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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-11-24 12:33:07 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-12-18 14:59:19 +0100 |
| commit | 76cdd44c2e56ffabc297494c090c6babc8985998 (patch) | |
| tree | b737f0cbfa3fcbf1abf96d4e087f38194bddd8d1 /arch/s390/kernel/head.S | |
| parent | s390/facilities: use stfl mnemonic instead of insn magic (diff) | |
| download | linux-76cdd44c2e56ffabc297494c090c6babc8985998.tar.xz linux-76cdd44c2e56ffabc297494c090c6babc8985998.zip | |
s390/facilities: always use lowcore's stfle field for storing facility bits
head.s contains an stfle instruction which stores it result at the
storage location that is assigned to the stfl instruction.
This is currently no problem, since we only care about one double
word. However if the number of double words in the ALS bitfield grows
the current code is not very stable.
E.g. before issuing the stfle command the memory to which it stores
must be cleared, since the instruction may or may not clear memory
contents where no bits are set.
In order to simplify the code a bit always use the storage location
that we reserved for the stfle result.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head.S')
| -rw-r--r-- | arch/s390/kernel/head.S | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S index d893d5aeb307..d28a14849126 100644 --- a/arch/s390/kernel/head.S +++ b/arch/s390/kernel/head.S @@ -300,19 +300,19 @@ ENTRY(startup_kdump) xc 0x200(256),0x200 # partially clear lowcore xc 0x300(256),0x300 xc 0xe00(256),0xe00 + xc 0xf00(256),0xf00 lctlg %c0,%c15,0x200(%r0) # initialize control registers stck __LC_LAST_UPDATE_CLOCK spt 6f-.LPG0(%r13) mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13) - xc __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST - # check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10} stfl 0(%r0) # store facilities @ __LC_STFL_FAC_LIST - tm __LC_STFL_FAC_LIST,0x01 # stfle available ? + mvc __LC_STFLE_FAC_LIST(4),__LC_STFL_FAC_LIST + tm __LC_STFLE_FAC_LIST,0x01 # stfle available ? jz 0f la %r0,1 - .insn s,0xb2b00000,__LC_STFL_FAC_LIST # store facility list extended + .insn s,0xb2b00000,__LC_STFLE_FAC_LIST # store facility list extended # verify if all required facilities are supported by the machine -0: la %r1,__LC_STFL_FAC_LIST +0: la %r1,__LC_STFLE_FAC_LIST la %r2,3f+8-.LPG0(%r13) l %r3,0(%r2) 1: l %r0,0(%r1) |