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Author Date Id Revision
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File size:
952 bytes
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| 1 | /*
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| 2 | * Segment:offset types and macros
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| 3 | *
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| 4 | * Initially written by Michael Brown (mcb30).
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| 5 | */
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| 6 |
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| 7 | #ifndef SEGOFF_H
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| 8 | #define SEGOFF_H
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| 9 |
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| 10 | #include <stdint.h>
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| 11 | #include <osdep.h>
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| 12 | #include <io.h>
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| 13 |
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| 14 | /* Segment:offset structure. Note that the order within the structure
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| 15 | * is offset:segment.
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| 16 | */
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| 17 | typedef struct {
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| 18 | uint16_t offset;
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| 19 | uint16_t segment;
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| 20 | } segoff_t;
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| 21 |
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| 22 | /* Macros for converting from virtual to segment:offset addresses,
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| 23 | * when we don't actually care which of the many isomorphic results we
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| 24 | * get.
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| 25 | */
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| 26 | #ifdef DEBUG_SEGMENT
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| 27 | uint16_t SEGMENT ( const void * const ptr ) {
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| 28 | uint32_t phys = virt_to_phys ( ptr );
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| 29 | if ( phys > 0xfffff ) {
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| 30 | printf ( "FATAL ERROR: segment address out of range\n" );
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| 31 | }
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| 32 | return phys >> 4;
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| 33 | }
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| 34 | #else
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| 35 | #define SEGMENT(x) ( virt_to_phys ( x ) >> 4 )
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| 36 | #endif
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| 37 | #define OFFSET(x) ( virt_to_phys ( x ) & 0xf )
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| 38 | #define SEGOFF(x) { OFFSET(x), SEGMENT(x) }
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| 39 | #define VIRTUAL(x,y) ( phys_to_virt ( ( ( x ) << 4 ) + ( y ) ) )
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| 40 |
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| 41 | #endif /* SEGOFF_H */
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