arch/powerpc/include/asm/kdump.h

   1 #ifndef _PPC64_KDUMP_H
   2 #define _PPC64_KDUMP_H
   3
   4 #include <asm/page.h>
   5
   6 /*
   7  * If CONFIG_RELOCATABLE is enabled we can place the kdump kernel anywhere.
   8  * To keep enough space in the RMO for the first stage kernel on 64bit, we
   9  * place it at 64MB. If CONFIG_RELOCATABLE is not enabled we must place
  10  * the second stage at 32MB.
  11  */
  12 #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC64)
  13 #define KDUMP_KERNELBASE        0x4000000
  14 #else
  15 #define KDUMP_KERNELBASE        0x2000000
  16 #endif
  17
  18 /* How many bytes to reserve at zero for kdump. The reserve limit should
  19  * be greater or equal to the trampoline's end address.
  20  * Reserve to the end of the FWNMI area, see head_64.S */
  21 #define KDUMP_RESERVE_LIMIT     0x10000 /* 64K */
  22
  23 #ifdef CONFIG_CRASH_DUMP
  24
  25 /*
  26  * On PPC64 translation is disabled during trampoline setup, so we use
  27  * physical addresses. Though on PPC32 translation is already enabled,
  28  * so we can't do the same. Luckily create_trampoline() creates relative
  29  * branches, so we can just add the PAGE_OFFSET and don't worry about it.
  30  */
  31 #ifdef __powerpc64__
  32 #define KDUMP_TRAMPOLINE_START  0x0100
  33 #define KDUMP_TRAMPOLINE_END    0x3000
  34 #else
  35 #define KDUMP_TRAMPOLINE_START  (0x0100 + PAGE_OFFSET)
  36 #define KDUMP_TRAMPOLINE_END    (0x3000 + PAGE_OFFSET)
  37 #endif /* __powerpc64__ */
  38
  39 #define KDUMP_MIN_TCE_ENTRIES   2048
  40
  41 #endif /* CONFIG_CRASH_DUMP */
  42
  43 #ifndef __ASSEMBLY__
  44
  45 #if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_RELOCATABLE)
  46 extern void reserve_kdump_trampoline(void);
  47 extern void setup_kdump_trampoline(void);
  48 #else
  49 /* !CRASH_DUMP || RELOCATABLE */
  50 static inline void reserve_kdump_trampoline(void) { ; }
  51 static inline void setup_kdump_trampoline(void) { ; }
  52 #endif
  53
  54 #endif /* __ASSEMBLY__ */
  55
  56 #endif /* __PPC64_KDUMP_H */