4.3BSD - /usr/src/sys/mdec/hkboot.s

   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: /* @(#)hkboot.s	7.1 (Berkeley) 6/5/86 */
   8: 
   9:         .set    MAJOR,3         /* major("/dev/hk0a") */
  10: 
  11: /*
  12:  * RK07 1st level boot program: loads next 7.5Kbytes from
  13:  * boot sector of file system and sets it up to run.
  14:  */
  15:         .set    RELOC,0x50000
  16:         .set    BOOTSIZE,15             /* size of boot in sectors */
  17: /* UBA registers */
  18:         .set    UBA_CNFGR,0             /* UBA configuration register */
  19:         .set    UBA_CR,4                /* UBA control register offset */
  20:         .set    UBA_MAP,0x800           /* UBA offset to map reg's */
  21: /* RK611 registers and bits */
  22:         .set    HK_cs1,0                /* control and status */
  23:         .set    HK_wc,2                 /* word count */
  24:         .set    HK_ba,4                 /* bus address */
  25:         .set    HK_da,6                 /* disk address */
  26:         .set    HK_cs2,8                /* control and status */
  27:         .set    HK_dc,020               /* desired cylinder */
  28:         .set    HKBPSECT,512            /* bytes per sector */
  29:         .set    HK_GO,1                 /* go bit */
  30:         .set    HK_PACK,2               /* pack acknowledge */
  31:         .set    HK_RCOM,020             /* read command */
  32:         .set    HK_SEL7,02000           /* select RK07 disk */
  33:         .set    HK_pRDY,7               /* position of ready bit */
  34:         .set    HK_pERR,15              /* position of error bit */
  35: 
  36: init:
  37: /* r9	UBA address */
  38: /* r8	HK addr */
  39:         .word   0                       /* entry mask for dec monitor */
  40:         nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
  41:         nop;nop;
  42:         movl    $MAJOR,r10              /* major("/dev/xx0a") */
  43:         extzv   $18,$1,r1,r9            /* get UBA number from R1 */
  44:         xorb2   $0x01,r9                /* complement bit */
  45:         insv    r9,$24,$8,r10           /* set UBA number */
  46:         insv    r3,$16,$8,r10           /* drive number */
  47:         extzv   $12,$4,r5,r4            /* get partition from r5 */
  48:         bicw2   $0xf000,r5              /* remove from r5 */
  49:         insv    r4,$8,$8,r10            /* set partition */
  50:         movl    r5,r11                  /* boot flags */
  51:         movl    physUBA[r9],r9          /* UNIBUS adaptor address */
  52:         movl    r2,r8                   /* boot device CSR */
  53:         movl    r3,r7                   /* unit number */
  54: 
  55: /* select unit, init rk611, set vv in drive; if any errors, give up */
  56:         movw    r7,HK_cs2(r8)
  57:         movw    $HK_SEL7+HK_GO,HK_cs1(r8)
  58: 1:
  59:         movw    HK_cs1(r8),r0
  60:         bbc     $HK_pRDY,r0,1b
  61:         bbs     $HK_pERR,r0,9f
  62:         movw    $HK_SEL7+HK_PACK+HK_GO,HK_cs1(r8)
  63: 1:
  64:         movw    HK_cs1(r8),r0
  65:         bbc     $HK_pRDY,r0,1b
  66:         bbc     $HK_pERR,r0,start
  67: 9:
  68:         halt
  69: /* relocate to high core */
  70: start:
  71:         movl    r5,r11                  /* boot flags */
  72:         movl    $RELOC,sp
  73:         moval   init,r6
  74:         movc3   $end,(r6),(sp)
  75:         jmp     *$RELOC+start2
  76: /* now running relocated */
  77: /* bring in the boot program */
  78:         .set    PROGSIZE,(BOOTSIZE*HKBPSECT)
  79: start2:
  80:         movw    $0,HK_dc(r8)
  81:         movw    $1,HK_da(r8)
  82:         movw    $-PROGSIZE/2,HK_wc(r8)
  83:         clrl    r0
  84: 1:
  85: #	bisl3 $0x80000000,r0,UBA_MAP(r9)
  86: #	addl2 $4,r9
  87: #	aobleq        $BOOTSIZE,r0,1b
  88:         clrw    HK_ba(r8)
  89:         movw    $HK_SEL7+HK_RCOM+HK_GO,HK_cs1(r8)
  90: hkrdy:
  91:         movw    HK_cs1(r8),r0
  92:         bbc     $HK_pRDY,r0,hkrdy
  93:         bbs     $HK_pERR,r0,hkerr
  94:         brw     done
  95: hkerr:
  96:         halt                    /* ungraceful */
  97: done:
  98:         movl    $PROGSIZE,r3
  99: clrcor:
 100:         clrq    (r3)
 101:         acbl    $RELOC,$8,r3,clrcor
 102: /* start loaded program */
 103:         calls   $0,*$0
 104:         brw     start2
 105: physUBA:
 106:         .long   0xf30000                /* uba0 */
 107:         .long   0xf32000                /* uba1 */
 108: end:

Defined functions