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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2018-06-13 00:00:25 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2018-06-25 10:14:40 +0200 |
| commit | 89b5202e81df9f0f0f0a11cf8c78bc8bfdc52a21 (patch) | |
| tree | 547dbff5b9d5eb829827cb9f9c50f44f9bf47e5a /arch/s390/boot/compressed | |
| parent | init/Kconfig: add an option for uncompressed kernel (diff) | |
| download | linux-dev-89b5202e81df9f0f0f0a11cf8c78bc8bfdc52a21.tar.xz linux-dev-89b5202e81df9f0f0f0a11cf8c78bc8bfdc52a21.zip | |
s390/decompressor: support uncompressed kernel
Implement uncompressed kernel support (when "None" is picked in kernel
compression mode list). In that case an actual decompression code is
skipped and control is passed from boot/head.S to startup_continue in
kernel/head64.S. To achieve that uncompressed kernel payload is
conditionally put at 0x100000 in bzImage.
In reality this is very close to classic uncompressed kernel "image",
but the decompressor has its own build and link process,
kernel/head64.S lives at 0x100000 rather than at 0x11000, and .bss
section is reused for both stages.
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>
Diffstat (limited to 'arch/s390/boot/compressed')
| -rw-r--r-- | arch/s390/boot/compressed/Makefile | 4 | ||||
| -rw-r--r-- | arch/s390/boot/compressed/vmlinux.lds.S | 12 | ||||
| -rw-r--r-- | arch/s390/boot/compressed/vmlinux.scr.lds.S | 4 |
3 files changed, 14 insertions, 6 deletions
diff --git a/arch/s390/boot/compressed/Makefile b/arch/s390/boot/compressed/Makefile index 438e1a50e0b5..9d3bd7d066e9 100644 --- a/arch/s390/boot/compressed/Makefile +++ b/arch/s390/boot/compressed/Makefile @@ -9,10 +9,10 @@ KCOV_INSTRUMENT := n GCOV_PROFILE := n UBSAN_SANITIZE := n -obj-y := head.o misc.o piggy.o +obj-y := $(if $(CONFIG_KERNEL_UNCOMPRESSED),,head.o misc.o) piggy.o 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 += vmlinux.scr.lds sizes.h $(obj-y) +targets += vmlinux.scr.lds $(obj-y) $(if $(CONFIG_KERNEL_UNCOMPRESSED),,sizes.h) KBUILD_AFLAGS := $(KBUILD_AFLAGS_DECOMPRESSOR) KBUILD_CFLAGS := $(KBUILD_CFLAGS_DECOMPRESSOR) diff --git a/arch/s390/boot/compressed/vmlinux.lds.S b/arch/s390/boot/compressed/vmlinux.lds.S index d43c2db12d30..b8572a81be5f 100644 --- a/arch/s390/boot/compressed/vmlinux.lds.S +++ b/arch/s390/boot/compressed/vmlinux.lds.S @@ -23,13 +23,10 @@ SECTIONS *(.text.*) _etext = . ; } - .rodata.compressed : { - *(.rodata.compressed) - } .rodata : { _rodata = . ; *(.rodata) /* read-only data */ - *(.rodata.*) + EXCLUDE_FILE (*piggy.o) *(.rodata.*) _erodata = . ; } .data : { @@ -38,6 +35,13 @@ SECTIONS *(.data.*) _edata = . ; } + startup_continue = 0x100000; +#ifdef CONFIG_KERNEL_UNCOMPRESSED + . = 0x100000; +#endif + .rodata.compressed : { + *(.rodata.compressed) + } . = ALIGN(256); .bss : { _bss = . ; diff --git a/arch/s390/boot/compressed/vmlinux.scr.lds.S b/arch/s390/boot/compressed/vmlinux.scr.lds.S index 42a242597f34..ff01d18c9222 100644 --- a/arch/s390/boot/compressed/vmlinux.scr.lds.S +++ b/arch/s390/boot/compressed/vmlinux.scr.lds.S @@ -2,10 +2,14 @@ SECTIONS { .rodata.compressed : { +#ifndef CONFIG_KERNEL_UNCOMPRESSED input_len = .; LONG(input_data_end - input_data) input_data = .; +#endif *(.data) +#ifndef CONFIG_KERNEL_UNCOMPRESSED output_len = . - 4; input_data_end = .; +#endif } } |