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Annotation of 43BSD/sys/mdec/tstoggle.s, revision 1.1.1.1

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 "@(#)tstoggle.s 7.1 (Berkeley) 6/5/86"
                      9: #endif not lint
                     10: 
                     11: /*
                     12:  * Prototype toggle in bootstrap code for ts type tapes.
                     13:  * If on anything but a 780 with the drive on uba0
                     14:  * this will have to be repaired by patching uba and umem.
                     15:  */
                     16:        .set    UBA0,0x20006000
                     17:        .set    UMEM0,0x2013e000
                     18:        .set    UBA_MAP,0x800
                     19:        .set    TSADDR,0772520-0760000
                     20: 
                     21: start:
                     22:        movl    uba,r10
                     23:        movl    mrv,UBA_MAP(r10)
                     24:        addl3   mrv,$1,UBA_MAP+4(r10)
                     25:        addl3   umem,$TSADDR,r11
                     26:        clrw    2(r11)
                     27: 1:     tstb    2(r11)
                     28:        bgeq    1b
                     29:        movw    $0x200+setchr,(r11)
                     30: 1:     tstb    2(r11)
                     31:        bgeq    1b
                     32:        movw    $0x200+read,(r11)
                     33:        halt
                     34:        .align  2
                     35: uba:   .long   UBA0
                     36: umem:  .long   UMEM0
                     37: mrv:   .long   0x80000000
                     38: setchr:        .word   0xc004,0x200+char,0,0x8 # set characteristics command
                     39: char:  .word   0x200+status,0,0xe,0    # characteristics
                     40: read:  .word   0xc001,0,0,0x200        # read command
                     41: status:

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