10d02842fSSascha Wildner /******************************************************************************* 20d02842fSSascha Wildner * 30d02842fSSascha Wildner * Module Name: utmath - Integer math support routines 40d02842fSSascha Wildner * 50d02842fSSascha Wildner ******************************************************************************/ 60d02842fSSascha Wildner 7*b4315fc7SSascha Wildner /****************************************************************************** 8*b4315fc7SSascha Wildner * 9*b4315fc7SSascha Wildner * 1. Copyright Notice 10*b4315fc7SSascha Wildner * 11*b4315fc7SSascha Wildner * Some or all of this work - Copyright (c) 1999 - 2017, Intel Corp. 120d02842fSSascha Wildner * All rights reserved. 130d02842fSSascha Wildner * 14*b4315fc7SSascha Wildner * 2. License 15*b4315fc7SSascha Wildner * 16*b4315fc7SSascha Wildner * 2.1. This is your license from Intel Corp. under its intellectual property 17*b4315fc7SSascha Wildner * rights. You may have additional license terms from the party that provided 18*b4315fc7SSascha Wildner * you this software, covering your right to use that party's intellectual 19*b4315fc7SSascha Wildner * property rights. 20*b4315fc7SSascha Wildner * 21*b4315fc7SSascha Wildner * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22*b4315fc7SSascha Wildner * copy of the source code appearing in this file ("Covered Code") an 23*b4315fc7SSascha Wildner * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24*b4315fc7SSascha Wildner * base code distributed originally by Intel ("Original Intel Code") to copy, 25*b4315fc7SSascha Wildner * make derivatives, distribute, use and display any portion of the Covered 26*b4315fc7SSascha Wildner * Code in any form, with the right to sublicense such rights; and 27*b4315fc7SSascha Wildner * 28*b4315fc7SSascha Wildner * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29*b4315fc7SSascha Wildner * license (with the right to sublicense), under only those claims of Intel 30*b4315fc7SSascha Wildner * patents that are infringed by the Original Intel Code, to make, use, sell, 31*b4315fc7SSascha Wildner * offer to sell, and import the Covered Code and derivative works thereof 32*b4315fc7SSascha Wildner * solely to the minimum extent necessary to exercise the above copyright 33*b4315fc7SSascha Wildner * license, and in no event shall the patent license extend to any additions 34*b4315fc7SSascha Wildner * to or modifications of the Original Intel Code. No other license or right 35*b4315fc7SSascha Wildner * is granted directly or by implication, estoppel or otherwise; 36*b4315fc7SSascha Wildner * 37*b4315fc7SSascha Wildner * The above copyright and patent license is granted only if the following 38*b4315fc7SSascha Wildner * conditions are met: 39*b4315fc7SSascha Wildner * 40*b4315fc7SSascha Wildner * 3. Conditions 41*b4315fc7SSascha Wildner * 42*b4315fc7SSascha Wildner * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43*b4315fc7SSascha Wildner * Redistribution of source code of any substantial portion of the Covered 44*b4315fc7SSascha Wildner * Code or modification with rights to further distribute source must include 45*b4315fc7SSascha Wildner * the above Copyright Notice, the above License, this list of Conditions, 46*b4315fc7SSascha Wildner * and the following Disclaimer and Export Compliance provision. In addition, 47*b4315fc7SSascha Wildner * Licensee must cause all Covered Code to which Licensee contributes to 48*b4315fc7SSascha Wildner * contain a file documenting the changes Licensee made to create that Covered 49*b4315fc7SSascha Wildner * Code and the date of any change. Licensee must include in that file the 50*b4315fc7SSascha Wildner * documentation of any changes made by any predecessor Licensee. Licensee 51*b4315fc7SSascha Wildner * must include a prominent statement that the modification is derived, 52*b4315fc7SSascha Wildner * directly or indirectly, from Original Intel Code. 53*b4315fc7SSascha Wildner * 54*b4315fc7SSascha Wildner * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55*b4315fc7SSascha Wildner * Redistribution of source code of any substantial portion of the Covered 56*b4315fc7SSascha Wildner * Code or modification without rights to further distribute source must 57*b4315fc7SSascha Wildner * include the following Disclaimer and Export Compliance provision in the 58*b4315fc7SSascha Wildner * documentation and/or other materials provided with distribution. In 59*b4315fc7SSascha Wildner * addition, Licensee may not authorize further sublicense of source of any 60*b4315fc7SSascha Wildner * portion of the Covered Code, and must include terms to the effect that the 61*b4315fc7SSascha Wildner * license from Licensee to its licensee is limited to the intellectual 62*b4315fc7SSascha Wildner * property embodied in the software Licensee provides to its licensee, and 63*b4315fc7SSascha Wildner * not to intellectual property embodied in modifications its licensee may 64*b4315fc7SSascha Wildner * make. 65*b4315fc7SSascha Wildner * 66*b4315fc7SSascha Wildner * 3.3. Redistribution of Executable. Redistribution in executable form of any 67*b4315fc7SSascha Wildner * substantial portion of the Covered Code or modification must reproduce the 68*b4315fc7SSascha Wildner * above Copyright Notice, and the following Disclaimer and Export Compliance 69*b4315fc7SSascha Wildner * provision in the documentation and/or other materials provided with the 70*b4315fc7SSascha Wildner * distribution. 71*b4315fc7SSascha Wildner * 72*b4315fc7SSascha Wildner * 3.4. Intel retains all right, title, and interest in and to the Original 73*b4315fc7SSascha Wildner * Intel Code. 74*b4315fc7SSascha Wildner * 75*b4315fc7SSascha Wildner * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76*b4315fc7SSascha Wildner * Intel shall be used in advertising or otherwise to promote the sale, use or 77*b4315fc7SSascha Wildner * other dealings in products derived from or relating to the Covered Code 78*b4315fc7SSascha Wildner * without prior written authorization from Intel. 79*b4315fc7SSascha Wildner * 80*b4315fc7SSascha Wildner * 4. Disclaimer and Export Compliance 81*b4315fc7SSascha Wildner * 82*b4315fc7SSascha Wildner * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83*b4315fc7SSascha Wildner * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84*b4315fc7SSascha Wildner * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85*b4315fc7SSascha Wildner * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86*b4315fc7SSascha Wildner * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87*b4315fc7SSascha Wildner * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88*b4315fc7SSascha Wildner * PARTICULAR PURPOSE. 89*b4315fc7SSascha Wildner * 90*b4315fc7SSascha Wildner * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91*b4315fc7SSascha Wildner * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92*b4315fc7SSascha Wildner * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93*b4315fc7SSascha Wildner * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94*b4315fc7SSascha Wildner * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95*b4315fc7SSascha Wildner * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96*b4315fc7SSascha Wildner * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97*b4315fc7SSascha Wildner * LIMITED REMEDY. 98*b4315fc7SSascha Wildner * 99*b4315fc7SSascha Wildner * 4.3. Licensee shall not export, either directly or indirectly, any of this 100*b4315fc7SSascha Wildner * software or system incorporating such software without first obtaining any 101*b4315fc7SSascha Wildner * required license or other approval from the U. S. Department of Commerce or 102*b4315fc7SSascha Wildner * any other agency or department of the United States Government. In the 103*b4315fc7SSascha Wildner * event Licensee exports any such software from the United States or 104*b4315fc7SSascha Wildner * re-exports any such software from a foreign destination, Licensee shall 105*b4315fc7SSascha Wildner * ensure that the distribution and export/re-export of the software is in 106*b4315fc7SSascha Wildner * compliance with all laws, regulations, orders, or other restrictions of the 107*b4315fc7SSascha Wildner * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108*b4315fc7SSascha Wildner * any of its subsidiaries will export/re-export any technical data, process, 109*b4315fc7SSascha Wildner * software, or service, directly or indirectly, to any country for which the 110*b4315fc7SSascha Wildner * United States government or any agency thereof requires an export license, 111*b4315fc7SSascha Wildner * other governmental approval, or letter of assurance, without first obtaining 112*b4315fc7SSascha Wildner * such license, approval or letter. 113*b4315fc7SSascha Wildner * 114*b4315fc7SSascha Wildner ***************************************************************************** 115*b4315fc7SSascha Wildner * 116*b4315fc7SSascha Wildner * Alternatively, you may choose to be licensed under the terms of the 117*b4315fc7SSascha Wildner * following license: 118*b4315fc7SSascha Wildner * 1190d02842fSSascha Wildner * Redistribution and use in source and binary forms, with or without 1200d02842fSSascha Wildner * modification, are permitted provided that the following conditions 1210d02842fSSascha Wildner * are met: 1220d02842fSSascha Wildner * 1. Redistributions of source code must retain the above copyright 1230d02842fSSascha Wildner * notice, this list of conditions, and the following disclaimer, 1240d02842fSSascha Wildner * without modification. 1250d02842fSSascha Wildner * 2. Redistributions in binary form must reproduce at minimum a disclaimer 1260d02842fSSascha Wildner * substantially similar to the "NO WARRANTY" disclaimer below 1270d02842fSSascha Wildner * ("Disclaimer") and any redistribution must be conditioned upon 1280d02842fSSascha Wildner * including a substantially similar Disclaimer requirement for further 1290d02842fSSascha Wildner * binary redistribution. 1300d02842fSSascha Wildner * 3. Neither the names of the above-listed copyright holders nor the names 1310d02842fSSascha Wildner * of any contributors may be used to endorse or promote products derived 1320d02842fSSascha Wildner * from this software without specific prior written permission. 1330d02842fSSascha Wildner * 134*b4315fc7SSascha Wildner * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135*b4315fc7SSascha Wildner * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136*b4315fc7SSascha Wildner * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137*b4315fc7SSascha Wildner * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138*b4315fc7SSascha Wildner * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139*b4315fc7SSascha Wildner * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140*b4315fc7SSascha Wildner * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141*b4315fc7SSascha Wildner * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142*b4315fc7SSascha Wildner * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143*b4315fc7SSascha Wildner * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144*b4315fc7SSascha Wildner * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145*b4315fc7SSascha Wildner * 146*b4315fc7SSascha Wildner * Alternatively, you may choose to be licensed under the terms of the 1470d02842fSSascha Wildner * GNU General Public License ("GPL") version 2 as published by the Free 1480d02842fSSascha Wildner * Software Foundation. 1490d02842fSSascha Wildner * 150*b4315fc7SSascha Wildner *****************************************************************************/ 1510d02842fSSascha Wildner 1520d02842fSSascha Wildner #include "acpi.h" 1530d02842fSSascha Wildner #include "accommon.h" 1540d02842fSSascha Wildner 1550d02842fSSascha Wildner 1560d02842fSSascha Wildner #define _COMPONENT ACPI_UTILITIES 1570d02842fSSascha Wildner ACPI_MODULE_NAME ("utmath") 1580d02842fSSascha Wildner 1590d02842fSSascha Wildner /* 1600d02842fSSascha Wildner * Optional support for 64-bit double-precision integer divide. This code 1610d02842fSSascha Wildner * is configurable and is implemented in order to support 32-bit kernel 1620d02842fSSascha Wildner * environments where a 64-bit double-precision math library is not available. 1630d02842fSSascha Wildner * 1640d02842fSSascha Wildner * Support for a more normal 64-bit divide/modulo (with check for a divide- 1650d02842fSSascha Wildner * by-zero) appears after this optional section of code. 1660d02842fSSascha Wildner */ 1670d02842fSSascha Wildner #ifndef ACPI_USE_NATIVE_DIVIDE 1680d02842fSSascha Wildner 1690d02842fSSascha Wildner /* Structures used only for 64-bit divide */ 1700d02842fSSascha Wildner 1710d02842fSSascha Wildner typedef struct uint64_struct 1720d02842fSSascha Wildner { 1730d02842fSSascha Wildner UINT32 Lo; 1740d02842fSSascha Wildner UINT32 Hi; 1750d02842fSSascha Wildner 1760d02842fSSascha Wildner } UINT64_STRUCT; 1770d02842fSSascha Wildner 1780d02842fSSascha Wildner typedef union uint64_overlay 1790d02842fSSascha Wildner { 1800d02842fSSascha Wildner UINT64 Full; 1810d02842fSSascha Wildner UINT64_STRUCT Part; 1820d02842fSSascha Wildner 1830d02842fSSascha Wildner } UINT64_OVERLAY; 1840d02842fSSascha Wildner 1850d02842fSSascha Wildner 1860d02842fSSascha Wildner /******************************************************************************* 1870d02842fSSascha Wildner * 1880d02842fSSascha Wildner * FUNCTION: AcpiUtShortDivide 1890d02842fSSascha Wildner * 1900d02842fSSascha Wildner * PARAMETERS: Dividend - 64-bit dividend 1910d02842fSSascha Wildner * Divisor - 32-bit divisor 1920d02842fSSascha Wildner * OutQuotient - Pointer to where the quotient is returned 1930d02842fSSascha Wildner * OutRemainder - Pointer to where the remainder is returned 1940d02842fSSascha Wildner * 1950d02842fSSascha Wildner * RETURN: Status (Checks for divide-by-zero) 1960d02842fSSascha Wildner * 1970d02842fSSascha Wildner * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits) 1980d02842fSSascha Wildner * divide and modulo. The result is a 64-bit quotient and a 1990d02842fSSascha Wildner * 32-bit remainder. 2000d02842fSSascha Wildner * 2010d02842fSSascha Wildner ******************************************************************************/ 2020d02842fSSascha Wildner 2030d02842fSSascha Wildner ACPI_STATUS 2040d02842fSSascha Wildner AcpiUtShortDivide ( 2050d02842fSSascha Wildner UINT64 Dividend, 2060d02842fSSascha Wildner UINT32 Divisor, 2070d02842fSSascha Wildner UINT64 *OutQuotient, 2080d02842fSSascha Wildner UINT32 *OutRemainder) 2090d02842fSSascha Wildner { 2100d02842fSSascha Wildner UINT64_OVERLAY DividendOvl; 2110d02842fSSascha Wildner UINT64_OVERLAY Quotient; 2120d02842fSSascha Wildner UINT32 Remainder32; 2130d02842fSSascha Wildner 2140d02842fSSascha Wildner 2150d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtShortDivide); 2160d02842fSSascha Wildner 2170d02842fSSascha Wildner 2180d02842fSSascha Wildner /* Always check for a zero divisor */ 2190d02842fSSascha Wildner 2200d02842fSSascha Wildner if (Divisor == 0) 2210d02842fSSascha Wildner { 2220d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 2230d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 2240d02842fSSascha Wildner } 2250d02842fSSascha Wildner 2260d02842fSSascha Wildner DividendOvl.Full = Dividend; 2270d02842fSSascha Wildner 2280d02842fSSascha Wildner /* 2290d02842fSSascha Wildner * The quotient is 64 bits, the remainder is always 32 bits, 2300d02842fSSascha Wildner * and is generated by the second divide. 2310d02842fSSascha Wildner */ 2320d02842fSSascha Wildner ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor, 2330d02842fSSascha Wildner Quotient.Part.Hi, Remainder32); 234820c5b08SSascha Wildner 2350d02842fSSascha Wildner ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor, 2360d02842fSSascha Wildner Quotient.Part.Lo, Remainder32); 2370d02842fSSascha Wildner 2380d02842fSSascha Wildner /* Return only what was requested */ 2390d02842fSSascha Wildner 2400d02842fSSascha Wildner if (OutQuotient) 2410d02842fSSascha Wildner { 2420d02842fSSascha Wildner *OutQuotient = Quotient.Full; 2430d02842fSSascha Wildner } 2440d02842fSSascha Wildner if (OutRemainder) 2450d02842fSSascha Wildner { 2460d02842fSSascha Wildner *OutRemainder = Remainder32; 2470d02842fSSascha Wildner } 2480d02842fSSascha Wildner 2490d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 2500d02842fSSascha Wildner } 2510d02842fSSascha Wildner 2520d02842fSSascha Wildner 2530d02842fSSascha Wildner /******************************************************************************* 2540d02842fSSascha Wildner * 2550d02842fSSascha Wildner * FUNCTION: AcpiUtDivide 2560d02842fSSascha Wildner * 2570d02842fSSascha Wildner * PARAMETERS: InDividend - Dividend 2580d02842fSSascha Wildner * InDivisor - Divisor 2590d02842fSSascha Wildner * OutQuotient - Pointer to where the quotient is returned 2600d02842fSSascha Wildner * OutRemainder - Pointer to where the remainder is returned 2610d02842fSSascha Wildner * 2620d02842fSSascha Wildner * RETURN: Status (Checks for divide-by-zero) 2630d02842fSSascha Wildner * 2640d02842fSSascha Wildner * DESCRIPTION: Perform a divide and modulo. 2650d02842fSSascha Wildner * 2660d02842fSSascha Wildner ******************************************************************************/ 2670d02842fSSascha Wildner 2680d02842fSSascha Wildner ACPI_STATUS 2690d02842fSSascha Wildner AcpiUtDivide ( 2700d02842fSSascha Wildner UINT64 InDividend, 2710d02842fSSascha Wildner UINT64 InDivisor, 2720d02842fSSascha Wildner UINT64 *OutQuotient, 2730d02842fSSascha Wildner UINT64 *OutRemainder) 2740d02842fSSascha Wildner { 2750d02842fSSascha Wildner UINT64_OVERLAY Dividend; 2760d02842fSSascha Wildner UINT64_OVERLAY Divisor; 2770d02842fSSascha Wildner UINT64_OVERLAY Quotient; 2780d02842fSSascha Wildner UINT64_OVERLAY Remainder; 2790d02842fSSascha Wildner UINT64_OVERLAY NormalizedDividend; 2800d02842fSSascha Wildner UINT64_OVERLAY NormalizedDivisor; 2810d02842fSSascha Wildner UINT32 Partial1; 2820d02842fSSascha Wildner UINT64_OVERLAY Partial2; 2830d02842fSSascha Wildner UINT64_OVERLAY Partial3; 2840d02842fSSascha Wildner 2850d02842fSSascha Wildner 2860d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtDivide); 2870d02842fSSascha Wildner 2880d02842fSSascha Wildner 2890d02842fSSascha Wildner /* Always check for a zero divisor */ 2900d02842fSSascha Wildner 2910d02842fSSascha Wildner if (InDivisor == 0) 2920d02842fSSascha Wildner { 2930d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 2940d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 2950d02842fSSascha Wildner } 2960d02842fSSascha Wildner 2970d02842fSSascha Wildner Divisor.Full = InDivisor; 2980d02842fSSascha Wildner Dividend.Full = InDividend; 2990d02842fSSascha Wildner if (Divisor.Part.Hi == 0) 3000d02842fSSascha Wildner { 3010d02842fSSascha Wildner /* 3020d02842fSSascha Wildner * 1) Simplest case is where the divisor is 32 bits, we can 3030d02842fSSascha Wildner * just do two divides 3040d02842fSSascha Wildner */ 3050d02842fSSascha Wildner Remainder.Part.Hi = 0; 3060d02842fSSascha Wildner 3070d02842fSSascha Wildner /* 3080d02842fSSascha Wildner * The quotient is 64 bits, the remainder is always 32 bits, 3090d02842fSSascha Wildner * and is generated by the second divide. 3100d02842fSSascha Wildner */ 3110d02842fSSascha Wildner ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo, 3120d02842fSSascha Wildner Quotient.Part.Hi, Partial1); 313820c5b08SSascha Wildner 3140d02842fSSascha Wildner ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo, 3150d02842fSSascha Wildner Quotient.Part.Lo, Remainder.Part.Lo); 3160d02842fSSascha Wildner } 3170d02842fSSascha Wildner 3180d02842fSSascha Wildner else 3190d02842fSSascha Wildner { 3200d02842fSSascha Wildner /* 3210d02842fSSascha Wildner * 2) The general case where the divisor is a full 64 bits 3220d02842fSSascha Wildner * is more difficult 3230d02842fSSascha Wildner */ 3240d02842fSSascha Wildner Quotient.Part.Hi = 0; 3250d02842fSSascha Wildner NormalizedDividend = Dividend; 3260d02842fSSascha Wildner NormalizedDivisor = Divisor; 3270d02842fSSascha Wildner 3280d02842fSSascha Wildner /* Normalize the operands (shift until the divisor is < 32 bits) */ 3290d02842fSSascha Wildner 3300d02842fSSascha Wildner do 3310d02842fSSascha Wildner { 332820c5b08SSascha Wildner ACPI_SHIFT_RIGHT_64 ( 333820c5b08SSascha Wildner NormalizedDivisor.Part.Hi, NormalizedDivisor.Part.Lo); 334820c5b08SSascha Wildner ACPI_SHIFT_RIGHT_64 ( 335820c5b08SSascha Wildner NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo); 3360d02842fSSascha Wildner 3370d02842fSSascha Wildner } while (NormalizedDivisor.Part.Hi != 0); 3380d02842fSSascha Wildner 3390d02842fSSascha Wildner /* Partial divide */ 3400d02842fSSascha Wildner 341820c5b08SSascha Wildner ACPI_DIV_64_BY_32 ( 342820c5b08SSascha Wildner NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo, 343820c5b08SSascha Wildner NormalizedDivisor.Part.Lo, Quotient.Part.Lo, Partial1); 3440d02842fSSascha Wildner 3450d02842fSSascha Wildner /* 346820c5b08SSascha Wildner * The quotient is always 32 bits, and simply requires 347820c5b08SSascha Wildner * adjustment. The 64-bit remainder must be generated. 3480d02842fSSascha Wildner */ 3490d02842fSSascha Wildner Partial1 = Quotient.Part.Lo * Divisor.Part.Hi; 3500d02842fSSascha Wildner Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo; 3510d02842fSSascha Wildner Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1; 3520d02842fSSascha Wildner 3530d02842fSSascha Wildner Remainder.Part.Hi = Partial3.Part.Lo; 3540d02842fSSascha Wildner Remainder.Part.Lo = Partial2.Part.Lo; 3550d02842fSSascha Wildner 3560d02842fSSascha Wildner if (Partial3.Part.Hi == 0) 3570d02842fSSascha Wildner { 3580d02842fSSascha Wildner if (Partial3.Part.Lo >= Dividend.Part.Hi) 3590d02842fSSascha Wildner { 3600d02842fSSascha Wildner if (Partial3.Part.Lo == Dividend.Part.Hi) 3610d02842fSSascha Wildner { 3620d02842fSSascha Wildner if (Partial2.Part.Lo > Dividend.Part.Lo) 3630d02842fSSascha Wildner { 3640d02842fSSascha Wildner Quotient.Part.Lo--; 3650d02842fSSascha Wildner Remainder.Full -= Divisor.Full; 3660d02842fSSascha Wildner } 3670d02842fSSascha Wildner } 3680d02842fSSascha Wildner else 3690d02842fSSascha Wildner { 3700d02842fSSascha Wildner Quotient.Part.Lo--; 3710d02842fSSascha Wildner Remainder.Full -= Divisor.Full; 3720d02842fSSascha Wildner } 3730d02842fSSascha Wildner } 3740d02842fSSascha Wildner 3750d02842fSSascha Wildner Remainder.Full = Remainder.Full - Dividend.Full; 3760d02842fSSascha Wildner Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi); 3770d02842fSSascha Wildner Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo); 3780d02842fSSascha Wildner 3790d02842fSSascha Wildner if (Remainder.Part.Lo) 3800d02842fSSascha Wildner { 3810d02842fSSascha Wildner Remainder.Part.Hi--; 3820d02842fSSascha Wildner } 3830d02842fSSascha Wildner } 3840d02842fSSascha Wildner } 3850d02842fSSascha Wildner 3860d02842fSSascha Wildner /* Return only what was requested */ 3870d02842fSSascha Wildner 3880d02842fSSascha Wildner if (OutQuotient) 3890d02842fSSascha Wildner { 3900d02842fSSascha Wildner *OutQuotient = Quotient.Full; 3910d02842fSSascha Wildner } 3920d02842fSSascha Wildner if (OutRemainder) 3930d02842fSSascha Wildner { 3940d02842fSSascha Wildner *OutRemainder = Remainder.Full; 3950d02842fSSascha Wildner } 3960d02842fSSascha Wildner 3970d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 3980d02842fSSascha Wildner } 3990d02842fSSascha Wildner 4000d02842fSSascha Wildner #else 4010d02842fSSascha Wildner 4020d02842fSSascha Wildner /******************************************************************************* 4030d02842fSSascha Wildner * 4040d02842fSSascha Wildner * FUNCTION: AcpiUtShortDivide, AcpiUtDivide 4050d02842fSSascha Wildner * 4060d02842fSSascha Wildner * PARAMETERS: See function headers above 4070d02842fSSascha Wildner * 4080d02842fSSascha Wildner * DESCRIPTION: Native versions of the UtDivide functions. Use these if either 4090d02842fSSascha Wildner * 1) The target is a 64-bit platform and therefore 64-bit 4100d02842fSSascha Wildner * integer math is supported directly by the machine. 4110d02842fSSascha Wildner * 2) The target is a 32-bit or 16-bit platform, and the 4120d02842fSSascha Wildner * double-precision integer math library is available to 4130d02842fSSascha Wildner * perform the divide. 4140d02842fSSascha Wildner * 4150d02842fSSascha Wildner ******************************************************************************/ 4160d02842fSSascha Wildner 4170d02842fSSascha Wildner ACPI_STATUS 4180d02842fSSascha Wildner AcpiUtShortDivide ( 4190d02842fSSascha Wildner UINT64 InDividend, 4200d02842fSSascha Wildner UINT32 Divisor, 4210d02842fSSascha Wildner UINT64 *OutQuotient, 4220d02842fSSascha Wildner UINT32 *OutRemainder) 4230d02842fSSascha Wildner { 4240d02842fSSascha Wildner 4250d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtShortDivide); 4260d02842fSSascha Wildner 4270d02842fSSascha Wildner 4280d02842fSSascha Wildner /* Always check for a zero divisor */ 4290d02842fSSascha Wildner 4300d02842fSSascha Wildner if (Divisor == 0) 4310d02842fSSascha Wildner { 4320d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 4330d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 4340d02842fSSascha Wildner } 4350d02842fSSascha Wildner 4360d02842fSSascha Wildner /* Return only what was requested */ 4370d02842fSSascha Wildner 4380d02842fSSascha Wildner if (OutQuotient) 4390d02842fSSascha Wildner { 4400d02842fSSascha Wildner *OutQuotient = InDividend / Divisor; 4410d02842fSSascha Wildner } 4420d02842fSSascha Wildner if (OutRemainder) 4430d02842fSSascha Wildner { 4440d02842fSSascha Wildner *OutRemainder = (UINT32) (InDividend % Divisor); 4450d02842fSSascha Wildner } 4460d02842fSSascha Wildner 4470d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 4480d02842fSSascha Wildner } 4490d02842fSSascha Wildner 4500d02842fSSascha Wildner ACPI_STATUS 4510d02842fSSascha Wildner AcpiUtDivide ( 4520d02842fSSascha Wildner UINT64 InDividend, 4530d02842fSSascha Wildner UINT64 InDivisor, 4540d02842fSSascha Wildner UINT64 *OutQuotient, 4550d02842fSSascha Wildner UINT64 *OutRemainder) 4560d02842fSSascha Wildner { 4570d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtDivide); 4580d02842fSSascha Wildner 4590d02842fSSascha Wildner 4600d02842fSSascha Wildner /* Always check for a zero divisor */ 4610d02842fSSascha Wildner 4620d02842fSSascha Wildner if (InDivisor == 0) 4630d02842fSSascha Wildner { 4640d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 4650d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 4660d02842fSSascha Wildner } 4670d02842fSSascha Wildner 4680d02842fSSascha Wildner 4690d02842fSSascha Wildner /* Return only what was requested */ 4700d02842fSSascha Wildner 4710d02842fSSascha Wildner if (OutQuotient) 4720d02842fSSascha Wildner { 4730d02842fSSascha Wildner *OutQuotient = InDividend / InDivisor; 4740d02842fSSascha Wildner } 4750d02842fSSascha Wildner if (OutRemainder) 4760d02842fSSascha Wildner { 4770d02842fSSascha Wildner *OutRemainder = InDividend % InDivisor; 4780d02842fSSascha Wildner } 4790d02842fSSascha Wildner 4800d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 4810d02842fSSascha Wildner } 4820d02842fSSascha Wildner 4830d02842fSSascha Wildner #endif 484