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authorEric W. Biederman <ebiederm@xmission.com>2005-06-25 14:57:52 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:48 -0700
commitd0537508a9921efced238b20967e50e519ac34af (patch)
tree80f2743e9299da07c07625af45807e16a7d7f85a /include/asm-x86_64
parent8a9190853c34289d9181acd9c620c76143bf88ca (diff)
downloadlinux-d0537508a9921efced238b20967e50e519ac34af.tar.gz
[PATCH] kexec: x86_64: add CONFIG_PHYSICAL_START
For one kernel to report a crash another kernel has created we need to have 2 kernels loaded simultaneously in memory. To accomplish this the two kernels need to built to run at different physical addresses. This patch adds the CONFIG_PHYSICAL_START option to the x86_64 kernel so we can do just that. You need to know what you are doing and the ramifications are before changing this value, and most users won't care so I have made it depend on CONFIG_EMBEDDED bzImage kernels will work and run at a different address when compiled with this option but they will still load at 1MB. If you need a kernel loaded at a different address as well you need to boot a vmlinux. Signed-off-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/page.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index 60130f4ca98..431318764af 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -64,12 +64,14 @@ typedef struct { unsigned long pgprot; } pgprot_t;
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
-#define __START_KERNEL 0xffffffff80100000UL
+#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
+#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
#define __START_KERNEL_map 0xffffffff80000000UL
#define __PAGE_OFFSET 0xffff810000000000UL
#else
-#define __START_KERNEL 0xffffffff80100000
+#define __PHYSICAL_START CONFIG_PHYSICAL_START
+#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
#define __START_KERNEL_map 0xffffffff80000000
#define __PAGE_OFFSET 0xffff810000000000
#endif /* !__ASSEMBLY__ */