Routines for copying dump pages
PATCH 10/17 Routines for copying dump pages
From: "Vivek Goyal" <[email protected]>
o Moved architecture independent crash_dump.c and crash_dump.h file creation code from crashdump-memory-preserving-reboot-using-kexec.patch to here. This makes more logical sense.
From: "Eric W. Biederman" <[email protected]>
kernel/crash.c has been renamed kernel/crash_dump.c to clarify it's purpose.
From: Hariprasad Nellitheertha <[email protected]>
This patch provides the interfaces necessary to read the dump contents, treating it as a high memory device.
Signed off by Hariprasad Nellitheertha <[email protected]>
Signed-off-by Eric Biederman <[email protected]>
Signed-off-by Vivek Goyal <[email protected]>
---
linux-2.6.12-rc1-mm1-1M-root/arch/i386/mm/highmem.c | 18 ++++++ linux-2.6.12-rc1-mm1-1M-root/include/asm-i386/highmem.h | 1 linux-2.6.12-rc1-mm1-1M-root/include/linux/crash_dump.h | 12 ++++ linux-2.6.12-rc1-mm1-1M-root/include/linux/highmem.h | 1 linux-2.6.12-rc1-mm1-1M-root/kernel/Makefile | 1 linux-2.6.12-rc1-mm1-1M-root/kernel/crash_dump.c | 46 ++++++++++++++++ 6 files changed, 79 insertions(+)
arch/i386/mm/highmem.c renamed from arch/i386/mm/highmem.c~crashdump-routines-for-copying-dump-pages +18 -0
@@ -74,6 +74,24 @@ void kunmap_atomic(void *kvaddr, enum kmpreempt_check_resched (); } +/* This is the same as kmap_atomic() but can map memory that doesn't +* have a struct page associated with it. +*/ +void *kmap_atomic_pfn (unsigned long pfn,enum km_type type) +{ +enum fixed_addresses idx; +unsigned long vaddr; + +inc_preempt_count (); + + idx = type +KM_TYPE_NR *smp_processor_id (); + vaddr =__fix_to_virt (FIX_KMAP_BEGIN + idx); +set_pte (kmap_pte-idx,pfn_pte (pfn, kmap_prot)); +__flush_tlb_one (vaddr); + +return (void *) vaddr; +} +struct page *kmap_atomic_to_page (void *ptr) {unsigned long idx, vaddr = (unsigned long )ptr;
include/asm-i386/highmem.h renamed from include/asm-i386/highmem.h~crashdump-routines-for-copying-dump-pages +1 -0
@@ -70,6 +70,7 @@ void *kmap(struct page *page);void kunmap (struct page *page);void *kmap_atomic (struct page *page,enum km_type type);void kunmap_atomic (void *kvaddr,enum km_type type); +void *kmap_atomic_pfn (unsigned long pfn,enum km_type type);struct page *kmap_atomic_to_page (void *ptr);#define flush_cache_kmaps () do { } while (0)
include/linux/crash_dump.h new file +12 -0
@@ -0,0 +1,12 @@ +#ifndef LINUX_CRASH_DUMP_H +#define LINUX_CRASH_DUMP_H + +#ifdef CONFIG_CRASH_DUMP +#include <linux/kexec.h> +#include <linux/smp_lock.h> +#include <linux/device.h> +#include <linux/proc_fs.h> + +extern ssize_t copy_oldmem_page (unsigned long ,char *,size_t ,int ); +#endif /* CONFIG_CRASH_DUMP */ +#endif /* LINUX_CRASHDUMP_H */
include/linux/highmem.h renamed from include/linux/highmem.h~crashdump-routines-for-copying-dump-pages +1 -0
@@ -28,6 +28,7 @@ static inline void *kmap(struct page *pa#define kmap_atomic (page, idx) page_address(page)#define kunmap_atomic (addr, idx) do { } while (0) +#define kmap_atomic_pfn (pfn, idx) page_address(pfn_to_page(pfn))#define kmap_atomic_to_page (ptr) virt_to_page(ptr)#endif /* CONFIG_HIGHMEM */
kernel/crash_dump.c new file +46 -0
46 lines not on this page · raw message
kernel/Makefile renamed from kernel/Makefile~crashdump-routines-for-copying-dump-pages +1 -0
@@ -29,6 +29,7 @@ obj-$(CONFIG_KPROBES) += kprobes.o obj-$(CONFIG_SYSFS) += ksysfs.o obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o obj-$(CONFIG_GENERIC_HARDIRQS) += irq/ +obj-$(CONFIG_CRASH_DUMP) += crash_dump.o obj-$(CONFIG_SECCOMP) += seccomp.o ifneq ($(CONFIG_IA64),y)
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