diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2020-07-29 17:12:58 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-29 23:47:54 +1000 |
| commit | 1a1cf93c200581c72a3cd521e1e0a1a3b5d0077d (patch) | |
| tree | cb3c966e21b0bd1d04a7d33fa2199d5d1109a2ae /arch/powerpc/include/asm/crashdump-ppc64.h | |
| parent | 7c64e21a1c5a5bcd651d895b8faa68e9cdcc433d (diff) | |
powerpc/kexec_file: Setup backup region for kdump kernel
Though kdump kernel boots from loaded address, the first 64KB of it is
copied down to real 0. So, setup a backup region and let purgatory
copy the first 64KB of crashed kernel into this backup region before
booting into kdump kernel. Update reserve map with backup region and
crashed kernel's memory to avoid kdump kernel from accidentially using
that memory.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/159602294718.575379.16216507537038008623.stgit@hbathini
Diffstat (limited to 'arch/powerpc/include/asm/crashdump-ppc64.h')
| -rw-r--r-- | arch/powerpc/include/asm/crashdump-ppc64.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/crashdump-ppc64.h b/arch/powerpc/include/asm/crashdump-ppc64.h new file mode 100644 index 000000000000..68d9717cc5ee --- /dev/null +++ b/arch/powerpc/include/asm/crashdump-ppc64.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _ASM_POWERPC_CRASHDUMP_PPC64_H +#define _ASM_POWERPC_CRASHDUMP_PPC64_H + +/* + * Backup region - first 64KB of System RAM + * + * If ever the below macros are to be changed, please be judicious. + * The implicit assumptions are: + * - start, end & size are less than UINT32_MAX. + * - start & size are at least 8 byte aligned. + * + * For implementation details: arch/powerpc/purgatory/trampoline_64.S + */ +#define BACKUP_SRC_START 0 +#define BACKUP_SRC_END 0xffff +#define BACKUP_SRC_SIZE (BACKUP_SRC_END - BACKUP_SRC_START + 1) + +#endif /* __ASM_POWERPC_CRASHDUMP_PPC64_H */ |