diff options
| author | Gerald Schaefer <geraldsc@de.ibm.com> | 2006-09-20 15:59:44 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-09-20 15:59:44 +0200 |
| commit | 6c2a9e6df60478e712f3c3d98b5047778a82a3d7 (patch) | |
| tree | 6768eb3991f4f1616b211a21ccf1b8e27820ae79 /arch/s390/kernel | |
| parent | d02765d1af743567398eb6d523dea0ba5e5e7e8e (diff) | |
[S390] Use alternative user-copy operations for new hardware.
This introduces new user-copy operations which are optimized for
copying more than 256 Bytes on new hardware.
Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/head64.S | 13 | ||||
| -rw-r--r-- | arch/s390/kernel/setup.c | 6 |
2 files changed, 18 insertions, 1 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 1ebaa338aa7..a8bdd96494c 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -250,6 +250,19 @@ startup_continue: oi 7(%r12),0x80 # set IDTE flag 0: +# +# find out if we have the MVCOS instruction +# + la %r1,0f-.LPG1(%r13) # set program check address + stg %r1,__LC_PGM_NEW_PSW+8 + .short 0xc800 # mvcos 0(%r0),0(%r0),%r0 + .short 0x0000 + .short 0x0000 +0: tm 0x8f,0x13 # special-operation exception? + bno 1f-.LPG1(%r13) # if yes, MVCOS is present + oi 6(%r12),2 # set MVCOS flag +1: + lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space, # virtual and never return ... .align 16 diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index e229af59976..e3d9325f602 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -647,7 +647,11 @@ setup_arch(char **cmdline_p) memory_end = memory_size; - memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); + if (MACHINE_HAS_MVCOS) + memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess)); + else + memcpy(&uaccess, &uaccess_std, sizeof(uaccess)); + parse_early_param(); #ifndef CONFIG_64BIT |