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Annotation of coherent/d/286_KERNEL/USRSRC/io/shmcon.c, revision 1.1

1.1     ! root        1: /* $Header: /usr/src/sys/i8086/drv/RCS/shmcon.c,v 2.1 88/09/03 13:12:40 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, 1985, 1984.
        !            11:  *     An unpublished work by INETCO Systems, Ltd.
        !            12:  *     All rights reserved.
        !            13:  */
        !            14: 
        !            15: /*
        !            16:  * System V Compatible Shared Memory Device Driver
        !            17:  *
        !            18:  *     This device driver provides System V compatible shared memory operations.
        !            19:  *     Operations are performed through the shared memory device (/dev/shm).
        !            20:  *     and are implemented as ioctl calls from shmctl, shmget, shmat, shmdt
        !            21:  *     utilities.
        !            22:  *
        !            23:  *                     Author: Allan Cornish, INETCO Systems Ltd., Sep 1984
        !            24:  *
        !            25:  * $Log:       /usr/src/sys/i8086/drv/RCS/shmcon.c,v $
        !            26:  * Revision 2.1        88/09/03  13:12:40      src
        !            27:  * *** empty log message ***
        !            28:  * 
        !            29:  * Revision 1.1        88/03/24  17:06:36      src
        !            30:  * Initial revision
        !            31:  * 
        !            32:  * 87/03/02    Allan Cornish           /usr/src/sys/i8086/drv/shmcon.c
        !            33:  * Shmioctl() now supports long key [was short] on SHMGET operations.
        !            34:  * This allows compatability with System V.
        !            35:  *
        !            36:  * 85/10/16    Allan Cornish
        !            37:  * Driver split into shmcon.c, shm.c [driver implementation, system V shm].
        !            38:  *
        !            39:  * 85/07/22    Allan Cornish
        !            40:  * Shmget, shmctl now return immediately if u.u_error is set.
        !            41:  *
        !            42:  * 85/07/19    Allan Cornish
        !            43:  * Separation of io_seek into shmid and off improved through type casting.
        !            44:  * Errno set to EFAULT if fucopy() or ufcopy() report no bytes transferred.
        !            45:  * This would occur if an user address fault occurred.
        !            46:  *
        !            47:  * 85/07/03    Allan Cornish
        !            48:  * Replaced use of EDOM with EIDRM.
        !            49:  * Replaced shmaccess() by calls to ipcaccess(), increasing shared ipc code.
        !            50:  * Eliminated shmlock() and shmunlock(), as shared memory use is synchronous.
        !            51:  *
        !            52:  * 84/09/30    Allan Cornish
        !            53:  * Initial Revision.
        !            54:  */
        !            55: 
        !            56: #include <coherent.h>
        !            57: #include <sched.h>
        !            58: #include <types.h>
        !            59: #include <uproc.h>
        !            60: #include <errno.h>
        !            61: #include <stat.h>
        !            62: #include <con.h>
        !            63: #include <seg.h>
        !            64: #include <shm.h>
        !            65: 
        !            66: #ifndef        EIDRM
        !            67: #define        EIDRM   EDOM
        !            68: #endif
        !            69: 
        !            70: /*
        !            71:  * Functions.
        !            72:  */
        !            73: 
        !            74: int shmload();
        !            75: int shmread();
        !            76: int shmwrite();
        !            77: int shmioctl();
        !            78: int nulldev();
        !            79: int nonedev();
        !            80: 
        !            81: /*
        !            82:  * Device Configuration.
        !            83:  */
        !            84: 
        !            85: CON shmcon = {
        !            86:        DFCHR,                  /* Flags                        */
        !            87:        24,                     /* Major Index                  */
        !            88:        nulldev,                /* Open                         */
        !            89:        nulldev,                /* Close                        */
        !            90:        nonedev,                /* Block                        */
        !            91:        shmread,                /* Read                         */
        !            92:        shmwrite,               /* Write                        */
        !            93:        shmioctl,               /* Ioctl                        */
        !            94:        nulldev,                /* Power fail                   */
        !            95:        nulldev,                /* Timeout                      */
        !            96:        shmload,                /* Load                         */
        !            97:        nulldev                 /* Unload                       */
        !            98: };
        !            99: 
        !           100: unsigned NSHMID = 16;
        !           101: struct shmid_ds *shmids;
        !           102: struct seg **shmsegs;
        !           103: 
        !           104: /*
        !           105:  * Shared Memory Device Load.
        !           106:  */
        !           107: 
        !           108: static
        !           109: shmload()
        !           110: {
        !           111:        register struct shmid_ds * idp;
        !           112:        register unsigned wanted;
        !           113:        
        !           114:        if ( NSHMID == 0 )
        !           115:                return 0;
        !           116: 
        !           117:        wanted = NSHMID * (sizeof(struct shmid_ds) + sizeof(struct seg *));
        !           118: 
        !           119:        if ( (shmids = kalloc( wanted )) == 0 ) {
        !           120: 
        !           121:                printf("couldn't kalloc %u shared memory ids\n", NSHMID );
        !           122:                NSHMID = 0;
        !           123:                return 0;
        !           124:        }
        !           125:        shmsegs = (struct seg *) &shmids[ NSHMID ];
        !           126: 
        !           127:        for ( idp = &shmids[NSHMID]; --idp >= shmids; )
        !           128:                idp->shm_perm.mode = 0;
        !           129: 
        !           130:        return 0;
        !           131: }
        !           132: 
        !           133: /*
        !           134: ** Shared Memory Read.
        !           135: */
        !           136: 
        !           137: static
        !           138: shmread( dev, iop )
        !           139: 
        !           140: dev_t dev;
        !           141: register IO *iop;
        !           142: 
        !           143: {
        !           144:        register struct shmid_ds *idp;
        !           145:        int shmid;
        !           146:        unsigned off;
        !           147:        faddr_t faddr;
        !           148: 
        !           149:        off   = ((unsigned *) &iop->io_seek)[0];
        !           150:        shmid = ((unsigned *) &iop->io_seek)[1];
        !           151: 
        !           152:        if ( shmid >= NSHMID ) {
        !           153:                u.u_error = EFAULT;
        !           154:                return -1;
        !           155:        }
        !           156: 
        !           157:        idp = &shmids[shmid];
        !           158: 
        !           159:        if ( (idp->shm_perm.mode & IPC_ALLOC) == 0 ) {
        !           160:                u.u_error = EIDRM;
        !           161:                return -1;
        !           162:        }
        !           163: 
        !           164:        if ( (ipcaccess(&idp->shm_perm) & SHM_R) == 0 ) {
        !           165:                u.u_error = EACCES;
        !           166:                return -1;
        !           167:        }
        !           168: 
        !           169:        if ( ((long) off + iop->io_ioc) > idp->shm_segsz ) {
        !           170:                u.u_error = EFAULT;
        !           171:                return -1;
        !           172:        }
        !           173: 
        !           174:        FP_SEL(faddr) = FP_SEL(shmsegs[shmid]->s_faddr);
        !           175:        FP_OFF(faddr) = off;
        !           176: 
        !           177:        if ( ! fucopy( faddr, iop->io_base, iop->io_ioc ) ) {
        !           178:                u.u_error = EFAULT;
        !           179:                return -1;
        !           180:        }
        !           181: 
        !           182:        iop->io_ioc = 0;
        !           183:        return 0;
        !           184: }
        !           185: 
        !           186: /*
        !           187: ** Shared Memory Write.
        !           188: */
        !           189: 
        !           190: static
        !           191: shmwrite( dev, iop )
        !           192: 
        !           193: dev_t dev;
        !           194: register IO *iop;
        !           195: 
        !           196: {
        !           197:        register struct shmid_ds *idp;
        !           198:        int shmid;
        !           199:        unsigned off;
        !           200:        faddr_t faddr;
        !           201: 
        !           202:        off   = ((unsigned *) &iop->io_seek)[0];
        !           203:        shmid = ((unsigned *) &iop->io_seek)[1];
        !           204: 
        !           205:        if ( shmid >= NSHMID ) {
        !           206:                u.u_error = EFAULT;
        !           207:                return -1;
        !           208:        }
        !           209: 
        !           210:        idp = &shmids[shmid];
        !           211: 
        !           212:        if ( (idp->shm_perm.mode & IPC_ALLOC) == 0 ) {
        !           213:                u.u_error = EIDRM;
        !           214:                return -1;
        !           215:        }
        !           216: 
        !           217:        if ( (ipcaccess(&idp->shm_perm) & SHM_W) == 0 ) {
        !           218:                u.u_error = EFAULT;
        !           219:                return -1;
        !           220:        }
        !           221: 
        !           222:        if ( ((long) off + iop->io_ioc) > idp->shm_segsz ) {
        !           223:                u.u_error = EFAULT;
        !           224:                return -1;
        !           225:        }
        !           226: 
        !           227:        FP_SEL(faddr) = FP_SEL(shmsegs[shmid]->s_faddr);
        !           228:        FP_OFF(faddr) = off;
        !           229: 
        !           230:        if ( ! ufcopy(iop->io_base, faddr, iop->io_ioc ) ) {
        !           231:                u.u_error = EFAULT;
        !           232:                return -1;
        !           233:        }
        !           234: 
        !           235:        iop->io_ioc = 0;
        !           236:        return 0;
        !           237: }
        !           238: 
        !           239: /*
        !           240:  * Shared Memory Device Ioctl.
        !           241:  *
        !           242:  *     Input:  dev = shared memory device (/dev/shm).
        !           243:  *             com = command to perform (SHMCTL, SHMGET,SHMAT).
        !           244:  *             vec = pointer to return value, followed by parameters.
        !           245:  *
        !           246:  *     Action: Initiate command.
        !           247:  *             Save commands return value in *vec.
        !           248:  */
        !           249: 
        !           250: static
        !           251: shmioctl( dev, com, vec )
        !           252: 
        !           253: dev_t dev;
        !           254: int com;
        !           255: int *vec;
        !           256: 
        !           257: {
        !           258:        switch ( com ) {
        !           259: 
        !           260:        case SHMCTL:
        !           261:                putuwd( vec+0,
        !           262:                        ushmctl( getuwd( vec+1 ),
        !           263:                                 getuwd( vec+2 ),
        !           264:                                 getuwd( vec+3 ) ));
        !           265:                break;
        !           266: 
        !           267:        case SHMGET:
        !           268:                putuwd( vec+0,
        !           269:                        ushmget( getuwd( vec+1 ),
        !           270:                                 getuwd( vec+2 ),
        !           271:                                 getuwd( vec+3 ),
        !           272:                                 getuwd( vec+4 ) ));
        !           273:                break;
        !           274: 
        !           275:        default:
        !           276:                u.u_error = EINVAL;
        !           277:                break;
        !           278:        }
        !           279: }

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