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1.1 ! root 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:
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