diff options
| author | Heiko Carstens | 2005-06-21 17:16:30 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2005-06-21 19:07:34 -0700 |
| commit | e9b9a04796eade5241452a913ec6f3433437b4f5 (patch) | |
| tree | 9cd181fb9e905245dc07913c3a3e421d17ca6ac9 /arch/s390/kernel/head.S | |
| parent | 447570cfde680d5bf09c47b9c8d1dcf5bcb18f10 (diff) | |
[PATCH] s390: memory detection > 32GB
The kernel takes a very long time to boot if the memory size is bigger then
32767 MB. The memory size is contained in a structure created by an sclp
call. The kernel accesses the field with a LH instrution which performs a
sign extension of a 16 bit word. In the case of a memory size with bit 2^15
set this results in a very large value and the memory detection just loops for
a long time. In addition if more then 64 GB are used on a 64 bit system the
memory size is read from an incorrect storage location.
Use zero-extention to read the 16 bit memory size and the correct offset to
read the 4 byte memory size on 64 bit.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/s390/kernel/head.S')
| -rw-r--r-- | arch/s390/kernel/head.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S index b804c55bd919..658e8de74f88 100644 --- a/arch/s390/kernel/head.S +++ b/arch/s390/kernel/head.S @@ -517,10 +517,10 @@ startup:basr %r13,0 # get base l %r2, .Lrcp2-.LPG1(%r13) # try with Read SCP b .Lservicecall-.LPG1(%r13) .Lprocsccb: - lh %r1,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 - chi %r1,0x00 - jne .Lscnd - l %r1,.Lscpincr2-PARMAREA(%r4) # otherwise use this one + lhi %r1,0 + icm %r1,3,.Lscpincr1-PARMAREA(%r4) # use this one if != 0 + jnz .Lscnd + l %r1,.Lscpincr2-PARMAREA+4(%r4) # otherwise use this one .Lscnd: xr %r3,%r3 # same logic ic %r3,.Lscpa1-PARMAREA(%r4) |