429 lines
15 KiB
C
429 lines
15 KiB
C
/*******************************************************************************
|
|
*
|
|
* Module Name: utmath - Integer math support routines
|
|
* $Revision: 7 $
|
|
*
|
|
******************************************************************************/
|
|
|
|
/******************************************************************************
|
|
*
|
|
* 1. Copyright Notice
|
|
*
|
|
* Some or all of this work - Copyright (c) 1999, 2000, 2001, 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 __UTMATH_C__
|
|
|
|
#include "acpi.h"
|
|
|
|
|
|
#define _COMPONENT ACPI_UTILITIES
|
|
MODULE_NAME ("utmath")
|
|
|
|
/*
|
|
* Support for double-precision integer divide. This code is included here
|
|
* in order to support kernel environments where the double-precision math
|
|
* library is not available.
|
|
*/
|
|
|
|
#ifndef ACPI_USE_NATIVE_DIVIDE
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiUtShortDivide
|
|
*
|
|
* PARAMETERS: InDividend - Pointer to the dividend
|
|
* Divisor - 32-bit divisor
|
|
* OutQuotient - Pointer to where the quotient is returned
|
|
* OutRemainder - Pointer to where the remainder is returned
|
|
*
|
|
* RETURN: Status (Checks for divide-by-zero)
|
|
*
|
|
* DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits)
|
|
* divide and modulo. The result is a 64-bit quotient and a
|
|
* 32-bit remainder.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiUtShortDivide (
|
|
ACPI_INTEGER *InDividend,
|
|
UINT32 Divisor,
|
|
ACPI_INTEGER *OutQuotient,
|
|
UINT32 *OutRemainder)
|
|
{
|
|
UINT64_OVERLAY Dividend;
|
|
UINT64_OVERLAY Quotient;
|
|
UINT32 Remainder32;
|
|
|
|
|
|
FUNCTION_TRACE ("UtShortDivide");
|
|
|
|
Dividend.Full = *InDividend;
|
|
|
|
/* Always check for a zero divisor */
|
|
|
|
if (Divisor == 0)
|
|
{
|
|
REPORT_ERROR (("AcpiUtShortDivide: Divide by zero\n"));
|
|
return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
|
|
}
|
|
|
|
/*
|
|
* The quotient is 64 bits, the remainder is always 32 bits,
|
|
* and is generated by the second divide.
|
|
*/
|
|
ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor,
|
|
Quotient.Part.Hi, Remainder32);
|
|
ACPI_DIV_64_BY_32 (Remainder32, Dividend.Part.Lo, Divisor,
|
|
Quotient.Part.Lo, Remainder32);
|
|
|
|
/* Return only what was requested */
|
|
|
|
if (OutQuotient)
|
|
{
|
|
*OutQuotient = Quotient.Full;
|
|
}
|
|
if (OutRemainder)
|
|
{
|
|
*OutRemainder = Remainder32;
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiUtDivide
|
|
*
|
|
* PARAMETERS: InDividend - Pointer to the dividend
|
|
* InDivisor - Pointer to the divisor
|
|
* OutQuotient - Pointer to where the quotient is returned
|
|
* OutRemainder - Pointer to where the remainder is returned
|
|
*
|
|
* RETURN: Status (Checks for divide-by-zero)
|
|
*
|
|
* DESCRIPTION: Perform a divide and modulo.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiUtDivide (
|
|
ACPI_INTEGER *InDividend,
|
|
ACPI_INTEGER *InDivisor,
|
|
ACPI_INTEGER *OutQuotient,
|
|
ACPI_INTEGER *OutRemainder)
|
|
{
|
|
UINT64_OVERLAY Dividend;
|
|
UINT64_OVERLAY Divisor;
|
|
UINT64_OVERLAY Quotient;
|
|
UINT64_OVERLAY Remainder;
|
|
UINT64_OVERLAY NormalizedDividend;
|
|
UINT64_OVERLAY NormalizedDivisor;
|
|
UINT32 Partial1;
|
|
UINT64_OVERLAY Partial2;
|
|
UINT64_OVERLAY Partial3;
|
|
|
|
|
|
FUNCTION_TRACE ("UtDivide");
|
|
|
|
|
|
/* Always check for a zero divisor */
|
|
|
|
if (*InDivisor == 0)
|
|
{
|
|
REPORT_ERROR (("AcpiUtDivide: Divide by zero\n"));
|
|
return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
|
|
}
|
|
|
|
Divisor.Full = *InDivisor;
|
|
Dividend.Full = *InDividend;
|
|
if (Divisor.Part.Hi == 0)
|
|
{
|
|
/*
|
|
* 1) Simplest case is where the divisor is 32 bits, we can
|
|
* just do two divides
|
|
*/
|
|
Remainder.Part.Hi = 0;
|
|
|
|
/*
|
|
* The quotient is 64 bits, the remainder is always 32 bits,
|
|
* and is generated by the second divide.
|
|
*/
|
|
ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo,
|
|
Quotient.Part.Hi, Partial1);
|
|
ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo,
|
|
Quotient.Part.Lo, Remainder.Part.Lo);
|
|
}
|
|
|
|
else
|
|
{
|
|
/*
|
|
* 2) The general case where the divisor is a full 64 bits
|
|
* is more difficult
|
|
*/
|
|
Quotient.Part.Hi = 0;
|
|
NormalizedDividend = Dividend;
|
|
NormalizedDivisor = Divisor;
|
|
|
|
/* Normalize the operands (shift until the divisor is < 32 bits) */
|
|
|
|
do
|
|
{
|
|
ACPI_SHIFT_RIGHT_64 (NormalizedDivisor.Part.Hi,
|
|
NormalizedDivisor.Part.Lo);
|
|
ACPI_SHIFT_RIGHT_64 (NormalizedDividend.Part.Hi,
|
|
NormalizedDividend.Part.Lo);
|
|
|
|
} while (NormalizedDivisor.Part.Hi != 0);
|
|
|
|
/* Partial divide */
|
|
|
|
ACPI_DIV_64_BY_32 (NormalizedDividend.Part.Hi,
|
|
NormalizedDividend.Part.Lo,
|
|
NormalizedDivisor.Part.Lo,
|
|
Quotient.Part.Lo, Partial1);
|
|
|
|
/*
|
|
* The quotient is always 32 bits, and simply requires adjustment.
|
|
* The 64-bit remainder must be generated.
|
|
*/
|
|
Partial1 = Quotient.Part.Lo * Divisor.Part.Hi;
|
|
Partial2.Full = (ACPI_INTEGER) Quotient.Part.Lo * Divisor.Part.Lo;
|
|
Partial3.Full = Partial2.Part.Hi + Partial1;
|
|
|
|
Remainder.Part.Hi = Partial3.Part.Lo;
|
|
Remainder.Part.Lo = Partial2.Part.Lo;
|
|
|
|
if (Partial3.Part.Hi == 0)
|
|
{
|
|
if (Partial3.Part.Lo >= Dividend.Part.Hi)
|
|
{
|
|
if (Partial3.Part.Lo == Dividend.Part.Hi)
|
|
{
|
|
if (Partial2.Part.Lo > Dividend.Part.Lo)
|
|
{
|
|
Quotient.Part.Lo--;
|
|
Remainder.Full -= Divisor.Full;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Quotient.Part.Lo--;
|
|
Remainder.Full -= Divisor.Full;
|
|
}
|
|
}
|
|
|
|
Remainder.Full = Remainder.Full - Dividend.Full;
|
|
Remainder.Part.Hi = -((INT32) Remainder.Part.Hi);
|
|
Remainder.Part.Lo = -((INT32) Remainder.Part.Lo);
|
|
|
|
if (Remainder.Part.Lo)
|
|
{
|
|
Remainder.Part.Hi--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Return only what was requested */
|
|
|
|
if (OutQuotient)
|
|
{
|
|
*OutQuotient = Quotient.Full;
|
|
}
|
|
if (OutRemainder)
|
|
{
|
|
*OutRemainder = Remainder.Full;
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
#else
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: AcpiUtShortDivide, AcpiUtDivide
|
|
*
|
|
* DESCRIPTION: Native versions of the UtDivide functions. Use these if either
|
|
* 1) The target is a 64-bit platform and therefore 64-bit
|
|
* integer math is supported directly by the machine.
|
|
* 2) The target is a 32-bit or 16-bit platform, and the
|
|
* double-precision integer math library is available to
|
|
* perform the divide.
|
|
*
|
|
******************************************************************************/
|
|
|
|
ACPI_STATUS
|
|
AcpiUtShortDivide (
|
|
ACPI_INTEGER *InDividend,
|
|
UINT32 Divisor,
|
|
ACPI_INTEGER *OutQuotient,
|
|
UINT32 *OutRemainder)
|
|
{
|
|
|
|
FUNCTION_TRACE ("UtShortDivide");
|
|
|
|
|
|
/* Always check for a zero divisor */
|
|
|
|
if (Divisor == 0)
|
|
{
|
|
REPORT_ERROR (("AcpiUtShortDivide: Divide by zero\n"));
|
|
return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
|
|
}
|
|
|
|
/* Return only what was requested */
|
|
|
|
if (OutQuotient)
|
|
{
|
|
*OutQuotient = *InDividend / Divisor;
|
|
}
|
|
if (OutRemainder)
|
|
{
|
|
*OutRemainder = (UINT32) *InDividend % Divisor;
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
ACPI_STATUS
|
|
AcpiUtDivide (
|
|
ACPI_INTEGER *InDividend,
|
|
ACPI_INTEGER *InDivisor,
|
|
ACPI_INTEGER *OutQuotient,
|
|
ACPI_INTEGER *OutRemainder)
|
|
{
|
|
FUNCTION_TRACE ("UtDivide");
|
|
|
|
|
|
/* Always check for a zero divisor */
|
|
|
|
if (*InDivisor == 0)
|
|
{
|
|
REPORT_ERROR (("AcpiUtDivide: Divide by zero\n"));
|
|
return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
|
|
}
|
|
|
|
|
|
/* Return only what was requested */
|
|
|
|
if (OutQuotient)
|
|
{
|
|
*OutQuotient = *InDividend / *InDivisor;
|
|
}
|
|
if (OutRemainder)
|
|
{
|
|
*OutRemainder = *InDividend % *InDivisor;
|
|
}
|
|
|
|
return_ACPI_STATUS (AE_OK);
|
|
}
|
|
|
|
#endif
|
|
|
|
|