1/*	$OpenBSD: ieeefp.h,v 1.5 2014/06/09 16:26:32 miod Exp $ */
2/*
3 * Copyright (c) 1996 Nivas Madhur
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Nivas Madhur.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 */
32/*
33 * Values for fp_except are selected to match the bits in FPSR (see
34 * m88100 user's manual page 6-33). This file is derived from the
35 * definitions in the ABI/88k manual and sparc port.
36 * 			       -- Nivas
37 */
38
39#ifndef _M88K_IEEEFP_H_
40#define _M88K_IEEEFP_H_
41
42typedef int fp_except;
43#define FP_X_INV	0x10	/* invalid operation exception */
44#define FP_X_DZ		0x08	/* divide-by-zero exception */
45#define FP_X_UFL	0x04	/* underflow exception */
46#define FP_X_OFL	0x02	/* overflow exception */
47#define FP_X_IMP	0x01	/* imprecise (loss of precision) */
48
49typedef enum {
50    FP_RN=0,		/* round to nearest representable number */
51    FP_RZ=1,		/* round to zero (truncate) */
52    FP_RM=2,		/* round toward negative infinity */
53    FP_RP=3		/* round toward positive infinity */
54} fp_rnd;
55
56#ifdef _KERNEL
57
58/*
59 * Defines for the floating-point completion code.
60 */
61
62#include <sys/param.h>
63#include <sys/systm.h>
64#include <sys/proc.h>
65
66#define	float_raise(bits)	curproc->p_md.md_tf->tf_fpsr |= bits
67#define	float_set_inexact()	float_raise(FP_X_IMP)
68#define	float_set_invalid()	float_raise(FP_X_INV)
69
70/* rounding mode bits position in FPCR */
71#define	FPCR_RD_SHIFT	14
72#define	FPCR_RD_MASK	0x03
73
74#define	float_get_round(fpcr)	(((fpcr) >> FPCR_RD_SHIFT) & FPCR_RD_MASK)
75#define	fpgetround()		float_get_round(curproc->p_md.md_tf->tf_fpcr)
76
77#define	SOFTFLOAT_MD_CLZ
78static inline int
79countLeadingZeros32(u_int32_t a)
80{
81	int rc;
82	asm volatile("ff1 %0, %1" : "=r"(rc) : "r"(a));
83	return (a != 0 ? 31 - rc : rc);
84}
85
86#endif /* _KERNEL */
87
88#endif /* _M88K_IEEEFP_H_ */
89