| 1 | /*
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| 2 | ** Copyright 2002, Michael Noisternig. All rights reserved.
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| 3 | ** Distributed under the terms of the NewOS License.
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| 4 | */
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| 5 | #ifndef _I386_SELECTOR_H_
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| 6 | #define _I386_SELECTOR_H_
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| 7 |
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| 8 | #include <arch/i386/types.h>
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| 9 |
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| 10 | typedef uint32 selector_id;
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| 11 | typedef uint64 selector_type;
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| 12 |
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| 13 | // DATA segments are read-only
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| 14 | // CODE segments are execute-only
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| 15 | // both can be modified by using the suffixed enum versions
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| 16 | // legend: w = writable
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| 17 | // d = expand down
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| 18 | // r = readable
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| 19 | // c = conforming
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| 20 | enum segment_type {
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| 21 | DATA = 0x8, DATA_w, DATA_d, DATA_wd, CODE, CODE_r, CODE_c, CODE_rc
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| 22 | };
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| 23 |
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| 24 | #define SELECTOR(base,limit,type,mode32) \
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| 25 | (((uint64)(((((uint32)base)>>16)&0xff) | (((uint32)base)&0xff000000) | ((type)<<9) | ((mode32)<<22) | (1<<15))<<32) \
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| 26 | | ( (limit) >= (1<<20) ? (((limit)>>12)&0xffff) | ((uint64)(((limit)>>12)&0xf0000)<<32) | ((uint64)1<<(23+32)) : ((limit)&0xffff) | ((uint64)((limit)&0xf0000)<<32) ) \
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| 27 | | ((((uint32)base)&0xffff)<<16))
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| 28 |
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| 29 | void i386_selector_init( void *gdt );
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| 30 | selector_id i386_selector_add( selector_type selector );
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| 31 | void i386_selector_remove( selector_id id );
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| 32 | selector_type i386_selector_get( selector_id id );
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| 33 |
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| 34 | #endif
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| 35 |
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