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[S390] Use alternative user-copy operations for new hardware.

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This introduces new user-copy operations which are optimized for
copying more than 256 Bytes on new hardware.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
2006-09-20 15:59:44 +02:00
committed by Martin Schwidefsky
parent d02765d1af
commit 6c2a9e6df6
6 changed files with 178 additions and 1 deletions
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13
arch/s390/kernel/head64.S
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@@ -250,6 +250,19 @@ startup_continue:
oi 7(%r12),0x80 # set IDTE flag
0:
#
# find out if we have the MVCOS instruction
#
la %r1,0f-.LPG1(%r13) # set program check address
stg %r1,__LC_PGM_NEW_PSW+8
.short 0xc800 # mvcos 0(%r0),0(%r0),%r0
.short 0x0000
.short 0x0000
0: tm 0x8f,0x13 # special-operation exception?
bno 1f-.LPG1(%r13) # if yes, MVCOS is present
oi 6(%r12),2 # set MVCOS flag
1:
lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
# virtual and never return ...
.align 16