cpufunc.h revision 78903
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 * $FreeBSD: head/sys/i386/include/cpufunc.h 78903 2001-06-28 02:08:13Z bsd $ 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 45__BEGIN_DECLS 46#define readb(va) (*(volatile u_int8_t *) (va)) 47#define readw(va) (*(volatile u_int16_t *) (va)) 48#define readl(va) (*(volatile u_int32_t *) (va)) 49 50#define writeb(va, d) (*(volatile u_int8_t *) (va) = (d)) 51#define writew(va, d) (*(volatile u_int16_t *) (va) = (d)) 52#define writel(va, d) (*(volatile u_int32_t *) (va) = (d)) 53 54#ifdef __GNUC__ 55 56#ifdef SWTCH_OPTIM_STATS 57extern int tlb_flush_count; /* XXX */ 58#endif 59 60static __inline void 61breakpoint(void) 62{ 63 __asm __volatile("int $3"); 64} 65 66static __inline u_int 67bsfl(u_int mask) 68{ 69 u_int result; 70 71 __asm __volatile("bsfl %0,%0" : "=r" (result) : "0" (mask)); 72 return (result); 73} 74 75static __inline u_int 76bsrl(u_int mask) 77{ 78 u_int result; 79 80 __asm __volatile("bsrl %0,%0" : "=r" (result) : "0" (mask)); 81 return (result); 82} 83 84static __inline void 85disable_intr(void) 86{ 87 __asm __volatile("cli" : : : "memory"); 88} 89 90static __inline void 91enable_intr(void) 92{ 93 __asm __volatile("sti"); 94} 95 96#define HAVE_INLINE_FFS 97 98static __inline int 99ffs(int mask) 100{ 101 /* 102 * Note that gcc-2's builtin ffs would be used if we didn't declare 103 * this inline or turn off the builtin. The builtin is faster but 104 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later 105 * versions. 106 */ 107 return (mask == 0 ? mask : bsfl((u_int)mask) + 1); 108} 109 110#define HAVE_INLINE_FLS 111 112static __inline int 113fls(int mask) 114{ 115 return (mask == 0 ? mask : bsrl((u_int)mask) + 1); 116} 117 118#if __GNUC__ < 2 119 120#define inb(port) inbv(port) 121#define outb(port, data) outbv(port, data) 122 123#else /* __GNUC >= 2 */ 124 125/* 126 * The following complications are to get around gcc not having a 127 * constraint letter for the range 0..255. We still put "d" in the 128 * constraint because "i" isn't a valid constraint when the port 129 * isn't constant. This only matters for -O0 because otherwise 130 * the non-working version gets optimized away. 131 * 132 * Use an expression-statement instead of a conditional expression 133 * because gcc-2.6.0 would promote the operands of the conditional 134 * and produce poor code for "if ((inb(var) & const1) == const2)". 135 * 136 * The unnecessary test `(port) < 0x10000' is to generate a warning if 137 * the `port' has type u_short or smaller. Such types are pessimal. 138 * This actually only works for signed types. The range check is 139 * careful to avoid generating warnings. 140 */ 141#define inb(port) __extension__ ({ \ 142 u_char _data; \ 143 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \ 144 && (port) < 0x10000) \ 145 _data = inbc(port); \ 146 else \ 147 _data = inbv(port); \ 148 _data; }) 149 150#define outb(port, data) ( \ 151 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \ 152 && (port) < 0x10000 \ 153 ? outbc(port, data) : outbv(port, data)) 154 155static __inline u_char 156inbc(u_int port) 157{ 158 u_char data; 159 160 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 161 return (data); 162} 163 164static __inline void 165outbc(u_int port, u_char data) 166{ 167 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port))); 168} 169 170#endif /* __GNUC <= 2 */ 171 172static __inline u_char 173inbv(u_int port) 174{ 175 u_char data; 176 /* 177 * We use %%dx and not %1 here because i/o is done at %dx and not at 178 * %edx, while gcc generates inferior code (movw instead of movl) 179 * if we tell it to load (u_short) port. 180 */ 181 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 182 return (data); 183} 184 185static __inline u_int 186inl(u_int port) 187{ 188 u_int data; 189 190 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port)); 191 return (data); 192} 193 194static __inline void 195insb(u_int port, void *addr, size_t cnt) 196{ 197 __asm __volatile("cld; rep; insb" 198 : "=D" (addr), "=c" (cnt) 199 : "0" (addr), "1" (cnt), "d" (port) 200 : "memory"); 201} 202 203static __inline void 204insw(u_int port, void *addr, size_t cnt) 205{ 206 __asm __volatile("cld; rep; insw" 207 : "=D" (addr), "=c" (cnt) 208 : "0" (addr), "1" (cnt), "d" (port) 209 : "memory"); 210} 211 212static __inline void 213insl(u_int port, void *addr, size_t cnt) 214{ 215 __asm __volatile("cld; rep; insl" 216 : "=D" (addr), "=c" (cnt) 217 : "0" (addr), "1" (cnt), "d" (port) 218 : "memory"); 219} 220 221static __inline void 222invd(void) 223{ 224 __asm __volatile("invd"); 225} 226 227#if defined(SMP) && defined(_KERNEL) 228 229/* 230 * When using APIC IPI's, invlpg() is not simply the invlpg instruction 231 * (this is a bug) and the inlining cost is prohibitive since the call 232 * executes into the IPI transmission system. 233 */ 234void invlpg __P((u_int addr)); 235void invltlb __P((void)); 236 237static __inline void 238cpu_invlpg(void *addr) 239{ 240 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory"); 241} 242 243static __inline void 244cpu_invltlb(void) 245{ 246 u_int temp; 247 /* 248 * This should be implemented as load_cr3(rcr3()) when load_cr3() 249 * is inlined. 250 */ 251 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp) 252 : : "memory"); 253#if defined(SWTCH_OPTIM_STATS) 254 ++tlb_flush_count; 255#endif 256} 257 258#else /* !(SMP && _KERNEL) */ 259 260static __inline void 261invlpg(u_int addr) 262{ 263 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory"); 264} 265 266static __inline void 267invltlb(void) 268{ 269 u_int temp; 270 /* 271 * This should be implemented as load_cr3(rcr3()) when load_cr3() 272 * is inlined. 273 */ 274 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp) 275 : : "memory"); 276#ifdef SWTCH_OPTIM_STATS 277 ++tlb_flush_count; 278#endif 279} 280 281#endif /* SMP && _KERNEL */ 282 283static __inline u_short 284inw(u_int port) 285{ 286 u_short data; 287 288 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port)); 289 return (data); 290} 291 292static __inline void 293outbv(u_int port, u_char data) 294{ 295 u_char al; 296 /* 297 * Use an unnecessary assignment to help gcc's register allocator. 298 * This make a large difference for gcc-1.40 and a tiny difference 299 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 300 * best results. gcc-2.6.0 can't handle this. 301 */ 302 al = data; 303 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 304} 305 306static __inline void 307outl(u_int port, u_int data) 308{ 309 /* 310 * outl() and outw() aren't used much so we haven't looked at 311 * possible micro-optimizations such as the unnecessary 312 * assignment for them. 313 */ 314 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port)); 315} 316 317static __inline void 318outsb(u_int port, const void *addr, size_t cnt) 319{ 320 __asm __volatile("cld; rep; outsb" 321 : "=S" (addr), "=c" (cnt) 322 : "0" (addr), "1" (cnt), "d" (port)); 323} 324 325static __inline void 326outsw(u_int port, const void *addr, size_t cnt) 327{ 328 __asm __volatile("cld; rep; outsw" 329 : "=S" (addr), "=c" (cnt) 330 : "0" (addr), "1" (cnt), "d" (port)); 331} 332 333static __inline void 334outsl(u_int port, const void *addr, size_t cnt) 335{ 336 __asm __volatile("cld; rep; outsl" 337 : "=S" (addr), "=c" (cnt) 338 : "0" (addr), "1" (cnt), "d" (port)); 339} 340 341static __inline void 342outw(u_int port, u_short data) 343{ 344 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port)); 345} 346 347static __inline u_int 348rcr2(void) 349{ 350 u_int data; 351 352 __asm __volatile("movl %%cr2,%0" : "=r" (data)); 353 return (data); 354} 355 356static __inline u_int 357read_eflags(void) 358{ 359 u_int ef; 360 361 __asm __volatile("pushfl; popl %0" : "=r" (ef)); 362 return (ef); 363} 364 365static __inline u_int64_t 366rdmsr(u_int msr) 367{ 368 u_int64_t rv; 369 370 __asm __volatile("rdmsr" : "=A" (rv) : "c" (msr)); 371 return (rv); 372} 373 374static __inline u_int64_t 375rdpmc(u_int pmc) 376{ 377 u_int64_t rv; 378 379 __asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc)); 380 return (rv); 381} 382 383static __inline u_int64_t 384rdtsc(void) 385{ 386 u_int64_t rv; 387 388 __asm __volatile("rdtsc" : "=A" (rv)); 389 return (rv); 390} 391 392static __inline void 393wbinvd(void) 394{ 395 __asm __volatile("wbinvd"); 396} 397 398static __inline void 399write_eflags(u_int ef) 400{ 401 __asm __volatile("pushl %0; popfl" : : "r" (ef)); 402} 403 404static __inline void 405wrmsr(u_int msr, u_int64_t newval) 406{ 407 __asm __volatile("wrmsr" : : "A" (newval), "c" (msr)); 408} 409 410static __inline u_int 411rfs(void) 412{ 413 u_int sel; 414 __asm __volatile("movl %%fs,%0" : "=rm" (sel)); 415 return (sel); 416} 417 418static __inline u_int 419rgs(void) 420{ 421 u_int sel; 422 __asm __volatile("movl %%gs,%0" : "=rm" (sel)); 423 return (sel); 424} 425 426static __inline void 427load_fs(u_int sel) 428{ 429 __asm __volatile("movl %0,%%fs" : : "rm" (sel)); 430} 431 432static __inline void 433load_gs(u_int sel) 434{ 435 __asm __volatile("movl %0,%%gs" : : "rm" (sel)); 436} 437 438static __inline u_int 439rdr0(void) 440{ 441 u_int data; 442 __asm __volatile("movl %%dr0,%0" : "=r" (data)); 443 return (data); 444} 445 446static __inline void 447load_dr0(u_int sel) 448{ 449 __asm __volatile("movl %0,%%dr0" : : "r" (sel)); 450} 451 452static __inline u_int 453rdr1(void) 454{ 455 u_int data; 456 __asm __volatile("movl %%dr1,%0" : "=r" (data)); 457 return (data); 458} 459 460static __inline void 461load_dr1(u_int sel) 462{ 463 __asm __volatile("movl %0,%%dr1" : : "r" (sel)); 464} 465 466static __inline u_int 467rdr2(void) 468{ 469 u_int data; 470 __asm __volatile("movl %%dr2,%0" : "=r" (data)); 471 return (data); 472} 473 474static __inline void 475load_dr2(u_int sel) 476{ 477 __asm __volatile("movl %0,%%dr2" : : "r" (sel)); 478} 479 480static __inline u_int 481rdr3(void) 482{ 483 u_int data; 484 __asm __volatile("movl %%dr3,%0" : "=r" (data)); 485 return (data); 486} 487 488static __inline void 489load_dr3(u_int sel) 490{ 491 __asm __volatile("movl %0,%%dr3" : : "r" (sel)); 492} 493 494static __inline u_int 495rdr4(void) 496{ 497 u_int data; 498 __asm __volatile("movl %%dr4,%0" : "=r" (data)); 499 return (data); 500} 501 502static __inline void 503load_dr4(u_int sel) 504{ 505 __asm __volatile("movl %0,%%dr4" : : "r" (sel)); 506} 507 508static __inline u_int 509rdr5(void) 510{ 511 u_int data; 512 __asm __volatile("movl %%dr5,%0" : "=r" (data)); 513 return (data); 514} 515 516static __inline void 517load_dr5(u_int sel) 518{ 519 __asm __volatile("movl %0,%%dr5" : : "r" (sel)); 520} 521 522static __inline u_int 523rdr6(void) 524{ 525 u_int data; 526 __asm __volatile("movl %%dr6,%0" : "=r" (data)); 527 return (data); 528} 529 530static __inline void 531load_dr6(u_int sel) 532{ 533 __asm __volatile("movl %0,%%dr6" : : "r" (sel)); 534} 535 536static __inline u_int 537rdr7(void) 538{ 539 u_int data; 540 __asm __volatile("movl %%dr7,%0" : "=r" (data)); 541 return (data); 542} 543 544static __inline void 545load_dr7(u_int sel) 546{ 547 __asm __volatile("movl %0,%%dr7" : : "r" (sel)); 548} 549 550static __inline critical_t 551critical_enter(void) 552{ 553 critical_t eflags; 554 555 eflags = read_eflags(); 556 disable_intr(); 557 return (eflags); 558} 559 560static __inline void 561critical_exit(critical_t eflags) 562{ 563 write_eflags(eflags); 564} 565 566#else /* !__GNUC__ */ 567 568int breakpoint __P((void)); 569u_int bsfl __P((u_int mask)); 570u_int bsrl __P((u_int mask)); 571void disable_intr __P((void)); 572void enable_intr __P((void)); 573u_char inb __P((u_int port)); 574u_int inl __P((u_int port)); 575void insb __P((u_int port, void *addr, size_t cnt)); 576void insl __P((u_int port, void *addr, size_t cnt)); 577void insw __P((u_int port, void *addr, size_t cnt)); 578void invd __P((void)); 579void invlpg __P((u_int addr)); 580void invltlb __P((void)); 581u_short inw __P((u_int port)); 582void outb __P((u_int port, u_char data)); 583void outl __P((u_int port, u_int data)); 584void outsb __P((u_int port, void *addr, size_t cnt)); 585void outsl __P((u_int port, void *addr, size_t cnt)); 586void outsw __P((u_int port, void *addr, size_t cnt)); 587void outw __P((u_int port, u_short data)); 588u_int rcr2 __P((void)); 589u_int64_t rdmsr __P((u_int msr)); 590u_int64_t rdpmc __P((u_int pmc)); 591u_int64_t rdtsc __P((void)); 592u_int read_eflags __P((void)); 593void wbinvd __P((void)); 594void write_eflags __P((u_int ef)); 595void wrmsr __P((u_int msr, u_int64_t newval)); 596u_int rfs __P((void)); 597u_int rgs __P((void)); 598void load_fs __P((u_int sel)); 599void load_gs __P((u_int sel)); 600critical_t critical_enter __P((void)); 601void critical_exit __P((critical_t eflags)); 602 603#endif /* __GNUC__ */ 604 605void load_cr0 __P((u_int cr0)); 606void load_cr3 __P((u_int cr3)); 607void load_cr4 __P((u_int cr4)); 608void ltr __P((u_short sel)); 609u_int rcr0 __P((void)); 610u_int rcr3 __P((void)); 611u_int rcr4 __P((void)); 612void reset_dbregs __P((void)); 613__END_DECLS 614 615#endif /* !_MACHINE_CPUFUNC_H_ */ 616