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s390: get rid of the first mb of uncompressed image 

Instead of generating uncompressed kernel image starting at 0, filling
first mb with zeros (with ".org 0x100000") and then trimming it off
from vmlinux.bin before compression, simply generate a kernel image
starting from 0x100000.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
hifive-unleashed-5.1
Vasily Gorbik 2018-06-27 17:10:14 +02:00 committed by Martin Schwidefsky
parent 8e533fdd09
commit 183ab05ff2
3 changed files with 5 additions and 13 deletions
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15
arch/s390/boot/compressed/Makefile
View File

@ -23,16 +23,12 @@ LDFLAGS_vmlinux := --oformat $(LD_BFD) -e startup -T
$(obj)/vmlinux: $(obj)/vmlinux.lds $(objtree)/arch/s390/boot/startup.a $(OBJECTS)
$(call if_changed,ld)
TRIM_HEAD_SIZE := 0x100000
sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 (0x\1 - $(TRIM_HEAD_SIZE))/p'
# extract required uncompressed vmlinux symbols and adjust them to reflect offsets inside vmlinux.bin
sed-sizes := -e 's/^\([0-9a-fA-F]*\) . \(__bss_start\|_end\)$$/\#define SZ\2 (0x\1 - 0x100000)/p'
quiet_cmd_sizes = GEN $@
cmd_sizes = $(NM) $< | sed -n $(sed-sizes) > $@
quiet_cmd_trim_head = TRIM $@
cmd_trim_head = tail -c +$$(($(TRIM_HEAD_SIZE) + 1)) $< > $@
$(obj)/sizes.h: vmlinux
$(call if_changed,sizes)
@ -42,13 +38,10 @@ $(obj)/head.o: $(obj)/sizes.h
CFLAGS_misc.o += -I$(objtree)/$(obj)
$(obj)/misc.o: $(obj)/sizes.h
OBJCOPYFLAGS_vmlinux.bin.full := -R .comment -S
$(obj)/vmlinux.bin.full: vmlinux
OBJCOPYFLAGS_vmlinux.bin := -R .comment -S
$(obj)/vmlinux.bin: vmlinux
$(call if_changed,objcopy)
$(obj)/vmlinux.bin: $(obj)/vmlinux.bin.full
$(call if_changed,trim_head)
vmlinux.bin.all-y := $(obj)/vmlinux.bin
suffix-$(CONFIG_KERNEL_GZIP) := .gz

1
arch/s390/kernel/head64.S
View File

@ -16,7 +16,6 @@
#include <asm/page.h>
__HEAD
.org 0x100000
ENTRY(startup_continue)
tm __LC_STFLE_FAC_LIST+5,0x80 # LPP available ?
jz 0f

2
arch/s390/kernel/vmlinux.lds.S
View File

@ -30,7 +30,7 @@ PHDRS {
SECTIONS
{
. = 0x00000000;
. = 0x100000;
.text : {
/* Text and read-only data */
HEAD_TEXT