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/i386/include/Attic/cpufunc.h,v 1.10 2005/03/06 05:05:52 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 "lock.h" /* XXX */
61 #ifdef SWTCH_OPTIM_STATS
62 extern int tlb_flush_count; /* XXX */
68 __asm __volatile("int $3");
72 * Find the first 1 in mask, starting with bit 0 and return the
73 * bit number. If mask is 0 the result is undefined.
80 __asm __volatile("bsfl %0,%0" : "=r" (result) : "0" (mask));
85 * Find the last 1 in mask, starting with bit 31 and return the
86 * bit number. If mask is 0 the result is undefined.
93 __asm __volatile("bsrl %0,%0" : "=r" (result) : "0" (mask));
98 * Test and set the specified bit (1 << bit) in the integer. The
99 * previous value of the bit is returned (0 or 1).
102 btsl(u_int *mask, int bit)
106 __asm __volatile("btsl %2,%1; movl $0,%0; adcl $0,%0" :
107 "=r"(result), "=m"(*mask) : "r" (bit));
112 * Test and clear the specified bit (1 << bit) in the integer. The
113 * previous value of the bit is returned (0 or 1).
116 btrl(u_int *mask, int bit)
120 __asm __volatile("btrl %2,%1; movl $0,%0; adcl $0,%0" :
121 "=r"(result), "=m"(*mask) : "r" (bit));
126 do_cpuid(u_int ax, u_int *p)
128 __asm __volatile("cpuid"
129 : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3])
134 cpu_disable_intr(void)
136 __asm __volatile("cli" : : : "memory");
140 cpu_enable_intr(void)
142 __asm __volatile("sti");
148 __asm __volatile("" : : : "memory");
154 __asm __volatile("cpuid" : : : "ax", "bx", "cx", "dx", "memory");
157 #define HAVE_INLINE_FFS
163 * Note that gcc-2's builtin ffs would be used if we didn't declare
164 * this inline or turn off the builtin. The builtin is faster but
165 * broken in gcc-2.4.5 and slower but working in gcc-2.5 and later
168 return (mask == 0 ? mask : (int)bsfl((u_int)mask) + 1);
171 #define HAVE_INLINE_FLS
176 return (mask == 0 ? mask : (int) bsrl((u_int)mask) + 1);
180 * The following complications are to get around gcc not having a
181 * constraint letter for the range 0..255. We still put "d" in the
182 * constraint because "i" isn't a valid constraint when the port
183 * isn't constant. This only matters for -O0 because otherwise
184 * the non-working version gets optimized away.
186 * Use an expression-statement instead of a conditional expression
187 * because gcc-2.6.0 would promote the operands of the conditional
188 * and produce poor code for "if ((inb(var) & const1) == const2)".
190 * The unnecessary test `(port) < 0x10000' is to generate a warning if
191 * the `port' has type u_short or smaller. Such types are pessimal.
192 * This actually only works for signed types. The range check is
193 * careful to avoid generating warnings.
195 #define inb(port) __extension__ ({ \
197 if (__builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
198 && (port) < 0x10000) \
199 _data = inbc(port); \
201 _data = inbv(port); \
204 #define outb(port, data) ( \
205 __builtin_constant_p(port) && ((port) & 0xffff) < 0x100 \
206 && (port) < 0x10000 \
207 ? outbc(port, data) : outbv(port, data))
209 static __inline u_char
214 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
219 outbc(u_int port, u_char data)
221 __asm __volatile("outb %0,%1" : : "a" (data), "id" ((u_short)(port)));
224 static __inline u_char
229 * We use %%dx and not %1 here because i/o is done at %dx and not at
230 * %edx, while gcc generates inferior code (movw instead of movl)
231 * if we tell it to load (u_short) port.
233 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
237 static __inline u_int
242 __asm __volatile("inl %%dx,%0" : "=a" (data) : "d" (port));
247 insb(u_int port, void *addr, size_t cnt)
249 __asm __volatile("cld; rep; insb"
250 : "=D" (addr), "=c" (cnt)
251 : "0" (addr), "1" (cnt), "d" (port)
256 insw(u_int port, void *addr, size_t cnt)
258 __asm __volatile("cld; rep; insw"
259 : "=D" (addr), "=c" (cnt)
260 : "0" (addr), "1" (cnt), "d" (port)
265 insl(u_int port, void *addr, size_t cnt)
267 __asm __volatile("cld; rep; insl"
268 : "=D" (addr), "=c" (cnt)
269 : "0" (addr), "1" (cnt), "d" (port)
276 __asm __volatile("invd");
282 * If we are not a true-SMP box then smp_invltlb() is a NOP. Note that this
283 * will cause the invl*() functions to be equivalent to the cpu_invl*()
287 void smp_invltlb(void);
289 #define smp_invltlb()
293 * Invalidate a patricular VA on this cpu only
296 cpu_invlpg(void *addr)
298 __asm __volatile("invlpg %0" : : "m" (*(char *)addr) : "memory");
302 * Invalidate the TLB on this cpu only
309 * This should be implemented as load_cr3(rcr3()) when load_cr3()
312 __asm __volatile("movl %%cr3, %0; movl %0, %%cr3" : "=r" (temp)
314 #if defined(SWTCH_OPTIM_STATS)
321 static __inline u_short
326 __asm __volatile("inw %%dx,%0" : "=a" (data) : "d" (port));
330 static __inline u_int
331 loadandclear(volatile u_int *addr)
335 __asm __volatile("xorl %0,%0; xchgl %1,%0"
336 : "=&r" (result) : "m" (*addr));
341 outbv(u_int port, u_char data)
345 * Use an unnecessary assignment to help gcc's register allocator.
346 * This make a large difference for gcc-1.40 and a tiny difference
347 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
348 * best results. gcc-2.6.0 can't handle this.
351 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
355 outl(u_int port, u_int data)
358 * outl() and outw() aren't used much so we haven't looked at
359 * possible micro-optimizations such as the unnecessary
360 * assignment for them.
362 __asm __volatile("outl %0,%%dx" : : "a" (data), "d" (port));
366 outsb(u_int port, const void *addr, size_t cnt)
368 __asm __volatile("cld; rep; outsb"
369 : "=S" (addr), "=c" (cnt)
370 : "0" (addr), "1" (cnt), "d" (port));
374 outsw(u_int port, const void *addr, size_t cnt)
376 __asm __volatile("cld; rep; outsw"
377 : "=S" (addr), "=c" (cnt)
378 : "0" (addr), "1" (cnt), "d" (port));
382 outsl(u_int port, const void *addr, size_t cnt)
384 __asm __volatile("cld; rep; outsl"
385 : "=S" (addr), "=c" (cnt)
386 : "0" (addr), "1" (cnt), "d" (port));
390 outw(u_int port, u_short data)
392 __asm __volatile("outw %0,%%dx" : : "a" (data), "d" (port));
395 static __inline u_int
400 __asm __volatile("movl %%cr2,%0" : "=r" (data));
404 static __inline u_int
409 __asm __volatile("pushfl; popl %0" : "=r" (ef));
413 static __inline u_int64_t
418 __asm __volatile(".byte 0x0f, 0x32" : "=A" (rv) : "c" (msr));
422 static __inline u_int64_t
427 __asm __volatile(".byte 0x0f, 0x33" : "=A" (rv) : "c" (pmc));
431 static __inline u_int64_t
436 __asm __volatile(".byte 0x0f, 0x31" : "=A" (rv));
443 __asm __volatile("wbinvd");
447 write_eflags(u_int ef)
449 __asm __volatile("pushl %0; popfl" : : "r" (ef));
453 wrmsr(u_int msr, u_int64_t newval)
455 __asm __volatile(".byte 0x0f, 0x30" : : "A" (newval), "c" (msr));
458 static __inline u_int
462 __asm __volatile("movl %%fs,%0" : "=rm" (sel));
466 static __inline u_int
470 __asm __volatile("movl %%gs,%0" : "=rm" (sel));
477 __asm __volatile("movl %0,%%fs" : : "rm" (sel));
483 __asm __volatile("movl %0,%%gs" : : "rm" (sel));
486 static __inline u_int
490 __asm __volatile("movl %%dr0,%0" : "=r" (data));
497 __asm __volatile("movl %0,%%dr0" : : "r" (sel));
500 static __inline u_int
504 __asm __volatile("movl %%dr1,%0" : "=r" (data));
511 __asm __volatile("movl %0,%%dr1" : : "r" (sel));
514 static __inline u_int
518 __asm __volatile("movl %%dr2,%0" : "=r" (data));
525 __asm __volatile("movl %0,%%dr2" : : "r" (sel));
528 static __inline u_int
532 __asm __volatile("movl %%dr3,%0" : "=r" (data));
539 __asm __volatile("movl %0,%%dr3" : : "r" (sel));
542 static __inline u_int
546 __asm __volatile("movl %%dr4,%0" : "=r" (data));
553 __asm __volatile("movl %0,%%dr4" : : "r" (sel));
556 static __inline u_int
560 __asm __volatile("movl %%dr5,%0" : "=r" (data));
567 __asm __volatile("movl %0,%%dr5" : : "r" (sel));
570 static __inline u_int
574 __asm __volatile("movl %%dr6,%0" : "=r" (data));
581 __asm __volatile("movl %0,%%dr6" : : "r" (sel));
584 static __inline u_int
588 __asm __volatile("movl %%dr7,%0" : "=r" (data));
595 __asm __volatile("movl %0,%%dr7" : : "r" (sel));
598 #else /* !__GNUC__ */
600 int breakpoint (void);
601 u_int bsfl (u_int mask);
602 u_int bsrl (u_int mask);
603 void cpu_disable_intr (void);
604 void do_cpuid (u_int ax, u_int *p);
605 void cpu_enable_intr (void);
606 u_char inb (u_int port);
607 u_int inl (u_int port);
608 void insb (u_int port, void *addr, size_t cnt);
609 void insl (u_int port, void *addr, size_t cnt);
610 void insw (u_int port, void *addr, size_t cnt);
612 u_short inw (u_int port);
613 u_int loadandclear (u_int *addr);
614 void outb (u_int port, u_char data);
615 void outl (u_int port, u_int data);
616 void outsb (u_int port, void *addr, size_t cnt);
617 void outsl (u_int port, void *addr, size_t cnt);
618 void outsw (u_int port, void *addr, size_t cnt);
619 void outw (u_int port, u_short data);
621 u_int64_t rdmsr (u_int msr);
622 u_int64_t rdpmc (u_int pmc);
623 u_int64_t rdtsc (void);
624 u_int read_eflags (void);
626 void write_eflags (u_int ef);
627 void wrmsr (u_int msr, u_int64_t newval);
630 void load_fs (u_int sel);
631 void load_gs (u_int sel);
633 #endif /* __GNUC__ */
635 void load_cr0 (u_int cr0);
636 void load_cr3 (u_int cr3);
637 void load_cr4 (u_int cr4);
638 void ltr (u_short sel);
642 void reset_dbregs (void);
645 #endif /* !_MACHINE_CPUFUNC_H_ */