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Annotation of coherent/d/PS2_KERNEL/ldrv/timeout.c, revision 1.1.1.1

1.1       root        1: /* $Header: /kernel/kersrc/ldrv/RCS/timeout.c,v 1.1 92/07/17 15:28:10 bin Exp Locker: bin $ */
                      2: /*
                      3:  *     The  information  contained herein  is a trade secret  of INETCO
                      4:  *     Systems, and is confidential information.   It is provided under
                      5:  *     a license agreement,  and may be copied or disclosed  only under
                      6:  *     the terms of that agreement.   Any reproduction or disclosure of
                      7:  *     this  material  without  the express  written  authorization  of
                      8:  *     INETCO Systems or persuant to the license agreement is unlawful.
                      9:  *
                     10:  *     Copyright (c) 1987
                     11:  *     An unpublished work by INETCO Systems, Ltd.
                     12:  *     All rights reserved.
                     13:  */
                     14: 
                     15: /*
                     16:  * Loadable Driver - Timed functions.
                     17:  *
                     18:  * $Log:       timeout.c,v $
                     19:  * Revision 1.1  92/07/17  15:28:10  bin
                     20:  * Initial revision
                     21:  * 
                     22:  * Revision 1.1        88/03/24  16:31:21      src
                     23:  * Initial revision
                     24:  * 
                     25:  * 87/12/08    Allan Cornish   /usr/src/sys/ldrv/timeout.c
                     26:  * Timed loadable driver functions now supported.
                     27:  */
                     28: #include <sys/coherent.h>
                     29: 
                     30: /*
                     31:  * External functions.
                     32:  */
                     33: extern void Ktimeout();
                     34: extern void Kldtimcall();
                     35: extern saddr_t getcs();
                     36: 
                     37: /*
                     38:  * Given a pointer to a timeout structure, `tp', call the function `f'
                     39:  * with integer argument `a' in `n' ticks of the clock. The list is
                     40:  * searched to see if the specified timeout structure is already in a
                     41:  * list, and it is removed if already there.
                     42:  * This module is specific to loadable drivers.
                     43:  */
                     44: timeout( tp, n, f, a )
                     45: register TIM * tp;
                     46: int n;
                     47: void (*f)();
                     48: int a;
                     49: {
                     50:        register int s;
                     51: 
                     52:        /*
                     53:         * Cancel existing timer.
                     54:         */
                     55:        if ( (f == NULL) || (n <= 0) ) {
                     56:                kcall( Ktimeout, tp, 0, NULL, 0 );
                     57:                return;
                     58:        }
                     59: 
                     60:        /*
                     61:         * Define loadable driver interface.
                     62:         * Kldtimcall will be invoked when timeout occurs.
                     63:         * It will in turn invoke FP_SEL(tp->t_ldrv):4,
                     64:         *      passing FP_OFF(tp->t_ldrv) in AX.
                     65:         */
                     66:        s = sphi();
                     67:        FP_SEL(tp->t_ldrv) = getcs();
                     68:        FP_OFF(tp->t_ldrv) = f;
                     69:        kcall( Ktimeout, tp, n, Kldtimcall, a );
                     70:        spl(s);
                     71: }

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