                /* Initialize the Index reference object */

                index = operand[1]->integer.value;
                return_desc->reference.value = (u32) index;
                return_desc->reference.class = ACPI_REFCLASS_INDEX;

                /*
                 * At this point, the Source operand is a String, Buffer, or Package.
                 * Verify that the index is within range.
                 */
                switch ((operand[0])->common.type) {
                case ACPI_TYPE_STRING:

                        if (index >= operand[0]->string.length) {
                                status = AE_AML_STRING_LIMIT;
                        }

                        return_desc->reference.target_type =
                            ACPI_TYPE_BUFFER_FIELD;
                        break;

                case ACPI_TYPE_BUFFER:

                        if (index >= operand[0]->buffer.length) {
                                status = AE_AML_BUFFER_LIMIT;
                        }

                        return_desc->reference.target_type =
                            ACPI_TYPE_BUFFER_FIELD;
                        break;

                case ACPI_TYPE_PACKAGE:

                        if (index >= operand[0]->package.count) {
                                status = AE_AML_PACKAGE_LIMIT;
                        }

                        return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
                        return_desc->reference.where =
                            &operand[0]->package.elements[index];
                        break;

                default:

                        status = AE_AML_INTERNAL;
                        goto cleanup;
                }

                /* Failure means that the Index was beyond the end of the object */

                if (ACPI_FAILURE(status)) {
                        ACPI_EXCEPTION((AE_INFO, status,
                                        "Index (0x%8.8X%8.8X) is beyond end of object",
                                        ACPI_FORMAT_UINT64(index)));
                        goto cleanup;
                }

                /*
                 * Save the target object and add a reference to it for the life
                 * of the index
                 */
                return_desc->reference.object = operand[0];
                acpi_ut_add_reference(operand[0]);

                /* Store the reference to the Target */

                status = acpi_ex_store(return_desc, operand[2], walk_state);

                /* Return the reference */

                walk_state->result_obj = return_desc;
                goto cleanup;

        default:

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

      store_result_to_target:

        if (ACPI_SUCCESS(status)) {
                /*
                 * Store the result of the operation (which is now in return_desc) into
                 * the Target descriptor.
                 */
                status = acpi_ex_store(return_desc, operand[2], walk_state);
                if (ACPI_FAILURE(status)) {
                        goto cleanup;
                }

                if (!walk_state->result_obj) {
                        walk_state->result_obj = return_desc;
                }
        }

      cleanup:

        /* Delete return object on error */

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

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_opcode_2A_0T_1R
 *
 * PARAMETERS:  walk_state          - Current walk state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Execute opcode with 2 arguments, no target, and a return value
 *
 ******************************************************************************/

acpi_status acpi_ex_opcode_2A_0T_1R(struct acpi_walk_state *walk_state)
{
        union acpi_operand_object **operand = &walk_state->operands[0];
        union acpi_operand_object *return_desc = NULL;
        acpi_status status = AE_OK;
        u8 logical_result = FALSE;

        ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_0T_1R,
                                acpi_ps_get_opcode_name(walk_state->opcode));

        /* Create the internal return object */

        return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
        if (!return_desc) {
                status = AE_NO_MEMORY;
                goto cleanup;
        }

        /* Execute the Opcode */

        if (walk_state->op_info->flags & AML_LOGICAL_NUMERIC) {

                /* logical_op (Operand0, Operand1) */

                status = acpi_ex_do_logical_numeric_op(walk_state->opcode,
                                                       operand[0]->integer.
                                                       value,
                                                       operand[1]->integer.
                                                       value, &logical_result);
                goto store_logical_result;
        } else if (walk_state->op_info->flags & AML_LOGICAL) {

                /* logical_op (Operand0, Operand1) */

                status = acpi_ex_do_logical_op(walk_state->opcode, operand[0],
                                               operand[1], &logical_result);
                goto store_logical_result;
        }

        switch (walk_state->opcode) {
        case AML_ACQUIRE_OP:    /* Acquire (mutex_object, Timeout) */

                status =
                    acpi_ex_acquire_mutex(operand[1], operand[0], walk_state);
                if (status == AE_TIME) {
                        logical_result = TRUE;  /* TRUE = Acquire timed out */
                        status = AE_OK;
                }
                break;

        case AML_WAIT_OP:       /* Wait (event_object, Timeout) */

                status = acpi_ex_system_wait_event(operand[1], operand[0]);
                if (status == AE_TIME) {
                        logical_result = TRUE;  /* TRUE, Wait timed out */
                        status = AE_OK;
                }
                break;

        default:

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

      store_logical_result:
        /*
         * Set return value to according to logical_result. logical TRUE (all ones)
         * Default is FALSE (zero)
         */
        if (logical_result) {
                return_desc->integer.value = ACPI_UINT64_MAX;
        }

      cleanup:

        /* Delete return object on error */

        if (ACPI_FAILURE(status)) {
                acpi_ut_remove_reference(return_desc);
        }

        /* Save return object on success */

        else {
                walk_state->result_obj = return_desc;
        }

        return_ACPI_STATUS(status);
}