The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/cpu.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
   37  * $FreeBSD: releng/5.1/sys/i386/include/cpu.h 110368 2003-02-05 08:55:10Z phk $
   38  */
   39 
   40 #ifndef _MACHINE_CPU_H_
   41 #define _MACHINE_CPU_H_
   42 
   43 /*
   44  * Definitions unique to i386 cpu support.
   45  */
   46 #include <machine/psl.h>
   47 #include <machine/frame.h>
   48 #include <machine/segments.h>
   49 
   50 /*
   51  * definitions of cpu-dependent requirements
   52  * referenced in generic code
   53  */
   54 #undef  COPY_SIGCODE            /* don't copy sigcode above user stack in exec */
   55 
   56 #define cpu_exec(p)     /* nothing */
   57 #define cpu_swapin(p)   /* nothing */
   58 #define cpu_getstack(td)                ((td)->td_frame->tf_esp)
   59 #define cpu_setstack(td, ap)            ((td)->td_frame->tf_esp = (ap))
   60 
   61 #define TRAPF_USERMODE(framep) \
   62         ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
   63 #define TRAPF_PC(framep)        ((framep)->tf_eip)
   64 
   65 #define CLKF_USERMODE(framep) \
   66         ((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
   67 #define CLKF_PC(framep)         ((framep)->cf_eip)
   68 
   69 /*
   70  * CTL_MACHDEP definitions.
   71  */
   72 #define CPU_CONSDEV             1       /* dev_t: console terminal device */
   73 #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
   74 #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
   75 #define CPU_BOOTINFO            4       /* struct: bootinfo */
   76 #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
   77 #define CPU_MAXID               6       /* number of valid machdep ids */
   78 
   79 #define CTL_MACHDEP_NAMES { \
   80         { 0, 0 }, \
   81         { "console_device", CTLTYPE_STRUCT }, \
   82         { "adjkerntz", CTLTYPE_INT }, \
   83         { "disable_rtc_set", CTLTYPE_INT }, \
   84         { "bootinfo", CTLTYPE_STRUCT }, \
   85         { "wall_cmos_clock", CTLTYPE_INT }, \
   86 }
   87 
   88 #ifdef _KERNEL
   89 extern char     btext[];
   90 extern char     etext[];
   91 extern u_int    tsc_present;
   92 
   93 void    fork_trampoline(void);
   94 
   95 /*
   96  * Return contents of in-cpu fast counter as a sort of "bogo-time"
   97  * for random-harvesting purposes.
   98  */
   99 static __inline u_int64_t
  100 get_cyclecount(void)
  101 {
  102 #if defined(I386_CPU) || defined(I486_CPU)
  103         struct bintime bt;
  104 
  105         if (!tsc_present) {
  106                 binuptime(&bt);
  107                 return (bt.frac ^ bt.sec);
  108         }
  109 #endif
  110         return (rdtsc());
  111 }
  112 
  113 #endif
  114 
  115 #endif /* !_MACHINE_CPU_H_ */

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