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
42 typedef 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
49 typedef 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
78 static inline int
countLeadingZeros32(u_int32_t a)79 countLeadingZeros32(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