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
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 49e76e8..4b8e08b 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -41,6 +41,7 @@
cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)
cflags-$(CONFIG_MARCH_Z10) += $(call cc-option,-march=z10)
cflags-$(CONFIG_MARCH_Z196) += $(call cc-option,-march=z196)
+cflags-$(CONFIG_MARCH_ZEC12) += $(call cc-option,-march=zEC12)
#KBUILD_IMAGE is necessary for make rpm
KBUILD_IMAGE :=arch/s390/boot/image
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 984726c..fd8db63 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -393,30 +393,35 @@
xc 0x300(256),0x300
xc 0xe00(256),0xe00
stck __LC_LAST_UPDATE_CLOCK
- spt 5f-.LPG0(%r13)
- mvc __LC_LAST_UPDATE_TIMER(8),5f-.LPG0(%r13)
+ spt 6f-.LPG0(%r13)
+ mvc __LC_LAST_UPDATE_TIMER(8),6f-.LPG0(%r13)
xc __LC_STFL_FAC_LIST(8),__LC_STFL_FAC_LIST
#ifndef CONFIG_MARCH_G5
# check capabilities against MARCH_{G5,Z900,Z990,Z9_109,Z10}
.insn s,0xb2b10000,__LC_STFL_FAC_LIST # store facility list
tm __LC_STFL_FAC_LIST,0x01 # stfle available ?
jz 0f
- la %r0,0
+ la %r0,1
.insn s,0xb2b00000,__LC_STFL_FAC_LIST # store facility list extended
-0: l %r0,__LC_STFL_FAC_LIST
- n %r0,2f+8-.LPG0(%r13)
- cl %r0,2f+8-.LPG0(%r13)
- jne 1f
- l %r0,__LC_STFL_FAC_LIST+4
- n %r0,2f+12-.LPG0(%r13)
- cl %r0,2f+12-.LPG0(%r13)
- je 3f
-1: l %r15,.Lstack-.LPG0(%r13)
+ # verify if all required facilities are supported by the machine
+0: la %r1,__LC_STFL_FAC_LIST
+ la %r2,3f+8-.LPG0(%r13)
+ l %r3,0(%r2)
+1: l %r0,0(%r1)
+ n %r0,4(%r2)
+ cl %r0,4(%r2)
+ jne 2f
+ la %r1,4(%r1)
+ la %r2,4(%r2)
+ ahi %r3,-1
+ jnz 1b
+ j 4f
+2: l %r15,.Lstack-.LPG0(%r13)
ahi %r15,-96
la %r2,.Lals_string-.LPG0(%r13)
l %r3,.Lsclp_print-.LPG0(%r13)
basr %r14,%r3
- lpsw 2f-.LPG0(%r13) # machine type not good enough, crash
+ lpsw 3f-.LPG0(%r13) # machine type not good enough, crash
.Lals_string:
.asciz "The Linux kernel requires more recent processor hardware"
.Lsclp_print:
@@ -424,33 +429,42 @@
.Lstack:
.long 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
.align 16
-2: .long 0x000a0000,0x8badcccc
+3: .long 0x000a0000,0x8badcccc
+
+# List of facilities that are required. If not all facilities are present
+# the kernel will crash. Format is number of facility words with bits set,
+# followed by the facility words.
+
#if defined(CONFIG_64BIT)
-#if defined(CONFIG_MARCH_Z196)
- .long 0xc100efe3, 0xf46c0000
+#if defined(CONFIG_MARCH_ZEC12)
+ .long 3, 0xc100efe3, 0xf46ce000, 0x00400000
+#elif defined(CONFIG_MARCH_Z196)
+ .long 2, 0xc100efe3, 0xf46c0000
#elif defined(CONFIG_MARCH_Z10)
- .long 0xc100efe3, 0xf0680000
+ .long 2, 0xc100efe3, 0xf0680000
#elif defined(CONFIG_MARCH_Z9_109)
- .long 0xc100efc3, 0x00000000
+ .long 1, 0xc100efc3
#elif defined(CONFIG_MARCH_Z990)
- .long 0xc0002000, 0x00000000
+ .long 1, 0xc0002000
#elif defined(CONFIG_MARCH_Z900)
- .long 0xc0000000, 0x00000000
+ .long 1, 0xc0000000
#endif
#else
-#if defined(CONFIG_MARCH_Z196)
- .long 0x8100c880, 0x00000000
+#if defined(CONFIG_MARCH_ZEC12)
+ .long 1, 0x8100c880
+#elif defined(CONFIG_MARCH_Z196)
+ .long 1, 0x8100c880
#elif defined(CONFIG_MARCH_Z10)
- .long 0x8100c880, 0x00000000
+ .long 1, 0x8100c880
#elif defined(CONFIG_MARCH_Z9_109)
- .long 0x8100c880, 0x00000000
+ .long 1, 0x8100c880
#elif defined(CONFIG_MARCH_Z990)
- .long 0x80002000, 0x00000000
+ .long 1, 0x80002000
#elif defined(CONFIG_MARCH_Z900)
- .long 0x80000000, 0x00000000
+ .long 1, 0x80000000
#endif
#endif
-3:
+4:
#endif
#ifdef CONFIG_64BIT
@@ -459,14 +473,14 @@
jg startup_continue
#else
/* Continue with 31bit startup code in head31.S */
- l %r13,4f-.LPG0(%r13)
+ l %r13,5f-.LPG0(%r13)
b 0(%r13)
.align 8
-4: .long startup_continue
+5: .long startup_continue
#endif
.align 8
-5: .long 0x7fffffff,0xffffffff
+6: .long 0x7fffffff,0xffffffff
#include "head_kdump.S"
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index cfdad57..2568590 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -1006,6 +1006,9 @@
case 0x2818:
strcpy(elf_platform, "z196");
break;
+ case 0x2827:
+ strcpy(elf_platform, "zEC12");
+ break;
}
}
