Return to setivec.c CVS log

Up to [MW Coherent from dump] / coherent / b / kernel / ldrv

Annotation of coherent/b/kernel/ldrv/setivec.c, revision 1.1.1.1

1.1       root        1: /* $Header: /kernel/kersrc/ldrv/RCS/setivec.c,v 1.1 92/07/17 15:27:57 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                     11:  *     An unpublished work by INETCO Systems, Ltd.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 - Enable/Disable Interrupts.
                     17:  *
                     18:  * $Log:       setivec.c,v $
                     19:  * Revision 1.1  92/07/17  15:27:57  bin
                     20:  * Initial revision
                     21:  * 
                     22:  * Revision 1.1        88/03/24  16:31:02      src
                     23:  * Initial revision
                     24:  * 
                     25:  * 87/12/03    Allan Cornish           /usr/src/sys/ldrv/setivec.c
                     26:  * Initial version.
                     27:  */
                     28: #include <sys/coherent.h>
                     29: #include <errno.h>
                     30: #include <sys/con.h>
                     31: #include <sys/uproc.h>
                     32: 
                     33: /*
                     34:  * Interrupt entry points [within kernel] for loadable drivers.
                     35:  */
                     36: extern void (*ldrvint[16])();
                     37: 
                     38: /*
                     39:  * Interrupt handlers [within driver] for loadable drivers.
                     40:  *     ldrvics[n]:     Interrupt handler code segment.
                     41:  *     ldrvipc[n]:     Interrupt handler program counter.
                     42:  */
                     43: extern saddr_t ldrvics[16];
                     44: extern void  (*ldrvipc[16])();
                     45: 
                     46: setivec( level, func )
                     47: int level;
                     48: void (*func)();
                     49: {
                     50:        extern void Ksetivec();
                     51:        extern saddr_t ucs;
                     52: 
                     53:        u.u_error = 0;
                     54:        level &= 15;
                     55: 
                     56:        /*
                     57:         * Ensure interrupt is not already in use.
                     58:         */
                     59:        if ( (ldrvics[level] != 0) || (ldrvipc[level] != NULL) ) {
                     60:                u.u_error = EDBUSY;
                     61:                return;
                     62:        }
                     63: 
                     64:        /*
                     65:         * Record interrupt function BEFORE enabling interrupt.
                     66:         */
                     67:        ldrvipc[level] = func;
                     68:        ldrvics[level] = ucs;
                     69: 
                     70:        /*
                     71:         * Attempt to enable interrupt.
                     72:         */
                     73:        kcall( Ksetivec, level, ldrvint[level] );
                     74: 
                     75:        /*
                     76:         * Interrupt is in use by a resident driver.
                     77:         */
                     78:        if ( u.u_error ) {
                     79:                ldrvipc[level] = NULL;
                     80:                ldrvics[level] = 0;
                     81:        }
                     82: }
                     83: 
                     84: clrivec( level )
                     85: register int level;
                     86: {
                     87:        extern void Kclrivec();
                     88:        extern saddr_t ucs;
                     89: 
                     90:        level &= 15;
                     91: 
                     92:        /*
                     93:         * Ensure interrupt belongs to our process.
                     94:         */
                     95:        if ( ldrvics[level] != ucs ) {
                     96:                u.u_error = EPERM;
                     97:                return;
                     98:        }
                     99: 
                    100:        /*
                    101:         * Disable interrupt.
                    102:         */
                    103:        kcall( Kclrivec, level );
                    104: 
                    105:        /*
                    106:         * Erase interrupt function AFTER disabling interrupt.
                    107:         */
                    108:        ldrvipc[level] = NULL;
                    109:        ldrvics[level] = 0;
                    110: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.