/******************************************************************************
*
* Module Name: exutils - interpreter/scanner utilities
*
*****************************************************************************/
/*
* 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.
*/
/*
* 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")
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
*
* FUNCTION: acpi_ex_enter_interpreter
*
* PARAMETERS: None
*
* DESCRIPTION: Enter the interpreter execution region. Failure to enter
* the interpreter region is a fatal system error
*
******************************************************************************/
acpi_status
acpi_ex_enter_interpreter (void)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("ex_enter_interpreter");
status = acpi_ut_acquire_mutex (ACPI_MTX_EXECUTE);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR (("Could not acquire interpreter mutex\n"));
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_exit_interpreter
*
* PARAMETERS: None
*
* DESCRIPTION: Exit the interpreter execution region
*
* Cases where the interpreter is unlocked:
* 1) Completion of the execution of a control method
* 2) Method blocked on a Sleep() AML opcode
* 3) Method blocked on an Acquire() AML opcode
* 4) Method blocked on a Wait() AML opcode
* 5) Method blocked to acquire the global lock
* 6) Method blocked to execute a serialized control method that is
* already executing
* 7) 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_EXECUTE);
if (ACPI_FAILURE (status)) {
ACPI_REPORT_ERROR (("Could not release interpreter mutex\n"));
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_truncate_for32bit_table
*
* PARAMETERS: obj_desc - Object to be truncated
*
* RETURN: none
*
* DESCRIPTION: Truncate a number to 32-bits if the currently executing method
* belongs to a 32-bit ACPI table.
*
******************************************************************************/
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_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not acquire Global Lock, %s\n",
acpi_format_exception (status)));
}
}
return_VALUE (locked);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_release_global_lock
*
* PARAMETERS: locked_by_me - Return value from corresponding call to
* acquire_global_lock.
*
* RETURN: Status
*
* 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_REPORT_ERROR (("Could not release ACPI Global Lock, %s\n",
acpi_format_exception (status)));
}
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_digits_needed
*
* PARAMETERS: Value - Value to be represented
* Base - Base of representation
*
* RETURN: the number of digits needed to represent Value in Base
*
******************************************************************************/
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_VALUE (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_VALUE (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)
*
* 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: Convert a number to string representation
*
******************************************************************************/
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
