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Annotation of 43BSDTahoe/sys/mdec/hpboot.s.rom, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 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: /* "%W% (Berkeley) %G%" */
        !             8: 
        !             9: #define PARTITION              /* Partition is in bits 12 to 15 of R5
        !            10: 
        !            11: /*
        !            12:  * RP??/RM?? 1st level boot program: loads next 7.5Kbytes from
        !            13:  * boot sector of file system and sets it up to run.
        !            14:  * Reads from the controller and drive passed in from the boot
        !            15:  * rom.
        !            16:  *   R1:  address of the boot devices's adapter
        !            17:  *   R2:  controller number of the boot device
        !            18:  *   R3:  unit number of the boot device
        !            19:  *   R5:  software boot control flags
        !            20:  *   R6:  address of driver subroutine from ROM
        !            21:  *   SP:  base address of usable memory + 0x200
        !            22:  */
        !            23:        .set    BOOTLAST,15             /* last boot sector */
        !            24:        .set    RPBPSECT,512            /* bytes per sector */
        !            25:        .set    RELOC,0x70000
        !            26: 
        !            27: init:
        !            28:        .word   0                       /* entry mask for DEC monitor */
        !            29:        nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
        !            30:        nop;nop;
        !            31: start:
        !            32:        clrl    r10                     /* major("/dev/hp0a") */
        !            33:        extzv   $13,$2,r1,r4            /* get MBA number from R1 */
        !            34:        insv    r4,$24,$8,r10           /* set MBA number */
        !            35:        insv    r3,$16,$8,r10           /* drive number */
        !            36: #ifdef PARTITION
        !            37:        extzv   $12,$4,r5,r4            /* get partition from r5 */
        !            38:        bicw2   $0xf000,r5              /* remove from r5 */
        !            39:        insv    r4,$8,$4,r10            /* set partition */
        !            40: #endif
        !            41:        movl    r5,r11                  /* Save software boot control flags */
        !            42:        movl    $RELOC,sp
        !            43:                                        /* Save register during move */
        !            44:        movl    r1,r7                   /* MBA adapter address */
        !            45:        movl    r2,r8                   /* controller number */
        !            46:        movl    r3,r9                   /* unit number */
        !            47:        moval   init,r4
        !            48:        movc3   $end,(r4),(sp)
        !            49:                                        /* Restore registers */
        !            50:        movl    r7,r1                   /* MBA adapter address */
        !            51:        movl    r8,r2                   /* controller number */
        !            52:        movl    r9,r3                   /* unit number */
        !            53:        jmp     *$RELOC+start2
        !            54: /* now running relocated */
        !            55: /* bring in the boot program */
        !            56: start2:                                        /* running relocated */
        !            57:        pushr   $0xffff                 /* BEGIN FIREWALL */
        !            58:        movl    $1,r4                   /* first boot sector */
        !            59:        clrl    r5                      /* transfer address */
        !            60:        clrl    -(sp)                   /* transfer address */
        !            61: 1:
        !            62:        movl    r4,r8                   /* requested sector # */
        !            63:        jsb     (r6)                    /* call ROM-based driver */
        !            64:        blbs    r0,2f
        !            65:        halt                            /* read error */
        !            66: 2:
        !            67:        addl2   $RPBPSECT,r5            /* bump address */
        !            68:        movl    r5,(sp)
        !            69:        aobleq  $BOOTLAST,r4,1b
        !            70: 
        !            71:        .set    PROGSIZE,(BOOTLAST*RPBPSECT)
        !            72: done:
        !            73:        tstl    (sp)+                   /* pop address */
        !            74:        popr    $0xffff                 /* END FIREWALL */
        !            75: 
        !            76: /* clear core and execute program */
        !            77:        movl    $PROGSIZE,r4
        !            78: clrcor:
        !            79:        clrq    (r4)
        !            80:        acbl    $RELOC,$8,r4,clrcor
        !            81: /* run loaded program */
        !            82:        calls   $0,*$0
        !            83:        brw     start2
        !            84: 
        !            85: end:

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