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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* Mesa 3-D graphics library
* Version: 4.0
*
* Copyright (C) 1999 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* DOS/DJGPP device driver v1.4 for Mesa
*
* Copyright (C) 2002 - Borca Daniel
* Email : dborca@yahoo.com
* Web : http://www.geocities.com/dborca
*/
#include <dpmi.h>
#include "internal.h"
#ifndef MAX
#define MAX(x, y) (((x)<(y))?(y):(x))
#endif
/* _create_linear_mapping:
* Maps a physical address range into linear memory.
*/
int _create_linear_mapping (unsigned long *linear, unsigned long physaddr, int size)
{
__dpmi_meminfo meminfo;
if (physaddr >= 0x100000) {
/* map into linear memory */
meminfo.address = physaddr;
meminfo.size = size;
if (__dpmi_physical_address_mapping(&meminfo) != 0)
return -1;
*linear = meminfo.address;
} else {
/* exploit 1 -> 1 physical to linear mapping in low megabyte */
*linear = physaddr;
}
return 0;
}
/* _remove_linear_mapping:
* Frees the DPMI resources being used to map a linear address range.
*/
void _remove_linear_mapping (unsigned long *linear)
{
__dpmi_meminfo meminfo;
if (*linear) {
if (*linear >= 0x100000) {
meminfo.address = *linear;
__dpmi_free_physical_address_mapping(&meminfo);
}
*linear = 0;
}
}
/* _create_selector:
* Allocates a selector to access a region of linear memory.
*/
int _create_selector (int *segment, unsigned long base, int size)
{
/* allocate an ldt descriptor */
if ((*segment=__dpmi_allocate_ldt_descriptors(1)) < 0) {
*segment = 0;
return -1;
}
/* create the linear mapping */
if (_create_linear_mapping(&base, base, size)) {
__dpmi_free_ldt_descriptor(*segment);
*segment = 0;
return -1;
}
/* set the descriptor base and limit */
__dpmi_set_segment_base_address(*segment, base);
__dpmi_set_segment_limit(*segment, MAX(size-1, 0xFFFF));
return 0;
}
/* _remove_selector:
* Frees a DPMI segment selector.
*/
void _remove_selector (int *segment)
{
if (*segment) {
unsigned long base;
__dpmi_get_segment_base_address(*segment, &base);
_remove_linear_mapping(&base);
__dpmi_free_ldt_descriptor(*segment);
*segment = 0;
}
}
/* Desc: retrieve CPU MMX capability
*
* In : -
* Out : FALSE if CPU cannot do MMX
*
* Note: -
*/
int _can_mmx (void)
{
#ifdef USE_MMX_ASM
extern int _mesa_x86_cpu_features;
return (_mesa_x86_cpu_features & 0x00800000);
#else
return 0;
#endif
}
|
