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eal/arm: add CPU flags for ARMv8

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Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
This commit is contained in:
Jerin Jacob 2015-11-06 15:10:21 +05:30 committed by Thomas Monjalon
parent c0da085b7e
commit 97523f822b
3 changed files with 182 additions and 0 deletions
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26
app/test/test_cpuflags.c
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@ -120,6 +120,32 @@ test_cpuflags(void)
CHECK_FOR_FLAG(RTE_CPUFLAG_NEON);
#endif
#if defined(RTE_ARCH_ARM64)
printf("Check for FP:\t\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_FP);
printf("Check for ASIMD:\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_NEON);
printf("Check for EVTSTRM:\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_EVTSTRM);
printf("Check for AES:\t\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_AES);
printf("Check for PMULL:\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_PMULL);
printf("Check for SHA1:\t\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_SHA1);
printf("Check for SHA2:\t\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_SHA2);
printf("Check for CRC32:\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_CRC32);
#endif
#if defined(RTE_ARCH_X86_64) || defined(RTE_ARCH_I686)
printf("Check for SSE:\t\t");
CHECK_FOR_FLAG(RTE_CPUFLAG_SSE);

4
lib/librte_eal/common/include/arch/arm/rte_cpuflags.h
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@ -33,6 +33,10 @@
#ifndef _RTE_CPUFLAGS_ARM_H_
#define _RTE_CPUFLAGS_ARM_H_
#ifdef RTE_ARCH_64
#include <rte_cpuflags_64.h>
#else
#include <rte_cpuflags_32.h>
#endif
#endif /* _RTE_CPUFLAGS_ARM_H_ */

152
lib/librte_eal/common/include/arch/arm/rte_cpuflags_64.h Normal file
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@ -0,0 +1,152 @@
/*
* BSD LICENSE
*
* Copyright (C) Cavium networks Ltd. 2015.
*
* 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.
* * Neither the name of Cavium networks nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 _RTE_CPUFLAGS_ARM64_H_
#define _RTE_CPUFLAGS_ARM64_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <elf.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include "generic/rte_cpuflags.h"
#ifndef AT_HWCAP
#define AT_HWCAP 16
#endif
#ifndef AT_HWCAP2
#define AT_HWCAP2 26
#endif
#ifndef AT_PLATFORM
#define AT_PLATFORM 15
#endif
/* software based registers */
enum cpu_register_t {
REG_HWCAP = 0,
REG_HWCAP2,
REG_PLATFORM,
};
/**
* Enumeration of all CPU features supported
*/
enum rte_cpu_flag_t {
RTE_CPUFLAG_FP = 0,
RTE_CPUFLAG_NEON,
RTE_CPUFLAG_EVTSTRM,
RTE_CPUFLAG_AES,
RTE_CPUFLAG_PMULL,
RTE_CPUFLAG_SHA1,
RTE_CPUFLAG_SHA2,
RTE_CPUFLAG_CRC32,
RTE_CPUFLAG_AARCH64,
/* The last item */
RTE_CPUFLAG_NUMFLAGS,/**< This should always be the last! */
};
static const struct feature_entry cpu_feature_table[] = {
FEAT_DEF(FP, 0x00000001, 0, REG_HWCAP, 0)
FEAT_DEF(NEON, 0x00000001, 0, REG_HWCAP, 1)
FEAT_DEF(EVTSTRM, 0x00000001, 0, REG_HWCAP, 2)
FEAT_DEF(AES, 0x00000001, 0, REG_HWCAP, 3)
FEAT_DEF(PMULL, 0x00000001, 0, REG_HWCAP, 4)
FEAT_DEF(SHA1, 0x00000001, 0, REG_HWCAP, 5)
FEAT_DEF(SHA2, 0x00000001, 0, REG_HWCAP, 6)
FEAT_DEF(CRC32, 0x00000001, 0, REG_HWCAP, 7)
FEAT_DEF(AARCH64, 0x00000001, 0, REG_PLATFORM, 1)
};
/*
* Read AUXV software register and get cpu features for ARM
*/
static inline void
rte_cpu_get_features(__attribute__((unused)) uint32_t leaf,
__attribute__((unused)) uint32_t subleaf,
cpuid_registers_t out)
{
int auxv_fd;
Elf64_auxv_t auxv;
auxv_fd = open("/proc/self/auxv", O_RDONLY);
assert(auxv_fd);
while (read(auxv_fd, &auxv,
sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t)) {
if (auxv.a_type == AT_HWCAP) {
out[REG_HWCAP] = auxv.a_un.a_val;
} else if (auxv.a_type == AT_HWCAP2) {
out[REG_HWCAP2] = auxv.a_un.a_val;
} else if (auxv.a_type == AT_PLATFORM) {
if (!strcmp((const char *)auxv.a_un.a_val, "aarch64"))
out[REG_PLATFORM] = 0x0001;
}
}
}
/*
* Checks if a particular flag is available on current machine.
*/
static inline int
rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
{
const struct feature_entry *feat;
cpuid_registers_t regs = {0};
if (feature >= RTE_CPUFLAG_NUMFLAGS)
/* Flag does not match anything in the feature tables */
return -ENOENT;
feat = &cpu_feature_table[feature];
if (!feat->leaf)
/* This entry in the table wasn't filled out! */
return -EFAULT;
/* get the cpuid leaf containing the desired feature */
rte_cpu_get_features(feat->leaf, feat->subleaf, regs);
/* check if the feature is enabled */
return (regs[feat->reg] >> feat->bit) & 1;
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_CPUFLAGS_ARM64_H_ */