2 * Copyright (c) 1993 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
37 * Functions to provide access to special i386 instructions.
40 #ifndef _MACHINE_CPUFUNC_H_
41 #define _MACHINE_CPUFUNC_H_
43 #include <sys/cdefs.h>
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))
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))
56 #ifdef SWTCH_OPTIM_STATS
57 extern int tlb_flush_count; /* XXX */
63 __asm __volatile("int $3");
71 __asm __volatile("bsfl %0,%0" : "=r" (result) : "0" (mask));
80 __asm __volatile("bsrl %0,%0" : "=r" (result) : "0" (mask));
87 __asm __volatile("cli" : : : "memory");
93 __asm __volatile("sti");
96 #define HAVE_INLINE_FFS
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
107 return (mask == 0 ? mask : bsfl((u_int)mask) + 1);
110 #define HAVE_INLINE_FLS
115 return (mask == 0 ? mask : bsrl((u_int)mask) + 1);
120 #define inb(port) inbv(port)
121 #define outb(port, data) outbv(port, data)
123 #else /* __GNUC >= 2 */
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.
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)".
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.
141 #define inb(port) __extension__ ({ \
143 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
144 && (port) < 0x10000) \
145 _data = inbc(port); \
147 _data = inbv(port); \
150 #define outb(port, data) ( \
151 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
152 && (port) < 0x10000 \
153 ? outbc(port, data) : outbv(port, data))
155 static __inline u_char
160 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
165 outbc(u_int port, u_char data)
167 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
170 #endif /* __GNUC <= 2 */
172 static __inline u_char
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.
181 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
185 static __inline u_int
190 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
195 insb(u_int port, void *addr, size_t cnt)
197 __asm __volatile("cld; rep; insb"
198 : "=D" (addr), "=c" (cnt)
199 : "0" (addr), "1" (cnt), "d" (port)
204 insw(u_int port, void *addr, size_t cnt)
206 __asm __volatile("cld; rep; insw"
207 : "=D" (addr), "=c" (cnt)
208 : "0" (addr), "1" (cnt), "d" (port)
213 insl(u_int port, void *addr, size_t cnt)
215 __asm __volatile("cld; rep; insl"
216 : "=D" (addr), "=c" (cnt)
217 : "0" (addr), "1" (cnt), "d" (port)
224 __asm __volatile("invd");
227 #if defined(SMP) && defined(_KERNEL)
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.
234 void invlpg __P((u_int addr));
235 void invltlb __P((void));
238 cpu_invlpg(void *addr)
240 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
248 * This should be implemented as load_cr3(rcr3()) when load_cr3()
251 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp)
253 #if defined(SWTCH_OPTIM_STATS)
258 #else /* !(SMP && _KERNEL) */
263 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
271 * This should be implemented as load_cr3(rcr3()) when load_cr3()
274 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp)
276 #ifdef SWTCH_OPTIM_STATS
281 #endif /* SMP && _KERNEL */
283 static __inline u_short
288 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
293 outbv(u_int port, u_char data)
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.
303 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
307 outl(u_int port, u_int data)
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.
314 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
318 outsb(u_int port, const void *addr, size_t cnt)
320 __asm __volatile("cld; rep; outsb"
321 : "=S" (addr), "=c" (cnt)
322 : "0" (addr), "1" (cnt), "d" (port));
326 outsw(u_int port, const void *addr, size_t cnt)
328 __asm __volatile("cld; rep; outsw"
329 : "=S" (addr), "=c" (cnt)
330 : "0" (addr), "1" (cnt), "d" (port));
334 outsl(u_int port, const void *addr, size_t cnt)
336 __asm __volatile("cld; rep; outsl"
337 : "=S" (addr), "=c" (cnt)
338 : "0" (addr), "1" (cnt), "d" (port));
342 outw(u_int port, u_short data)
344 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
347 static __inline u_int
352 __asm __volatile("movl %%cr2,%0" : "=r" (data));
356 static __inline u_int
361 __asm __volatile("pushfl; popl %0" : "=r" (ef));
365 static __inline u_int64_t
370 __asm __volatile("rdmsr" : "=A" (rv) : "c" (msr));
374 static __inline u_int64_t
379 __asm __volatile("rdpmc" : "=A" (rv) : "c" (pmc));
383 static __inline u_int64_t
388 __asm __volatile("rdtsc" : "=A" (rv));
395 __asm __volatile("wbinvd");
399 write_eflags(u_int ef)
401 __asm __volatile("pushl %0; popfl" : : "r" (ef));
405 wrmsr(u_int msr, u_int64_t newval)
407 __asm __volatile("wrmsr" : : "A" (newval), "c" (msr));
410 static __inline u_int
414 __asm __volatile("movl %%fs,%0" : "=rm" (sel));
418 static __inline u_int
422 __asm __volatile("movl %%gs,%0" : "=rm" (sel));
429 __asm __volatile("movl %0,%%fs" : : "rm" (sel));
435 __asm __volatile("movl %0,%%gs" : : "rm" (sel));
438 static __inline u_int
442 __asm __volatile("movl %%dr0,%0" : "=r" (data));
449 __asm __volatile("movl %0,%%dr0" : : "r" (sel));
452 static __inline u_int
456 __asm __volatile("movl %%dr1,%0" : "=r" (data));
463 __asm __volatile("movl %0,%%dr1" : : "r" (sel));
466 static __inline u_int
470 __asm __volatile("movl %%dr2,%0" : "=r" (data));
477 __asm __volatile("movl %0,%%dr2" : : "r" (sel));
480 static __inline u_int
484 __asm __volatile("movl %%dr3,%0" : "=r" (data));
491 __asm __volatile("movl %0,%%dr3" : : "r" (sel));
494 static __inline u_int
498 __asm __volatile("movl %%dr4,%0" : "=r" (data));
505 __asm __volatile("movl %0,%%dr4" : : "r" (sel));
508 static __inline u_int
512 __asm __volatile("movl %%dr5,%0" : "=r" (data));
519 __asm __volatile("movl %0,%%dr5" : : "r" (sel));
522 static __inline u_int
526 __asm __volatile("movl %%dr6,%0" : "=r" (data));
533 __asm __volatile("movl %0,%%dr6" : : "r" (sel));
536 static __inline u_int
540 __asm __volatile("movl %%dr7,%0" : "=r" (data));
547 __asm __volatile("movl %0,%%dr7" : : "r" (sel));
550 static __inline critical_t
555 eflags = read_eflags();
561 critical_exit(critical_t eflags)
563 write_eflags(eflags);
566 #else /* !__GNUC__ */
568 int breakpoint __P((void));
569 u_int bsfl __P((u_int mask));
570 u_int bsrl __P((u_int mask));
571 void disable_intr __P((void));
572 void enable_intr __P((void));
573 u_char inb __P((u_int port));
574 u_int inl __P((u_int port));
575 void insb __P((u_int port, void *addr, size_t cnt));
576 void insl __P((u_int port, void *addr, size_t cnt));
577 void insw __P((u_int port, void *addr, size_t cnt));
578 void invd __P((void));
579 void invlpg __P((u_int addr));
580 void invltlb __P((void));
581 u_short inw __P((u_int port));
582 void outb __P((u_int port, u_char data));
583 void outl __P((u_int port, u_int data));
584 void outsb __P((u_int port, void *addr, size_t cnt));
585 void outsl __P((u_int port, void *addr, size_t cnt));
586 void outsw __P((u_int port, void *addr, size_t cnt));
587 void outw __P((u_int port, u_short data));
588 u_int rcr2 __P((void));
589 u_int64_t rdmsr __P((u_int msr));
590 u_int64_t rdpmc __P((u_int pmc));
591 u_int64_t rdtsc __P((void));
592 u_int read_eflags __P((void));
593 void wbinvd __P((void));
594 void write_eflags __P((u_int ef));
595 void wrmsr __P((u_int msr, u_int64_t newval));
596 u_int rfs __P((void));
597 u_int rgs __P((void));
598 void load_fs __P((u_int sel));
599 void load_gs __P((u_int sel));
600 critical_t critical_enter __P((void));
601 void critical_exit __P((critical_t eflags));
603 #endif /* __GNUC__ */
605 void load_cr0 __P((u_int cr0));
606 void load_cr3 __P((u_int cr3));
607 void load_cr4 __P((u_int cr4));
608 void ltr __P((u_short sel));
609 u_int rcr0 __P((void));
610 u_int rcr3 __P((void));
611 u_int rcr4 __P((void));
612 void reset_dbregs __P((void));
615 #endif /* !_MACHINE_CPUFUNC_H_ */