utmath.c revision 1.1.1.2.4.2
1 1.1.1.2.4.2 rmind /******************************************************************************* 2 1.1.1.2.4.2 rmind * 3 1.1.1.2.4.2 rmind * Module Name: utmath - Integer math support routines 4 1.1.1.2.4.2 rmind * 5 1.1.1.2.4.2 rmind ******************************************************************************/ 6 1.1.1.2.4.2 rmind 7 1.1.1.2.4.2 rmind /* 8 1.1.1.2.4.2 rmind * Copyright (C) 2000 - 2011, Intel Corp. 9 1.1.1.2.4.2 rmind * All rights reserved. 10 1.1.1.2.4.2 rmind * 11 1.1.1.2.4.2 rmind * Redistribution and use in source and binary forms, with or without 12 1.1.1.2.4.2 rmind * modification, are permitted provided that the following conditions 13 1.1.1.2.4.2 rmind * are met: 14 1.1.1.2.4.2 rmind * 1. Redistributions of source code must retain the above copyright 15 1.1.1.2.4.2 rmind * notice, this list of conditions, and the following disclaimer, 16 1.1.1.2.4.2 rmind * without modification. 17 1.1.1.2.4.2 rmind * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 1.1.1.2.4.2 rmind * substantially similar to the "NO WARRANTY" disclaimer below 19 1.1.1.2.4.2 rmind * ("Disclaimer") and any redistribution must be conditioned upon 20 1.1.1.2.4.2 rmind * including a substantially similar Disclaimer requirement for further 21 1.1.1.2.4.2 rmind * binary redistribution. 22 1.1.1.2.4.2 rmind * 3. Neither the names of the above-listed copyright holders nor the names 23 1.1.1.2.4.2 rmind * of any contributors may be used to endorse or promote products derived 24 1.1.1.2.4.2 rmind * from this software without specific prior written permission. 25 1.1.1.2.4.2 rmind * 26 1.1.1.2.4.2 rmind * Alternatively, this software may be distributed under the terms of the 27 1.1.1.2.4.2 rmind * GNU General Public License ("GPL") version 2 as published by the Free 28 1.1.1.2.4.2 rmind * Software Foundation. 29 1.1.1.2.4.2 rmind * 30 1.1.1.2.4.2 rmind * NO WARRANTY 31 1.1.1.2.4.2 rmind * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 1.1.1.2.4.2 rmind * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 1.1.1.2.4.2 rmind * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 1.1.1.2.4.2 rmind * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 1.1.1.2.4.2 rmind * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 1.1.1.2.4.2 rmind * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 1.1.1.2.4.2 rmind * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 1.1.1.2.4.2 rmind * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 1.1.1.2.4.2 rmind * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 1.1.1.2.4.2 rmind * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 1.1.1.2.4.2 rmind * POSSIBILITY OF SUCH DAMAGES. 42 1.1.1.2.4.2 rmind */ 43 1.1.1.2.4.2 rmind 44 1.1.1.2.4.2 rmind 45 1.1.1.2.4.2 rmind #define __UTMATH_C__ 46 1.1.1.2.4.2 rmind 47 1.1.1.2.4.2 rmind #include "acpi.h" 48 1.1.1.2.4.2 rmind #include "accommon.h" 49 1.1.1.2.4.2 rmind 50 1.1.1.2.4.2 rmind 51 1.1.1.2.4.2 rmind #define _COMPONENT ACPI_UTILITIES 52 1.1.1.2.4.2 rmind ACPI_MODULE_NAME ("utmath") 53 1.1.1.2.4.2 rmind 54 1.1.1.2.4.2 rmind /* 55 1.1.1.2.4.2 rmind * Optional support for 64-bit double-precision integer divide. This code 56 1.1.1.2.4.2 rmind * is configurable and is implemented in order to support 32-bit kernel 57 1.1.1.2.4.2 rmind * environments where a 64-bit double-precision math library is not available. 58 1.1.1.2.4.2 rmind * 59 1.1.1.2.4.2 rmind * Support for a more normal 64-bit divide/modulo (with check for a divide- 60 1.1.1.2.4.2 rmind * by-zero) appears after this optional section of code. 61 1.1.1.2.4.2 rmind */ 62 1.1.1.2.4.2 rmind #ifndef ACPI_USE_NATIVE_DIVIDE 63 1.1.1.2.4.2 rmind 64 1.1.1.2.4.2 rmind /* Structures used only for 64-bit divide */ 65 1.1.1.2.4.2 rmind 66 1.1.1.2.4.2 rmind typedef struct uint64_struct 67 1.1.1.2.4.2 rmind { 68 1.1.1.2.4.2 rmind UINT32 Lo; 69 1.1.1.2.4.2 rmind UINT32 Hi; 70 1.1.1.2.4.2 rmind 71 1.1.1.2.4.2 rmind } UINT64_STRUCT; 72 1.1.1.2.4.2 rmind 73 1.1.1.2.4.2 rmind typedef union uint64_overlay 74 1.1.1.2.4.2 rmind { 75 1.1.1.2.4.2 rmind UINT64 Full; 76 1.1.1.2.4.2 rmind UINT64_STRUCT Part; 77 1.1.1.2.4.2 rmind 78 1.1.1.2.4.2 rmind } UINT64_OVERLAY; 79 1.1.1.2.4.2 rmind 80 1.1.1.2.4.2 rmind 81 1.1.1.2.4.2 rmind /******************************************************************************* 82 1.1.1.2.4.2 rmind * 83 1.1.1.2.4.2 rmind * FUNCTION: AcpiUtShortDivide 84 1.1.1.2.4.2 rmind * 85 1.1.1.2.4.2 rmind * PARAMETERS: Dividend - 64-bit dividend 86 1.1.1.2.4.2 rmind * Divisor - 32-bit divisor 87 1.1.1.2.4.2 rmind * OutQuotient - Pointer to where the quotient is returned 88 1.1.1.2.4.2 rmind * OutRemainder - Pointer to where the remainder is returned 89 1.1.1.2.4.2 rmind * 90 1.1.1.2.4.2 rmind * RETURN: Status (Checks for divide-by-zero) 91 1.1.1.2.4.2 rmind * 92 1.1.1.2.4.2 rmind * DESCRIPTION: Perform a short (maximum 64 bits divided by 32 bits) 93 1.1.1.2.4.2 rmind * divide and modulo. The result is a 64-bit quotient and a 94 1.1.1.2.4.2 rmind * 32-bit remainder. 95 1.1.1.2.4.2 rmind * 96 1.1.1.2.4.2 rmind ******************************************************************************/ 97 1.1.1.2.4.2 rmind 98 1.1.1.2.4.2 rmind ACPI_STATUS 99 1.1.1.2.4.2 rmind AcpiUtShortDivide ( 100 1.1.1.2.4.2 rmind UINT64 Dividend, 101 1.1.1.2.4.2 rmind UINT32 Divisor, 102 1.1.1.2.4.2 rmind UINT64 *OutQuotient, 103 1.1.1.2.4.2 rmind UINT32 *OutRemainder) 104 1.1.1.2.4.2 rmind { 105 1.1.1.2.4.2 rmind UINT64_OVERLAY DividendOvl; 106 1.1.1.2.4.2 rmind UINT64_OVERLAY Quotient; 107 1.1.1.2.4.2 rmind UINT32 Remainder32; 108 1.1.1.2.4.2 rmind 109 1.1.1.2.4.2 rmind 110 1.1.1.2.4.2 rmind ACPI_FUNCTION_TRACE (UtShortDivide); 111 1.1.1.2.4.2 rmind 112 1.1.1.2.4.2 rmind 113 1.1.1.2.4.2 rmind /* Always check for a zero divisor */ 114 1.1.1.2.4.2 rmind 115 1.1.1.2.4.2 rmind if (Divisor == 0) 116 1.1.1.2.4.2 rmind { 117 1.1.1.2.4.2 rmind ACPI_ERROR ((AE_INFO, "Divide by zero")); 118 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 119 1.1.1.2.4.2 rmind } 120 1.1.1.2.4.2 rmind 121 1.1.1.2.4.2 rmind DividendOvl.Full = Dividend; 122 1.1.1.2.4.2 rmind 123 1.1.1.2.4.2 rmind /* 124 1.1.1.2.4.2 rmind * The quotient is 64 bits, the remainder is always 32 bits, 125 1.1.1.2.4.2 rmind * and is generated by the second divide. 126 1.1.1.2.4.2 rmind */ 127 1.1.1.2.4.2 rmind ACPI_DIV_64_BY_32 (0, DividendOvl.Part.Hi, Divisor, 128 1.1.1.2.4.2 rmind Quotient.Part.Hi, Remainder32); 129 1.1.1.2.4.2 rmind ACPI_DIV_64_BY_32 (Remainder32, DividendOvl.Part.Lo, Divisor, 130 1.1.1.2.4.2 rmind Quotient.Part.Lo, Remainder32); 131 1.1.1.2.4.2 rmind 132 1.1.1.2.4.2 rmind /* Return only what was requested */ 133 1.1.1.2.4.2 rmind 134 1.1.1.2.4.2 rmind if (OutQuotient) 135 1.1.1.2.4.2 rmind { 136 1.1.1.2.4.2 rmind *OutQuotient = Quotient.Full; 137 1.1.1.2.4.2 rmind } 138 1.1.1.2.4.2 rmind if (OutRemainder) 139 1.1.1.2.4.2 rmind { 140 1.1.1.2.4.2 rmind *OutRemainder = Remainder32; 141 1.1.1.2.4.2 rmind } 142 1.1.1.2.4.2 rmind 143 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_OK); 144 1.1.1.2.4.2 rmind } 145 1.1.1.2.4.2 rmind 146 1.1.1.2.4.2 rmind 147 1.1.1.2.4.2 rmind /******************************************************************************* 148 1.1.1.2.4.2 rmind * 149 1.1.1.2.4.2 rmind * FUNCTION: AcpiUtDivide 150 1.1.1.2.4.2 rmind * 151 1.1.1.2.4.2 rmind * PARAMETERS: InDividend - Dividend 152 1.1.1.2.4.2 rmind * InDivisor - Divisor 153 1.1.1.2.4.2 rmind * OutQuotient - Pointer to where the quotient is returned 154 1.1.1.2.4.2 rmind * OutRemainder - Pointer to where the remainder is returned 155 1.1.1.2.4.2 rmind * 156 1.1.1.2.4.2 rmind * RETURN: Status (Checks for divide-by-zero) 157 1.1.1.2.4.2 rmind * 158 1.1.1.2.4.2 rmind * DESCRIPTION: Perform a divide and modulo. 159 1.1.1.2.4.2 rmind * 160 1.1.1.2.4.2 rmind ******************************************************************************/ 161 1.1.1.2.4.2 rmind 162 1.1.1.2.4.2 rmind ACPI_STATUS 163 1.1.1.2.4.2 rmind AcpiUtDivide ( 164 1.1.1.2.4.2 rmind UINT64 InDividend, 165 1.1.1.2.4.2 rmind UINT64 InDivisor, 166 1.1.1.2.4.2 rmind UINT64 *OutQuotient, 167 1.1.1.2.4.2 rmind UINT64 *OutRemainder) 168 1.1.1.2.4.2 rmind { 169 1.1.1.2.4.2 rmind UINT64_OVERLAY Dividend; 170 1.1.1.2.4.2 rmind UINT64_OVERLAY Divisor; 171 1.1.1.2.4.2 rmind UINT64_OVERLAY Quotient; 172 1.1.1.2.4.2 rmind UINT64_OVERLAY Remainder; 173 1.1.1.2.4.2 rmind UINT64_OVERLAY NormalizedDividend; 174 1.1.1.2.4.2 rmind UINT64_OVERLAY NormalizedDivisor; 175 1.1.1.2.4.2 rmind UINT32 Partial1; 176 1.1.1.2.4.2 rmind UINT64_OVERLAY Partial2; 177 1.1.1.2.4.2 rmind UINT64_OVERLAY Partial3; 178 1.1.1.2.4.2 rmind 179 1.1.1.2.4.2 rmind 180 1.1.1.2.4.2 rmind ACPI_FUNCTION_TRACE (UtDivide); 181 1.1.1.2.4.2 rmind 182 1.1.1.2.4.2 rmind 183 1.1.1.2.4.2 rmind /* Always check for a zero divisor */ 184 1.1.1.2.4.2 rmind 185 1.1.1.2.4.2 rmind if (InDivisor == 0) 186 1.1.1.2.4.2 rmind { 187 1.1.1.2.4.2 rmind ACPI_ERROR ((AE_INFO, "Divide by zero")); 188 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 189 1.1.1.2.4.2 rmind } 190 1.1.1.2.4.2 rmind 191 1.1.1.2.4.2 rmind Divisor.Full = InDivisor; 192 1.1.1.2.4.2 rmind Dividend.Full = InDividend; 193 1.1.1.2.4.2 rmind if (Divisor.Part.Hi == 0) 194 1.1.1.2.4.2 rmind { 195 1.1.1.2.4.2 rmind /* 196 1.1.1.2.4.2 rmind * 1) Simplest case is where the divisor is 32 bits, we can 197 1.1.1.2.4.2 rmind * just do two divides 198 1.1.1.2.4.2 rmind */ 199 1.1.1.2.4.2 rmind Remainder.Part.Hi = 0; 200 1.1.1.2.4.2 rmind 201 1.1.1.2.4.2 rmind /* 202 1.1.1.2.4.2 rmind * The quotient is 64 bits, the remainder is always 32 bits, 203 1.1.1.2.4.2 rmind * and is generated by the second divide. 204 1.1.1.2.4.2 rmind */ 205 1.1.1.2.4.2 rmind ACPI_DIV_64_BY_32 (0, Dividend.Part.Hi, Divisor.Part.Lo, 206 1.1.1.2.4.2 rmind Quotient.Part.Hi, Partial1); 207 1.1.1.2.4.2 rmind ACPI_DIV_64_BY_32 (Partial1, Dividend.Part.Lo, Divisor.Part.Lo, 208 1.1.1.2.4.2 rmind Quotient.Part.Lo, Remainder.Part.Lo); 209 1.1.1.2.4.2 rmind } 210 1.1.1.2.4.2 rmind 211 1.1.1.2.4.2 rmind else 212 1.1.1.2.4.2 rmind { 213 1.1.1.2.4.2 rmind /* 214 1.1.1.2.4.2 rmind * 2) The general case where the divisor is a full 64 bits 215 1.1.1.2.4.2 rmind * is more difficult 216 1.1.1.2.4.2 rmind */ 217 1.1.1.2.4.2 rmind Quotient.Part.Hi = 0; 218 1.1.1.2.4.2 rmind NormalizedDividend = Dividend; 219 1.1.1.2.4.2 rmind NormalizedDivisor = Divisor; 220 1.1.1.2.4.2 rmind 221 1.1.1.2.4.2 rmind /* Normalize the operands (shift until the divisor is < 32 bits) */ 222 1.1.1.2.4.2 rmind 223 1.1.1.2.4.2 rmind do 224 1.1.1.2.4.2 rmind { 225 1.1.1.2.4.2 rmind ACPI_SHIFT_RIGHT_64 (NormalizedDivisor.Part.Hi, 226 1.1.1.2.4.2 rmind NormalizedDivisor.Part.Lo); 227 1.1.1.2.4.2 rmind ACPI_SHIFT_RIGHT_64 (NormalizedDividend.Part.Hi, 228 1.1.1.2.4.2 rmind NormalizedDividend.Part.Lo); 229 1.1.1.2.4.2 rmind 230 1.1.1.2.4.2 rmind } while (NormalizedDivisor.Part.Hi != 0); 231 1.1.1.2.4.2 rmind 232 1.1.1.2.4.2 rmind /* Partial divide */ 233 1.1.1.2.4.2 rmind 234 1.1.1.2.4.2 rmind ACPI_DIV_64_BY_32 (NormalizedDividend.Part.Hi, 235 1.1.1.2.4.2 rmind NormalizedDividend.Part.Lo, 236 1.1.1.2.4.2 rmind NormalizedDivisor.Part.Lo, 237 1.1.1.2.4.2 rmind Quotient.Part.Lo, Partial1); 238 1.1.1.2.4.2 rmind 239 1.1.1.2.4.2 rmind /* 240 1.1.1.2.4.2 rmind * The quotient is always 32 bits, and simply requires adjustment. 241 1.1.1.2.4.2 rmind * The 64-bit remainder must be generated. 242 1.1.1.2.4.2 rmind */ 243 1.1.1.2.4.2 rmind Partial1 = Quotient.Part.Lo * Divisor.Part.Hi; 244 1.1.1.2.4.2 rmind Partial2.Full = (UINT64) Quotient.Part.Lo * Divisor.Part.Lo; 245 1.1.1.2.4.2 rmind Partial3.Full = (UINT64) Partial2.Part.Hi + Partial1; 246 1.1.1.2.4.2 rmind 247 1.1.1.2.4.2 rmind Remainder.Part.Hi = Partial3.Part.Lo; 248 1.1.1.2.4.2 rmind Remainder.Part.Lo = Partial2.Part.Lo; 249 1.1.1.2.4.2 rmind 250 1.1.1.2.4.2 rmind if (Partial3.Part.Hi == 0) 251 1.1.1.2.4.2 rmind { 252 1.1.1.2.4.2 rmind if (Partial3.Part.Lo >= Dividend.Part.Hi) 253 1.1.1.2.4.2 rmind { 254 1.1.1.2.4.2 rmind if (Partial3.Part.Lo == Dividend.Part.Hi) 255 1.1.1.2.4.2 rmind { 256 1.1.1.2.4.2 rmind if (Partial2.Part.Lo > Dividend.Part.Lo) 257 1.1.1.2.4.2 rmind { 258 1.1.1.2.4.2 rmind Quotient.Part.Lo--; 259 1.1.1.2.4.2 rmind Remainder.Full -= Divisor.Full; 260 1.1.1.2.4.2 rmind } 261 1.1.1.2.4.2 rmind } 262 1.1.1.2.4.2 rmind else 263 1.1.1.2.4.2 rmind { 264 1.1.1.2.4.2 rmind Quotient.Part.Lo--; 265 1.1.1.2.4.2 rmind Remainder.Full -= Divisor.Full; 266 1.1.1.2.4.2 rmind } 267 1.1.1.2.4.2 rmind } 268 1.1.1.2.4.2 rmind 269 1.1.1.2.4.2 rmind Remainder.Full = Remainder.Full - Dividend.Full; 270 1.1.1.2.4.2 rmind Remainder.Part.Hi = (UINT32) -((INT32) Remainder.Part.Hi); 271 1.1.1.2.4.2 rmind Remainder.Part.Lo = (UINT32) -((INT32) Remainder.Part.Lo); 272 1.1.1.2.4.2 rmind 273 1.1.1.2.4.2 rmind if (Remainder.Part.Lo) 274 1.1.1.2.4.2 rmind { 275 1.1.1.2.4.2 rmind Remainder.Part.Hi--; 276 1.1.1.2.4.2 rmind } 277 1.1.1.2.4.2 rmind } 278 1.1.1.2.4.2 rmind } 279 1.1.1.2.4.2 rmind 280 1.1.1.2.4.2 rmind /* Return only what was requested */ 281 1.1.1.2.4.2 rmind 282 1.1.1.2.4.2 rmind if (OutQuotient) 283 1.1.1.2.4.2 rmind { 284 1.1.1.2.4.2 rmind *OutQuotient = Quotient.Full; 285 1.1.1.2.4.2 rmind } 286 1.1.1.2.4.2 rmind if (OutRemainder) 287 1.1.1.2.4.2 rmind { 288 1.1.1.2.4.2 rmind *OutRemainder = Remainder.Full; 289 1.1.1.2.4.2 rmind } 290 1.1.1.2.4.2 rmind 291 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_OK); 292 1.1.1.2.4.2 rmind } 293 1.1.1.2.4.2 rmind 294 1.1.1.2.4.2 rmind #else 295 1.1.1.2.4.2 rmind 296 1.1.1.2.4.2 rmind /******************************************************************************* 297 1.1.1.2.4.2 rmind * 298 1.1.1.2.4.2 rmind * FUNCTION: AcpiUtShortDivide, AcpiUtDivide 299 1.1.1.2.4.2 rmind * 300 1.1.1.2.4.2 rmind * PARAMETERS: See function headers above 301 1.1.1.2.4.2 rmind * 302 1.1.1.2.4.2 rmind * DESCRIPTION: Native versions of the UtDivide functions. Use these if either 303 1.1.1.2.4.2 rmind * 1) The target is a 64-bit platform and therefore 64-bit 304 1.1.1.2.4.2 rmind * integer math is supported directly by the machine. 305 1.1.1.2.4.2 rmind * 2) The target is a 32-bit or 16-bit platform, and the 306 1.1.1.2.4.2 rmind * double-precision integer math library is available to 307 1.1.1.2.4.2 rmind * perform the divide. 308 1.1.1.2.4.2 rmind * 309 1.1.1.2.4.2 rmind ******************************************************************************/ 310 1.1.1.2.4.2 rmind 311 1.1.1.2.4.2 rmind ACPI_STATUS 312 1.1.1.2.4.2 rmind AcpiUtShortDivide ( 313 1.1.1.2.4.2 rmind UINT64 InDividend, 314 1.1.1.2.4.2 rmind UINT32 Divisor, 315 1.1.1.2.4.2 rmind UINT64 *OutQuotient, 316 1.1.1.2.4.2 rmind UINT32 *OutRemainder) 317 1.1.1.2.4.2 rmind { 318 1.1.1.2.4.2 rmind 319 1.1.1.2.4.2 rmind ACPI_FUNCTION_TRACE (UtShortDivide); 320 1.1.1.2.4.2 rmind 321 1.1.1.2.4.2 rmind 322 1.1.1.2.4.2 rmind /* Always check for a zero divisor */ 323 1.1.1.2.4.2 rmind 324 1.1.1.2.4.2 rmind if (Divisor == 0) 325 1.1.1.2.4.2 rmind { 326 1.1.1.2.4.2 rmind ACPI_ERROR ((AE_INFO, "Divide by zero")); 327 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 328 1.1.1.2.4.2 rmind } 329 1.1.1.2.4.2 rmind 330 1.1.1.2.4.2 rmind /* Return only what was requested */ 331 1.1.1.2.4.2 rmind 332 1.1.1.2.4.2 rmind if (OutQuotient) 333 1.1.1.2.4.2 rmind { 334 1.1.1.2.4.2 rmind *OutQuotient = InDividend / Divisor; 335 1.1.1.2.4.2 rmind } 336 1.1.1.2.4.2 rmind if (OutRemainder) 337 1.1.1.2.4.2 rmind { 338 1.1.1.2.4.2 rmind *OutRemainder = (UINT32) (InDividend % Divisor); 339 1.1.1.2.4.2 rmind } 340 1.1.1.2.4.2 rmind 341 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_OK); 342 1.1.1.2.4.2 rmind } 343 1.1.1.2.4.2 rmind 344 1.1.1.2.4.2 rmind ACPI_STATUS 345 1.1.1.2.4.2 rmind AcpiUtDivide ( 346 1.1.1.2.4.2 rmind UINT64 InDividend, 347 1.1.1.2.4.2 rmind UINT64 InDivisor, 348 1.1.1.2.4.2 rmind UINT64 *OutQuotient, 349 1.1.1.2.4.2 rmind UINT64 *OutRemainder) 350 1.1.1.2.4.2 rmind { 351 1.1.1.2.4.2 rmind ACPI_FUNCTION_TRACE (UtDivide); 352 1.1.1.2.4.2 rmind 353 1.1.1.2.4.2 rmind 354 1.1.1.2.4.2 rmind /* Always check for a zero divisor */ 355 1.1.1.2.4.2 rmind 356 1.1.1.2.4.2 rmind if (InDivisor == 0) 357 1.1.1.2.4.2 rmind { 358 1.1.1.2.4.2 rmind ACPI_ERROR ((AE_INFO, "Divide by zero")); 359 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_AML_DIVIDE_BY_ZERO); 360 1.1.1.2.4.2 rmind } 361 1.1.1.2.4.2 rmind 362 1.1.1.2.4.2 rmind 363 1.1.1.2.4.2 rmind /* Return only what was requested */ 364 1.1.1.2.4.2 rmind 365 1.1.1.2.4.2 rmind if (OutQuotient) 366 1.1.1.2.4.2 rmind { 367 1.1.1.2.4.2 rmind *OutQuotient = InDividend / InDivisor; 368 1.1.1.2.4.2 rmind } 369 1.1.1.2.4.2 rmind if (OutRemainder) 370 1.1.1.2.4.2 rmind { 371 1.1.1.2.4.2 rmind *OutRemainder = InDividend % InDivisor; 372 1.1.1.2.4.2 rmind } 373 1.1.1.2.4.2 rmind 374 1.1.1.2.4.2 rmind return_ACPI_STATUS (AE_OK); 375 1.1.1.2.4.2 rmind } 376 1.1.1.2.4.2 rmind 377 1.1.1.2.4.2 rmind #endif 378 1.1.1.2.4.2 rmind 379 1.1.1.2.4.2 rmind 380
Indexes created Thu Oct 02 14:10:14 GMT 2025