Home | History | Annotate | Line # | Download | only in include
cpufunc.h revision 1.8 
      1 /*	$NetBSD: cpufunc.h,v 1.8 1994/10/27 04:15:59 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993 Charles Hannum.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Charles Hannum.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _I386_CPUFUNC_H_
     34 #define	_I386_CPUFUNC_H_
     35 
     36 /*
     37  * Functions to provide access to i386-specific instructions.
     38  */
     39 
     40 #include <sys/cdefs.h>
     41 #include <sys/types.h>
     42 
     43 static __inline int bdb(void)
     44 {
     45 	extern int bdb_exists;
     46 
     47 	if (!bdb_exists)
     48 		return (0);
     49 	__asm __volatile("int $3");
     50 	return (1);
     51 }
     52 
     53 static __inline void
     54 lidt(void *p)
     55 {
     56 	__asm __volatile("lidt (%0)" : : "r" (p));
     57 }
     58 
     59 static __inline void
     60 lldt(u_short sel)
     61 {
     62 	__asm __volatile("lldt %0" : : "r" (sel));
     63 }
     64 
     65 static __inline void
     66 ltr(u_short sel)
     67 {
     68 	__asm __volatile("ltr %0" : : "r" (sel));
     69 }
     70 
     71 static __inline void
     72 lcr0(u_int val)
     73 {
     74 	__asm __volatile("movl %0,%%cr0" : : "r" (val));
     75 }
     76 
     77 static __inline u_int
     78 rcr0(void)
     79 {
     80 	u_int val;
     81 	__asm __volatile("movl %%cr0,%0" : "=r" (val));
     82 	return val;
     83 }
     84 
     85 static __inline u_int
     86 rcr2(void)
     87 {
     88 	u_int val;
     89 	__asm __volatile("movl %%cr2,%0" : "=r" (val));
     90 	return val;
     91 }
     92 
     93 static __inline void
     94 lcr3(u_int val)
     95 {
     96 	__asm __volatile("movl %0,%%cr3" : : "r" (val));
     97 }
     98 
     99 static __inline u_int
    100 rcr3(void)
    101 {
    102 	u_int val;
    103 	__asm __volatile("movl %%cr3,%0" : "=r" (val));
    104 	return val;
    105 }
    106 
    107 static __inline void
    108 tlbflush(void)
    109 {
    110 	u_int val;
    111 	__asm __volatile("movl %%cr3,%0" : "=r" (val));
    112 	__asm __volatile("movl %0,%%cr3" : : "r" (val));
    113 }
    114 
    115 #ifdef notyet
    116 void	setidt	__P((int idx, /*XXX*/caddr_t func, int typ, int dpl));
    117 #endif
    118 
    119 
    120 /* XXXX ought to be in psl.h with spl() functions */
    121 
    122 static __inline void
    123 disable_intr(void)
    124 {
    125 	__asm __volatile("cli");
    126 }
    127 
    128 static __inline void
    129 enable_intr(void)
    130 {
    131 	__asm __volatile("sti");
    132 }
    133 
    134 #endif /* !_I386_CPUFUNC_H_ */
    135