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File indexing completed on 2025-05-11 08:24:03
0001 /******************************************************************************* 0002 * 0003 * Module Name: utmath - Integer math support routines 0004 * 0005 ******************************************************************************/ 0006 0007 /****************************************************************************** 0008 * 0009 * 1. Copyright Notice 0010 * 0011 * Some or all of this work - Copyright (c) 1999 - 2024, Intel Corp. 0012 * All rights reserved. 0013 * 0014 * 2. License 0015 * 0016 * 2.1. This is your license from Intel Corp. under its intellectual property 0017 * rights. You may have additional license terms from the party that provided 0018 * you this software, covering your right to use that party's intellectual 0019 * property rights. 0020 * 0021 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 0022 * copy of the source code appearing in this file ("Covered Code") an 0023 * irrevocable, perpetual, worldwide license under Intel's copyrights in the 0024 * base code distributed originally by Intel ("Original Intel Code") to copy, 0025 * make derivatives, distribute, use and display any portion of the Covered 0026 * Code in any form, with the right to sublicense such rights; and 0027 * 0028 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 0029 * license (with the right to sublicense), under only those claims of Intel 0030 * patents that are infringed by the Original Intel Code, to make, use, sell, 0031 * offer to sell, and import the Covered Code and derivative works thereof 0032 * solely to the minimum extent necessary to exercise the above copyright 0033 * license, and in no event shall the patent license extend to any additions 0034 * to or modifications of the Original Intel Code. No other license or right 0035 * is granted directly or by implication, estoppel or otherwise; 0036 * 0037 * The above copyright and patent license is granted only if the following 0038 * conditions are met: 0039 * 0040 * 3. Conditions 0041 * 0042 * 3.1. Redistribution of Source with Rights to Further Distribute Source. 0043 * Redistribution of source code of any substantial portion of the Covered 0044 * Code or modification with rights to further distribute source must include 0045 * the above Copyright Notice, the above License, this list of Conditions, 0046 * and the following Disclaimer and Export Compliance provision. In addition, 0047 * Licensee must cause all Covered Code to which Licensee contributes to 0048 * contain a file documenting the changes Licensee made to create that Covered 0049 * Code and the date of any change. Licensee must include in that file the 0050 * documentation of any changes made by any predecessor Licensee. Licensee 0051 * must include a prominent statement that the modification is derived, 0052 * directly or indirectly, from Original Intel Code. 0053 * 0054 * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 0055 * Redistribution of source code of any substantial portion of the Covered 0056 * Code or modification without rights to further distribute source must 0057 * include the following Disclaimer and Export Compliance provision in the 0058 * documentation and/or other materials provided with distribution. In 0059 * addition, Licensee may not authorize further sublicense of source of any 0060 * portion of the Covered Code, and must include terms to the effect that the 0061 * license from Licensee to its licensee is limited to the intellectual 0062 * property embodied in the software Licensee provides to its licensee, and 0063 * not to intellectual property embodied in modifications its licensee may 0064 * make. 0065 * 0066 * 3.3. Redistribution of Executable. Redistribution in executable form of any 0067 * substantial portion of the Covered Code or modification must reproduce the 0068 * above Copyright Notice, and the following Disclaimer and Export Compliance 0069 * provision in the documentation and/or other materials provided with the 0070 * distribution. 0071 * 0072 * 3.4. Intel retains all right, title, and interest in and to the Original 0073 * Intel Code. 0074 * 0075 * 3.5. Neither the name Intel nor any other trademark owned or controlled by 0076 * Intel shall be used in advertising or otherwise to promote the sale, use or 0077 * other dealings in products derived from or relating to the Covered Code 0078 * without prior written authorization from Intel. 0079 * 0080 * 4. Disclaimer and Export Compliance 0081 * 0082 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 0083 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 0084 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 0085 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 0086 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 0087 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 0088 * PARTICULAR PURPOSE. 0089 * 0090 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 0091 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 0092 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 0093 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 0094 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 0095 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 0096 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 0097 * LIMITED REMEDY. 0098 * 0099 * 4.3. Licensee shall not export, either directly or indirectly, any of this 0100 * software or system incorporating such software without first obtaining any 0101 * required license or other approval from the U. S. Department of Commerce or 0102 * any other agency or department of the United States Government. In the 0103 * event Licensee exports any such software from the United States or 0104 * re-exports any such software from a foreign destination, Licensee shall 0105 * ensure that the distribution and export/re-export of the software is in 0106 * compliance with all laws, regulations, orders, or other restrictions of the 0107 * U.S. Export Administration Regulations. Licensee agrees that neither it nor 0108 * any of its subsidiaries will export/re-export any technical data, process, 0109 * software, or service, directly or indirectly, to any country for which the 0110 * United States government or any agency thereof requires an export license, 0111 * other governmental approval, or letter of assurance, without first obtaining 0112 * such license, approval or letter. 0113 * 0114 ***************************************************************************** 0115 * 0116 * Alternatively, you may choose to be licensed under the terms of the 0117 * following license: 0118 * 0119 * Redistribution and use in source and binary forms, with or without 0120 * modification, are permitted provided that the following conditions 0121 * are met: 0122 * 1. Redistributions of source code must retain the above copyright 0123 * notice, this list of conditions, and the following disclaimer, 0124 * without modification. 0125 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 0126 * substantially similar to the "NO WARRANTY" disclaimer below 0127 * ("Disclaimer") and any redistribution must be conditioned upon 0128 * including a substantially similar Disclaimer requirement for further 0129 * binary redistribution. 0130 * 3. Neither the names of the above-listed copyright holders nor the names 0131 * of any contributors may be used to endorse or promote products derived 0132 * from this software without specific prior written permission. 0133 * 0134 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 0135 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 0136 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 0137 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 0138 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 0139 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 0140 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 0141 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 0142 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 0143 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 0144 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 0145 * 0146 * Alternatively, you may choose to be licensed under the terms of the 0147 * GNU General Public License ("GPL") version 2 as published by the Free 0148 * Software Foundation. 0149 * 0150 *****************************************************************************/ 0151 0152 #include "acpi.h" 0153 #include "accommon.h" 0154 0155 0156 #define _COMPONENT ACPI_UTILITIES 0157 ACPI_MODULE_NAME ("utmath") 0158 0159 /* Structures used only for 64-bit divide */ 0160 0161 typedef struct uint64_struct 0162 { 0163 UINT32 Lo; 0164 UINT32 Hi; 0165 0166 } UINT64_STRUCT; 0167 0168 typedef union uint64_overlay 0169 { 0170 UINT64 Full; 0171 UINT64_STRUCT Part; 0172 0173 } UINT64_OVERLAY; 0174 0175 /* 0176 * Optional support for 64-bit double-precision integer multiply and shift. 0177 * This code is configurable and is implemented in order to support 32-bit 0178 * kernel environments where a 64-bit double-precision math library is not 0179 * available. 0180 */ 0181 #ifndef ACPI_USE_NATIVE_MATH64 0182 0183 /******************************************************************************* 0184 * 0185 * FUNCTION: AcpiUtShortMultiply 0186 * 0187 * PARAMETERS: Multiplicand - 64-bit multiplicand 0188 * Multiplier - 32-bit multiplier 0189 * OutProduct - Pointer to where the product is returned 0190 * 0191 * DESCRIPTION: Perform a short multiply. 0192 * 0193 ******************************************************************************/ 0194 0195 ACPI_STATUS 0196 AcpiUtShortMultiply ( 0197 UINT64 Multiplicand, 0198 UINT32 Multiplier, 0199 UINT64 *OutProduct) 0200 { 0201 UINT64_OVERLAY MultiplicandOvl; 0202 UINT64_OVERLAY Product; 0203 UINT32 Carry32; 0204 0205 0206 ACPI_FUNCTION_TRACE (UtShortMultiply); 0207 0208 0209 MultiplicandOvl.Full = Multiplicand; 0210 0211 /* 0212 * The Product is 64 bits, the carry is always 32 bits, 0213 * and is generated by the second multiply. 0214 */ 0215 ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Hi, Multiplier, 0216 Product.Part.Hi, Carry32); 0217 0218 ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Lo, Multiplier, 0219 Product.Part.Lo, Carry32); 0220 0221 Product.Part.Hi += Carry32; 0222 0223 /* Return only what was requested */ 0224 0225 if (OutProduct) 0226 { 0227 *OutProduct = Product.Full; 0228 } 0229 0230 return_ACPI_STATUS (AE_OK); 0231 } 0232 0233 0234 /******************************************************************************* 0235 * 0236 * FUNCTION: AcpiUtShortShiftLeft 0237 * 0238 * PARAMETERS: Operand - 64-bit shift operand 0239 * Count - 32-bit shift count 0240 * OutResult - Pointer to where the result is returned 0241 * 0242 * DESCRIPTION: Perform a short left shift. 0243 * 0244 ******************************************************************************/ 0245 0246 ACPI_STATUS 0247 AcpiUtShortShiftLeft ( 0248 UINT64 Operand, 0249 UINT32 Count, 0250 UINT64 *OutResult) 0251 { 0252 UINT64_OVERLAY OperandOvl; 0253 0254 0255 ACPI_FUNCTION_TRACE (UtShortShiftLeft); 0256 0257 0258 OperandOvl.Full = Operand; 0259 0260 if ((Count & 63) >= 32) 0261 { 0262 OperandOvl.Part.Hi = OperandOvl.Part.Lo; 0263 OperandOvl.Part.Lo = 0; 0264 Count = (Count & 63) - 32; 0265 } 0266 ACPI_SHIFT_LEFT_64_BY_32 (OperandOvl.Part.Hi, 0267 OperandOvl.Part.Lo, Count); 0268 0269 /* Return only what was requested */ 0270 0271 if (OutResult) 0272 { 0273 *OutResult = OperandOvl.Full; 0274 } 0275 0276 return_ACPI_STATUS (AE_OK); 0277 } 0278 0279 /******************************************************************************* 0280 * 0281 * FUNCTION: AcpiUtShortShiftRight 0282 * 0283 * PARAMETERS: Operand - 64-bit shift operand 0284 * Count - 32-bit shift count 0285 * OutResult - Pointer to where the result is returned 0286 * 0287 * DESCRIPTION: Perform a short right shift. 0288 * 0289 ******************************************************************************/ 0290 0291 ACPI_STATUS 0292 AcpiUtShortShiftRight ( 0293 UINT64 Operand, 0294 UINT32 Count, 0295 UINT64 *OutResult) 0296 { 0297 UINT64_OVERLAY OperandOvl; 0298 0299 0300 ACPI_FUNCTION_TRACE (UtShortShiftRight); 0301 0302 0303 OperandOvl.Full = Operand; 0304 0305 if ((Count & 63) >= 32) 0306 { 0307 OperandOvl.Part.Lo = OperandOvl.Part.Hi; 0308 OperandOvl.Part.Hi = 0; 0309 Count = (Count & 63) - 32; 0310 } 0311 ACPI_SHIFT_RIGHT_64_BY_32 (OperandOvl.Part.Hi, 0312 OperandOvl.Part.Lo, Count); 0313 0314 /* Return only what was requested */ 0315 0316 if (OutResult) 0317 { 0318 *OutResult = OperandOvl.Full; 0319 } 0320 0321 return_ACPI_STATUS (AE_OK); 0322 } 0323 #else 0324 0325 /******************************************************************************* 0326 * 0327 * FUNCTION: AcpiUtShortMultiply 0328 * 0329 * PARAMETERS: See function headers above 0330 * 0331 * DESCRIPTION: Native version of the UtShortMultiply function. 0332 * 0333 ******************************************************************************/ 0334 0335 ACPI_STATUS 0336 AcpiUtShortMultiply ( 0337 UINT64 Multiplicand, 0338 UINT32 Multiplier, 0339 UINT64 *OutProduct) 0340 { 0341 0342 ACPI_FUNCTION_TRACE (UtShortMultiply); 0343 0344 0345 /* Return only what was requested */ 0346 0347 if (OutProduct) 0348 { 0349 *OutProduct = Multiplicand * Multiplier; 0350 } 0351 0352 return_ACPI_STATUS (AE_OK); 0353 } 0354 0355 /******************************************************************************* 0356 * 0357 * FUNCTION: AcpiUtShortShiftLeft 0358 * 0359 * PARAMETERS: See function headers above 0360 * 0361 * DESCRIPTION: Native version of the UtShortShiftLeft function. 0362 * 0363 ******************************************************************************/ 0364 0365 ACPI_STATUS 0366 AcpiUtShortShiftLeft ( 0367 UINT64 Operand, 0368 UINT32 Count, 0369 UINT64 *OutResult) 0370 { 0371 0372 ACPI_FUNCTION_TRACE (UtShortShiftLeft); 0373 0374 0375 /* Return only what was requested */ 0376 0377 if (OutResult) 0378 { 0379 *OutResult = Operand << Count; 0380 } 0381 0382 return_ACPI_STATUS (AE_OK); 0383 } 0384 0385 /******************************************************************************* 0386 * 0387 * FUNCTION: AcpiUtShortShiftRight 0388 * 0389 * PARAMETERS: See function headers above 0390 * 0391 * DESCRIPTION: Native version of the UtShortShiftRight function. 0392 * 0393 ******************************************************************************/ 0394 0395 ACPI_STATUS 0396 AcpiUtShortShiftRight ( 0397 UINT64 Operand, 0398 UINT32 Count, 0399 UINT64 *OutResult) 0400 { 0401 0402 ACPI_FUNCTION_TRACE (UtShortShiftRight); 0403 0404 0405 /* Return only what was requested */ 0406 0407 if (OutResult) 0408 { 0409 *OutResult = Operand >> Count; 0410 } 0411 0412 return_ACPI_STATUS (AE_OK); 0413 } 0414 #endif 0415 0416 /* 0417 * Optional support for 64-bit double-precision integer divide. This code 0418 * is configurable and is implemented in order to support 32-bit kernel 0419 * environments where a 64-bit double-precision math library is not available. 0420 * 0421 * Support for a more normal 64-bit divide/modulo (with check for a divide- 0422 * by-zero) appears after this optional section of code. 0423 */ 0424 #ifndef ACPI_USE_NATIVE_DIVIDE 0425 0426 0427 /******************************************************************************* 0428 * 0429 * FUNCTION: AcpiUtShortDivide 0430 * 0431 * PARAMETERS: Dividend - 64-bit dividend 0432 * Divisor - 32-bit divisor 0433 * OutQuotient - Pointer to where the quotient is returned 0434 * OutRemainder - Pointer to where the remainder is returned 0435 * 0436 * RETURN: Status (Checks for divide-by-zero) 0437 * 0438 * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits) 0439 * divide and modulo. The result is a 64-bit quotient and a 0440 * 32-bit remainder. 0441 * 0442 ******************************************************************************/ 0443 0444 ACPI_STATUS 0445 AcpiUtShortDivide ( 0446 UINT64 Dividend, 0447 UINT32 Divisor, 0448 UINT64 *OutQuotient, 0449 UINT32 *OutRemainder) 0450 { 0451 UINT64_OVERLAY DividendOvl; 0452 UINT64_OVERLAY Quotient; 0453 UINT32 Remainder32; 0454 0455 0456 ACPI_FUNCTION_TRACE (UtShortDivide); 0457 0458 0459 /* Always check for a zero divisor */ 0460 0461 if (Divisor == 0) 0462 { 0463 ACPI_ERROR ((AE_INFO, "Divide by zero")); 0464 return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 0465 } 0466 0467 DividendOvl.Full = Dividend; 0468 0469 /* 0470 * The quotient is 64 bits, the remainder is always 32 bits, 0471 * and is generated by the second divide. 0472 */ 0473 ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor, 0474 Quotient.Part.Hi, Remainder32); 0475 0476 ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor, 0477 Quotient.Part.Lo, Remainder32); 0478 0479 /* Return only what was requested */ 0480 0481 if (OutQuotient) 0482 { 0483 *OutQuotient = Quotient.Full; 0484 } 0485 if (OutRemainder) 0486 { 0487 *OutRemainder = Remainder32; 0488 } 0489 0490 return_ACPI_STATUS (AE_OK); 0491 } 0492 0493 0494 /******************************************************************************* 0495 * 0496 * FUNCTION: AcpiUtDivide 0497 * 0498 * PARAMETERS: InDividend - Dividend 0499 * InDivisor - Divisor 0500 * OutQuotient - Pointer to where the quotient is returned 0501 * OutRemainder - Pointer to where the remainder is returned 0502 * 0503 * RETURN: Status (Checks for divide-by-zero) 0504 * 0505 * DESCRIPTION: Perform a divide and modulo. 0506 * 0507 ******************************************************************************/ 0508 0509 ACPI_STATUS 0510 AcpiUtDivide ( 0511 UINT64 InDividend, 0512 UINT64 InDivisor, 0513 UINT64 *OutQuotient, 0514 UINT64 *OutRemainder) 0515 { 0516 UINT64_OVERLAY Dividend; 0517 UINT64_OVERLAY Divisor; 0518 UINT64_OVERLAY Quotient; 0519 UINT64_OVERLAY Remainder; 0520 UINT64_OVERLAY NormalizedDividend; 0521 UINT64_OVERLAY NormalizedDivisor; 0522 UINT32 Partial1; 0523 UINT64_OVERLAY Partial2; 0524 UINT64_OVERLAY Partial3; 0525 0526 0527 ACPI_FUNCTION_TRACE (UtDivide); 0528 0529 0530 /* Always check for a zero divisor */ 0531 0532 if (InDivisor == 0) 0533 { 0534 ACPI_ERROR ((AE_INFO, "Divide by zero")); 0535 return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 0536 } 0537 0538 Divisor.Full = InDivisor; 0539 Dividend.Full = InDividend; 0540 if (Divisor.Part.Hi == 0) 0541 { 0542 /* 0543 * 1) Simplest case is where the divisor is 32 bits, we can 0544 * just do two divides 0545 */ 0546 Remainder.Part.Hi = 0; 0547 0548 /* 0549 * The quotient is 64 bits, the remainder is always 32 bits, 0550 * and is generated by the second divide. 0551 */ 0552 ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo, 0553 Quotient.Part.Hi, Partial1); 0554 0555 ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo, 0556 Quotient.Part.Lo, Remainder.Part.Lo); 0557 } 0558 0559 else 0560 { 0561 /* 0562 * 2) The general case where the divisor is a full 64 bits 0563 * is more difficult 0564 */ 0565 Quotient.Part.Hi = 0; 0566 NormalizedDividend = Dividend; 0567 NormalizedDivisor = Divisor; 0568 0569 /* Normalize the operands (shift until the divisor is < 32 bits) */ 0570 0571 do 0572 { 0573 ACPI_SHIFT_RIGHT_64 ( 0574 NormalizedDivisor.Part.Hi, NormalizedDivisor.Part.Lo); 0575 ACPI_SHIFT_RIGHT_64 ( 0576 NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo); 0577 0578 } while (NormalizedDivisor.Part.Hi != 0); 0579 0580 /* Partial divide */ 0581 0582 ACPI_DIV_64_BY_32 ( 0583 NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo, 0584 NormalizedDivisor.Part.Lo, Quotient.Part.Lo, Partial1); 0585 0586 /* 0587 * The quotient is always 32 bits, and simply requires 0588 * adjustment. The 64-bit remainder must be generated. 0589 */ 0590 Partial1 = Quotient.Part.Lo * Divisor.Part.Hi; 0591 Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo; 0592 Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1; 0593 0594 Remainder.Part.Hi = Partial3.Part.Lo; 0595 Remainder.Part.Lo = Partial2.Part.Lo; 0596 0597 if (Partial3.Part.Hi == 0) 0598 { 0599 if (Partial3.Part.Lo >= Dividend.Part.Hi) 0600 { 0601 if (Partial3.Part.Lo == Dividend.Part.Hi) 0602 { 0603 if (Partial2.Part.Lo > Dividend.Part.Lo) 0604 { 0605 Quotient.Part.Lo--; 0606 Remainder.Full -= Divisor.Full; 0607 } 0608 } 0609 else 0610 { 0611 Quotient.Part.Lo--; 0612 Remainder.Full -= Divisor.Full; 0613 } 0614 } 0615 0616 Remainder.Full = Remainder.Full - Dividend.Full; 0617 Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi); 0618 Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo); 0619 0620 if (Remainder.Part.Lo) 0621 { 0622 Remainder.Part.Hi--; 0623 } 0624 } 0625 } 0626 0627 /* Return only what was requested */ 0628 0629 if (OutQuotient) 0630 { 0631 *OutQuotient = Quotient.Full; 0632 } 0633 if (OutRemainder) 0634 { 0635 *OutRemainder = Remainder.Full; 0636 } 0637 0638 return_ACPI_STATUS (AE_OK); 0639 } 0640 0641 #else 0642 0643 /******************************************************************************* 0644 * 0645 * FUNCTION: AcpiUtShortDivide, AcpiUtDivide 0646 * 0647 * PARAMETERS: See function headers above 0648 * 0649 * DESCRIPTION: Native versions of the UtDivide functions. Use these if either 0650 * 1) The target is a 64-bit platform and therefore 64-bit 0651 * integer math is supported directly by the machine. 0652 * 2) The target is a 32-bit or 16-bit platform, and the 0653 * double-precision integer math library is available to 0654 * perform the divide. 0655 * 0656 ******************************************************************************/ 0657 0658 ACPI_STATUS 0659 AcpiUtShortDivide ( 0660 UINT64 InDividend, 0661 UINT32 Divisor, 0662 UINT64 *OutQuotient, 0663 UINT32 *OutRemainder) 0664 { 0665 0666 ACPI_FUNCTION_TRACE (UtShortDivide); 0667 0668 0669 /* Always check for a zero divisor */ 0670 0671 if (Divisor == 0) 0672 { 0673 ACPI_ERROR ((AE_INFO, "Divide by zero")); 0674 return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 0675 } 0676 0677 /* Return only what was requested */ 0678 0679 if (OutQuotient) 0680 { 0681 *OutQuotient = InDividend / Divisor; 0682 } 0683 if (OutRemainder) 0684 { 0685 *OutRemainder = (UINT32) (InDividend % Divisor); 0686 } 0687 0688 return_ACPI_STATUS (AE_OK); 0689 } 0690 0691 ACPI_STATUS 0692 AcpiUtDivide ( 0693 UINT64 InDividend, 0694 UINT64 InDivisor, 0695 UINT64 *OutQuotient, 0696 UINT64 *OutRemainder) 0697 { 0698 ACPI_FUNCTION_TRACE (UtDivide); 0699 0700 0701 /* Always check for a zero divisor */ 0702 0703 if (InDivisor == 0) 0704 { 0705 ACPI_ERROR ((AE_INFO, "Divide by zero")); 0706 return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 0707 } 0708 0709 0710 /* Return only what was requested */ 0711 0712 if (OutQuotient) 0713 { 0714 *OutQuotient = InDividend / InDivisor; 0715 } 0716 if (OutRemainder) 0717 { 0718 *OutRemainder = InDividend % InDivisor; 0719 } 0720 0721 return_ACPI_STATUS (AE_OK); 0722 } 0723 0724 #endif
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