10d02842fSSascha Wildner /******************************************************************************* 20d02842fSSascha Wildner * 30d02842fSSascha Wildner * Module Name: utmath - Integer math support routines 40d02842fSSascha Wildner * 50d02842fSSascha Wildner ******************************************************************************/ 60d02842fSSascha Wildner 7b4315fc7SSascha Wildner /****************************************************************************** 8b4315fc7SSascha Wildner * 9b4315fc7SSascha Wildner * 1. Copyright Notice 10b4315fc7SSascha Wildner * 11b4315fc7SSascha Wildner * Some or all of this work - Copyright (c) 1999 - 2017, Intel Corp. 120d02842fSSascha Wildner * All rights reserved. 130d02842fSSascha Wildner * 14b4315fc7SSascha Wildner * 2. License 15b4315fc7SSascha Wildner * 16b4315fc7SSascha Wildner * 2.1. This is your license from Intel Corp. under its intellectual property 17b4315fc7SSascha Wildner * rights. You may have additional license terms from the party that provided 18b4315fc7SSascha Wildner * you this software, covering your right to use that party's intellectual 19b4315fc7SSascha Wildner * property rights. 20b4315fc7SSascha Wildner * 21b4315fc7SSascha Wildner * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a 22b4315fc7SSascha Wildner * copy of the source code appearing in this file ("Covered Code") an 23b4315fc7SSascha Wildner * irrevocable, perpetual, worldwide license under Intel's copyrights in the 24b4315fc7SSascha Wildner * base code distributed originally by Intel ("Original Intel Code") to copy, 25b4315fc7SSascha Wildner * make derivatives, distribute, use and display any portion of the Covered 26b4315fc7SSascha Wildner * Code in any form, with the right to sublicense such rights; and 27b4315fc7SSascha Wildner * 28b4315fc7SSascha Wildner * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent 29b4315fc7SSascha Wildner * license (with the right to sublicense), under only those claims of Intel 30b4315fc7SSascha Wildner * patents that are infringed by the Original Intel Code, to make, use, sell, 31b4315fc7SSascha Wildner * offer to sell, and import the Covered Code and derivative works thereof 32b4315fc7SSascha Wildner * solely to the minimum extent necessary to exercise the above copyright 33b4315fc7SSascha Wildner * license, and in no event shall the patent license extend to any additions 34b4315fc7SSascha Wildner * to or modifications of the Original Intel Code. No other license or right 35b4315fc7SSascha Wildner * is granted directly or by implication, estoppel or otherwise; 36b4315fc7SSascha Wildner * 37b4315fc7SSascha Wildner * The above copyright and patent license is granted only if the following 38b4315fc7SSascha Wildner * conditions are met: 39b4315fc7SSascha Wildner * 40b4315fc7SSascha Wildner * 3. Conditions 41b4315fc7SSascha Wildner * 42b4315fc7SSascha Wildner * 3.1. Redistribution of Source with Rights to Further Distribute Source. 43b4315fc7SSascha Wildner * Redistribution of source code of any substantial portion of the Covered 44b4315fc7SSascha Wildner * Code or modification with rights to further distribute source must include 45b4315fc7SSascha Wildner * the above Copyright Notice, the above License, this list of Conditions, 46b4315fc7SSascha Wildner * and the following Disclaimer and Export Compliance provision. In addition, 47b4315fc7SSascha Wildner * Licensee must cause all Covered Code to which Licensee contributes to 48b4315fc7SSascha Wildner * contain a file documenting the changes Licensee made to create that Covered 49b4315fc7SSascha Wildner * Code and the date of any change. Licensee must include in that file the 50b4315fc7SSascha Wildner * documentation of any changes made by any predecessor Licensee. Licensee 51b4315fc7SSascha Wildner * must include a prominent statement that the modification is derived, 52b4315fc7SSascha Wildner * directly or indirectly, from Original Intel Code. 53b4315fc7SSascha Wildner * 54b4315fc7SSascha Wildner * 3.2. Redistribution of Source with no Rights to Further Distribute Source. 55b4315fc7SSascha Wildner * Redistribution of source code of any substantial portion of the Covered 56b4315fc7SSascha Wildner * Code or modification without rights to further distribute source must 57b4315fc7SSascha Wildner * include the following Disclaimer and Export Compliance provision in the 58b4315fc7SSascha Wildner * documentation and/or other materials provided with distribution. In 59b4315fc7SSascha Wildner * addition, Licensee may not authorize further sublicense of source of any 60b4315fc7SSascha Wildner * portion of the Covered Code, and must include terms to the effect that the 61b4315fc7SSascha Wildner * license from Licensee to its licensee is limited to the intellectual 62b4315fc7SSascha Wildner * property embodied in the software Licensee provides to its licensee, and 63b4315fc7SSascha Wildner * not to intellectual property embodied in modifications its licensee may 64b4315fc7SSascha Wildner * make. 65b4315fc7SSascha Wildner * 66b4315fc7SSascha Wildner * 3.3. Redistribution of Executable. Redistribution in executable form of any 67b4315fc7SSascha Wildner * substantial portion of the Covered Code or modification must reproduce the 68b4315fc7SSascha Wildner * above Copyright Notice, and the following Disclaimer and Export Compliance 69b4315fc7SSascha Wildner * provision in the documentation and/or other materials provided with the 70b4315fc7SSascha Wildner * distribution. 71b4315fc7SSascha Wildner * 72b4315fc7SSascha Wildner * 3.4. Intel retains all right, title, and interest in and to the Original 73b4315fc7SSascha Wildner * Intel Code. 74b4315fc7SSascha Wildner * 75b4315fc7SSascha Wildner * 3.5. Neither the name Intel nor any other trademark owned or controlled by 76b4315fc7SSascha Wildner * Intel shall be used in advertising or otherwise to promote the sale, use or 77b4315fc7SSascha Wildner * other dealings in products derived from or relating to the Covered Code 78b4315fc7SSascha Wildner * without prior written authorization from Intel. 79b4315fc7SSascha Wildner * 80b4315fc7SSascha Wildner * 4. Disclaimer and Export Compliance 81b4315fc7SSascha Wildner * 82b4315fc7SSascha Wildner * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED 83b4315fc7SSascha Wildner * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE 84b4315fc7SSascha Wildner * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, 85b4315fc7SSascha Wildner * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY 86b4315fc7SSascha Wildner * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY 87b4315fc7SSascha Wildner * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A 88b4315fc7SSascha Wildner * PARTICULAR PURPOSE. 89b4315fc7SSascha Wildner * 90b4315fc7SSascha Wildner * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES 91b4315fc7SSascha Wildner * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR 92b4315fc7SSascha Wildner * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, 93b4315fc7SSascha Wildner * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY 94b4315fc7SSascha Wildner * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL 95b4315fc7SSascha Wildner * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS 96b4315fc7SSascha Wildner * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY 97b4315fc7SSascha Wildner * LIMITED REMEDY. 98b4315fc7SSascha Wildner * 99b4315fc7SSascha Wildner * 4.3. Licensee shall not export, either directly or indirectly, any of this 100b4315fc7SSascha Wildner * software or system incorporating such software without first obtaining any 101b4315fc7SSascha Wildner * required license or other approval from the U. S. Department of Commerce or 102b4315fc7SSascha Wildner * any other agency or department of the United States Government. In the 103b4315fc7SSascha Wildner * event Licensee exports any such software from the United States or 104b4315fc7SSascha Wildner * re-exports any such software from a foreign destination, Licensee shall 105b4315fc7SSascha Wildner * ensure that the distribution and export/re-export of the software is in 106b4315fc7SSascha Wildner * compliance with all laws, regulations, orders, or other restrictions of the 107b4315fc7SSascha Wildner * U.S. Export Administration Regulations. Licensee agrees that neither it nor 108b4315fc7SSascha Wildner * any of its subsidiaries will export/re-export any technical data, process, 109b4315fc7SSascha Wildner * software, or service, directly or indirectly, to any country for which the 110b4315fc7SSascha Wildner * United States government or any agency thereof requires an export license, 111b4315fc7SSascha Wildner * other governmental approval, or letter of assurance, without first obtaining 112b4315fc7SSascha Wildner * such license, approval or letter. 113b4315fc7SSascha Wildner * 114b4315fc7SSascha Wildner ***************************************************************************** 115b4315fc7SSascha Wildner * 116b4315fc7SSascha Wildner * Alternatively, you may choose to be licensed under the terms of the 117b4315fc7SSascha Wildner * following license: 118b4315fc7SSascha 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 * 134b4315fc7SSascha Wildner * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 135b4315fc7SSascha Wildner * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 136b4315fc7SSascha Wildner * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 137b4315fc7SSascha Wildner * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 138b4315fc7SSascha Wildner * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 139b4315fc7SSascha Wildner * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 140b4315fc7SSascha Wildner * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 141b4315fc7SSascha Wildner * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 142b4315fc7SSascha Wildner * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 143b4315fc7SSascha Wildner * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 144b4315fc7SSascha Wildner * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 145b4315fc7SSascha Wildner * 146b4315fc7SSascha 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 * 150b4315fc7SSascha 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 /* Structures used only for 64-bit divide */ 1600d02842fSSascha Wildner 1610d02842fSSascha Wildner typedef struct uint64_struct 1620d02842fSSascha Wildner { 1630d02842fSSascha Wildner UINT32 Lo; 1640d02842fSSascha Wildner UINT32 Hi; 1650d02842fSSascha Wildner 1660d02842fSSascha Wildner } UINT64_STRUCT; 1670d02842fSSascha Wildner 1680d02842fSSascha Wildner typedef union uint64_overlay 1690d02842fSSascha Wildner { 1700d02842fSSascha Wildner UINT64 Full; 1710d02842fSSascha Wildner UINT64_STRUCT Part; 1720d02842fSSascha Wildner 1730d02842fSSascha Wildner } UINT64_OVERLAY; 1740d02842fSSascha Wildner 175*3c639e0cSSascha Wildner /* 176*3c639e0cSSascha Wildner * Optional support for 64-bit double-precision integer multiply and shift. 177*3c639e0cSSascha Wildner * This code is configurable and is implemented in order to support 32-bit 178*3c639e0cSSascha Wildner * kernel environments where a 64-bit double-precision math library is not 179*3c639e0cSSascha Wildner * available. 180*3c639e0cSSascha Wildner */ 181*3c639e0cSSascha Wildner #ifndef ACPI_USE_NATIVE_MATH64 182*3c639e0cSSascha Wildner 183*3c639e0cSSascha Wildner /******************************************************************************* 184*3c639e0cSSascha Wildner * 185*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortMultiply 186*3c639e0cSSascha Wildner * 187*3c639e0cSSascha Wildner * PARAMETERS: Multiplicand - 64-bit multiplicand 188*3c639e0cSSascha Wildner * Multiplier - 32-bit multiplier 189*3c639e0cSSascha Wildner * OutProduct - Pointer to where the product is returned 190*3c639e0cSSascha Wildner * 191*3c639e0cSSascha Wildner * DESCRIPTION: Perform a short multiply. 192*3c639e0cSSascha Wildner * 193*3c639e0cSSascha Wildner ******************************************************************************/ 194*3c639e0cSSascha Wildner 195*3c639e0cSSascha Wildner ACPI_STATUS 196*3c639e0cSSascha Wildner AcpiUtShortMultiply ( 197*3c639e0cSSascha Wildner UINT64 Multiplicand, 198*3c639e0cSSascha Wildner UINT32 Multiplier, 199*3c639e0cSSascha Wildner UINT64 *OutProduct) 200*3c639e0cSSascha Wildner { 201*3c639e0cSSascha Wildner UINT64_OVERLAY MultiplicandOvl; 202*3c639e0cSSascha Wildner UINT64_OVERLAY Product; 203*3c639e0cSSascha Wildner UINT32 Carry32; 204*3c639e0cSSascha Wildner 205*3c639e0cSSascha Wildner 206*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortMultiply); 207*3c639e0cSSascha Wildner 208*3c639e0cSSascha Wildner 209*3c639e0cSSascha Wildner MultiplicandOvl.Full = Multiplicand; 210*3c639e0cSSascha Wildner 211*3c639e0cSSascha Wildner /* 212*3c639e0cSSascha Wildner * The Product is 64 bits, the carry is always 32 bits, 213*3c639e0cSSascha Wildner * and is generated by the second multiply. 214*3c639e0cSSascha Wildner */ 215*3c639e0cSSascha Wildner ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Hi, Multiplier, 216*3c639e0cSSascha Wildner Product.Part.Hi, Carry32); 217*3c639e0cSSascha Wildner 218*3c639e0cSSascha Wildner ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Lo, Multiplier, 219*3c639e0cSSascha Wildner Product.Part.Lo, Carry32); 220*3c639e0cSSascha Wildner 221*3c639e0cSSascha Wildner Product.Part.Hi += Carry32; 222*3c639e0cSSascha Wildner 223*3c639e0cSSascha Wildner /* Return only what was requested */ 224*3c639e0cSSascha Wildner 225*3c639e0cSSascha Wildner if (OutProduct) 226*3c639e0cSSascha Wildner { 227*3c639e0cSSascha Wildner *OutProduct = Product.Full; 228*3c639e0cSSascha Wildner } 229*3c639e0cSSascha Wildner 230*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 231*3c639e0cSSascha Wildner } 232*3c639e0cSSascha Wildner 233*3c639e0cSSascha Wildner 234*3c639e0cSSascha Wildner /******************************************************************************* 235*3c639e0cSSascha Wildner * 236*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftLeft 237*3c639e0cSSascha Wildner * 238*3c639e0cSSascha Wildner * PARAMETERS: Operand - 64-bit shift operand 239*3c639e0cSSascha Wildner * Count - 32-bit shift count 240*3c639e0cSSascha Wildner * OutResult - Pointer to where the result is returned 241*3c639e0cSSascha Wildner * 242*3c639e0cSSascha Wildner * DESCRIPTION: Perform a short left shift. 243*3c639e0cSSascha Wildner * 244*3c639e0cSSascha Wildner ******************************************************************************/ 245*3c639e0cSSascha Wildner 246*3c639e0cSSascha Wildner ACPI_STATUS 247*3c639e0cSSascha Wildner AcpiUtShortShiftLeft ( 248*3c639e0cSSascha Wildner UINT64 Operand, 249*3c639e0cSSascha Wildner UINT32 Count, 250*3c639e0cSSascha Wildner UINT64 *OutResult) 251*3c639e0cSSascha Wildner { 252*3c639e0cSSascha Wildner UINT64_OVERLAY OperandOvl; 253*3c639e0cSSascha Wildner 254*3c639e0cSSascha Wildner 255*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftLeft); 256*3c639e0cSSascha Wildner 257*3c639e0cSSascha Wildner 258*3c639e0cSSascha Wildner OperandOvl.Full = Operand; 259*3c639e0cSSascha Wildner 260*3c639e0cSSascha Wildner if ((Count & 63) >= 32) 261*3c639e0cSSascha Wildner { 262*3c639e0cSSascha Wildner OperandOvl.Part.Hi = OperandOvl.Part.Lo; 263*3c639e0cSSascha Wildner OperandOvl.Part.Lo ^= OperandOvl.Part.Lo; 264*3c639e0cSSascha Wildner Count = (Count & 63) - 32; 265*3c639e0cSSascha Wildner } 266*3c639e0cSSascha Wildner ACPI_SHIFT_LEFT_64_BY_32 (OperandOvl.Part.Hi, 267*3c639e0cSSascha Wildner OperandOvl.Part.Lo, Count); 268*3c639e0cSSascha Wildner 269*3c639e0cSSascha Wildner /* Return only what was requested */ 270*3c639e0cSSascha Wildner 271*3c639e0cSSascha Wildner if (OutResult) 272*3c639e0cSSascha Wildner { 273*3c639e0cSSascha Wildner *OutResult = OperandOvl.Full; 274*3c639e0cSSascha Wildner } 275*3c639e0cSSascha Wildner 276*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 277*3c639e0cSSascha Wildner } 278*3c639e0cSSascha Wildner 279*3c639e0cSSascha Wildner /******************************************************************************* 280*3c639e0cSSascha Wildner * 281*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftRight 282*3c639e0cSSascha Wildner * 283*3c639e0cSSascha Wildner * PARAMETERS: Operand - 64-bit shift operand 284*3c639e0cSSascha Wildner * Count - 32-bit shift count 285*3c639e0cSSascha Wildner * OutResult - Pointer to where the result is returned 286*3c639e0cSSascha Wildner * 287*3c639e0cSSascha Wildner * DESCRIPTION: Perform a short right shift. 288*3c639e0cSSascha Wildner * 289*3c639e0cSSascha Wildner ******************************************************************************/ 290*3c639e0cSSascha Wildner 291*3c639e0cSSascha Wildner ACPI_STATUS 292*3c639e0cSSascha Wildner AcpiUtShortShiftRight ( 293*3c639e0cSSascha Wildner UINT64 Operand, 294*3c639e0cSSascha Wildner UINT32 Count, 295*3c639e0cSSascha Wildner UINT64 *OutResult) 296*3c639e0cSSascha Wildner { 297*3c639e0cSSascha Wildner UINT64_OVERLAY OperandOvl; 298*3c639e0cSSascha Wildner 299*3c639e0cSSascha Wildner 300*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftRight); 301*3c639e0cSSascha Wildner 302*3c639e0cSSascha Wildner 303*3c639e0cSSascha Wildner OperandOvl.Full = Operand; 304*3c639e0cSSascha Wildner 305*3c639e0cSSascha Wildner if ((Count & 63) >= 32) 306*3c639e0cSSascha Wildner { 307*3c639e0cSSascha Wildner OperandOvl.Part.Lo = OperandOvl.Part.Hi; 308*3c639e0cSSascha Wildner OperandOvl.Part.Hi ^= OperandOvl.Part.Hi; 309*3c639e0cSSascha Wildner Count = (Count & 63) - 32; 310*3c639e0cSSascha Wildner } 311*3c639e0cSSascha Wildner ACPI_SHIFT_RIGHT_64_BY_32 (OperandOvl.Part.Hi, 312*3c639e0cSSascha Wildner OperandOvl.Part.Lo, Count); 313*3c639e0cSSascha Wildner 314*3c639e0cSSascha Wildner /* Return only what was requested */ 315*3c639e0cSSascha Wildner 316*3c639e0cSSascha Wildner if (OutResult) 317*3c639e0cSSascha Wildner { 318*3c639e0cSSascha Wildner *OutResult = OperandOvl.Full; 319*3c639e0cSSascha Wildner } 320*3c639e0cSSascha Wildner 321*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 322*3c639e0cSSascha Wildner } 323*3c639e0cSSascha Wildner #else 324*3c639e0cSSascha Wildner 325*3c639e0cSSascha Wildner /******************************************************************************* 326*3c639e0cSSascha Wildner * 327*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortMultiply 328*3c639e0cSSascha Wildner * 329*3c639e0cSSascha Wildner * PARAMETERS: See function headers above 330*3c639e0cSSascha Wildner * 331*3c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortMultiply function. 332*3c639e0cSSascha Wildner * 333*3c639e0cSSascha Wildner ******************************************************************************/ 334*3c639e0cSSascha Wildner 335*3c639e0cSSascha Wildner ACPI_STATUS 336*3c639e0cSSascha Wildner AcpiUtShortMultiply ( 337*3c639e0cSSascha Wildner UINT64 Multiplicand, 338*3c639e0cSSascha Wildner UINT32 Multiplier, 339*3c639e0cSSascha Wildner UINT64 *OutProduct) 340*3c639e0cSSascha Wildner { 341*3c639e0cSSascha Wildner 342*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortMultiply); 343*3c639e0cSSascha Wildner 344*3c639e0cSSascha Wildner 345*3c639e0cSSascha Wildner /* Return only what was requested */ 346*3c639e0cSSascha Wildner 347*3c639e0cSSascha Wildner if (OutProduct) 348*3c639e0cSSascha Wildner { 349*3c639e0cSSascha Wildner *OutProduct = Multiplicand * Multiplier; 350*3c639e0cSSascha Wildner } 351*3c639e0cSSascha Wildner 352*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 353*3c639e0cSSascha Wildner } 354*3c639e0cSSascha Wildner 355*3c639e0cSSascha Wildner /******************************************************************************* 356*3c639e0cSSascha Wildner * 357*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftLeft 358*3c639e0cSSascha Wildner * 359*3c639e0cSSascha Wildner * PARAMETERS: See function headers above 360*3c639e0cSSascha Wildner * 361*3c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortShiftLeft function. 362*3c639e0cSSascha Wildner * 363*3c639e0cSSascha Wildner ******************************************************************************/ 364*3c639e0cSSascha Wildner 365*3c639e0cSSascha Wildner ACPI_STATUS 366*3c639e0cSSascha Wildner AcpiUtShortShiftLeft ( 367*3c639e0cSSascha Wildner UINT64 Operand, 368*3c639e0cSSascha Wildner UINT32 Count, 369*3c639e0cSSascha Wildner UINT64 *OutResult) 370*3c639e0cSSascha Wildner { 371*3c639e0cSSascha Wildner 372*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftLeft); 373*3c639e0cSSascha Wildner 374*3c639e0cSSascha Wildner 375*3c639e0cSSascha Wildner /* Return only what was requested */ 376*3c639e0cSSascha Wildner 377*3c639e0cSSascha Wildner if (OutResult) 378*3c639e0cSSascha Wildner { 379*3c639e0cSSascha Wildner *OutResult = Operand << Count; 380*3c639e0cSSascha Wildner } 381*3c639e0cSSascha Wildner 382*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 383*3c639e0cSSascha Wildner } 384*3c639e0cSSascha Wildner 385*3c639e0cSSascha Wildner /******************************************************************************* 386*3c639e0cSSascha Wildner * 387*3c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftRight 388*3c639e0cSSascha Wildner * 389*3c639e0cSSascha Wildner * PARAMETERS: See function headers above 390*3c639e0cSSascha Wildner * 391*3c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortShiftRight function. 392*3c639e0cSSascha Wildner * 393*3c639e0cSSascha Wildner ******************************************************************************/ 394*3c639e0cSSascha Wildner 395*3c639e0cSSascha Wildner ACPI_STATUS 396*3c639e0cSSascha Wildner AcpiUtShortShiftRight ( 397*3c639e0cSSascha Wildner UINT64 Operand, 398*3c639e0cSSascha Wildner UINT32 Count, 399*3c639e0cSSascha Wildner UINT64 *OutResult) 400*3c639e0cSSascha Wildner { 401*3c639e0cSSascha Wildner 402*3c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftRight); 403*3c639e0cSSascha Wildner 404*3c639e0cSSascha Wildner 405*3c639e0cSSascha Wildner /* Return only what was requested */ 406*3c639e0cSSascha Wildner 407*3c639e0cSSascha Wildner if (OutResult) 408*3c639e0cSSascha Wildner { 409*3c639e0cSSascha Wildner *OutResult = Operand >> Count; 410*3c639e0cSSascha Wildner } 411*3c639e0cSSascha Wildner 412*3c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK); 413*3c639e0cSSascha Wildner } 414*3c639e0cSSascha Wildner #endif 415*3c639e0cSSascha Wildner 416*3c639e0cSSascha Wildner /* 417*3c639e0cSSascha Wildner * Optional support for 64-bit double-precision integer divide. This code 418*3c639e0cSSascha Wildner * is configurable and is implemented in order to support 32-bit kernel 419*3c639e0cSSascha Wildner * environments where a 64-bit double-precision math library is not available. 420*3c639e0cSSascha Wildner * 421*3c639e0cSSascha Wildner * Support for a more normal 64-bit divide/modulo (with check for a divide- 422*3c639e0cSSascha Wildner * by-zero) appears after this optional section of code. 423*3c639e0cSSascha Wildner */ 424*3c639e0cSSascha Wildner #ifndef ACPI_USE_NATIVE_DIVIDE 425*3c639e0cSSascha Wildner 4260d02842fSSascha Wildner 4270d02842fSSascha Wildner /******************************************************************************* 4280d02842fSSascha Wildner * 4290d02842fSSascha Wildner * FUNCTION: AcpiUtShortDivide 4300d02842fSSascha Wildner * 4310d02842fSSascha Wildner * PARAMETERS: Dividend - 64-bit dividend 4320d02842fSSascha Wildner * Divisor - 32-bit divisor 4330d02842fSSascha Wildner * OutQuotient - Pointer to where the quotient is returned 4340d02842fSSascha Wildner * OutRemainder - Pointer to where the remainder is returned 4350d02842fSSascha Wildner * 4360d02842fSSascha Wildner * RETURN: Status (Checks for divide-by-zero) 4370d02842fSSascha Wildner * 4380d02842fSSascha Wildner * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits) 4390d02842fSSascha Wildner * divide and modulo. The result is a 64-bit quotient and a 4400d02842fSSascha Wildner * 32-bit remainder. 4410d02842fSSascha Wildner * 4420d02842fSSascha Wildner ******************************************************************************/ 4430d02842fSSascha Wildner 4440d02842fSSascha Wildner ACPI_STATUS 4450d02842fSSascha Wildner AcpiUtShortDivide ( 4460d02842fSSascha Wildner UINT64 Dividend, 4470d02842fSSascha Wildner UINT32 Divisor, 4480d02842fSSascha Wildner UINT64 *OutQuotient, 4490d02842fSSascha Wildner UINT32 *OutRemainder) 4500d02842fSSascha Wildner { 4510d02842fSSascha Wildner UINT64_OVERLAY DividendOvl; 4520d02842fSSascha Wildner UINT64_OVERLAY Quotient; 4530d02842fSSascha Wildner UINT32 Remainder32; 4540d02842fSSascha Wildner 4550d02842fSSascha Wildner 4560d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtShortDivide); 4570d02842fSSascha Wildner 4580d02842fSSascha Wildner 4590d02842fSSascha Wildner /* Always check for a zero divisor */ 4600d02842fSSascha Wildner 4610d02842fSSascha Wildner if (Divisor == 0) 4620d02842fSSascha Wildner { 4630d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 4640d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 4650d02842fSSascha Wildner } 4660d02842fSSascha Wildner 4670d02842fSSascha Wildner DividendOvl.Full = Dividend; 4680d02842fSSascha Wildner 4690d02842fSSascha Wildner /* 4700d02842fSSascha Wildner * The quotient is 64 bits, the remainder is always 32 bits, 4710d02842fSSascha Wildner * and is generated by the second divide. 4720d02842fSSascha Wildner */ 4730d02842fSSascha Wildner ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor, 4740d02842fSSascha Wildner Quotient.Part.Hi, Remainder32); 475820c5b08SSascha Wildner 4760d02842fSSascha Wildner ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor, 4770d02842fSSascha Wildner Quotient.Part.Lo, Remainder32); 4780d02842fSSascha Wildner 4790d02842fSSascha Wildner /* Return only what was requested */ 4800d02842fSSascha Wildner 4810d02842fSSascha Wildner if (OutQuotient) 4820d02842fSSascha Wildner { 4830d02842fSSascha Wildner *OutQuotient = Quotient.Full; 4840d02842fSSascha Wildner } 4850d02842fSSascha Wildner if (OutRemainder) 4860d02842fSSascha Wildner { 4870d02842fSSascha Wildner *OutRemainder = Remainder32; 4880d02842fSSascha Wildner } 4890d02842fSSascha Wildner 4900d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 4910d02842fSSascha Wildner } 4920d02842fSSascha Wildner 4930d02842fSSascha Wildner 4940d02842fSSascha Wildner /******************************************************************************* 4950d02842fSSascha Wildner * 4960d02842fSSascha Wildner * FUNCTION: AcpiUtDivide 4970d02842fSSascha Wildner * 4980d02842fSSascha Wildner * PARAMETERS: InDividend - Dividend 4990d02842fSSascha Wildner * InDivisor - Divisor 5000d02842fSSascha Wildner * OutQuotient - Pointer to where the quotient is returned 5010d02842fSSascha Wildner * OutRemainder - Pointer to where the remainder is returned 5020d02842fSSascha Wildner * 5030d02842fSSascha Wildner * RETURN: Status (Checks for divide-by-zero) 5040d02842fSSascha Wildner * 5050d02842fSSascha Wildner * DESCRIPTION: Perform a divide and modulo. 5060d02842fSSascha Wildner * 5070d02842fSSascha Wildner ******************************************************************************/ 5080d02842fSSascha Wildner 5090d02842fSSascha Wildner ACPI_STATUS 5100d02842fSSascha Wildner AcpiUtDivide ( 5110d02842fSSascha Wildner UINT64 InDividend, 5120d02842fSSascha Wildner UINT64 InDivisor, 5130d02842fSSascha Wildner UINT64 *OutQuotient, 5140d02842fSSascha Wildner UINT64 *OutRemainder) 5150d02842fSSascha Wildner { 5160d02842fSSascha Wildner UINT64_OVERLAY Dividend; 5170d02842fSSascha Wildner UINT64_OVERLAY Divisor; 5180d02842fSSascha Wildner UINT64_OVERLAY Quotient; 5190d02842fSSascha Wildner UINT64_OVERLAY Remainder; 5200d02842fSSascha Wildner UINT64_OVERLAY NormalizedDividend; 5210d02842fSSascha Wildner UINT64_OVERLAY NormalizedDivisor; 5220d02842fSSascha Wildner UINT32 Partial1; 5230d02842fSSascha Wildner UINT64_OVERLAY Partial2; 5240d02842fSSascha Wildner UINT64_OVERLAY Partial3; 5250d02842fSSascha Wildner 5260d02842fSSascha Wildner 5270d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtDivide); 5280d02842fSSascha Wildner 5290d02842fSSascha Wildner 5300d02842fSSascha Wildner /* Always check for a zero divisor */ 5310d02842fSSascha Wildner 5320d02842fSSascha Wildner if (InDivisor == 0) 5330d02842fSSascha Wildner { 5340d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 5350d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 5360d02842fSSascha Wildner } 5370d02842fSSascha Wildner 5380d02842fSSascha Wildner Divisor.Full = InDivisor; 5390d02842fSSascha Wildner Dividend.Full = InDividend; 5400d02842fSSascha Wildner if (Divisor.Part.Hi == 0) 5410d02842fSSascha Wildner { 5420d02842fSSascha Wildner /* 5430d02842fSSascha Wildner * 1) Simplest case is where the divisor is 32 bits, we can 5440d02842fSSascha Wildner * just do two divides 5450d02842fSSascha Wildner */ 5460d02842fSSascha Wildner Remainder.Part.Hi = 0; 5470d02842fSSascha Wildner 5480d02842fSSascha Wildner /* 5490d02842fSSascha Wildner * The quotient is 64 bits, the remainder is always 32 bits, 5500d02842fSSascha Wildner * and is generated by the second divide. 5510d02842fSSascha Wildner */ 5520d02842fSSascha Wildner ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo, 5530d02842fSSascha Wildner Quotient.Part.Hi, Partial1); 554820c5b08SSascha Wildner 5550d02842fSSascha Wildner ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo, 5560d02842fSSascha Wildner Quotient.Part.Lo, Remainder.Part.Lo); 5570d02842fSSascha Wildner } 5580d02842fSSascha Wildner 5590d02842fSSascha Wildner else 5600d02842fSSascha Wildner { 5610d02842fSSascha Wildner /* 5620d02842fSSascha Wildner * 2) The general case where the divisor is a full 64 bits 5630d02842fSSascha Wildner * is more difficult 5640d02842fSSascha Wildner */ 5650d02842fSSascha Wildner Quotient.Part.Hi = 0; 5660d02842fSSascha Wildner NormalizedDividend = Dividend; 5670d02842fSSascha Wildner NormalizedDivisor = Divisor; 5680d02842fSSascha Wildner 5690d02842fSSascha Wildner /* Normalize the operands (shift until the divisor is < 32 bits) */ 5700d02842fSSascha Wildner 5710d02842fSSascha Wildner do 5720d02842fSSascha Wildner { 573820c5b08SSascha Wildner ACPI_SHIFT_RIGHT_64 ( 574820c5b08SSascha Wildner NormalizedDivisor.Part.Hi, NormalizedDivisor.Part.Lo); 575820c5b08SSascha Wildner ACPI_SHIFT_RIGHT_64 ( 576820c5b08SSascha Wildner NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo); 5770d02842fSSascha Wildner 5780d02842fSSascha Wildner } while (NormalizedDivisor.Part.Hi != 0); 5790d02842fSSascha Wildner 5800d02842fSSascha Wildner /* Partial divide */ 5810d02842fSSascha Wildner 582820c5b08SSascha Wildner ACPI_DIV_64_BY_32 ( 583820c5b08SSascha Wildner NormalizedDividend.Part.Hi, NormalizedDividend.Part.Lo, 584820c5b08SSascha Wildner NormalizedDivisor.Part.Lo, Quotient.Part.Lo, Partial1); 5850d02842fSSascha Wildner 5860d02842fSSascha Wildner /* 587820c5b08SSascha Wildner * The quotient is always 32 bits, and simply requires 588820c5b08SSascha Wildner * adjustment. The 64-bit remainder must be generated. 5890d02842fSSascha Wildner */ 5900d02842fSSascha Wildner Partial1 = Quotient.Part.Lo * Divisor.Part.Hi; 5910d02842fSSascha Wildner Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo; 5920d02842fSSascha Wildner Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1; 5930d02842fSSascha Wildner 5940d02842fSSascha Wildner Remainder.Part.Hi = Partial3.Part.Lo; 5950d02842fSSascha Wildner Remainder.Part.Lo = Partial2.Part.Lo; 5960d02842fSSascha Wildner 5970d02842fSSascha Wildner if (Partial3.Part.Hi == 0) 5980d02842fSSascha Wildner { 5990d02842fSSascha Wildner if (Partial3.Part.Lo >= Dividend.Part.Hi) 6000d02842fSSascha Wildner { 6010d02842fSSascha Wildner if (Partial3.Part.Lo == Dividend.Part.Hi) 6020d02842fSSascha Wildner { 6030d02842fSSascha Wildner if (Partial2.Part.Lo > Dividend.Part.Lo) 6040d02842fSSascha Wildner { 6050d02842fSSascha Wildner Quotient.Part.Lo--; 6060d02842fSSascha Wildner Remainder.Full -= Divisor.Full; 6070d02842fSSascha Wildner } 6080d02842fSSascha Wildner } 6090d02842fSSascha Wildner else 6100d02842fSSascha Wildner { 6110d02842fSSascha Wildner Quotient.Part.Lo--; 6120d02842fSSascha Wildner Remainder.Full -= Divisor.Full; 6130d02842fSSascha Wildner } 6140d02842fSSascha Wildner } 6150d02842fSSascha Wildner 6160d02842fSSascha Wildner Remainder.Full = Remainder.Full - Dividend.Full; 6170d02842fSSascha Wildner Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi); 6180d02842fSSascha Wildner Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo); 6190d02842fSSascha Wildner 6200d02842fSSascha Wildner if (Remainder.Part.Lo) 6210d02842fSSascha Wildner { 6220d02842fSSascha Wildner Remainder.Part.Hi--; 6230d02842fSSascha Wildner } 6240d02842fSSascha Wildner } 6250d02842fSSascha Wildner } 6260d02842fSSascha Wildner 6270d02842fSSascha Wildner /* Return only what was requested */ 6280d02842fSSascha Wildner 6290d02842fSSascha Wildner if (OutQuotient) 6300d02842fSSascha Wildner { 6310d02842fSSascha Wildner *OutQuotient = Quotient.Full; 6320d02842fSSascha Wildner } 6330d02842fSSascha Wildner if (OutRemainder) 6340d02842fSSascha Wildner { 6350d02842fSSascha Wildner *OutRemainder = Remainder.Full; 6360d02842fSSascha Wildner } 6370d02842fSSascha Wildner 6380d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 6390d02842fSSascha Wildner } 6400d02842fSSascha Wildner 6410d02842fSSascha Wildner #else 6420d02842fSSascha Wildner 6430d02842fSSascha Wildner /******************************************************************************* 6440d02842fSSascha Wildner * 6450d02842fSSascha Wildner * FUNCTION: AcpiUtShortDivide, AcpiUtDivide 6460d02842fSSascha Wildner * 6470d02842fSSascha Wildner * PARAMETERS: See function headers above 6480d02842fSSascha Wildner * 6490d02842fSSascha Wildner * DESCRIPTION: Native versions of the UtDivide functions. Use these if either 6500d02842fSSascha Wildner * 1) The target is a 64-bit platform and therefore 64-bit 6510d02842fSSascha Wildner * integer math is supported directly by the machine. 6520d02842fSSascha Wildner * 2) The target is a 32-bit or 16-bit platform, and the 6530d02842fSSascha Wildner * double-precision integer math library is available to 6540d02842fSSascha Wildner * perform the divide. 6550d02842fSSascha Wildner * 6560d02842fSSascha Wildner ******************************************************************************/ 6570d02842fSSascha Wildner 6580d02842fSSascha Wildner ACPI_STATUS 6590d02842fSSascha Wildner AcpiUtShortDivide ( 6600d02842fSSascha Wildner UINT64 InDividend, 6610d02842fSSascha Wildner UINT32 Divisor, 6620d02842fSSascha Wildner UINT64 *OutQuotient, 6630d02842fSSascha Wildner UINT32 *OutRemainder) 6640d02842fSSascha Wildner { 6650d02842fSSascha Wildner 6660d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtShortDivide); 6670d02842fSSascha Wildner 6680d02842fSSascha Wildner 6690d02842fSSascha Wildner /* Always check for a zero divisor */ 6700d02842fSSascha Wildner 6710d02842fSSascha Wildner if (Divisor == 0) 6720d02842fSSascha Wildner { 6730d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 6740d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 6750d02842fSSascha Wildner } 6760d02842fSSascha Wildner 6770d02842fSSascha Wildner /* Return only what was requested */ 6780d02842fSSascha Wildner 6790d02842fSSascha Wildner if (OutQuotient) 6800d02842fSSascha Wildner { 6810d02842fSSascha Wildner *OutQuotient = InDividend / Divisor; 6820d02842fSSascha Wildner } 6830d02842fSSascha Wildner if (OutRemainder) 6840d02842fSSascha Wildner { 6850d02842fSSascha Wildner *OutRemainder = (UINT32) (InDividend % Divisor); 6860d02842fSSascha Wildner } 6870d02842fSSascha Wildner 6880d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 6890d02842fSSascha Wildner } 6900d02842fSSascha Wildner 6910d02842fSSascha Wildner ACPI_STATUS 6920d02842fSSascha Wildner AcpiUtDivide ( 6930d02842fSSascha Wildner UINT64 InDividend, 6940d02842fSSascha Wildner UINT64 InDivisor, 6950d02842fSSascha Wildner UINT64 *OutQuotient, 6960d02842fSSascha Wildner UINT64 *OutRemainder) 6970d02842fSSascha Wildner { 6980d02842fSSascha Wildner ACPI_FUNCTION_TRACE (UtDivide); 6990d02842fSSascha Wildner 7000d02842fSSascha Wildner 7010d02842fSSascha Wildner /* Always check for a zero divisor */ 7020d02842fSSascha Wildner 7030d02842fSSascha Wildner if (InDivisor == 0) 7040d02842fSSascha Wildner { 7050d02842fSSascha Wildner ACPI_ERROR ((AE_INFO, "Divide by zero")); 7060d02842fSSascha Wildner return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 7070d02842fSSascha Wildner } 7080d02842fSSascha Wildner 7090d02842fSSascha Wildner 7100d02842fSSascha Wildner /* Return only what was requested */ 7110d02842fSSascha Wildner 7120d02842fSSascha Wildner if (OutQuotient) 7130d02842fSSascha Wildner { 7140d02842fSSascha Wildner *OutQuotient = InDividend / InDivisor; 7150d02842fSSascha Wildner } 7160d02842fSSascha Wildner if (OutRemainder) 7170d02842fSSascha Wildner { 7180d02842fSSascha Wildner *OutRemainder = InDividend % InDivisor; 7190d02842fSSascha Wildner } 7200d02842fSSascha Wildner 7210d02842fSSascha Wildner return_ACPI_STATUS (AE_OK); 7220d02842fSSascha Wildner } 7230d02842fSSascha Wildner 7240d02842fSSascha Wildner #endif 725