arm: add support for LZO-compressed kernels

- changes to ach/arch/boot/Makefile to make it easier to add new
   compression types
 - new piggy.lzo.S necessary for lzo compression
 - changes in arch/arm/boot/compressed/misc.c to allow the use of lzo or
   gzip, depending on the config
 - Kconfig support

Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Tested-by: Wu Zhangjin <wuzhangjin@gmail.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Russell King <rmk@arm.linux.org.uk>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 9 deletions

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index ce39dc540085..2d4d88ba73bf 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -63,8 +63,12 @@ endif
 
 SEDFLAGS        = s/TEXT_START/$(ZTEXTADDR)/;s/BSS_START/$(ZBSSADDR)/
 
-targets       := vmlinux vmlinux.lds piggy.gz piggy.o font.o font.c \
-                 head.o misc.o $(OBJS)
+suffix_$(CONFIG_KERNEL_GZIP) = gzip
+suffix_$(CONFIG_KERNEL_LZO)  = lzo
+
+targets       := vmlinux vmlinux.lds \
+                 piggy.$(suffix_y) piggy.$(suffix_y).o \
+                 font.o font.c head.o misc.o $(OBJS)
 
 ifeq ($(CONFIG_FUNCTION_TRACER),y)
 ORIG_CFLAGS := $(KBUILD_CFLAGS)
@@ -87,22 +91,34 @@ endif
 ifneq ($(PARAMS_PHYS),)
 LDFLAGS_vmlinux += --defsym params_phys=$(PARAMS_PHYS)
 endif
-LDFLAGS_vmlinux += -p --no-undefined -X \
-        $(shell $(CC) $(KBUILD_CFLAGS) --print-libgcc-file-name) -T
+# ?
+LDFLAGS_vmlinux += -p
+# Report unresolved symbol references
+LDFLAGS_vmlinux += --no-undefined
+# Delete all temporary local symbols
+LDFLAGS_vmlinux += -X
+# Next argument is a linker script
+LDFLAGS_vmlinux += -T
+
+# For __aeabi_uidivmod
+lib1funcs = $(obj)/lib1funcs.o
+
+$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S FORCE
+        $(call cmd,shipped)
 
 # Don't allow any static data in misc.o, which
 # would otherwise mess up our GOT table
 CFLAGS_misc.o := -Dstatic=
 
-$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
-                $(addprefix $(obj)/, $(OBJS)) FORCE
+$(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.$(suffix_y).o \
+                $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) FORCE
         $(call if_changed,ld)
         @:
 
-$(obj)/piggy.gz: $(obj)/../Image FORCE
-        $(call if_changed,gzip)
+$(obj)/piggy.$(suffix_y): $(obj)/../Image FORCE
+        $(call if_changed,$(suffix_y))
 
-$(obj)/piggy.o:  $(obj)/piggy.gz FORCE
+$(obj)/piggy.$(suffix_y).o:  $(obj)/piggy.$(suffix_y) FORCE
 
 CFLAGS_font.o := -Dstatic=