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/3/sys/i386/include/cpu.h 50582 1999-08-29 16:07:53Z peter $
   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 #define cpu_set_init_frame(p, fp)       ((p)->p_md.md_regs = (fp))
   60 
   61 #define CLKF_USERMODE(framep) \
   62         ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
   63 
   64 #define CLKF_INTR(framep)       (intr_nesting_level >= 2)
   65 #if 0
   66 /*
   67  * XXX splsoftclock() is very broken and barely worth fixing.  It doesn't
   68  * turn off the clock bit in imen or in the icu.  (This is not a serious
   69  * problem at 100 Hz but it is serious at 16000 Hz for pcaudio.  softclock()
   70  * can take more than 62.5 usec so clock interrupts are lost.)  It doesn't
   71  * check for pending interrupts being unmasked.  clkintr() and Xintr0()
   72  * assume that the ipl is high when hardclock() returns.  Our SWI_AST
   73  * handling is efficient enough that little is gained by calling
   74  * softclock() directly.
   75  */
   76 #define CLKF_BASEPRI(framep)    (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
   77 #else
   78 #define CLKF_BASEPRI(framep)    (0)
   79 #endif
   80 #define CLKF_PC(framep)         ((framep)->cf_eip)
   81 
   82 /*
   83  * Preempt the current process if in interrupt from user mode,
   84  * or after the current trap/syscall if in system mode.
   85  */
   86 #define need_resched()  { want_resched = 1; aston(); }
   87 
   88 #define resched_wanted()        want_resched
   89 
   90 /*
   91  * Arrange to handle pending profiling ticks before returning to user mode.
   92  *
   93  * XXX this is now poorly named and implemented.  It used to handle only a
   94  * single tick and the P_OWEUPC flag served as a counter.  Now there is a
   95  * counter in the proc table and flag isn't really necessary.
   96  */
   97 #define need_proftick(p)        { (p)->p_flag |= P_OWEUPC; aston(); }
   98 
   99 /*
  100  * Notify the current process (p) that it has a signal pending,
  101  * process as soon as possible.
  102  */
  103 #define signotify(p)    aston()
  104 
  105 #define aston() setsoftast()
  106 #define astoff()
  107 
  108 /*
  109  * CTL_MACHDEP definitions.
  110  */
  111 #define CPU_CONSDEV             1       /* dev_t: console terminal device */
  112 #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
  113 #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
  114 #define CPU_BOOTINFO            4       /* struct: bootinfo */
  115 #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
  116 #define CPU_MAXID               6       /* number of valid machdep ids */
  117 
  118 #define CTL_MACHDEP_NAMES { \
  119         { 0, 0 }, \
  120         { "console_device", CTLTYPE_STRUCT }, \
  121         { "adjkerntz", CTLTYPE_INT }, \
  122         { "disable_rtc_set", CTLTYPE_INT }, \
  123         { "bootinfo", CTLTYPE_STRUCT }, \
  124         { "wall_cmos_clock", CTLTYPE_INT }, \
  125 }
  126 
  127 #ifdef KERNEL
  128 extern char     btext[];
  129 extern char     etext[];
  130 extern u_char   intr_nesting_level;
  131 extern int      want_resched;   /* resched was called */
  132 
  133 void    fork_trampoline __P((void));
  134 void    fork_return __P((struct proc *, struct trapframe));
  135 void    cpu_set_fork_handler __P((struct proc *, void (*pc)(void *), void *));
  136 #endif
  137 
  138 #endif /* !_MACHINE_CPU_H_ */

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