bzip2/lzma: x86 kernel compression support

Impact: Replaces x86 kernel decompressor with new code

This is the third part of the bzip2/lzma patch

The bzip patch is based on an idea by Christian Ludwig, includes support for
compressing the kernel with bzip2 or lzma rather than gzip. Both
compressors give smaller sizes than gzip.  Lzma's decompresses faster
than bzip2.

It also supports ramdisks and initramfs' compressed using these two
compressors.

The functionality has been successfully used for a couple of years by
the udpcast project

This version applies to "tip" kernel 2.6.28

This part contains:
- support for new bzip2 and lzma kernel compression for x86

Signed-off-by: Alain Knaff <alain@knaff.lu>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h
index dd61616cb73d..c0e8e68a31fb 100644
--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -15,11 +15,21 @@
                                 + (CONFIG_PHYSICAL_ALIGN - 1)) \
                                 & ~(CONFIG_PHYSICAL_ALIGN - 1))
 
+#if (defined CONFIG_KERNEL_BZIP2)
+#define BOOT_HEAP_SIZE             0x400000
+#else
+
 #ifdef CONFIG_X86_64
 #define BOOT_HEAP_SIZE  0x7000
-#define BOOT_STACK_SIZE 0x4000
 #else
 #define BOOT_HEAP_SIZE  0x4000
+#endif
+
+#endif
+
+#ifdef CONFIG_X86_64
+#define BOOT_STACK_SIZE 0x4000
+#else
 #define BOOT_STACK_SIZE 0x1000
 #endif