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1a1cf93c20
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
19 lines
624 B
C
19 lines
624 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef _ASM_POWERPC_CRASHDUMP_PPC64_H
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#define _ASM_POWERPC_CRASHDUMP_PPC64_H
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/*
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* Backup region - first 64KB of System RAM
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*
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* If ever the below macros are to be changed, please be judicious.
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* The implicit assumptions are:
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* - start, end & size are less than UINT32_MAX.
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* - start & size are at least 8 byte aligned.
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*
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* For implementation details: arch/powerpc/purgatory/trampoline_64.S
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*/
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#define BACKUP_SRC_START 0
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#define BACKUP_SRC_END 0xffff
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#define BACKUP_SRC_SIZE (BACKUP_SRC_END - BACKUP_SRC_START + 1)
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#endif /* __ASM_POWERPC_CRASHDUMP_PPC64_H */
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