1 /* 2 * MIPS floating point support 3 * Copyright (C) 1994-2000 Algorithmics Ltd. 4 * 5 * This program is free software; you can distribute it and/or modify it 6 * under the terms of the GNU General Public License (Version 2) as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * for more details. 13 * 14 * You should have received a copy of the GNU General Public License along 15 * with this program; if not, write to the Free Software Foundation, Inc., 16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 * 18 * Nov 7, 2000 19 * Modification to allow integration with Linux kernel 20 * 21 * Kevin D. Kissell, kevink@mips.com and Carsten Langgard, carstenl@mips.com 22 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved. 23 */ 24 #ifndef __ARCH_MIPS_MATH_EMU_IEEE754_H 25 #define __ARCH_MIPS_MATH_EMU_IEEE754_H 26 27 #include <linux/compiler.h> 28 #include <asm/byteorder.h> 29 #include <linux/kernel.h> 30 #include <linux/types.h> 31 #include <linux/sched.h> 32 #include <asm/bitfield.h> 33 34 union ieee754dp { 35 struct { 36 __BITFIELD_FIELD(unsigned int sign:1, 37 __BITFIELD_FIELD(unsigned int bexp:11, 38 __BITFIELD_FIELD(u64 mant:52, 39 ;))) 40 }; 41 u64 bits; 42 }; 43 44 union ieee754sp { 45 struct { 46 __BITFIELD_FIELD(unsigned sign:1, 47 __BITFIELD_FIELD(unsigned bexp:8, 48 __BITFIELD_FIELD(unsigned mant:23, 49 ;))) 50 }; 51 u32 bits; 52 }; 53 54 /* 55 * single precision (often aka float) 56 */ 57 int ieee754sp_class(union ieee754sp x); 58 59 union ieee754sp ieee754sp_abs(union ieee754sp x); 60 union ieee754sp ieee754sp_neg(union ieee754sp x); 61 62 union ieee754sp ieee754sp_add(union ieee754sp x, union ieee754sp y); 63 union ieee754sp ieee754sp_sub(union ieee754sp x, union ieee754sp y); 64 union ieee754sp ieee754sp_mul(union ieee754sp x, union ieee754sp y); 65 union ieee754sp ieee754sp_div(union ieee754sp x, union ieee754sp y); 66 67 union ieee754sp ieee754sp_fint(int x); 68 union ieee754sp ieee754sp_flong(s64 x); 69 union ieee754sp ieee754sp_fdp(union ieee754dp x); 70 71 int ieee754sp_tint(union ieee754sp x); 72 s64 ieee754sp_tlong(union ieee754sp x); 73 74 int ieee754sp_cmp(union ieee754sp x, union ieee754sp y, int cop, int sig); 75 76 union ieee754sp ieee754sp_sqrt(union ieee754sp x); 77 78 /* 79 * double precision (often aka double) 80 */ 81 int ieee754dp_class(union ieee754dp x); 82 83 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); 84 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); 85 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); 86 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); 87 88 union ieee754dp ieee754dp_abs(union ieee754dp x); 89 union ieee754dp ieee754dp_neg(union ieee754dp x); 90 91 union ieee754dp ieee754dp_fint(int x); 92 union ieee754dp ieee754dp_flong(s64 x); 93 union ieee754dp ieee754dp_fsp(union ieee754sp x); 94 95 int ieee754dp_tint(union ieee754dp x); 96 s64 ieee754dp_tlong(union ieee754dp x); 97 98 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); 99 100 union ieee754dp ieee754dp_sqrt(union ieee754dp x); 101 102 103 104 /* 5 types of floating point number 105 */ 106 enum { 107 IEEE754_CLASS_NORM = 0x00, 108 IEEE754_CLASS_ZERO = 0x01, 109 IEEE754_CLASS_DNORM = 0x02, 110 IEEE754_CLASS_INF = 0x03, 111 IEEE754_CLASS_SNAN = 0x04, 112 IEEE754_CLASS_QNAN = 0x05, 113 }; 114 115 /* exception numbers */ 116 #define IEEE754_INEXACT 0x01 117 #define IEEE754_UNDERFLOW 0x02 118 #define IEEE754_OVERFLOW 0x04 119 #define IEEE754_ZERO_DIVIDE 0x08 120 #define IEEE754_INVALID_OPERATION 0x10 121 122 /* cmp operators 123 */ 124 #define IEEE754_CLT 0x01 125 #define IEEE754_CEQ 0x02 126 #define IEEE754_CGT 0x04 127 #define IEEE754_CUN 0x08 128 129 /* 130 * The control status register 131 */ 132 struct _ieee754_csr { 133 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ 134 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ 135 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ 136 __BITFIELD_FIELD(unsigned pad0:3, 137 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ 138 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ 139 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ 140 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ 141 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ 142 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ 143 ;)))))))))) 144 }; 145 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 146 147 static inline unsigned ieee754_getrm(void) 148 { 149 return (ieee754_csr.rm); 150 } 151 static inline unsigned ieee754_setrm(unsigned rm) 152 { 153 return (ieee754_csr.rm = rm); 154 } 155 156 /* 157 * get current exceptions 158 */ 159 static inline unsigned ieee754_getcx(void) 160 { 161 return (ieee754_csr.cx); 162 } 163 164 /* test for current exception condition 165 */ 166 static inline int ieee754_cxtest(unsigned n) 167 { 168 return (ieee754_csr.cx & n); 169 } 170 171 /* 172 * get sticky exceptions 173 */ 174 static inline unsigned ieee754_getsx(void) 175 { 176 return (ieee754_csr.sx); 177 } 178 179 /* clear sticky conditions 180 */ 181 static inline unsigned ieee754_clrsx(void) 182 { 183 return (ieee754_csr.sx = 0); 184 } 185 186 /* test for sticky exception condition 187 */ 188 static inline int ieee754_sxtest(unsigned n) 189 { 190 return (ieee754_csr.sx & n); 191 } 192 193 /* debugging */ 194 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 195 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 196 197 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ 198 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ 199 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ 200 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ 201 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ 202 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ 203 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ 204 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ 205 #define IEEE754_SPCVAL_INDEF 8 /* quiet NaN */ 206 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */ 207 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */ 208 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */ 209 #define IEEE754_SPCVAL_NMIN 12 /* -min norm */ 210 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */ 211 #define IEEE754_SPCVAL_NMIND 14 /* -min denorm */ 212 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */ 213 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */ 214 215 extern const union ieee754dp __ieee754dp_spcvals[]; 216 extern const union ieee754sp __ieee754sp_spcvals[]; 217 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) 218 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) 219 220 /* 221 * Return infinity with given sign 222 */ 223 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 224 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 225 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 226 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 227 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF]) 228 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 229 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 230 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 231 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) 232 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) 233 234 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 235 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 236 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 237 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 238 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF]) 239 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 240 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 241 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 242 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) 243 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) 244 245 /* 246 * Indefinite integer value 247 */ 248 static inline int ieee754si_indef(void) 249 { 250 return INT_MAX; 251 } 252 253 static inline s64 ieee754di_indef(void) 254 { 255 return S64_MAX; 256 } 257 258 /* result types for xctx.rt */ 259 #define IEEE754_RT_SP 0 260 #define IEEE754_RT_DP 1 261 #define IEEE754_RT_XP 2 262 #define IEEE754_RT_SI 3 263 #define IEEE754_RT_DI 4 264 265 /* compat */ 266 #define ieee754dp_fix(x) ieee754dp_tint(x) 267 #define ieee754sp_fix(x) ieee754sp_tint(x) 268 269 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 270