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Annotation of coherent/d/286_KERNEL/USRSRC/ldrv/setivec.c, revision 1.1.1.1

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                     11:  *     An unpublished work by INETCO Systems, Ltd.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

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