usr/src/sys/vax/mdec/rlboot.c

/*
 * Copyright (c) 1980, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

/* "@(#)rlboot.c        7.3 (Berkeley) %G%" */
#include <sys/disklabel.h>

        .set    MAJOR,14                /* major("/dev/rl0a") */

/*
 * RL02 1st level boot program: loads next 7.5Kbytes from
 * boot sector of file system and sets it up to run.
 */
        .set    BOOTSIZE,15             /* 15 ``sectors'' */
        .set    RELOC,0x50000
/* UBA registers */
        .set    UBA_CNFGR,0             /* UBA configuration register */
        .set    UBA_CR,4                /* UBA control register offset */
        .set    UBA_MAP,0x800           /* UBA offset to map reg's */
/* RL11 registers and bits */
        .set    HL,0174400-0160000      /* address of RL11 */
        .set    HLBPSECT,512            /* sector size in bytes (kludge) */
        .set    HL_cs,HL+0              /* control and status */
        .set    HL_ba,HL+2              /* bus address */
        .set    HL_da,HL+4              /* disk address */
        .set    HL_wc,HL+6              /* word count */
        .set    HL_RDY,0200             /* READY  */
        .set    HL_RCOM,014             /* read command */
        .set    HL_SEEK,06              /* seek */
        .set    HL_RESET,013            /* reset drive */
        .set    HL_GSTAT,04             /* get status command */
        .set    HL_pRDY,7               /* position of ready bit */
        .set    HL_pERR,15              /* position of error bit */

init:
/* r9   UBA address */
/* r8   RL addr */
        .word   0                       /* entry mask for dec monitor */
        nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
        nop;nop;
        cvtbl   $MAJOR,r10              /* major("/dev/xx0a") */
        extzv   $18,$1,r1,r9            /* get UBA number from R1 */
        xorb2   $0x01,r9                /* complement bit */
        insv    r9,$24,$8,r10           /* set UBA number */
        insv    r3,$16,$8,r10           /* drive number */
        extzv   $12,$4,r5,r4            /* get partition from r5 */
        bicw2   $0xf000,r5              /* remove from r5 */
        insv    r4,$8,$8,r10            /* set partition */
        movl    r5,r11                  /* boot flags */

        movl    r2,r8                   /* boot device CSR */
        brw     start0

/*
 * Leave space for pack label.
 */
pad:
        .space  LABELOFFSET - (pad - init)
packlabel:
        .space  d_end_

start0:
        movl    physUBA[r9],r9          /* UNIBUS adaptor address */
        ashl    $8,r3,r7                /* unit number, shifted for HL_cs */

/* init rl11, and drive, don't check for any errors now */
        movw    $HL_RESET,HL_da(r8)
        bisw3   r7,$HL_GSTAT,HL_cs(r8)
/* relocate to high core */
start:
        movl    $RELOC,sp
        moval   init,r6
        movc3   $end,(r6),(sp)
        jmp     *$RELOC+start2
/* now running relocated */
/* read in the boot program */
        .set    PROGSIZE,(BOOTSIZE*HLBPSECT)
start2:
        movw    $1,HL_da(r8)                    /* seek to cylinder 0 */
        bisw3   r7,$HL_SEEK,HL_cs(r8)
1:
        movw    HL_cs(r8),r0
        bbc     $HL_pRDY,r0,1b
        bbs     $HL_pERR,r0,hlerr
        /* Rl has 256 byte sectors */
        movw    $2,HL_da(r8)                    /* read program */
        movw    $-PROGSIZE/2,HL_wc(r8)
        clrl    r0
1:
        bisl3   $0x80000000,r0,UBA_MAP(r9)
        addl2   $4,r9
        aobleq  $BOOTSIZE,r0,1b
        clrw    HL_ba(r8)
        bisw3   r7,$HL_RCOM,HL_cs(r8)
1:
        movw    HL_cs(r8),r0
        bbc     $HL_pRDY,r0,1b
        bbc     $HL_pERR,r0,done
hlerr:
        halt                            /* ungraceful */
done:
        movl    $PROGSIZE,r3
clrcor:
        clrq    (r3)
        acbl    $RELOC,$8,r3,clrcor
/* run loaded program */
        calls   $0,*$0
        brw     start2
physUBA:
        .long   0xf30000                /* uba0 */
        .long   0xf32000                /* uba1 */
end: