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minix/drivers/acpi/executer/exutils.c
Tomas Hruby 9560b6dea8 ACPI driver 
- 99% of the code is Intel's ACPICA. The license is compliant with BSD
  and GNU and virtually all systems that use ACPI use this code, For
  instance it is part of the Linux kernel.

- The only minix specific files are

  acpi.c
  osminixxf.c
  platform/acminix.h

  and

  include/minix/acpi.h

- At the moment the driver does not register interrupt hooks which I
  believe is mainly for handling PnP, events like "battery level is
  low" and power management. Should not be difficult to add it if need
  be.

- The interface to the outside world is virtually non-existent except
  a trivial message based service for PCI driver to query which device
  is connected to what IRQ line. This will evolve as more components
  start using this driver. VM, Scheduler and IOMMU are the possible
  users right now.

- because of dependency on a native 64bit (long long, part of c99) it
  is compiled only with a gnu-like compilers which in case of Minix
  includes gcc llvm-gcc and clang
2010-09-02 15:44:04 +00:00

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/******************************************************************************
*
* Module Name: exutils - interpreter/scanner utilities
*
*****************************************************************************/
/******************************************************************************
*
* 1. Copyright Notice
*
* Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
* All rights reserved.
*
* 2. License
*
* 2.1. This is your license from Intel Corp. under its intellectual property
* rights. You may have additional license terms from the party that provided
* you this software, covering your right to use that party's intellectual
* property rights.
*
* 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
* copy of the source code appearing in this file ("Covered Code") an
* irrevocable, perpetual, worldwide license under Intel's copyrights in the
* base code distributed originally by Intel ("Original Intel Code") to copy,
* make derivatives, distribute, use and display any portion of the Covered
* Code in any form, with the right to sublicense such rights; and
*
* 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
* license (with the right to sublicense), under only those claims of Intel
* patents that are infringed by the Original Intel Code, to make, use, sell,
* offer to sell, and import the Covered Code and derivative works thereof
* solely to the minimum extent necessary to exercise the above copyright
* license, and in no event shall the patent license extend to any additions
* to or modifications of the Original Intel Code. No other license or right
* is granted directly or by implication, estoppel or otherwise;
*
* The above copyright and patent license is granted only if the following
* conditions are met:
*
* 3. Conditions
*
* 3.1. Redistribution of Source with Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification with rights to further distribute source must include
* the above Copyright Notice, the above License, this list of Conditions,
* and the following Disclaimer and Export Compliance provision. In addition,
* Licensee must cause all Covered Code to which Licensee contributes to
* contain a file documenting the changes Licensee made to create that Covered
* Code and the date of any change. Licensee must include in that file the
* documentation of any changes made by any predecessor Licensee. Licensee
* must include a prominent statement that the modification is derived,
* directly or indirectly, from Original Intel Code.
*
* 3.2. Redistribution of Source with no Rights to Further Distribute Source.
* Redistribution of source code of any substantial portion of the Covered
* Code or modification without rights to further distribute source must
* include the following Disclaimer and Export Compliance provision in the
* documentation and/or other materials provided with distribution. In
* addition, Licensee may not authorize further sublicense of source of any
* portion of the Covered Code, and must include terms to the effect that the
* license from Licensee to its licensee is limited to the intellectual
* property embodied in the software Licensee provides to its licensee, and
* not to intellectual property embodied in modifications its licensee may
* make.
*
* 3.3. Redistribution of Executable. Redistribution in executable form of any
* substantial portion of the Covered Code or modification must reproduce the
* above Copyright Notice, and the following Disclaimer and Export Compliance
* provision in the documentation and/or other materials provided with the
* distribution.
*
* 3.4. Intel retains all right, title, and interest in and to the Original
* Intel Code.
*
* 3.5. Neither the name Intel nor any other trademark owned or controlled by
* Intel shall be used in advertising or otherwise to promote the sale, use or
* other dealings in products derived from or relating to the Covered Code
* without prior written authorization from Intel.
*
* 4. Disclaimer and Export Compliance
*
* 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
* HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
* IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
* INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
* UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
* IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
* OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
* COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
* SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
* CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
* HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
* SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
* LIMITED REMEDY.
*
* 4.3. Licensee shall not export, either directly or indirectly, any of this
* software or system incorporating such software without first obtaining any
* required license or other approval from the U. S. Department of Commerce or
* any other agency or department of the United States Government. In the
* event Licensee exports any such software from the United States or
* re-exports any such software from a foreign destination, Licensee shall
* ensure that the distribution and export/re-export of the software is in
* compliance with all laws, regulations, orders, or other restrictions of the
* U.S. Export Administration Regulations. Licensee agrees that neither it nor
* any of its subsidiaries will export/re-export any technical data, process,
* software, or service, directly or indirectly, to any country for which the
* United States government or any agency thereof requires an export license,
* other governmental approval, or letter of assurance, without first obtaining
* such license, approval or letter.
*
*****************************************************************************/
#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 "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#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
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