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