Commit 991c1505 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

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: default avatarHeiko Carstens <>
parent d1e57508
......@@ -169,6 +169,10 @@ config HAVE_MARCH_Z196_FEATURES
def_bool n
def_bool n
prompt "Processor type"
default MARCH_G5
......@@ -220,6 +224,13 @@ config MARCH_Z196
(2818 and 2817 series). The kernel will be slightly faster but will
not work on older machines.
config MARCH_ZEC12
bool "IBM zEC12"
Select this to enable optimizations for IBM zEC12 (2827 series). The
kernel will be slightly faster but will not work on older machines.
config 64BIT
......@@ -41,6 +41,7 @@ cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
cflags-$(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
......@@ -393,30 +393,35 @@ ENTRY(startup_kdump)
xc 0x300(256),0x300
xc 0xe00(256),0xe00
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)
# 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
.asciz "The Linux kernel requires more recent processor hardware"
......@@ -424,33 +429,42 @@ ENTRY(startup_kdump)
.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
#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
#ifdef CONFIG_64BIT
......@@ -459,14 +473,14 @@ ENTRY(startup_kdump)
jg startup_continue
/* 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
.align 8
5: .long 0x7fffffff,0xffffffff
6: .long 0x7fffffff,0xffffffff
#include "head_kdump.S"
......@@ -1006,6 +1006,9 @@ static void __init setup_hwcaps(void)
case 0x2818:
strcpy(elf_platform, "z196");
case 0x2827:
strcpy(elf_platform, "zEC12");
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