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
33 * $FreeBSD: src/sys/i386/include/cpufunc.h,v 1.96.2.3 2002/04/28 22:50:54 dwmalone Exp $
34 * $DragonFly: src/sys/cpu/i386/include/cpufunc.h,v 1.2 2003/06/17 04:28:35 dillon Exp $
38 * Functions to provide access to special i386 instructions.
41 #ifndef _MACHINE_CPUFUNC_H_
42 #define _MACHINE_CPUFUNC_H_
44 #include <sys/cdefs.h>
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))
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))
58 #include <machine/lock.h> /* XXX */
61 #ifdef SWTCH_OPTIM_STATS
62 extern int tlb_flush_count; /* XXX */
68 __asm __volatile("int $3");
76 __asm __volatile("bsfl %0,%0" : "=r" (result) : "0" (mask));
85 __asm __volatile("bsrl %0,%0" : "=r" (result) : "0" (mask));
92 __asm __volatile("cli" : : : "memory");
99 do_cpuid(u_int ax, u_int *p)
101 __asm __volatile("cpuid"
102 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
112 __asm __volatile("sti");
115 #define HAVE_INLINE_FFS
121 * Note that gcc-2's builtin ffs would be used if we didn't declare
122 * this inline or turn off the builtin. The builtin is faster but
123 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later
126 return (mask == 0 ? mask : bsfl((u_int)mask) + 1);
129 #define HAVE_INLINE_FLS
134 return (mask == 0 ? mask : bsrl((u_int)mask) + 1);
139 #define inb(port) inbv(port)
140 #define outb(port, data) outbv(port, data)
142 #else /* __GNUC >= 2 */
145 * The following complications are to get around gcc not having a
146 * constraint letter for the range 0..255. We still put "d" in the
147 * constraint because "i" isn't a valid constraint when the port
148 * isn't constant. This only matters for -O0 because otherwise
149 * the non-working version gets optimized away.
151 * Use an expression-statement instead of a conditional expression
152 * because gcc-2.6.0 would promote the operands of the conditional
153 * and produce poor code for "if ((inb(var) & const1) == const2)".
155 * The unnecessary test `(port) < 0x10000' is to generate a warning if
156 * the `port' has type u_short or smaller. Such types are pessimal.
157 * This actually only works for signed types. The range check is
158 * careful to avoid generating warnings.
160 #define inb(port) __extension__ ({ \
162 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
163 && (port) < 0x10000) \
164 _data = inbc(port); \
166 _data = inbv(port); \
169 #define outb(port, data) ( \
170 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
171 && (port) < 0x10000 \
172 ? outbc(port, data) : outbv(port, data))
174 static __inline u_char
179 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
184 outbc(u_int port, u_char data)
186 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
189 #endif /* __GNUC <= 2 */
191 static __inline u_char
196 * We use %%dx and not %1 here because i/o is done at %dx and not at
197 * %edx, while gcc generates inferior code (movw instead of movl)
198 * if we tell it to load (u_short) port.
200 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
204 static __inline u_int
209 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
214 insb(u_int port, void *addr, size_t cnt)
216 __asm __volatile("cld; rep; insb"
217 : "=D" (addr), "=c" (cnt)
218 : "0" (addr), "1" (cnt), "d" (port)
223 insw(u_int port, void *addr, size_t cnt)
225 __asm __volatile("cld; rep; insw"
226 : "=D" (addr), "=c" (cnt)
227 : "0" (addr), "1" (cnt), "d" (port)
232 insl(u_int port, void *addr, size_t cnt)
234 __asm __volatile("cld; rep; insl"
235 : "=D" (addr), "=c" (cnt)
236 : "0" (addr), "1" (cnt), "d" (port)
243 __asm __volatile("invd");
246 #if defined(SMP) && defined(_KERNEL)
249 * When using APIC IPI's, invlpg() is not simply the invlpg instruction
250 * (this is a bug) and the inlining cost is prohibitive since the call
251 * executes into the IPI transmission system.
253 void invlpg __P((u_int addr));
254 void invltlb __P((void));
257 cpu_invlpg(void *addr)
259 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
267 * This should be implemented as load_cr3(rcr3()) when load_cr3()
270 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp)
272 #if defined(SWTCH_OPTIM_STATS)
277 #else /* !(SMP && _KERNEL) */
282 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
290 * This should be implemented as load_cr3(rcr3()) when load_cr3()
293 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp)
295 #ifdef SWTCH_OPTIM_STATS
300 #endif /* SMP && _KERNEL */
302 static __inline u_short
307 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
311 static __inline u_int
312 loadandclear(volatile u_int *addr)
316 __asm __volatile("xorl %0,%0; xchgl %1,%0"
317 : "=&r" (result) : "m" (*addr));
322 outbv(u_int port, u_char data)
326 * Use an unnecessary assignment to help gcc's register allocator.
327 * This make a large difference for gcc-1.40 and a tiny difference
328 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
329 * best results. gcc-2.6.0 can't handle this.
332 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
336 outl(u_int port, u_int data)
339 * outl() and outw() aren't used much so we haven't looked at
340 * possible micro-optimizations such as the unnecessary
341 * assignment for them.
343 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
347 outsb(u_int port, const void *addr, size_t cnt)
349 __asm __volatile("cld; rep; outsb"
350 : "=S" (addr), "=c" (cnt)
351 : "0" (addr), "1" (cnt), "d" (port));
355 outsw(u_int port, const void *addr, size_t cnt)
357 __asm __volatile("cld; rep; outsw"
358 : "=S" (addr), "=c" (cnt)
359 : "0" (addr), "1" (cnt), "d" (port));
363 outsl(u_int port, const void *addr, size_t cnt)
365 __asm __volatile("cld; rep; outsl"
366 : "=S" (addr), "=c" (cnt)
367 : "0" (addr), "1" (cnt), "d" (port));
371 outw(u_int port, u_short data)
373 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
376 static __inline u_int
381 __asm __volatile("movl %%cr2,%0" : "=r" (data));
385 static __inline u_int
390 __asm __volatile("pushfl; popl %0" : "=r" (ef));
394 static __inline u_int64_t
399 __asm __volatile(".byte 0x0f, 0x32" : "=A" (rv) : "c" (msr));
403 static __inline u_int64_t
408 __asm __volatile(".byte 0x0f, 0x33" : "=A" (rv) : "c" (pmc));
412 static __inline u_int64_t
417 __asm __volatile(".byte 0x0f, 0x31" : "=A" (rv));
424 __asm __volatile("wbinvd");
428 write_eflags(u_int ef)
430 __asm __volatile("pushl %0; popfl" : : "r" (ef));
434 wrmsr(u_int msr, u_int64_t newval)
436 __asm __volatile(".byte 0x0f, 0x30" : : "A" (newval), "c" (msr));
439 static __inline u_int
443 __asm __volatile("movl %%fs,%0" : "=rm" (sel));
447 static __inline u_int
451 __asm __volatile("movl %%gs,%0" : "=rm" (sel));
458 __asm __volatile("movl %0,%%fs" : : "rm" (sel));
464 __asm __volatile("movl %0,%%gs" : : "rm" (sel));
467 static __inline u_int
471 __asm __volatile("movl %%dr0,%0" : "=r" (data));
478 __asm __volatile("movl %0,%%dr0" : : "r" (sel));
481 static __inline u_int
485 __asm __volatile("movl %%dr1,%0" : "=r" (data));
492 __asm __volatile("movl %0,%%dr1" : : "r" (sel));
495 static __inline u_int
499 __asm __volatile("movl %%dr2,%0" : "=r" (data));
506 __asm __volatile("movl %0,%%dr2" : : "r" (sel));
509 static __inline u_int
513 __asm __volatile("movl %%dr3,%0" : "=r" (data));
520 __asm __volatile("movl %0,%%dr3" : : "r" (sel));
523 static __inline u_int
527 __asm __volatile("movl %%dr4,%0" : "=r" (data));
534 __asm __volatile("movl %0,%%dr4" : : "r" (sel));
537 static __inline u_int
541 __asm __volatile("movl %%dr5,%0" : "=r" (data));
548 __asm __volatile("movl %0,%%dr5" : : "r" (sel));
551 static __inline u_int
555 __asm __volatile("movl %%dr6,%0" : "=r" (data));
562 __asm __volatile("movl %0,%%dr6" : : "r" (sel));
565 static __inline u_int
569 __asm __volatile("movl %%dr7,%0" : "=r" (data));
576 __asm __volatile("movl %0,%%dr7" : : "r" (sel));
579 #else /* !__GNUC__ */
581 int breakpoint __P((void));
582 u_int bsfl __P((u_int mask));
583 u_int bsrl __P((u_int mask));
584 void disable_intr __P((void));
585 void do_cpuid __P((u_int ax, u_int *p));
586 void enable_intr __P((void));
587 u_char inb __P((u_int port));
588 u_int inl __P((u_int port));
589 void insb __P((u_int port, void *addr, size_t cnt));
590 void insl __P((u_int port, void *addr, size_t cnt));
591 void insw __P((u_int port, void *addr, size_t cnt));
592 void invd __P((void));
593 void invlpg __P((u_int addr));
594 void invltlb __P((void));
595 u_short inw __P((u_int port));
596 u_int loadandclear __P((u_int *addr));
597 void outb __P((u_int port, u_char data));
598 void outl __P((u_int port, u_int data));
599 void outsb __P((u_int port, void *addr, size_t cnt));
600 void outsl __P((u_int port, void *addr, size_t cnt));
601 void outsw __P((u_int port, void *addr, size_t cnt));
602 void outw __P((u_int port, u_short data));
603 u_int rcr2 __P((void));
604 u_int64_t rdmsr __P((u_int msr));
605 u_int64_t rdpmc __P((u_int pmc));
606 u_int64_t rdtsc __P((void));
607 u_int read_eflags __P((void));
608 void wbinvd __P((void));
609 void write_eflags __P((u_int ef));
610 void wrmsr __P((u_int msr, u_int64_t newval));
611 u_int rfs __P((void));
612 u_int rgs __P((void));
613 void load_fs __P((u_int sel));
614 void load_gs __P((u_int sel));
616 #endif /* __GNUC__ */
618 void load_cr0 __P((u_int cr0));
619 void load_cr3 __P((u_int cr3));
620 void load_cr4 __P((u_int cr4));
621 void ltr __P((u_short sel));
622 u_int rcr0 __P((void));
623 u_int rcr3 __P((void));
624 u_int rcr4 __P((void));
625 void reset_dbregs __P((void));
628 #endif /* !_MACHINE_CPUFUNC_H_ */