linux-kernel - [PATCH 2/2] x86: Add support for uncompressed kernel images

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Message-Id: <1384768311-8824-2-git-send-email-christian.ruppert@abilis.com>
Date:	Mon, 18 Nov 2013 10:51:51 +0100
From:	Christian Ruppert <christian.ruppert@...lis.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Roskin <proski@....org>, Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sam Ravnborg <sam@...nborg.org>, Noam Camus <noamc@...hip.com>,
	Joe Perches <joe@...ches.com>,
	Christian Ruppert <christian.ruppert@...lis.com>
Subject: [PATCH 2/2] x86: Add support for uncompressed kernel images

Signed-off-by: Christian Ruppert <christian.ruppert@...lis.com>
---
 arch/x86/Kconfig                  |    1 +
 arch/x86/boot/compressed/Makefile |   14 ++++++------
 arch/x86/boot/compressed/misc.c   |    4 +++
 lib/decompress_copy.c             |   44 +++++++++++++++++++++++++++++++++++++
 4 files changed, 56 insertions(+), 7 deletions(-)
 create mode 100644 lib/decompress_copy.c

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e903c71..009349f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -62,6 +62,7 @@ config X86
 	select USER_STACKTRACE_SUPPORT
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_DMA_API_DEBUG
+	select HAVE_KERNEL_UNCOMPRESSED
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_LZMA
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index dcd90df..f65e444 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -67,16 +67,16 @@ $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE
 $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE
 	$(call if_changed,lz4)
 
-suffix-$(CONFIG_KERNEL_GZIP)	:= gz
-suffix-$(CONFIG_KERNEL_BZIP2)	:= bz2
-suffix-$(CONFIG_KERNEL_LZMA)	:= lzma
-suffix-$(CONFIG_KERNEL_XZ)	:= xz
-suffix-$(CONFIG_KERNEL_LZO) 	:= lzo
-suffix-$(CONFIG_KERNEL_LZ4) 	:= lz4
+suffix-$(CONFIG_KERNEL_GZIP)	:= .gz
+suffix-$(CONFIG_KERNEL_BZIP2)	:= .bz2
+suffix-$(CONFIG_KERNEL_LZMA)	:= .lzma
+suffix-$(CONFIG_KERNEL_XZ)	:= .xz
+suffix-$(CONFIG_KERNEL_LZO) 	:= .lzo
+suffix-$(CONFIG_KERNEL_LZ4) 	:= .lz4
 
 quiet_cmd_mkpiggy = MKPIGGY $@
       cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false )
 
 targets += piggy.S
-$(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE
+$(obj)/piggy.S: $(obj)/vmlinux.bin$(suffix-y) $(obj)/mkpiggy FORCE
 	$(call if_changed,mkpiggy)
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 434f077..c210314 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -149,6 +149,10 @@ static int lines, cols;
 #include "../../../../lib/decompress_unlz4.c"
 #endif
 
+#ifdef CONFIG_KERNEL_UNCOMPRESSED
+#include "../../../../lib/decompress_copy.c"
+#endif
+
 static void scroll(void)
 {
 	int i;
diff --git a/lib/decompress_copy.c b/lib/decompress_copy.c
new file mode 100644
index 0000000..109ef22
--- /dev/null
+++ b/lib/decompress_copy.c
@@ -0,0 +1,44 @@
+#include <linux/decompress/mm.h>
+
+#define NOZIP_BUFSZ (16 * 1024)
+STATIC int INIT nozip(unsigned char *buf, int len,
+			int(*fill)(void*, unsigned int),
+			int(*flush)(void*, unsigned int),
+			unsigned char *outbuf,
+			int *pos,
+			void(*error)(char *x))
+{
+	char *b;
+
+	if (buf)
+		b = buf;
+	else
+		b = malloc(NOZIP_BUFSZ);
+
+	if (!b) {
+		error("Out of memory while allocating buffer");
+		return -1;
+	}
+
+	if (flush) {
+		if (!len)
+			len = fill(b, NOZIP_BUFSZ);
+
+		len = flush(b, len);
+	} else {
+		if (!len)
+			len = fill(outbuf, NOZIP_BUFSZ);
+		else
+			memcpy(outbuf, b, len);
+	}
+
+	if (pos)
+		*pos = len;
+
+	if (!buf)
+		free(b);
+
+	return 0;
+}
+
+#define decompress nozip
-- 
1.7.1

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