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disk-label: introduce helper to check fat filesystem 

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
This commit is contained in:
Nikunj A Dadhania 2015-07-02 17:05:37 +05:30 committed by Alexey Kardashevskiy
parent fd5d7089dd
commit 30632f2c08
1 changed files with 9 additions and 8 deletions
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17
slof/fs/packages/disk-label.fs
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@ -320,6 +320,14 @@ CONSTANT /gpt-part-entry
\ Load from first active DOS boot partition.
: fat-bootblock? ( addr -- flag )
\ byte 0-2 of the bootblock is a jump instruction in
\ all FAT filesystems.
\ e9 and eb are jump instructions in x86 assembler.
dup c@ e9 = IF drop true EXIT THEN
dup c@ eb = swap 2+ c@ 90 = and
;
\ NOTE: block-size is always 512 bytes for DOS partition tables.
: load-from-dos-boot-partition ( addr -- size )
@ -547,14 +555,7 @@ AA268B49521E5A8B CONSTANT GPT-PREP-PARTITION-4
: try-dos-files ( -- found? )
no-mbr? IF false EXIT THEN
\ block 0 byte 0-2 is a jump instruction in all FAT
\ filesystems.
\ e9 and eb are jump instructions in x86 assembler.
block c@ e9 <> IF
block c@ eb <>
block 2+ c@ 90 <> or
IF false EXIT THEN
THEN
block fat-bootblock? 0= IF false EXIT THEN
s" fat-files" (interpose-filesystem)
true
;