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