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/*
* Copyright © 2000 SuSE, Inc.
* Copyright © 2007 Red Hat, Inc.
* Copyright © 2021 Moonchild Productions
*
* 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 names of the authors not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The authors make no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE AUTHORS
* 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 (__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;
}
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