utmisc.c

h内核

/*******************************************************************************
 *
 * 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_print_string
 *
 * PARAMETERS:  String          - Null terminated ASCII string
 *
 * 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
 *
 * 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:  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:  Character           - The character to be examined
 *
 * RETURN:      1 if Character may appear in a name, else 0
 *
 * 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;
	acpi_integer                    return_value = 0;
	acpi_integer                    quotient;


	ACPI_FUNCTION_TRACE ("ut_stroul64");


	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)) == 'x')) {
			base = 16;
			++string;
		}
		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)) == 'x') {
		string++;
	}

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

				this_digit = this_digit - 'A' + 10;
			}
			else {
				goto error_exit;
			}
		}

		/* Check to see if digit is out of range */

		if (this_digit >= base) {
			goto error_exit;
		}

		/* 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;
	}

	*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_strupr
 *
 * PARAMETERS:  src_string      - The source string to convert to
 *
 * RETURN:      src_string
 *
 * DESCRIPTION: Convert string to uppercase
 *
 ******************************************************************************/
#ifdef ACPI_FUTURE_USAGE
char *
acpi_ut_strupr (
	char                            *src_string)
{
	char                            *string;