diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2012-05-09 16:27:39 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-05-16 14:42:41 +0200 |
| commit | 473e66baad1e83e6c5dfdca65aba03bf21727202 (patch) | |
| tree | aab0bd4a295b41d1e29952b2b1260ad72150496b /arch/s390/kernel | |
| parent | 2739b6d12407792f253b7a15233930338e6831c9 (diff) | |
s390/time: always use stckf instead of stck if available
The store clock fast instruction saves a couple of instructions compared
to the store clock instruction. Always use stckf instead of stck if it
is available.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/early.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/entry64.S | 16 |
2 files changed, 12 insertions, 6 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 9475e682727..d84181f1f5e 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -374,8 +374,6 @@ static __init void detect_machine_facilities(void) S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; if (test_facility(40)) S390_lowcore.machine_flags |= MACHINE_FLAG_SPP; - if (test_facility(25)) - S390_lowcore.machine_flags |= MACHINE_FLAG_STCKF; #endif } diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 3a633af72ba..444fd72e078 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -148,6 +148,14 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) ssm __LC_RETURN_PSW .endm + .macro STCK savearea +#if defined(CONFIG_64BIT) && !defined(CONFIG_MARCH_Z900) && !defined(CONFIG_MARCH_Z990) + .insn s,0xb27c0000,\savearea # store clock fast +#else + .insn s,0xb2050000,\savearea # store clock +#endif + .endm + .section .kprobes.text, "ax" /* @@ -458,7 +466,7 @@ pgm_svcper: * IO interrupt handler routine */ ENTRY(io_int_handler) - stck __LC_INT_CLOCK + STCK __LC_INT_CLOCK stpt __LC_ASYNC_ENTER_TIMER stmg %r8,%r15,__LC_SAVE_AREA_ASYNC lg %r10,__LC_LAST_BREAK @@ -604,7 +612,7 @@ io_notify_resume: * External interrupt handler routine */ ENTRY(ext_int_handler) - stck __LC_INT_CLOCK + STCK __LC_INT_CLOCK stpt __LC_ASYNC_ENTER_TIMER stmg %r8,%r15,__LC_SAVE_AREA_ASYNC lg %r10,__LC_LAST_BREAK @@ -639,7 +647,7 @@ ENTRY(psw_idle) larl %r1,psw_idle_lpsw+4 stg %r1,__SF_EMPTY+8(%r15) larl %r1,.Lvtimer_max - stck __IDLE_ENTER(%r2) + STCK __IDLE_ENTER(%r2) ltr %r5,%r5 stpt __VQ_IDLE_ENTER(%r3) jz psw_idle_lpsw @@ -655,7 +663,7 @@ __critical_end: * Machine check handler routines */ ENTRY(mcck_int_handler) - stck __LC_MCCK_CLOCK + STCK __LC_MCCK_CLOCK la %r1,4095 # revalidate r1 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs |