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Annotation of researchv9/sys/boot/stand/spinning.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * @(#)spinning.c 1.1 86/02/03 Copyright (c) 1985 by Sun Microsystems, Inc.
        !             3:  */
        !             4: #include <sys/types.h>
        !             5: #include <sys/inode.h>
        !             6: #include "saio.h"
        !             7: #include <machine/sunromvec.h>
        !             8: 
        !             9: char msg_spinup[] = "\n\007Waiting for disk to spin up...\n\n\
        !            10: Please start it, if necessary, -OR- press any key to quit.\n\n";
        !            11: char msg_noctlr[] = "No controller at mbio %x\n";
        !            12: 
        !            13: /*
        !            14:  * Returns 0 if disk is apparently not spinning, after waiting awhile.
        !            15:  * Returns 1 if disk is already spinning on entry to this routine.
        !            16:  * Returns 2 if disk starts spinning sometime after entry to this routine.
        !            17:  * Returns <0 if (*isready)() returns a negative result at any time.
        !            18:  * 
        !            19:  * If on initial entry, after a suitable delay, the disk is not spinning,
        !            20:  * we produce a message to remind the user to turn on the disk.
        !            21:  */
        !            22: int
        !            23: isspinning(isready, addr, data) 
        !            24:        int (*isready)();
        !            25:        char *addr;
        !            26:        int data;
        !            27: {
        !            28:        register int r;
        !            29:        long t;
        !            30: 
        !            31:        /*
        !            32:         * Wait for disk to spin up, if necessary.
        !            33:         */
        !            34:        r = (*isready)(addr, data);
        !            35:        if (r < 0)
        !            36:                return r;               /* Error */
        !            37:        if (r)
        !            38:                return 1;               /* Already spinning */
        !            39:        DELAY(1000000);                 /* RTZ can take a long time */
        !            40:        r = (*isready)(addr, data);
        !            41:        if (r < 0)
        !            42:                return r;
        !            43:        if (r)
        !            44:                return 2;               /* Spun up while we waited */
        !            45:        while ((*romp->v_mayget)() != -1)               /* clear typeahead */
        !            46:                ;
        !            47:        printf(msg_spinup);
        !            48:        t = (3*60*1000) + *romp->v_nmiclock; /* quitting time in 3 minutes */
        !            49: 
        !            50:        for (;;) {
        !            51:                r = (*isready)(addr, data);     /* Test disk */
        !            52:                if (r < 0)
        !            53:                        return r;
        !            54:                if (r)
        !            55:                        return 2;
        !            56:                if ((*romp->v_mayget)() != -1)  /* Test keyboard */
        !            57:                        return 0;
        !            58:                if (*romp->v_nmiclock > t) {    /* Test timer */
        !            59:                        printf("Giving up...\n");
        !            60:                        return 0;
        !            61:                }       
        !            62:        }                                       /* Loop */
        !            63: }

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