1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2003 Kevin P. Lawton
*
* descriptor2.h: defines for descriptors and selectors
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __DESCRIPTOR2_H__
#define __DESCRIPTOR2_H__
typedef struct
{
Bit16u offset_low;
selector_t selector;
unsigned count:5;
unsigned RESERVED:3;
unsigned type:5;
unsigned dpl:2;
unsigned p:1;
Bit16u offset_high;
} __attribute__ ((packed)) gate_t;
#define SET_INT_GATE(d, S,O,P,DPL, D) {\
d.selector = (S);\
d.offset_high = (O) >> 16;\
d.offset_low = (O) & 0xffff;\
d.RESERVED = 0;\
d.type = ((D)<<3) | 0x6;\
d.dpl = (DPL);\
d.p = (P);\
}
#define SET_TRAP_GATE(d, S,O,P,DPL, D) {\
d.selector = (S);\
d.offset_high = (O) >> 16;\
d.offset_low = (O) & 0xffff;\
d.RESERVED = 0;\
d.type = ((D)<<3) | 0x7;\
d.dpl = (DPL);\
d.p = (P);\
}
typedef struct
{
Bit32u offset;
Bit16u selector;
} __attribute ((packed)) far_jmp_info_t;
#endif /* __DESCRIPTOR2_H__ */
|
