1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PPC64_KDUMP_H
3 #define _PPC64_KDUMP_H
4
5 #include <asm/page.h>
6
7 #define KDUMP_KERNELBASE 0x2000000
8
9 /* How many bytes to reserve at zero for kdump. The reserve limit should
10 * be greater or equal to the trampoline's end address.
11 * Reserve to the end of the FWNMI area, see head_64.S */
12 #define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
13
14 #ifdef CONFIG_CRASH_DUMP
15
16 /*
17 * On PPC64 translation is disabled during trampoline setup, so we use
18 * physical addresses. Though on PPC32 translation is already enabled,
19 * so we can't do the same. Luckily create_trampoline() creates relative
20 * branches, so we can just add the PAGE_OFFSET and don't worry about it.
21 */
22 #ifdef __powerpc64__
23 #define KDUMP_TRAMPOLINE_START 0x0100
24 #define KDUMP_TRAMPOLINE_END 0x3000
25 #else
26 #define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
27 #define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
28 #endif /* __powerpc64__ */
29
30 #define KDUMP_MIN_TCE_ENTRIES 2048
31
32 #endif /* CONFIG_CRASH_DUMP */
33
34 #ifndef __ASSEMBLY__
35
36 #if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
37 extern void reserve_kdump_trampoline(void);
38 extern void setup_kdump_trampoline(void);
39 #else
40 /* !CRASH_DUMP || !NONSTATIC_KERNEL */
41 static inline void reserve_kdump_trampoline(void) { ; }
42 static inline void setup_kdump_trampoline(void) { ; }
43 #endif
44
45 #endif /* __ASSEMBLY__ */
46
47 #endif /* __PPC64_KDUMP_H */
48
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