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utmath.c revision 1.1
      1  1.1  jruoho /*******************************************************************************
      2  1.1  jruoho  *
      3  1.1  jruoho  * Module Name: utmath - Integer math support routines
      4  1.1  jruoho  *
      5  1.1  jruoho  ******************************************************************************/
      6  1.1  jruoho 
      7  1.1  jruoho /******************************************************************************
      8  1.1  jruoho  *
      9  1.1  jruoho  * 1. Copyright Notice
     10  1.1  jruoho  *
     11  1.1  jruoho  * Some or all of this work - Copyright (c) 1999 - 2010, Intel Corp.
     12  1.1  jruoho  * All rights reserved.
     13  1.1  jruoho  *
     14  1.1  jruoho  * 2. License
     15  1.1  jruoho  *
     16  1.1  jruoho  * 2.1. This is your license from Intel Corp. under its intellectual property
     17  1.1  jruoho  * rights.  You may have additional license terms from the party that provided
     18  1.1  jruoho  * you this software, covering your right to use that party's intellectual
     19  1.1  jruoho  * property rights.
     20  1.1  jruoho  *
     21  1.1  jruoho  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
     22  1.1  jruoho  * copy of the source code appearing in this file ("Covered Code") an
     23  1.1  jruoho  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
     24  1.1  jruoho  * base code distributed originally by Intel ("Original Intel Code") to copy,
     25  1.1  jruoho  * make derivatives, distribute, use and display any portion of the Covered
     26  1.1  jruoho  * Code in any form, with the right to sublicense such rights; and
     27  1.1  jruoho  *
     28  1.1  jruoho  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
     29  1.1  jruoho  * license (with the right to sublicense), under only those claims of Intel
     30  1.1  jruoho  * patents that are infringed by the Original Intel Code, to make, use, sell,
     31  1.1  jruoho  * offer to sell, and import the Covered Code and derivative works thereof
     32  1.1  jruoho  * solely to the minimum extent necessary to exercise the above copyright
     33  1.1  jruoho  * license, and in no event shall the patent license extend to any additions
     34  1.1  jruoho  * to or modifications of the Original Intel Code.  No other license or right
     35  1.1  jruoho  * is granted directly or by implication, estoppel or otherwise;
     36  1.1  jruoho  *
     37  1.1  jruoho  * The above copyright and patent license is granted only if the following
     38  1.1  jruoho  * conditions are met:
     39  1.1  jruoho  *
     40  1.1  jruoho  * 3. Conditions
     41  1.1  jruoho  *
     42  1.1  jruoho  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
     43  1.1  jruoho  * Redistribution of source code of any substantial portion of the Covered
     44  1.1  jruoho  * Code or modification with rights to further distribute source must include
     45  1.1  jruoho  * the above Copyright Notice, the above License, this list of Conditions,
     46  1.1  jruoho  * and the following Disclaimer and Export Compliance provision.  In addition,
     47  1.1  jruoho  * Licensee must cause all Covered Code to which Licensee contributes to
     48  1.1  jruoho  * contain a file documenting the changes Licensee made to create that Covered
     49  1.1  jruoho  * Code and the date of any change.  Licensee must include in that file the
     50  1.1  jruoho  * documentation of any changes made by any predecessor Licensee.  Licensee
     51  1.1  jruoho  * must include a prominent statement that the modification is derived,
     52  1.1  jruoho  * directly or indirectly, from Original Intel Code.
     53  1.1  jruoho  *
     54  1.1  jruoho  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
     55  1.1  jruoho  * Redistribution of source code of any substantial portion of the Covered
     56  1.1  jruoho  * Code or modification without rights to further distribute source must
     57  1.1  jruoho  * include the following Disclaimer and Export Compliance provision in the
     58  1.1  jruoho  * documentation and/or other materials provided with distribution.  In
     59  1.1  jruoho  * addition, Licensee may not authorize further sublicense of source of any
     60  1.1  jruoho  * portion of the Covered Code, and must include terms to the effect that the
     61  1.1  jruoho  * license from Licensee to its licensee is limited to the intellectual
     62  1.1  jruoho  * property embodied in the software Licensee provides to its licensee, and
     63  1.1  jruoho  * not to intellectual property embodied in modifications its licensee may
     64  1.1  jruoho  * make.
     65  1.1  jruoho  *
     66  1.1  jruoho  * 3.3. Redistribution of Executable. Redistribution in executable form of any
     67  1.1  jruoho  * substantial portion of the Covered Code or modification must reproduce the
     68  1.1  jruoho  * above Copyright Notice, and the following Disclaimer and Export Compliance
     69  1.1  jruoho  * provision in the documentation and/or other materials provided with the
     70  1.1  jruoho  * distribution.
     71  1.1  jruoho  *
     72  1.1  jruoho  * 3.4. Intel retains all right, title, and interest in and to the Original
     73  1.1  jruoho  * Intel Code.
     74  1.1  jruoho  *
     75  1.1  jruoho  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
     76  1.1  jruoho  * Intel shall be used in advertising or otherwise to promote the sale, use or
     77  1.1  jruoho  * other dealings in products derived from or relating to the Covered Code
     78  1.1  jruoho  * without prior written authorization from Intel.
     79  1.1  jruoho  *
     80  1.1  jruoho  * 4. Disclaimer and Export Compliance
     81  1.1  jruoho  *
     82  1.1  jruoho  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
     83  1.1  jruoho  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
     84  1.1  jruoho  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
     85  1.1  jruoho  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
     86  1.1  jruoho  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
     87  1.1  jruoho  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
     88  1.1  jruoho  * PARTICULAR PURPOSE.
     89  1.1  jruoho  *
     90  1.1  jruoho  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
     91  1.1  jruoho  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
     92  1.1  jruoho  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
     93  1.1  jruoho  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
     94  1.1  jruoho  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
     95  1.1  jruoho  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
     96  1.1  jruoho  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
     97  1.1  jruoho  * LIMITED REMEDY.
     98  1.1  jruoho  *
     99  1.1  jruoho  * 4.3. Licensee shall not export, either directly or indirectly, any of this
    100  1.1  jruoho  * software or system incorporating such software without first obtaining any
    101  1.1  jruoho  * required license or other approval from the U. S. Department of Commerce or
    102  1.1  jruoho  * any other agency or department of the United States Government.  In the
    103  1.1  jruoho  * event Licensee exports any such software from the United States or
    104  1.1  jruoho  * re-exports any such software from a foreign destination, Licensee shall
    105  1.1  jruoho  * ensure that the distribution and export/re-export of the software is in
    106  1.1  jruoho  * compliance with all laws, regulations, orders, or other restrictions of the
    107  1.1  jruoho  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
    108  1.1  jruoho  * any of its subsidiaries will export/re-export any technical data, process,
    109  1.1  jruoho  * software, or service, directly or indirectly, to any country for which the
    110  1.1  jruoho  * United States government or any agency thereof requires an export license,
    111  1.1  jruoho  * other governmental approval, or letter of assurance, without first obtaining
    112  1.1  jruoho  * such license, approval or letter.
    113  1.1  jruoho  *
    114  1.1  jruoho  *****************************************************************************/
    115  1.1  jruoho 
    116  1.1  jruoho 
    117  1.1  jruoho #define __UTMATH_C__
    118  1.1  jruoho 
    119  1.1  jruoho #include "acpi.h"
    120  1.1  jruoho #include "accommon.h"
    121  1.1  jruoho 
    122  1.1  jruoho 
    123  1.1  jruoho #define _COMPONENT          ACPI_UTILITIES
    124  1.1  jruoho         ACPI_MODULE_NAME    ("utmath")
    125  1.1  jruoho 
    126  1.1  jruoho /*
    127  1.1  jruoho  * Support for double-precision integer divide.  This code is included here
    128  1.1  jruoho  * in order to support kernel environments where the double-precision math
    129  1.1  jruoho  * library is not available.
    130  1.1  jruoho  */
    131  1.1  jruoho 
    132  1.1  jruoho #ifndef ACPI_USE_NATIVE_DIVIDE
    133  1.1  jruoho /*******************************************************************************
    134  1.1  jruoho  *
    135  1.1  jruoho  * FUNCTION:    AcpiUtShortDivide
    136  1.1  jruoho  *
    137  1.1  jruoho  * PARAMETERS:  Dividend            - 64-bit dividend
    138  1.1  jruoho  *              Divisor             - 32-bit divisor
    139  1.1  jruoho  *              OutQuotient         - Pointer to where the quotient is returned
    140  1.1  jruoho  *              OutRemainder        - Pointer to where the remainder is returned
    141  1.1  jruoho  *
    142  1.1  jruoho  * RETURN:      Status (Checks for divide-by-zero)
    143  1.1  jruoho  *
    144  1.1  jruoho  * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits)
    145  1.1  jruoho  *              divide and modulo.  The result is a 64-bit quotient and a
    146  1.1  jruoho  *              32-bit remainder.
    147  1.1  jruoho  *
    148  1.1  jruoho  ******************************************************************************/
    149  1.1  jruoho 
    150  1.1  jruoho ACPI_STATUS
    151  1.1  jruoho AcpiUtShortDivide (
    152  1.1  jruoho     UINT64                  Dividend,
    153  1.1  jruoho     UINT32                  Divisor,
    154  1.1  jruoho     UINT64                  *OutQuotient,
    155  1.1  jruoho     UINT32                  *OutRemainder)
    156  1.1  jruoho {
    157  1.1  jruoho     UINT64_OVERLAY          DividendOvl;
    158  1.1  jruoho     UINT64_OVERLAY          Quotient;
    159  1.1  jruoho     UINT32                  Remainder32;
    160  1.1  jruoho 
    161  1.1  jruoho 
    162  1.1  jruoho     ACPI_FUNCTION_TRACE (UtShortDivide);
    163  1.1  jruoho 
    164  1.1  jruoho 
    165  1.1  jruoho     /* Always check for a zero divisor */
    166  1.1  jruoho 
    167  1.1  jruoho     if (Divisor == 0)
    168  1.1  jruoho     {
    169  1.1  jruoho         ACPI_ERROR ((AE_INFO, "Divide by zero"));
    170  1.1  jruoho         return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
    171  1.1  jruoho     }
    172  1.1  jruoho 
    173  1.1  jruoho     DividendOvl.Full = Dividend;
    174  1.1  jruoho 
    175  1.1  jruoho     /*
    176  1.1  jruoho      * The quotient is 64 bits, the remainder is always 32 bits,
    177  1.1  jruoho      * and is generated by the second divide.
    178  1.1  jruoho      */
    179  1.1  jruoho     ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor,
    180  1.1  jruoho                        Quotient.Part.Hi, Remainder32);
    181  1.1  jruoho     ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor,
    182  1.1  jruoho                        Quotient.Part.Lo, Remainder32);
    183  1.1  jruoho 
    184  1.1  jruoho     /* Return only what was requested */
    185  1.1  jruoho 
    186  1.1  jruoho     if (OutQuotient)
    187  1.1  jruoho     {
    188  1.1  jruoho         *OutQuotient = Quotient.Full;
    189  1.1  jruoho     }
    190  1.1  jruoho     if (OutRemainder)
    191  1.1  jruoho     {
    192  1.1  jruoho         *OutRemainder = Remainder32;
    193  1.1  jruoho     }
    194  1.1  jruoho 
    195  1.1  jruoho     return_ACPI_STATUS (AE_OK);
    196  1.1  jruoho }
    197  1.1  jruoho 
    198  1.1  jruoho 
    199  1.1  jruoho /*******************************************************************************
    200  1.1  jruoho  *
    201  1.1  jruoho  * FUNCTION:    AcpiUtDivide
    202  1.1  jruoho  *
    203  1.1  jruoho  * PARAMETERS:  InDividend          - Dividend
    204  1.1  jruoho  *              InDivisor           - Divisor
    205  1.1  jruoho  *              OutQuotient         - Pointer to where the quotient is returned
    206  1.1  jruoho  *              OutRemainder        - Pointer to where the remainder is returned
    207  1.1  jruoho  *
    208  1.1  jruoho  * RETURN:      Status (Checks for divide-by-zero)
    209  1.1  jruoho  *
    210  1.1  jruoho  * DESCRIPTION: Perform a divide and modulo.
    211  1.1  jruoho  *
    212  1.1  jruoho  ******************************************************************************/
    213  1.1  jruoho 
    214  1.1  jruoho ACPI_STATUS
    215  1.1  jruoho AcpiUtDivide (
    216  1.1  jruoho     UINT64                  InDividend,
    217  1.1  jruoho     UINT64                  InDivisor,
    218  1.1  jruoho     UINT64                  *OutQuotient,
    219  1.1  jruoho     UINT64                  *OutRemainder)
    220  1.1  jruoho {
    221  1.1  jruoho     UINT64_OVERLAY          Dividend;
    222  1.1  jruoho     UINT64_OVERLAY          Divisor;
    223  1.1  jruoho     UINT64_OVERLAY          Quotient;
    224  1.1  jruoho     UINT64_OVERLAY          Remainder;
    225  1.1  jruoho     UINT64_OVERLAY          NormalizedDividend;
    226  1.1  jruoho     UINT64_OVERLAY          NormalizedDivisor;
    227  1.1  jruoho     UINT32                  Partial1;
    228  1.1  jruoho     UINT64_OVERLAY          Partial2;
    229  1.1  jruoho     UINT64_OVERLAY          Partial3;
    230  1.1  jruoho 
    231  1.1  jruoho 
    232  1.1  jruoho     ACPI_FUNCTION_TRACE (UtDivide);
    233  1.1  jruoho 
    234  1.1  jruoho 
    235  1.1  jruoho     /* Always check for a zero divisor */
    236  1.1  jruoho 
    237  1.1  jruoho     if (InDivisor == 0)
    238  1.1  jruoho     {
    239  1.1  jruoho         ACPI_ERROR ((AE_INFO, "Divide by zero"));
    240  1.1  jruoho         return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
    241  1.1  jruoho     }
    242  1.1  jruoho 
    243  1.1  jruoho     Divisor.Full  = InDivisor;
    244  1.1  jruoho     Dividend.Full = InDividend;
    245  1.1  jruoho     if (Divisor.Part.Hi == 0)
    246  1.1  jruoho     {
    247  1.1  jruoho         /*
    248  1.1  jruoho          * 1) Simplest case is where the divisor is 32 bits, we can
    249  1.1  jruoho          * just do two divides
    250  1.1  jruoho          */
    251  1.1  jruoho         Remainder.Part.Hi = 0;
    252  1.1  jruoho 
    253  1.1  jruoho         /*
    254  1.1  jruoho          * The quotient is 64 bits, the remainder is always 32 bits,
    255  1.1  jruoho          * and is generated by the second divide.
    256  1.1  jruoho          */
    257  1.1  jruoho         ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo,
    258  1.1  jruoho                            Quotient.Part.Hi, Partial1);
    259  1.1  jruoho         ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo,
    260  1.1  jruoho                            Quotient.Part.Lo, Remainder.Part.Lo);
    261  1.1  jruoho     }
    262  1.1  jruoho 
    263  1.1  jruoho     else
    264  1.1  jruoho     {
    265  1.1  jruoho         /*
    266  1.1  jruoho          * 2) The general case where the divisor is a full 64 bits
    267  1.1  jruoho          * is more difficult
    268  1.1  jruoho          */
    269  1.1  jruoho         Quotient.Part.Hi   = 0;
    270  1.1  jruoho         NormalizedDividend = Dividend;
    271  1.1  jruoho         NormalizedDivisor  = Divisor;
    272  1.1  jruoho 
    273  1.1  jruoho         /* Normalize the operands (shift until the divisor is < 32 bits) */
    274  1.1  jruoho 
    275  1.1  jruoho         do
    276  1.1  jruoho         {
    277  1.1  jruoho             ACPI_SHIFT_RIGHT_64 (NormalizedDivisor.Part.Hi,
    278  1.1  jruoho                                  NormalizedDivisor.Part.Lo);
    279  1.1  jruoho             ACPI_SHIFT_RIGHT_64 (NormalizedDividend.Part.Hi,
    280  1.1  jruoho                                  NormalizedDividend.Part.Lo);
    281  1.1  jruoho 
    282  1.1  jruoho         } while (NormalizedDivisor.Part.Hi != 0);
    283  1.1  jruoho 
    284  1.1  jruoho         /* Partial divide */
    285  1.1  jruoho 
    286  1.1  jruoho         ACPI_DIV_64_BY_32 (NormalizedDividend.Part.Hi,
    287  1.1  jruoho                            NormalizedDividend.Part.Lo,
    288  1.1  jruoho                            NormalizedDivisor.Part.Lo,
    289  1.1  jruoho                            Quotient.Part.Lo, Partial1);
    290  1.1  jruoho 
    291  1.1  jruoho         /*
    292  1.1  jruoho          * The quotient is always 32 bits, and simply requires adjustment.
    293  1.1  jruoho          * The 64-bit remainder must be generated.
    294  1.1  jruoho          */
    295  1.1  jruoho         Partial1      = Quotient.Part.Lo * Divisor.Part.Hi;
    296  1.1  jruoho         Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo;
    297  1.1  jruoho         Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1;
    298  1.1  jruoho 
    299  1.1  jruoho         Remainder.Part.Hi = Partial3.Part.Lo;
    300  1.1  jruoho         Remainder.Part.Lo = Partial2.Part.Lo;
    301  1.1  jruoho 
    302  1.1  jruoho         if (Partial3.Part.Hi == 0)
    303  1.1  jruoho         {
    304  1.1  jruoho             if (Partial3.Part.Lo >= Dividend.Part.Hi)
    305  1.1  jruoho             {
    306  1.1  jruoho                 if (Partial3.Part.Lo == Dividend.Part.Hi)
    307  1.1  jruoho                 {
    308  1.1  jruoho                     if (Partial2.Part.Lo > Dividend.Part.Lo)
    309  1.1  jruoho                     {
    310  1.1  jruoho                         Quotient.Part.Lo--;
    311  1.1  jruoho                         Remainder.Full -= Divisor.Full;
    312  1.1  jruoho                     }
    313  1.1  jruoho                 }
    314  1.1  jruoho                 else
    315  1.1  jruoho                 {
    316  1.1  jruoho                     Quotient.Part.Lo--;
    317  1.1  jruoho                     Remainder.Full -= Divisor.Full;
    318  1.1  jruoho                 }
    319  1.1  jruoho             }
    320  1.1  jruoho 
    321  1.1  jruoho             Remainder.Full    = Remainder.Full - Dividend.Full;
    322  1.1  jruoho             Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi);
    323  1.1  jruoho             Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo);
    324  1.1  jruoho 
    325  1.1  jruoho             if (Remainder.Part.Lo)
    326  1.1  jruoho             {
    327  1.1  jruoho                 Remainder.Part.Hi--;
    328  1.1  jruoho             }
    329  1.1  jruoho         }
    330  1.1  jruoho     }
    331  1.1  jruoho 
    332  1.1  jruoho     /* Return only what was requested */
    333  1.1  jruoho 
    334  1.1  jruoho     if (OutQuotient)
    335  1.1  jruoho     {
    336  1.1  jruoho         *OutQuotient = Quotient.Full;
    337  1.1  jruoho     }
    338  1.1  jruoho     if (OutRemainder)
    339  1.1  jruoho     {
    340  1.1  jruoho         *OutRemainder = Remainder.Full;
    341  1.1  jruoho     }
    342  1.1  jruoho 
    343  1.1  jruoho     return_ACPI_STATUS (AE_OK);
    344  1.1  jruoho }
    345  1.1  jruoho 
    346  1.1  jruoho #else
    347  1.1  jruoho 
    348  1.1  jruoho /*******************************************************************************
    349  1.1  jruoho  *
    350  1.1  jruoho  * FUNCTION:    AcpiUtShortDivide, AcpiUtDivide
    351  1.1  jruoho  *
    352  1.1  jruoho  * PARAMETERS:  See function headers above
    353  1.1  jruoho  *
    354  1.1  jruoho  * DESCRIPTION: Native versions of the UtDivide functions. Use these if either
    355  1.1  jruoho  *              1) The target is a 64-bit platform and therefore 64-bit
    356  1.1  jruoho  *                 integer math is supported directly by the machine.
    357  1.1  jruoho  *              2) The target is a 32-bit or 16-bit platform, and the
    358  1.1  jruoho  *                 double-precision integer math library is available to
    359  1.1  jruoho  *                 perform the divide.
    360  1.1  jruoho  *
    361  1.1  jruoho  ******************************************************************************/
    362  1.1  jruoho 
    363  1.1  jruoho ACPI_STATUS
    364  1.1  jruoho AcpiUtShortDivide (
    365  1.1  jruoho     UINT64                  InDividend,
    366  1.1  jruoho     UINT32                  Divisor,
    367  1.1  jruoho     UINT64                  *OutQuotient,
    368  1.1  jruoho     UINT32                  *OutRemainder)
    369  1.1  jruoho {
    370  1.1  jruoho 
    371  1.1  jruoho     ACPI_FUNCTION_TRACE (UtShortDivide);
    372  1.1  jruoho 
    373  1.1  jruoho 
    374  1.1  jruoho     /* Always check for a zero divisor */
    375  1.1  jruoho 
    376  1.1  jruoho     if (Divisor == 0)
    377  1.1  jruoho     {
    378  1.1  jruoho         ACPI_ERROR ((AE_INFO, "Divide by zero"));
    379  1.1  jruoho         return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
    380  1.1  jruoho     }
    381  1.1  jruoho 
    382  1.1  jruoho     /* Return only what was requested */
    383  1.1  jruoho 
    384  1.1  jruoho     if (OutQuotient)
    385  1.1  jruoho     {
    386  1.1  jruoho         *OutQuotient = InDividend / Divisor;
    387  1.1  jruoho     }
    388  1.1  jruoho     if (OutRemainder)
    389  1.1  jruoho     {
    390  1.1  jruoho         *OutRemainder = (UINT32) (InDividend % Divisor);
    391  1.1  jruoho     }
    392  1.1  jruoho 
    393  1.1  jruoho     return_ACPI_STATUS (AE_OK);
    394  1.1  jruoho }
    395  1.1  jruoho 
    396  1.1  jruoho ACPI_STATUS
    397  1.1  jruoho AcpiUtDivide (
    398  1.1  jruoho     UINT64                  InDividend,
    399  1.1  jruoho     UINT64                  InDivisor,
    400  1.1  jruoho     UINT64                  *OutQuotient,
    401  1.1  jruoho     UINT64                  *OutRemainder)
    402  1.1  jruoho {
    403  1.1  jruoho     ACPI_FUNCTION_TRACE (UtDivide);
    404  1.1  jruoho 
    405  1.1  jruoho 
    406  1.1  jruoho     /* Always check for a zero divisor */
    407  1.1  jruoho 
    408  1.1  jruoho     if (InDivisor == 0)
    409  1.1  jruoho     {
    410  1.1  jruoho         ACPI_ERROR ((AE_INFO, "Divide by zero"));
    411  1.1  jruoho         return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
    412  1.1  jruoho     }
    413  1.1  jruoho 
    414  1.1  jruoho 
    415  1.1  jruoho     /* Return only what was requested */
    416  1.1  jruoho 
    417  1.1  jruoho     if (OutQuotient)
    418  1.1  jruoho     {
    419  1.1  jruoho         *OutQuotient = InDividend / InDivisor;
    420  1.1  jruoho     }
    421  1.1  jruoho     if (OutRemainder)
    422  1.1  jruoho     {
    423  1.1  jruoho         *OutRemainder = InDividend % InDivisor;
    424  1.1  jruoho     }
    425  1.1  jruoho 
    426  1.1  jruoho     return_ACPI_STATUS (AE_OK);
    427  1.1  jruoho }
    428  1.1  jruoho 
    429  1.1  jruoho #endif
    430  1.1  jruoho 
    431  1.1  jruoho 
    432