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Annotation of 43BSD/sys/mdec/mttoggle.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: _sccsid:.asciz "@(#)mttoggle.s 7.1 (Berkeley) 6/5/86"
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Prototype toggle in bootstrap code for mt type tapes.
        !            13:  * If on anything but a 780 with a tape at drive 0 of mba 1
        !            14:  * this will have to be repaired by patching mba and mt.
        !            15:  */
        !            16:        movl    mba,r10
        !            17:        mull3   mt,$0x80,r11
        !            18:        addl3   r11,r10,r11
        !            19:        addl2   $0x400,r11
        !            20:        movzbl  $1,4(r10)
        !            21:        movzbl  $4,8(r11)               /* drive zero, one record */
        !            22:        clrl    12(r10)                 /* set address to zero */
        !            23:        movl    $0x80000000,0x800(r10)  /* validate map register */
        !            24:        cvtwl   $-512,16(r10)           /* set byte count */
        !            25:        movzwl  $512,20(r11)            /* set byte count */
        !            26: 0:
        !            27:        movl    0x44(r11),r0
        !            28:        bbc     $15,r0,0b
        !            29:        movzbl  $071,(r11)              /* read forward, go */
        !            30:        halt
        !            31:        .align  2
        !            32: mba:   .long   0x20012000
        !            33: mt:    .long   0

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