/* hkboot.s 4.1 83/02/16 */ /* * RK07 1st level boot program: loads next 7.5Kbytes from * boot sector of file system and sets it up to run. * Always reads from drive 0. */ .set RELOC,0x50000 .set BOOTSIZE,15 /* size of boot in sectors */ .set SID,62 /* system ID register */ /* UBA registers */ .set UBA_CNFGR,0 /* UBA configuration register */ .set UBA_CR,4 /* UBA control register offset */ .set UBA_MAP,0x800 /* UBA offset to map reg's */ .set UBAinit,1 /* UBA init bit in UBA control reg */ .set pUBIC,16 /* Unibus init complete */ /* RK611 registers and bits */ .set HK,0177440-0160000 /* address of RK611 */ .set HK_cs1,HK+0 /* control and status */ .set HK_wc,HK+2 /* word count */ .set HK_ba,HK+4 /* bus address */ .set HK_da,HK+6 /* disk address */ .set HK_dc,HK+020 /* desired cylinder */ .set HKBPSECT,512 /* bytes per sector */ .set HK_GO,1 /* go bit */ .set HK_PACK,2 /* pack acknowledge */ .set HK_RCOM,020 /* read command */ .set HK_SEL7,02000 /* select RK07 disk */ .set HK_pRDY,7 /* position of ready bit */ .set HK_pERR,15 /* position of error bit */ init: /* r9 UBA address */ /* r10 umem addr */ .word 0 /* entry mask for dec monitor */ nop;nop;nop;nop;nop;nop;nop;nop /* some no-ops for 750 boot to skip */ nop;nop; /* get cpu type and find the first uba */ mfpr $SID,r0 extzv $24,$8,r0,r0 /* get cpu type */ ashl $2,r0,r1 movab physUBA,r2 /* get physUBA[cpu] */ addl2 r1,r2 movl (r2),r9 movab physUMEM,r2 /* get physUMEM[cpu] */ addl2 r1,r2 movl (r2),r10 /* if 780, init uba */ cmpl r0,$1 bneq 2f movl $UBAinit,UBA_CR(r9) 1: bbc $pUBIC,UBA_CNFGR(r9),1b 2: /* init rk611, set vv in drive 0; if any errors, give up */ movw $HK_SEL7+HK_GO,HK_cs1(r10) 1: movw HK_cs1(r10),r0 bbc $HK_pRDY,r0,1b bbs $HK_pERR,r0,9f movw $HK_SEL7+HK_PACK+HK_GO,HK_cs1(r10) 1: movw HK_cs1(r10),r0 bbc $HK_pRDY,r0,1b bbc $HK_pERR,r0,start 9: halt /* relocate to high core */ start: movl r5,r11 /* boot flags */ movl $RELOC,sp moval init,r6 movc3 $end,(r6),(sp) jmp *$RELOC+start2 /* now running relocated */ /* bring in the boot program */ .set PROGSIZE,(BOOTSIZE*HKBPSECT) start2: movw $0,HK_dc(r10) movw $1,HK_da(r10) movw $-PROGSIZE/2,HK_wc(r10) clrl r0 1: bisl3 $0x80000000,r0,UBA_MAP(r9) addl2 $4,r9 aobleq $BOOTSIZE,r0,1b clrw HK_ba(r10) movw $HK_SEL7+HK_RCOM+HK_GO,HK_cs1(r10) hkrdy: movw HK_cs1(r10),r0 bbc $HK_pRDY,r0,hkrdy bbs $HK_pERR,r0,hkerr brw done hkerr: halt /* ungraceful */ done: movl $PROGSIZE,r3 clrcor: clrq (r3) acbl $RELOC,$8,r3,clrcor /* start loaded program */ movl $3,r10 /* major("/dev/hk0a") */ calls $0,*$0 brw start2 physUBA: .long 0 .long 0x20006000 /* 11/780 */ .long 0xf30000 /* 11/750 */ .long 0xf26000 /* 11/730 */ physUMEM: .long 0 .long 0x2013e000 /* 11/780 */ .long 0xffe000 /* 11/750 */ .long 0xffe000 /* 11/730 */ end: