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 */
12struct 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 */
25extern unsigned long reloc_offset(void);
26extern unsigned long add_reloc_offset(unsigned long);
27extern 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 of_get_property(p, n, l)		NULL
38#define get_property(a, b, c)			of_get_property((a), (b), (c))
39
40#endif /* _PPC_PROM_H */
41#endif /* __KERNEL__ */
42