1 /*- 2 * Copyright (c) 1993 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: cpufunc.h,v 1.58 1996/09/28 22:37:57 dyson Exp $ 34 */ 35 36 /* 37 * Functions to provide access to special i386 instructions. 38 */ 39 40 #ifndef _MACHINE_CPUFUNC_H_ 41 #define _MACHINE_CPUFUNC_H_ 42 43 #include <sys/cdefs.h> 44 #include <sys/types.h> 45 46 #ifdef __GNUC__ 47 48 static __inline void 49 breakpoint(void) 50 { 51 __asm __volatile("int $3"); 52 } 53 54 static __inline void 55 disable_intr(void) 56 { 57 __asm __volatile("cli" : : : "memory"); 58 } 59 60 static __inline void 61 enable_intr(void) 62 { 63 __asm __volatile("sti"); 64 } 65 66 #define HAVE_INLINE_FFS 67 68 static __inline int 69 ffs(int mask) 70 { 71 int result; 72 /* 73 * bsfl turns out to be not all that slow on 486's. It can beaten 74 * using a binary search to reduce to 4 bits and then a table lookup, 75 * but only if the code is inlined and in the cache, and the code 76 * is quite large so inlining it probably busts the cache. 77 * 78 * Note that gcc-2's builtin ffs would be used if we didn't declare 79 * this inline or turn off the builtin. The builtin is faster but 80 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and 2.6. 81 */ 82 __asm __volatile("testl %0,%0; je 1f; bsfl %0,%0; incl %0; 1:" 83 : "=r" (result) : "0" (mask)); 84 return (result); 85 } 86 87 #define HAVE_INLINE_FLS 88 89 static __inline int 90 fls(int mask) 91 { 92 int result; 93 __asm __volatile("testl %0,%0; je 1f; bsrl %0,%0; incl %0; 1:" 94 : "=r" (result) : "0" (mask)); 95 return (result); 96 } 97 98 #if __GNUC__ < 2 99 100 #define inb(port) inbv(port) 101 #define outb(port, data) outbv(port, data) 102 103 #else /* __GNUC >= 2 */ 104 105 /* 106 * The following complications are to get around gcc not having a 107 * constraint letter for the range 0..255. We still put "d" in the 108 * constraint because "i" isn't a valid constraint when the port 109 * isn't constant. This only matters for -O0 because otherwise 110 * the non-working version gets optimized away. 111 * 112 * Use an expression-statement instead of a conditional expression 113 * because gcc-2.6.0 would promote the operands of the conditional 114 * and produce poor code for "if ((inb(var) & const1) == const2)". 115 * 116 * The unnecessary test `(port) < 0x10000' is to generate a warning if 117 * the `port' has type u_short or smaller. Such types are pessimal. 118 * This actually only works for signed types. The range check is 119 * careful to avoid generating warnings. 120 */ 121 #define inb(port) __extension__ ({ \ 122 u_char _data; \ 123 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \ 124 && (port) < 0x10000) \ 125 _data = inbc(port); \ 126 else \ 127 _data = inbv(port); \ 128 _data; }) 129 130 #define outb(port, data) ( \ 131 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \ 132 && (port) < 0x10000 \ 133 ? outbc(port, data) : outbv(port, data)) 134 135 static __inline u_char 136 inbc(u_int port) 137 { 138 u_char data; 139 140 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 141 return (data); 142 } 143 144 static __inline void 145 outbc(u_int port, u_char data) 146 { 147 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port))); 148 } 149 150 #endif /* __GNUC <= 2 */ 151 152 static __inline u_char 153 inbv(u_int port) 154 { 155 u_char data; 156 /* 157 * We use %%dx and not %1 here because i/o is done at %dx and not at 158 * %edx, while gcc generates inferior code (movw instead of movl) 159 * if we tell it to load (u_short) port. 160 */ 161 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 162 return (data); 163 } 164 165 static __inline u_long 166 inl(u_int port) 167 { 168 u_long data; 169 170 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port)); 171 return (data); 172 } 173 174 static __inline void 175 insb(u_int port, void *addr, size_t cnt) 176 { 177 __asm __volatile("cld; rep; insb" 178 : : "d" (port), "D" (addr), "c" (cnt) 179 : "di", "cx", "memory"); 180 } 181 182 static __inline void 183 insw(u_int port, void *addr, size_t cnt) 184 { 185 __asm __volatile("cld; rep; insw" 186 : : "d" (port), "D" (addr), "c" (cnt) 187 : "di", "cx", "memory"); 188 } 189 190 static __inline void 191 insl(u_int port, void *addr, size_t cnt) 192 { 193 __asm __volatile("cld; rep; insl" 194 : : "d" (port), "D" (addr), "c" (cnt) 195 : "di", "cx", "memory"); 196 } 197 198 static __inline void 199 invlpg(u_int addr) 200 { 201 __asm __volatile("invlpg (%0)" : : "r" (addr) : "memory"); 202 } 203 204 static __inline void 205 invltlb(void) 206 { 207 u_long temp; 208 /* 209 * This should be implemented as load_cr3(rcr3()) when load_cr3() 210 * is inlined. 211 */ 212 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp) 213 : : "memory"); 214 } 215 216 static __inline u_short 217 inw(u_int port) 218 { 219 u_short data; 220 221 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port)); 222 return (data); 223 } 224 225 static __inline u_int 226 loadandclear(u_int *addr) 227 { 228 u_int result; 229 230 __asm __volatile("xorl %0,%0; xchgl %1,%0" 231 : "=&r" (result) : "m" (*addr)); 232 return (result); 233 } 234 235 static __inline void 236 outbv(u_int port, u_char data) 237 { 238 u_char al; 239 /* 240 * Use an unnecessary assignment to help gcc's register allocator. 241 * This make a large difference for gcc-1.40 and a tiny difference 242 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 243 * best results. gcc-2.6.0 can't handle this. 244 */ 245 al = data; 246 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 247 } 248 249 static __inline void 250 outl(u_int port, u_long data) 251 { 252 /* 253 * outl() and outw() aren't used much so we haven't looked at 254 * possible micro-optimizations such as the unnecessary 255 * assignment for them. 256 */ 257 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port)); 258 } 259 260 static __inline void 261 outsb(u_int port, void *addr, size_t cnt) 262 { 263 __asm __volatile("cld; rep; outsb" 264 : : "d" (port), "S" (addr), "c" (cnt) 265 : "si", "cx"); 266 } 267 268 static __inline void 269 outsw(u_int port, void *addr, size_t cnt) 270 { 271 __asm __volatile("cld; rep; outsw" 272 : : "d" (port), "S" (addr), "c" (cnt) 273 : "si", "cx"); 274 } 275 276 static __inline void 277 outsl(u_int port, void *addr, size_t cnt) 278 { 279 __asm __volatile("cld; rep; outsl" 280 : : "d" (port), "S" (addr), "c" (cnt) 281 : "si", "cx"); 282 } 283 284 static __inline void 285 outw(u_int port, u_short data) 286 { 287 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port)); 288 } 289 290 static __inline u_long 291 rcr2(void) 292 { 293 u_long data; 294 295 __asm __volatile("movl %%cr2,%0" : "=r" (data)); 296 return (data); 297 } 298 299 static __inline u_long 300 read_eflags(void) 301 { 302 u_long ef; 303 304 __asm __volatile("pushfl; popl %0" : "=r" (ef)); 305 return (ef); 306 } 307 308 static __inline quad_t 309 rdmsr(u_int msr) 310 { 311 quad_t rv; 312 313 __asm __volatile(".byte 0x0f, 0x32" : "=A" (rv) : "c" (msr)); 314 return (rv); 315 } 316 317 static __inline quad_t 318 rdpmc(u_int pmc) 319 { 320 quad_t rv; 321 322 __asm __volatile(".byte 0x0f, 0x33" : "=A" (rv) : "c" (pmc)); 323 return (rv); 324 } 325 326 static __inline quad_t 327 rdtsc(void) 328 { 329 quad_t rv; 330 331 __asm __volatile(".byte 0x0f, 0x31" : "=A" (rv)); 332 return (rv); 333 } 334 335 static __inline void 336 setbits(volatile unsigned *addr, u_int bits) 337 { 338 __asm __volatile("orl %1,%0" : "=m" (*addr) : "ir" (bits)); 339 } 340 341 static __inline void 342 write_eflags(u_long ef) 343 { 344 __asm __volatile("pushl %0; popfl" : : "r" (ef)); 345 } 346 347 static __inline void 348 wrmsr(u_int msr, quad_t newval) 349 { 350 __asm __volatile(".byte 0x0f, 0x30" : : "A" (newval), "c" (msr)); 351 } 352 353 #else /* !__GNUC__ */ 354 355 int breakpoint __P((void)); 356 void disable_intr __P((void)); 357 void enable_intr __P((void)); 358 u_char inb __P((u_int port)); 359 u_long inl __P((u_int port)); 360 void insb __P((u_int port, void *addr, size_t cnt)); 361 void insl __P((u_int port, void *addr, size_t cnt)); 362 void insw __P((u_int port, void *addr, size_t cnt)); 363 void invlpg __P((u_int addr)); 364 void invltlb __P((void)); 365 u_short inw __P((u_int port)); 366 u_int loadandclear __P((u_int *addr)); 367 void outb __P((u_int port, u_char data)); 368 void outl __P((u_int port, u_long data)); 369 void outsb __P((u_int port, void *addr, size_t cnt)); 370 void outsl __P((u_int port, void *addr, size_t cnt)); 371 void outsw __P((u_int port, void *addr, size_t cnt)); 372 void outw __P((u_int port, u_short data)); 373 u_long rcr2 __P((void)); 374 quad_t rdmsr __P((u_int msr)); 375 quad_t rdpmc __P((u_int pmc)); 376 quad_t rdtsc __P((void)); 377 u_long read_eflags __P((void)); 378 void setbits __P((volatile unsigned *addr, u_int bits)); 379 void write_eflags __P((u_long ef)); 380 void wrmsr __P((u_int msr, quad_t newval)); 381 382 #endif /* __GNUC__ */ 383 384 void load_cr0 __P((u_long cr0)); 385 void load_cr3 __P((u_long cr3)); 386 void ltr __P((u_short sel)); 387 u_int rcr0 __P((void)); 388 u_long rcr3 __P((void)); 389 390 #include <machine/spl.h> /* XXX belongs elsewhere */ 391 392 #endif /* !_MACHINE_CPUFUNC_H_ */ 393