41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/*
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* Definitions for talking to the Open Firmware PROM on
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* Power Macintosh computers.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*/
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#ifdef __KERNEL__
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#ifndef _PPC_PROM_H
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#define _PPC_PROM_H
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/* This is used in arch/ppc/mm/mem_pieces.h */
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struct reg_property {
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unsigned int address;
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unsigned int size;
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};
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/*
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* These macros assist in performing the address calculations that we
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* need to do to access data when the kernel is running at an address
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* that is different from the address that the kernel is linked at.
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* The reloc_offset() function returns the difference between these
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* two addresses and the macros simplify the process of adding or
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* subtracting this offset to/from pointer values.
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*/
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extern unsigned long reloc_offset(void);
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extern unsigned long add_reloc_offset(unsigned long);
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extern unsigned long sub_reloc_offset(unsigned long);
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#define PTRRELOC(x) ((typeof(x))add_reloc_offset((unsigned long)(x)))
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#define PTRUNRELOC(x) ((typeof(x))sub_reloc_offset((unsigned long)(x)))
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/*
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* Fallback definitions since we don't support OF in arch/ppc any more.
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*/
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#define machine_is_compatible(x) 0
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#define of_find_compatible_node(f, t, c) NULL
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#define of_get_property(p, n, l) NULL
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#endif /* _PPC_PROM_H */
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#endif /* __KERNEL__ */
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