1 /*-
2 * Copyright (c) 2003 Peter Wemm.
3 * Copyright (c) 1993 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33 /*
34 * Functions to provide access to special i386 instructions.
35 * This in included in sys/systm.h, and that file should be
36 * used in preference to this.
37 */
38
39 #ifndef _MACHINE_CPUFUNC_H_
40 #define _MACHINE_CPUFUNC_H_
41
42 #ifndef _SYS_CDEFS_H_
43 #error this file needs sys/cdefs.h as a prerequisite
44 #endif
45
46 struct region_descriptor;
47
48 #define readb(va) (*(volatile u_int8_t *) (va))
49 #define readw(va) (*(volatile u_int16_t *) (va))
50 #define readl(va) (*(volatile u_int32_t *) (va))
51 #define readq(va) (*(volatile u_int64_t *) (va))
52
53 #define writeb(va, d) (*(volatile u_int8_t *) (va) = (d))
54 #define writew(va, d) (*(volatile u_int16_t *) (va) = (d))
55 #define writel(va, d) (*(volatile u_int32_t *) (va) = (d))
56 #define writeq(va, d) (*(volatile u_int64_t *) (va) = (d))
57
58 #if defined(__GNUCLIKE_ASM) && defined(__CC_SUPPORTS___INLINE)
59
60 static __inline void
61 breakpoint(void)
62 {
63 __asm __volatile("int $3");
64 }
65
66 static __inline u_int
67 bsfl(u_int mask)
68 {
69 u_int result;
70
71 __asm __volatile("bsfl %1,%0" : "=r" (result) : "rm" (mask));
72 return (result);
73 }
74
75 static __inline u_long
76 bsfq(u_long mask)
77 {
78 u_long result;
79
80 __asm __volatile("bsfq %1,%0" : "=r" (result) : "rm" (mask));
81 return (result);
82 }
83
84 static __inline u_int
85 bsrl(u_int mask)
86 {
87 u_int result;
88
89 __asm __volatile("bsrl %1,%0" : "=r" (result) : "rm" (mask));
90 return (result);
91 }
92
93 static __inline u_long
94 bsrq(u_long mask)
95 {
96 u_long result;
97
98 __asm __volatile("bsrq %1,%0" : "=r" (result) : "rm" (mask));
99 return (result);
100 }
101
102 static __inline void
103 disable_intr(void)
104 {
105 __asm __volatile("cli" : : : "memory");
106 }
107
108 static __inline void
109 do_cpuid(u_int ax, u_int *p)
110 {
111 __asm __volatile("cpuid"
112 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
113 : "" (ax));
114 }
115
116 static __inline void
117 cpuid_count(u_int ax, u_int cx, u_int *p)
118 {
119 __asm __volatile("cpuid"
120 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
121 : "" (ax), "c" (cx));
122 }
123
124 static __inline void
125 enable_intr(void)
126 {
127 __asm __volatile("sti");
128 }
129
130 #ifdef _KERNEL
131
132 #define HAVE_INLINE_FFS
133 #define ffs(x) __builtin_ffs(x)
134
135 #define HAVE_INLINE_FFSL
136
137 static __inline int
138 ffsl(long mask)
139 {
140 return (mask == 0 ? mask : (int)bsfq((u_long)mask) + 1);
141 }
142
143 #define HAVE_INLINE_FLS
144
145 static __inline int
146 fls(int mask)
147 {
148 return (mask == 0 ? mask : (int)bsrl((u_int)mask) + 1);
149 }
150
151 #define HAVE_INLINE_FLSL
152
153 static __inline int
154 flsl(long mask)
155 {
156 return (mask == 0 ? mask : (int)bsrq((u_long)mask) + 1);
157 }
158
159 #endif /* _KERNEL */
160
161 static __inline void
162 halt(void)
163 {
164 __asm __volatile("hlt");
165 }
166
167 #if !defined(__GNUCLIKE_BUILTIN_CONSTANT_P) || __GNUCLIKE_ASM < 3
168
169 #define inb(port) inbv(port)
170 #define outb(port, data) outbv(port, data)
171
172 #else /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3 */
173
174 /*
175 * The following complications are to get around gcc not having a
176 * constraint letter for the range 0..255. We still put "d" in the
177 * constraint because "i" isn't a valid constraint when the port
178 * isn't constant. This only matters for -O0 because otherwise
179 * the non-working version gets optimized away.
180 *
181 * Use an expression-statement instead of a conditional expression
182 * because gcc-2.6.0 would promote the operands of the conditional
183 * and produce poor code for "if ((inb(var) & const1) == const2)".
184 *
185 * The unnecessary test `(port) < 0x10000' is to generate a warning if
186 * the `port' has type u_short or smaller. Such types are pessimal.
187 * This actually only works for signed types. The range check is
188 * careful to avoid generating warnings.
189 */
190 #define inb(port) __extension__ ({ \
191 u_char _data; \
192 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
193 && (port) < 0x10000) \
194 _data = inbc(port); \
195 else \
196 _data = inbv(port); \
197 _data; })
198
199 #define outb(port, data) ( \
200 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
201 && (port) < 0x10000 \
202 ? outbc(port, data) : outbv(port, data))
203
204 static __inline u_char
205 inbc(u_int port)
206 {
207 u_char data;
208
209 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
210 return (data);
211 }
212
213 static __inline void
214 outbc(u_int port, u_char data)
215 {
216 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
217 }
218
219 #endif /* __GNUCLIKE_BUILTIN_CONSTANT_P && __GNUCLIKE_ASM >= 3*/
220
221 static __inline u_char
222 inbv(u_int port)
223 {
224 u_char data;
225 /*
226 * We use %%dx and not %1 here because i/o is done at %dx and not at
227 * %edx, while gcc generates inferior code (movw instead of movl)
228 * if we tell it to load (u_short) port.
229 */
230 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
231 return (data);
232 }
233
234 static __inline u_int
235 inl(u_int port)
236 {
237 u_int data;
238
239 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
240 return (data);
241 }
242
243 static __inline void
244 insb(u_int port, void *addr, size_t cnt)
245 {
246 __asm __volatile("cld; rep; insb"
247 : "+D" (addr), "+c" (cnt)
248 : "d" (port)
249 : "memory");
250 }
251
252 static __inline void
253 insw(u_int port, void *addr, size_t cnt)
254 {
255 __asm __volatile("cld; rep; insw"
256 : "+D" (addr), "+c" (cnt)
257 : "d" (port)
258 : "memory");
259 }
260
261 static __inline void
262 insl(u_int port, void *addr, size_t cnt)
263 {
264 __asm __volatile("cld; rep; insl"
265 : "+D" (addr), "+c" (cnt)
266 : "d" (port)
267 : "memory");
268 }
269
270 static __inline void
271 invd(void)
272 {
273 __asm __volatile("invd");
274 }
275
276 static __inline u_short
277 inw(u_int port)
278 {
279 u_short data;
280
281 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
282 return (data);
283 }
284
285 static __inline void
286 outbv(u_int port, u_char data)
287 {
288 u_char al;
289 /*
290 * Use an unnecessary assignment to help gcc's register allocator.
291 * This make a large difference for gcc-1.40 and a tiny difference
292 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
293 * best results. gcc-2.6.0 can't handle this.
294 */
295 al = data;
296 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
297 }
298
299 static __inline void
300 outl(u_int port, u_int data)
301 {
302 /*
303 * outl() and outw() aren't used much so we haven't looked at
304 * possible micro-optimizations such as the unnecessary
305 * assignment for them.
306 */
307 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
308 }
309
310 static __inline void
311 outsb(u_int port, const void *addr, size_t cnt)
312 {
313 __asm __volatile("cld; rep; outsb"
314 : "+S" (addr), "+c" (cnt)
315 : "d" (port));
316 }
317
318 static __inline void
319 outsw(u_int port, const void *addr, size_t cnt)
320 {
321 __asm __volatile("cld; rep; outsw"
322 : "+S" (addr), "+c" (cnt)
323 : "d" (port));
324 }
325
326 static __inline void
327 outsl(u_int port, const void *addr, size_t cnt)
328 {
329 __asm __volatile("cld; rep; outsl"
330 : "+S" (addr), "+c" (cnt)
331 : "d" (port));
332 }
333
334 static __inline void
335 outw(u_int port, u_short data)
336 {
337 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
338 }
339
340 static __inline void
341 ia32_pause(void)
342 {
343 __asm __volatile("pause");
344 }
345
346 static __inline u_long
347 read_rflags(void)
348 {
349 u_long rf;
350
351 __asm __volatile("pushfq; popq %0" : "=r" (rf));
352 return (rf);
353 }
354
355 static __inline u_int64_t
356 rdmsr(u_int msr)
357 {
358 u_int32_t low, high;
359
360 __asm __volatile("rdmsr" : "=a" (low), "=d" (high) : "c" (msr));
361 return (low | ((u_int64_t)high << 32));
362 }
363
364 static __inline u_int64_t
365 rdpmc(u_int pmc)
366 {
367 u_int32_t low, high;
368
369 __asm __volatile("rdpmc" : "=a" (low), "=d" (high) : "c" (pmc));
370 return (low | ((u_int64_t)high << 32));
371 }
372
373 static __inline u_int64_t
374 rdtsc(void)
375 {
376 u_int32_t low, high;
377
378 __asm __volatile("rdtsc" : "=a" (low), "=d" (high));
379 return (low | ((u_int64_t)high << 32));
380 }
381
382 static __inline void
383 wbinvd(void)
384 {
385 __asm __volatile("wbinvd");
386 }
387
388 static __inline void
389 write_rflags(u_long rf)
390 {
391 __asm __volatile("pushq %0; popfq" : : "r" (rf));
392 }
393
394 static __inline void
395 wrmsr(u_int msr, u_int64_t newval)
396 {
397 u_int32_t low, high;
398
399 low = newval;
400 high = newval >> 32;
401 __asm __volatile("wrmsr" : : "a" (low), "d" (high), "c" (msr));
402 }
403
404 static __inline void
405 load_cr0(u_long data)
406 {
407
408 __asm __volatile("movq %0,%%cr0" : : "r" (data));
409 }
410
411 static __inline u_long
412 rcr0(void)
413 {
414 u_long data;
415
416 __asm __volatile("movq %%cr0,%0" : "=r" (data));
417 return (data);
418 }
419
420 static __inline u_long
421 rcr2(void)
422 {
423 u_long data;
424
425 __asm __volatile("movq %%cr2,%0" : "=r" (data));
426 return (data);
427 }
428
429 static __inline void
430 load_cr3(u_long data)
431 {
432
433 __asm __volatile("movq %0,%%cr3" : : "r" (data) : "memory");
434 }
435
436 static __inline u_long
437 rcr3(void)
438 {
439 u_long data;
440
441 __asm __volatile("movq %%cr3,%0" : "=r" (data));
442 return (data);
443 }
444
445 static __inline void
446 load_cr4(u_long data)
447 {
448 __asm __volatile("movq %0,%%cr4" : : "r" (data));
449 }
450
451 static __inline u_long
452 rcr4(void)
453 {
454 u_long data;
455
456 __asm __volatile("movq %%cr4,%0" : "=r" (data));
457 return (data);
458 }
459
460 /*
461 * Global TLB flush (except for thise for pages marked PG_G)
462 */
463 static __inline void
464 invltlb(void)
465 {
466
467 load_cr3(rcr3());
468 }
469
470 /*
471 * TLB flush for an individual page (even if it has PG_G).
472 * Only works on 486+ CPUs (i386 does not have PG_G).
473 */
474 static __inline void
475 invlpg(u_long addr)
476 {
477
478 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
479 }
480
481 static __inline u_int
482 rfs(void)
483 {
484 u_int sel;
485 __asm __volatile("movl %%fs,%0" : "=rm" (sel));
486 return (sel);
487 }
488
489 static __inline u_int
490 rgs(void)
491 {
492 u_int sel;
493 __asm __volatile("movl %%gs,%0" : "=rm" (sel));
494 return (sel);
495 }
496
497 static __inline u_int
498 rss(void)
499 {
500 u_int sel;
501 __asm __volatile("movl %%ss,%0" : "=rm" (sel));
502 return (sel);
503 }
504
505 static __inline void
506 load_ds(u_int sel)
507 {
508 __asm __volatile("movl %0,%%ds" : : "rm" (sel));
509 }
510
511 static __inline void
512 load_es(u_int sel)
513 {
514 __asm __volatile("movl %0,%%es" : : "rm" (sel));
515 }
516
517 #ifdef _KERNEL
518 /* This is defined in <machine/specialreg.h> but is too painful to get to */
519 #ifndef MSR_FSBASE
520 #define MSR_FSBASE 0xc0000100
521 #endif
522 static __inline void
523 load_fs(u_int sel)
524 {
525 register u_int32_t fsbase __asm("ecx");
526
527 /* Preserve the fsbase value across the selector load */
528 fsbase = MSR_FSBASE;
529 __asm __volatile("rdmsr; movl %0,%%fs; wrmsr"
530 : : "rm" (sel), "c" (fsbase) : "eax", "edx");
531 }
532
533 #ifndef MSR_GSBASE
534 #define MSR_GSBASE 0xc0000101
535 #endif
536 static __inline void
537 load_gs(u_int sel)
538 {
539 register u_int32_t gsbase __asm("ecx");
540
541 /*
542 * Preserve the gsbase value across the selector load.
543 * Note that we have to disable interrupts because the gsbase
544 * being trashed happens to be the kernel gsbase at the time.
545 */
546 gsbase = MSR_GSBASE;
547 __asm __volatile("pushfq; cli; rdmsr; movl %0,%%gs; wrmsr; popfq"
548 : : "rm" (sel), "c" (gsbase) : "eax", "edx");
549 }
550 #else
551 /* Usable by userland */
552 static __inline void
553 load_fs(u_int sel)
554 {
555 __asm __volatile("movl %0,%%fs" : : "rm" (sel));
556 }
557
558 static __inline void
559 load_gs(u_int sel)
560 {
561 __asm __volatile("movl %0,%%gs" : : "rm" (sel));
562 }
563 #endif
564
565 static __inline void
566 lidt(struct region_descriptor *addr)
567 {
568 __asm __volatile("lidt (%0)" : : "r" (addr));
569 }
570
571 static __inline void
572 lldt(u_short sel)
573 {
574 __asm __volatile("lldt %0" : : "r" (sel));
575 }
576
577 static __inline void
578 ltr(u_short sel)
579 {
580 __asm __volatile("ltr %0" : : "r" (sel));
581 }
582
583 static __inline u_int64_t
584 rdr0(void)
585 {
586 u_int64_t data;
587 __asm __volatile("movq %%dr0,%0" : "=r" (data));
588 return (data);
589 }
590
591 static __inline void
592 load_dr0(u_int64_t dr0)
593 {
594 __asm __volatile("movq %0,%%dr0" : : "r" (dr0));
595 }
596
597 static __inline u_int64_t
598 rdr1(void)
599 {
600 u_int64_t data;
601 __asm __volatile("movq %%dr1,%0" : "=r" (data));
602 return (data);
603 }
604
605 static __inline void
606 load_dr1(u_int64_t dr1)
607 {
608 __asm __volatile("movq %0,%%dr1" : : "r" (dr1));
609 }
610
611 static __inline u_int64_t
612 rdr2(void)
613 {
614 u_int64_t data;
615 __asm __volatile("movq %%dr2,%0" : "=r" (data));
616 return (data);
617 }
618
619 static __inline void
620 load_dr2(u_int64_t dr2)
621 {
622 __asm __volatile("movq %0,%%dr2" : : "r" (dr2));
623 }
624
625 static __inline u_int64_t
626 rdr3(void)
627 {
628 u_int64_t data;
629 __asm __volatile("movq %%dr3,%0" : "=r" (data));
630 return (data);
631 }
632
633 static __inline void
634 load_dr3(u_int64_t dr3)
635 {
636 __asm __volatile("movq %0,%%dr3" : : "r" (dr3));
637 }
638
639 static __inline u_int64_t
640 rdr4(void)
641 {
642 u_int64_t data;
643 __asm __volatile("movq %%dr4,%0" : "=r" (data));
644 return (data);
645 }
646
647 static __inline void
648 load_dr4(u_int64_t dr4)
649 {
650 __asm __volatile("movq %0,%%dr4" : : "r" (dr4));
651 }
652
653 static __inline u_int64_t
654 rdr5(void)
655 {
656 u_int64_t data;
657 __asm __volatile("movq %%dr5,%0" : "=r" (data));
658 return (data);
659 }
660
661 static __inline void
662 load_dr5(u_int64_t dr5)
663 {
664 __asm __volatile("movq %0,%%dr5" : : "r" (dr5));
665 }
666
667 static __inline u_int64_t
668 rdr6(void)
669 {
670 u_int64_t data;
671 __asm __volatile("movq %%dr6,%0" : "=r" (data));
672 return (data);
673 }
674
675 static __inline void
676 load_dr6(u_int64_t dr6)
677 {
678 __asm __volatile("movq %0,%%dr6" : : "r" (dr6));
679 }
680
681 static __inline u_int64_t
682 rdr7(void)
683 {
684 u_int64_t data;
685 __asm __volatile("movq %%dr7,%0" : "=r" (data));
686 return (data);
687 }
688
689 static __inline void
690 load_dr7(u_int64_t dr7)
691 {
692 __asm __volatile("movq %0,%%dr7" : : "r" (dr7));
693 }
694
695 static __inline register_t
696 intr_disable(void)
697 {
698 register_t rflags;
699
700 rflags = read_rflags();
701 disable_intr();
702 return (rflags);
703 }
704
705 static __inline void
706 intr_restore(register_t rflags)
707 {
708 write_rflags(rflags);
709 }
710
711 #else /* !(__GNUCLIKE_ASM && __CC_SUPPORTS___INLINE) */
712
713 int breakpoint(void);
714 u_int bsfl(u_int mask);
715 u_int bsrl(u_int mask);
716 void disable_intr(void);
717 void do_cpuid(u_int ax, u_int *p);
718 void enable_intr(void);
719 void halt(void);
720 void ia32_pause(void);
721 u_char inb(u_int port);
722 u_int inl(u_int port);
723 void insb(u_int port, void *addr, size_t cnt);
724 void insl(u_int port, void *addr, size_t cnt);
725 void insw(u_int port, void *addr, size_t cnt);
726 register_t intr_disable(void);
727 void intr_restore(register_t rf);
728 void invd(void);
729 void invlpg(u_int addr);
730 void invltlb(void);
731 u_short inw(u_int port);
732 void lidt(struct region_descriptor *addr);
733 void lldt(u_short sel);
734 void load_cr0(u_long cr0);
735 void load_cr3(u_long cr3);
736 void load_cr4(u_long cr4);
737 void load_dr0(u_int64_t dr0);
738 void load_dr1(u_int64_t dr1);
739 void load_dr2(u_int64_t dr2);
740 void load_dr3(u_int64_t dr3);
741 void load_dr4(u_int64_t dr4);
742 void load_dr5(u_int64_t dr5);
743 void load_dr6(u_int64_t dr6);
744 void load_dr7(u_int64_t dr7);
745 void load_fs(u_int sel);
746 void load_gs(u_int sel);
747 void ltr(u_short sel);
748 void outb(u_int port, u_char data);
749 void outl(u_int port, u_int data);
750 void outsb(u_int port, const void *addr, size_t cnt);
751 void outsl(u_int port, const void *addr, size_t cnt);
752 void outsw(u_int port, const void *addr, size_t cnt);
753 void outw(u_int port, u_short data);
754 u_long rcr0(void);
755 u_long rcr2(void);
756 u_long rcr3(void);
757 u_long rcr4(void);
758 u_int64_t rdmsr(u_int msr);
759 u_int64_t rdpmc(u_int pmc);
760 u_int64_t rdr0(void);
761 u_int64_t rdr1(void);
762 u_int64_t rdr2(void);
763 u_int64_t rdr3(void);
764 u_int64_t rdr4(void);
765 u_int64_t rdr5(void);
766 u_int64_t rdr6(void);
767 u_int64_t rdr7(void);
768 u_int64_t rdtsc(void);
769 u_int read_rflags(void);
770 u_int rfs(void);
771 u_int rgs(void);
772 void wbinvd(void);
773 void write_rflags(u_int rf);
774 void wrmsr(u_int msr, u_int64_t newval);
775
776 #endif /* __GNUCLIKE_ASM && __CC_SUPPORTS___INLINE */
777
778 void reset_dbregs(void);
779
780 #endif /* !_MACHINE_CPUFUNC_H_ */
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