1/*******************************************************************************
2 *
3 * Module Name: utmath - Integer math support routines
4 *
5 ******************************************************************************/
6
7/******************************************************************************
8 *
9 * 1. Copyright Notice
10 *
11 * Some or all of this work - Copyright (c) 1999 - 2023, Intel Corp.
12 * All rights reserved.
13 *
14 * 2. License
15 *
16 * 2.1. This is your license from Intel Corp. under its intellectual property
17 * rights. You may have additional license terms from the party that provided
18 * you this software, covering your right to use that party's intellectual
19 * property rights.
20 *
21 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
22 * copy of the source code appearing in this file ("Covered Code") an
23 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
24 * base code distributed originally by Intel ("Original Intel Code") to copy,
25 * make derivatives, distribute, use and display any portion of the Covered
26 * Code in any form, with the right to sublicense such rights; and
27 *
28 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
29 * license (with the right to sublicense), under only those claims of Intel
30 * patents that are infringed by the Original Intel Code, to make, use, sell,
31 * offer to sell, and import the Covered Code and derivative works thereof
32 * solely to the minimum extent necessary to exercise the above copyright
33 * license, and in no event shall the patent license extend to any additions
34 * to or modifications of the Original Intel Code. No other license or right
35 * is granted directly or by implication, estoppel or otherwise;
36 *
37 * The above copyright and patent license is granted only if the following
38 * conditions are met:
39 *
40 * 3. Conditions
41 *
42 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
43 * Redistribution of source code of any substantial portion of the Covered
44 * Code or modification with rights to further distribute source must include
45 * the above Copyright Notice, the above License, this list of Conditions,
46 * and the following Disclaimer and Export Compliance provision. In addition,
47 * Licensee must cause all Covered Code to which Licensee contributes to
48 * contain a file documenting the changes Licensee made to create that Covered
49 * Code and the date of any change. Licensee must include in that file the
50 * documentation of any changes made by any predecessor Licensee. Licensee
51 * must include a prominent statement that the modification is derived,
52 * directly or indirectly, from Original Intel Code.
53 *
54 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
55 * Redistribution of source code of any substantial portion of the Covered
56 * Code or modification without rights to further distribute source must
57 * include the following Disclaimer and Export Compliance provision in the
58 * documentation and/or other materials provided with distribution. In
59 * addition, Licensee may not authorize further sublicense of source of any
60 * portion of the Covered Code, and must include terms to the effect that the
61 * license from Licensee to its licensee is limited to the intellectual
62 * property embodied in the software Licensee provides to its licensee, and
63 * not to intellectual property embodied in modifications its licensee may
64 * make.
65 *
66 * 3.3. Redistribution of Executable. Redistribution in executable form of any
67 * substantial portion of the Covered Code or modification must reproduce the
68 * above Copyright Notice, and the following Disclaimer and Export Compliance
69 * provision in the documentation and/or other materials provided with the
70 * distribution.
71 *
72 * 3.4. Intel retains all right, title, and interest in and to the Original
73 * Intel Code.
74 *
75 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
76 * Intel shall be used in advertising or otherwise to promote the sale, use or
77 * other dealings in products derived from or relating to the Covered Code
78 * without prior written authorization from Intel.
79 *
80 * 4. Disclaimer and Export Compliance
81 *
82 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
83 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
84 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
85 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
86 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
87 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
88 * PARTICULAR PURPOSE.
89 *
90 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
91 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
92 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
93 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
94 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
95 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
96 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
97 * LIMITED REMEDY.
98 *
99 * 4.3. Licensee shall not export, either directly or indirectly, any of this
100 * software or system incorporating such software without first obtaining any
101 * required license or other approval from the U. S. Department of Commerce or
102 * any other agency or department of the United States Government. In the
103 * event Licensee exports any such software from the United States or
104 * re-exports any such software from a foreign destination, Licensee shall
105 * ensure that the distribution and export/re-export of the software is in
106 * compliance with all laws, regulations, orders, or other restrictions of the
107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
108 * any of its subsidiaries will export/re-export any technical data, process,
109 * software, or service, directly or indirectly, to any country for which the
110 * United States government or any agency thereof requires an export license,
111 * other governmental approval, or letter of assurance, without first obtaining
112 * such license, approval or letter.
113 *
114 *****************************************************************************
115 *
116 * Alternatively, you may choose to be licensed under the terms of the
117 * following license:
118 *
119 * Redistribution and use in source and binary forms, with or without
120 * modification, are permitted provided that the following conditions
121 * are met:
122 * 1. Redistributions of source code must retain the above copyright
123 *    notice, this list of conditions, and the following disclaimer,
124 *    without modification.
125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
126 *    substantially similar to the "NO WARRANTY" disclaimer below
127 *    ("Disclaimer") and any redistribution must be conditioned upon
128 *    including a substantially similar Disclaimer requirement for further
129 *    binary redistribution.
130 * 3. Neither the names of the above-listed copyright holders nor the names
131 *    of any contributors may be used to endorse or promote products derived
132 *    from this software without specific prior written permission.
133 *
134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
145 *
146 * Alternatively, you may choose to be licensed under the terms of the
147 * GNU General Public License ("GPL") version 2 as published by the Free
148 * Software Foundation.
149 *
150 *****************************************************************************/
151
152#include "acpi.h"
153#include "accommon.h"
154
155
156#define _COMPONENT          ACPI_UTILITIES
157        ACPI_MODULE_NAME    ("utmath")
158
159/* Structures used only for 64-bit divide */
160
161typedef struct uint64_struct
162{
163    UINT32                          Lo;
164    UINT32                          Hi;
165
166} UINT64_STRUCT;
167
168typedef union uint64_overlay
169{
170    UINT64                          Full;
171    UINT64_STRUCT                   Part;
172
173} UINT64_OVERLAY;
174
175/*
176 * Optional support for 64-bit double-precision integer multiply and shift.
177 * This code is configurable and is implemented in order to support 32-bit
178 * kernel environments where a 64-bit double-precision math library is not
179 * available.
180 */
181#ifndef ACPI_USE_NATIVE_MATH64
182
183/*******************************************************************************
184 *
185 * FUNCTION:    AcpiUtShortMultiply
186 *
187 * PARAMETERS:  Multiplicand        - 64-bit multiplicand
188 *              Multiplier          - 32-bit multiplier
189 *              OutProduct          - Pointer to where the product is returned
190 *
191 * DESCRIPTION: Perform a short multiply.
192 *
193 ******************************************************************************/
194
195ACPI_STATUS
196AcpiUtShortMultiply (
197    UINT64                  Multiplicand,
198    UINT32                  Multiplier,
199    UINT64                  *OutProduct)
200{
201    UINT64_OVERLAY          MultiplicandOvl;
202    UINT64_OVERLAY          Product;
203    UINT32                  Carry32;
204
205
206    ACPI_FUNCTION_TRACE (UtShortMultiply);
207
208
209    MultiplicandOvl.Full = Multiplicand;
210
211    /*
212     * The Product is 64 bits, the carry is always 32 bits,
213     * and is generated by the second multiply.
214     */
215    ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Hi, Multiplier,
216        Product.Part.Hi, Carry32);
217
218    ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Lo, Multiplier,
219        Product.Part.Lo, Carry32);
220
221    Product.Part.Hi += Carry32;
222
223    /* Return only what was requested */
224
225    if (OutProduct)
226    {
227        *OutProduct = Product.Full;
228    }
229
230    return_ACPI_STATUS (AE_OK);
231}
232
233
234/*******************************************************************************
235 *
236 * FUNCTION:    AcpiUtShortShiftLeft
237 *
238 * PARAMETERS:  Operand             - 64-bit shift operand
239 *              Count               - 32-bit shift count
240 *              OutResult           - Pointer to where the result is returned
241 *
242 * DESCRIPTION: Perform a short left shift.
243 *
244 ******************************************************************************/
245
246ACPI_STATUS
247AcpiUtShortShiftLeft (
248    UINT64                  Operand,
249    UINT32                  Count,
250    UINT64                  *OutResult)
251{
252    UINT64_OVERLAY          OperandOvl;
253
254
255    ACPI_FUNCTION_TRACE (UtShortShiftLeft);
256
257
258    OperandOvl.Full = Operand;
259
260    if ((Count & 63) >= 32)
261    {
262        OperandOvl.Part.Hi = OperandOvl.Part.Lo;
263        OperandOvl.Part.Lo = 0;
264        Count = (Count & 63) - 32;
265    }
266    ACPI_SHIFT_LEFT_64_BY_32 (OperandOvl.Part.Hi,
267        OperandOvl.Part.Lo, Count);
268
269    /* Return only what was requested */
270
271    if (OutResult)
272    {
273        *OutResult = OperandOvl.Full;
274    }
275
276    return_ACPI_STATUS (AE_OK);
277}
278
279/*******************************************************************************
280 *
281 * FUNCTION:    AcpiUtShortShiftRight
282 *
283 * PARAMETERS:  Operand             - 64-bit shift operand
284 *              Count               - 32-bit shift count
285 *              OutResult           - Pointer to where the result is returned
286 *
287 * DESCRIPTION: Perform a short right shift.
288 *
289 ******************************************************************************/
290
291ACPI_STATUS
292AcpiUtShortShiftRight (
293    UINT64                  Operand,
294    UINT32                  Count,
295    UINT64                  *OutResult)
296{
297    UINT64_OVERLAY          OperandOvl;
298
299
300    ACPI_FUNCTION_TRACE (UtShortShiftRight);
301
302
303    OperandOvl.Full = Operand;
304
305    if ((Count & 63) >= 32)
306    {
307        OperandOvl.Part.Lo = OperandOvl.Part.Hi;
308        OperandOvl.Part.Hi = 0;
309        Count = (Count & 63) - 32;
310    }
311    ACPI_SHIFT_RIGHT_64_BY_32 (OperandOvl.Part.Hi,
312        OperandOvl.Part.Lo, Count);
313
314    /* Return only what was requested */
315
316    if (OutResult)
317    {
318        *OutResult = OperandOvl.Full;
319    }
320
321    return_ACPI_STATUS (AE_OK);
322}
323#else
324
325/*******************************************************************************
326 *
327 * FUNCTION:    AcpiUtShortMultiply
328 *
329 * PARAMETERS:  See function headers above
330 *
331 * DESCRIPTION: Native version of the UtShortMultiply function.
332 *
333 ******************************************************************************/
334
335ACPI_STATUS
336AcpiUtShortMultiply (
337    UINT64                  Multiplicand,
338    UINT32                  Multiplier,
339    UINT64                  *OutProduct)
340{
341
342    ACPI_FUNCTION_TRACE (UtShortMultiply);
343
344
345    /* Return only what was requested */
346
347    if (OutProduct)
348    {
349        *OutProduct = Multiplicand * Multiplier;
350    }
351
352    return_ACPI_STATUS (AE_OK);
353}
354
355/*******************************************************************************
356 *
357 * FUNCTION:    AcpiUtShortShiftLeft
358 *
359 * PARAMETERS:  See function headers above
360 *
361 * DESCRIPTION: Native version of the UtShortShiftLeft function.
362 *
363 ******************************************************************************/
364
365ACPI_STATUS
366AcpiUtShortShiftLeft (
367    UINT64                  Operand,
368    UINT32                  Count,
369    UINT64                  *OutResult)
370{
371
372    ACPI_FUNCTION_TRACE (UtShortShiftLeft);
373
374
375    /* Return only what was requested */
376
377    if (OutResult)
378    {
379        *OutResult = Operand << Count;
380    }
381
382    return_ACPI_STATUS (AE_OK);
383}
384
385/*******************************************************************************
386 *
387 * FUNCTION:    AcpiUtShortShiftRight
388 *
389 * PARAMETERS:  See function headers above
390 *
391 * DESCRIPTION: Native version of the UtShortShiftRight function.
392 *
393 ******************************************************************************/
394
395ACPI_STATUS
396AcpiUtShortShiftRight (
397    UINT64                  Operand,
398    UINT32                  Count,
399    UINT64                  *OutResult)
400{
401
402    ACPI_FUNCTION_TRACE (UtShortShiftRight);
403
404
405    /* Return only what was requested */
406
407    if (OutResult)
408    {
409        *OutResult = Operand >> Count;
410    }
411
412    return_ACPI_STATUS (AE_OK);
413}
414#endif
415
416/*
417 * Optional support for 64-bit double-precision integer divide. This code
418 * is configurable and is implemented in order to support 32-bit kernel
419 * environments where a 64-bit double-precision math library is not available.
420 *
421 * Support for a more normal 64-bit divide/modulo (with check for a divide-
422 * by-zero) appears after this optional section of code.
423 */
424#ifndef ACPI_USE_NATIVE_DIVIDE
425
426
427/*******************************************************************************
428 *
429 * FUNCTION:    AcpiUtShortDivide
430 *
431 * PARAMETERS:  Dividend            - 64-bit dividend
432 *              Divisor             - 32-bit divisor
433 *              OutQuotient         - Pointer to where the quotient is returned
434 *              OutRemainder        - Pointer to where the remainder is returned
435 *
436 * RETURN:      Status (Checks for divide-by-zero)
437 *
438 * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits)
439 *              divide and modulo. The result is a 64-bit quotient and a
440 *              32-bit remainder.
441 *
442 ******************************************************************************/
443
444ACPI_STATUS
445AcpiUtShortDivide (
446    UINT64                  Dividend,
447    UINT32                  Divisor,
448    UINT64                  *OutQuotient,
449    UINT32                  *OutRemainder)
450{
451    UINT64_OVERLAY          DividendOvl;
452    UINT64_OVERLAY          Quotient;
453    UINT32                  Remainder32;
454
455
456    ACPI_FUNCTION_TRACE (UtShortDivide);
457
458
459    /* Always check for a zero divisor */
460
461    if (Divisor == 0)
462    {
463        ACPI_ERROR ((AE_INFO, "Divide by zero"));
464        return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
465    }
466
467    DividendOvl.Full = Dividend;
468
469    /*
470     * The quotient is 64 bits, the remainder is always 32 bits,
471     * and is generated by the second divide.
472     */
473    ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor,
474        Quotient.Part.Hi, Remainder32);
475
476    ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor,
477        Quotient.Part.Lo, Remainder32);
478
479    /* Return only what was requested */
480
481    if (OutQuotient)
482    {
483        *OutQuotient = Quotient.Full;
484    }
485    if (OutRemainder)
486    {
487        *OutRemainder = Remainder32;
488    }
489
490    return_ACPI_STATUS (AE_OK);
491}
492
493
494/*******************************************************************************
495 *
496 * FUNCTION:    AcpiUtDivide
497 *
498 * PARAMETERS:  InDividend          - Dividend
499 *              InDivisor           - Divisor
500 *              OutQuotient         - Pointer to where the quotient is returned
501 *              OutRemainder        - Pointer to where the remainder is returned
502 *
503 * RETURN:      Status (Checks for divide-by-zero)
504 *
505 * DESCRIPTION: Perform a divide and modulo.
506 *
507 ******************************************************************************/
508
509ACPI_STATUS
510AcpiUtDivide (
511    UINT64                  InDividend,
512    UINT64                  InDivisor,
513    UINT64                  *OutQuotient,
514    UINT64                  *OutRemainder)
515{
516    UINT64_OVERLAY          Dividend;
517    UINT64_OVERLAY          Divisor;
518    UINT64_OVERLAY          Quotient;
519    UINT64_OVERLAY          Remainder;
520    UINT64_OVERLAY          NormalizedDividend;
521    UINT64_OVERLAY          NormalizedDivisor;
522    UINT32                  Partial1;
523    UINT64_OVERLAY          Partial2;
524    UINT64_OVERLAY          Partial3;
525
526
527    ACPI_FUNCTION_TRACE (UtDivide);
528
529
530    /* Always check for a zero divisor */
531
532    if (InDivisor == 0)
533    {
534        ACPI_ERROR ((AE_INFO, "Divide by zero"));
535        return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
536    }
537
538    Divisor.Full  = InDivisor;
539    Dividend.Full = InDividend;
540    if (Divisor.Part.Hi == 0)
541    {
542        /*
543         * 1) Simplest case is where the divisor is 32 bits, we can
544         * just do two divides
545         */
546        Remainder.Part.Hi = 0;
547
548        /*
549         * The quotient is 64 bits, the remainder is always 32 bits,
550         * and is generated by the second divide.
551         */
552        ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo,
553            Quotient.Part.Hi, Partial1);
554
555        ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo,
556            Quotient.Part.Lo, Remainder.Part.Lo);
557    }
558
559    else
560    {
561        /*
562         * 2) The general case where the divisor is a full 64 bits
563         * is more difficult
564         */
565        Quotient.Part.Hi   = 0;
566        NormalizedDividend = Dividend;
567        NormalizedDivisor  = Divisor;
568
569        /* Normalize the operands (shift until the divisor is < 32 bits) */
570
571        do
572        {
573            ACPI_SHIFT_RIGHT_64 (
574                NormalizedDivisor.Part.Hi, NormalizedDivisor.Part.Lo);
575            ACPI_SHIFT_RIGHT_64 (
576                NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo);
577
578        } while (NormalizedDivisor.Part.Hi != 0);
579
580        /* Partial divide */
581
582        ACPI_DIV_64_BY_32 (
583            NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo,
584            NormalizedDivisor.Part.Lo, Quotient.Part.Lo, Partial1);
585
586        /*
587         * The quotient is always 32 bits, and simply requires
588         * adjustment. The 64-bit remainder must be generated.
589         */
590        Partial1 = Quotient.Part.Lo * Divisor.Part.Hi;
591        Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo;
592        Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1;
593
594        Remainder.Part.Hi = Partial3.Part.Lo;
595        Remainder.Part.Lo = Partial2.Part.Lo;
596
597        if (Partial3.Part.Hi == 0)
598        {
599            if (Partial3.Part.Lo >= Dividend.Part.Hi)
600            {
601                if (Partial3.Part.Lo == Dividend.Part.Hi)
602                {
603                    if (Partial2.Part.Lo > Dividend.Part.Lo)
604                    {
605                        Quotient.Part.Lo--;
606                        Remainder.Full -= Divisor.Full;
607                    }
608                }
609                else
610                {
611                    Quotient.Part.Lo--;
612                    Remainder.Full -= Divisor.Full;
613                }
614            }
615
616            Remainder.Full = Remainder.Full - Dividend.Full;
617            Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi);
618            Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo);
619
620            if (Remainder.Part.Lo)
621            {
622                Remainder.Part.Hi--;
623            }
624        }
625    }
626
627    /* Return only what was requested */
628
629    if (OutQuotient)
630    {
631        *OutQuotient = Quotient.Full;
632    }
633    if (OutRemainder)
634    {
635        *OutRemainder = Remainder.Full;
636    }
637
638    return_ACPI_STATUS (AE_OK);
639}
640
641#else
642
643/*******************************************************************************
644 *
645 * FUNCTION:    AcpiUtShortDivide, AcpiUtDivide
646 *
647 * PARAMETERS:  See function headers above
648 *
649 * DESCRIPTION: Native versions of the UtDivide functions. Use these if either
650 *              1) The target is a 64-bit platform and therefore 64-bit
651 *                 integer math is supported directly by the machine.
652 *              2) The target is a 32-bit or 16-bit platform, and the
653 *                 double-precision integer math library is available to
654 *                 perform the divide.
655 *
656 ******************************************************************************/
657
658ACPI_STATUS
659AcpiUtShortDivide (
660    UINT64                  InDividend,
661    UINT32                  Divisor,
662    UINT64                  *OutQuotient,
663    UINT32                  *OutRemainder)
664{
665
666    ACPI_FUNCTION_TRACE (UtShortDivide);
667
668
669    /* Always check for a zero divisor */
670
671    if (Divisor == 0)
672    {
673        ACPI_ERROR ((AE_INFO, "Divide by zero"));
674        return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
675    }
676
677    /* Return only what was requested */
678
679    if (OutQuotient)
680    {
681        *OutQuotient = InDividend / Divisor;
682    }
683    if (OutRemainder)
684    {
685        *OutRemainder = (UINT32) (InDividend % Divisor);
686    }
687
688    return_ACPI_STATUS (AE_OK);
689}
690
691ACPI_STATUS
692AcpiUtDivide (
693    UINT64                  InDividend,
694    UINT64                  InDivisor,
695    UINT64                  *OutQuotient,
696    UINT64                  *OutRemainder)
697{
698    ACPI_FUNCTION_TRACE (UtDivide);
699
700
701    /* Always check for a zero divisor */
702
703    if (InDivisor == 0)
704    {
705        ACPI_ERROR ((AE_INFO, "Divide by zero"));
706        return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO);
707    }
708
709
710    /* Return only what was requested */
711
712    if (OutQuotient)
713    {
714        *OutQuotient = InDividend / InDivisor;
715    }
716    if (OutRemainder)
717    {
718        *OutRemainder = InDividend % InDivisor;
719    }
720
721    return_ACPI_STATUS (AE_OK);
722}
723
724#endif
725