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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
//============================================================
//
// sdlos_*.c - OS specific low level code
//
// Copyright (c) 1996-2010, Nicola Salmoria and the MAME Team.
// Visit http://mamedev.org for licensing and usage restrictions.
//
// SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================
// standard sdl header
#include <SDL/SDL.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#define INCL_DOS
#include <os2.h>
// MAME headers
#include "osdepend.h"
#include "osdcore.h"
//============================================================
// PROTOTYPES
//============================================================
static osd_ticks_t init_cycle_counter(void);
static osd_ticks_t performance_cycle_counter(void);
//============================================================
// STATIC VARIABLES
//============================================================
// global cycle_counter function and divider
static osd_ticks_t (*cycle_counter)(void) = init_cycle_counter;
static osd_ticks_t (*ticks_counter)(void) = init_cycle_counter;
static osd_ticks_t ticks_per_second;
//============================================================
// init_cycle_counter
//
// to avoid total grossness, this function is split by subarch
//============================================================
static osd_ticks_t init_cycle_counter(void)
{
osd_ticks_t start, end;
osd_ticks_t a, b;
ULONG frequency;
PTIB ptib;
ULONG ulClass;
ULONG ulDelta;
DosGetInfoBlocks( &ptib, NULL );
ulClass = HIBYTE( ptib->tib_ptib2->tib2_ulpri );
ulDelta = LOBYTE( ptib->tib_ptib2->tib2_ulpri );
if ( DosTmrQueryFreq( &frequency ) == 0 )
{
// use performance counter if available as it is constant
cycle_counter = performance_cycle_counter;
ticks_counter = performance_cycle_counter;
ticks_per_second = frequency;
// return the current cycle count
return (*cycle_counter)();
}
else
{
fprintf(stderr, "No Timer available!\n");
exit(-1);
}
// temporarily set our priority higher
DosSetPriority( PRTYS_THREAD, PRTYC_TIMECRITICAL, PRTYD_MAXIMUM, 0 );
// wait for an edge on the timeGetTime call
a = SDL_GetTicks();
do
{
b = SDL_GetTicks();
} while (a == b);
// get the starting cycle count
start = (*cycle_counter)();
// now wait for 1/4 second total
do
{
a = SDL_GetTicks();
} while (a - b < 250);
// get the ending cycle count
end = (*cycle_counter)();
// compute ticks_per_sec
ticks_per_second = (end - start) * 4;
// restore our priority
DosSetPriority( PRTYS_THREAD, ulClass, ulDelta, 0 );
// return the current cycle count
return (*cycle_counter)();
}
//============================================================
// performance_cycle_counter
//============================================================
static osd_ticks_t performance_cycle_counter(void)
{
QWORD qwTime;
DosTmrQueryTime( &qwTime );
return (osd_ticks_t)qwTime.ulLo;
}
//============================================================
// osd_cycles
//============================================================
osd_ticks_t osd_ticks(void)
{
return (*cycle_counter)();
}
//============================================================
// osd_ticks_per_second
//============================================================
osd_ticks_t osd_ticks_per_second(void)
{
if (ticks_per_second == 0)
{
return 1; // this isn't correct, but it prevents the crash
}
return ticks_per_second;
}
//============================================================
// osd_sleep
//============================================================
void osd_sleep(osd_ticks_t duration)
{
UINT32 msec;
// make sure we've computed ticks_per_second
if (ticks_per_second == 0)
(void)osd_ticks();
// convert to milliseconds, rounding down
msec = (UINT32)(duration * 1000 / ticks_per_second);
// only sleep if at least 2 full milliseconds
if (msec >= 2)
{
// take a couple of msecs off the top for good measure
msec -= 2;
usleep(msec*1000);
}
}
//============================================================
// osd_num_processors
//============================================================
int osd_num_processors(void)
{
ULONG numprocs = 1;
DosQuerySysInfo(QSV_NUMPROCESSORS, QSV_NUMPROCESSORS, &numprocs, sizeof(numprocs));
return numprocs;
}
//============================================================
// osd_alloc_executable
//
// allocates "size" bytes of executable memory. this must take
// things like NX support into account.
//============================================================
void *osd_alloc_executable(size_t size)
{
void *p;
DosAllocMem( &p, size, fALLOC );
return p;
}
//============================================================
// osd_free_executable
//
// frees memory allocated with osd_alloc_executable
//============================================================
void osd_free_executable(void *ptr, size_t size)
{
DosFreeMem( ptr );
}
//============================================================
// osd_break_into_debugger
//============================================================
void osd_break_into_debugger(const char *message)
{
printf("Ignoring MAME exception: %s\n", message);
}
|