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comparison: gfx/cairo/libpixman/src/pixman-ppc.c
gfx/cairo/libpixman/src/pixman-ppc.c
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| -1:000000000000 | 0:1d612cd9eb37 |
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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 | |
| 146 pixman_implementation_t * | |
| 147 _pixman_ppc_get_implementations (pixman_implementation_t *imp) | |
| 148 { | |
| 149 #ifdef USE_VMX | |
| 150 if (!_pixman_disabled ("vmx") && pixman_have_vmx ()) | |
| 151 imp = _pixman_implementation_create_vmx (imp); | |
| 152 #endif | |
| 153 | |
| 154 return imp; | |
| 155 } |
