projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b1078c35 KM |
1 | /* |
| 2 | * Copyright (c) 1980 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 | ||
| c7a945fd | 7 | /* "@(#)raboot.c 6.3 (Berkeley) %G%" */ |
| 9495fedd SL |
8 | |
| 9 | /* | |
| 2e6422fd SL |
10 | * UDA50 1st level boot program: loads next 7.5Kbytes from |
| 11 | * boot sector of file system and sets it up to run. | |
| 9495fedd | 12 | */ |
| 2e6422fd | 13 | .set RELOC,0x50000 |
| 006cccbe | 14 | .set BOOTLAST,15 /* last boot sector */ |
| 2e6422fd | 15 | .set RABPSECT,512 /* bytes per sector */ |
| 9495fedd SL |
16 | |
| 17 | init: | |
| 2e6422fd SL |
18 | .word 0 /* entry mask for dec monitor */ |
| 19 | nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ | |
| 20 | nop;nop; | |
| 9495fedd | 21 | start: |
| 006cccbe SL |
22 | movl r1,r7 /* UNIBUS I/O page address */ |
| 23 | movl r2,r8 /* boot device CSR */ | |
| 24 | movl r3,r9 /* unit number */ | |
| 2e6422fd SL |
25 | movl r5,r11 /* boot flags */ |
| 26 | movl $RELOC,sp | |
| 006cccbe SL |
27 | moval init,r10 |
| 28 | movc3 $end,(r10),(sp) | |
| 29 | movl r7,r1 /* UNIBUS I/O page address */ | |
| 30 | movl r8,r2 /* boot device CSR */ | |
| 31 | movl r9,r3 /* unit number */ | |
| 2e6422fd SL |
32 | jmp *$RELOC+start2 |
| 33 | /* now running relocated */ | |
| 34 | /* bring in the boot program */ | |
| 9495fedd | 35 | start2: /* running relocated */ |
| 006cccbe SL |
36 | pushr $0xffff /* BEGIN FIREWALL */ |
| 37 | movl $1,r4 /* first boot sector */ | |
| 2e6422fd | 38 | clrl r5 /* transfer address */ |
| 006cccbe | 39 | clrl -(sp) /* transfer address */ |
| 9495fedd | 40 | 1: |
| 006cccbe SL |
41 | movl r4,r8 /* requested sector # */ |
| 42 | jsb (r6) /* call ROM-based driver */ | |
| 2e6422fd SL |
43 | blbs r0,2f |
| 44 | halt /* read error */ | |
| 9495fedd | 45 | 2: |
| 006cccbe SL |
46 | addl2 $RABPSECT,r5 /* bump address */ |
| 47 | movl r5,(sp) | |
| 48 | aobleq $BOOTLAST,r4,1b | |
| 9495fedd | 49 | |
| 006cccbe | 50 | .set PROGSIZE,((BOOTLAST-1)*RABPSECT) |
| 2e6422fd | 51 | done: |
| 006cccbe SL |
52 | tstl (sp)+ /* pop address */ |
| 53 | popr $0xffff /* END FIREWALL */ | |
| 2e6422fd SL |
54 | movl $PROGSIZE,r3 |
| 55 | clrcor: | |
| 56 | clrq (r3) | |
| 57 | acbl $RELOC,$8,r3,clrcor | |
| 58 | /* start loaded program */ | |
| 59 | movl $9,r10 /* major("/dev/ra0a") */ | |
| 60 | calls $0,*$0 | |
| 61 | brw start2 | |
| 9495fedd | 62 | end: |