arch/powerpc/include/asm/kdump.h

   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 */