Release 4.14 arch/powerpc/include/asm/kdump.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PPC64_KDUMP_H

#define _PPC64_KDUMP_H

#include <asm/page.h>


#define KDUMP_KERNELBASE	0x2000000

/* How many bytes to reserve at zero for kdump. The reserve limit should
 * be greater or equal to the trampoline's end address.
 * Reserve to the end of the FWNMI area, see head_64.S */

#define KDUMP_RESERVE_LIMIT	0x10000 
/* 64K */

#ifdef CONFIG_CRASH_DUMP

/*
 * On PPC64 translation is disabled during trampoline setup, so we use
 * physical addresses. Though on PPC32 translation is already enabled,
 * so we can't do the same. Luckily create_trampoline() creates relative
 * branches, so we can just add the PAGE_OFFSET and don't worry about it.
 */
#ifdef __powerpc64__

#define KDUMP_TRAMPOLINE_START	0x0100

#define KDUMP_TRAMPOLINE_END	0x3000
#else

#define KDUMP_TRAMPOLINE_START	(0x0100 + PAGE_OFFSET)

#define KDUMP_TRAMPOLINE_END	(0x3000 + PAGE_OFFSET)
#endif /* __powerpc64__ */


#define KDUMP_MIN_TCE_ENTRIES	2048

#endif /* CONFIG_CRASH_DUMP */

#ifndef __ASSEMBLY__

#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
extern void reserve_kdump_trampoline(void);
extern void setup_kdump_trampoline(void);
#else
/* !CRASH_DUMP || !NONSTATIC_KERNEL */


static inline void reserve_kdump_trampoline(void) { ; }
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static inline void setup_kdump_trampoline(void) { ; }
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#endif

#endif /* __ASSEMBLY__ */

#endif /* __PPC64_KDUMP_H */
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Directory: arch/powerpc/include/asm

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