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\ Hypervisor Software File: sunlabel.fth
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id: @(#)sunlabel.fth 2.24 97/01/28
purpose: Sun disk label (disk-label) package
copyright: Copyright 1990 Sun Microsystems, Inc. All Rights Reserved
\ Sun Label package. Runs on top of a disk device, dividing that disk
\ into logical partitions as described in a "label" stored in the first
\ 512-byte block. Implements the "load" operation by reading a 7.5 Kbyte
\ "bootblk" starting 512 bytes from the beginning of a partition.
\ The complete contents of the label block is described in
\ /usr/include/sun/dklabel.h
" disk-label" device-name
d# 512 constant ublock \ Logical block size. Also size of label.
ublock d# 15 * constant /bootblk \ Size of "bootblk" code stored after label
0 instance value dklabel \ Label buffer; used temporarily during open
instance variable partition#
instance variable dkl_ncyl \ # of data cylinders
instance variable dkl_acyl \ # of alternate cylinders
instance variable dkl_nhead \ # of heads
instance variable dkl_nsect \ # of sectors per track
: label@ ( offset -- short ) dklabel + w@ ;
: label-valid? ( -- flag )
d# 508 label@ h# dabe <> if
." Bad magic number in disk label" cr false exit
0 dklabel ublock bounds ?do i w@ xor /w +loop ( checksum )
0<> if ." Bad checksum in disk label" cr false exit then
: set-start-block ( partition# -- error?? )
8 * d# 444 dklabel + + unaligned-l@ ( start-cyl )
d# 436 label@ ( .. #heads ) * ( start-trk )
d# 438 label@ ( .. sectors/trk ) * ( start-block )
d# 436 label@ dkl_nhead !
d# 438 label@ dkl_nsect !
: get-dkl-info ( -- ncyl acyl nhead nsect )
: read ( len buf -- actual-len ) " read" $call-parent ;
: write ( len buf -- actual-len ) " write" $call-parent ;
: seek ( offset-low offset-high -- okay? ) " seek" $call-parent ;
: offset ( offset-low offset-high -- offset-low' offset-high' )
partition# @ 0 d+ ( low high ) \ Add start of partition
: open-part ( file$ part$ -- file$ okay? )
\ The "nolabel" partition maps the entire disk, and does not look at the label
2dup " nolabel" $= if 2drop true exit then
\ Accept partition letters a, b, c, ... or A, B, C, ...
c@ upc ascii A - ( file$ part# )
\ No partition specified : default to "a"
\ Rewrite "my-args" and insert the partition label.
\ File argument--need to allocate space for that
dup 2+ ( <part><,><file$> ) dup alloc-mem ( file$ len adr )
ascii a over c! ascii , over 1+ c! ( file$ len adr )
2over 2 pick 2+ swap move swap ( file$ adr len )
ascii a 1 alloc-mem tuck c! 1 ( file$ adr len )
my-parent package( to my-args-len to my-args-adr )package
\ Initially set partition to 0 so that we can
\ read the label which is in the first partition
0 partition# ! ( file$ part# )
ublock alloc-mem is dklabel ( file$ part# )
dklabel 0= if ( file$ part# )
." Can't allocate memory for disk label" ( file$ part# )
drop false exit ( file$ false )
0 0 seek drop ( file$ part# )
dklabel ublock read ublock <> if ( file$ part# )
." Can't read disk label." cr drop false ( file$ false )
set-start-block label-valid? ( file$ okay? )
dklabel ublock free-mem ( file$ okay? )
\ Arg string is <part>[,<filespec>]
\ Split off partition, and handle via open-part
my-args ascii , left-parse-string ( file$ part$ )
open-part 0= if 2drop false exit then ( file$ )
" ufs-file-system" find-package if
: close ( -- ) ; \ Nothing to do, since we only use 1 cell of data
: load ( adr -- size ) \ Pass in load-base
ublock 0 seek drop ( adr ) \ Should check for errors
ublock d# 15 * tuck ( len adr len )
tuck <> if ." Short disk read" cr then ( actual-len )
: size ( -- d.size ) /bootblk s>d ;
projects / OpenSPARC-T2-SAM / blob