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 7.3 (Berkeley) 02/21/87" */ 8 #include <sys/disklabel.h> 9 10 .set MAJOR,14 /* major("/dev/rl0a") */ 11 12 /* 13 * RL02 1st level boot program: loads next 7.5Kbytes from 14 * boot sector of file system and sets it up to run. 15 */ 16 .set BOOTSIZE,15 /* 15 ``sectors'' */ 17 .set RELOC,0x50000 18 /* UBA registers */ 19 .set UBA_CNFGR,0 /* UBA configuration register */ 20 .set UBA_CR,4 /* UBA control register offset */ 21 .set UBA_MAP,0x800 /* UBA offset to map reg's */ 22 /* RL11 registers and bits */ 23 .set HL,0174400-0160000 /* address of RL11 */ 24 .set HLBPSECT,512 /* sector size in bytes (kludge) */ 25 .set HL_cs,HL+0 /* control and status */ 26 .set HL_ba,HL+2 /* bus address */ 27 .set HL_da,HL+4 /* disk address */ 28 .set HL_wc,HL+6 /* word count */ 29 .set HL_RDY,0200 /* READY */ 30 .set HL_RCOM,014 /* read command */ 31 .set HL_SEEK,06 /* seek */ 32 .set HL_RESET,013 /* reset drive */ 33 .set HL_GSTAT,04 /* get status command */ 34 .set HL_pRDY,7 /* position of ready bit */ 35 .set HL_pERR,15 /* position of error bit */ 36 37 init: 38 /* r9 UBA address */ 39 /* r8 RL addr */ 40 .word 0 /* entry mask for dec monitor */ 41 nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ 42 nop;nop; 43 cvtbl $MAJOR,r10 /* major("/dev/xx0a") */ 44 extzv $18,$1,r1,r9 /* get UBA number from R1 */ 45 xorb2 $0x01,r9 /* complement bit */ 46 insv r9,$24,$8,r10 /* set UBA number */ 47 insv r3,$16,$8,r10 /* drive number */ 48 extzv $12,$4,r5,r4 /* get partition from r5 */ 49 bicw2 $0xf000,r5 /* remove from r5 */ 50 insv r4,$8,$8,r10 /* set partition */ 51 movl r5,r11 /* boot flags */ 52 53 movl r2,r8 /* boot device CSR */ 54 brw start0 55 56 /* 57 * Leave space for pack label. 58 */ 59 pad: 60 .space LABELOFFSET - (pad - init) 61 packlabel: 62 .space d_end_ 63 64 start0: 65 movl physUBA[r9],r9 /* UNIBUS adaptor address */ 66 ashl $8,r3,r7 /* unit number, shifted for HL_cs */ 67 68 /* init rl11, and drive, don't check for any errors now */ 69 movw $HL_RESET,HL_da(r8) 70 bisw3 r7,$HL_GSTAT,HL_cs(r8) 71 /* relocate to high core */ 72 start: 73 movl $RELOC,sp 74 moval init,r6 75 movc3 $end,(r6),(sp) 76 jmp *$RELOC+start2 77 /* now running relocated */ 78 /* read in the boot program */ 79 .set PROGSIZE,(BOOTSIZE*HLBPSECT) 80 start2: 81 movw $1,HL_da(r8) /* seek to cylinder 0 */ 82 bisw3 r7,$HL_SEEK,HL_cs(r8) 83 1: 84 movw HL_cs(r8),r0 85 bbc $HL_pRDY,r0,1b 86 bbs $HL_pERR,r0,hlerr 87 /* Rl has 256 byte sectors */ 88 movw $2,HL_da(r8) /* read program */ 89 movw $-PROGSIZE/2,HL_wc(r8) 90 clrl r0 91 1: 92 bisl3 $0x80000000,r0,UBA_MAP(r9) 93 addl2 $4,r9 94 aobleq $BOOTSIZE,r0,1b 95 clrw HL_ba(r8) 96 bisw3 r7,$HL_RCOM,HL_cs(r8) 97 1: 98 movw HL_cs(r8),r0 99 bbc $HL_pRDY,r0,1b 100 bbc $HL_pERR,r0,done 101 hlerr: 102 halt /* ungraceful */ 103 done: 104 movl $PROGSIZE,r3 105 clrcor: 106 clrq (r3) 107 acbl $RELOC,$8,r3,clrcor 108 /* run loaded program */ 109 calls $0,*$0 110 brw start2 111 physUBA: 112 .long 0xf30000 /* uba0 */ 113 .long 0xf32000 /* uba1 */ 114 end: 115