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 /* "@(#)hpboot.c 6.4 (Berkeley) 03/13/86" */ 8 9 10 #define PARTITION /* Partition is in bits 12 to 15 of R5 11 12 /* 13 * RP??/RM?? 1st level boot program: loads next 7.5Kbytes from 14 * boot sectors of file system and sets it up to run. 15 * Reads from the controller and drive passed in from the boot 16 * rom. 17 * R1: address of the boot device's adapter 18 * R2: controller number of the boot device 19 * R3: unit number of the boot device 20 * R5: software boot control flags 21 * R6: address of driver subroutine from ROM 22 * SP: base address of usable memory + 0x200 23 */ 24 .set BOOTSIZE,15 /* size of boot in sectors */ 25 .set RELOC,0x70000 26 /* MBA registers */ 27 .set M_cr,4 /* MBA control reg */ 28 .set M_sr,8 /* MBA status reg */ 29 .set M_var,12 /* MBA virt addr reg */ 30 .set M_bc,16 /* MBA byte count reg */ 31 .set M_map,0x800 /* start of MBA map reg's */ 32 .set MBAinit,1 /* MBA init bit in MBA control reg */ 33 .set MBABUSY,0x80000000 /* MBA SR: data transfer busy */ 34 .set pMBABUSY,31 /* bit position of MBABUSY */ 35 /* Drive information */ 36 .set RP,0x400 /* start of drive registers */ 37 .set RPDR,0x80 /* offset per drive unit */ 38 .set RP_cr,0 /* control status register */ 39 .set RP_sr,4 /* drive status reg */ 40 .set RP_stk,0x14 /* desired track/sector reg */ 41 .set RP_dt,0x18 /* drive type reg */ 42 .set RP_off,0x24 /* RP offset reg */ 43 .set RP_cyl,0x28 /* desired cyl reg */ 44 .set RPBPSECT,512 /* bytes per sector */ 45 /* RP?? function codes, status bits */ 46 .set RP_GO,1 /* go */ 47 .set RP_RED,070 /* read */ 48 .set RP_DC,010 /* drive clear */ 49 .set RP_RIP,020 /* read in preset */ 50 .set RP_FMT,0x1000 /* format 22 */ 51 .set RP_MOL,0x1000 /* medium on line */ 52 .set RP_DRY,0200 /* drive ready */ 53 .set RP_ERR,040000 /* composite error */ 54 .set RP_pDRY,7 /* bit position of RP_DRY */ 55 .set RP_pERR,14 /* bit position of RP_ERR */ 56 57 init: 58 .word 0 /* entry mask for DEC monitor */ 59 nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ 60 nop;nop; 61 start: 62 clrl r10 /* major("/dev/hp0a") */ 63 extzv $13,$2,r1,r4 /* get MBA number from R1 */ 64 insv r4,$24,$8,r10 /* set MBA number */ 65 insv r3,$16,$8,r10 /* drive number */ 66 #ifdef PARTITION 67 extzv $12,$4,r5,r4 /* get partition from r5 */ 68 bicw2 $0xf000,r5 /* remove from r5 */ 69 insv r4,$8,$4,r10 /* set partition */ 70 #endif 71 movl r5,r11 72 movl r1,r9 /* save adaptor address */ 73 movl r3,r8 /* and unit number */ 74 movl $RELOC,sp 75 moval init,r6 76 movc3 $end,(r6),(sp) 77 jmp *$RELOC+start1 78 /* running relocated */ 79 start1: 80 movl $MBAinit,M_cr(r9) 81 /* read-in-preset the drive and set format */ 82 mull2 $RPDR,r8 83 movab RP(r9)[r8],r8 84 movl $RP_RIP+RP_GO,RP_cr(r8) 85 movl $RP_FMT,RP_off(r8) 86 87 .set PROGSIZE,(BOOTSIZE*RPBPSECT) 88 start2: 89 movl $0,RP_cyl(r8) 90 movl $1,RP_stk(r8) 91 movl $-PROGSIZE,M_bc(r9) 92 /* set up MASSBUS map for DMA */ 93 clrl r0 94 1: 95 bisl3 $0x80000000,r0,M_map(r9)[r0] 96 aobleq $BOOTSIZE,r0,1b 97 clrl M_var(r9) 98 movl $RP_RED+RP_GO,RP_cr(r8) 99 rprdy: 100 movl RP_sr(r8),r0 101 bbc $RP_pDRY,r0,rprdy 102 bbs $RP_pERR,r0,rperr 103 rprdy2: 104 bbs $pMBABUSY,M_sr(r9),rprdy2 105 106 /* Eagles are too fast for the controller. Slow the thing down. */ 107 /* (May not be needed with wait for mba above.) */ 108 clrl r3 109 buzz: acbl $2000,$1,r3,buzz 110 bicpsw $2 111 jbr clear 112 rperr: 113 halt 114 /* clear core and execute program */ 115 clear: 116 movl $PROGSIZE,r3 117 clrcor: 118 clrq (r3) 119 acbl $RELOC,$8,r3,clrcor 120 /* run loaded program */ 121 calls $0,*$0 122 brw start2 123 124 end: 125