From d0537508a9921efced238b20967e50e519ac34af Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Sat, 25 Jun 2005 14:57:52 -0700 Subject: [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-x86_64/page.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include') 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__ */ -- cgit v1.2.3