Subversion Repositories Kolibri OS

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

 *

 * Module Name: exutils - interpreter/scanner utilities

 *

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

/*

 * Copyright (C) 2000 - 2015, 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.

 */

/*

 * 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 

#include "accommon.h"

#include "acinterp.h"

#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER

ACPI_MODULE_NAME("exutils")

/* Local prototypes */

static u32 acpi_ex_digits_needed(u64 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_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, or when the method blocks.

 *

 * Cases where the interpreter is unlocked internally:

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

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

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

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

 *      5) Method will 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_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_truncate_for32bit_table

 *

 * PARAMETERS:  obj_desc        - Object to be truncated

 *

 * RETURN:      TRUE if a truncation was performed, FALSE otherwise.

 *

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

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

 *

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

u8 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. Object could be NS node for AML_INT_NAMEPATH_OP.

	 */

	if ((!obj_desc) ||

	    (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) ||

	    (obj_desc->common.type != ACPI_TYPE_INTEGER)) {

		return (FALSE);

	}

	if ((acpi_gbl_integer_byte_width == 4) &&

	    (obj_desc->integer.value > (u64)ACPI_UINT32_MAX)) {

		/*

		 * We are executing in a 32-bit ACPI table.

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

		 */

		obj_desc->integer.value &= (u64)ACPI_UINT32_MAX;

		return (TRUE);

	}

	return (FALSE);

}

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

 *

 * FUNCTION:    acpi_ex_acquire_global_lock

 *

 * PARAMETERS:  field_flags           - Flags with Lock rule:

 *                                      always_lock or never_lock

 *

 * RETURN:      None

 *

 * DESCRIPTION: Obtain the ACPI hardware Global Lock, only if the field

 *              flags specifiy that it is to be obtained before field access.

 *

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

void acpi_ex_acquire_global_lock(u32 field_flags)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(ex_acquire_global_lock);

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

	if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {

		return_VOID;

	}

	/* Attempt to get the global lock, wait forever */

	status = acpi_ex_acquire_mutex_object(ACPI_WAIT_FOREVER,

					      acpi_gbl_global_lock_mutex,

					      acpi_os_get_thread_id());

	if (ACPI_FAILURE(status)) {

		ACPI_EXCEPTION((AE_INFO, status,

				"Could not acquire Global Lock"));

	}

	return_VOID;

}

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

 *

 * FUNCTION:    acpi_ex_release_global_lock

 *

 * PARAMETERS:  field_flags           - Flags with Lock rule:

 *                                      always_lock or never_lock

 *

 * RETURN:      None

 *

 * DESCRIPTION: Release the ACPI hardware Global Lock

 *

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

void acpi_ex_release_global_lock(u32 field_flags)

{

	acpi_status status;

	ACPI_FUNCTION_TRACE(ex_release_global_lock);

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

	if (!(field_flags & AML_FIELD_LOCK_RULE_MASK)) {

		return_VOID;

	}

	/* Release the global lock */

	status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);

	if (ACPI_FAILURE(status)) {

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

		ACPI_EXCEPTION((AE_INFO, status,

				"Could not release 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(u64 value, u32 base)

{

	u32 num_digits;

	u64 current_value;

	ACPI_FUNCTION_TRACE(ex_digits_needed);

	/* u64 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, ¤t_value,

					   NULL);

		num_digits++;

	}

	return_UINT32(num_digits);

}

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

 *

 * FUNCTION:    acpi_ex_eisa_id_to_string

 *

 * PARAMETERS:  compressed_id   - EISAID to be converted

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

 *

 * RETURN:      None

 *

 * DESCRIPTION: Convert a numeric EISAID to string representation. Return

 *              buffer must be large enough to hold the string. The string

 *              returned is always exactly of length ACPI_EISAID_STRING_SIZE

 *              (includes null terminator). The EISAID is always 32 bits.

 *

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

void acpi_ex_eisa_id_to_string(char *out_string, u64 compressed_id)

{

	u32 swapped_id;

	ACPI_FUNCTION_ENTRY();

	/* The EISAID should be a 32-bit integer */

	if (compressed_id > ACPI_UINT32_MAX) {

		ACPI_WARNING((AE_INFO,

			      "Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating",

			      ACPI_FORMAT_UINT64(compressed_id)));

	}

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

	swapped_id = acpi_ut_dword_byte_swap((u32)compressed_id);

	/* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */

	out_string[0] =

	    (char)(0x40 + (((unsigned long)swapped_id >> 26) & 0x1F));

	out_string[1] = (char)(0x40 + ((swapped_id >> 21) & 0x1F));

	out_string[2] = (char)(0x40 + ((swapped_id >> 16) & 0x1F));

	out_string[3] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 12);

	out_string[4] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 8);

	out_string[5] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 4);

	out_string[6] = acpi_ut_hex_to_ascii_char((u64) swapped_id, 0);

	out_string[7] = 0;

}

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

 *

 * FUNCTION:    acpi_ex_integer_to_string

 *

 * PARAMETERS:  out_string      - Where to put the converted string. At least

 *                                21 bytes are needed to hold the largest

 *                                possible 64-bit integer.

 *              value           - Value to be converted

 *

 * RETURN:      None, string

 *

 * DESCRIPTION: Convert a 64-bit integer to decimal string representation.

 *              Assumes string buffer is large enough to hold the string. The

 *              largest string is (ACPI_MAX64_DECIMAL_DIGITS + 1).

 *

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

void acpi_ex_integer_to_string(char *out_string, u64 value)

{

	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);

	}

}

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

 *

 * FUNCTION:    acpi_ex_pci_cls_to_string

 *

 * PARAMETERS:  out_string      - Where to put the converted string (7 bytes)

 * PARAMETERS:  class_code      - PCI class code to be converted (3 bytes)

 *

 * RETURN:      None

 *

 * DESCRIPTION: Convert 3-bytes PCI class code to string representation.

 *              Return buffer must be large enough to hold the string. The

 *              string returned is always exactly of length

 *              ACPI_PCICLS_STRING_SIZE (includes null terminator).

 *

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

void acpi_ex_pci_cls_to_string(char *out_string, u8 class_code[3])

{

	ACPI_FUNCTION_ENTRY();

	/* All 3 bytes are hexadecimal */

	out_string[0] = acpi_ut_hex_to_ascii_char((u64)class_code[0], 4);

	out_string[1] = acpi_ut_hex_to_ascii_char((u64)class_code[0], 0);

	out_string[2] = acpi_ut_hex_to_ascii_char((u64)class_code[1], 4);

	out_string[3] = acpi_ut_hex_to_ascii_char((u64)class_code[1], 0);

	out_string[4] = acpi_ut_hex_to_ascii_char((u64)class_code[2], 4);

	out_string[5] = acpi_ut_hex_to_ascii_char((u64)class_code[2], 0);

	out_string[6] = 0;

}

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

 *

 * FUNCTION:    acpi_is_valid_space_id

 *

 * PARAMETERS:  space_id            - ID to be validated

 *

 * RETURN:      TRUE if valid/supported ID.

 *

 * DESCRIPTION: Validate an operation region space_ID.

 *

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

u8 acpi_is_valid_space_id(u8 space_id)

{

	if ((space_id >= ACPI_NUM_PREDEFINED_REGIONS) &&

	    (space_id < ACPI_USER_REGION_BEGIN) &&

	    (space_id != ACPI_ADR_SPACE_DATA_TABLE) &&

	    (space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {

		return (FALSE);

	}

	return (TRUE);

}

#endif