mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-23 04:41:11 +00:00
8a0a0f7524
MOZ_RUNINIT => initialized at runtime MOZ_CONSTINIT => initialized at compile time MOZ_GLOBINIT => initialized either at runtime or compile time, depending on template parameter, macro parameter etc This annotation is only understood by our clang-tidy plugin. It has no effect on regular compilation. Differential Revision: https://phabricator.services.mozilla.com/D223341
147 lines
4.6 KiB
C++
147 lines
4.6 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* compile-time and runtime tests for whether to use various ARM extensions */
|
|
|
|
#include "arm.h"
|
|
#include "mozilla/Attributes.h"
|
|
|
|
#if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
|
|
|
|
// arm.h has parallel #ifs which declare MOZILLA_ARM_HAVE_CPUID_DETECTION.
|
|
// We don't check it here so that we get compile errors if it's defined, but
|
|
// we don't compile one of these detection methods. The detection code here is
|
|
// based on the CPU detection in libtheora.
|
|
|
|
# if defined(__linux__) || defined(ANDROID)
|
|
# include <stdio.h>
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
|
|
enum {
|
|
MOZILLA_HAS_EDSP_FLAG = 1,
|
|
MOZILLA_HAS_ARMV6_FLAG = 2,
|
|
MOZILLA_HAS_ARMV7_FLAG = 4,
|
|
MOZILLA_HAS_NEON_FLAG = 8,
|
|
MOZILLA_HAS_AES_FLAG = 16
|
|
};
|
|
|
|
static unsigned get_arm_cpu_flags(void) {
|
|
unsigned flags;
|
|
FILE* fin;
|
|
bool armv6_processor = false;
|
|
flags = 0;
|
|
/*Reading /proc/self/auxv would be easier, but that doesn't work reliably on
|
|
Android. This also means that detection will fail in Scratchbox, which is
|
|
desirable, as NEON does not work in the qemu shipped with the Maemo 5 SDK.
|
|
I don't know if /proc/self/auxv would do any better in that case, anyway,
|
|
or if it would return random flags from the host CPU.*/
|
|
fin = fopen("/proc/cpuinfo", "r");
|
|
if (fin != nullptr) {
|
|
/*512 should be enough for anybody (it's even enough for all the flags that
|
|
x86 has accumulated... so far).*/
|
|
char buf[512];
|
|
while (fgets(buf, 511, fin) != nullptr) {
|
|
if (memcmp(buf, "Features", 8) == 0) {
|
|
char* p;
|
|
p = strstr(buf, " edsp");
|
|
if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
|
|
flags |= MOZILLA_HAS_EDSP_FLAG;
|
|
p = strstr(buf, " neon");
|
|
if (p != nullptr && (p[5] == ' ' || p[5] == '\n'))
|
|
flags |= MOZILLA_HAS_NEON_FLAG;
|
|
p = strstr(buf, " aes");
|
|
if (p != nullptr && (p[4] == ' ' || p[4] == '\n')) {
|
|
flags |= MOZILLA_HAS_AES_FLAG;
|
|
}
|
|
}
|
|
if (memcmp(buf, "CPU architecture:", 17) == 0) {
|
|
int version;
|
|
version = atoi(buf + 17);
|
|
if (version >= 6) flags |= MOZILLA_HAS_ARMV6_FLAG;
|
|
if (version >= 7) flags |= MOZILLA_HAS_ARMV7_FLAG;
|
|
}
|
|
/* media/webrtc/trunk/src/system_wrappers/source/cpu_features_arm.c
|
|
* Unfortunately, it seems that certain ARMv6-based CPUs
|
|
* report an incorrect architecture number of 7!
|
|
*
|
|
* We try to correct this by looking at the 'elf_format'
|
|
* field reported by the 'Processor' field, which is of the
|
|
* form of "(v7l)" for an ARMv7-based CPU, and "(v6l)" for
|
|
* an ARMv6-one.
|
|
*/
|
|
if (memcmp(buf, "Processor\t:", 11) == 0) {
|
|
if (strstr(buf, "(v6l)") != 0) {
|
|
armv6_processor = true;
|
|
}
|
|
}
|
|
}
|
|
fclose(fin);
|
|
}
|
|
if (armv6_processor) {
|
|
// ARMv6 pretending to be ARMv7? clear flag
|
|
if (flags & MOZILLA_HAS_ARMV7_FLAG) {
|
|
flags &= ~MOZILLA_HAS_ARMV7_FLAG;
|
|
}
|
|
}
|
|
return flags;
|
|
}
|
|
|
|
// Cache a local copy so we only have to read /proc/cpuinfo once.
|
|
MOZ_RUNINIT static unsigned arm_cpu_flags = get_arm_cpu_flags();
|
|
|
|
# if !defined(MOZILLA_PRESUME_EDSP)
|
|
static bool check_edsp(void) {
|
|
return (arm_cpu_flags & MOZILLA_HAS_EDSP_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV6)
|
|
static bool check_armv6(void) {
|
|
return (arm_cpu_flags & MOZILLA_HAS_ARMV6_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARMV7)
|
|
static bool check_armv7(void) {
|
|
return (arm_cpu_flags & MOZILLA_HAS_ARMV7_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_NEON)
|
|
static bool check_neon(void) {
|
|
return (arm_cpu_flags & MOZILLA_HAS_NEON_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# if !defined(MOZILLA_PRESUME_ARM_AES)
|
|
static bool check_aes(void) {
|
|
return (arm_cpu_flags & MOZILLA_HAS_AES_FLAG) != 0;
|
|
}
|
|
# endif
|
|
|
|
# endif // defined(__linux__) || defined(ANDROID)
|
|
|
|
namespace mozilla {
|
|
namespace arm_private {
|
|
# if !defined(MOZILLA_PRESUME_EDSP)
|
|
MOZ_RUNINIT bool edsp_enabled = check_edsp();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_ARMV6)
|
|
MOZ_RUNINIT bool armv6_enabled = check_armv6();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_ARMV7)
|
|
MOZ_RUNINIT bool armv7_enabled = check_armv7();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_NEON)
|
|
MOZ_RUNINIT bool neon_enabled = check_neon();
|
|
# endif
|
|
# if !defined(MOZILLA_PRESUME_ARM_AES)
|
|
MOZ_RUNINIT bool aes_enabled = check_aes();
|
|
# endif
|
|
} // namespace arm_private
|
|
} // namespace mozilla
|
|
|
|
#endif // MOZILLA_ARM_HAVE_CPUID_DETECTION
|