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 *
11*383048acSSascha Wildner * Some or all of this work - Copyright (c) 1999 - 2021, 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
1753c639e0cSSascha Wildner /*
1763c639e0cSSascha Wildner * Optional support for 64-bit double-precision integer multiply and shift.
1773c639e0cSSascha Wildner * This code is configurable and is implemented in order to support 32-bit
1783c639e0cSSascha Wildner * kernel environments where a 64-bit double-precision math library is not
1793c639e0cSSascha Wildner * available.
1803c639e0cSSascha Wildner */
1813c639e0cSSascha Wildner #ifndef ACPI_USE_NATIVE_MATH64
1823c639e0cSSascha Wildner
1833c639e0cSSascha Wildner /*******************************************************************************
1843c639e0cSSascha Wildner *
1853c639e0cSSascha Wildner * FUNCTION: AcpiUtShortMultiply
1863c639e0cSSascha Wildner *
1873c639e0cSSascha Wildner * PARAMETERS: Multiplicand - 64-bit multiplicand
1883c639e0cSSascha Wildner * Multiplier - 32-bit multiplier
1893c639e0cSSascha Wildner * OutProduct - Pointer to where the product is returned
1903c639e0cSSascha Wildner *
1913c639e0cSSascha Wildner * DESCRIPTION: Perform a short multiply.
1923c639e0cSSascha Wildner *
1933c639e0cSSascha Wildner ******************************************************************************/
1943c639e0cSSascha Wildner
1953c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortMultiply(UINT64 Multiplicand,UINT32 Multiplier,UINT64 * OutProduct)1963c639e0cSSascha Wildner AcpiUtShortMultiply (
1973c639e0cSSascha Wildner UINT64 Multiplicand,
1983c639e0cSSascha Wildner UINT32 Multiplier,
1993c639e0cSSascha Wildner UINT64 *OutProduct)
2003c639e0cSSascha Wildner {
2013c639e0cSSascha Wildner UINT64_OVERLAY MultiplicandOvl;
2023c639e0cSSascha Wildner UINT64_OVERLAY Product;
2033c639e0cSSascha Wildner UINT32 Carry32;
2043c639e0cSSascha Wildner
2053c639e0cSSascha Wildner
2063c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortMultiply);
2073c639e0cSSascha Wildner
2083c639e0cSSascha Wildner
2093c639e0cSSascha Wildner MultiplicandOvl.Full = Multiplicand;
2103c639e0cSSascha Wildner
2113c639e0cSSascha Wildner /*
2123c639e0cSSascha Wildner * The Product is 64 bits, the carry is always 32 bits,
2133c639e0cSSascha Wildner * and is generated by the second multiply.
2143c639e0cSSascha Wildner */
2153c639e0cSSascha Wildner ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Hi, Multiplier,
2163c639e0cSSascha Wildner Product.Part.Hi, Carry32);
2173c639e0cSSascha Wildner
2183c639e0cSSascha Wildner ACPI_MUL_64_BY_32 (0, MultiplicandOvl.Part.Lo, Multiplier,
2193c639e0cSSascha Wildner Product.Part.Lo, Carry32);
2203c639e0cSSascha Wildner
2213c639e0cSSascha Wildner Product.Part.Hi += Carry32;
2223c639e0cSSascha Wildner
2233c639e0cSSascha Wildner /* Return only what was requested */
2243c639e0cSSascha Wildner
2253c639e0cSSascha Wildner if (OutProduct)
2263c639e0cSSascha Wildner {
2273c639e0cSSascha Wildner *OutProduct = Product.Full;
2283c639e0cSSascha Wildner }
2293c639e0cSSascha Wildner
2303c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
2313c639e0cSSascha Wildner }
2323c639e0cSSascha Wildner
2333c639e0cSSascha Wildner
2343c639e0cSSascha Wildner /*******************************************************************************
2353c639e0cSSascha Wildner *
2363c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftLeft
2373c639e0cSSascha Wildner *
2383c639e0cSSascha Wildner * PARAMETERS: Operand - 64-bit shift operand
2393c639e0cSSascha Wildner * Count - 32-bit shift count
2403c639e0cSSascha Wildner * OutResult - Pointer to where the result is returned
2413c639e0cSSascha Wildner *
2423c639e0cSSascha Wildner * DESCRIPTION: Perform a short left shift.
2433c639e0cSSascha Wildner *
2443c639e0cSSascha Wildner ******************************************************************************/
2453c639e0cSSascha Wildner
2463c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortShiftLeft(UINT64 Operand,UINT32 Count,UINT64 * OutResult)2473c639e0cSSascha Wildner AcpiUtShortShiftLeft (
2483c639e0cSSascha Wildner UINT64 Operand,
2493c639e0cSSascha Wildner UINT32 Count,
2503c639e0cSSascha Wildner UINT64 *OutResult)
2513c639e0cSSascha Wildner {
2523c639e0cSSascha Wildner UINT64_OVERLAY OperandOvl;
2533c639e0cSSascha Wildner
2543c639e0cSSascha Wildner
2553c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftLeft);
2563c639e0cSSascha Wildner
2573c639e0cSSascha Wildner
2583c639e0cSSascha Wildner OperandOvl.Full = Operand;
2593c639e0cSSascha Wildner
2603c639e0cSSascha Wildner if ((Count & 63) >= 32)
2613c639e0cSSascha Wildner {
2623c639e0cSSascha Wildner OperandOvl.Part.Hi = OperandOvl.Part.Lo;
2637bcb6cafSSascha Wildner OperandOvl.Part.Lo = 0;
2643c639e0cSSascha Wildner Count = (Count & 63) - 32;
2653c639e0cSSascha Wildner }
2663c639e0cSSascha Wildner ACPI_SHIFT_LEFT_64_BY_32 (OperandOvl.Part.Hi,
2673c639e0cSSascha Wildner OperandOvl.Part.Lo, Count);
2683c639e0cSSascha Wildner
2693c639e0cSSascha Wildner /* Return only what was requested */
2703c639e0cSSascha Wildner
2713c639e0cSSascha Wildner if (OutResult)
2723c639e0cSSascha Wildner {
2733c639e0cSSascha Wildner *OutResult = OperandOvl.Full;
2743c639e0cSSascha Wildner }
2753c639e0cSSascha Wildner
2763c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
2773c639e0cSSascha Wildner }
2783c639e0cSSascha Wildner
2793c639e0cSSascha Wildner /*******************************************************************************
2803c639e0cSSascha Wildner *
2813c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftRight
2823c639e0cSSascha Wildner *
2833c639e0cSSascha Wildner * PARAMETERS: Operand - 64-bit shift operand
2843c639e0cSSascha Wildner * Count - 32-bit shift count
2853c639e0cSSascha Wildner * OutResult - Pointer to where the result is returned
2863c639e0cSSascha Wildner *
2873c639e0cSSascha Wildner * DESCRIPTION: Perform a short right shift.
2883c639e0cSSascha Wildner *
2893c639e0cSSascha Wildner ******************************************************************************/
2903c639e0cSSascha Wildner
2913c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortShiftRight(UINT64 Operand,UINT32 Count,UINT64 * OutResult)2923c639e0cSSascha Wildner AcpiUtShortShiftRight (
2933c639e0cSSascha Wildner UINT64 Operand,
2943c639e0cSSascha Wildner UINT32 Count,
2953c639e0cSSascha Wildner UINT64 *OutResult)
2963c639e0cSSascha Wildner {
2973c639e0cSSascha Wildner UINT64_OVERLAY OperandOvl;
2983c639e0cSSascha Wildner
2993c639e0cSSascha Wildner
3003c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftRight);
3013c639e0cSSascha Wildner
3023c639e0cSSascha Wildner
3033c639e0cSSascha Wildner OperandOvl.Full = Operand;
3043c639e0cSSascha Wildner
3053c639e0cSSascha Wildner if ((Count & 63) >= 32)
3063c639e0cSSascha Wildner {
3073c639e0cSSascha Wildner OperandOvl.Part.Lo = OperandOvl.Part.Hi;
3087bcb6cafSSascha Wildner OperandOvl.Part.Hi = 0;
3093c639e0cSSascha Wildner Count = (Count & 63) - 32;
3103c639e0cSSascha Wildner }
3113c639e0cSSascha Wildner ACPI_SHIFT_RIGHT_64_BY_32 (OperandOvl.Part.Hi,
3123c639e0cSSascha Wildner OperandOvl.Part.Lo, Count);
3133c639e0cSSascha Wildner
3143c639e0cSSascha Wildner /* Return only what was requested */
3153c639e0cSSascha Wildner
3163c639e0cSSascha Wildner if (OutResult)
3173c639e0cSSascha Wildner {
3183c639e0cSSascha Wildner *OutResult = OperandOvl.Full;
3193c639e0cSSascha Wildner }
3203c639e0cSSascha Wildner
3213c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
3223c639e0cSSascha Wildner }
3233c639e0cSSascha Wildner #else
3243c639e0cSSascha Wildner
3253c639e0cSSascha Wildner /*******************************************************************************
3263c639e0cSSascha Wildner *
3273c639e0cSSascha Wildner * FUNCTION: AcpiUtShortMultiply
3283c639e0cSSascha Wildner *
3293c639e0cSSascha Wildner * PARAMETERS: See function headers above
3303c639e0cSSascha Wildner *
3313c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortMultiply function.
3323c639e0cSSascha Wildner *
3333c639e0cSSascha Wildner ******************************************************************************/
3343c639e0cSSascha Wildner
3353c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortMultiply(UINT64 Multiplicand,UINT32 Multiplier,UINT64 * OutProduct)3363c639e0cSSascha Wildner AcpiUtShortMultiply (
3373c639e0cSSascha Wildner UINT64 Multiplicand,
3383c639e0cSSascha Wildner UINT32 Multiplier,
3393c639e0cSSascha Wildner UINT64 *OutProduct)
3403c639e0cSSascha Wildner {
3413c639e0cSSascha Wildner
3423c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortMultiply);
3433c639e0cSSascha Wildner
3443c639e0cSSascha Wildner
3453c639e0cSSascha Wildner /* Return only what was requested */
3463c639e0cSSascha Wildner
3473c639e0cSSascha Wildner if (OutProduct)
3483c639e0cSSascha Wildner {
3493c639e0cSSascha Wildner *OutProduct = Multiplicand * Multiplier;
3503c639e0cSSascha Wildner }
3513c639e0cSSascha Wildner
3523c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
3533c639e0cSSascha Wildner }
3543c639e0cSSascha Wildner
3553c639e0cSSascha Wildner /*******************************************************************************
3563c639e0cSSascha Wildner *
3573c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftLeft
3583c639e0cSSascha Wildner *
3593c639e0cSSascha Wildner * PARAMETERS: See function headers above
3603c639e0cSSascha Wildner *
3613c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortShiftLeft function.
3623c639e0cSSascha Wildner *
3633c639e0cSSascha Wildner ******************************************************************************/
3643c639e0cSSascha Wildner
3653c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortShiftLeft(UINT64 Operand,UINT32 Count,UINT64 * OutResult)3663c639e0cSSascha Wildner AcpiUtShortShiftLeft (
3673c639e0cSSascha Wildner UINT64 Operand,
3683c639e0cSSascha Wildner UINT32 Count,
3693c639e0cSSascha Wildner UINT64 *OutResult)
3703c639e0cSSascha Wildner {
3713c639e0cSSascha Wildner
3723c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftLeft);
3733c639e0cSSascha Wildner
3743c639e0cSSascha Wildner
3753c639e0cSSascha Wildner /* Return only what was requested */
3763c639e0cSSascha Wildner
3773c639e0cSSascha Wildner if (OutResult)
3783c639e0cSSascha Wildner {
3793c639e0cSSascha Wildner *OutResult = Operand << Count;
3803c639e0cSSascha Wildner }
3813c639e0cSSascha Wildner
3823c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
3833c639e0cSSascha Wildner }
3843c639e0cSSascha Wildner
3853c639e0cSSascha Wildner /*******************************************************************************
3863c639e0cSSascha Wildner *
3873c639e0cSSascha Wildner * FUNCTION: AcpiUtShortShiftRight
3883c639e0cSSascha Wildner *
3893c639e0cSSascha Wildner * PARAMETERS: See function headers above
3903c639e0cSSascha Wildner *
3913c639e0cSSascha Wildner * DESCRIPTION: Native version of the UtShortShiftRight function.
3923c639e0cSSascha Wildner *
3933c639e0cSSascha Wildner ******************************************************************************/
3943c639e0cSSascha Wildner
3953c639e0cSSascha Wildner ACPI_STATUS
AcpiUtShortShiftRight(UINT64 Operand,UINT32 Count,UINT64 * OutResult)3963c639e0cSSascha Wildner AcpiUtShortShiftRight (
3973c639e0cSSascha Wildner UINT64 Operand,
3983c639e0cSSascha Wildner UINT32 Count,
3993c639e0cSSascha Wildner UINT64 *OutResult)
4003c639e0cSSascha Wildner {
4013c639e0cSSascha Wildner
4023c639e0cSSascha Wildner ACPI_FUNCTION_TRACE (UtShortShiftRight);
4033c639e0cSSascha Wildner
4043c639e0cSSascha Wildner
4053c639e0cSSascha Wildner /* Return only what was requested */
4063c639e0cSSascha Wildner
4073c639e0cSSascha Wildner if (OutResult)
4083c639e0cSSascha Wildner {
4093c639e0cSSascha Wildner *OutResult = Operand >> Count;
4103c639e0cSSascha Wildner }
4113c639e0cSSascha Wildner
4123c639e0cSSascha Wildner return_ACPI_STATUS (AE_OK);
4133c639e0cSSascha Wildner }
4143c639e0cSSascha Wildner #endif
4153c639e0cSSascha Wildner
4163c639e0cSSascha Wildner /*
4173c639e0cSSascha Wildner * Optional support for 64-bit double-precision integer divide. This code
4183c639e0cSSascha Wildner * is configurable and is implemented in order to support 32-bit kernel
4193c639e0cSSascha Wildner * environments where a 64-bit double-precision math library is not available.
4203c639e0cSSascha Wildner *
4213c639e0cSSascha Wildner * Support for a more normal 64-bit divide/modulo (with check for a divide-
4223c639e0cSSascha Wildner * by-zero) appears after this optional section of code.
4233c639e0cSSascha Wildner */
4243c639e0cSSascha Wildner #ifndef ACPI_USE_NATIVE_DIVIDE
4253c639e0cSSascha 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
AcpiUtShortDivide(UINT64 Dividend,UINT32 Divisor,UINT64 * OutQuotient,UINT32 * OutRemainder)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
AcpiUtDivide(UINT64 InDividend,UINT64 InDivisor,UINT64 * OutQuotient,UINT64 * OutRemainder)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
AcpiUtShortDivide(UINT64 InDividend,UINT32 Divisor,UINT64 * OutQuotient,UINT32 * OutRemainder)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
AcpiUtDivide(UINT64 InDividend,UINT64 InDivisor,UINT64 * OutQuotient,UINT64 * OutRemainder)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