1 /* upboot.c 4.1 83/02/16 */ 2 3 /* 4 * UP 1st level boot program: loads next 7.5Kbytes from 5 * boot sector of file system and sets it up to run. 6 * Always reads from drive 0. 7 */ 8 .set BOOTSIZE,15 /* size of boot in sectors */ 9 .set RELOC,0x50000 10 .set UPBPSECT,512 /* bytes per sector */ 11 .set SID,62 /* system ID register */ 12 /* UBA registers */ 13 .set UBA_CNFGR,0 /* UBA configuration register */ 14 .set UBA_CR,4 /* UBA control register offset */ 15 .set UBA_MAP,0x800 /* UBA offset to map reg's */ 16 .set UBAinit,1 /* UBA init bit in UBA control reg */ 17 .set pUBIC,16 /* Unibus init complete */ 18 /* UP registers and bits */ 19 .set UP,0176700-0160000 /* address of UP controller */ 20 .set UP_cs1,UP+0 /* control and status */ 21 .set UP_wc,UP+2 /* word count */ 22 .set UP_ba,UP+4 /* bus address */ 23 .set UP_da,UP+6 /* disk address */ 24 .set UP_cs2,UP+010 /* cs2 register */ 25 .set UP_of,UP+032 /* offset register */ 26 .set UP_dc,UP+034 /* desired cylinder */ 27 .set UP_hr,UP+036 /* holding register */ 28 .set UP_GO,1 /* go bit */ 29 .set UP_PACK,022 /* pack acknowledge */ 30 .set UP_DCLR,010 /* drive clear */ 31 .set UP_PRESET,020 /* read-in-preset */ 32 .set UP_RCOM,070 /* read command */ 33 .set UPCS2_CLR,040 34 .set UP_pRDY,7 /* position of ready bit */ 35 .set UP_pERR,15 /* position of error bit */ 36 .set UP_FMT22,010000 37 38 init: 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 /* get cpu type and find the first uba */ 43 mfpr $SID,r0 44 extzv $24,$8,r0,r0 /* get cpu type */ 45 ashl $2,r0,r1 46 movab physUBA,r2 /* get physUBA[cpu] */ 47 addl2 r1,r2 48 movl (r2),r9 49 movab physUMEM,r2 /* get physUMEM[cpu] */ 50 addl2 r1,r2 51 movl (r2),r10 52 /* if 780, init uba */ 53 cmpl r0,$1 54 bneq 2f 55 movl $UBAinit,UBA_CR(r9) 56 1: 57 bbc $pUBIC,UBA_CNFGR(r9),1b 58 2: 59 movl $5000000,r0 60 1: 61 sobgtr r0,1b 62 /* init up, set vv in drive 0; if any errors, give up */ 63 movw $UPCS2_CLR,UP_cs2(r10) 64 movw $UP_DCLR+UP_GO,UP_cs1(r10) 65 movw $UP_PRESET+UP_GO,UP_cs1(r10) 66 movw $UP_FMT22,UP_of(r10) 67 1: 68 movw UP_cs1(r10),r0 69 bbc $UP_pRDY,r0,1b 70 /* relocate to high core */ 71 start: 72 movl r5,r11 /* boot flags */ 73 movl $RELOC,sp 74 moval init,r6 75 movc3 $end,(r6),(sp) 76 jmp *$RELOC+start2 77 /* now running relocated */ 78 .set PROGSIZE,(BOOTSIZE*UPBPSECT) 79 start2: 80 movw $0,UP_dc(r10) 81 movw $1,UP_da(r10) 82 movw $-PROGSIZE/2,UP_wc(r10) 83 clrl r0 84 1: 85 bisl3 $0x80000000,r0,UBA_MAP(r9) 86 addl2 $4,r9 87 aobleq $BOOTSIZE,r0,1b 88 clrw UP_ba(r10) 89 movw $UP_RCOM+UP_GO,UP_cs1(r10) 90 uprdy: 91 movw UP_cs1(r10),r0 92 bbc $UP_pRDY,r0,uprdy 93 clear: 94 movl $PROGSIZE,r3 95 clrcor: 96 clrq (r3) 97 acbl $RELOC,$8,r3,clrcor 98 /* run loaded program */ 99 movl $2,r10 /* major("/dev/up0a") */ 100 calls $0,*$0 101 brw start2 102 physUBA: 103 .long 0 104 .long 0x20006000 /* 11/780 */ 105 .long 0xf30000 /* 11/750 */ 106 .long 0xf26000 /* 11/730 */ 107 physUMEM: 108 .long 0 109 .long 0x2013e000 /* 11/780 */ 110 .long 0xffe000 /* 11/750 */ 111 .long 0xffe000 /* 11/730 */ 112 end: 113