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author | Michael Holzheu <holzheu@linux.vnet.ibm.com> | 2011-08-03 16:44:19 +0200 |
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committer | Heiko Carstens <heiko.carstens@de.ibm.com> | 2011-08-03 16:44:19 +0200 |
commit | 7dd6b3343fdc190712d1620ee8848d25c4c77c33 (patch) | |
tree | e4c3258880f88096f9ecf65fa2cca20e62b5813d /arch/s390/mm | |
parent | 944291de33b26a8b403f13f5eb0cc51fb982aa1e (diff) | |
download | linux-3.10-7dd6b3343fdc190712d1620ee8848d25c4c77c33.tar.gz linux-3.10-7dd6b3343fdc190712d1620ee8848d25c4c77c33.tar.bz2 linux-3.10-7dd6b3343fdc190712d1620ee8848d25c4c77c33.zip |
[S390] Add PSW restart shutdown trigger
With this patch a new S390 shutdown trigger "restart" is added. If under
z/VM "systerm restart" is entered or under the HMC the "PSW restart" button
is pressed, the PSW located at 0 (31 bit) or 0x1a0 (64 bit) bit is loaded.
Now we execute do_restart() that processes the restart action that is
defined under /sys/firmware/shutdown_actions/on_restart. Currently the
following actions are possible: reipl (default), stop, vmcmd, dump, and
dump_reipl.
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r-- | arch/s390/mm/maccess.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c index 51e5cd9b906..5dbbaa6e594 100644 --- a/arch/s390/mm/maccess.c +++ b/arch/s390/mm/maccess.c @@ -85,3 +85,19 @@ int memcpy_real(void *dest, void *src, size_t count) arch_local_irq_restore(flags); return rc; } + +/* + * Copy memory to absolute zero + */ +void copy_to_absolute_zero(void *dest, void *src, size_t count) +{ + unsigned long cr0; + + BUG_ON((unsigned long) dest + count >= sizeof(struct _lowcore)); + preempt_disable(); + __ctl_store(cr0, 0, 0); + __ctl_clear_bit(0, 28); /* disable lowcore protection */ + memcpy_real(dest + store_prefix(), src, count); + __ctl_load(cr0, 0, 0); + preempt_enable(); +} |