11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1992, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This software was developed by the Computer Systems Engineering group 61541Srgrimes * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 71541Srgrimes * contributed to Berkeley. 81541Srgrimes * 91541Srgrimes * Redistribution and use in source and binary forms, with or without 101541Srgrimes * modification, are permitted provided that the following conditions 111541Srgrimes * are met: 121541Srgrimes * 1. Redistributions of source code must retain the above copyright 131541Srgrimes * notice, this list of conditions and the following disclaimer. 141541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151541Srgrimes * notice, this list of conditions and the following disclaimer in the 161541Srgrimes * documentation and/or other materials provided with the distribution. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)quad.h 8.1 (Berkeley) 6/4/93 3450477Speter * $FreeBSD: releng/10.3/sys/libkern/quad.h 245840 2013-01-23 09:18:18Z andrew $ 351541Srgrimes */ 361541Srgrimes 37128965Sbde#ifndef _LIBKERN_QUAD_H_ 38128965Sbde#define _LIBKERN_QUAD_H_ 39104667Sphk 401541Srgrimes/* 411541Srgrimes * Quad arithmetic. 421541Srgrimes * 431541Srgrimes * This library makes the following assumptions: 441541Srgrimes * 451541Srgrimes * - The type long long (aka quad_t) exists. 461541Srgrimes * 471541Srgrimes * - A quad variable is exactly twice as long as `long'. 481541Srgrimes * 491541Srgrimes * - The machine's arithmetic is two's complement. 501541Srgrimes * 511541Srgrimes * This library can provide 128-bit arithmetic on a machine with 128-bit 521541Srgrimes * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines 531541Srgrimes * with 48-bit longs. 541541Srgrimes */ 551541Srgrimes 5615311Sbde#include <sys/cdefs.h> 571541Srgrimes#include <sys/types.h> 58114216Skan#include <sys/limits.h> 5979418Sjulian#include <sys/syslimits.h> 601541Srgrimes 611541Srgrimes/* 621541Srgrimes * Depending on the desired operation, we view a `long long' (aka quad_t) in 631541Srgrimes * one or more of the following formats. 641541Srgrimes */ 651541Srgrimesunion uu { 661541Srgrimes quad_t q; /* as a (signed) quad */ 671541Srgrimes quad_t uq; /* as an unsigned quad */ 681541Srgrimes long sl[2]; /* as two signed longs */ 691541Srgrimes u_long ul[2]; /* as two unsigned longs */ 701541Srgrimes}; 711541Srgrimes 721541Srgrimes/* 731541Srgrimes * Define high and low longwords. 741541Srgrimes */ 751541Srgrimes#define H _QUAD_HIGHWORD 761541Srgrimes#define L _QUAD_LOWWORD 771541Srgrimes 781541Srgrimes/* 791541Srgrimes * Total number of bits in a quad_t and in the pieces that make it up. 801541Srgrimes * These are used for shifting, and also below for halfword extraction 811541Srgrimes * and assembly. 821541Srgrimes */ 831541Srgrimes#define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) 841541Srgrimes#define LONG_BITS (sizeof(long) * CHAR_BIT) 851541Srgrimes#define HALF_BITS (sizeof(long) * CHAR_BIT / 2) 861541Srgrimes 871541Srgrimes/* 881541Srgrimes * Extract high and low shortwords from longword, and move low shortword of 891541Srgrimes * longword to upper half of long, i.e., produce the upper longword of 901541Srgrimes * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) 911541Srgrimes * 921541Srgrimes * These are used in the multiply code, to split a longword into upper 931541Srgrimes * and lower halves, and to reassemble a product as a quad_t, shifted left 941541Srgrimes * (sizeof(long)*CHAR_BIT/2). 951541Srgrimes */ 961541Srgrimes#define HHALF(x) ((x) >> HALF_BITS) 971541Srgrimes#define LHALF(x) ((x) & ((1 << HALF_BITS) - 1)) 981541Srgrimes#define LHUP(x) ((x) << HALF_BITS) 991541Srgrimes 100128965Sbdetypedef unsigned int qshift_t; 101128965Sbde 102128965Sbdequad_t __ashldi3(quad_t, qshift_t); 103128965Sbdequad_t __ashrdi3(quad_t, qshift_t); 104176496Smarcelint __cmpdi2(quad_t a, quad_t b); 10592741Salfredquad_t __divdi3(quad_t a, quad_t b); 106128965Sbdequad_t __lshrdi3(quad_t, qshift_t); 10792741Salfredquad_t __moddi3(quad_t a, quad_t b); 10892741Salfredu_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); 10992741Salfredu_quad_t __udivdi3(u_quad_t a, u_quad_t b); 11092741Salfredu_quad_t __umoddi3(u_quad_t a, u_quad_t b); 11192741Salfredint __ucmpdi2(u_quad_t a, u_quad_t b); 1121541Srgrimes 113245840Sandrew/* ARM EABI support functions. */ 114245840Sandrew#ifdef __ARM_EABI__ 115245840Sandrewint __aeabi_ulcmp(unsigned long long, unsigned long long); 116245840Sandrew#endif 117245840Sandrew 118128965Sbde#endif /* !_LIBKERN_QUAD_H_ */ 119