2 * Definitions for talking to the Open Firmware PROM on
3 * Power Macintosh computers.
5 * Copyright (C) 1996 Paul Mackerras.
11 /* This is used in arch/ppc/mm/mem_pieces.h */
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.
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);
29 #define PTRRELOC(x) ((typeof(x))add_reloc_offset((unsigned long)(x)))
30 #define PTRUNRELOC(x) ((typeof(x))sub_reloc_offset((unsigned long)(x)))
33 * Fallback definitions since we don't support OF in arch/ppc any more.
35 #define machine_is_compatible(x) 0
36 #define of_find_compatible_node(f, t, c) NULL
37 #define of_get_property(p, n, l) NULL
38 #define get_property(a, b, c) of_get_property((a), (b), (c))
40 #endif /* _PPC_PROM_H */
41 #endif /* __KERNEL__ */