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

 *

 * Module Name: exutils - interpreter/scanner utilities

 *

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

/*

 * Copyright (C) 2000 - 2007, 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.

 */

/*

 * DEFINE_AML_GLOBALS is tested in amlcode.h

 * to determine whether certain global names should be "defined" or only

 * "declared" in the current compilation.  This enhances maintainability

 * by enabling a single header file to embody all knowledge of the names

 * in question.

 *

 * Exactly one module of any executable should #define DEFINE_GLOBALS

 * before #including the header files which use this convention.  The

 * names in question will be defined and initialized in that module,

 * and declared as extern in all other modules which #include those

 * header files.

 */

#define DEFINE_AML_GLOBALS

#include <acpi/acpi.h>

#include <acpi/acinterp.h>

#include <acpi/amlcode.h>

#include <acpi/acevents.h>

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exutils")

/* Local prototypes */

static u32 acpi_ex_digits_needed(acpi_integer value, u32 base);

#ifndef ACPI_NO_METHOD_EXECUTION

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

 *

 * FUNCTION:    acpi_ex_enter_interpreter

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Enter the interpreter execution region. Failure to enter

 *              the interpreter region is a fatal system error. Used in

 *              conjunction with exit_interpreter.

 *

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

void acpi_ex_enter_interpreter(void)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_enter_interpreter);

        status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);

        if (ACPI_FAILURE(status)) {

                ACPI_ERROR((AE_INFO,

                            "Could not acquire AML Interpreter mutex"));

        }

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_reacquire_interpreter

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Reacquire the interpreter execution region from within the

 *              interpreter code. Failure to enter the interpreter region is a

 *              fatal system error. Used in  conjuction with

 *              relinquish_interpreter

 *

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

void acpi_ex_reacquire_interpreter(void)

{

        ACPI_FUNCTION_TRACE(ex_reacquire_interpreter);

        /*

         * If the global serialized flag is set, do not release the interpreter,

         * since it was not actually released by acpi_ex_relinquish_interpreter.

         * This forces the interpreter to be single threaded.

         */

        if (!acpi_gbl_all_methods_serialized) {

                acpi_ex_enter_interpreter();

        }

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_exit_interpreter

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Exit the interpreter execution region. This is the top level

 *              routine used to exit the interpreter when all processing has

 *              been completed.

 *

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

void acpi_ex_exit_interpreter(void)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_exit_interpreter);

        status = acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);

        if (ACPI_FAILURE(status)) {

                ACPI_ERROR((AE_INFO,

                            "Could not release AML Interpreter mutex"));

        }

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_relinquish_interpreter

 *

 * PARAMETERS:  None

 *

 * RETURN:      None

 *

 * DESCRIPTION: Exit the interpreter execution region, from within the

 *              interpreter - before attempting an operation that will possibly

 *              block the running thread.

 *

 * Cases where the interpreter is unlocked internally

 *      1) Method to be blocked on a Sleep() AML opcode

 *      2) Method to be blocked on an Acquire() AML opcode

 *      3) Method to be blocked on a Wait() AML opcode

 *      4) Method to be blocked to acquire the global lock

 *      5) Method to be blocked waiting to execute a serialized control method

 *          that is currently executing

 *      6) About to invoke a user-installed opregion handler

 *

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

void acpi_ex_relinquish_interpreter(void)

{

        ACPI_FUNCTION_TRACE(ex_relinquish_interpreter);

        /*

         * If the global serialized flag is set, do not release the interpreter.

         * This forces the interpreter to be single threaded.

         */

        if (!acpi_gbl_all_methods_serialized) {

                acpi_ex_exit_interpreter();

        }

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_truncate_for32bit_table

 *

 * PARAMETERS:  obj_desc        - Object to be truncated

 *

 * RETURN:      none

 *

 * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is

 *              32-bit, as determined by the revision of the DSDT.

 *

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

void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)

{

        ACPI_FUNCTION_ENTRY();

        /*

         * Object must be a valid number and we must be executing

         * a control method

         */

        if ((!obj_desc) ||

            (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_INTEGER)) {

                return;

        }

        if (acpi_gbl_integer_byte_width == 4) {

                /*

                 * We are running a method that exists in a 32-bit ACPI table.

                 * Truncate the value to 32 bits by zeroing out the upper 32-bit field

                 */

                obj_desc->integer.value &= (acpi_integer) ACPI_UINT32_MAX;

        }

}

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

 *

 * FUNCTION:    acpi_ex_acquire_global_lock

 *

 * PARAMETERS:  field_flags           - Flags with Lock rule:

 *                                      always_lock or never_lock

 *

 * RETURN:      TRUE/FALSE indicating whether the lock was actually acquired

 *

 * DESCRIPTION: Obtain the global lock and keep track of this fact via two

 *              methods.  A global variable keeps the state of the lock, and

 *              the state is returned to the caller.

 *

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

u8 acpi_ex_acquire_global_lock(u32 field_flags)

{

        u8 locked = FALSE;

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_acquire_global_lock);

        /* Only attempt lock if the always_lock bit is set */

        if (field_flags & AML_FIELD_LOCK_RULE_MASK) {

                /* We should attempt to get the lock, wait forever */

                status = acpi_ev_acquire_global_lock(ACPI_WAIT_FOREVER);

                if (ACPI_SUCCESS(status)) {

                        locked = TRUE;

                } else {

                        ACPI_EXCEPTION((AE_INFO, status,

                                        "Could not acquire Global Lock"));

                }

        }

        return_UINT8(locked);

}

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

 *

 * FUNCTION:    acpi_ex_release_global_lock

 *

 * PARAMETERS:  locked_by_me    - Return value from corresponding call to

 *                                acquire_global_lock.

 *

 * RETURN:      None

 *

 * DESCRIPTION: Release the global lock if it is locked.

 *

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

void acpi_ex_release_global_lock(u8 locked_by_me)

{

        acpi_status status;

        ACPI_FUNCTION_TRACE(ex_release_global_lock);

        /* Only attempt unlock if the caller locked it */

        if (locked_by_me) {

                /* OK, now release the lock */

                status = acpi_ev_release_global_lock();

                if (ACPI_FAILURE(status)) {

                        /* Report the error, but there isn't much else we can do */

                        ACPI_EXCEPTION((AE_INFO, status,

                                        "Could not release ACPI Global Lock"));

                }

        }

        return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_digits_needed

 *

 * PARAMETERS:  Value           - Value to be represented

 *              Base            - Base of representation

 *

 * RETURN:      The number of digits.

 *

 * DESCRIPTION: Calculate the number of digits needed to represent the Value

 *              in the given Base (Radix)

 *

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

static u32 acpi_ex_digits_needed(acpi_integer value, u32 base)

{

        u32 num_digits;

        acpi_integer current_value;

        ACPI_FUNCTION_TRACE(ex_digits_needed);

        /* acpi_integer is unsigned, so we don't worry about a '-' prefix */

        if (value == 0) {

                return_UINT32(1);

        }

        current_value = value;

        num_digits = 0;

        /* Count the digits in the requested base */

        while (current_value) {

                (void)acpi_ut_short_divide(current_value, base, &current_value,

                                           NULL);

                num_digits++;

        }

        return_UINT32(num_digits);

}

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

 *

 * FUNCTION:    acpi_ex_eisa_id_to_string

 *

 * PARAMETERS:  numeric_id      - EISA ID to be converted

 *              out_string      - Where to put the converted string (8 bytes)

 *

 * RETURN:      None

 *

 * DESCRIPTION: Convert a numeric EISA ID to string representation

 *

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

void acpi_ex_eisa_id_to_string(u32 numeric_id, char *out_string)

{

        u32 eisa_id;

        ACPI_FUNCTION_ENTRY();

        /* Swap ID to big-endian to get contiguous bits */

        eisa_id = acpi_ut_dword_byte_swap(numeric_id);

        out_string[0] = (char)('@' + (((unsigned long)eisa_id >> 26) & 0x1f));

        out_string[1] = (char)('@' + ((eisa_id >> 21) & 0x1f));

        out_string[2] = (char)('@' + ((eisa_id >> 16) & 0x1f));

        out_string[3] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 12);

        out_string[4] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 8);

        out_string[5] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 4);

        out_string[6] = acpi_ut_hex_to_ascii_char((acpi_integer) eisa_id, 0);

        out_string[7] = 0;

}

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

 *

 * FUNCTION:    acpi_ex_unsigned_integer_to_string

 *

 * PARAMETERS:  Value           - Value to be converted

 *              out_string      - Where to put the converted string (8 bytes)

 *

 * RETURN:      None, string

 *

 * DESCRIPTION: Convert a number to string representation. Assumes string

 *              buffer is large enough to hold the string.

 *

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

void acpi_ex_unsigned_integer_to_string(acpi_integer value, char *out_string)

{

        u32 count;

        u32 digits_needed;

        u32 remainder;

        ACPI_FUNCTION_ENTRY();

        digits_needed = acpi_ex_digits_needed(value, 10);

        out_string[digits_needed] = 0;

        for (count = digits_needed; count > 0; count--) {

                (void)acpi_ut_short_divide(value, 10, &value, &remainder);

                out_string[count - 1] = (char)('0' + remainder);

        }

}

#endif