s390: add zEC12 code generation support
Allow to generate code that only runs on zEC12 machines.
Also add a check which prevents the kernel to run on machines which
do not have any of the following new facilities installed:
- (48) decimal-floating-point zoned-conversion
- (49) execution-hint
- (49) load-and-trap
- (49) miscellaneous-instruction-extensions
- (49) processor-assist
- (50) constrained transactional-execution
- (73) transactional-execution
48, 49, 50 and 73 are the bit numbers of the facility indications for
each of the required facilities.
Note that we assume that user-space gets compiled with the same
compiler options, therefore we also test for a dfp facility even
if the kernel doesn't make use of it.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index d385f39..1bf4b29 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -169,6 +169,10 @@
def_bool n
select HAVE_MARCH_Z10_FEATURES
+config HAVE_MARCH_ZEC12_FEATURES
+ def_bool n
+ select HAVE_MARCH_Z196_FEATURES
+
choice
prompt "Processor type"
default MARCH_G5
@@ -220,6 +224,13 @@
(2818 and 2817 series). The kernel will be slightly faster but will
not work on older machines.
+config MARCH_ZEC12
+ bool "IBM zEC12"
+ select HAVE_MARCH_ZEC12_FEATURES if 64BIT
+ help
+ Select this to enable optimizations for IBM zEC12 (2827 series). The
+ kernel will be slightly faster but will not work on older machines.
+
endchoice
config 64BIT
