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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 /*
33 * Functions to provide access to special i386 instructions.
34 * This in included in sys/systm.h, and that file should be
35 * used in preference to this.
36 */
37
38 #ifndef _MACHINE_CPUFUNC_H_
39 #define _MACHINE_CPUFUNC_H_
40
41 #ifndef _SYS_CDEFS_H_
42 #error this file needs sys/cdefs.h as a prerequisite
43 #endif
44
45 struct region_descriptor;
46
47 #define readb(va) (*(volatile u_int8_t *) (va))
48 #define readw(va) (*(volatile u_int16_t *) (va))
49 #define readl(va) (*(volatile u_int32_t *) (va))
50
51 #define writeb(va, d) (*(volatile u_int8_t *) (va) = (d))
52 #define writew(va, d) (*(volatile u_int16_t *) (va) = (d))
53 #define writel(va, d) (*(volatile u_int32_t *) (va) = (d))
54
55 #if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE)
56
57 static __inline void
58 breakpoint(void)
59 {
60 __asm __volatile("int $3");
61 }
62
63 static __inline u_int
64 bsfl(u_int mask)
65 {
66 u_int result;
67
68 __asm __volatile("bsfl %1,%0" : "=r" (result) : "rm" (mask));
69 return (result);
70 }
71
72 static __inline u_int
73 bsrl(u_int mask)
74 {
75 u_int result;
76
77 __asm __volatile("bsrl %1,%0" : "=r" (result) : "rm" (mask));
78 return (result);
79 }
80
81 static __inline void
82 disable_intr(void)
83 {
84 __asm __volatile("cli" : : : "memory");
85 }
86
87 static __inline void
88 do_cpuid(u_int ax, u_int *p)
89 {
90 __asm __volatile("cpuid"
91 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
92 : "" (ax));
93 }
94
95 static __inline void
96 cpuid_count(u_int ax, u_int cx, u_int *p)
97 {
98 __asm __volatile("cpuid"
99 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
100 : "" (ax), "c" (cx));
101 }
102
103 static __inline void
104 enable_intr(void)
105 {
106 __asm __volatile("sti");
107 }
108
109 #ifdef _KERNEL
110
111 #define HAVE_INLINE_FFS
112
113 static __inline int
114 ffs(int mask)
115 {
116 /*
117 * Note that gcc-2's builtin ffs would be used if we didn't declare
118 * this inline or turn off the builtin. The builtin is faster but
119 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later
120 * versions.
121 */
122 return (mask == 0 ? mask : (int)bsfl((u_int)mask) + 1);
123 }
124
125 #define HAVE_INLINE_FLS
126
127 static __inline int
128 fls(int mask)
129 {
130 return (mask == 0 ? mask : (int)bsrl((u_int)mask) + 1);
131 }
132
133 #endif /* _KERNEL */
134
135 static __inline void
136 halt(void)
137 {
138 __asm __volatile("hlt");
139 }
140
141 #if !defined(__GNUCLIKE_BUILTIN_CONSTANT_P) || __GNUCLIKE_ASM < 3
142
143 #define inb(port) inbv(port)
144 #define outb(port, data) outbv(port, data)
145
146 #else /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3 */
147
148 /*
149 * The following complications are to get around gcc not having a
150 * constraint letter for the range 0..255. We still put "d" in the
151 * constraint because "i" isn't a valid constraint when the port
152 * isn't constant. This only matters for -O0 because otherwise
153 * the non-working version gets optimized away.
154 *
155 * Use an expression-statement instead of a conditional expression
156 * because gcc-2.6.0 would promote the operands of the conditional
157 * and produce poor code for "if ((inb(var) & const1) == const2)".
158 *
159 * The unnecessary test `(port) < 0x10000' is to generate a warning if
160 * the `port' has type u_short or smaller. Such types are pessimal.
161 * This actually only works for signed types. The range check is
162 * careful to avoid generating warnings.
163 */
164 #define inb(port) __extension__ ({ \
165 u_char _data; \
166 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
167 && (port) < 0x10000) \
168 _data = inbc(port); \
169 else \
170 _data = inbv(port); \
171 _data; })
172
173 #define outb(port, data) ( \
174 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
175 && (port) < 0x10000 \
176 ? outbc(port, data) : outbv(port, data))
177
178 static __inline u_char
179 inbc(u_int port)
180 {
181 u_char data;
182
183 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
184 return (data);
185 }
186
187 static __inline void
188 outbc(u_int port, u_char data)
189 {
190 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
191 }
192
193 #endif /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3*/
194
195 static __inline u_char
196 inbv(u_int port)
197 {
198 u_char data;
199 /*
200 * We use %%dx and not %1 here because i/o is done at %dx and not at
201 * %edx, while gcc generates inferior code (movw instead of movl)
202 * if we tell it to load (u_short) port.
203 */
204 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
205 return (data);
206 }
207
208 static __inline u_int
209 inl(u_int port)
210 {
211 u_int data;
212
213 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
214 return (data);
215 }
216
217 static __inline void
218 insb(u_int port, void *addr, size_t cnt)
219 {
220 __asm __volatile("cld; rep; insb"
221 : "+D" (addr), "+c" (cnt)
222 : "d" (port)
223 : "memory");
224 }
225
226 static __inline void
227 insw(u_int port, void *addr, size_t cnt)
228 {
229 __asm __volatile("cld; rep; insw"
230 : "+D" (addr), "+c" (cnt)
231 : "d" (port)
232 : "memory");
233 }
234
235 static __inline void
236 insl(u_int port, void *addr, size_t cnt)
237 {
238 __asm __volatile("cld; rep; insl"
239 : "+D" (addr), "+c" (cnt)
240 : "d" (port)
241 : "memory");
242 }
243
244 static __inline void
245 invd(void)
246 {
247 __asm __volatile("invd");
248 }
249
250 static __inline u_short
251 inw(u_int port)
252 {
253 u_short data;
254
255 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
256 return (data);
257 }
258
259 static __inline void
260 outbv(u_int port, u_char data)
261 {
262 u_char al;
263 /*
264 * Use an unnecessary assignment to help gcc's register allocator.
265 * This make a large difference for gcc-1.40 and a tiny difference
266 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
267 * best results. gcc-2.6.0 can't handle this.
268 */
269 al = data;
270 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
271 }
272
273 static __inline void
274 outl(u_int port, u_int data)
275 {
276 /*
277 * outl() and outw() aren't used much so we haven't looked at
278 * possible micro-optimizations such as the unnecessary
279 * assignment for them.
280 */
281 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
282 }
283
284 static __inline void
285 outsb(u_int port, const void *addr, size_t cnt)
286 {
287 __asm __volatile("cld; rep; outsb"
288 : "+S" (addr), "+c" (cnt)
289 : "d" (port));
290 }
291
292 static __inline void
293 outsw(u_int port, const void *addr, size_t cnt)
294 {
295 __asm __volatile("cld; rep; outsw"
296 : "+S" (addr), "+c" (cnt)
297 : "d" (port));
298 }
299
300 static __inline void
301 outsl(u_int port, const void *addr, size_t cnt)
302 {
303 __asm __volatile("cld; rep; outsl"
304 : "+S" (addr), "+c" (cnt)
305 : "d" (port));
306 }
307
308 static __inline void
309 outw(u_int port, u_short data)
310 {
311 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
312 }
313
314 static __inline void
315 ia32_pause(void)
316 {
317 __asm __volatile("pause");
318 }
319
320 static __inline u_int
321 read_eflags(void)
322 {
323 u_int ef;
324
325 __asm __volatile("pushfl; popl %0" : "=r" (ef));
326 return (ef);
327 }
328
329 static __inline uint64_t
330 rdmsr(u_int msr)
331 {
332 uint64_t rv;
333
334 __asm __volatile("rdmsr" : "=A" (rv) : "c" (msr));
335 return (rv);
336 }
337
338 static __inline uint64_t
339 rdpmc(u_int pmc)
340 {
341 uint64_t rv;
342
343 __asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc));
344 return (rv);
345 }
346
347 static __inline uint64_t
348 rdtsc(void)
349 {
350 uint64_t rv;
351
352 __asm __volatile("rdtsc" : "=A" (rv));
353 return (rv);
354 }
355
356 static __inline void
357 wbinvd(void)
358 {
359 __asm __volatile("wbinvd");
360 }
361
362 static __inline void
363 write_eflags(u_int ef)
364 {
365 __asm __volatile("pushl %0; popfl" : : "r" (ef));
366 }
367
368 static __inline void
369 wrmsr(u_int msr, uint64_t newval)
370 {
371 __asm __volatile("wrmsr" : : "A" (newval), "c" (msr));
372 }
373
374 static __inline void
375 load_cr0(u_int data)
376 {
377
378 __asm __volatile("movl %0,%%cr0" : : "r" (data));
379 }
380
381 static __inline u_int
382 rcr0(void)
383 {
384 u_int data;
385
386 __asm __volatile("movl %%cr0,%0" : "=r" (data));
387 return (data);
388 }
389
390 static __inline u_int
391 rcr2(void)
392 {
393 u_int data;
394
395 __asm __volatile("movl %%cr2,%0" : "=r" (data));
396 return (data);
397 }
398
399 static __inline void
400 load_cr3(u_int data)
401 {
402
403 __asm __volatile("movl %0,%%cr3" : : "r" (data) : "memory");
404 }
405
406 static __inline u_int
407 rcr3(void)
408 {
409 u_int data;
410
411 __asm __volatile("movl %%cr3,%0" : "=r" (data));
412 return (data);
413 }
414
415 static __inline void
416 load_cr4(u_int data)
417 {
418 __asm __volatile("movl %0,%%cr4" : : "r" (data));
419 }
420
421 static __inline u_int
422 rcr4(void)
423 {
424 u_int data;
425
426 __asm __volatile("movl %%cr4,%0" : "=r" (data));
427 return (data);
428 }
429
430 /*
431 * Global TLB flush (except for thise for pages marked PG_G)
432 */
433 static __inline void
434 invltlb(void)
435 {
436
437 load_cr3(rcr3());
438 }
439
440 /*
441 * TLB flush for an individual page (even if it has PG_G).
442 * Only works on 486+ CPUs (i386 does not have PG_G).
443 */
444 static __inline void
445 invlpg(u_int addr)
446 {
447
448 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
449 }
450
451 static __inline u_int
452 rfs(void)
453 {
454 u_int sel;
455 __asm __volatile("movl %%fs,%0" : "=rm" (sel));
456 return (sel);
457 }
458
459 static __inline uint64_t
460 rgdt(void)
461 {
462 uint64_t gdtr;
463 __asm __volatile("sgdt %0" : "=m" (gdtr));
464 return (gdtr);
465 }
466
467 static __inline u_int
468 rgs(void)
469 {
470 u_int sel;
471 __asm __volatile("movl %%gs,%0" : "=rm" (sel));
472 return (sel);
473 }
474
475 static __inline uint64_t
476 ridt(void)
477 {
478 uint64_t idtr;
479 __asm __volatile("sidt %0" : "=m" (idtr));
480 return (idtr);
481 }
482
483 static __inline u_short
484 rldt(void)
485 {
486 u_short ldtr;
487 __asm __volatile("sldt %0" : "=g" (ldtr));
488 return (ldtr);
489 }
490
491 static __inline u_int
492 rss(void)
493 {
494 u_int sel;
495 __asm __volatile("movl %%ss,%0" : "=rm" (sel));
496 return (sel);
497 }
498
499 static __inline u_short
500 rtr(void)
501 {
502 u_short tr;
503 __asm __volatile("str %0" : "=g" (tr));
504 return (tr);
505 }
506
507 static __inline void
508 load_fs(u_int sel)
509 {
510 __asm __volatile("movl %0,%%fs" : : "rm" (sel));
511 }
512
513 static __inline void
514 load_gs(u_int sel)
515 {
516 __asm __volatile("movl %0,%%gs" : : "rm" (sel));
517 }
518
519 static __inline void
520 lidt(struct region_descriptor *addr)
521 {
522 __asm __volatile("lidt (%0)" : : "r" (addr));
523 }
524
525 static __inline void
526 lldt(u_short sel)
527 {
528 __asm __volatile("lldt %0" : : "r" (sel));
529 }
530
531 static __inline void
532 ltr(u_short sel)
533 {
534 __asm __volatile("ltr %0" : : "r" (sel));
535 }
536
537 static __inline u_int
538 rdr0(void)
539 {
540 u_int data;
541 __asm __volatile("movl %%dr0,%0" : "=r" (data));
542 return (data);
543 }
544
545 static __inline void
546 load_dr0(u_int dr0)
547 {
548 __asm __volatile("movl %0,%%dr0" : : "r" (dr0));
549 }
550
551 static __inline u_int
552 rdr1(void)
553 {
554 u_int data;
555 __asm __volatile("movl %%dr1,%0" : "=r" (data));
556 return (data);
557 }
558
559 static __inline void
560 load_dr1(u_int dr1)
561 {
562 __asm __volatile("movl %0,%%dr1" : : "r" (dr1));
563 }
564
565 static __inline u_int
566 rdr2(void)
567 {
568 u_int data;
569 __asm __volatile("movl %%dr2,%0" : "=r" (data));
570 return (data);
571 }
572
573 static __inline void
574 load_dr2(u_int dr2)
575 {
576 __asm __volatile("movl %0,%%dr2" : : "r" (dr2));
577 }
578
579 static __inline u_int
580 rdr3(void)
581 {
582 u_int data;
583 __asm __volatile("movl %%dr3,%0" : "=r" (data));
584 return (data);
585 }
586
587 static __inline void
588 load_dr3(u_int dr3)
589 {
590 __asm __volatile("movl %0,%%dr3" : : "r" (dr3));
591 }
592
593 static __inline u_int
594 rdr4(void)
595 {
596 u_int data;
597 __asm __volatile("movl %%dr4,%0" : "=r" (data));
598 return (data);
599 }
600
601 static __inline void
602 load_dr4(u_int dr4)
603 {
604 __asm __volatile("movl %0,%%dr4" : : "r" (dr4));
605 }
606
607 static __inline u_int
608 rdr5(void)
609 {
610 u_int data;
611 __asm __volatile("movl %%dr5,%0" : "=r" (data));
612 return (data);
613 }
614
615 static __inline void
616 load_dr5(u_int dr5)
617 {
618 __asm __volatile("movl %0,%%dr5" : : "r" (dr5));
619 }
620
621 static __inline u_int
622 rdr6(void)
623 {
624 u_int data;
625 __asm __volatile("movl %%dr6,%0" : "=r" (data));
626 return (data);
627 }
628
629 static __inline void
630 load_dr6(u_int dr6)
631 {
632 __asm __volatile("movl %0,%%dr6" : : "r" (dr6));
633 }
634
635 static __inline u_int
636 rdr7(void)
637 {
638 u_int data;
639 __asm __volatile("movl %%dr7,%0" : "=r" (data));
640 return (data);
641 }
642
643 static __inline void
644 load_dr7(u_int dr7)
645 {
646 __asm __volatile("movl %0,%%dr7" : : "r" (dr7));
647 }
648
649 static __inline register_t
650 intr_disable(void)
651 {
652 register_t eflags;
653
654 eflags = read_eflags();
655 disable_intr();
656 return (eflags);
657 }
658
659 static __inline void
660 intr_restore(register_t eflags)
661 {
662 write_eflags(eflags);
663 }
664
665 #else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */
666
667 int breakpoint(void);
668 u_int bsfl(u_int mask);
669 u_int bsrl(u_int mask);
670 void disable_intr(void);
671 void do_cpuid(u_int ax, u_int *p);
672 void enable_intr(void);
673 void halt(void);
674 void ia32_pause(void);
675 u_char inb(u_int port);
676 u_int inl(u_int port);
677 void insb(u_int port, void *addr, size_t cnt);
678 void insl(u_int port, void *addr, size_t cnt);
679 void insw(u_int port, void *addr, size_t cnt);
680 register_t intr_disable(void);
681 void intr_restore(register_t ef);
682 void invd(void);
683 void invlpg(u_int addr);
684 void invltlb(void);
685 u_short inw(u_int port);
686 void lidt(struct region_descriptor *addr);
687 void lldt(u_short sel);
688 void load_cr0(u_int cr0);
689 void load_cr3(u_int cr3);
690 void load_cr4(u_int cr4);
691 void load_dr0(u_int dr0);
692 void load_dr1(u_int dr1);
693 void load_dr2(u_int dr2);
694 void load_dr3(u_int dr3);
695 void load_dr4(u_int dr4);
696 void load_dr5(u_int dr5);
697 void load_dr6(u_int dr6);
698 void load_dr7(u_int dr7);
699 void load_fs(u_int sel);
700 void load_gs(u_int sel);
701 void ltr(u_short sel);
702 void outb(u_int port, u_char data);
703 void outl(u_int port, u_int data);
704 void outsb(u_int port, const void *addr, size_t cnt);
705 void outsl(u_int port, const void *addr, size_t cnt);
706 void outsw(u_int port, const void *addr, size_t cnt);
707 void outw(u_int port, u_short data);
708 u_int rcr0(void);
709 u_int rcr2(void);
710 u_int rcr3(void);
711 u_int rcr4(void);
712 uint64_t rdmsr(u_int msr);
713 uint64_t rdpmc(u_int pmc);
714 u_int rdr0(void);
715 u_int rdr1(void);
716 u_int rdr2(void);
717 u_int rdr3(void);
718 u_int rdr4(void);
719 u_int rdr5(void);
720 u_int rdr6(void);
721 u_int rdr7(void);
722 uint64_t rdtsc(void);
723 u_int read_eflags(void);
724 u_int rfs(void);
725 uint64_t rgdt(void);
726 u_int rgs(void);
727 uint64_t ridt(void);
728 u_short rldt(void);
729 u_short rtr(void);
730 void wbinvd(void);
731 void write_eflags(u_int ef);
732 void wrmsr(u_int msr, uint64_t newval);
733
734 #endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */
735
736 void reset_dbregs(void);
737
738 #endif /* !_MACHINE_CPUFUNC_H_ */
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