* Copyright (c) 1980, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
/* "@(#)upboot.c 7.1 (Berkeley) %G%" */
.set MAJOR
,2 /* major("/dev/up0a") */
* UP 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 BOOTSIZE
,15 /* size of boot in sectors */
.set UPBPSECT
,512 /* bytes per sector */
.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 */
/* UP registers and bits */
.set UP_cs1
,0 /* control and status */
.set UP_wc
,2 /* word count */
.set UP_ba
,4 /* bus address */
.set UP_da
,6 /* disk address */
.set UP_cs2
,010 /* cs2 register */
.set UP_of
,032 /* offset register */
.set UP_dc
,034 /* desired cylinder */
.set UP_hr
,036 /* holding register */
.set UP_GO
,1 /* go bit */
.set UP_PACK
,022 /* pack acknowledge */
.set UP_DCLR
,010 /* drive clear */
.set UP_PRESET
,020 /* read-in-preset */
.set UP_RCOM
,070 /* read command */
.set UP_pRDY
,7 /* position of ready bit */
.set UP_pERR
,15 /* position of error bit */
.word
0 /* entry mask for dec monitor */
nop
;nop
;nop
;nop
;nop
;nop
;nop
;nop
/* some no-ops for 750 boot to skip */
movl $MAJOR
,r10
/* major("/dev/xx0a") */
extzv $
18,$
1,r1
,r9
/* get UBA number from R1 */
xorb2 $
0x01,r9
/* complement bit */
insv r9
,$
24,$
8,r10
/* set UBA number */
insv r3
,$
16,$
8,r10
/* drive number */
extzv $
12,$
4,r5
,r4
/* get partition from r5 */
bicw2 $
0xf000,r5
/* remove from r5 */
insv r4
,$
8,$
8,r10
/* set partition */
movl r5
,r11
/* boot flags */
movl physUBA
[r9
],r9
/* UNIBUS adaptor address */
movl r2
,r8
/* boot device CSR */
movl r3
,r7
/* unit number */
movl r9
,r1
/* UNIBUS I/O page address */
movl r8
,r2
/* boot device CSR */
movl r7
,r3
/* unit number */
/* init up, set vv in drive; if any errors, give up */
bisw3 r7
,$UPCS2_CLR
,UP_cs2(r8
)
movw $UP_DCLR
+UP_GO
,UP_cs1(r8
)
movw $UP_PRESET
+UP_GO
,UP_cs1(r8
)
/* relocate to high core */
movl r5
,r11
/* boot flags */
/* now running relocated */
.set PROGSIZE
,(BOOTSIZE
*UPBPSECT
)
movw $
-PROGSIZE
/2,UP_wc(r8
)
bisl3 $
0x80000000,r0
,UBA_MAP(r9
)
movw $UP_RCOM
+UP_GO
,UP_cs1(r8
)
.long 0xf30000 /* uba0 */
.long 0xf32000 /* uba1 */