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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-07-10 11:24:18 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-07-10 11:24:51 +0200
commit987ad70a4d90cf0e70dba43ece02c2e2219e092c (patch)
tree5597a511a31647acd7a11160d9db60a53f388d80 /arch/s390/kernel/entry.S
parent3d62149f025134cd69c2fef2a2ccfac3c3c2054f (diff)
[S390] system call optimization.
After the in-kernel system call has been remove the system call path can be optimized. The problem state bit of the old psw is always set between system_call and sysc_do_svc. SAVE_ALL_SVC uses this information to avoid two instructions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
-rw-r--r--arch/s390/kernel/entry.S7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 6234c6978a1..bc7ff3658c3 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -107,6 +107,11 @@ STACK_SIZE = 1 << STACK_SHIFT
l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
.endm
+ .macro SAVE_ALL_SVC psworg,savearea
+ la %r12,\psworg
+ l %r15,__LC_KERNEL_STACK # problem state -> load ksp
+ .endm
+
.macro SAVE_ALL_SYNC psworg,savearea
la %r12,\psworg
tm \psworg+1,0x01 # test problem state bit
@@ -218,7 +223,7 @@ system_call:
STORE_TIMER __LC_SYNC_ENTER_TIMER
sysc_saveall:
SAVE_ALL_BASE __LC_SAVE_AREA
- SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+ SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
lh %r7,0x8a # get svc number from lowcore
#ifdef CONFIG_VIRT_CPU_ACCOUNTING