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Last change
on this file since 1372 was 1, checked in by vboxsync, 55 years ago |
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import
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Author Date Id Revision
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File size:
643 bytes
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| 1 | /* Segment indexes. Must match the gdt definition in segment.c. */
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| 2 | enum {
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| 3 | NULL_SEG,
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| 4 | FLAT_CODE,
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| 5 | FLAT_DATA,
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| 6 | RELOC_CODE,
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| 7 | RELOC_DATA,
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| 8 | NUM_SEG,
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| 9 | };
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| 10 |
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| 11 | /* Values for segment selector register */
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| 12 | #define FLAT_CS (FLAT_CODE << 3)
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| 13 | #define FLAT_DS (FLAT_DATA << 3)
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| 14 | #define RELOC_CS (RELOC_CODE << 3)
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| 15 | #define RELOC_DS (RELOC_DATA << 3)
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| 16 |
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| 17 | /* i386 segment descriptor */
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| 18 | struct segment_desc {
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| 19 | unsigned short limit_0;
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| 20 | unsigned short base_0;
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| 21 | unsigned char base_16;
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| 22 | unsigned char types;
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| 23 | unsigned char flags;
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| 24 | unsigned char base_24;
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| 25 | };
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| 26 |
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| 27 | extern struct segment_desc gdt[NUM_SEG];
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| 28 |
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| 29 | #define GDT_LIMIT ((NUM_SEG << 3) - 1)
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