mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
666bfddbe8
From: "Vivek Goyal" <vgoyal@in.ibm.com> o Support for /proc/vmcore interface. This interface exports elf core image either in ELF32 or ELF64 format, depending on the format in which elf headers have been stored by crashed kernel. o Added support for CONFIG_VMCORE config option. o Removed the dependency on /proc/kcore. From: "Eric W. Biederman" <ebiederm@xmission.com> This patch has been refactored to more closely match the prevailing style in the affected files. And to clearly indicate the dependency between /proc/kcore and proc/vmcore.c From: Hariprasad Nellitheertha <hari@in.ibm.com> This patch contains the code that provides an ELF format interface to the previous kernel's memory post kexec reboot. Signed off by Hariprasad Nellitheertha <hari@in.ibm.com> Signed-off-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
|
|
* kernel/crash_dump.c - Memory preserving reboot related code.
|
|
*
|
|
* Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
|
|
* Copyright (C) IBM Corporation, 2004. All rights reserved
|
|
*/
|
|
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/crash_dump.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/* Stores the physical address of elf header of crash image. */
|
|
unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
|
|
size_t csize, unsigned long offset, int userbuf)
|
|
{
|
|
void *page, *vaddr;
|
|
|
|
if (!csize)
|
|
return 0;
|
|
|
|
page = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
|
|
copy_page(page, vaddr);
|
|
kunmap_atomic(vaddr, KM_PTE0);
|
|
|
|
if (userbuf) {
|
|
if (copy_to_user(buf, (page + offset), csize)) {
|
|
kfree(page);
|
|
return -EFAULT;
|
|
}
|
|
} else {
|
|
memcpy(buf, (page + offset), csize);
|
|
}
|
|
|
|
kfree(page);
|
|
return csize;
|
|
}
|