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authorHeiko Carstens <heiko.carstens@de.ibm.com>2015-02-12 13:08:27 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-03-25 11:49:33 +0100
commit5a79859ae0f35d25c67a03e82bf0c80592f16a39 (patch)
tree37264d49f069812f19ced94e6ae171814fb7e498 /arch/s390/boot
parent1833c9f647e9bda1cd24653ff8f9c207b5f5b911 (diff)
s390: remove 31 bit support
Remove the 31 bit support in order to reduce maintenance cost and effectively remove dead code. Since a couple of years there is no distribution left that comes with a 31 bit kernel. The 31 bit kernel also has been broken since more than a year before anybody noticed. In addition I added a removal warning to the kernel shown at ipl for 5 minutes: a960062e5826 ("s390: add 31 bit warning message") which let everybody know about the plan to remove 31 bit code. We didn't get any response. Given that the last 31 bit only machine was introduced in 1999 let's remove the code. Anybody with 31 bit user space code can still use the compat mode. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/boot')
-rw-r--r--arch/s390/boot/compressed/Makefile12
-rw-r--r--arch/s390/boot/compressed/head31.S51
-rw-r--r--arch/s390/boot/compressed/vmlinux.lds.S5
3 files changed, 5 insertions, 63 deletions
diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile
index f90d1fc6d603..254fb05c5d6c 100644
--- a/arch/s390/boot/compressed/Makefile
+++ b/arch/s390/boot/compressed/Makefile
@@ -4,13 +4,11 @@
# create a compressed vmlinux image from the original vmlinux
#
-BITS := $(if $(CONFIG_64BIT),64,31)
-
targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2
targets += vmlinux.bin.xz vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.lz4
-targets += misc.o piggy.o sizes.h head$(BITS).o
+targets += misc.o piggy.o sizes.h head64.o
-KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2
+KBUILD_CFLAGS := -m64 -D__KERNEL__ $(LINUX_INCLUDE) -O2
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
KBUILD_CFLAGS += $(cflags-y) -fno-delete-null-pointer-checks
KBUILD_CFLAGS += $(call cc-option,-mpacked-stack)
@@ -19,7 +17,7 @@ KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
GCOV_PROFILE := n
OBJECTS := $(addprefix $(objtree)/arch/s390/kernel/, head.o sclp.o ebcdic.o)
-OBJECTS += $(obj)/head$(BITS).o $(obj)/misc.o $(obj)/piggy.o
+OBJECTS += $(obj)/head64.o $(obj)/misc.o $(obj)/piggy.o
LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
$(obj)/vmlinux: $(obj)/vmlinux.lds $(OBJECTS)
@@ -34,8 +32,8 @@ quiet_cmd_sizes = GEN $@
$(obj)/sizes.h: vmlinux
$(call if_changed,sizes)
-AFLAGS_head$(BITS).o += -I$(obj)
-$(obj)/head$(BITS).o: $(obj)/sizes.h
+AFLAGS_head64.o += -I$(obj)
+$(obj)/head64.o: $(obj)/sizes.h
CFLAGS_misc.o += -I$(obj)
$(obj)/misc.o: $(obj)/sizes.h
diff --git a/arch/s390/boot/compressed/head31.S b/arch/s390/boot/compressed/head31.S
deleted file mode 100644
index e8c9e18b8039..000000000000
--- a/arch/s390/boot/compressed/head31.S
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * Startup glue code to uncompress the kernel
- *
- * Copyright IBM Corp. 2010
- *
- * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
- */
-
-#include <linux/init.h>
-#include <linux/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/thread_info.h>
-#include <asm/page.h>
-#include "sizes.h"
-
-__HEAD
-ENTRY(startup_continue)
- basr %r13,0 # get base
-.LPG1:
- # setup stack
- l %r15,.Lstack-.LPG1(%r13)
- ahi %r15,-96
- l %r1,.Ldecompress-.LPG1(%r13)
- basr %r14,%r1
- # setup registers for memory mover & branch to target
- lr %r4,%r2
- l %r2,.Loffset-.LPG1(%r13)
- la %r4,0(%r2,%r4)
- l %r3,.Lmvsize-.LPG1(%r13)
- lr %r5,%r3
- # move the memory mover someplace safe
- la %r1,0x200
- mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13)
- # decompress image is started at 0x11000
- lr %r6,%r2
- br %r1
-mover:
- mvcle %r2,%r4,0
- jo mover
- br %r6
-mover_end:
-
- .align 8
-.Lstack:
- .long 0x8000 + (1<<(PAGE_SHIFT+THREAD_ORDER))
-.Ldecompress:
- .long decompress_kernel
-.Loffset:
- .long 0x11000
-.Lmvsize:
- .long SZ__bss_start
diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S
index 8e1fb8239287..747735f83426 100644
--- a/arch/s390/boot/compressed/vmlinux.lds.S
+++ b/arch/s390/boot/compressed/vmlinux.lds.S
@@ -1,12 +1,7 @@
#include <asm-generic/vmlinux.lds.h>
-#ifdef CONFIG_64BIT
OUTPUT_FORMAT("elf64-s390", "elf64-s390", "elf64-s390")
OUTPUT_ARCH(s390:64-bit)
-#else
-OUTPUT_FORMAT("elf32-s390", "elf32-s390", "elf32-s390")
-OUTPUT_ARCH(s390:31-bit)
-#endif
ENTRY(startup)