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

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)cpu.h 5.4 (Berkeley) 5/9/91
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_CPU_H_
    #define _MACHINE_CPU_H_
    
    /*
     * Definitions unique to i386 cpu support.
     */
    #include <machine/psl.h>
    #include <machine/frame.h>
    #include <machine/segments.h>
    
    /*
     * definitions of cpu-dependent requirements
     * referenced in generic code
     */
    #undef  COPY_SIGCODE            /* don't copy sigcode above user stack in exec */
    
    #define cpu_exec(p)     /* nothing */
    #define cpu_swapin(p)   /* nothing */
    #define cpu_setstack(p, ap)             ((p)->p_md.md_regs[SP] = (ap))
    #define cpu_set_init_frame(p, fp)       ((p)->p_md.md_regs = (fp))
    
    #define CLKF_USERMODE(framep) \
            ((ISPL((framep)->cf_cs) == SEL_UPL) || (framep->cf_eflags & PSL_VM))
    
    #define CLKF_INTR(framep)       (intr_nesting_level >= 2)
    #if 0
    /*
     * XXX splsoftclock() is very broken and barely worth fixing.  It doesn't
     * turn off the clock bit in imen or in the icu.  (This is not a serious
     * problem at 100 Hz but it is serious at 16000 Hz for pcaudio.  softclock()
     * can take more than 62.5 usec so clock interrupts are lost.)  It doesn't
     * check for pending interrupts being unmasked.  clkintr() and Xintr0()
     * assume that the ipl is high when hardclock() returns.  Our SWI_AST
     * handling is efficient enough that little is gained by calling
     * softclock() directly.
     */
    #define CLKF_BASEPRI(framep)    (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
    #else
    #define CLKF_BASEPRI(framep)    (0)
    #endif
    #define CLKF_PC(framep)         ((framep)->cf_eip)
    
    /*
     * Preempt the current process if in interrupt from user mode,
     * or after the current trap/syscall if in system mode.
     */
    #define need_resched()  { want_resched = 1; aston(); }
    
    #define resched_wanted()        want_resched
    
    /*
     * Arrange to handle pending profiling ticks before returning to user mode.
     *
     * XXX this is now poorly named and implemented.  It used to handle only a
     * single tick and the P_OWEUPC flag served as a counter.  Now there is a
     * counter in the proc table and flag isn't really necessary.
     */
    #define need_proftick(p)        { (p)->p_flag |= P_OWEUPC; aston(); }
    
    /*
    * Notify the current process (p) that it has a signal pending,
    * process as soon as possible.
    */
   #define signotify(p)    aston()
   
   #define aston() setsoftast()
   #define astoff()
   
   /*
    * CTL_MACHDEP definitions.
    */
   #define CPU_CONSDEV             1       /* dev_t: console terminal device */
   #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
   #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
   #define CPU_BOOTINFO            4       /* struct: bootinfo */
   #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
   #define CPU_MAXID               6       /* number of valid machdep ids */
   
   #define CTL_MACHDEP_NAMES { \
           { 0, 0 }, \
           { "console_device", CTLTYPE_STRUCT }, \
           { "adjkerntz", CTLTYPE_INT }, \
           { "disable_rtc_set", CTLTYPE_INT }, \
           { "bootinfo", CTLTYPE_STRUCT }, \
           { "wall_cmos_clock", CTLTYPE_INT }, \
   }
   
   #ifdef KERNEL
   extern char     btext[];
   extern char     etext[];
   extern u_char   intr_nesting_level;
   extern int      want_resched;   /* resched was called */
   
   void    fork_trampoline __P((void));
   void    fork_return __P((struct proc *, struct trapframe));
   void    cpu_set_fork_handler __P((struct proc *, void (*pc)(void *), void *));
   #endif
   
   #endif /* !_MACHINE_CPU_H_ */

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