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minix/drivers/acpi/executer/exconvrt.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: exconvrt - Object conversion routines
*
*****************************************************************************/
/******************************************************************************
*
* 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 __EXCONVRT_C__
#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exconvrt")
/* Local prototypes */
static UINT32
AcpiExConvertToAscii (
UINT64 Integer,
UINT16 Base,
UINT8 *String,
UINT8 MaxLength);
/*******************************************************************************
*
* FUNCTION: AcpiExConvertToInteger
*
* PARAMETERS: ObjDesc - Object to be converted. Must be an
* Integer, Buffer, or String
* ResultDesc - Where the new Integer object is returned
* Flags - Used for string conversion
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to an integer.
*
******************************************************************************/
ACPI_STATUS
AcpiExConvertToInteger (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc,
UINT32 Flags)
{
ACPI_OPERAND_OBJECT *ReturnDesc;
UINT8 *Pointer;
UINT64 Result;
UINT32 i;
UINT32 Count;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR (ExConvertToInteger, ObjDesc);
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_INTEGER:
/* No conversion necessary */
*ResultDesc = ObjDesc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_BUFFER:
case ACPI_TYPE_STRING:
/* Note: Takes advantage of common buffer/string fields */
Pointer = ObjDesc->Buffer.Pointer;
Count = ObjDesc->Buffer.Length;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/*
* Convert the buffer/string to an integer. Note that both buffers and
* strings are treated as raw data - we don't convert ascii to hex for
* strings.
*
* There are two terminating conditions for the loop:
* 1) The size of an integer has been reached, or
* 2) The end of the buffer or string has been reached
*/
Result = 0;
/* String conversion is different than Buffer conversion */
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_STRING:
/*
* Convert string to an integer - for most cases, the string must be
* hexadecimal as per the ACPI specification. The only exception (as
* of ACPI 3.0) is that the ToInteger() operator allows both decimal
* and hexadecimal strings (hex prefixed with "0x").
*/
Status = AcpiUtStrtoul64 ((char *) Pointer, Flags, &Result);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
break;
case ACPI_TYPE_BUFFER:
/* Check for zero-length buffer */
if (!Count)
{
return_ACPI_STATUS (AE_AML_BUFFER_LIMIT);
}
/* Transfer no more than an integer's worth of data */
if (Count > AcpiGbl_IntegerByteWidth)
{
Count = AcpiGbl_IntegerByteWidth;
}
/*
* Convert buffer to an integer - we simply grab enough raw data
* from the buffer to fill an integer
*/
for (i = 0; i < Count; i++)
{
/*
* Get next byte and shift it into the Result.
* Little endian is used, meaning that the first byte of the buffer
* is the LSB of the integer
*/
Result |= (((UINT64) Pointer[i]) << (i * 8));
}
break;
default:
/* No other types can get here */
break;
}
/* Create a new integer */
ReturnDesc = AcpiUtCreateIntegerObject (Result);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "Converted value: %8.8X%8.8X\n",
ACPI_FORMAT_UINT64 (Result)));
/* Save the Result */
AcpiExTruncateFor32bitTable (ReturnDesc);
*ResultDesc = ReturnDesc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExConvertToBuffer
*
* PARAMETERS: ObjDesc - Object to be converted. Must be an
* Integer, Buffer, or String
* ResultDesc - Where the new buffer object is returned
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to a Buffer
*
******************************************************************************/
ACPI_STATUS
AcpiExConvertToBuffer (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc)
{
ACPI_OPERAND_OBJECT *ReturnDesc;
UINT8 *NewBuf;
ACPI_FUNCTION_TRACE_PTR (ExConvertToBuffer, ObjDesc);
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_BUFFER:
/* No conversion necessary */
*ResultDesc = ObjDesc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_INTEGER:
/*
* Create a new Buffer object.
* Need enough space for one integer
*/
ReturnDesc = AcpiUtCreateBufferObject (AcpiGbl_IntegerByteWidth);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the integer to the buffer, LSB first */
NewBuf = ReturnDesc->Buffer.Pointer;
ACPI_MEMCPY (NewBuf,
&ObjDesc->Integer.Value,
AcpiGbl_IntegerByteWidth);
break;
case ACPI_TYPE_STRING:
/*
* Create a new Buffer object
* Size will be the string length
*
* NOTE: Add one to the string length to include the null terminator.
* The ACPI spec is unclear on this subject, but there is existing
* ASL/AML code that depends on the null being transferred to the new
* buffer.
*/
ReturnDesc = AcpiUtCreateBufferObject (
(ACPI_SIZE) ObjDesc->String.Length + 1);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Copy the string to the buffer */
NewBuf = ReturnDesc->Buffer.Pointer;
ACPI_STRNCPY ((char *) NewBuf, (char *) ObjDesc->String.Pointer,
ObjDesc->String.Length);
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
/* Mark buffer initialized */
ReturnDesc->Common.Flags |= AOPOBJ_DATA_VALID;
*ResultDesc = ReturnDesc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExConvertToAscii
*
* PARAMETERS: Integer - Value to be converted
* Base - ACPI_STRING_DECIMAL or ACPI_STRING_HEX
* String - Where the string is returned
* DataWidth - Size of data item to be converted, in bytes
*
* RETURN: Actual string length
*
* DESCRIPTION: Convert an ACPI Integer to a hex or decimal string
*
******************************************************************************/
static UINT32
AcpiExConvertToAscii (
UINT64 Integer,
UINT16 Base,
UINT8 *String,
UINT8 DataWidth)
{
UINT64 Digit;
UINT32 i;
UINT32 j;
UINT32 k = 0;
UINT32 HexLength;
UINT32 DecimalLength;
UINT32 Remainder;
BOOLEAN SupressZeros;
ACPI_FUNCTION_ENTRY ();
switch (Base)
{
case 10:
/* Setup max length for the decimal number */
switch (DataWidth)
{
case 1:
DecimalLength = ACPI_MAX8_DECIMAL_DIGITS;
break;
case 4:
DecimalLength = ACPI_MAX32_DECIMAL_DIGITS;
break;
case 8:
default:
DecimalLength = ACPI_MAX64_DECIMAL_DIGITS;
break;
}
SupressZeros = TRUE; /* No leading zeros */
Remainder = 0;
for (i = DecimalLength; i > 0; i--)
{
/* Divide by nth factor of 10 */
Digit = Integer;
for (j = 0; j < i; j++)
{
(void) AcpiUtShortDivide (Digit, 10, &Digit, &Remainder);
}
/* Handle leading zeros */
if (Remainder != 0)
{
SupressZeros = FALSE;
}
if (!SupressZeros)
{
String[k] = (UINT8) (ACPI_ASCII_ZERO + Remainder);
k++;
}
}
break;
case 16:
/* HexLength: 2 ascii hex chars per data byte */
HexLength = ACPI_MUL_2 (DataWidth);
for (i = 0, j = (HexLength-1); i < HexLength; i++, j--)
{
/* Get one hex digit, most significant digits first */
String[k] = (UINT8) AcpiUtHexToAsciiChar (Integer, ACPI_MUL_4 (j));
k++;
}
break;
default:
return (0);
}
/*
* Since leading zeros are suppressed, we must check for the case where
* the integer equals 0
*
* Finally, null terminate the string and return the length
*/
if (!k)
{
String [0] = ACPI_ASCII_ZERO;
k = 1;
}
String [k] = 0;
return ((UINT32) k);
}
/*******************************************************************************
*
* FUNCTION: AcpiExConvertToString
*
* PARAMETERS: ObjDesc - Object to be converted. Must be an
* Integer, Buffer, or String
* ResultDesc - Where the string object is returned
* Type - String flags (base and conversion type)
*
* RETURN: Status
*
* DESCRIPTION: Convert an ACPI Object to a string
*
******************************************************************************/
ACPI_STATUS
AcpiExConvertToString (
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT **ResultDesc,
UINT32 Type)
{
ACPI_OPERAND_OBJECT *ReturnDesc;
UINT8 *NewBuf;
UINT32 i;
UINT32 StringLength = 0;
UINT16 Base = 16;
UINT8 Separator = ',';
ACPI_FUNCTION_TRACE_PTR (ExConvertToString, ObjDesc);
switch (ObjDesc->Common.Type)
{
case ACPI_TYPE_STRING:
/* No conversion necessary */
*ResultDesc = ObjDesc;
return_ACPI_STATUS (AE_OK);
case ACPI_TYPE_INTEGER:
switch (Type)
{
case ACPI_EXPLICIT_CONVERT_DECIMAL:
/* Make room for maximum decimal number */
StringLength = ACPI_MAX_DECIMAL_DIGITS;
Base = 10;
break;
default:
/* Two hex string characters for each integer byte */
StringLength = ACPI_MUL_2 (AcpiGbl_IntegerByteWidth);
break;
}
/*
* Create a new String
* Need enough space for one ASCII integer (plus null terminator)
*/
ReturnDesc = AcpiUtCreateStringObject ((ACPI_SIZE) StringLength);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
NewBuf = ReturnDesc->Buffer.Pointer;
/* Convert integer to string */
StringLength = AcpiExConvertToAscii (ObjDesc->Integer.Value, Base,
NewBuf, AcpiGbl_IntegerByteWidth);
/* Null terminate at the correct place */
ReturnDesc->String.Length = StringLength;
NewBuf [StringLength] = 0;
break;
case ACPI_TYPE_BUFFER:
/* Setup string length, base, and separator */
switch (Type)
{
case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by ToDecimalString */
/*
* From ACPI: "If Data is a buffer, it is converted to a string of
* decimal values separated by commas."
*/
Base = 10;
/*
* Calculate the final string length. Individual string values
* are variable length (include separator for each)
*/
for (i = 0; i < ObjDesc->Buffer.Length; i++)
{
if (ObjDesc->Buffer.Pointer[i] >= 100)
{
StringLength += 4;
}
else if (ObjDesc->Buffer.Pointer[i] >= 10)
{
StringLength += 3;
}
else
{
StringLength += 2;
}
}
break;
case ACPI_IMPLICIT_CONVERT_HEX:
/*
* From the ACPI spec:
*"The entire contents of the buffer are converted to a string of
* two-character hexadecimal numbers, each separated by a space."
*/
Separator = ' ';
StringLength = (ObjDesc->Buffer.Length * 3);
break;
case ACPI_EXPLICIT_CONVERT_HEX: /* Used by ToHexString */
/*
* From ACPI: "If Data is a buffer, it is converted to a string of
* hexadecimal values separated by commas."
*/
StringLength = (ObjDesc->Buffer.Length * 3);
break;
default:
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Create a new string object and string buffer
* (-1 because of extra separator included in StringLength from above)
* Allow creation of zero-length strings from zero-length buffers.
*/
if (StringLength)
{
StringLength--;
}
ReturnDesc = AcpiUtCreateStringObject ((ACPI_SIZE) StringLength);
if (!ReturnDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
NewBuf = ReturnDesc->Buffer.Pointer;
/*
* Convert buffer bytes to hex or decimal values
* (separated by commas or spaces)
*/
for (i = 0; i < ObjDesc->Buffer.Length; i++)
{
NewBuf += AcpiExConvertToAscii (
(UINT64) ObjDesc->Buffer.Pointer[i], Base,
NewBuf, 1);
*NewBuf++ = Separator; /* each separated by a comma or space */
}
/*
* Null terminate the string
* (overwrites final comma/space from above)
*/
if (ObjDesc->Buffer.Length)
{
NewBuf--;
}
*NewBuf = 0;
break;
default:
return_ACPI_STATUS (AE_TYPE);
}
*ResultDesc = ReturnDesc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiExConvertToTargetType
*
* PARAMETERS: DestinationType - Current type of the destination
* SourceDesc - Source object to be converted.
* ResultDesc - Where the converted object is returned
* WalkState - Current method state
*
* RETURN: Status
*
* DESCRIPTION: Implements "implicit conversion" rules for storing an object.
*
******************************************************************************/
ACPI_STATUS
AcpiExConvertToTargetType (
ACPI_OBJECT_TYPE DestinationType,
ACPI_OPERAND_OBJECT *SourceDesc,
ACPI_OPERAND_OBJECT **ResultDesc,
ACPI_WALK_STATE *WalkState)
{
ACPI_STATUS Status = AE_OK;
ACPI_FUNCTION_TRACE (ExConvertToTargetType);
/* Default behavior */
*ResultDesc = SourceDesc;
/*
* If required by the target,
* perform implicit conversion on the source before we store it.
*/
switch (GET_CURRENT_ARG_TYPE (WalkState->OpInfo->RuntimeArgs))
{
case ARGI_SIMPLE_TARGET:
case ARGI_FIXED_TARGET:
case ARGI_INTEGER_REF: /* Handles Increment, Decrement cases */
switch (DestinationType)
{
case ACPI_TYPE_LOCAL_REGION_FIELD:
/*
* Named field can always handle conversions
*/
break;
default:
/* No conversion allowed for these types */
if (DestinationType != SourceDesc->Common.Type)
{
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Explicit operator, will store (%s) over existing type (%s)\n",
AcpiUtGetObjectTypeName (SourceDesc),
AcpiUtGetTypeName (DestinationType)));
Status = AE_TYPE;
}
}
break;
case ARGI_TARGETREF:
switch (DestinationType)
{
case ACPI_TYPE_INTEGER:
case ACPI_TYPE_BUFFER_FIELD:
case ACPI_TYPE_LOCAL_BANK_FIELD:
case ACPI_TYPE_LOCAL_INDEX_FIELD:
/*
* These types require an Integer operand. We can convert
* a Buffer or a String to an Integer if necessary.
*/
Status = AcpiExConvertToInteger (SourceDesc, ResultDesc,
16);
break;
case ACPI_TYPE_STRING:
/*
* The operand must be a String. We can convert an
* Integer or Buffer if necessary
*/
Status = AcpiExConvertToString (SourceDesc, ResultDesc,
ACPI_IMPLICIT_CONVERT_HEX);
break;
case ACPI_TYPE_BUFFER:
/*
* The operand must be a Buffer. We can convert an
* Integer or String if necessary
*/
Status = AcpiExConvertToBuffer (SourceDesc, ResultDesc);
break;
default:
ACPI_ERROR ((AE_INFO, "Bad destination type during conversion: 0x%X",
DestinationType));
Status = AE_AML_INTERNAL;
break;
}
break;
case ARGI_REFERENCE:
/*
* CreateXxxxField cases - we are storing the field object into the name
*/
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown Target type ID 0x%X AmlOpcode 0x%X DestType %s",
GET_CURRENT_ARG_TYPE (WalkState->OpInfo->RuntimeArgs),
WalkState->Opcode, AcpiUtGetTypeName (DestinationType)));
Status = AE_AML_INTERNAL;
}
/*
* Source-to-Target conversion semantics:
*
* If conversion to the target type cannot be performed, then simply
* overwrite the target with the new object and type.
*/
if (Status == AE_TYPE)
{
Status = AE_OK;
}
return_ACPI_STATUS (Status);
}
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