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Commit 398ab1fc authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
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[PATCH] powerpc: Add CONFIG_CRASH_DUMP 



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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 4693c09a

arch/powerpc/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/kernel/setup_64.c

+3 −0
Original line number Diff line number Diff line
@@ -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();

include/asm-powerpc/page.h

+9 −1
Original line number Diff line number Diff line
@@ -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)