Commit 54c32021 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras
Browse files

[PATCH] powerpc: Add arch-dependent copy_oldmem_page 



Signed-off-by: default avatarHaren Myneni <haren@us.ibm.com>
Signed-off-by: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent dcee3036

arch/powerpc/kernel/crash_dump.c

+36 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <asm/kdump.h>

#include <asm/lmb.h>

#include <asm/firmware.h>

#include <asm/uaccess.h>



#ifdef DEBUG

#include <asm/udbg.h>
@@ -71,3 +72,38 @@ static int __init parse_savemaxmem(char *p) 
	return 0;

}

__setup("savemaxmem=", parse_savemaxmem);



/*

 * copy_oldmem_page - copy one page from "oldmem"

 * @pfn: page frame number to be copied

 * @buf: target memory address for the copy; this can be in kernel address

 *      space or user address space (see @userbuf)

 * @csize: number of bytes to copy

 * @offset: offset in bytes into the page (based on pfn) to begin the copy

 * @userbuf: if set, @buf is in user address space, use copy_to_user(),

 *      otherwise @buf is in kernel address space, use memcpy().

 *

 * 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  *vaddr;



	if (!csize)

		return 0;



	vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0);



	if (userbuf) {

		if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) {

			iounmap(vaddr);

			return -EFAULT;

		}

	} else

		memcpy(buf, (vaddr + offset), csize);



	iounmap(vaddr);

	return csize;

}

include/asm-powerpc/kexec.h

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ 
#define KEXEC_ARCH KEXEC_ARCH_PPC

#endif



#define HAVE_ARCH_COPY_OLDMEM_PAGE



#ifndef __ASSEMBLY__



#ifdef CONFIG_KEXEC

kernel/crash_dump.c

+3 −0
Original line number Diff line number Diff line
@@ -14,10 +14,12 @@ 


#include <asm/io.h>

#include <asm/uaccess.h>

#include <asm/kexec.h>



/* Stores the physical address of elf header of crash image. */

unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;



#ifndef HAVE_ARCH_COPY_OLDMEM_PAGE

/**

 * copy_oldmem_page - copy one page from "oldmem"

 * @pfn: page frame number to be copied
@@ -59,3 +61,4 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, 
	kfree(page);

	return csize;

}

#endif