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authorVivek Goyal <vgoyal@in.ibm.com>2006-12-07 02:14:04 +0100
committerAndi Kleen <andi@basil.nowhere.org>2006-12-07 02:14:04 +0100
commite69f202d0a1419219198566e1c22218a5c71a9a6 (patch)
tree16bb59505500797e1ea7e09ee9c3b495ce65b76a /include/asm-i386
parent6a044b3a0a1829ef19bb29548ffe553f48e8d80c (diff)
downloadop-kernel-dev-e69f202d0a1419219198566e1c22218a5c71a9a6.zip
op-kernel-dev-e69f202d0a1419219198566e1c22218a5c71a9a6.tar.gz
[PATCH] i386: Implement CONFIG_PHYSICAL_ALIGN
o Now CONFIG_PHYSICAL_START is being replaced with CONFIG_PHYSICAL_ALIGN. Hardcoding the kernel physical start value creates a problem in relocatable kernel context due to boot loader limitations. For ex, if somebody compiles a relocatable kernel to be run from address 4MB, but this kernel will run from location 1MB as grub loads the kernel at physical address 1MB. Kernel thinks that I am a relocatable kernel and I should run from the address I have been loaded at. So somebody wanting to run kernel from 4MB alignment location (for improved performance regions) can't do that. o Hence, Eric proposed that probably CONFIG_PHYSICAL_ALIGN will make more sense in relocatable kernel context. At run time kernel will move itself to a physical addr location which meets user specified alignment restrictions. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/asm-i386')
-rw-r--r--include/asm-i386/boot.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/asm-i386/boot.h b/include/asm-i386/boot.h
index 96b228e..8ce79a6 100644
--- a/include/asm-i386/boot.h
+++ b/include/asm-i386/boot.h
@@ -12,4 +12,8 @@
#define EXTENDED_VGA 0xfffe /* 80x50 mode */
#define ASK_VGA 0xfffd /* ask for it at bootup */
-#endif
+/* Physical address where kenrel should be loaded. */
+#define LOAD_PHYSICAL_ADDR ((0x100000 + CONFIG_PHYSICAL_ALIGN - 1) \
+ & ~(CONFIG_PHYSICAL_ALIGN - 1))
+
+#endif /* _LINUX_BOOT_H */
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