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 */
reserve_kdump_trampoline(void)41 static inline void reserve_kdump_trampoline(void) { ; }
setup_kdump_trampoline(void)42 static inline void setup_kdump_trampoline(void) { ; }
43 #endif
44 
45 #endif /* __ASSEMBLY__ */
46 
47 #endif /* __PPC64_KDUMP_H */
48