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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: /* "@(#)rlboot.s 7.1 (Berkeley) 6/5/86" */ ! 8: ! 9: .set MAJOR,14 /* major("/dev/rl0a") */ ! 10: ! 11: /* ! 12: * RL02 1st level boot program: loads next 7.5Kbytes from ! 13: * boot sector of file system and sets it up to run. ! 14: */ ! 15: .set BOOTSIZE,15 /* 15 ``sectors'' */ ! 16: .set RELOC,0x50000 ! 17: /* UBA registers */ ! 18: .set UBA_CNFGR,0 /* UBA configuration register */ ! 19: .set UBA_CR,4 /* UBA control register offset */ ! 20: .set UBA_MAP,0x800 /* UBA offset to map reg's */ ! 21: /* RL11 registers and bits */ ! 22: .set HL,0174400-0160000 /* address of RL11 */ ! 23: .set HLBPSECT,512 /* sector size in bytes (kludge) */ ! 24: .set HL_cs,HL+0 /* control and status */ ! 25: .set HL_ba,HL+2 /* bus address */ ! 26: .set HL_da,HL+4 /* disk address */ ! 27: .set HL_wc,HL+6 /* word count */ ! 28: .set HL_RDY,0200 /* READY */ ! 29: .set HL_RCOM,014 /* read command */ ! 30: .set HL_SEEK,06 /* seek */ ! 31: .set HL_RESET,013 /* reset drive */ ! 32: .set HL_GSTAT,04 /* get status command */ ! 33: .set HL_pRDY,7 /* position of ready bit */ ! 34: .set HL_pERR,15 /* position of error bit */ ! 35: ! 36: init: ! 37: /* r9 UBA address */ ! 38: /* r8 RL addr */ ! 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: movl $MAJOR,r10 /* major("/dev/xx0a") */ ! 43: extzv $18,$1,r1,r9 /* get UBA number from R1 */ ! 44: xorb2 $0x01,r9 /* complement bit */ ! 45: insv r9,$24,$8,r10 /* set UBA number */ ! 46: insv r3,$16,$8,r10 /* drive number */ ! 47: extzv $12,$4,r5,r4 /* get partition from r5 */ ! 48: bicw2 $0xf000,r5 /* remove from r5 */ ! 49: insv r4,$8,$8,r10 /* set partition */ ! 50: movl r5,r11 /* boot flags */ ! 51: movl physUBA[r9],r9 /* UNIBUS adaptor address */ ! 52: movl r2,r8 /* boot device CSR */ ! 53: movl r3,r7 /* unit number */ ! 54: ashl $8,r7,r7 /* shifted for HL_cs */ ! 55: ! 56: /* init rl11, and drive, don't check for any errors now */ ! 57: movw $HL_RESET,HL_da(r8) ! 58: bisw3 r7,$HL_GSTAT,HL_cs(r8) ! 59: /* relocate to high core */ ! 60: start: ! 61: movl r5,r11 /* save boot flags */ ! 62: movl $RELOC,sp ! 63: moval init,r6 ! 64: movc3 $end,(r6),(sp) ! 65: jmp *$RELOC+start2 ! 66: /* now running relocated */ ! 67: /* read in the boot program */ ! 68: .set PROGSIZE,(BOOTSIZE*HLBPSECT) ! 69: start2: ! 70: movw $1,HL_da(r8) /* seek to cylinder 0 */ ! 71: bisw3 r7,$HL_SEEK,HL_cs(r8) ! 72: 1: ! 73: movw HL_cs(r8),r0 ! 74: bbc $HL_pRDY,r0,1b ! 75: bbs $HL_pERR,r0,hlerr ! 76: /* Rl has 256 byte sectors */ ! 77: movw $2,HL_da(r8) /* read program */ ! 78: movw $-PROGSIZE/2,HL_wc(r8) ! 79: clrl r0 ! 80: 1: ! 81: bisl3 $0x80000000,r0,UBA_MAP(r9) ! 82: addl2 $4,r9 ! 83: aobleq $BOOTSIZE,r0,1b ! 84: clrw HL_ba(r8) ! 85: bisw3 r7,$HL_RCOM,HL_cs(r8) ! 86: 1: ! 87: movw HL_cs(r8),r0 ! 88: bbc $HL_pRDY,r0,1b ! 89: bbc $HL_pERR,r0,done ! 90: hlerr: ! 91: halt /* ungraceful */ ! 92: done: ! 93: movl $PROGSIZE,r3 ! 94: clrcor: ! 95: clrq (r3) ! 96: acbl $RELOC,$8,r3,clrcor ! 97: /* run loaded program */ ! 98: calls $0,*$0 ! 99: brw start2 ! 100: physUBA: ! 101: .long 0xf30000 /* uba0 */ ! 102: .long 0xf32000 /* uba1 */ ! 103: end:
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