add support for and switch to XZ compressed kernels on ARM

SVN-Revision: 27518

target/linux/generic/config-3.0

@@ -1201,9 +1201,9 @@ CONFIG_JOLIET=y
 # CONFIG_KARMA_PARTITION is not set
 # CONFIG_KERNEL_BZIP2 is not set
 # CONFIG_KERNEL_GZIP is not set
-CONFIG_KERNEL_LZMA=y
+# CONFIG_KERNEL_LZMA is not set
 # CONFIG_KERNEL_LZO is not set
-# CONFIG_KERNEL_XZ is not set
+CONFIG_KERNEL_XZ=y
 # CONFIG_KEXEC is not set
 # CONFIG_KEYBOARD_ADP5588 is not set
 # CONFIG_KEYBOARD_ADP5589 is not set

target/linux/generic/patches-3.0/006-arm_kernel_xz_support.patch

@@ -0,0 +1,107 @@
+From 2d303b4683145f7dbc918bd14d04e1396581b2ce Mon Sep 17 00:00:00 2001
+From: Imre Kaloz <kaloz@openwrt.org>
+Date: Thu, 7 Jul 2011 12:05:21 +0200
+Subject: [PATCH] ARM: support XZ compressed kernels
+
+Wire up support for the XZ decompressor
+
+Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
+---
+ arch/arm/Kconfig                        |    1 +
+ arch/arm/boot/compressed/Makefile       |   11 +++++++++--
+ arch/arm/boot/compressed/decompress.c   |    4 ++++
+ arch/arm/boot/compressed/piggy.xzkern.S |    6 ++++++
+ lib/xz/xz_dec_stream.c                  |    1 +
+ 5 files changed, 21 insertions(+), 2 deletions(-)
+ create mode 100644 arch/arm/boot/compressed/piggy.xzkern.S
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index c2e5f3d..489fe16 100644
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -20,6 +20,7 @@ config ARM
+ 	select HAVE_KERNEL_GZIP
+ 	select HAVE_KERNEL_LZO
+ 	select HAVE_KERNEL_LZMA
++	select HAVE_KERNEL_XZ
+ 	select HAVE_IRQ_WORK
+ 	select HAVE_PERF_EVENTS
+ 	select PERF_USE_VMALLOC
+diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
+index 23aad07..e5db34e 100644
+--- a/arch/arm/boot/compressed/Makefile
++++ b/arch/arm/boot/compressed/Makefile
+@@ -82,13 +82,14 @@ SEDFLAGS	= s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
+ suffix_$(CONFIG_KERNEL_GZIP) = gzip
+ suffix_$(CONFIG_KERNEL_LZO)  = lzo
+ suffix_$(CONFIG_KERNEL_LZMA) = lzma
++suffix_$(CONFIG_KERNEL_XZ)   = xzkern
+ 
+ targets       := vmlinux vmlinux.lds \
+ 		 piggy.$(suffix_y) piggy.$(suffix_y).o \
+ 		 font.o font.c head.o misc.o $(OBJS)
+ 
+ # Make sure files are removed during clean
+-extra-y       += piggy.gzip piggy.lzo piggy.lzma lib1funcs.S
++extra-y       += piggy.gzip piggy.lzo piggy.lzma piggy.xzkern lib1funcs.S ashldi3.S
+ 
+ ifeq ($(CONFIG_FUNCTION_TRACER),y)
+ ORIG_CFLAGS := $(KBUILD_CFLAGS)
+@@ -133,8 +134,14 @@ bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
+   ( echo "following symbols must have non local/private scope:" >&2; \
+     echo "$$bad_syms" >&2; rm -f $@; false )
+ 
++# For __aeabi_llsl
++ashldi3 = $(obj)/ashldi3.o
++
++$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S FORCE
++	$(call cmd,shipped)
++
+ $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
+-	 	$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
++	 	$(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) FORCE
+ 	$(call if_changed,ld)
+ 	@$(check_for_bad_syms)
+ 
+diff --git a/arch/arm/boot/compressed/decompress.c b/arch/arm/boot/compressed/decompress.c
+index 07be5a2..0ecd8b4 100644
+--- a/arch/arm/boot/compressed/decompress.c
++++ b/arch/arm/boot/compressed/decompress.c
+@@ -44,6 +44,10 @@ extern void error(char *);
+ #include "../../../../lib/decompress_unlzma.c"
+ #endif
+ 
++#ifdef CONFIG_KERNEL_XZ
++#include "../../../../lib/decompress_unxz.c"
++#endif
++
+ int do_decompress(u8 *input, int len, u8 *output, void (*error)(char *x))
+ {
+ 	return decompress(input, len, NULL, NULL, output, NULL, error);
+diff --git a/arch/arm/boot/compressed/piggy.xzkern.S b/arch/arm/boot/compressed/piggy.xzkern.S
+new file mode 100644
+index 0000000..5703f30
+--- /dev/null
++++ b/arch/arm/boot/compressed/piggy.xzkern.S
+@@ -0,0 +1,6 @@
++	.section .piggydata,#alloc
++	.globl	input_data
++input_data:
++	.incbin	"arch/arm/boot/compressed/piggy.xzkern"
++	.globl	input_data_end
++input_data_end:
+diff --git a/lib/xz/xz_dec_stream.c b/lib/xz/xz_dec_stream.c
+index ac809b1..9a60cc2 100644
+--- a/lib/xz/xz_dec_stream.c
++++ b/lib/xz/xz_dec_stream.c
+@@ -9,6 +9,7 @@
+ 
+ #include "xz_private.h"
+ #include "xz_stream.h"
++#include <linux/kernel.h>
+ 
+ /* Hash used to validate the Index field */
+ struct xz_dec_hash {
+-- 
+1.7.1
+