1 /* hpboot.c 6.1 83/07/29 */ 2 3 /* 4 * RP??/RM?? 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,0x70000 10 /* MBA registers */ 11 .set M_cr,4 /* MBA control reg */ 12 .set M_var,12 /* MBA virt addr reg */ 13 .set M_bc,16 /* MBA byte count reg */ 14 .set M_map,0x800 /* start of MBA map reg's */ 15 .set MBAinit,1 /* MBA init bit in MBA control reg */ 16 /* Drive information */ 17 .set RP,0x400 /* start of drive registers */ 18 .set RP_cr,RP+0 /* control status register */ 19 .set RP_sr,RP+4 /* drive status reg */ 20 .set RP_stk,RP+0x14 /* desired track/sector reg */ 21 .set RP_dt,RP+0x18 /* drive type reg */ 22 .set RP_off,RP+0x24 /* RP offset reg */ 23 .set RP_cyl,RP+0x28 /* desired cyl reg */ 24 .set RPBPSECT,512 /* bytes per sector */ 25 /* RP?? function codes, status bits */ 26 .set RP_GO,1 /* go */ 27 .set RP_RED,070 /* read */ 28 .set RP_DC,010 /* drive clear */ 29 .set RP_RIP,020 /* read in preset */ 30 .set RP_FMT,0x1000 /* format 22 */ 31 .set RP_MOL,0x1000 /* medium on line */ 32 .set RP_DRY,0200 /* drive ready */ 33 .set RP_ERR,040000 /* composite error */ 34 .set RP_pDRY,7 /* bit position of RP_DRY */ 35 .set RP_pERR,14 /* bit position of RP_ERR */ 36 37 init: 38 .word 0 /* entry mask for DEC monitor */ 39 nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ 40 nop;nop; 41 start: 42 movl r5,r11 43 movl $RELOC,sp 44 moval init,r6 45 movc3 $end,(r6),(sp) 46 jmp *$RELOC+start1 47 /* running relocated */ 48 start1: 49 /* get cpu type */ 50 .set SID,0x3e 51 mfpr $SID,r0 52 extzv $24,$8,r0,r0 53 ashl $2,r0,r1 54 /* get mba location and init it */ 55 moval physMBA,r2 56 addl3 r1,r2,r3 57 movl (r3),r9 58 movl $MBAinit,M_cr(r9) 59 /* read-in-preset the drive and set format */ 60 movl $RP_RIP+RP_GO,RP_cr(r9) 61 movl $RP_FMT,RP_off(r9) 62 63 .set PROGSIZE,(BOOTSIZE*RPBPSECT) 64 start2: 65 movl $0,RP_cyl(r9) 66 movl $1,RP_stk(r9) 67 movl $-PROGSIZE,M_bc(r9) 68 /* set up MASSBUS map for DMA */ 69 clrl r0 70 1: 71 bisl3 $0x80000000,r0,M_map(r9)[r0] 72 aobleq $BOOTSIZE,r0,1b 73 clrl M_var(r9) 74 movl $RP_RED+RP_GO,RP_cr(r9) 75 rprdy: 76 movl RP_sr(r9),r0 77 bbc $RP_pDRY,r0,rprdy 78 bbs $RP_pERR,r0,rperr 79 clrl r3 80 /* Eagle's are too fast for the controller. Slow the thing down. */ 81 buzz: acbl $2000,$1,r3,buzz 82 bicpsw $2 83 jbr clear 84 rperr: 85 halt 86 /* clear core and execute program */ 87 clear: 88 movl $PROGSIZE,r3 89 clrcor: 90 clrq (r3) 91 acbl $RELOC,$8,r3,clrcor 92 /* run loaded program */ 93 clrl r10 /* major("/dev/hp0a") */ 94 calls $0,*$0 95 brw start2 96 97 .align 2 98 physMBA: 99 .long 0 100 .long 0x20010000 101 .long 0xf28000 102 103 end: 104