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[PATCH] powerpc: Add CONFIG_CRASH_DUMP

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This patch adds a Kconfig variable, CONFIG_CRASH_DUMP, which configures the
built kernel for use as a Kdump kernel.

Currently "all" this involves is changing the value of KERNELBASE to 32 MB.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2005-12-04 18:39:23 +11:00 committed by Paul Mackerras
parent 4693c09a47
commit 398ab1fcb9
3 changed files with 23 additions and 1 deletions
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11
arch/powerpc/Kconfig
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@ -379,6 +379,17 @@ config CELL_IIC
bool
default y
config CRASH_DUMP
bool "kernel crash dumps (EXPERIMENTAL)"
depends on PPC_MULTIPLATFORM
depends on EXPERIMENTAL
help
Build a kernel suitable for use as a kdump capture kernel.
The kernel will be linked at a different address than normal, and
so can only be used for Kdump.
Don't change this unless you know what you are doing.
config IBMVIO
depends on PPC_PSERIES || PPC_ISERIES
bool

3
arch/powerpc/kernel/setup_64.c
View File

@ -512,6 +512,9 @@ void __init setup_system(void)
ppc64_caches.iline_size);
printk("htab_address = 0x%p\n", htab_address);
printk("htab_hash_mask = 0x%lx\n", htab_hash_mask);
#if PHYSICAL_START > 0
printk("physical_start = 0x%x\n", PHYSICAL_START);
#endif
printk("-----------------------------------------------------\n");
mm_init_ppc64();

10
include/asm-powerpc/page.h
View File

@ -51,8 +51,16 @@
*
* If you want to test if something's a kernel address, use is_kernel_addr().
*/
#ifdef CONFIG_CRASH_DUMP
/* Kdump kernel runs at 32 MB, change at your peril. */
#define PHYSICAL_START 0x2000000
#else
#define PHYSICAL_START 0x0
#endif
#define PAGE_OFFSET ASM_CONST(CONFIG_KERNEL_START)
#define KERNELBASE PAGE_OFFSET
#define KERNELBASE (PAGE_OFFSET + PHYSICAL_START)
#ifdef CONFIG_DISCONTIGMEM
#define page_to_pfn(page) discontigmem_page_to_pfn(page)