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-/*
- * Copyright (C) 2010 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-#ifndef CPU_FEATURES_H
-#define CPU_FEATURES_H
-
-#include <sys/cdefs.h>
-#include <stdint.h>
-
-__BEGIN_DECLS
-
-/* A list of valid values returned by android_getCpuFamily().
- * They describe the CPU Architecture of the current process.
- */
-typedef enum {
- ANDROID_CPU_FAMILY_UNKNOWN = 0,
- ANDROID_CPU_FAMILY_ARM,
- ANDROID_CPU_FAMILY_X86,
- ANDROID_CPU_FAMILY_MIPS,
- ANDROID_CPU_FAMILY_ARM64,
- ANDROID_CPU_FAMILY_X86_64,
- ANDROID_CPU_FAMILY_MIPS64,
-
- ANDROID_CPU_FAMILY_MAX /* do not remove */
-
-} AndroidCpuFamily;
-
-/* Return the CPU family of the current process.
- *
- * Note that this matches the bitness of the current process. I.e. when
- * running a 32-bit binary on a 64-bit capable CPU, this will return the
- * 32-bit CPU family value.
- */
-extern AndroidCpuFamily android_getCpuFamily(void);
-
-/* Return a bitmap describing a set of optional CPU features that are
- * supported by the current device's CPU. The exact bit-flags returned
- * depend on the value returned by android_getCpuFamily(). See the
- * documentation for the ANDROID_CPU_*_FEATURE_* flags below for details.
- */
-extern uint64_t android_getCpuFeatures(void);
-
-/* The list of feature flags for ANDROID_CPU_FAMILY_ARM that can be
- * recognized by the library (see note below for 64-bit ARM). Value details
- * are:
- *
- * VFPv2:
- * CPU supports the VFPv2 instruction set. Many, but not all, ARMv6 CPUs
- * support these instructions. VFPv2 is a subset of VFPv3 so this will
- * be set whenever VFPv3 is set too.
- *
- * ARMv7:
- * CPU supports the ARMv7-A basic instruction set.
- * This feature is mandated by the 'armeabi-v7a' ABI.
- *
- * VFPv3:
- * CPU supports the VFPv3-D16 instruction set, providing hardware FPU
- * support for single and double precision floating point registers.
- * Note that only 16 FPU registers are available by default, unless
- * the D32 bit is set too. This feature is also mandated by the
- * 'armeabi-v7a' ABI.
- *
- * VFP_D32:
- * CPU VFP optional extension that provides 32 FPU registers,
- * instead of 16. Note that ARM mandates this feature is the 'NEON'
- * feature is implemented by the CPU.
- *
- * NEON:
- * CPU FPU supports "ARM Advanced SIMD" instructions, also known as
- * NEON. Note that this mandates the VFP_D32 feature as well, per the
- * ARM Architecture specification.
- *
- * VFP_FP16:
- * Half-width floating precision VFP extension. If set, the CPU
- * supports instructions to perform floating-point operations on
- * 16-bit registers. This is part of the VFPv4 specification, but
- * not mandated by any Android ABI.
- *
- * VFP_FMA:
- * Fused multiply-accumulate VFP instructions extension. Also part of
- * the VFPv4 specification, but not mandated by any Android ABI.
- *
- * NEON_FMA:
- * Fused multiply-accumulate NEON instructions extension. Optional
- * extension from the VFPv4 specification, but not mandated by any
- * Android ABI.
- *
- * IDIV_ARM:
- * Integer division available in ARM mode. Only available
- * on recent CPUs (e.g. Cortex-A15).
- *
- * IDIV_THUMB2:
- * Integer division available in Thumb-2 mode. Only available
- * on recent CPUs (e.g. Cortex-A15).
- *
- * iWMMXt:
- * Optional extension that adds MMX registers and operations to an
- * ARM CPU. This is only available on a few XScale-based CPU designs
- * sold by Marvell. Pretty rare in practice.
- *
- * AES:
- * CPU supports AES instructions. These instructions are only
- * available for 32-bit applications running on ARMv8 CPU.
- *
- * CRC32:
- * CPU supports CRC32 instructions. These instructions are only
- * available for 32-bit applications running on ARMv8 CPU.
- *
- * SHA2:
- * CPU supports SHA2 instructions. These instructions are only
- * available for 32-bit applications running on ARMv8 CPU.
- *
- * SHA1:
- * CPU supports SHA1 instructions. These instructions are only
- * available for 32-bit applications running on ARMv8 CPU.
- *
- * PMULL:
- * CPU supports 64-bit PMULL and PMULL2 instructions. These
- * instructions are only available for 32-bit applications
- * running on ARMv8 CPU.
- *
- * If you want to tell the compiler to generate code that targets one of
- * the feature set above, you should probably use one of the following
- * flags (for more details, see technical note at the end of this file):
- *
- * -mfpu=vfp
- * -mfpu=vfpv2
- * These are equivalent and tell GCC to use VFPv2 instructions for
- * floating-point operations. Use this if you want your code to
- * run on *some* ARMv6 devices, and any ARMv7-A device supported
- * by Android.
- *
- * Generated code requires VFPv2 feature.
- *
- * -mfpu=vfpv3-d16
- * Tell GCC to use VFPv3 instructions (using only 16 FPU registers).
- * This should be generic code that runs on any CPU that supports the
- * 'armeabi-v7a' Android ABI. Note that no ARMv6 CPU supports this.
- *
- * Generated code requires VFPv3 feature.
- *
- * -mfpu=vfpv3
- * Tell GCC to use VFPv3 instructions with 32 FPU registers.
- * Generated code requires VFPv3|VFP_D32 features.
- *
- * -mfpu=neon
- * Tell GCC to use VFPv3 instructions with 32 FPU registers, and
- * also support NEON intrinsics (see <arm_neon.h>).
- * Generated code requires VFPv3|VFP_D32|NEON features.
- *
- * -mfpu=vfpv4-d16
- * Generated code requires VFPv3|VFP_FP16|VFP_FMA features.
- *
- * -mfpu=vfpv4
- * Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32 features.
- *
- * -mfpu=neon-vfpv4
- * Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32|NEON|NEON_FMA
- * features.
- *
- * -mcpu=cortex-a7
- * -mcpu=cortex-a15
- * Generated code requires VFPv3|VFP_FP16|VFP_FMA|VFP_D32|
- * NEON|NEON_FMA|IDIV_ARM|IDIV_THUMB2
- * This flag implies -mfpu=neon-vfpv4.
- *
- * -mcpu=iwmmxt
- * Allows the use of iWMMXt instrinsics with GCC.
- *
- * IMPORTANT NOTE: These flags should only be tested when
- * android_getCpuFamily() returns ANDROID_CPU_FAMILY_ARM, i.e. this is a
- * 32-bit process.
- *
- * When running a 64-bit ARM process on an ARMv8 CPU,
- * android_getCpuFeatures() will return a different set of bitflags
- */
-enum {
- ANDROID_CPU_ARM_FEATURE_ARMv7 = (1 << 0),
- ANDROID_CPU_ARM_FEATURE_VFPv3 = (1 << 1),
- ANDROID_CPU_ARM_FEATURE_NEON = (1 << 2),
- ANDROID_CPU_ARM_FEATURE_LDREX_STREX = (1 << 3),
- ANDROID_CPU_ARM_FEATURE_VFPv2 = (1 << 4),
- ANDROID_CPU_ARM_FEATURE_VFP_D32 = (1 << 5),
- ANDROID_CPU_ARM_FEATURE_VFP_FP16 = (1 << 6),
- ANDROID_CPU_ARM_FEATURE_VFP_FMA = (1 << 7),
- ANDROID_CPU_ARM_FEATURE_NEON_FMA = (1 << 8),
- ANDROID_CPU_ARM_FEATURE_IDIV_ARM = (1 << 9),
- ANDROID_CPU_ARM_FEATURE_IDIV_THUMB2 = (1 << 10),
- ANDROID_CPU_ARM_FEATURE_iWMMXt = (1 << 11),
- ANDROID_CPU_ARM_FEATURE_AES = (1 << 12),
- ANDROID_CPU_ARM_FEATURE_PMULL = (1 << 13),
- ANDROID_CPU_ARM_FEATURE_SHA1 = (1 << 14),
- ANDROID_CPU_ARM_FEATURE_SHA2 = (1 << 15),
- ANDROID_CPU_ARM_FEATURE_CRC32 = (1 << 16),
-};
-
-/* The bit flags corresponding to the output of android_getCpuFeatures()
- * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_ARM64. Value details
- * are:
- *
- * FP:
- * CPU has Floating-point unit.
- *
- * ASIMD:
- * CPU has Advanced SIMD unit.
- *
- * AES:
- * CPU supports AES instructions.
- *
- * CRC32:
- * CPU supports CRC32 instructions.
- *
- * SHA2:
- * CPU supports SHA2 instructions.
- *
- * SHA1:
- * CPU supports SHA1 instructions.
- *
- * PMULL:
- * CPU supports 64-bit PMULL and PMULL2 instructions.
- */
-enum {
- ANDROID_CPU_ARM64_FEATURE_FP = (1 << 0),
- ANDROID_CPU_ARM64_FEATURE_ASIMD = (1 << 1),
- ANDROID_CPU_ARM64_FEATURE_AES = (1 << 2),
- ANDROID_CPU_ARM64_FEATURE_PMULL = (1 << 3),
- ANDROID_CPU_ARM64_FEATURE_SHA1 = (1 << 4),
- ANDROID_CPU_ARM64_FEATURE_SHA2 = (1 << 5),
- ANDROID_CPU_ARM64_FEATURE_CRC32 = (1 << 6),
-};
-
-/* The bit flags corresponding to the output of android_getCpuFeatures()
- * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_X86 or
- * ANDROID_CPU_FAMILY_X86_64.
- */
-enum {
- ANDROID_CPU_X86_FEATURE_SSSE3 = (1 << 0),
- ANDROID_CPU_X86_FEATURE_POPCNT = (1 << 1),
- ANDROID_CPU_X86_FEATURE_MOVBE = (1 << 2),
- ANDROID_CPU_X86_FEATURE_SSE4_1 = (1 << 3),
- ANDROID_CPU_X86_FEATURE_SSE4_2 = (1 << 4),
- ANDROID_CPU_X86_FEATURE_AES_NI = (1 << 5),
- ANDROID_CPU_X86_FEATURE_AVX = (1 << 6),
- ANDROID_CPU_X86_FEATURE_RDRAND = (1 << 7),
- ANDROID_CPU_X86_FEATURE_AVX2 = (1 << 8),
- ANDROID_CPU_X86_FEATURE_SHA_NI = (1 << 9),
-};
-
-/* The bit flags corresponding to the output of android_getCpuFeatures()
- * when android_getCpuFamily() returns ANDROID_CPU_FAMILY_MIPS
- * or ANDROID_CPU_FAMILY_MIPS64. Values are:
- *
- * R6:
- * CPU executes MIPS Release 6 instructions natively, and
- * supports obsoleted R1..R5 instructions only via kernel traps.
- *
- * MSA:
- * CPU supports Mips SIMD Architecture instructions.
- */
-enum {
- ANDROID_CPU_MIPS_FEATURE_R6 = (1 << 0),
- ANDROID_CPU_MIPS_FEATURE_MSA = (1 << 1),
-};
-
-
-/* Return the number of CPU cores detected on this device. */
-extern int android_getCpuCount(void);
-
-/* The following is used to force the CPU count and features
- * mask in sandboxed processes. Under 4.1 and higher, these processes
- * cannot access /proc, which is the only way to get information from
- * the kernel about the current hardware (at least on ARM).
- *
- * It _must_ be called only once, and before any android_getCpuXXX
- * function, any other case will fail.
- *
- * This function return 1 on success, and 0 on failure.
- */
-extern int android_setCpu(int cpu_count,
- uint64_t cpu_features);
-
-#ifdef __arm__
-/* Retrieve the ARM 32-bit CPUID value from the kernel.
- * Note that this cannot work on sandboxed processes under 4.1 and
- * higher, unless you called android_setCpuArm() before.
- */
-extern uint32_t android_getCpuIdArm(void);
-
-/* An ARM-specific variant of android_setCpu() that also allows you
- * to set the ARM CPUID field.
- */
-extern int android_setCpuArm(int cpu_count,
- uint64_t cpu_features,
- uint32_t cpu_id);
-#endif
-
-__END_DECLS
-
-#endif /* CPU_FEATURES_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-25 16:59:47 +0000