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 /* "@(#)upboot.c 7.3 (Berkeley) 02/21/87" */ 8 #include <sys/disklabel.h> 9 10 .set MAJOR,2 /* major("/dev/up0a") */ 11 12 /* 13 * UP 1st level boot program: loads next 7.5Kbytes from 14 * boot sector of file system and sets it up to run. 15 * Always reads from drive 0. 16 */ 17 .set BOOTSIZE,15 /* size of boot in sectors */ 18 .set RELOC,0x50000 19 .set UPBPSECT,512 /* bytes per sector */ 20 /* UBA registers */ 21 .set UBA_CNFGR,0 /* UBA configuration register */ 22 .set UBA_CR,4 /* UBA control register offset */ 23 .set UBA_MAP,0x800 /* UBA offset to map reg's */ 24 /* UP registers and bits */ 25 .set UP_cs1,0 /* control and status */ 26 .set UP_wc,2 /* word count */ 27 .set UP_ba,4 /* bus address */ 28 .set UP_da,6 /* disk address */ 29 .set UP_cs2,010 /* cs2 register */ 30 .set UP_of,032 /* offset register */ 31 .set UP_dc,034 /* desired cylinder */ 32 .set UP_hr,036 /* holding register */ 33 .set UP_GO,1 /* go bit */ 34 .set UP_PACK,022 /* pack acknowledge */ 35 .set UP_DCLR,010 /* drive clear */ 36 .set UP_PRESET,020 /* read-in-preset */ 37 .set UP_RCOM,070 /* read command */ 38 .set UPCS2_CLR,040 39 .set UP_pRDY,7 /* position of ready bit */ 40 .set UP_pERR,15 /* position of error bit */ 41 .set UP_FMT22,010000 42 43 init: 44 /* r9 UBA address */ 45 /* r8 UP addr */ 46 .word 0 /* entry mask for dec monitor */ 47 nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ 48 nop;nop; 49 movl $MAJOR,r10 /* major("/dev/xx0a") */ 50 extzv $18,$1,r1,r9 /* get UBA number from R1 */ 51 xorb2 $0x01,r9 /* complement bit */ 52 insv r9,$24,$8,r10 /* set UBA number */ 53 insv r3,$16,$8,r10 /* drive number */ 54 extzv $12,$4,r5,r4 /* get partition from r5 */ 55 bicw2 $0xf000,r5 /* remove from r5 */ 56 insv r4,$8,$8,r10 /* set partition */ 57 movl r5,r11 /* boot flags */ 58 59 movl r2,r8 /* boot device CSR */ 60 brw start0 61 62 /* 63 * Leave space for pack label. 64 */ 65 pad: 66 .space LABELOFFSET - (pad - init) 67 packlabel: 68 .space d_end_ 69 70 start0: 71 movl physUBA[r9],r9 /* UNIBUS adaptor address */ 72 movl r3,r7 /* unit number */ 73 movl $RELOC,sp 74 moval init,r4 75 movc3 $end,(r4),(sp) 76 /* init up, set vv in drive; if any errors, give up */ 77 /* probably unneeded: rom should have already done this */ 78 bisw3 r7,$UPCS2_CLR,UP_cs2(r8) 79 movw $UP_DCLR+UP_GO,UP_cs1(r8) 80 movw $UP_PRESET+UP_GO,UP_cs1(r8) 81 movw $UP_FMT22,UP_of(r8) 82 1: 83 movw UP_cs1(r8),r0 84 bbc $UP_pRDY,r0,1b 85 /* relocate to high core */ 86 start: 87 movl $RELOC,sp 88 moval init,r6 89 movc3 $end,(r6),(sp) 90 jmp *$RELOC+start2 91 /* now running relocated */ 92 .set PROGSIZE,(BOOTSIZE*UPBPSECT) 93 start2: 94 movw $0,UP_dc(r8) 95 movw $1,UP_da(r8) 96 movw $-PROGSIZE/2,UP_wc(r8) 97 clrl r0 98 1: 99 bisl3 $0x80000000,r0,UBA_MAP(r9) 100 addl2 $4,r9 101 aobleq $BOOTSIZE,r0,1b 102 clrw UP_ba(r8) 103 movw $UP_RCOM+UP_GO,UP_cs1(r8) 104 uprdy: 105 movw UP_cs1(r8),r0 106 bbc $UP_pRDY,r0,uprdy 107 clear: 108 movl $PROGSIZE,r3 109 clrcor: 110 clrq (r3) 111 acbl $RELOC,$8,r3,clrcor 112 /* run loaded program */ 113 calls $0,*$0 114 brw start2 115 physUBA: 116 .long 0xf30000 /* uba0 */ 117 .long 0xf32000 /* uba1 */ 118 end: 119