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Annotation of coherent/d/PS2_KERNEL/i286/md2.c, revision 1.1.1.1

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                     12:  *     An unpublished work by Mark Williams Company, Chicago.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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