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
|
/*
* cpu_accel.c
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <inttypes.h>
#include "mpeg2.h"
#ifdef ACCEL_DETECT
#ifdef ARCH_X86
static inline uint32_t arch_accel (void)
{
uint32_t eax, ebx, ecx, edx;
int AMD;
uint32_t caps;
#ifndef PIC
#define cpuid(op,eax,ebx,ecx,edx) \
__asm__ ("cpuid" \
: "=a" (eax), \
"=b" (ebx), \
"=c" (ecx), \
"=d" (edx) \
: "a" (op) \
: "cc")
#else /* PIC version : save ebx */
#define cpuid(op,eax,ebx,ecx,edx) \
__asm__ ("push %%ebx\n\t" \
"cpuid\n\t" \
"movl %%ebx,%1\n\t" \
"pop %%ebx" \
: "=a" (eax), \
"=r" (ebx), \
"=c" (ecx), \
"=d" (edx) \
: "a" (op) \
: "cc")
#endif
__asm__ ("pushf\n\t"
"pushf\n\t"
"pop %0\n\t"
"movl %0,%1\n\t"
"xorl $0x200000,%0\n\t"
"push %0\n\t"
"popf\n\t"
"pushf\n\t"
"pop %0\n\t"
"popf"
: "=r" (eax),
"=r" (ebx)
:
: "cc");
if (eax == ebx) /* no cpuid */
return 0;
cpuid (0x00000000, eax, ebx, ecx, edx);
if (!eax) /* vendor string only */
return 0;
AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
cpuid (0x00000001, eax, ebx, ecx, edx);
if (! (edx & 0x00800000)) /* no MMX */
return 0;
caps = MPEG2_ACCEL_X86_MMX;
if (edx & 0x02000000) /* SSE - identical to AMD MMX extensions */
caps = MPEG2_ACCEL_X86_MMX | MPEG2_ACCEL_X86_MMXEXT;
cpuid (0x80000000, eax, ebx, ecx, edx);
if (eax < 0x80000001) /* no extended capabilities */
return caps;
cpuid (0x80000001, eax, ebx, ecx, edx);
if (edx & 0x80000000)
caps |= MPEG2_ACCEL_X86_3DNOW;
if (AMD && (edx & 0x00400000)) /* AMD MMX extensions */
caps |= MPEG2_ACCEL_X86_MMXEXT;
return caps;
}
#endif /* ARCH_X86 */
#ifdef ARCH_PPC
#include <signal.h>
#include <setjmp.h>
static sigjmp_buf jmpbuf;
static volatile sig_atomic_t canjump = 0;
static RETSIGTYPE sigill_handler (int sig)
{
if (!canjump) {
signal (sig, SIG_DFL);
raise (sig);
}
canjump = 0;
siglongjmp (jmpbuf, 1);
}
static inline uint32_t arch_accel (void)
{
static RETSIGTYPE (* oldsig) (int);
oldsig = signal (SIGILL, sigill_handler);
if (sigsetjmp (jmpbuf, 1)) {
signal (SIGILL, oldsig);
return 0;
}
canjump = 1;
#ifdef HAVE_ALTIVEC_H /* gnu */
#define VAND(a,b,c) "vand " #a "," #b "," #c "\n\t"
#else /* apple */
#define VAND(a,b,c) "vand v" #a ",v" #b ",v" #c "\n\t"
#endif
asm volatile ("mtspr 256, %0\n\t"
VAND (0, 0, 0)
:
: "r" (-1));
signal (SIGILL, oldsig);
return MPEG2_ACCEL_PPC_ALTIVEC;
}
#endif /* ARCH_PPC */
#ifdef ARCH_ALPHA
static inline uint32_t arch_accel (void)
{
#ifdef CAN_COMPILE_ALPHA_MVI
uint64_t no_mvi;
asm volatile ("amask %1, %0"
: "=r" (no_mvi)
: "rI" (256)); /* AMASK_MVI */
return no_mvi ? MPEG2_ACCEL_ALPHA : (MPEG2_ACCEL_ALPHA |
MPEG2_ACCEL_ALPHA_MVI);
#else
return MPEG2_ACCEL_ALPHA;
#endif
}
#endif /* ARCH_ALPHA */
#endif
uint32_t mpeg2_detect_accel (void)
{
uint32_t accel;
accel = 0;
#ifdef ACCEL_DETECT
#ifdef LIBMPEG2_MLIB
accel = MPEG2_ACCEL_MLIB;
#endif
#if defined (ARCH_X86) || defined (ARCH_PPC) || defined (ARCH_ALPHA)
accel |= arch_accel ();
#endif
#endif
return accel;
}
|
