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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* $Id: segment.h,v 1.14 2009-01-28 16:47:15 potyra Exp $
*
* Copyright (C) 2004-2009 FAUmachine Team <info@faumachine.org>.
* This program is free software. You can redistribute it and/or modify it
* under the terms of the GNU General Public License, either version 2 of
* the License, or (at your option) any later version. See COPYING.
*/
#ifndef __SEGMENT_H_INCLUDED
#define __SEGMENT_H_INCLUDED
#include "compiler.h"
static inline __attribute__((__always_inline__)) uint16_t
get_cs(void)
{
uint16_t cs;
__asm__(
"movw %%cs,%0\n"
: "=a" (cs)
);
return cs;
}
static inline __attribute__((__always_inline__)) void
__put_byte(uint16_t seg, uint16_t offset, uint8_t val)
{
asm volatile (
"movw %0, %%es\n"
"movb %2, %%es:(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "a" (val)
: "memory"
);
}
static inline __attribute__((__always_inline__)) void
__put_word(uint16_t seg, uint16_t offset, uint16_t val)
{
asm volatile (
"movw %0, %%es\n"
"movw %2, %%es:(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "a" (val)
: "memory"
);
}
static inline __attribute__((__always_inline__)) void
__put_long(uint16_t seg, uint16_t offset, uint32_t val)
{
asm volatile (
"movw %0, %%es\n"
"movl %2, %%es:(%1)\n"
: /* no output */
: "r" (seg), "b" (offset), "r" (val)
: "memory"
);
}
static inline __attribute__((__always_inline__)) uint8_t
__get_byte(uint16_t seg, uint16_t offset)
{
uint8_t val;
asm volatile (
"movw %1, %%es\n"
"movb %%es:(%2), %0\n"
: "=a" (val)
: "r" (seg), "b" (offset)
);
return val;
}
static inline __attribute__((__always_inline__)) uint16_t
__get_word(uint16_t seg, uint16_t offset)
{
uint16_t val;
asm volatile (
"movw %1, %%es\n"
"movw %%es:(%2), %0\n"
: "=a" (val)
: "r" (seg), "b" (offset)
);
return val;
}
static inline __attribute__((__always_inline__)) uint32_t
__get_long(uint16_t seg, uint16_t offset)
{
uint32_t val;
asm volatile (
"movw %1, %%es\n"
"movl %%es:(%2), %0\n"
: "=r" (val)
: "r" (seg), "b" (offset)
);
return val;
}
#define put_byte(seg, off, val) \
__put_byte((seg), (uint16_t) (unsigned long) (off), (val))
#define put_word(seg, off, val) \
__put_word((seg), (uint16_t) (unsigned long) (off), (val))
#define put_long(seg, off, val) \
__put_long((seg), (uint16_t) (unsigned long) (off), (val))
#define get_byte(seg, off) \
__get_byte((seg), (uint16_t) (unsigned long) (off))
#define get_word(seg, off) \
__get_word((seg), (uint16_t) (unsigned long) (off))
#define get_long(seg, off) \
__get_long((seg), (uint16_t) (unsigned long) (off))
#endif /* __SEGMENT_H_INCLUDED */
|
