nataraid(4): Add devstat support.
[dragonfly.git] / sys / libkern / quad.h
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1/*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)quad.h 8.1 (Berkeley) 6/4/93
38 * $FreeBSD: src/sys/libkern/quad.h,v 1.9 1999/08/28 00:46:36 peter Exp $
c5bf2c80 39 * $DragonFly: src/sys/libkern/quad.h,v 1.5 2003/11/09 05:15:32 dillon Exp $
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40 */
41
42/*
43 * Quad arithmetic.
44 *
45 * This library makes the following assumptions:
46 *
47 * - The type long long (aka quad_t) exists.
48 *
49 * - A quad variable is exactly twice as long as `long'.
50 *
51 * - The machine's arithmetic is two's complement.
52 *
53 * This library can provide 128-bit arithmetic on a machine with 128-bit
54 * quads and 64-bit longs, for instance, or 96-bit arithmetic on machines
55 * with 48-bit longs.
56 */
57
58#include <sys/cdefs.h>
59#include <sys/types.h>
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60#include <machine/endian.h>
61#include <machine/limits.h>
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62
63/*
64 * Depending on the desired operation, we view a `long long' (aka quad_t) in
65 * one or more of the following formats.
66 */
67union uu {
68 quad_t q; /* as a (signed) quad */
69 quad_t uq; /* as an unsigned quad */
70 long sl[2]; /* as two signed longs */
71 u_long ul[2]; /* as two unsigned longs */
72};
73
74/*
75 * Define high and low longwords.
76 */
77#define H _QUAD_HIGHWORD
78#define L _QUAD_LOWWORD
79
80/*
81 * Total number of bits in a quad_t and in the pieces that make it up.
82 * These are used for shifting, and also below for halfword extraction
83 * and assembly.
84 */
85#define QUAD_BITS (sizeof(quad_t) * CHAR_BIT)
86#define LONG_BITS (sizeof(long) * CHAR_BIT)
87#define HALF_BITS (sizeof(long) * CHAR_BIT / 2)
88
89/*
90 * Extract high and low shortwords from longword, and move low shortword of
91 * longword to upper half of long, i.e., produce the upper longword of
92 * ((quad_t)(x) << (number_of_bits_in_long/2)). (`x' must actually be u_long.)
93 *
94 * These are used in the multiply code, to split a longword into upper
95 * and lower halves, and to reassemble a product as a quad_t, shifted left
96 * (sizeof(long)*CHAR_BIT/2).
97 */
98#define HHALF(x) ((x) >> HALF_BITS)
99#define LHALF(x) ((x) & ((1 << HALF_BITS) - 1))
100#define LHUP(x) ((x) << HALF_BITS)
101
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102quad_t __divdi3 (quad_t a, quad_t b);
103quad_t __moddi3 (quad_t a, quad_t b);
104u_quad_t __qdivrem (u_quad_t u, u_quad_t v, u_quad_t *rem);
105u_quad_t __udivdi3 (u_quad_t a, u_quad_t b);
106u_quad_t __umoddi3 (u_quad_t a, u_quad_t b);
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107int __ucmpdi2(u_quad_t a, u_quad_t b);
108int __cmpdi2(quad_t a, quad_t b);
109
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110
111/*
112 * XXX
113 * Compensate for gcc 1 vs gcc 2. Gcc 1 defines ?sh?di3's second argument
114 * as u_quad_t, while gcc 2 correctly uses int. Unfortunately, we still use
115 * both compilers.
116 */
117#if __GNUC__ >= 2
118typedef unsigned int qshift_t;
119#else
120typedef u_quad_t qshift_t;
121#endif