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| Current File : //sys/contrib/dev/acpica/executer/exutils.c |
/******************************************************************************
*
* Module Name: exutils - interpreter/scanner utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, 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 __EXUTILS_C__
/*
* 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 <contrib/dev/acpica/include/acpi.h>
#include <contrib/dev/acpica/include/accommon.h>
#include <contrib/dev/acpica/include/acinterp.h>
#include <contrib/dev/acpica/include/amlcode.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exutils")
/* Local prototypes */
static UINT32
AcpiExDigitsNeeded (
UINT64 Value,
UINT32 Base);
#ifndef ACPI_NO_METHOD_EXECUTION
/*******************************************************************************
*
* FUNCTION: AcpiExEnterInterpreter
*
* 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 ExitInterpreter.
*
******************************************************************************/
void
AcpiExEnterInterpreter (
void)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExEnterInterpreter);
Status = AcpiUtAcquireMutex (ACPI_MTX_INTERPRETER);
if (ACPI_FAILURE (Status))
{
ACPI_ERROR ((AE_INFO, "Could not acquire AML Interpreter mutex"));
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiExReacquireInterpreter
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Reacquire the interpreter execution region from within the
* interpreter code. Failure to enter the interpreter region is a
* fatal system error. Used in conjuction with
* RelinquishInterpreter
*
******************************************************************************/
void
AcpiExReacquireInterpreter (
void)
{
ACPI_FUNCTION_TRACE (ExReacquireInterpreter);
/*
* If the global serialized flag is set, do not release the interpreter,
* since it was not actually released by AcpiExRelinquishInterpreter.
* This forces the interpreter to be single threaded.
*/
if (!AcpiGbl_AllMethodsSerialized)
{
AcpiExEnterInterpreter ();
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiExExitInterpreter
*
* 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.
*
******************************************************************************/
void
AcpiExExitInterpreter (
void)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExExitInterpreter);
Status = AcpiUtReleaseMutex (ACPI_MTX_INTERPRETER);
if (ACPI_FAILURE (Status))
{
ACPI_ERROR ((AE_INFO, "Could not release AML Interpreter mutex"));
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiExRelinquishInterpreter
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Exit the interpreter execution region, from within the
* interpreter - before attempting an operation that will possibly
* block the running thread.
*
* Cases where the interpreter is unlocked internally
* 1) Method to be blocked on a Sleep() AML opcode
* 2) Method to be blocked on an Acquire() AML opcode
* 3) Method to be blocked on a Wait() AML opcode
* 4) Method to be blocked to acquire the global lock
* 5) Method to be blocked waiting to execute a serialized control method
* that is currently executing
* 6) About to invoke a user-installed opregion handler
*
******************************************************************************/
void
AcpiExRelinquishInterpreter (
void)
{
ACPI_FUNCTION_TRACE (ExRelinquishInterpreter);
/*
* If the global serialized flag is set, do not release the interpreter.
* This forces the interpreter to be single threaded.
*/
if (!AcpiGbl_AllMethodsSerialized)
{
AcpiExExitInterpreter ();
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiExTruncateFor32bitTable
*
* PARAMETERS: ObjDesc - Object to be truncated
*
* RETURN: none
*
* DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
* 32-bit, as determined by the revision of the DSDT.
*
******************************************************************************/
void
AcpiExTruncateFor32bitTable (
ACPI_OPERAND_OBJECT *ObjDesc)
{
ACPI_FUNCTION_ENTRY ();
/*
* Object must be a valid number and we must be executing
* a control method. NS node could be there for AML_INT_NAMEPATH_OP.
*/
if ((!ObjDesc) ||
(ACPI_GET_DESCRIPTOR_TYPE (ObjDesc) != ACPI_DESC_TYPE_OPERAND) ||
(ObjDesc->Common.Type != ACPI_TYPE_INTEGER))
{
return;
}
if (AcpiGbl_IntegerByteWidth == 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
*/
ObjDesc->Integer.Value &= (UINT64) ACPI_UINT32_MAX;
}
}
/*******************************************************************************
*
* FUNCTION: AcpiExAcquireGlobalLock
*
* PARAMETERS: FieldFlags - Flags with Lock rule:
* AlwaysLock or NeverLock
*
* 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
AcpiExAcquireGlobalLock (
UINT32 FieldFlags)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExAcquireGlobalLock);
/* Only use the lock if the AlwaysLock bit is set */
if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
{
return_VOID;
}
/* Attempt to get the global lock, wait forever */
Status = AcpiExAcquireMutexObject (ACPI_WAIT_FOREVER,
AcpiGbl_GlobalLockMutex, AcpiOsGetThreadId ());
if (ACPI_FAILURE (Status))
{
ACPI_EXCEPTION ((AE_INFO, Status,
"Could not acquire Global Lock"));
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: AcpiExReleaseGlobalLock
*
* PARAMETERS: FieldFlags - Flags with Lock rule:
* AlwaysLock or NeverLock
*
* RETURN: None
*
* DESCRIPTION: Release the ACPI hardware Global Lock
*
******************************************************************************/
void
AcpiExReleaseGlobalLock (
UINT32 FieldFlags)
{
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE (ExReleaseGlobalLock);
/* Only use the lock if the AlwaysLock bit is set */
if (!(FieldFlags & AML_FIELD_LOCK_RULE_MASK))
{
return_VOID;
}
/* Release the global lock */
Status = AcpiExReleaseMutexObject (AcpiGbl_GlobalLockMutex);
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: AcpiExDigitsNeeded
*
* 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 UINT32
AcpiExDigitsNeeded (
UINT64 Value,
UINT32 Base)
{
UINT32 NumDigits;
UINT64 CurrentValue;
ACPI_FUNCTION_TRACE (ExDigitsNeeded);
/* UINT64 is unsigned, so we don't worry about a '-' prefix */
if (Value == 0)
{
return_UINT32 (1);
}
CurrentValue = Value;
NumDigits = 0;
/* Count the digits in the requested base */
while (CurrentValue)
{
(void) AcpiUtShortDivide (CurrentValue, Base, &CurrentValue, NULL);
NumDigits++;
}
return_UINT32 (NumDigits);
}
/*******************************************************************************
*
* FUNCTION: AcpiExEisaIdToString
*
* PARAMETERS: CompressedId - EISAID to be converted
* OutString - 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
AcpiExEisaIdToString (
char *OutString,
UINT64 CompressedId)
{
UINT32 SwappedId;
ACPI_FUNCTION_ENTRY ();
/* The EISAID should be a 32-bit integer */
if (CompressedId > ACPI_UINT32_MAX)
{
ACPI_WARNING ((AE_INFO,
"Expected EISAID is larger than 32 bits: 0x%8.8X%8.8X, truncating",
ACPI_FORMAT_UINT64 (CompressedId)));
}
/* Swap ID to big-endian to get contiguous bits */
SwappedId = AcpiUtDwordByteSwap ((UINT32) CompressedId);
/* First 3 bytes are uppercase letters. Next 4 bytes are hexadecimal */
OutString[0] = (char) (0x40 + (((unsigned long) SwappedId >> 26) & 0x1F));
OutString[1] = (char) (0x40 + ((SwappedId >> 21) & 0x1F));
OutString[2] = (char) (0x40 + ((SwappedId >> 16) & 0x1F));
OutString[3] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 12);
OutString[4] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 8);
OutString[5] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 4);
OutString[6] = AcpiUtHexToAsciiChar ((UINT64) SwappedId, 0);
OutString[7] = 0;
}
/*******************************************************************************
*
* FUNCTION: AcpiExIntegerToString
*
* PARAMETERS: OutString - 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
AcpiExIntegerToString (
char *OutString,
UINT64 Value)
{
UINT32 Count;
UINT32 DigitsNeeded;
UINT32 Remainder;
ACPI_FUNCTION_ENTRY ();
DigitsNeeded = AcpiExDigitsNeeded (Value, 10);
OutString[DigitsNeeded] = 0;
for (Count = DigitsNeeded; Count > 0; Count--)
{
(void) AcpiUtShortDivide (Value, 10, &Value, &Remainder);
OutString[Count-1] = (char) ('0' + Remainder);\
}
}
#endif