33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
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/*
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** Copyright 2002, Michael Noisternig. All rights reserved.
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** Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_ARCH_x86_SELECTOR_H
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#define _KERNEL_ARCH_x86_SELECTOR_H
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typedef uint32 selector_id;
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typedef uint64 selector_type;
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// DATA segments are read-only
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// CODE segments are execute-only
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// both can be modified by using the suffixed enum versions
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// legend: w = writable
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// d = expand down
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// r = readable
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// c = conforming
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enum segment_type {
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DATA = 0x8, DATA_w, DATA_d, DATA_wd, CODE, CODE_r, CODE_c, CODE_rc
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};
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#define SELECTOR(base,limit,type,mode32) \
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(((uint64)(((((uint32)base)>>16)&0xff) | (((uint32)base)&0xff000000) | ((type)<<9) | ((mode32)<<22) | (1<<15))<<32) \
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| ( (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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| ((((uint32)base)&0xffff)<<16))
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void i386_selector_init( void *gdt );
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selector_id i386_selector_add( selector_type selector );
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void i386_selector_remove( selector_id id );
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selector_type i386_selector_get( selector_id id );
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#endif
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