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Annotation of 43BSDTahoe/sys/mdec/upboot.c, 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: /* "@(#)upboot.c       7.3 (Berkeley) 2/21/87" */
        !             8: #include <sys/disklabel.h>
        !             9: 
        !            10:        .set    MAJOR,2                 /* major("/dev/up0a") */
        !            11: 
        !            12: /*
        !            13:  * UP 1st level boot program: loads next 7.5Kbytes from
        !            14:  * boot sector of file system and sets it up to run.
        !            15:  * Always reads from drive 0.
        !            16:  */
        !            17:        .set    BOOTSIZE,15             /* size of boot in sectors */
        !            18:        .set    RELOC,0x50000
        !            19:        .set    UPBPSECT,512            /* bytes per sector */
        !            20: /* UBA registers */
        !            21:        .set    UBA_CNFGR,0             /* UBA configuration register */
        !            22:        .set    UBA_CR,4                /* UBA control register offset */
        !            23:        .set    UBA_MAP,0x800           /* UBA offset to map reg's */
        !            24: /* UP registers and bits */
        !            25:        .set    UP_cs1,0                /* control and status */
        !            26:        .set    UP_wc,2                 /* word count */
        !            27:        .set    UP_ba,4                 /* bus address */
        !            28:        .set    UP_da,6                 /* disk address */
        !            29:        .set    UP_cs2,010              /* cs2 register */
        !            30:        .set    UP_of,032               /* offset register */
        !            31:        .set    UP_dc,034               /* desired cylinder */
        !            32:        .set    UP_hr,036               /* holding register */
        !            33:        .set    UP_GO,1                 /* go bit */
        !            34:        .set    UP_PACK,022             /* pack acknowledge */
        !            35:        .set    UP_DCLR,010             /* drive clear */
        !            36:        .set    UP_PRESET,020           /* read-in-preset */
        !            37:        .set    UP_RCOM,070             /* read command */
        !            38:        .set    UPCS2_CLR,040
        !            39:        .set    UP_pRDY,7               /* position of ready bit */
        !            40:        .set    UP_pERR,15              /* position of error bit */
        !            41:        .set    UP_FMT22,010000
        !            42: 
        !            43: init:
        !            44: /* r9   UBA address */
        !            45: /* r8  UP addr */
        !            46:        .word   0                       /* entry mask for dec monitor */
        !            47:        nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
        !            48:        nop;nop;
        !            49:        movl    $MAJOR,r10              /* major("/dev/xx0a") */
        !            50:        extzv   $18,$1,r1,r9            /* get UBA number from R1 */
        !            51:        xorb2   $0x01,r9                /* complement bit */
        !            52:        insv    r9,$24,$8,r10           /* set UBA number */
        !            53:        insv    r3,$16,$8,r10           /* drive number */
        !            54:        extzv   $12,$4,r5,r4            /* get partition from r5 */
        !            55:        bicw2   $0xf000,r5              /* remove from r5 */
        !            56:        insv    r4,$8,$8,r10            /* set partition */
        !            57:        movl    r5,r11                  /* boot flags */
        !            58: 
        !            59:        movl    r2,r8                   /* boot device CSR */
        !            60:        brw     start0
        !            61: 
        !            62: /*
        !            63:  * Leave space for pack label.
        !            64:  */
        !            65: pad:
        !            66:        .space  LABELOFFSET - (pad - init)
        !            67: packlabel:
        !            68:        .space  d_end_
        !            69: 
        !            70: start0:
        !            71:        movl    physUBA[r9],r9          /* UNIBUS adaptor address */
        !            72:        movl    r3,r7                   /* unit number */
        !            73:        movl    $RELOC,sp
        !            74:        moval   init,r4
        !            75:        movc3   $end,(r4),(sp)
        !            76: /* init up, set vv in drive; if any errors, give up */
        !            77: /* probably unneeded: rom should have already done this */
        !            78:        bisw3   r7,$UPCS2_CLR,UP_cs2(r8)
        !            79:        movw    $UP_DCLR+UP_GO,UP_cs1(r8)
        !            80:        movw    $UP_PRESET+UP_GO,UP_cs1(r8)
        !            81:        movw    $UP_FMT22,UP_of(r8)
        !            82: 1:
        !            83:        movw    UP_cs1(r8),r0
        !            84:        bbc     $UP_pRDY,r0,1b
        !            85: /* relocate to high core */
        !            86: start:
        !            87:        movl    $RELOC,sp
        !            88:        moval   init,r6
        !            89:        movc3   $end,(r6),(sp)
        !            90:        jmp     *$RELOC+start2
        !            91: /* now running relocated */
        !            92:        .set    PROGSIZE,(BOOTSIZE*UPBPSECT)
        !            93: start2:
        !            94:        movw    $0,UP_dc(r8)
        !            95:        movw    $1,UP_da(r8)
        !            96:        movw    $-PROGSIZE/2,UP_wc(r8)
        !            97:        clrl    r0
        !            98: 1:
        !            99:        bisl3   $0x80000000,r0,UBA_MAP(r9)
        !           100:        addl2   $4,r9
        !           101:        aobleq  $BOOTSIZE,r0,1b
        !           102:        clrw    UP_ba(r8)
        !           103:        movw    $UP_RCOM+UP_GO,UP_cs1(r8)
        !           104: uprdy:
        !           105:        movw    UP_cs1(r8),r0
        !           106:        bbc     $UP_pRDY,r0,uprdy
        !           107: clear:
        !           108:        movl    $PROGSIZE,r3
        !           109: clrcor:
        !           110:        clrq    (r3)
        !           111:        acbl    $RELOC,$8,r3,clrcor
        !           112: /* run loaded program */
        !           113:        calls   $0,*$0
        !           114:        brw     start2
        !           115: physUBA:
        !           116:        .long   0xf30000                /* uba0 */
        !           117:        .long   0xf32000                /* uba1 */
        !           118: end:

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