4.3BSD - /usr/src/sys/mdec/rlboot.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: /* "@(#)rlboot.s	7.1 (Berkeley) 6/5/86" */
   8: 
   9:         .set    MAJOR,14                /* major("/dev/rl0a") */
  10: 
  11: /*
  12:  * RL02 1st level boot program: loads next 7.5Kbytes from
  13:  * boot sector of file system and sets it up to run.
  14:  */
  15:         .set    BOOTSIZE,15             /* 15 ``sectors'' */
  16:         .set    RELOC,0x50000
  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: /* RL11 registers and bits */
  22:         .set    HL,0174400-0160000      /* address of RL11 */
  23:         .set    HLBPSECT,512            /* sector size in bytes (kludge) */
  24:         .set    HL_cs,HL+0              /* control and status */
  25:         .set    HL_ba,HL+2              /* bus address */
  26:         .set    HL_da,HL+4              /* disk address */
  27:         .set    HL_wc,HL+6              /* word count */
  28:         .set    HL_RDY,0200             /* READY  */
  29:         .set    HL_RCOM,014             /* read command */
  30:         .set    HL_SEEK,06              /* seek */
  31:         .set    HL_RESET,013            /* reset drive */
  32:         .set    HL_GSTAT,04             /* get status command */
  33:         .set    HL_pRDY,7               /* position of ready bit */
  34:         .set    HL_pERR,15              /* position of error bit */
  35: 
  36: init:
  37: /* r9   UBA address */
  38: /* r8	RL 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:         ashl    $8,r7,r7                /* shifted for HL_cs */
  55: 
  56: /* init rl11, and drive, don't check for any errors now */
  57:         movw    $HL_RESET,HL_da(r8)
  58:         bisw3   r7,$HL_GSTAT,HL_cs(r8)
  59: /* relocate to high core */
  60: start:
  61:         movl    r5,r11                  /* save boot flags */
  62:         movl    $RELOC,sp
  63:         moval   init,r6
  64:         movc3   $end,(r6),(sp)
  65:         jmp     *$RELOC+start2
  66: /* now running relocated */
  67: /* read in the boot program */
  68:         .set    PROGSIZE,(BOOTSIZE*HLBPSECT)
  69: start2:
  70:         movw    $1,HL_da(r8)                    /* seek to cylinder 0 */
  71:         bisw3   r7,$HL_SEEK,HL_cs(r8)
  72: 1:
  73:         movw    HL_cs(r8),r0
  74:         bbc     $HL_pRDY,r0,1b
  75:         bbs     $HL_pERR,r0,hlerr
  76:         /* Rl has 256 byte sectors */
  77:         movw    $2,HL_da(r8)                    /* read program */
  78:         movw    $-PROGSIZE/2,HL_wc(r8)
  79:         clrl    r0
  80: 1:
  81:         bisl3   $0x80000000,r0,UBA_MAP(r9)
  82:         addl2   $4,r9
  83:         aobleq  $BOOTSIZE,r0,1b
  84:         clrw    HL_ba(r8)
  85:         bisw3   r7,$HL_RCOM,HL_cs(r8)
  86: 1:
  87:         movw    HL_cs(r8),r0
  88:         bbc     $HL_pRDY,r0,1b
  89:         bbc     $HL_pERR,r0,done
  90: hlerr:
  91:         halt                            /* ungraceful */
  92: done:
  93:         movl    $PROGSIZE,r3
  94: clrcor:
  95:         clrq    (r3)
  96:         acbl    $RELOC,$8,r3,clrcor
  97: /* run loaded program */
  98:         calls   $0,*$0
  99:         brw     start2
 100: physUBA:
 101:         .long   0xf30000                /* uba0 */
 102:         .long   0xf32000                /* uba1 */
 103: end:

Defined functions