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 union ieee754sp ieee754sp_maddf(union ieee754sp z, union ieee754sp x, 79 union ieee754sp y); 80 union ieee754sp ieee754sp_msubf(union ieee754sp z, union ieee754sp x, 81 union ieee754sp y); 82 int ieee754sp_2008class(union ieee754sp x); 83 84 /* 85 * double precision (often aka double) 86 */ 87 int ieee754dp_class(union ieee754dp x); 88 89 union ieee754dp ieee754dp_add(union ieee754dp x, union ieee754dp y); 90 union ieee754dp ieee754dp_sub(union ieee754dp x, union ieee754dp y); 91 union ieee754dp ieee754dp_mul(union ieee754dp x, union ieee754dp y); 92 union ieee754dp ieee754dp_div(union ieee754dp x, union ieee754dp y); 93 94 union ieee754dp ieee754dp_abs(union ieee754dp x); 95 union ieee754dp ieee754dp_neg(union ieee754dp x); 96 97 union ieee754dp ieee754dp_fint(int x); 98 union ieee754dp ieee754dp_flong(s64 x); 99 union ieee754dp ieee754dp_fsp(union ieee754sp x); 100 101 int ieee754dp_tint(union ieee754dp x); 102 s64 ieee754dp_tlong(union ieee754dp x); 103 104 int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cop, int sig); 105 106 union ieee754dp ieee754dp_sqrt(union ieee754dp x); 107 108 union ieee754dp ieee754dp_maddf(union ieee754dp z, union ieee754dp x, 109 union ieee754dp y); 110 union ieee754dp ieee754dp_msubf(union ieee754dp z, union ieee754dp x, 111 union ieee754dp y); 112 int ieee754dp_2008class(union ieee754dp x); 113 114 115 /* 5 types of floating point number 116 */ 117 enum { 118 IEEE754_CLASS_NORM = 0x00, 119 IEEE754_CLASS_ZERO = 0x01, 120 IEEE754_CLASS_DNORM = 0x02, 121 IEEE754_CLASS_INF = 0x03, 122 IEEE754_CLASS_SNAN = 0x04, 123 IEEE754_CLASS_QNAN = 0x05, 124 }; 125 126 /* exception numbers */ 127 #define IEEE754_INEXACT 0x01 128 #define IEEE754_UNDERFLOW 0x02 129 #define IEEE754_OVERFLOW 0x04 130 #define IEEE754_ZERO_DIVIDE 0x08 131 #define IEEE754_INVALID_OPERATION 0x10 132 133 /* cmp operators 134 */ 135 #define IEEE754_CLT 0x01 136 #define IEEE754_CEQ 0x02 137 #define IEEE754_CGT 0x04 138 #define IEEE754_CUN 0x08 139 140 /* 141 * The control status register 142 */ 143 struct _ieee754_csr { 144 __BITFIELD_FIELD(unsigned fcc:7, /* condition[7:1] */ 145 __BITFIELD_FIELD(unsigned nod:1, /* set 1 for no denormals */ 146 __BITFIELD_FIELD(unsigned c:1, /* condition[0] */ 147 __BITFIELD_FIELD(unsigned pad0:3, 148 __BITFIELD_FIELD(unsigned abs2008:1, /* IEEE 754-2008 ABS/NEG.fmt */ 149 __BITFIELD_FIELD(unsigned nan2008:1, /* IEEE 754-2008 NaN mode */ 150 __BITFIELD_FIELD(unsigned cx:6, /* exceptions this operation */ 151 __BITFIELD_FIELD(unsigned mx:5, /* exception enable mask */ 152 __BITFIELD_FIELD(unsigned sx:5, /* exceptions total */ 153 __BITFIELD_FIELD(unsigned rm:2, /* current rounding mode */ 154 ;)))))))))) 155 }; 156 #define ieee754_csr (*(struct _ieee754_csr *)(¤t->thread.fpu.fcr31)) 157 158 static inline unsigned ieee754_getrm(void) 159 { 160 return (ieee754_csr.rm); 161 } 162 static inline unsigned ieee754_setrm(unsigned rm) 163 { 164 return (ieee754_csr.rm = rm); 165 } 166 167 /* 168 * get current exceptions 169 */ 170 static inline unsigned ieee754_getcx(void) 171 { 172 return (ieee754_csr.cx); 173 } 174 175 /* test for current exception condition 176 */ 177 static inline int ieee754_cxtest(unsigned n) 178 { 179 return (ieee754_csr.cx & n); 180 } 181 182 /* 183 * get sticky exceptions 184 */ 185 static inline unsigned ieee754_getsx(void) 186 { 187 return (ieee754_csr.sx); 188 } 189 190 /* clear sticky conditions 191 */ 192 static inline unsigned ieee754_clrsx(void) 193 { 194 return (ieee754_csr.sx = 0); 195 } 196 197 /* test for sticky exception condition 198 */ 199 static inline int ieee754_sxtest(unsigned n) 200 { 201 return (ieee754_csr.sx & n); 202 } 203 204 /* debugging */ 205 union ieee754sp ieee754sp_dump(char *s, union ieee754sp x); 206 union ieee754dp ieee754dp_dump(char *s, union ieee754dp x); 207 208 #define IEEE754_SPCVAL_PZERO 0 /* +0.0 */ 209 #define IEEE754_SPCVAL_NZERO 1 /* -0.0 */ 210 #define IEEE754_SPCVAL_PONE 2 /* +1.0 */ 211 #define IEEE754_SPCVAL_NONE 3 /* -1.0 */ 212 #define IEEE754_SPCVAL_PTEN 4 /* +10.0 */ 213 #define IEEE754_SPCVAL_NTEN 5 /* -10.0 */ 214 #define IEEE754_SPCVAL_PINFINITY 6 /* +inf */ 215 #define IEEE754_SPCVAL_NINFINITY 7 /* -inf */ 216 #define IEEE754_SPCVAL_INDEF 8 /* quiet NaN */ 217 #define IEEE754_SPCVAL_PMAX 9 /* +max norm */ 218 #define IEEE754_SPCVAL_NMAX 10 /* -max norm */ 219 #define IEEE754_SPCVAL_PMIN 11 /* +min norm */ 220 #define IEEE754_SPCVAL_NMIN 12 /* -min norm */ 221 #define IEEE754_SPCVAL_PMIND 13 /* +min denorm */ 222 #define IEEE754_SPCVAL_NMIND 14 /* -min denorm */ 223 #define IEEE754_SPCVAL_P1E31 15 /* + 1.0e31 */ 224 #define IEEE754_SPCVAL_P1E63 16 /* + 1.0e63 */ 225 226 extern const union ieee754dp __ieee754dp_spcvals[]; 227 extern const union ieee754sp __ieee754sp_spcvals[]; 228 #define ieee754dp_spcvals ((const union ieee754dp *)__ieee754dp_spcvals) 229 #define ieee754sp_spcvals ((const union ieee754sp *)__ieee754sp_spcvals) 230 231 /* 232 * Return infinity with given sign 233 */ 234 #define ieee754dp_inf(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 235 #define ieee754dp_zero(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 236 #define ieee754dp_one(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 237 #define ieee754dp_ten(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 238 #define ieee754dp_indef() (ieee754dp_spcvals[IEEE754_SPCVAL_INDEF]) 239 #define ieee754dp_max(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 240 #define ieee754dp_min(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 241 #define ieee754dp_mind(sn) (ieee754dp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 242 #define ieee754dp_1e31() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E31]) 243 #define ieee754dp_1e63() (ieee754dp_spcvals[IEEE754_SPCVAL_P1E63]) 244 245 #define ieee754sp_inf(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PINFINITY+(sn)]) 246 #define ieee754sp_zero(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PZERO+(sn)]) 247 #define ieee754sp_one(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PONE+(sn)]) 248 #define ieee754sp_ten(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PTEN+(sn)]) 249 #define ieee754sp_indef() (ieee754sp_spcvals[IEEE754_SPCVAL_INDEF]) 250 #define ieee754sp_max(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMAX+(sn)]) 251 #define ieee754sp_min(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIN+(sn)]) 252 #define ieee754sp_mind(sn) (ieee754sp_spcvals[IEEE754_SPCVAL_PMIND+(sn)]) 253 #define ieee754sp_1e31() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E31]) 254 #define ieee754sp_1e63() (ieee754sp_spcvals[IEEE754_SPCVAL_P1E63]) 255 256 /* 257 * Indefinite integer value 258 */ 259 static inline int ieee754si_indef(void) 260 { 261 return INT_MAX; 262 } 263 264 static inline s64 ieee754di_indef(void) 265 { 266 return S64_MAX; 267 } 268 269 /* result types for xctx.rt */ 270 #define IEEE754_RT_SP 0 271 #define IEEE754_RT_DP 1 272 #define IEEE754_RT_XP 2 273 #define IEEE754_RT_SI 3 274 #define IEEE754_RT_DI 4 275 276 /* compat */ 277 #define ieee754dp_fix(x) ieee754dp_tint(x) 278 #define ieee754sp_fix(x) ieee754sp_tint(x) 279 280 #endif /* __ARCH_MIPS_MATH_EMU_IEEE754_H */ 281