[RFC/PATCH 13/17][Kdump] Retrieve elfcorehdr address from commandline

[Vivek Goyal]

> --- Begin Message ---
> From: "Vivek Goyal" <vgoyal@xxxxxxxxxx>
>
> o This patch adds support for retrieving the address of elf core header if one
>   is passed in command line.
>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
> ---
>
>  linux-2.6.12-rc1-mm1-1M-root/Documentation/kernel-parameters.txt |    4 ++++
>  linux-2.6.12-rc1-mm1-1M-root/arch/i386/kernel/setup.c            |    8 ++++++++
>  linux-2.6.12-rc1-mm1-1M-root/include/linux/crash_dump.h          |    1 +
>  linux-2.6.12-rc1-mm1-1M-root/kernel/crash_dump.c                 |    3 +++
>  4 files changed, 16 insertions(+)
>
> diff -puN arch/i386/kernel/setup.c~crashdump-x86-retrieve-elfcorehdr-addr arch/i386/kernel/setup.c
> --- linux-2.6.12-rc1-mm1-1M/arch/i386/kernel/setup.c~crashdump-x86-retrieve-elfcorehdr-addr	2005-03-22 16:17:00.000000000 +0530
> +++ linux-2.6.12-rc1-mm1-1M-root/arch/i386/kernel/setup.c	2005-03-22 16:17:00.000000000 +0530
> @@ -42,6 +42,7 @@
>  #include <linux/edd.h>
>  #include <linux/nodemask.h>
>  #include <linux/kexec.h>
> +#include <linux/crash_dump.h>
>  
>  #include <video/edid.h>
>  
> @@ -860,6 +861,13 @@ static void __init parse_cmdline_early (
>  			}
>  		}
>  #endif
> +#ifdef CONFIG_CRASH_DUMP
> +		/* elfcorehdr= specifies the location of elf core header
> +		 * stored by the crashed kernel.
> +		 */
> +		else if (!memcmp(from, "elfcorehdr=", 11))
> +			elfcorehdr_addr = memparse(from+11, &from);
> +#endif
>  
>  		/*
>  		 * highmem=size forces highmem to be exactly 'size' bytes.
> diff -puN Documentation/kernel-parameters.txt~crashdump-x86-retrieve-elfcorehdr-addr Documentation/kernel-parameters.txt
> --- linux-2.6.12-rc1-mm1-1M/Documentation/kernel-parameters.txt~crashdump-x86-retrieve-elfcorehdr-addr	2005-03-22 16:17:00.000000000 +0530
> +++ linux-2.6.12-rc1-mm1-1M-root/Documentation/kernel-parameters.txt	2005-03-22 16:17:00.000000000 +0530
> @@ -455,6 +455,10 @@ running once the system is up.
>  			Format: {"as"|"cfq"|"deadline"|"noop"}
>  			See Documentation/block/as-iosched.txt
>  			and Documentation/block/deadline-iosched.txt for details.
> +	elfcorehdr=	[IA-32]
> +			Specifies physical address of start of kernel core image
> +			elf header.
> +			See Documentation/kdump.txt for details.
>  
>  	enforcing	[SELINUX] Set initial enforcing status.
>  			Format: {"0" | "1"}
> diff -puN include/linux/crash_dump.h~crashdump-x86-retrieve-elfcorehdr-addr include/linux/crash_dump.h
> --- linux-2.6.12-rc1-mm1-1M/include/linux/crash_dump.h~crashdump-x86-retrieve-elfcorehdr-addr	2005-03-22 16:17:00.000000000 +0530
> +++ linux-2.6.12-rc1-mm1-1M-root/include/linux/crash_dump.h	2005-03-22 16:17:00.000000000 +0530
> @@ -7,6 +7,7 @@
>  #include <linux/device.h>
>  #include <linux/proc_fs.h>
>  
> +extern unsigned long long elfcorehdr_addr;
>  extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
>  						unsigned long, int);
>  #endif /* CONFIG_CRASH_DUMP */
> diff -puN kernel/crash_dump.c~crashdump-x86-retrieve-elfcorehdr-addr kernel/crash_dump.c
> --- linux-2.6.12-rc1-mm1-1M/kernel/crash_dump.c~crashdump-x86-retrieve-elfcorehdr-addr	2005-03-22 16:17:00.000000000 +0530
> +++ linux-2.6.12-rc1-mm1-1M-root/kernel/crash_dump.c	2005-03-22 16:17:00.000000000 +0530
> @@ -15,6 +15,9 @@
>  #include <asm/io.h>
>  #include <asm/uaccess.h>
>  
> +/* Stores the physical address of elf header of crash image. */
> +unsigned long long elfcorehdr_addr;
> +
>  /*
>   * Copy a page from "oldmem". For this page, there is no pte mapped
>   * in the current kernel. We stitch up a pte, similar to kmap_atomic.
> _
>
> --- End Message ---