diff options
Diffstat (limited to 'sys/arch/vax/stand/xxboot/start.S')
| -rw-r--r-- | sys/arch/vax/stand/xxboot/start.S | 44 |
1 files changed, 2 insertions, 42 deletions
diff --git a/sys/arch/vax/stand/xxboot/start.S b/sys/arch/vax/stand/xxboot/start.S index ead88591dc4..df019026dc9 100644 --- a/sys/arch/vax/stand/xxboot/start.S +++ b/sys/arch/vax/stand/xxboot/start.S @@ -1,4 +1,4 @@ -/* $OpenBSD: start.S,v 1.2 2003/11/07 10:16:45 jmc Exp $ */ +/* $OpenBSD: start.S,v 1.3 2011/07/06 18:32:59 miod Exp $ */ /* $NetBSD: start.S,v 1.1 2002/02/24 01:04:26 matt Exp $ */ /* * Copyright (c) 1995 Ludd, University of Lule}, Sweden. @@ -64,8 +64,7 @@ _C_LABEL(start): brb from_0x08 # skip ... .org 0x0C # 11/750 & 8200 starts here - movzbl $1,_C_LABEL(from)# We booted from "old" rom. - brw cont_750 + halt # not supported from_0x00: # uVAX from TK50 @@ -132,45 +131,6 @@ start_vmb: _C_LABEL(from): .long 0 -/* - * After bootblock (LBN0) has been loaded into the first page - * of good memory by 11/750's ROM-code (transfer address - * of bootblock-code is: base of good memory + 0x0C) registers - * are initialized as: - * R0: type of boot-device - * 0: Massbus device - * 1: RK06/RK07 - * 2: RL02 - * 17: UDA50 - * 35: TK50 - * 64: TU58 - * R1: (UBA) address of UNIBUS I/O-page - * (MBA) address of boot device's adapter - * R2: (UBA) address of the boot device's CSR - * (MBA) controller number of boot device - * R6: address of driver subroutine in ROM - * - * cont_750 reads in LBN1-15 for further execution. - */ -cont_750: - movl $_C_LABEL(start), sp # move stack to avoid clobbering the code - pushr $0x131 # save clobbered registers - clrl r4 # %r4 == # of blocks transferred - movab _C_LABEL(start),r5 # %r5 have base address for next transfer - pushl r5 # ...on stack also (Why?) -1: incl r4 # increment block count - movl r4,r8 # LBN is in %r8 for rom routine - addl2 $0x200,r5 # Increase address for next read - cmpl $16,r4 # read 15 blocks? - beql 2f # Yep - movl r5,(sp) # move address to stack also - jsb (r6) # read 512 bytes - blbs r0,1b # jump if read succeeded - halt # otherwise die... -2: tstl (sp)+ # remove boring arg from stack - popr $0x131 # restore clobbered registers - brw start_all # Ok, continue... - /* uVAX main entry is at the start of the second disk block. This is * needed for multi-arch CD booting where multiple architecture need * to shove stuff in boot block 0. |