w32tex
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  Fossies Dox: w32tex-src.tar.xz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

pixman-ppc.c
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1 /*
2  * Copyright © 2000 SuSE, Inc.
3  * Copyright © 2007 Red Hat, Inc.
4  *
5  * Permission to use, copy, modify, distribute, and sell this software and its
6  * documentation for any purpose is hereby granted without fee, provided that
7  * the above copyright notice appear in all copies and that both that
8  * copyright notice and this permission notice appear in supporting
9  * documentation, and that the name of SuSE not be used in advertising or
10  * publicity pertaining to distribution of the software without specific,
11  * written prior permission. SuSE makes no representations about the
12  * suitability of this software for any purpose. It is provided "as is"
13  * without express or implied warranty.
14  *
15  * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
17  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
19  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21  */
22 #ifdef HAVE_CONFIG_H
23 #include <config.h>
24 #endif
25 
26 #include "pixman-private.h"
27 
28 #ifdef USE_VMX
29 
30 /* The CPU detection code needs to be in a file not compiled with
31  * "-maltivec -mabi=altivec", as gcc would try to save vector register
32  * across function calls causing SIGILL on cpus without Altivec/vmx.
33  */
34 #ifdef __APPLE__
35 #include <sys/sysctl.h>
36 
37 static pixman_bool_t
38 pixman_have_vmx (void)
39 {
40  int error, have_vmx;
41  size_t length = sizeof(have_vmx);
42 
43  error = sysctlbyname ("hw.optional.altivec", &have_vmx, &length, NULL, 0);
44 
45  if (error)
46  return FALSE;
47 
48  return have_vmx;
49 }
50 
51 #elif defined (__OpenBSD__)
52 #include <sys/param.h>
53 #include <sys/sysctl.h>
54 #include <machine/cpu.h>
55 
56 static pixman_bool_t
57 pixman_have_vmx (void)
58 {
59  int error, have_vmx;
60  int mib[2] = { CTL_MACHDEP, CPU_ALTIVEC };
61  size_t length = sizeof(have_vmx);
62 
63  error = sysctl (mib, 2, &have_vmx, &length, NULL, 0);
64 
65  if (error != 0)
66  return FALSE;
67 
68  return have_vmx;
69 }
70 
71 #elif defined (__linux__)
72 
73 #include <sys/types.h>
74 #include <sys/stat.h>
75 #include <fcntl.h>
76 #include <unistd.h>
77 #include <stdio.h>
78 #include <linux/auxvec.h>
79 #include <asm/cputable.h>
80 
81 static pixman_bool_t
82 pixman_have_vmx (void)
83 {
84  int have_vmx = FALSE;
85  int fd;
86  struct
87  {
88  unsigned long type;
89  unsigned long value;
90  } aux;
91 
92  fd = open ("/proc/self/auxv", O_RDONLY);
93  if (fd >= 0)
94  {
95  while (read (fd, &aux, sizeof (aux)) == sizeof (aux))
96  {
97  if (aux.type == AT_HWCAP && (aux.value & PPC_FEATURE_HAS_ALTIVEC))
98  {
99  have_vmx = TRUE;
100  break;
101  }
102  }
103 
104  close (fd);
105  }
106 
107  return have_vmx;
108 }
109 
110 #else /* !__APPLE__ && !__OpenBSD__ && !__linux__ */
111 #include <signal.h>
112 #include <setjmp.h>
113 
114 static jmp_buf jump_env;
115 
116 static void
117 vmx_test (int sig,
118  siginfo_t *si,
119  void * unused)
120 {
121  longjmp (jump_env, 1);
122 }
123 
124 static pixman_bool_t
125 pixman_have_vmx (void)
126 {
127  struct sigaction sa, osa;
128  int jmp_result;
129 
130  sa.sa_flags = SA_SIGINFO;
131  sigemptyset (&sa.sa_mask);
132  sa.sa_sigaction = vmx_test;
133  sigaction (SIGILL, &sa, &osa);
134  jmp_result = setjmp (jump_env);
135  if (jmp_result == 0)
136  {
137  asm volatile ( "vor 0, 0, 0" );
138  }
139  sigaction (SIGILL, &osa, NULL);
140  return (jmp_result == 0);
141 }
142 
143 #endif /* __APPLE__ */
144 #endif /* USE_VMX */
145 
148 {
149 #ifdef USE_VMX
150  if (!_pixman_disabled ("vmx") && pixman_have_vmx ())
152 #endif
153 
154  return imp;
155 }
#define type(a)
Definition: aptex-macros.h:171
@ FALSE
Definition: dd.h:101
@ TRUE
Definition: dd.h:102
#define error(a)
Definition: dviinfo.c:48
#define NULL
Definition: ftobjs.h:61
#define read
Definition: win32lib.h:88
#define O_RDONLY
Definition: win32lib.h:176
#define open
Definition: win32lib.h:86
#define close
Definition: win32lib.h:63
#define length(c)
Definition: ctangleboot.c:65
#define unused
Definition: main.c:29
@ aux
Definition: lyrics.c:59
union value value
Definition: obx.h:44
pixman_bool_t _pixman_disabled(const char *name)
pixman_implementation_t * _pixman_ppc_get_implementations(pixman_implementation_t *imp)
Definition: pixman-ppc.c:147
pixman_implementation_t * _pixman_implementation_create_vmx(pixman_implementation_t *fallback)
Definition: pixman-vmx.c:3116
int pixman_bool_t
Definition: pixman.h:113