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Annotation of 43BSD/sys/mdec/raboot.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: /* "@(#)raboot.s       7.1 (Berkeley) 6/5/86" */
        !             8: 
        !             9:        .set    MAJOR,9                 /* major("/dev/ra0a") */
        !            10: 
        !            11: /*
        !            12:  * 1st level boot program: loads next 7.5Kbytes from
        !            13:  * boot sector of file system and sets it up to run.
        !            14:  * Except for MAJOR definition above, should work
        !            15:  * with any disk using 750 boot rom.
        !            16:  */
        !            17:        .set    RELOC,0x50000
        !            18:        .set    BOOTLAST,15             /* last boot sector */
        !            19:        .set    RABPSECT,512            /* bytes per sector */
        !            20: 
        !            21: init:
        !            22:        .word   0                       /* entry mask for dec monitor */
        !            23:        nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
        !            24:        nop;nop;
        !            25: start:
        !            26:        movl    $MAJOR,r10              /* major("/dev/xx0a") */
        !            27:        extzv   $18,$1,r1,r4            /* get UBA number from R1 */
        !            28:        xorb2   $0x01,r4                /* complement bit */
        !            29:        insv    r4,$24,$8,r10           /* set UBA number */
        !            30:        insv    r3,$16,$8,r10           /* drive number */
        !            31:        extzv   $12,$4,r5,r4            /* get partition from r5 */
        !            32:        bicw2   $0xf000,r5              /* remove from r5 */
        !            33:        insv    r4,$8,$8,r10            /* set partition */
        !            34:        movl    r5,r11                  /* boot flags */
        !            35:        movl    r1,r9                   /* UNIBUS I/O page address */
        !            36:        movl    r2,r8                   /* boot device CSR */
        !            37:        movl    r3,r7                   /* unit number */
        !            38:        movl    $RELOC,sp
        !            39:        moval   init,r4
        !            40:        movc3   $end,(r4),(sp)
        !            41:        movl    r9,r1                   /* UNIBUS I/O page address */
        !            42:        movl    r8,r2                   /* boot device CSR */
        !            43:        movl    r7,r3                   /* unit number */
        !            44:        jmp     *$RELOC+start2
        !            45: /* now running relocated */
        !            46: /* bring in the boot program */
        !            47: start2:                                        /* running relocated */
        !            48:        pushr   $0xffff                 /* BEGIN FIREWALL */
        !            49:        movl    $1,r4                   /* first boot sector */
        !            50:        clrl    r5                      /* transfer address */
        !            51:        clrl    -(sp)                   /* transfer address */
        !            52: 1:
        !            53:        movl    r4,r8                   /* requested sector # */
        !            54:        jsb     (r6)                    /* call ROM-based driver */
        !            55:        blbs    r0,2f
        !            56:        halt                            /* read error */
        !            57: 2:
        !            58:        addl2   $RABPSECT,r5            /* bump address */
        !            59:        movl    r5,(sp)
        !            60:        aobleq  $BOOTLAST,r4,1b
        !            61: 
        !            62:        .set    PROGSIZE,(BOOTLAST*RABPSECT)
        !            63: done:
        !            64:        tstl    (sp)+                   /* pop address */
        !            65:        popr    $0xffff                 /* END FIREWALL */
        !            66:        movl    $PROGSIZE,r4
        !            67: clrcor:
        !            68:        clrq    (r4)
        !            69:        acbl    $RELOC,$8,r4,clrcor
        !            70: /* start loaded program */
        !            71:        calls   $0,*$0
        !            72:        brw     start2
        !            73: end:

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