43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _X86_CRASH_CORE_H
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#define _X86_CRASH_CORE_H
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/* 16M alignment for crash kernel regions */
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#define CRASH_ALIGN SZ_16M
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/*
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* Keep the crash kernel below this limit.
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*
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* Earlier 32-bits kernels would limit the kernel to the low 512 MB range
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* due to mapping restrictions.
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*
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* 64-bit kdump kernels need to be restricted to be under 64 TB, which is
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* the upper limit of system RAM in 4-level paging mode. Since the kdump
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* jump could be from 5-level paging to 4-level paging, the jump will fail if
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* the kernel is put above 64 TB, and during the 1st kernel bootup there's
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* no good way to detect the paging mode of the target kernel which will be
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* loaded for dumping.
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*/
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extern unsigned long swiotlb_size_or_default(void);
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#ifdef CONFIG_X86_32
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# define CRASH_ADDR_LOW_MAX SZ_512M
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# define CRASH_ADDR_HIGH_MAX SZ_512M
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#else
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# define CRASH_ADDR_LOW_MAX SZ_4G
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# define CRASH_ADDR_HIGH_MAX SZ_64T
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#endif
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# define DEFAULT_CRASH_KERNEL_LOW_SIZE crash_low_size_default()
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static inline unsigned long crash_low_size_default(void)
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{
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#ifdef CONFIG_X86_64
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return max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
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#else
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return 0;
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#endif
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}
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#endif /* _X86_CRASH_CORE_H */
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