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disk-label: simplify gpt-prep-partition? routine 

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 17:05:35 +05:30 committed by Alexey Kardashevskiy
parent 99c534ecc7
commit 655fabf136
1 changed files with 15 additions and 26 deletions
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41
slof/fs/packages/disk-label.fs
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@ -352,42 +352,31 @@ CONSTANT /gpt-part-entry
drop 0
;
\ Check for GPT PReP partition GUID
9E1A2D38 CONSTANT GPT-PREP-PARTITION-1
C612 CONSTANT GPT-PREP-PARTITION-2
4316 CONSTANT GPT-PREP-PARTITION-3
AA26 CONSTANT GPT-PREP-PARTITION-4
8B49521E5A8B CONSTANT GPT-PREP-PARTITION-5
\ Check for GPT PReP partition GUID. Only first 3 blocks are
\ byte-swapped treating last two blocks as contigous for simplifying
\ comparison
9E1A2D38 CONSTANT GPT-PREP-PARTITION-1
C612 CONSTANT GPT-PREP-PARTITION-2
4316 CONSTANT GPT-PREP-PARTITION-3
AA268B49521E5A8B CONSTANT GPT-PREP-PARTITION-4
: gpt-prep-partition? ( -- true|false )
block gpt-part-entry>part-type-guid l@-le GPT-PREP-PARTITION-1 = IF
block gpt-part-entry>part-type-guid 4 + w@-le
GPT-PREP-PARTITION-2 = IF
block gpt-part-entry>part-type-guid 6 + w@-le
GPT-PREP-PARTITION-3 = IF
block gpt-part-entry>part-type-guid 8 + w@
GPT-PREP-PARTITION-4 = IF
block gpt-part-entry>part-type-guid a + w@
block gpt-part-entry>part-type-guid c + l@ swap lxjoin
GPT-PREP-PARTITION-5 = IF
TRUE EXIT
THEN
THEN
THEN
THEN
THEN
FALSE
block gpt-part-entry>part-type-guid
dup l@-le GPT-PREP-PARTITION-1 <> IF drop false EXIT THEN
dup 4 + w@-le GPT-PREP-PARTITION-2 <> IF drop false EXIT THEN
dup 6 + w@-le GPT-PREP-PARTITION-3 <> IF drop false EXIT THEN
8 + x@ GPT-PREP-PARTITION-4 =
;
: load-from-gpt-prep-partition ( addr -- size )
no-gpt? IF drop FALSE EXIT THEN
no-gpt? IF drop false EXIT THEN
debug-disk-label? IF
cr ." GPT partition found " cr
THEN
1 read-sector block gpt>part-entry-lba l@-le
block-size * to seek-pos
block gpt>part-entry-size l@-le to gpt-part-size
block gpt>num-part-entry l@-le dup 0= IF FALSE EXIT THEN
block gpt>num-part-entry l@-le dup 0= IF false EXIT THEN
1+ 1 ?DO
seek-pos 0 seek drop
block gpt-part-size read drop gpt-prep-partition? IF
@ -405,7 +394,7 @@ AA26 CONSTANT GPT-PREP-PARTITION-4
THEN
seek-pos gpt-part-size i * + to seek-pos
LOOP
FALSE
false
;
\ Extract the boot loader path from a bootinfo.txt file