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[PATCH] kexec: x86_64: add CONFIG_PHYSICAL_START

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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>
This commit is contained in:
Eric W. Biederman
2005-06-25 14:57:52 -07:00
committed by Linus Torvalds
parent 8a9190853c
commit d0537508a9
5 changed files with 32 additions and 17 deletions
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include/asm-x86_64/page.h
+4 -2
View File
@@ -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__ */