0f890c8d20
The current implementation of CONFIG_RELOCATABLE in BookE is based on mapping the page aligned kernel load address to KERNELBASE. This approach however is not enough for platforms, where the TLB page size is large (e.g, 256M on 44x). So we are renaming the RELOCATABLE used currently in BookE to DYNAMIC_MEMSTART to reflect the actual method. The CONFIG_RELOCATABLE for PPC32(BookE) based on processing of the dynamic relocations will be introduced in the later in the patch series. This change would allow the use of the old method of RELOCATABLE for platforms which can afford to enforce the page alignment (platforms with smaller TLB size). Changes since v3: * Introduced a new config, NONSTATIC_KERNEL, to denote a kernel which is either a RELOCATABLE or DYNAMIC_MEMSTART(Suggested by: Josh Boyer) Suggested-by: Scott Wood <scottwood@freescale.com> Tested-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com> Cc: Scott Wood <scottwood@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Josh Boyer <jwboyer@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linux ppc dev <linuxppc-dev@lists.ozlabs.org> Signed-off-by: Josh Boyer <jwboyer@gmail.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef _PPC64_KDUMP_H
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#define _PPC64_KDUMP_H
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#include <asm/page.h>
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#define KDUMP_KERNELBASE 0x2000000
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/* How many bytes to reserve at zero for kdump. The reserve limit should
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* be greater or equal to the trampoline's end address.
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* Reserve to the end of the FWNMI area, see head_64.S */
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#define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
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#ifdef CONFIG_CRASH_DUMP
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/*
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* On PPC64 translation is disabled during trampoline setup, so we use
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* physical addresses. Though on PPC32 translation is already enabled,
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* so we can't do the same. Luckily create_trampoline() creates relative
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* branches, so we can just add the PAGE_OFFSET and don't worry about it.
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*/
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#ifdef __powerpc64__
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#define KDUMP_TRAMPOLINE_START 0x0100
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#define KDUMP_TRAMPOLINE_END 0x3000
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#else
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#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
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#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
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#endif /* __powerpc64__ */
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#define KDUMP_MIN_TCE_ENTRIES 2048
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#endif /* CONFIG_CRASH_DUMP */
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#ifndef __ASSEMBLY__
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#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
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extern void reserve_kdump_trampoline(void);
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extern void setup_kdump_trampoline(void);
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#else
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/* !CRASH_DUMP || !NONSTATIC_KERNEL */
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static inline void reserve_kdump_trampoline(void) { ; }
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static inline void setup_kdump_trampoline(void) { ; }
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __PPC64_KDUMP_H */
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