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 <heiko.carstens@de.ibm.com>
parent d1e57508
......@@ -169,6 +169,10 @@ config HAVE_MARCH_Z196_FEATURES
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 @@ 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 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
......
......@@ -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
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 @@ ENTRY(startup_kdump)
.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 @@ ENTRY(startup_kdump)
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"
......
......@@ -1006,6 +1006,9 @@ static void __init setup_hwcaps(void)
case 0x2818:
strcpy(elf_platform, "z196");
break;
case 0x2827:
strcpy(elf_platform, "zEC12");
break;
}
}
......
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