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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _MACHINE_CPU_H_
   37 #define _MACHINE_CPU_H_
   38 
   39 /*
   40  * Definitions unique to i386 cpu support.
   41  */
   42 #include <machine/psl.h>
   43 #include <machine/frame.h>
   44 #include <machine/segments.h>
   45 
   46 /*
   47  * definitions of cpu-dependent requirements
   48  * referenced in generic code
   49  */
   50 #undef  COPY_SIGCODE            /* don't copy sigcode above user stack in exec */
   51 
   52 #define cpu_exec(p)     /* nothing */
   53 #define cpu_swapin(p)   /* nothing */
   54 #define cpu_getstack(td)                ((td)->td_frame->tf_esp)
   55 #define cpu_setstack(td, ap)            ((td)->td_frame->tf_esp = (ap))
   56 #define cpu_spinwait()                  ia32_pause()
   57 
   58 #define TRAPF_USERMODE(framep) \
   59         ((ISPL((framep)->tf_cs) == SEL_UPL) || ((framep)->tf_eflags & PSL_VM))
   60 #define TRAPF_PC(framep)        ((framep)->tf_eip)
   61 
   62 #define CLKF_USERMODE(framep) \
   63         ((ISPL((framep)->cf_cs) == SEL_UPL) || ((framep)->cf_eflags & PSL_VM))
   64 #define CLKF_PC(framep)         ((framep)->cf_eip)
   65 
   66 /*
   67  * CTL_MACHDEP definitions.
   68  */
   69 #define CPU_CONSDEV             1       /* dev_t: console terminal device */
   70 #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
   71 #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
   72 #define CPU_BOOTINFO            4       /* struct: bootinfo */
   73 #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
   74 #define CPU_MAXID               6       /* number of valid machdep ids */
   75 
   76 #define CTL_MACHDEP_NAMES { \
   77         { 0, 0 }, \
   78         { "console_device", CTLTYPE_STRUCT }, \
   79         { "adjkerntz", CTLTYPE_INT }, \
   80         { "disable_rtc_set", CTLTYPE_INT }, \
   81         { "bootinfo", CTLTYPE_STRUCT }, \
   82         { "wall_cmos_clock", CTLTYPE_INT }, \
   83 }
   84 
   85 #ifdef _KERNEL
   86 extern char     btext[];
   87 extern char     etext[];
   88 extern u_int    tsc_present;
   89 
   90 void    cpu_halt(void);
   91 void    cpu_reset(void);
   92 void    fork_trampoline(void);
   93 void    swi_vm(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(I486_CPU) || defined(KLD_MODULE)
  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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