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Annotation of coherent/f/etc/conf/streams/src/ddientry.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * This file contains the entry points into the STREAMS system called by the
        !             3:  * Coherent kernel.
        !             4:  */
        !             5: 
        !             6: #define        _DDI_DKI        1
        !             7: #define        _SYSV3          1
        !             8: 
        !             9: #include <kernel/ddi_cpu.h>
        !            10: #include <kernel/ddi_glob.h>
        !            11: #include <sys/confinfo.h>
        !            12: #include <sys/types.h>
        !            13: #include <sys/cmn_err.h>
        !            14: #include <stdlib.h>
        !            15: 
        !            16: #ifdef __MSDOS__
        !            17: #include <sys/_con.h>
        !            18: #else
        !            19: #include <sys/con.h>
        !            20: #endif
        !            21: 
        !            22: 
        !            23: /*
        !            24:  * Refer to memory allocated by "space.c" file from tunable parameters.
        !            25:  */
        !            26: 
        !            27: extern size_t  _streams_size;
        !            28: extern uchar_t _streams_heap [];
        !            29: 
        !            30: 
        !            31: __EXTERN_C_BEGIN__
        !            32: 
        !            33: int            INTR_INIT       __PROTO ((void));
        !            34: int            DDI_GLOB_INIT   __PROTO ((void));
        !            35: int            KMEM_INIT       __PROTO ((_VOID * _addr, size_t _size));
        !            36: int            LOCK_TESTS      __PROTO ((int _negative));
        !            37: 
        !            38: __EXTERN_C_END__
        !            39: 
        !            40: 
        !            41: #if    __BORLANDC__
        !            42: 
        !            43: void           SETIVEC         __PROTO ((int _num));
        !            44: void           CLRIVEC         __PROTO ((int _num));
        !            45: 
        !            46: #elif  __COHERENT__
        !            47: 
        !            48: void           setivec         __PROTO ((int _num, intthunk_t _thunk));
        !            49: void           clrivec         __PROTO ((int _num));
        !            50: 
        !            51: #define        SETIVEC(num)    setivec (inttab [num].int_vector, \
        !            52:                                 inttab [num].int_thunk)
        !            53: 
        !            54: #define        CLRIVEC(num)    clrivec (inttab [num].int_vector)
        !            55: 
        !            56: #else  /* if ! __COHERENT */
        !            57: 
        !            58: #error How do I set up interrupts?
        !            59: 
        !            60: #endif /* ! __COHERENT__ */
        !            61: 
        !            62: 
        !            63: /*
        !            64:  * Global start/exit state. We use this so that if an exit or halt routine
        !            65:  * panics (which may cause a retry of the shutdown process) we can try again.
        !            66:  */
        !            67: 
        !            68: static int     _exitlevel;
        !            69: static int     _intlevel;
        !            70: static int     _haltlevel;
        !            71: 
        !            72: 
        !            73: /*
        !            74:  * Since we don't have a real trap-handler, I have factored out the deferred-
        !            75:  * function check to here.
        !            76:  *
        !            77:  * Entered with interrupts disabled. This routine must be able to enable
        !            78:  * interrupts without causing excess stack growth. Note that if we have
        !            79:  * interrupt prologue and epilogue code in assembly language, a rather
        !            80:  * different loop structure might work out simpler.
        !            81:  */
        !            82: 
        !            83: #if    __USE_PROTO__
        !            84: __LOCAL__ int (RUN_INT_DEFER) (defer_t * deferp)
        !            85: #else
        !            86: __LOCAL__ int
        !            87: RUN_INT_DEFER __ARGS ((deferp))
        !            88: defer_t              * deferp;
        !            89: #endif
        !            90: {
        !            91:        int             recheck = 0;
        !            92:        int             idx;
        !            93: 
        !            94:        /*
        !            95:         * If we detected a non-empty global defer table, try and lock the
        !            96:         * table before processing the deferred routines. Only try once; if
        !            97:         * the table is busy, then someone else must be dealing with it.
        !            98:         */
        !            99: 
        !           100:        if (ATOMIC_FETCH_AND_STORE_UCHAR (deferp->df_rlock, 1) != 0)
        !           101:                return 1;
        !           102: 
        !           103:        while ((idx = ATOMIC_FETCH_UCHAR (deferp->df_read)) !=
        !           104:                        ATOMIC_FETCH_UCHAR (deferp->df_write)) {
        !           105:                __CHEAP_ENABLE_INTS ();
        !           106: 
        !           107:                (* deferp->df_tab [idx ++]) ();
        !           108: 
        !           109:                if (idx == ATOMIC_FETCH_UCHAR (deferp->df_max))
        !           110:                        idx = 0;
        !           111: 
        !           112:                ATOMIC_STORE_UCHAR (deferp->df_read, idx);
        !           113: 
        !           114:                recheck = 1;
        !           115: 
        !           116:                __CHEAP_DISABLE_INTS ();
        !           117:        }
        !           118: 
        !           119:        /*
        !           120:         * Release the lock on the global defer table.
        !           121:         */
        !           122: 
        !           123:        ATOMIC_STORE_UCHAR (deferp->df_rlock, 0);
        !           124: 
        !           125:        return recheck;
        !           126: }
        !           127: 
        !           128: #ifdef __MSDOS__
        !           129: 
        !           130: #include <dos.h>
        !           131: 
        !           132: void CHECK_DEFER (void) {
        !           133:        while (RUN_INT_DEFER (& ddi_global_data ()->dg_defint) ||
        !           134:               RUN_INT_DEFER (& ddi_cpu_data ()->dc_defint))
        !           135:                (* (char __far *) MK_FP (0xB800, 6)) ++;
        !           136: 
        !           137:        /*
        !           138:         * For breaking out of bad situations... hold right shift.
        !           139:         */
        !           140: 
        !           141:        if ((* (char __far *) MK_FP (0x40, 0x17) & 1) != 0)
        !           142:                cmn_err (CE_PANIC, "Emergency abort!");
        !           143: 
        !           144: }
        !           145: #endif
        !           146: 
        !           147: #ifdef __COHERENT__
        !           148: 
        !           149: #if    __USE_PROTO__
        !           150: void (STREAMS_SCHEDULER) (void)
        !           151: #else
        !           152: void
        !           153: STREAMS_SCHEDULER __ARGS (())
        !           154: #endif
        !           155: {
        !           156:        __CHEAP_DISABLE_INTS ();
        !           157: 
        !           158:        while (RUN_INT_DEFER (& ddi_global_data ()->dg_defint) ||
        !           159:               RUN_INT_DEFER (& ddi_cpu_data ()->dc_defint))
        !           160:                ;       /* DO NOTHING */
        !           161: 
        !           162:        __CHEAP_ENABLE_INTS ();
        !           163: }
        !           164: #endif /* ! defined (__COHERENT__) */
        !           165: 
        !           166: 
        !           167: /*
        !           168:  * Shut things down, in the right order.
        !           169:  */
        !           170: 
        !           171: #if    __USE_PROTO__
        !           172: void (STREAMS_EXIT) (void)
        !           173: #else
        !           174: void
        !           175: STREAMS_EXIT __ARGS (())
        !           176: #endif
        !           177: {
        !           178:        spltimeout ();
        !           179:        ddi_cpu_data ()->dc_int_level = 0;
        !           180: 
        !           181:        while (_exitlevel > 0)
        !           182:                (* exittab [-- _exitlevel]) ();
        !           183: 
        !           184:        /*
        !           185:         * Turn off interrupts.
        !           186:         */
        !           187: 
        !           188:        while (_intlevel > 0)
        !           189:                CLRIVEC (-- _intlevel);
        !           190: 
        !           191:        while (_haltlevel > 0)
        !           192:                (* halttab [-- _haltlevel]) ();
        !           193: }
        !           194: 
        !           195: 
        !           196: /*
        !           197:  * Get an old Coherent "CON" entry.
        !           198:  */
        !           199: 
        !           200: #if    __USE_PROTO__
        !           201: CON * (STREAMS_GETCON) (o_dev_t dev)
        !           202: #else
        !           203: CON *
        !           204: STREAMS_GETCON __ARGS ((dev))
        !           205: o_dev_t                dev;
        !           206: #endif
        !           207: {
        !           208:        int             omajor = (dev >> 8) & 0xFF;
        !           209: 
        !           210:        return (omajor > _maxmajor || _major [omajor] == NODEV) ? NULL :
        !           211:                        & cdevsw [_major [omajor]].cdev_con;
        !           212: }
        !           213: 
        !           214: 
        !           215: /*
        !           216:  * Start things up, in the right order. If we can't proceed, panic.
        !           217:  */
        !           218: 
        !           219: #if    __USE_PROTO__
        !           220: void (STREAMS_INIT) (void)
        !           221: #else
        !           222: void
        !           223: STREAMS_INIT __ARGS (())
        !           224: #endif
        !           225: {
        !           226:        int             i;
        !           227: 
        !           228:        /*
        !           229:         * We call upon INTR_INIT () to ensure that we can call spl... ()
        !           230:         * functions safely. For some environments, this needs to take note of
        !           231:         * the existing interrupt masks.
        !           232:         */
        !           233: 
        !           234:        while (INTR_INIT ())
        !           235:                cmn_err (CE_PANIC, "Initial DDI/DKI setup failed");
        !           236: 
        !           237: #ifdef __MSDOS__
        !           238:        /*
        !           239:         * Arrange for the exit routines to be called eventually.
        !           240:         */
        !           241: 
        !           242:        atexit (STREAMS_EXIT);
        !           243: #endif
        !           244: 
        !           245:        /*
        !           246:         * Bootstrap the heap allocator. The allocation routines may need
        !           247:         * locking (which needs an allocator), but we depend on KMEM_INIT ()
        !           248:         * to deal with that.
        !           249:         */
        !           250: 
        !           251:        while (KMEM_INIT (_streams_heap, _streams_size) != 0)
        !           252:                cmn_err (CE_PANIC, "Unable to initalise STREAMS heap");
        !           253: 
        !           254:        /*
        !           255:         * Other global initialization which can proceed now we have an
        !           256:         * allocation system active.
        !           257:         */
        !           258: 
        !           259:        while (DDI_GLOB_INIT ())
        !           260:                cmn_err (CE_PANIC, "Unable to set up DDI/DKI global data");
        !           261: 
        !           262:        /*
        !           263:         * After the defer tables have been set up, we can call LOCK_TESTS (),
        !           264:         * which we couldn't before because the ..._DEALLOC () calls that the
        !           265:         * tests perform at the end require defer-table support.
        !           266:         */
        !           267: 
        !           268:        if (LOCK_TESTS (0))
        !           269:                cmn_err (CE_PANIC, "Lock primitives not functional");
        !           270: 
        !           271:        /*
        !           272:         * Call the configured init routines for the system. According to the
        !           273:         * specification of init (D2DK), this happens before interrupts are
        !           274:         * enabled and before there is any real process context for us to
        !           275:         * be able to sleep.
        !           276:         */
        !           277: 
        !           278:        for (i = 0 ; i < ninit ; i ++)
        !           279:                (* inittab [i]) ();
        !           280: 
        !           281:        _exitlevel = nexit;
        !           282: 
        !           283: 
        !           284:        /*
        !           285:         * Now we can configure the interrupts for the system.
        !           286:         */
        !           287: 
        !           288:        for (_intlevel = 0 ; _intlevel < nintr ; _intlevel ++)
        !           289:                SETIVEC (_intlevel);
        !           290: 
        !           291:        splbase ();
        !           292: 
        !           293: 
        !           294:        /*
        !           295:         * And finally, we can call the start routines.
        !           296:         */
        !           297: 
        !           298:        for (i = 0 ; i < nstart ; i ++)
        !           299:                (* starttab [i]) ();
        !           300: 
        !           301: }
        !           302: 

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