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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-07-10 05:24:18 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-07-10 05:24:51 -0400
commit987ad70a4d90cf0e70dba43ece02c2e2219e092c (patch)
tree5597a511a31647acd7a11160d9db60a53f388d80 /arch
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')
-rw-r--r--arch/s390/kernel/entry.S7
-rw-r--r--arch/s390/kernel/entry64.S7
2 files changed, 12 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 6234c6978a1f..bc7ff3658c3d 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -107,6 +107,11 @@ STACK_SIZE = 1 << STACK_SHIFT
107 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 107 l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
108 .endm 108 .endm
109 109
110 .macro SAVE_ALL_SVC psworg,savearea
111 la %r12,\psworg
112 l %r15,__LC_KERNEL_STACK # problem state -> load ksp
113 .endm
114
110 .macro SAVE_ALL_SYNC psworg,savearea 115 .macro SAVE_ALL_SYNC psworg,savearea
111 la %r12,\psworg 116 la %r12,\psworg
112 tm \psworg+1,0x01 # test problem state bit 117 tm \psworg+1,0x01 # test problem state bit
@@ -218,7 +223,7 @@ system_call:
218 STORE_TIMER __LC_SYNC_ENTER_TIMER 223 STORE_TIMER __LC_SYNC_ENTER_TIMER
219sysc_saveall: 224sysc_saveall:
220 SAVE_ALL_BASE __LC_SAVE_AREA 225 SAVE_ALL_BASE __LC_SAVE_AREA
221 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 226 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
222 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 227 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
223 lh %r7,0x8a # get svc number from lowcore 228 lh %r7,0x8a # get svc number from lowcore
224#ifdef CONFIG_VIRT_CPU_ACCOUNTING 229#ifdef CONFIG_VIRT_CPU_ACCOUNTING
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 685f11faa4bc..2a7b1304418b 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -99,6 +99,11 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
99 larl %r13,system_call 99 larl %r13,system_call
100 .endm 100 .endm
101 101
102 .macro SAVE_ALL_SVC psworg,savearea
103 la %r12,\psworg
104 lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
105 .endm
106
102 .macro SAVE_ALL_SYNC psworg,savearea 107 .macro SAVE_ALL_SYNC psworg,savearea
103 la %r12,\psworg 108 la %r12,\psworg
104 tm \psworg+1,0x01 # test problem state bit 109 tm \psworg+1,0x01 # test problem state bit
@@ -207,7 +212,7 @@ system_call:
207 STORE_TIMER __LC_SYNC_ENTER_TIMER 212 STORE_TIMER __LC_SYNC_ENTER_TIMER
208sysc_saveall: 213sysc_saveall:
209 SAVE_ALL_BASE __LC_SAVE_AREA 214 SAVE_ALL_BASE __LC_SAVE_AREA
210 SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA 215 SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
211 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA 216 CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
212 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore 217 llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
213#ifdef CONFIG_VIRT_CPU_ACCOUNTING 218#ifdef CONFIG_VIRT_CPU_ACCOUNTING