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Annotation of Net2/arch/i386/include/cpu.h, revision 1.1.1.1

1.1       root        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:  *     @(#)cpu.h       5.4 (Berkeley) 5/9/91
                     37:  */
                     38: 
                     39: /*
                     40:  * Definitions unique to i386 cpu support.
                     41:  */
                     42: #include "machine/frame.h"
                     43: #include "machine/segments.h"
                     44: 
                     45: /*
                     46:  * definitions of cpu-dependent requirements
                     47:  * referenced in generic code
                     48:  */
                     49: #undef COPY_SIGCODE            /* don't copy sigcode above user stack in exec */
                     50: 
                     51: /*
                     52:  * function vs. inline configuration;
                     53:  * these are defined to get generic functions
                     54:  * rather than inline or machine-dependent implementations
                     55:  */
                     56: #define        NEED_MINMAX             /* need {,i,l,ul}{min,max} functions */
                     57: #define        NEED_FFS                /* need ffs function */
                     58: #define        NEED_BCMP               /* need bcmp function */
                     59: #define        NEED_STRLEN             /* need strlen function */
                     60: 
                     61: #define        cpu_exec(p)     /* nothing */
                     62: 
                     63: /*
                     64:  * Arguments to hardclock, softclock and gatherstats
                     65:  * encapsulate the previous machine state in an opaque
                     66:  * clockframe; for now, use generic intrframe.
                     67:  */
                     68: typedef struct intrframe clockframe;
                     69: 
                     70: #define        CLKF_USERMODE(framep)   (ISPL((framep)->if_cs) == SEL_UPL)
                     71: #define        CLKF_BASEPRI(framep)    ((framep)->if_ppl == 0)
                     72: #define        CLKF_PC(framep)         ((framep)->if_eip)
                     73: 
                     74: #define        resettodr()     /* no todr to set */
                     75: 
                     76: /*
                     77:  * Preempt the current process if in interrupt from user mode,
                     78:  * or after the current trap/syscall if in system mode.
                     79:  */
                     80: #define        need_resched()  { want_resched++; aston(); }
                     81: 
                     82: /*
                     83:  * Give a profiling tick to the current process from the softclock
                     84:  * interrupt.  On tahoe, request an ast to send us through trap(),
                     85:  * marking the proc as needing a profiling tick.
                     86:  */
                     87: #define        profile_tick(p, framep) { (p)->p_flag |= SOWEUPC; aston(); }
                     88: 
                     89: /*
                     90:  * Notify the current process (p) that it has a signal pending,
                     91:  * process as soon as possible.
                     92:  */
                     93: #define        signotify(p)    aston()
                     94: 
                     95: #define aston() (astpending++)
                     96: 
                     97: int    astpending;             /* need to trap before returning to user mode */
                     98: int    want_resched;           /* resched() was called */
                     99: 
                    100: /*
                    101:  * Kinds of processor
                    102:  */
                    103: 
                    104: #define        CPU_386SX       0
                    105: #define        CPU_386         1
                    106: #define        CPU_486SX       2
                    107: #define        CPU_486         3
                    108: #define        CPU_586         4

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