diff options
| author | Lasse Collin <lasse.collin@tukaani.org> | 2011-01-12 17:01:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 08:03:25 -0800 |
| commit | 303148045aac34b70db722a54e5ad94a3a6625c6 (patch) | |
| tree | 9be64b5d44cbef232daf11a89107772cb21647de /arch | |
| parent | 3ebe12439ba7fc62e1d6ecb569b7287771716ca1 (diff) | |
x86: support XZ-compressed kernel
This integrates the XZ decompression code to the x86 pre-boot code.
mkpiggy.c is updated to reserve about 32 KiB more buffer safety margin for
kernel decompression. It is done unconditionally for all decompressors to
keep the code simpler.
The XZ decompressor needs around 30 KiB of heap, so the heap size is
increased to 32 KiB on both x86-32 and x86-64.
Documentation/x86/boot.txt is updated to list the XZ magic number.
With the x86 BCJ filter in XZ, XZ-compressed x86 kernel tends to be a few
percent smaller than the equivalent LZMA-compressed kernel.
Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/Makefile | 5 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/misc.c | 4 | ||||
| -rw-r--r-- | arch/x86/boot/compressed/mkpiggy.c | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/boot.h | 6 |
5 files changed, 11 insertions, 7 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 8734db3c583..6e15fa9455e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -51,6 +51,7 @@ config X86 select HAVE_KERNEL_GZIP select HAVE_KERNEL_BZIP2 select HAVE_KERNEL_LZMA + select HAVE_KERNEL_XZ select HAVE_KERNEL_LZO select HAVE_HW_BREAKPOINT select HAVE_MIXED_BREAKPOINTS_REGS diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile index 0c229551eea..09664efb9ce 100644 --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -4,7 +4,7 @@ # create a compressed vmlinux image from the original vmlinux # -targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma vmlinux.bin.lzo head_$(BITS).o misc.o string.o cmdline.o early_serial_console.o piggy.o +targets := vmlinux.lds vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma vmlinux.bin.xz vmlinux.bin.lzo head_$(BITS).o misc.o string.o cmdline.o early_serial_console.o piggy.o KBUILD_CFLAGS := -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 KBUILD_CFLAGS += -fno-strict-aliasing -fPIC @@ -49,12 +49,15 @@ $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE $(call if_changed,bzip2) $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE $(call if_changed,lzma) +$(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE + $(call if_changed,xzkern) $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE $(call if_changed,lzo) suffix-$(CONFIG_KERNEL_GZIP) := gz suffix-$(CONFIG_KERNEL_BZIP2) := bz2 suffix-$(CONFIG_KERNEL_LZMA) := lzma +suffix-$(CONFIG_KERNEL_XZ) := xz suffix-$(CONFIG_KERNEL_LZO) := lzo quiet_cmd_mkpiggy = MKPIGGY $@ diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 325c05294fc..3a19d04cebe 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -139,6 +139,10 @@ static int lines, cols; #include "../../../../lib/decompress_unlzma.c" #endif +#ifdef CONFIG_KERNEL_XZ +#include "../../../../lib/decompress_unxz.c" +#endif + #ifdef CONFIG_KERNEL_LZO #include "../../../../lib/decompress_unlzo.c" #endif diff --git a/arch/x86/boot/compressed/mkpiggy.c b/arch/x86/boot/compressed/mkpiggy.c index 5c228129d17..646aa78ba5f 100644 --- a/arch/x86/boot/compressed/mkpiggy.c +++ b/arch/x86/boot/compressed/mkpiggy.c @@ -74,7 +74,7 @@ int main(int argc, char *argv[]) offs = (olen > ilen) ? olen - ilen : 0; offs += olen >> 12; /* Add 8 bytes for each 32K block */ - offs += 32*1024 + 18; /* Add 32K + 18 bytes slack */ + offs += 64*1024 + 128; /* Add 64K + 128 bytes slack */ offs = (offs+4095) & ~4095; /* Round to a 4K boundary */ printf(".section \".rodata..compressed\",\"a\",@progbits\n"); diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h index 3b62ab56c7a..5e1a2eef3e7 100644 --- a/arch/x86/include/asm/boot.h +++ b/arch/x86/include/asm/boot.h @@ -32,11 +32,7 @@ #define BOOT_HEAP_SIZE 0x400000 #else /* !CONFIG_KERNEL_BZIP2 */ -#ifdef CONFIG_X86_64 -#define BOOT_HEAP_SIZE 0x7000 -#else -#define BOOT_HEAP_SIZE 0x4000 -#endif +#define BOOT_HEAP_SIZE 0x8000 #endif /* !CONFIG_KERNEL_BZIP2 */ |