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Annotation of coherent/d/PS2_KERNEL/i286/md2.c, revision 1.1

1.1     ! root        1: /* $Header: /kernel/kersrc/i286/RCS/md2.c,v 1.1 92/07/17 15:21:32 bin Exp Locker: bin $ */
        !             2: /* (lgl-
        !             3:  *     The information contained herein is a trade secret of Mark Williams
        !             4:  *     Company, and  is confidential information.  It is provided  under a
        !             5:  *     license agreement,  and may be  copied or disclosed  only under the
        !             6:  *     terms of  that agreement.  Any  reproduction or disclosure  of this
        !             7:  *     material without the express written authorization of Mark Williams
        !             8:  *     Company or persuant to the license agreement is unlawful.
        !             9:  *
        !            10:  *     COHERENT Version 2.3.37
        !            11:  *     Copyright (c) 1982, 1983, 1984.
        !            12:  *     An unpublished work by Mark Williams Company, Chicago.
        !            13:  *     All rights reserved.
        !            14:  -lgl) */
        !            15: /*
        !            16:  * 8086/8088 Coherent.
        !            17:  * IBM PC.
        !            18:  *
        !            19:  * $Log:       md2.c,v $
        !            20:  * Revision 1.1  92/07/17  15:21:32  bin
        !            21:  * Initial revision
        !            22:  * 
        !            23:  * Revision 1.1        88/03/24  17:33:38      src
        !            24:  * Initial revision
        !            25:  * 
        !            26:  * 87/10/26    Allan Cornish           /usr/src/sys/i8086/ibm_at/md2.c
        !            27:  * Clrivec() now properly resets the interrupt vector for intr 2 in slot 9.
        !            28:  */
        !            29: #include <sys/coherent.h>
        !            30: #include <sys/i8086.h>
        !            31: #include <sys/clist.h>
        !            32: #include <errno.h>
        !            33: #include <sys/inode.h>
        !            34: #include <sys/proc.h>
        !            35: #include <sys/seg.h>
        !            36: #include <signal.h>
        !            37: 
        !            38: int nirqslave;
        !            39: /*
        !            40:  * Set an interrupt vector.
        !            41:  * Make an entry in the "vecs" table, for
        !            42:  * use by the assist. Make sure that the channel
        !            43:  * on the 8259 is armed.
        !            44:  * Note that interrupt vectors 2 and 9 are mapped into channel 9.
        !            45:  */
        !            46: setivec(level, fun)
        !            47: register int   level;
        !            48: int            (*fun)();
        !            49: {
        !            50:        register int    picm;
        !            51:        extern   int    (*vecs[])();
        !            52:        extern   int    vret();
        !            53: 
        !            54:        if ((level &= 0x0F) == 2)
        !            55:                level = 9;
        !            56:        if (level==0 || vecs[level]!=&vret) {
        !            57:                u.u_error = EDBUSY;
        !            58:                return;
        !            59:        }
        !            60:        vecs[level] = fun;
        !            61:        if ( level >= 8 ) {
        !            62:                ++nirqslave;
        !            63:                picm = inb(SPICM);
        !            64:                picm &= ~(0x01 << (level-8));
        !            65:                outb(SPICM, picm);
        !            66:                level = 2;
        !            67:        }
        !            68:        picm = inb(PICM);
        !            69:        picm &= ~(0x01 << level);
        !            70:        outb(PICM, picm);
        !            71: }
        !            72: 
        !            73: /*
        !            74:  * Clear an interrupt vector.
        !            75:  */
        !            76: clrivec(level)
        !            77: register int   level;
        !            78: {
        !            79:        register int    picm;
        !            80:        extern   int    (*vecs[])();
        !            81:        extern   int    vret();
        !            82: 
        !            83:        if ((level &= 0x0F) == 2)
        !            84:                level = 9;
        !            85:        if (level == 0)
        !            86:                panic("clrivec: level=%d", level);
        !            87:        vecs[level] = &vret;
        !            88:        if (level >= 8) {
        !            89:                --nirqslave;
        !            90:                picm = inb(SPICM);
        !            91:                picm |= (0x01 << (level-8));
        !            92:                outb(SPICM, picm);
        !            93:                level = 2;
        !            94:        }
        !            95:        if ((level != 2) || (nirqslave == 0)) {
        !            96:                picm = inb(PICM);
        !            97:                picm |= (0x01 << level);
        !            98:                outb(PICM, picm);
        !            99:        }
        !           100: }

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