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: src/sys/i386/include/cpu.h,v 1.25.2.3 1999/09/05 08:11:43 peter Exp $
   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/frame.h>
   47 #include <machine/segments.h>
   48 
   49 /*
   50  * Architecture dependent constant for i386 based machines.
   51  */
   52 #ifdef PC98
   53 /* NEC PC-9801/9821 series and compatibles. */
   54 #define MACHINE_ARCH    "pc-98"
   55 #else
   56 /* IBM-PC compatibles. */
   57 #define MACHINE_ARCH    "ibm-pc"
   58 #endif
   59 
   60 /*
   61  * definitions of cpu-dependent requirements
   62  * referenced in generic code
   63  */
   64 #undef  COPY_SIGCODE            /* don't copy sigcode above user stack in exec */
   65 
   66 #define cpu_exec(p)     /* nothing */
   67 #define cpu_swapin(p)   /* nothing */
   68 #define cpu_setstack(p, ap)             ((p)->p_md.md_regs[SP] = (ap))
   69 #define cpu_set_init_frame(p, fp)       ((p)->p_md.md_regs = (fp))
   70 
   71 #define CLKF_USERMODE(framep)   (ISPL((framep)->cf_cs) == SEL_UPL)
   72 #define CLKF_INTR(framep)       (intr_nesting_level >= 2)
   73 #if 0
   74 /*
   75  * XXX splsoftclock() is very broken and barely worth fixing.  It doesn't
   76  * turn off the clock bit in imen or in the icu.  (This is not a serious
   77  * problem at 100 Hz but it is serious at 16000 Hz for pcaudio.  softclock()
   78  * can take more than 62.5 usec so clock interrupts are lost.)  It doesn't
   79  * check for pending interrupts being unmasked.  clkintr() and Xintr0()
   80  * assume that the ipl is high when hardclock() returns.  Our SWI_AST
   81  * handling is efficient enough that little is gained by calling
   82  * softclock() directly.
   83  */
   84 #define CLKF_BASEPRI(framep)    (((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
   85 #else
   86 #define CLKF_BASEPRI(framep)    (0)
   87 #endif
   88 #define CLKF_PC(framep)         ((framep)->cf_eip)
   89 
   90 /*
   91  * Preempt the current process if in interrupt from user mode,
   92  * or after the current trap/syscall if in system mode.
   93  */
   94 #define need_resched()  { want_resched = 1; aston(); }
   95 
   96 /*
   97  * Arrange to handle pending profiling ticks before returning to user mode.
   98  *
   99  * XXX this is now poorly named and implemented.  It used to handle only a
  100  * single tick and the P_OWEUPC flag served as a counter.  Now there is a
  101  * counter in the proc table and flag isn't really necessary.
  102  */
  103 #define need_proftick(p)        { (p)->p_flag |= P_OWEUPC; aston(); }
  104 
  105 /*
  106  * Notify the current process (p) that it has a signal pending,
  107  * process as soon as possible.
  108  */
  109 #define signotify(p)    aston()
  110 
  111 #define aston() setsoftast()
  112 #define astoff()
  113 
  114 /*
  115  * pull in #defines for kinds of processors
  116  */
  117 #include <machine/cputypes.h>
  118 
  119 struct cpu_nameclass {
  120         char *cpu_name;
  121         int  cpu_class;
  122 };
  123 
  124 /*
  125  * CTL_MACHDEP definitions.
  126  */
  127 #define CPU_CONSDEV             1       /* dev_t: console terminal device */
  128 #define CPU_ADJKERNTZ           2       /* int: timezone offset (seconds) */
  129 #define CPU_DISRTCSET           3       /* int: disable resettodr() call */
  130 #define CPU_BOOTINFO            4       /* struct: bootinfo */
  131 #define CPU_WALLCLOCK           5       /* int: indicates wall CMOS clock */
  132 #define CPU_MAXID               6       /* number of valid machdep ids */
  133 
  134 #define CTL_MACHDEP_NAMES { \
  135         { 0, 0 }, \
  136         { "console_device", CTLTYPE_STRUCT }, \
  137         { "adjkerntz", CTLTYPE_INT }, \
  138         { "disable_rtc_set", CTLTYPE_INT }, \
  139         { "bootinfo", CTLTYPE_STRUCT }, \
  140         { "wall_cmos_clock", CTLTYPE_INT }, \
  141 }
  142 
  143 #ifdef KERNEL
  144 extern int      cpu;
  145 extern int      cpu_class;
  146 extern u_char   intr_nesting_level;
  147 extern int      want_resched;   /* resched was called */
  148 #endif
  149 
  150 #endif /* !_MACHINE_CPU_H_ */

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