projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| e2f2e851 C |
1 | /* upboot.s 6.1 83/07/29 */ |
| 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: |