commit 4e23eb631c84090d2122a0f8c4a331b8e0ba0d99
author Florian Fainelli <f.fainelli@gmail.com> Wed Sep 11 11:51:41 2013 +0100
committer Ralf Baechle <ralf@linux-mips.org> Tue Oct 29 21:24:28 2013 +0100
tree 0ed81e2bca50f3badeadefb2f4352f1dfcffc13e
parent 26fca83a22f66e2ea0339e6b1ee1bdc628c1508b

MIPS: ZBOOT: Support XZ compression scheme

Add support for the XZ compression scheme in the ZBOOT decompression
stub, in order to support it we need to:

- select the "xzkern" compression tool to compress the vmlinux.bin
  payload
- link with ashldi3.o for xz_dec_run() to work
- memcpy() is also required for decompress_unxz.c so we share the
  implementation between GZIP and XZ

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: blogic@openwrt.org
Cc: james.hogan@imgtec.com
Patchwork: https://patchwork.linux-mips.org/patch/5818/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c35603b..a749def 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1491,6 +1491,7 @@
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_LZMA
 	select HAVE_KERNEL_LZO
+	select HAVE_KERNEL_XZ
 
 config SYS_SUPPORTS_ZBOOT_UART16550
 	bool

arch/mips/boot/compressed/Makefile

diff --git a/arch/mips/boot/compressed/Makefile b/arch/mips/boot/compressed/Makefile
index 0048c08..c1f8f07 100644
--- a/arch/mips/boot/compressed/Makefile
+++ b/arch/mips/boot/compressed/Makefile
@@ -37,6 +37,10 @@
 vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY)		   += $(obj)/uart-alchemy.o
 endif
 
+ifdef CONFIG_KERNEL_XZ
+vmlinuzobjs-y += $(obj)/../../lib/ashldi3.o
+endif
+
 targets += vmlinux.bin
 OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
 $(obj)/vmlinux.bin: $(KBUILD_IMAGE) FORCE
@@ -46,6 +50,7 @@
 tool_$(CONFIG_KERNEL_BZIP2)   = bzip2
 tool_$(CONFIG_KERNEL_LZMA)    = lzma
 tool_$(CONFIG_KERNEL_LZO)     = lzo
+tool_$(CONFIG_KERNEL_XZ)      = xzkern
 
 targets += vmlinux.bin.z
 $(obj)/vmlinux.bin.z: $(obj)/vmlinux.bin FORCE

arch/mips/boot/compressed/decompress.c

diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
index 2c95730..cff7b7d 100644
--- a/arch/mips/boot/compressed/decompress.c
+++ b/arch/mips/boot/compressed/decompress.c
@@ -43,7 +43,7 @@
 /* activate the code for pre-boot environment */
 #define STATIC static
 
-#ifdef CONFIG_KERNEL_GZIP
+#if defined(CONFIG_KERNEL_GZIP) || defined(CONFIG_KERNEL_XZ)
 void *memcpy(void *dest, const void *src, size_t n)
 {
 	int i;
@@ -54,6 +54,8 @@
 		d[i] = s[i];
 	return dest;
 }
+#endif
+#ifdef CONFIG_KERNEL_GZIP
 #include "../../../../lib/decompress_inflate.c"
 #endif
 
@@ -78,6 +80,10 @@
 #include "../../../../lib/decompress_unlzo.c"
 #endif
 
+#ifdef CONFIG_KERNEL_XZ
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
 void decompress_kernel(unsigned long boot_heap_start)
 {
 	unsigned long zimage_start, zimage_size;