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Annotation of coherent/d/286_KERNEL/USRSRC/ldrv/setivec.c, revision 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        !            11:  *     An unpublished work by INETCO Systems, Ltd.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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