[ACPI] ACPICA 20051117

[linux-2.6/cjktty.git] / drivers / acpi / utilities / utmisc.c

/*******************************************************************************
 *
 * Module Name: utmisc - common utility procedures
 *
 ******************************************************************************/

/*
 * Copyright (C) 2000 - 2005, 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/acnamesp.h>

#define _COMPONENT          ACPI_UTILITIES
ACPI_MODULE_NAME("utmisc")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_allocate_owner_id
 *
 * PARAMETERS:  owner_id        - Where the new owner ID is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Allocate a table or method owner ID. The owner ID is used to
 *              track objects created by the table or method, to be deleted
 *              when the method exits or the table is unloaded.
 *
 ******************************************************************************/
acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
{
        acpi_native_uint i;
        acpi_native_uint j;
        acpi_status status;

        ACPI_FUNCTION_TRACE("ut_allocate_owner_id");

        /* Guard against multiple allocations of ID to the same location */

        if (*owner_id) {
                ACPI_REPORT_ERROR(("Owner ID [%2.2X] already exists\n",
                                   *owner_id));
                return_ACPI_STATUS(AE_ALREADY_EXISTS);
        }

        /* Mutex for the global ID mask */

        status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /*
         * Find a free owner ID, cycle through all possible IDs on repeated
         * allocations. Note: Index for next possible ID is equal to the value
         * of the last allocated ID.
         */
        for (i = 0, j = acpi_gbl_last_owner_id; i < 32; i++, j++) {
                if (j >= 32) {
                        j = 0;  /* Wraparound to ID start */
                }

                if (!(acpi_gbl_owner_id_mask & (1 << j))) {
                        /*
                         * Found a free ID. The actual ID is the bit index plus one,
                         * making zero an invalid Owner ID. Save this as the last ID
                         * allocated and update the global ID mask.
                         */
                        acpi_gbl_last_owner_id = (acpi_owner_id) (j + 1);
                        *owner_id = acpi_gbl_last_owner_id;

                        ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
                                          "Current owner_id mask: %8.8X New ID: %2.2X\n",
                                          acpi_gbl_owner_id_mask,
                                          (unsigned int)
                                          acpi_gbl_last_owner_id));

                        acpi_gbl_owner_id_mask |= (1 << j);
                        goto exit;
                }
        }

        /*
         * All owner_ids have been allocated. This typically should
         * not happen since the IDs are reused after deallocation. The IDs are
         * allocated upon table load (one per table) and method execution, and
         * they are released when a table is unloaded or a method completes
         * execution.
         *
         * If this error happens, there may be very deep nesting of invoked control
         * methods, or there may be a bug where the IDs are not released.
         */
        status = AE_OWNER_ID_LIMIT;
        ACPI_REPORT_ERROR(("Could not allocate new owner_id (32 max), AE_OWNER_ID_LIMIT\n"));

      exit:
        (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_release_owner_id
 *
 * PARAMETERS:  owner_id_ptr        - Pointer to a previously allocated owner_iD
 *
 * RETURN:      None. No error is returned because we are either exiting a
 *              control method or unloading a table. Either way, we would
 *              ignore any error anyway.
 *
 * DESCRIPTION: Release a table or method owner ID.  Valid IDs are 1 - 32
 *
 ******************************************************************************/

void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
{
        acpi_owner_id owner_id = *owner_id_ptr;
        acpi_status status;

        ACPI_FUNCTION_TRACE_U32("ut_release_owner_id", owner_id);

        /* Always clear the input owner_id (zero is an invalid ID) */

        *owner_id_ptr = 0;

        /* Zero is not a valid owner_iD */

        if ((owner_id == 0) || (owner_id > 32)) {
                ACPI_REPORT_ERROR(("Invalid owner_id: %2.2X\n", owner_id));
                return_VOID;
        }

        /* Mutex for the global ID mask */

        status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
        if (ACPI_FAILURE(status)) {
                return_VOID;
        }

        /* Normalize the ID to zero */

        owner_id--;

        /* Free the owner ID only if it is valid */

        if (acpi_gbl_owner_id_mask & (1 << owner_id)) {
                acpi_gbl_owner_id_mask ^= (1 << owner_id);
        }

        (void)acpi_ut_release_mutex(ACPI_MTX_CACHES);
        return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_strupr (strupr)
 *
 * PARAMETERS:  src_string      - The source string to convert
 *
 * RETURN:      None
 *
 * DESCRIPTION: Convert string to uppercase
 *
 * NOTE: This is not a POSIX function, so it appears here, not in utclib.c
 *
 ******************************************************************************/

void acpi_ut_strupr(char *src_string)
{
        char *string;

        ACPI_FUNCTION_ENTRY();

        if (!src_string) {
                return;
        }

        /* Walk entire string, uppercasing the letters */

        for (string = src_string; *string; string++) {
                *string = (char)ACPI_TOUPPER(*string);
        }

        return;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_print_string
 *
 * PARAMETERS:  String          - Null terminated ASCII string
 *              max_length      - Maximum output length
 *
 * RETURN:      None
 *
 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
 *              sequences.
 *
 ******************************************************************************/

void acpi_ut_print_string(char *string, u8 max_length)
{
        u32 i;

        if (!string) {
                acpi_os_printf("<\"NULL STRING PTR\">");
                return;
        }

        acpi_os_printf("\"");
        for (i = 0; string[i] && (i < max_length); i++) {
                /* Escape sequences */

                switch (string[i]) {
                case 0x07:
                        acpi_os_printf("\\a");  /* BELL */
                        break;

                case 0x08:
                        acpi_os_printf("\\b");  /* BACKSPACE */
                        break;

                case 0x0C:
                        acpi_os_printf("\\f");  /* FORMFEED */
                        break;

                case 0x0A:
                        acpi_os_printf("\\n");  /* LINEFEED */
                        break;

                case 0x0D:
                        acpi_os_printf("\\r");  /* CARRIAGE RETURN */
                        break;

                case 0x09:
                        acpi_os_printf("\\t");  /* HORIZONTAL TAB */
                        break;

                case 0x0B:
                        acpi_os_printf("\\v");  /* VERTICAL TAB */
                        break;

                case '\'':      /* Single Quote */
                case '\"':      /* Double Quote */
                case '\\':      /* Backslash */
                        acpi_os_printf("\\%c", (int)string[i]);
                        break;

                default:

                        /* Check for printable character or hex escape */

                        if (ACPI_IS_PRINT(string[i])) {
                                /* This is a normal character */

                                acpi_os_printf("%c", (int)string[i]);
                        } else {
                                /* All others will be Hex escapes */

                                acpi_os_printf("\\x%2.2X", (s32) string[i]);
                        }
                        break;
                }
        }
        acpi_os_printf("\"");

        if (i == max_length && string[i]) {
                acpi_os_printf("...");
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_dword_byte_swap
 *
 * PARAMETERS:  Value           - Value to be converted
 *
 * RETURN:      u32 integer with bytes swapped
 *
 * DESCRIPTION: Convert a 32-bit value to big-endian (swap the bytes)
 *
 ******************************************************************************/

u32 acpi_ut_dword_byte_swap(u32 value)
{
        union {
                u32 value;
                u8 bytes[4];
        } out;
        union {
                u32 value;
                u8 bytes[4];
        } in;

        ACPI_FUNCTION_ENTRY();

        in.value = value;

        out.bytes[0] = in.bytes[3];
        out.bytes[1] = in.bytes[2];
        out.bytes[2] = in.bytes[1];
        out.bytes[3] = in.bytes[0];

        return (out.value);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_set_integer_width
 *
 * PARAMETERS:  Revision            From DSDT header
 *
 * RETURN:      None
 *
 * DESCRIPTION: Set the global integer bit width based upon the revision
 *              of the DSDT.  For Revision 1 and 0, Integers are 32 bits.
 *              For Revision 2 and above, Integers are 64 bits.  Yes, this
 *              makes a difference.
 *
 ******************************************************************************/

void acpi_ut_set_integer_width(u8 revision)
{

        if (revision <= 1) {
                acpi_gbl_integer_bit_width = 32;
                acpi_gbl_integer_nybble_width = 8;
                acpi_gbl_integer_byte_width = 4;
        } else {
                acpi_gbl_integer_bit_width = 64;
                acpi_gbl_integer_nybble_width = 16;
                acpi_gbl_integer_byte_width = 8;
        }
}

#ifdef ACPI_DEBUG_OUTPUT
/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_display_init_pathname
 *
 * PARAMETERS:  Type                - Object type of the node
 *              obj_handle          - Handle whose pathname will be displayed
 *              Path                - Additional path string to be appended.
 *                                      (NULL if no extra path)
 *
 * RETURN:      acpi_status
 *
 * DESCRIPTION: Display full pathname of an object, DEBUG ONLY
 *
 ******************************************************************************/

void
acpi_ut_display_init_pathname(u8 type,
                              struct acpi_namespace_node *obj_handle,
                              char *path)
{
        acpi_status status;
        struct acpi_buffer buffer;

        ACPI_FUNCTION_ENTRY();

        /* Only print the path if the appropriate debug level is enabled */

        if (!(acpi_dbg_level & ACPI_LV_INIT_NAMES)) {
                return;
        }

        /* Get the full pathname to the node */

        buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
        status = acpi_ns_handle_to_pathname(obj_handle, &buffer);
        if (ACPI_FAILURE(status)) {
                return;
        }

        /* Print what we're doing */

        switch (type) {
        case ACPI_TYPE_METHOD:
                acpi_os_printf("Executing  ");
                break;

        default:
                acpi_os_printf("Initializing ");
                break;
        }

        /* Print the object type and pathname */

        acpi_os_printf("%-12s %s",
                       acpi_ut_get_type_name(type), (char *)buffer.pointer);

        /* Extra path is used to append names like _STA, _INI, etc. */

        if (path) {
                acpi_os_printf(".%s", path);
        }
        acpi_os_printf("\n");

        ACPI_MEM_FREE(buffer.pointer);
}
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_valid_acpi_name
 *
 * PARAMETERS:  Name            - The name to be examined
 *
 * RETURN:      TRUE if the name is valid, FALSE otherwise
 *
 * DESCRIPTION: Check for a valid ACPI name.  Each character must be one of:
 *              1) Upper case alpha
 *              2) numeric
 *              3) underscore
 *
 ******************************************************************************/

u8 acpi_ut_valid_acpi_name(u32 name)
{
        char *name_ptr = (char *)&name;
        char character;
        acpi_native_uint i;

        ACPI_FUNCTION_ENTRY();

        for (i = 0; i < ACPI_NAME_SIZE; i++) {
                character = *name_ptr;
                name_ptr++;

                if (!((character == '_') ||
                      (character >= 'A' && character <= 'Z') ||
                      (character >= '0' && character <= '9'))) {
                        return (FALSE);
                }
        }

        return (TRUE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_valid_acpi_character
 *
 * PARAMETERS:  Character           - The character to be examined
 *
 * RETURN:      1 if Character may appear in a name, else 0
 *
 * DESCRIPTION: Check for a printable character
 *
 ******************************************************************************/

u8 acpi_ut_valid_acpi_character(char character)
{

        ACPI_FUNCTION_ENTRY();

        return ((u8) ((character == '_') ||
                      (character >= 'A' && character <= 'Z') ||
                      (character >= '0' && character <= '9')));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_strtoul64
 *
 * PARAMETERS:  String          - Null terminated string
 *              Base            - Radix of the string: 10, 16, or ACPI_ANY_BASE
 *              ret_integer     - Where the converted integer is returned
 *
 * RETURN:      Status and Converted value
 *
 * DESCRIPTION: Convert a string into an unsigned value.
 *              NOTE: Does not support Octal strings, not needed.
 *
 ******************************************************************************/

acpi_status
acpi_ut_strtoul64(char *string, u32 base, acpi_integer * ret_integer)
{
        u32 this_digit = 0;
        acpi_integer return_value = 0;
        acpi_integer quotient;

        ACPI_FUNCTION_TRACE("ut_stroul64");

        if ((!string) || !(*string)) {
                goto error_exit;
        }

        switch (base) {
        case ACPI_ANY_BASE:
        case 10:
        case 16:
                break;

        default:
                /* Invalid Base */
                return_ACPI_STATUS(AE_BAD_PARAMETER);
        }

        /* Skip over any white space in the buffer */

        while (ACPI_IS_SPACE(*string) || *string == '\t') {
                string++;
        }

        /*
         * If the input parameter Base is zero, then we need to
         * determine if it is decimal or hexadecimal:
         */
        if (base == 0) {
                if ((*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
                        base = 16;
                        string += 2;
                } else {
                        base = 10;
                }
        }

        /*
         * For hexadecimal base, skip over the leading
         * 0 or 0x, if they are present.
         */
        if ((base == 16) &&
            (*string == '0') && (ACPI_TOLOWER(*(string + 1)) == 'x')) {
                string += 2;
        }

        /* Any string left? */

        if (!(*string)) {
                goto error_exit;
        }

        /* Main loop: convert the string to a 64-bit integer */

        while (*string) {
                if (ACPI_IS_DIGIT(*string)) {
                        /* Convert ASCII 0-9 to Decimal value */

                        this_digit = ((u8) * string) - '0';
                } else {
                        if (base == 10) {
                                /* Digit is out of range */

                                goto error_exit;
                        }

                        this_digit = (u8) ACPI_TOUPPER(*string);
                        if (ACPI_IS_XDIGIT((char)this_digit)) {
                                /* Convert ASCII Hex char to value */

                                this_digit = this_digit - 'A' + 10;
                        } else {
                                /*
                                 * We allow non-hex chars, just stop now, same as end-of-string.
                                 * See ACPI spec, string-to-integer conversion.
                                 */
                                break;
                        }
                }

                /* Divide the digit into the correct position */

                (void)
                    acpi_ut_short_divide((ACPI_INTEGER_MAX -
                                          (acpi_integer) this_digit), base,
                                         &quotient, NULL);
                if (return_value > quotient) {
                        goto error_exit;
                }

                return_value *= base;
                return_value += this_digit;
                string++;
        }

        /* All done, normal exit */

        *ret_integer = return_value;
        return_ACPI_STATUS(AE_OK);

      error_exit:
        /* Base was set/validated above */

        if (base == 10) {
                return_ACPI_STATUS(AE_BAD_DECIMAL_CONSTANT);
        } else {
                return_ACPI_STATUS(AE_BAD_HEX_CONSTANT);
        }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_create_update_state_and_push
 *
 * PARAMETERS:  Object          - Object to be added to the new state
 *              Action          - Increment/Decrement
 *              state_list      - List the state will be added to
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create a new state and push it
 *
 ******************************************************************************/

acpi_status
acpi_ut_create_update_state_and_push(union acpi_operand_object *object,
                                     u16 action,
                                     union acpi_generic_state **state_list)
{
        union acpi_generic_state *state;

        ACPI_FUNCTION_ENTRY();

        /* Ignore null objects; these are expected */

        if (!object) {
                return (AE_OK);
        }

        state = acpi_ut_create_update_state(object, action);
        if (!state) {
                return (AE_NO_MEMORY);
        }

        acpi_ut_push_generic_state(state_list, state);
        return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_walk_package_tree
 *
 * PARAMETERS:  source_object       - The package to walk
 *              target_object       - Target object (if package is being copied)
 *              walk_callback       - Called once for each package element
 *              Context             - Passed to the callback function
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk through a package
 *
 ******************************************************************************/

acpi_status
acpi_ut_walk_package_tree(union acpi_operand_object * source_object,
                          void *target_object,
                          acpi_pkg_callback walk_callback, void *context)
{
        acpi_status status = AE_OK;
        union acpi_generic_state *state_list = NULL;
        union acpi_generic_state *state;
        u32 this_index;
        union acpi_operand_object *this_source_obj;

        ACPI_FUNCTION_TRACE("ut_walk_package_tree");

        state = acpi_ut_create_pkg_state(source_object, target_object, 0);
        if (!state) {
                return_ACPI_STATUS(AE_NO_MEMORY);
        }

        while (state) {
                /* Get one element of the package */

                this_index = state->pkg.index;
                this_source_obj = (union acpi_operand_object *)
                    state->pkg.source_object->package.elements[this_index];

                /*
                 * Check for:
                 * 1) An uninitialized package element.  It is completely
                 *    legal to declare a package and leave it uninitialized
                 * 2) Not an internal object - can be a namespace node instead
                 * 3) Any type other than a package.  Packages are handled in else
                 *    case below.
                 */
                if ((!this_source_obj) ||
                    (ACPI_GET_DESCRIPTOR_TYPE(this_source_obj) !=
                     ACPI_DESC_TYPE_OPERAND)
                    || (ACPI_GET_OBJECT_TYPE(this_source_obj) !=
                        ACPI_TYPE_PACKAGE)) {
                        status =
                            walk_callback(ACPI_COPY_TYPE_SIMPLE,
                                          this_source_obj, state, context);
                        if (ACPI_FAILURE(status)) {
                                return_ACPI_STATUS(status);
                        }

                        state->pkg.index++;
                        while (state->pkg.index >=
                               state->pkg.source_object->package.count) {
                                /*
                                 * We've handled all of the objects at this level,  This means
                                 * that we have just completed a package.  That package may
                                 * have contained one or more packages itself.
                                 *
                                 * Delete this state and pop the previous state (package).
                                 */
                                acpi_ut_delete_generic_state(state);
                                state = acpi_ut_pop_generic_state(&state_list);

                                /* Finished when there are no more states */

                                if (!state) {
                                        /*
                                         * We have handled all of the objects in the top level
                                         * package just add the length of the package objects
                                         * and exit
                                         */
                                        return_ACPI_STATUS(AE_OK);
                                }

                                /*
                                 * Go back up a level and move the index past the just
                                 * completed package object.
                                 */
                                state->pkg.index++;
                        }
                } else {
                        /* This is a subobject of type package */

                        status =
                            walk_callback(ACPI_COPY_TYPE_PACKAGE,
                                          this_source_obj, state, context);
                        if (ACPI_FAILURE(status)) {
                                return_ACPI_STATUS(status);
                        }

                        /*
                         * Push the current state and create a new one
                         * The callback above returned a new target package object.
                         */
                        acpi_ut_push_generic_state(&state_list, state);
                        state = acpi_ut_create_pkg_state(this_source_obj,
                                                         state->pkg.
                                                         this_target_obj, 0);
                        if (!state) {
                                return_ACPI_STATUS(AE_NO_MEMORY);
                        }
                }
        }

        /* We should never get here */

        return_ACPI_STATUS(AE_AML_INTERNAL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_generate_checksum
 *
 * PARAMETERS:  Buffer          - Buffer to be scanned
 *              Length          - number of bytes to examine
 *
 * RETURN:      The generated checksum
 *
 * DESCRIPTION: Generate a checksum on a raw buffer
 *
 ******************************************************************************/

u8 acpi_ut_generate_checksum(u8 * buffer, u32 length)
{
        u32 i;
        signed char sum = 0;

        for (i = 0; i < length; i++) {
                sum = (signed char)(sum + buffer[i]);
        }

        return ((u8) (0 - sum));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_report_error
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print error message
 *
 ******************************************************************************/

void acpi_ut_report_error(char *module_name, u32 line_number, u32 component_id)
{

        acpi_os_printf("%8s-%04d: *** Error: ", module_name, line_number);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_report_warning
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message
 *
 ******************************************************************************/

void
acpi_ut_report_warning(char *module_name, u32 line_number, u32 component_id)
{

        acpi_os_printf("%8s-%04d: *** Warning: ", module_name, line_number);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ut_report_info
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              component_id        - Caller's component ID (for error output)
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print information message
 *
 ******************************************************************************/

void acpi_ut_report_info(char *module_name, u32 line_number, u32 component_id)
{

        acpi_os_printf("%8s-%04d: *** Info: ", module_name, line_number);
}