--- /dev/null
+/*
+ * Copyright © 2000 SuSE, Inc.
+ * Copyright © 2007 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of SuSE not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. SuSE makes no representations about the
+ * suitability of this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ *
+ * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
+ * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "pixman-private.h"
+
+typedef enum
+{
+ ARM_V7 = (1 << 0),
+ ARM_V6 = (1 << 1),
+ ARM_VFP = (1 << 2),
+ ARM_NEON = (1 << 3),
+ ARM_IWMMXT = (1 << 4)
+} arm_cpu_features_t;
+
+#if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT)
+
+#if defined(_MSC_VER)
+
+/* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */
+#include <windows.h>
+
+extern int pixman_msvc_try_arm_neon_op ();
+extern int pixman_msvc_try_arm_simd_op ();
+
+static arm_cpu_features_t
+detect_cpu_features (void)
+{
+ arm_cpu_features_t features = 0;
+
+ __try
+ {
+ pixman_msvc_try_arm_simd_op ();
+ features |= ARM_V6;
+ }
+ __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
+ {
+ }
+
+ __try
+ {
+ pixman_msvc_try_arm_neon_op ();
+ features |= ARM_NEON;
+ }
+ __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
+ {
+ }
+
+ return features;
+}
+
+#elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */
+
+#include "TargetConditionals.h"
+
+static arm_cpu_features_t
+detect_cpu_features (void)
+{
+ arm_cpu_features_t features = 0;
+
+ features |= ARM_V6;
+
+ /* Detection of ARM NEON on iOS is fairly simple because iOS binaries
+ * contain separate executable images for each processor architecture.
+ * So all we have to do is detect the armv7 architecture build. The
+ * operating system automatically runs the armv7 binary for armv7 devices
+ * and the armv6 binary for armv6 devices.
+ */
+#if defined(__ARM_NEON__)
+ features |= ARM_NEON;
+#endif
+
+ return features;
+}
+
+#elif defined(__ANDROID__) || defined(ANDROID) /* Android */
+
+#include <cpu-features.h>
+
+static arm_cpu_features_t
+detect_cpu_features (void)
+{
+ arm_cpu_features_t features = 0;
+ AndroidCpuFamily cpu_family;
+ uint64_t cpu_features;
+
+ cpu_family = android_getCpuFamily();
+ cpu_features = android_getCpuFeatures();
+
+ if (cpu_family == ANDROID_CPU_FAMILY_ARM)
+ {
+ if (cpu_features & ANDROID_CPU_ARM_FEATURE_ARMv7)
+ features |= ARM_V7;
+
+ if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFPv3)
+ features |= ARM_VFP;
+
+ if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON)
+ features |= ARM_NEON;
+ }
+
+ return features;
+}
+
+#elif defined (__linux__) /* linux ELF */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <string.h>
+#include <elf.h>
+
+static arm_cpu_features_t
+detect_cpu_features (void)
+{
+ arm_cpu_features_t features = 0;
+ Elf32_auxv_t aux;
+ int fd;
+
+ fd = open ("/proc/self/auxv", O_RDONLY);
+ if (fd >= 0)
+ {
+ while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
+ {
+ if (aux.a_type == AT_HWCAP)
+ {
+ uint32_t hwcap = aux.a_un.a_val;
+
+ /* hardcode these values to avoid depending on specific
+ * versions of the hwcap header, e.g. HWCAP_NEON
+ */
+ if ((hwcap & 64) != 0)
+ features |= ARM_VFP;
+ if ((hwcap & 512) != 0)
+ features |= ARM_IWMMXT;
+ /* this flag is only present on kernel 2.6.29 */
+ if ((hwcap & 4096) != 0)
+ features |= ARM_NEON;
+ }
+ else if (aux.a_type == AT_PLATFORM)
+ {
+ const char *plat = (const char*) aux.a_un.a_val;
+
+ if (strncmp (plat, "v7l", 3) == 0)
+ features |= (ARM_V7 | ARM_V6);
+ else if (strncmp (plat, "v6l", 3) == 0)
+ features |= ARM_V6;
+ }
+ }
+ close (fd);
+ }
+
+ return features;
+}
+
+#else /* Unknown */
+
+static arm_cpu_features_t
+detect_cpu_features (void)
+{
+ return 0;
+}
+
+#endif /* Linux elf */
+
+static pixman_bool_t
+have_feature (arm_cpu_features_t feature)
+{
+ static pixman_bool_t initialized;
+ static arm_cpu_features_t features;
+
+ if (!initialized)
+ {
+ features = detect_cpu_features();
+ initialized = TRUE;
+ }
+
+ return (features & feature) == feature;
+}
+
+#endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */
+
+pixman_implementation_t *
+_pixman_arm_get_implementations (pixman_implementation_t *imp)
+{
+#ifdef USE_ARM_SIMD
+ if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6))
+ imp = _pixman_implementation_create_arm_simd (imp);
+#endif
+
+#ifdef USE_ARM_IWMMXT
+ if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT))
+ imp = _pixman_implementation_create_mmx (imp);
+#endif
+
+#ifdef USE_ARM_NEON
+ if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON))
+ imp = _pixman_implementation_create_arm_neon (imp);
+#endif
+
+ return imp;
+}
Code Review / kvmfornfv.git / blobdiff