4.3BSD - /usr/src/sys/mdec/upboot.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: /* "@(#)upboot.s	7.1 (Berkeley) 6/5/86" */
   8: 
   9:         .set    MAJOR,2                 /* major("/dev/up0a") */
  10: 
  11: /*
  12:  * UP 1st level boot program: loads next 7.5Kbytes from
  13:  * boot sector of file system and sets it up to run.
  14:  * Always reads from drive 0.
  15:  */
  16:         .set    BOOTSIZE,15             /* size of boot in sectors */
  17:         .set    RELOC,0x50000
  18:         .set    UPBPSECT,512            /* bytes per sector */
  19: /* UBA registers */
  20:         .set    UBA_CNFGR,0             /* UBA configuration register */
  21:         .set    UBA_CR,4                /* UBA control register offset */
  22:         .set    UBA_MAP,0x800           /* UBA offset to map reg's */
  23: /* UP registers and bits */
  24:         .set    UP_cs1,0                /* control and status */
  25:         .set    UP_wc,2                 /* word count */
  26:         .set    UP_ba,4                 /* bus address */
  27:         .set    UP_da,6                 /* disk address */
  28:         .set    UP_cs2,010              /* cs2 register */
  29:         .set    UP_of,032               /* offset register */
  30:         .set    UP_dc,034               /* desired cylinder */
  31:         .set    UP_hr,036               /* holding register */
  32:         .set    UP_GO,1                 /* go bit */
  33:         .set    UP_PACK,022             /* pack acknowledge */
  34:         .set    UP_DCLR,010             /* drive clear */
  35:         .set    UP_PRESET,020           /* read-in-preset */
  36:         .set    UP_RCOM,070             /* read command */
  37:         .set    UPCS2_CLR,040
  38:         .set    UP_pRDY,7               /* position of ready bit */
  39:         .set    UP_pERR,15              /* position of error bit */
  40:         .set    UP_FMT22,010000
  41: 
  42: init:
  43: /* r9   UBA address */
  44: /* r8	UP addr */
  45:         .word   0                       /* entry mask for dec monitor */
  46:         nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */
  47:         nop;nop;
  48:         movl    $MAJOR,r10              /* major("/dev/xx0a") */
  49:         extzv   $18,$1,r1,r9            /* get UBA number from R1 */
  50:         xorb2   $0x01,r9                /* complement bit */
  51:         insv    r9,$24,$8,r10           /* set UBA number */
  52:         insv    r3,$16,$8,r10           /* drive number */
  53:         extzv   $12,$4,r5,r4            /* get partition from r5 */
  54:         bicw2   $0xf000,r5              /* remove from r5 */
  55:         insv    r4,$8,$8,r10            /* set partition */
  56:         movl    r5,r11                  /* boot flags */
  57:         movl    physUBA[r9],r9          /* UNIBUS adaptor address */
  58:         movl    r2,r8                   /* boot device CSR */
  59:         movl    r3,r7                   /* unit number */
  60: 
  61:         movl    $RELOC,sp
  62:         moval   init,r4
  63:         movc3   $end,(r4),(sp)
  64:         movl    r9,r1                   /* UNIBUS I/O page address */
  65:         movl    r8,r2                   /* boot device CSR */
  66:         movl    r7,r3                   /* unit number */
  67: /* init up, set vv in drive; if any errors, give up */
  68:         bisw3   r7,$UPCS2_CLR,UP_cs2(r8)
  69:         movw    $UP_DCLR+UP_GO,UP_cs1(r8)
  70:         movw    $UP_PRESET+UP_GO,UP_cs1(r8)
  71:         movw    $UP_FMT22,UP_of(r8)
  72: 1:
  73:         movw    UP_cs1(r8),r0
  74:         bbc     $UP_pRDY,r0,1b
  75: /* relocate to high core */
  76: start:
  77:         movl    r5,r11                  /* boot flags */
  78:         movl    $RELOC,sp
  79:         moval   init,r6
  80:         movc3   $end,(r6),(sp)
  81:         jmp     *$RELOC+start2
  82: /* now running relocated */
  83:         .set    PROGSIZE,(BOOTSIZE*UPBPSECT)
  84: start2:
  85:         movw    $0,UP_dc(r8)
  86:         movw    $1,UP_da(r8)
  87:         movw    $-PROGSIZE/2,UP_wc(r8)
  88:         clrl    r0
  89: 1:
  90:         bisl3   $0x80000000,r0,UBA_MAP(r9)
  91:         addl2   $4,r9
  92:         aobleq  $BOOTSIZE,r0,1b
  93:         clrw    UP_ba(r8)
  94:         movw    $UP_RCOM+UP_GO,UP_cs1(r8)
  95: uprdy:
  96:         movw    UP_cs1(r8),r0
  97:         bbc     $UP_pRDY,r0,uprdy
  98: clear:
  99:         movl    $PROGSIZE,r3
 100: clrcor:
 101:         clrq    (r3)
 102:         acbl    $RELOC,$8,r3,clrcor
 103: /* run loaded program */
 104:         calls   $0,*$0
 105:         brw     start2
 106: physUBA:
 107:         .long   0xf30000                /* uba0 */
 108:         .long   0xf32000                /* uba1 */
 109: end:

Defined functions