| /*- |
| * Copyright (c) 1992, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This software was developed by the Computer Systems Engineering group |
| * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and |
| * contributed to Berkeley. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * @(#)quad.h 8.1 (Berkeley) 6/4/93 |
| * $FreeBSD: src/sys/libkern/quad.h,v 1.19.2.1.2.1 2009/10/25 01:10:29 kensmith Exp $ |
| */ |
| |
| #ifndef _BSD_LIBKERN_QUAD_H_ |
| #define _BSD_LIBKERN_QUAD_H_ |
| |
| /* |
| * Quad arithmetic. |
| * |
| * This library makes the following assumptions: |
| * |
| * - The type long long (aka quad_t) exists. |
| * |
| * - A quad variable is exactly twice as long as `long'. |
| * |
| * - The machine's arithmetic is two's complement. |
| * |
| * This library can provide 128-bit arithmetic on a machine with 128-bit |
| * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines |
| * with 48-bit longs. |
| */ |
| |
| #include <sys/bsd_cdefs.h> |
| #include <sys/bsd_types.h> |
| #include <sys/bsd_limits.h> |
| #include <sys/bsd_syslimits.h> |
| |
| /* |
| * Depending on the desired operation, we view a `long long' (aka quad_t) in |
| * one or more of the following formats. |
| */ |
| union uu { |
| quad_t q; /* as a (signed) quad */ |
| quad_t uq; /* as an unsigned quad */ |
| long sl[2]; /* as two signed longs */ |
| u_long ul[2]; /* as two unsigned longs */ |
| }; |
| |
| /* |
| * Define high and low longwords. |
| */ |
| #define H _QUAD_HIGHWORD |
| #define L _QUAD_LOWWORD |
| |
| /* |
| * Total number of bits in a quad_t and in the pieces that make it up. |
| * These are used for shifting, and also below for halfword extraction |
| * and assembly. |
| */ |
| #define QUAD_BITS (sizeof(quad_t) * CHAR_BIT) |
| #define LONG_BITS (sizeof(long) * CHAR_BIT) |
| #define HALF_BITS (sizeof(long) * CHAR_BIT / 2) |
| |
| /* |
| * Extract high and low shortwords from longword, and move low shortword of |
| * longword to upper half of long, i.e., produce the upper longword of |
| * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.) |
| * |
| * These are used in the multiply code, to split a longword into upper |
| * and lower halves, and to reassemble a product as a quad_t, shifted left |
| * (sizeof(long)*CHAR_BIT/2). |
| */ |
| #define HHALF(x) ((x) >> HALF_BITS) |
| #define LHALF(x) ((x) & ((1UL << HALF_BITS) - 1)) |
| #define LHUP(x) ((x) << HALF_BITS) |
| |
| typedef unsigned int qshift_t; |
| |
| quad_t __ashldi3(quad_t, qshift_t); |
| quad_t __ashrdi3(quad_t, qshift_t); |
| int __cmpdi2(quad_t a, quad_t b); |
| quad_t __divdi3(quad_t a, quad_t b); |
| quad_t __lshrdi3(quad_t, qshift_t); |
| quad_t __moddi3(quad_t a, quad_t b); |
| u_quad_t __qdivrem(u_quad_t u, u_quad_t v, u_quad_t *rem); |
| u_quad_t __udivdi3(u_quad_t a, u_quad_t b); |
| u_quad_t __umoddi3(u_quad_t a, u_quad_t b); |
| int __ucmpdi2(u_quad_t a, u_quad_t b); |
| |
| #endif /* !_BSD_LIBKERN_QUAD_H_ */ |
