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1.1 ! root 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.s 7.1 (Berkeley) 6/5/86" */ ! 8: ! 9: .set MAJOR,2 /* major("/dev/up0a") */ ! 10: ! 11: /* ! 12: * UP 1st level boot program: loads next 7.5Kbytes from ! 13: * boot sector of file system and sets it up to run. ! 14: * Always reads from drive 0. ! 15: */ ! 16: .set BOOTSIZE,15 /* size of boot in sectors */ ! 17: .set RELOC,0x50000 ! 18: .set UPBPSECT,512 /* bytes per sector */ ! 19: /* UBA registers */ ! 20: .set UBA_CNFGR,0 /* UBA configuration register */ ! 21: .set UBA_CR,4 /* UBA control register offset */ ! 22: .set UBA_MAP,0x800 /* UBA offset to map reg's */ ! 23: /* UP registers and bits */ ! 24: .set UP_cs1,0 /* control and status */ ! 25: .set UP_wc,2 /* word count */ ! 26: .set UP_ba,4 /* bus address */ ! 27: .set UP_da,6 /* disk address */ ! 28: .set UP_cs2,010 /* cs2 register */ ! 29: .set UP_of,032 /* offset register */ ! 30: .set UP_dc,034 /* desired cylinder */ ! 31: .set UP_hr,036 /* holding register */ ! 32: .set UP_GO,1 /* go bit */ ! 33: .set UP_PACK,022 /* pack acknowledge */ ! 34: .set UP_DCLR,010 /* drive clear */ ! 35: .set UP_PRESET,020 /* read-in-preset */ ! 36: .set UP_RCOM,070 /* read command */ ! 37: .set UPCS2_CLR,040 ! 38: .set UP_pRDY,7 /* position of ready bit */ ! 39: .set UP_pERR,15 /* position of error bit */ ! 40: .set UP_FMT22,010000 ! 41: ! 42: init: ! 43: /* r9 UBA address */ ! 44: /* r8 UP addr */ ! 45: .word 0 /* entry mask for dec monitor */ ! 46: nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ ! 47: nop;nop; ! 48: movl $MAJOR,r10 /* major("/dev/xx0a") */ ! 49: extzv $18,$1,r1,r9 /* get UBA number from R1 */ ! 50: xorb2 $0x01,r9 /* complement bit */ ! 51: insv r9,$24,$8,r10 /* set UBA number */ ! 52: insv r3,$16,$8,r10 /* drive number */ ! 53: extzv $12,$4,r5,r4 /* get partition from r5 */ ! 54: bicw2 $0xf000,r5 /* remove from r5 */ ! 55: insv r4,$8,$8,r10 /* set partition */ ! 56: movl r5,r11 /* boot flags */ ! 57: movl physUBA[r9],r9 /* UNIBUS adaptor address */ ! 58: movl r2,r8 /* boot device CSR */ ! 59: movl r3,r7 /* unit number */ ! 60: ! 61: movl $RELOC,sp ! 62: moval init,r4 ! 63: movc3 $end,(r4),(sp) ! 64: movl r9,r1 /* UNIBUS I/O page address */ ! 65: movl r8,r2 /* boot device CSR */ ! 66: movl r7,r3 /* unit number */ ! 67: /* init up, set vv in drive; if any errors, give up */ ! 68: bisw3 r7,$UPCS2_CLR,UP_cs2(r8) ! 69: movw $UP_DCLR+UP_GO,UP_cs1(r8) ! 70: movw $UP_PRESET+UP_GO,UP_cs1(r8) ! 71: movw $UP_FMT22,UP_of(r8) ! 72: 1: ! 73: movw UP_cs1(r8),r0 ! 74: bbc $UP_pRDY,r0,1b ! 75: /* relocate to high core */ ! 76: start: ! 77: movl r5,r11 /* boot flags */ ! 78: movl $RELOC,sp ! 79: moval init,r6 ! 80: movc3 $end,(r6),(sp) ! 81: jmp *$RELOC+start2 ! 82: /* now running relocated */ ! 83: .set PROGSIZE,(BOOTSIZE*UPBPSECT) ! 84: start2: ! 85: movw $0,UP_dc(r8) ! 86: movw $1,UP_da(r8) ! 87: movw $-PROGSIZE/2,UP_wc(r8) ! 88: clrl r0 ! 89: 1: ! 90: bisl3 $0x80000000,r0,UBA_MAP(r9) ! 91: addl2 $4,r9 ! 92: aobleq $BOOTSIZE,r0,1b ! 93: clrw UP_ba(r8) ! 94: movw $UP_RCOM+UP_GO,UP_cs1(r8) ! 95: uprdy: ! 96: movw UP_cs1(r8),r0 ! 97: bbc $UP_pRDY,r0,uprdy ! 98: clear: ! 99: movl $PROGSIZE,r3 ! 100: clrcor: ! 101: clrq (r3) ! 102: acbl $RELOC,$8,r3,clrcor ! 103: /* run loaded program */ ! 104: calls $0,*$0 ! 105: brw start2 ! 106: physUBA: ! 107: .long 0xf30000 /* uba0 */ ! 108: .long 0xf32000 /* uba1 */ ! 109: end:
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