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.c 7.1 (Berkeley) 06/05/86" */ 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: 104