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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2017-01-11 11:14:45 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-01-16 09:27:55 +0300 |
| commit | 742dc5773cf5bbb355e4b4dd61310d5f51556477 (patch) | |
| tree | c5bcd9921d22571dfd55a333c3746c44dec278a2 /arch/s390/include/asm/ctl_reg.h | |
| parent | 68cc795d1933285705ced6d841ef66c00ce98cbe (diff) | |
| download | linux-742dc5773cf5bbb355e4b4dd61310d5f51556477.tar.xz | |
s390/sclp: make early sclp irq handler more robust
Make the early sclp interrupt handler more robust:
- disable all interrupt sub classes except for the service signal subclass
- extend ctlreg0 union so it is easily possible to set the service signal
subclass mask bit without using a magic number
- disable lowcore protection before writing to it
- make sure that all write accesses are done before the original content
of control register 0 is restored, which could enable lowcore protection
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ctl_reg.h')
| -rw-r--r-- | arch/s390/include/asm/ctl_reg.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/include/asm/ctl_reg.h b/arch/s390/include/asm/ctl_reg.h index 8e136b88cdf4..cf4c9a106049 100644 --- a/arch/s390/include/asm/ctl_reg.h +++ b/arch/s390/include/asm/ctl_reg.h @@ -62,7 +62,9 @@ union ctlreg0 { unsigned long : 4; unsigned long afp : 1; /* AFP-register control */ unsigned long vx : 1; /* Vector enablement control */ - unsigned long : 17; + unsigned long : 7; + unsigned long sssm : 1; /* Service signal subclass mask */ + unsigned long : 9; }; }; |