include/asm-ppc/prom.h

   1 /*
   2  * Definitions for talking to the Open Firmware PROM on
   3  * Power Macintosh computers.
   4  *
   5  * Copyright (C) 1996 Paul Mackerras.
   6  */
   7 #ifdef __KERNEL__
   8 #ifndef _PPC_PROM_H
   9 #define _PPC_PROM_H
  10
  11 /* This is used in arch/ppc/mm/mem_pieces.h */
  12 struct reg_property {
  13         unsigned int address;
  14         unsigned int size;
  15 };
  16
  17 /*
  18  * These macros assist in performing the address calculations that we
  19  * need to do to access data when the kernel is running at an address
  20  * that is different from the address that the kernel is linked at.
  21  * The reloc_offset() function returns the difference between these
  22  * two addresses and the macros simplify the process of adding or
  23  * subtracting this offset to/from pointer values.
  24  */
  25 extern unsigned long reloc_offset(void);
  26 extern unsigned long add_reloc_offset(unsigned long);
  27 extern unsigned long sub_reloc_offset(unsigned long);
  28
  29 #define PTRRELOC(x)     ((typeof(x))add_reloc_offset((unsigned long)(x)))
  30 #define PTRUNRELOC(x)   ((typeof(x))sub_reloc_offset((unsigned long)(x)))
  31
  32 /*
  33  * Fallback definitions since we don't support OF in arch/ppc any more.
  34  */
  35 #define machine_is_compatible(x)                0
  36 #define of_find_compatible_node(f, t, c)        NULL
  37 #define get_property(p, n, l)                   NULL
  38
  39 #endif /* _PPC_PROM_H */
  40 #endif /* __KERNEL__ */