cpufunc.h revision 17256
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 1.52 1996/07/01 20:16:09 bde 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 48static __inline void 49breakpoint(void) 50{ 51 __asm __volatile("int $3"); 52} 53 54static __inline void 55disable_intr(void) 56{ 57 __asm __volatile("cli" : : : "memory"); 58} 59 60static __inline void 61enable_intr(void) 62{ 63 __asm __volatile("sti"); 64} 65 66#define HAVE_INLINE_FFS 67 68static __inline int 69ffs(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#if __GNUC__ < 2 88 89#define inb(port) inbv(port) 90#define outb(port, data) outbv(port, data) 91 92#else /* __GNUC >= 2 */ 93 94/* 95 * The following complications are to get around gcc not having a 96 * constraint letter for the range 0..255. We still put "d" in the 97 * constraint because "i" isn't a valid constraint when the port 98 * isn't constant. This only matters for -O0 because otherwise 99 * the non-working version gets optimized away. 100 * 101 * Use an expression-statement instead of a conditional expression 102 * because gcc-2.6.0 would promote the operands of the conditional 103 * and produce poor code for "if ((inb(var) & const1) == const2)". 104 */ 105#define inb(port) ({ \ 106 u_char _data; \ 107 if (__builtin_constant_p((int) (port)) && (port) < 256ul) \ 108 _data = inbc(port); \ 109 else \ 110 _data = inbv(port); \ 111 _data; }) 112 113#define outb(port, data) \ 114 (__builtin_constant_p((int) (port)) && (port) < 256ul \ 115 ? outbc(port, data) : outbv(port, data)) 116 117static __inline u_char 118inbc(u_int port) 119{ 120 u_char data; 121 122 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 123 return (data); 124} 125 126static __inline void 127outbc(u_int port, u_char data) 128{ 129 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port))); 130} 131 132#endif /* __GNUC <= 2 */ 133 134static __inline u_char 135inbv(u_int port) 136{ 137 u_char data; 138 /* 139 * We use %%dx and not %1 here because i/o is done at %dx and not at 140 * %edx, while gcc generates inferior code (movw instead of movl) 141 * if we tell it to load (u_short) port. 142 */ 143 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 144 return (data); 145} 146 147static __inline u_long 148inl(u_int port) 149{ 150 u_long data; 151 152 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port)); 153 return (data); 154} 155 156static __inline void 157insb(u_int port, void *addr, size_t cnt) 158{ 159 __asm __volatile("cld; rep; insb" 160 : : "d" (port), "D" (addr), "c" (cnt) 161 : "di", "cx", "memory"); 162} 163 164static __inline void 165insw(u_int port, void *addr, size_t cnt) 166{ 167 __asm __volatile("cld; rep; insw" 168 : : "d" (port), "D" (addr), "c" (cnt) 169 : "di", "cx", "memory"); 170} 171 172static __inline void 173insl(u_int port, void *addr, size_t cnt) 174{ 175 __asm __volatile("cld; rep; insl" 176 : : "d" (port), "D" (addr), "c" (cnt) 177 : "di", "cx", "memory"); 178} 179 180static __inline u_short 181inw(u_int port) 182{ 183 u_short data; 184 185 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port)); 186 return (data); 187} 188 189static __inline u_int 190loadandclear(u_int *addr) 191{ 192 u_int result; 193 194 __asm __volatile("xorl %0,%0; xchgl %1,%0" 195 : "=&r" (result) : "m" (*addr)); 196 return (result); 197} 198 199static __inline void 200outbv(u_int port, u_char data) 201{ 202 u_char al; 203 /* 204 * Use an unnecessary assignment to help gcc's register allocator. 205 * This make a large difference for gcc-1.40 and a tiny difference 206 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 207 * best results. gcc-2.6.0 can't handle this. 208 */ 209 al = data; 210 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 211} 212 213static __inline void 214outl(u_int port, u_long data) 215{ 216 /* 217 * outl() and outw() aren't used much so we haven't looked at 218 * possible micro-optimizations such as the unnecessary 219 * assignment for them. 220 */ 221 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port)); 222} 223 224static __inline void 225outsb(u_int port, void *addr, size_t cnt) 226{ 227 __asm __volatile("cld; rep; outsb" 228 : : "d" (port), "S" (addr), "c" (cnt) 229 : "si", "cx"); 230} 231 232static __inline void 233outsw(u_int port, void *addr, size_t cnt) 234{ 235 __asm __volatile("cld; rep; outsw" 236 : : "d" (port), "S" (addr), "c" (cnt) 237 : "si", "cx"); 238} 239 240static __inline void 241outsl(u_int port, void *addr, size_t cnt) 242{ 243 __asm __volatile("cld; rep; outsl" 244 : : "d" (port), "S" (addr), "c" (cnt) 245 : "si", "cx"); 246} 247 248static __inline void 249outw(u_int port, u_short data) 250{ 251 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port)); 252} 253 254#ifdef PC98 255#include <machine/spl.h> 256 257static inline u_char 258epson_inb(u_int port) 259{ 260 u_char data; 261 262 outb(0x43f, 0x42); 263 data = inb(port); 264 outb(0x43f, 0x40); 265 return (data); 266} 267 268static inline void 269epson_outb(u_int port, u_char data) 270{ 271 outb(0x43f, 0x42); 272 outb(port,data); 273 outb(0x43f, 0x40); 274} 275 276static inline void 277epson_insw(u_int port, void *addr, size_t cnt) 278{ 279 int s; 280 281 s = splbio(); 282 outb(0x43f, 0x42); 283 disable_intr(); 284 insw((u_int)port, (void *)addr, (size_t)cnt); 285 outb(0x43f, 0x40); 286 splx(s); 287} 288 289static inline void 290epson_outsw(u_int port, void *addr, size_t cnt) 291{ 292 int s; 293 294 s = splbio(); 295 outb(0x43f, 0x42); 296 disable_intr(); 297 outsw((u_int)port, (void *)addr, (size_t)cnt); 298 outb(0x43f, 0x40); 299 splx(s); 300} 301#endif /* PC98 */ 302 303static __inline void 304pmap_update(void) 305{ 306 u_long temp; 307 /* 308 * This should be implemented as load_cr3(rcr3()) when load_cr3() 309 * is inlined. 310 */ 311 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp) 312 : : "memory"); 313} 314 315static __inline u_long 316rcr2(void) 317{ 318 u_long data; 319 320 __asm __volatile("movl %%cr2,%0" : "=r" (data)); 321 return (data); 322} 323 324static __inline u_long 325read_eflags(void) 326{ 327 u_long ef; 328 329 __asm __volatile("pushfl; popl %0" : "=r" (ef)); 330 return (ef); 331} 332 333static __inline quad_t 334rdmsr(u_int msr) 335{ 336 quad_t rv; 337 338 __asm __volatile(".byte 0x0f, 0x32" : "=A" (rv) : "c" (msr)); 339 return (rv); 340} 341 342static __inline quad_t 343rdpmc(u_int pmc) 344{ 345 quad_t rv; 346 347 __asm __volatile(".byte 0x0f, 0x33" : "=A" (rv) : "c" (pmc)); 348 return (rv); 349} 350 351static __inline quad_t 352rdtsc(void) 353{ 354 quad_t rv; 355 356 __asm __volatile(".byte 0x0f, 0x31" : "=A" (rv)); 357 return (rv); 358} 359 360static __inline void 361setbits(volatile unsigned *addr, u_int bits) 362{ 363 __asm __volatile("orl %1,%0" : "=m" (*addr) : "ir" (bits)); 364} 365 366static __inline void 367write_eflags(u_long ef) 368{ 369 __asm __volatile("pushl %0; popfl" : : "r" (ef)); 370} 371 372static __inline void 373wrmsr(u_int msr, quad_t newval) 374{ 375 __asm __volatile(".byte 0x0f, 0x30" : : "A" (newval), "c" (msr)); 376} 377 378#else /* !__GNUC__ */ 379 380int breakpoint __P((void)); 381void disable_intr __P((void)); 382void enable_intr __P((void)); 383u_char inb __P((u_int port)); 384u_long inl __P((u_int port)); 385void insb __P((u_int port, void *addr, size_t cnt)); 386void insl __P((u_int port, void *addr, size_t cnt)); 387void insw __P((u_int port, void *addr, size_t cnt)); 388u_short inw __P((u_int port)); 389u_int loadandclear __P((u_int *addr)); 390void outb __P((u_int port, u_char data)); 391void outl __P((u_int port, u_long data)); 392void outsb __P((u_int port, void *addr, size_t cnt)); 393void outsl __P((u_int port, void *addr, size_t cnt)); 394void outsw __P((u_int port, void *addr, size_t cnt)); 395void outw __P((u_int port, u_short data)); 396void pmap_update __P((void)); 397u_long rcr2 __P((void)); 398quad_t rdmsr __P((u_int msr)); 399quad_t rdpmc __P((u_int pmc)); 400quad_t rdtsc __P((void)); 401u_long read_eflags __P((void)); 402void setbits __P((volatile unsigned *addr, u_int bits)); 403void write_eflags __P((u_long ef)); 404void wrmsr __P((u_int msr, quad_t newval)); 405 406#endif /* __GNUC__ */ 407 408void load_cr0 __P((u_long cr0)); 409void load_cr3 __P((u_long cr3)); 410void ltr __P((u_short sel)); 411u_int rcr0 __P((void)); 412u_long rcr3 __P((void)); 413 414#include <machine/spl.h> /* XXX belongs elsewhere */ 415 416#endif /* !_MACHINE_CPUFUNC_H_ */ 417