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 7 /* "@(#)upboot.c 6.4 (Berkeley) 03/14/86" */ 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: 110