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 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