42 lines
952 B
C
42 lines
952 B
C
/*
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* Segment:offset types and macros
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*
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* Initially written by Michael Brown (mcb30).
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*/
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#ifndef SEGOFF_H
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#define SEGOFF_H
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#include <stdint.h>
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#include <osdep.h>
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#include <io.h>
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/* Segment:offset structure. Note that the order within the structure
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* is offset:segment.
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*/
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typedef struct {
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uint16_t offset;
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uint16_t segment;
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} segoff_t;
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/* Macros for converting from virtual to segment:offset addresses,
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* when we don't actually care which of the many isomorphic results we
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* get.
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*/
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#ifdef DEBUG_SEGMENT
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uint16_t SEGMENT ( const void * const ptr ) {
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uint32_t phys = virt_to_phys ( ptr );
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if ( phys > 0xfffff ) {
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printf ( "FATAL ERROR: segment address out of range\n" );
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}
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return phys >> 4;
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}
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#else
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#define SEGMENT(x) ( virt_to_phys ( x ) >> 4 )
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#endif
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#define OFFSET(x) ( virt_to_phys ( x ) & 0xf )
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#define SEGOFF(x) { OFFSET(x), SEGMENT(x) }
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#define VIRTUAL(x,y) ( phys_to_virt ( ( ( x ) << 4 ) + ( y ) ) )
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#endif /* SEGOFF_H */
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