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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 /arch/x86_64/kernel/head.S
parent8a9190853c34289d9181acd9c620c76143bf88ca (diff)
[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 'arch/x86_64/kernel/head.S')
-rw-r--r--arch/x86_64/kernel/head.S18
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 9bd2e7a4b81..8d765aa77a2 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -248,23 +248,23 @@ ENTRY(_stext)
*/
.org 0x1000
ENTRY(init_level4_pgt)
- .quad 0x0000000000102007 /* -> level3_ident_pgt */
+ .quad 0x0000000000002007 + __PHYSICAL_START /* -> level3_ident_pgt */
.fill 255,8,0
- .quad 0x000000000010a007
+ .quad 0x000000000000a007 + __PHYSICAL_START
.fill 254,8,0
/* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
- .quad 0x0000000000103007 /* -> level3_kernel_pgt */
+ .quad 0x0000000000003007 + __PHYSICAL_START /* -> level3_kernel_pgt */
.org 0x2000
ENTRY(level3_ident_pgt)
- .quad 0x0000000000104007
+ .quad 0x0000000000004007 + __PHYSICAL_START
.fill 511,8,0
.org 0x3000
ENTRY(level3_kernel_pgt)
.fill 510,8,0
/* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
- .quad 0x0000000000105007 /* -> level2_kernel_pgt */
+ .quad 0x0000000000005007 + __PHYSICAL_START /* -> level2_kernel_pgt */
.fill 1,8,0
.org 0x4000
@@ -337,17 +337,17 @@ ENTRY(empty_bad_pmd_table)
.org 0xa000
ENTRY(level3_physmem_pgt)
- .quad 0x0000000000105007 /* -> level2_kernel_pgt (so that __va works even before pagetable_init) */
+ .quad 0x0000000000005007 + __PHYSICAL_START /* -> level2_kernel_pgt (so that __va works even before pagetable_init) */
.org 0xb000
#ifdef CONFIG_ACPI_SLEEP
ENTRY(wakeup_level4_pgt)
- .quad 0x0000000000102007 /* -> level3_ident_pgt */
+ .quad 0x0000000000002007 + __PHYSICAL_START /* -> level3_ident_pgt */
.fill 255,8,0
- .quad 0x000000000010a007
+ .quad 0x000000000000a007 + __PHYSICAL_START
.fill 254,8,0
/* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
- .quad 0x0000000000103007 /* -> level3_kernel_pgt */
+ .quad 0x0000000000003007 + __PHYSICAL_START /* -> level3_kernel_pgt */
#endif
.data