1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef _LIBKERN_QUAD_H_ 37 #define _LIBKERN_QUAD_H_ 38 39 /* 40 * Quad arithmetic. 41 * 42 * This library makes the following assumptions: 43 * 44 * - The type long long (aka quad_t) exists. 45 * 46 * - A quad variable is exactly twice as long as `long'. 47 * 48 * - The machine's arithmetic is two's complement. 49 * 50 * This library can provide 128-bit arithmetic on a machine with 128-bit 51 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines 52 * with 48-bit longs. 53 */ 54 55 #include <sys/types.h> 56 #include <sys/limits.h> 57 #include <sys/syslimits.h> 58 59 /* 60 * Depending on the desired operation, we view a `long long' (aka quad_t) in 61 * one or more of the following formats. 62 */ 63 union uu { 64 quad_t q; /* as a (signed) quad */ 65 quad_t uq; /* as an unsigned quad */ 66 long sl[2]; /* as two signed longs */ 67 u_long ul[2]; /* as two unsigned longs */ 68 }; 69 70 /* 71 * Define high and low longwords. 72 */ 73 #define H _QUAD_HIGHWORD 74 #define L _QUAD_LOWWORD 75 76 /* 77 * Total number of bits in a quad_t and in the pieces that make it up. 78 * These are used for shifting, and also below for halfword extraction 79 * and assembly. 80 */ 81 #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 82 #define LONG_BITS (sizeof(long) * CHAR_BIT) 83 #define HALF_BITS (sizeof(long) * CHAR_BIT / 2) 84 85 /* 86 * Extract high and low shortwords from longword, and move low shortword of 87 * longword to upper half of long, i.e., produce the upper longword of 88 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) 89 * 90 * These are used in the multiply code, to split a longword into upper 91 * and lower halves, and to reassemble a product as a quad_t, shifted left 92 * (sizeof(long)*CHAR_BIT/2). 93 */ 94 #define HHALF(x) ((x) >> HALF_BITS) 95 #define LHALF(x) ((x) & ((1 << HALF_BITS) - 1)) 96 #define LHUP(x) ((x) << HALF_BITS) 97 98 typedef unsigned int qshift_t; 99 100 quad_t __ashldi3(quad_t, qshift_t); 101 quad_t __ashrdi3(quad_t, qshift_t); 102 int __cmpdi2(quad_t a, quad_t b); 103 quad_t __divdi3(quad_t a, quad_t b); 104 quad_t __divmoddi4(quad_t a, quad_t b, quad_t *rem); 105 quad_t __lshrdi3(quad_t, qshift_t); 106 quad_t __moddi3(quad_t a, quad_t b); 107 u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); 108 u_quad_t __udivdi3(u_quad_t a, u_quad_t b); 109 u_quad_t __udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *rem); 110 u_quad_t __umoddi3(u_quad_t a, u_quad_t b); 111 int __ucmpdi2(u_quad_t a, u_quad_t b); 112 113 /* ARM EABI support functions. */ 114 #ifdef __ARM_EABI__ 115 int __aeabi_ulcmp(unsigned long long, unsigned long long); 116 #endif 117 118 #endif /* !_LIBKERN_QUAD_H_ */ 119