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

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

arch/s390/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/head.S

+44 −30
Original line number Diff line number Diff line
@@ -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"

arch/s390/kernel/setup.c

+3 −0
Original line number Diff line number Diff line
@@ -1006,6 +1006,9 @@ static void __init setup_hwcaps(void) 
	case 0x2818:

		strcpy(elf_platform, "z196");

		break;

	case 0x2827:

		strcpy(elf_platform, "zEC12");

		break;

	}

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE