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: stable/4/sys/i386/include/cpu.h 118695 2003-08-09 16:21:21Z luoqi $
   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_setstack(p, ap)             ((p)->p_md.md_regs[SP] = (ap))
   59 
   60 #define CLKF_USERMODE(framep) \
   61         ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
   62 
   63 #define CLKF_INTR(framep)       (intr_nesting_level >= 2)
   64 #if 0
   65 /*
   66  * XXX splsoftclock() is very broken and barely worth fixing.  It doesn't
   67  * turn off the clock bit in imen or in the icu.  (This is not a serious
   68  * problem at 100 Hz but it is serious at 16000 Hz for pcaudio.  softclock()
   69  * can take more than 62.5 usec so clock interrupts are lost.)  It doesn't
   70  * check for pending interrupts being unmasked.  clkintr() and Xintr0()
   71  * assume that the ipl is high when hardclock() returns.  Our SWI_CLOCK
   72  * handling is efficient enough that little is gained by calling
   73  * softclock() directly.
   74  */
   75 #define CLKF_BASEPRI(framep)    ((framep)->cf_ppl == 0)
   76 #else
   77 #define CLKF_BASEPRI(framep)    (0)
   78 #endif
   79 #define CLKF_PC(framep)         ((framep)->cf_eip)
   80 
   81 /*
   82  * Preempt the current process if in interrupt from user mode,
   83  * or after the current trap/syscall if in system mode.
   84  *
   85  * XXX: if astpending is later changed to an |= here due to more flags being
   86  * added, we will have an atomicy problem.  The type of atomicy we need is
   87  * a non-locked orl.
   88  */
   89 #define need_resched()          do { astpending = AST_RESCHED|AST_PENDING; } while (0)
   90 #define resched_wanted()        (astpending & AST_RESCHED)
   91 
   92 /*
   93  * Arrange to handle pending profiling ticks before returning to user mode.
   94  *
   95  * XXX this is now poorly named and implemented.  It used to handle only a
   96  * single tick and the P_OWEUPC flag served as a counter.  Now there is a
   97  * counter in the proc table and flag isn't really necessary.
   98  */
   99 #define need_proftick(p) \
  100         do { (p)->p_flag |= P_OWEUPC; aston(); } while (0)
  101 
  102 /*
  103  * Notify the current process (p) that it has a signal pending,
  104  * process as soon as possible.
  105  *
  106  * XXX: aston() really needs to be an atomic (not locked, but an orl),
  107  * in case need_resched() is set by an interrupt.  But with astpending a
  108  * per-cpu variable this is not trivial to do efficiently.  For now we blow
  109  * it off (asynchronous need_resched() conflicts are not critical).
  110  */
  111 #define signotify(p)    aston()
  112 
  113 #define aston()                 do { astpending |= AST_PENDING; } while (0)
  114 #define astoff()
  115 
  116 /*
  117  * CTL_MACHDEP definitions.
  118  */
  119 #define CPU_CONSDEV             1       /* dev_t: console terminal device */
  120 #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
  121 #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
  122 #define CPU_BOOTINFO            4       /* struct: bootinfo */
  123 #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
  124 #define CPU_MAXID               6       /* number of valid machdep ids */
  125 
  126 #define CTL_MACHDEP_NAMES { \
  127         { 0, 0 }, \
  128         { "console_device", CTLTYPE_STRUCT }, \
  129         { "adjkerntz", CTLTYPE_INT }, \
  130         { "disable_rtc_set", CTLTYPE_INT }, \
  131         { "bootinfo", CTLTYPE_STRUCT }, \
  132         { "wall_cmos_clock", CTLTYPE_INT }, \
  133 }
  134 
  135 #ifdef _KERNEL
  136 extern char     btext[];
  137 extern char     etext[];
  138 extern char     KERNend[];
  139 extern u_char   intr_nesting_level;
  140 
  141 void    fork_trampoline __P((void));
  142 void    fork_return __P((struct proc *, struct trapframe));
  143 #endif
  144 
  145 #endif /* !_MACHINE_CPU_H_ */

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