kernel-ark/drivers/acpi/executer/exutils.c
Bob Moore b8e4d89357 [ACPI] ACPICA 20060127
Implemented support in the Resource Manager to allow
unresolved namestring references within resource package
objects for the _PRT method. This support is in addition
to the previously implemented unresolved reference
support within the AML parser. If the interpreter slack
mode is enabled (true on Linux unless acpi=strict),
these unresolved references will be passed through
to the caller as a NULL package entry.
http://bugzilla.kernel.org/show_bug.cgi?id=5741

Implemented and deployed new macros and functions for
error and warning messages across the subsystem. These
macros are simpler and generate less code than their
predecessors. The new macros ACPI_ERROR, ACPI_EXCEPTION,
ACPI_WARNING, and ACPI_INFO replace the ACPI_REPORT_*
macros.

Implemented the acpi_cpu_flags type to simplify host OS
integration of the Acquire/Release Lock OSL interfaces.
Suggested by Steven Rostedt and Andrew Morton.

Fixed a problem where Alias ASL operators are sometimes
not correctly resolved. causing AE_AML_INTERNAL
http://bugzilla.kernel.org/show_bug.cgi?id=5189
http://bugzilla.kernel.org/show_bug.cgi?id=5674

Fixed several problems with the implementation of the
ConcatenateResTemplate ASL operator. As per the ACPI
specification, zero length buffers are now treated as a
single EndTag. One-length buffers always cause a fatal
exception. Non-zero length buffers that do not end with
a full 2-byte EndTag cause a fatal exception.

Fixed a possible structure overwrite in the
AcpiGetObjectInfo external interface. (With assistance
from Thomas Renninger)

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-01-31 03:25:09 -05:00

353 lines
11 KiB
C

/******************************************************************************
*
* Module Name: exutils - interpreter/scanner utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, 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: Status
*
* 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_ERROR((AE_INFO, "Could not acquire interpreter mutex"));
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_exit_interpreter
*
* PARAMETERS: None
*
* RETURN: 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_ERROR((AE_INFO, "Could not release interpreter mutex"));
}
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_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