mirror of https://github.com/F-Stack/f-stack.git
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2022 Loongson Technology Corporation Limited
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*/
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#include "rte_cpuflags.h"
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#include <elf.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <unistd.h>
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#include <string.h>
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/* Symbolic values for the entries in the auxiliary table */
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#define AT_HWCAP 16
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/* software based registers */
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enum cpu_register_t {
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REG_NONE = 0,
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REG_HWCAP,
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REG_MAX
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};
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typedef uint32_t hwcap_registers_t[REG_MAX];
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struct feature_entry {
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uint32_t reg;
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uint32_t bit;
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#define CPU_FLAG_NAME_MAX_LEN 64
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char name[CPU_FLAG_NAME_MAX_LEN];
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};
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#define FEAT_DEF(name, reg, bit) \
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[RTE_CPUFLAG_##name] = {reg, bit, #name},
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const struct feature_entry rte_cpu_feature_table[] = {
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FEAT_DEF(CPUCFG, REG_HWCAP, 0)
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FEAT_DEF(LAM, REG_HWCAP, 1)
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FEAT_DEF(UAL, REG_HWCAP, 2)
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FEAT_DEF(FPU, REG_HWCAP, 3)
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FEAT_DEF(LSX, REG_HWCAP, 4)
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FEAT_DEF(LASX, REG_HWCAP, 5)
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FEAT_DEF(CRC32, REG_HWCAP, 6)
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FEAT_DEF(COMPLEX, REG_HWCAP, 7)
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FEAT_DEF(CRYPTO, REG_HWCAP, 8)
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FEAT_DEF(LVZ, REG_HWCAP, 9)
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FEAT_DEF(LBT_X86, REG_HWCAP, 10)
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FEAT_DEF(LBT_ARM, REG_HWCAP, 11)
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FEAT_DEF(LBT_MIPS, REG_HWCAP, 12)
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};
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/*
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* Read AUXV software register and get cpu features for LoongArch
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*/
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static void
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rte_cpu_get_features(hwcap_registers_t out)
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{
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out[REG_HWCAP] = rte_cpu_getauxval(AT_HWCAP);
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}
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/*
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* Checks if a particular flag is available on current machine.
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*/
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int
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rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
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{
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const struct feature_entry *feat;
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hwcap_registers_t regs = {0};
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if (feature >= RTE_CPUFLAG_NUMFLAGS)
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return -ENOENT;
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feat = &rte_cpu_feature_table[feature];
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if (feat->reg == REG_NONE)
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return -EFAULT;
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rte_cpu_get_features(regs);
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return (regs[feat->reg] >> feat->bit) & 1;
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}
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const char *
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rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
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{
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if (feature >= RTE_CPUFLAG_NUMFLAGS)
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return NULL;
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return rte_cpu_feature_table[feature].name;
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}
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void
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rte_cpu_get_intrinsics_support(struct rte_cpu_intrinsics *intrinsics)
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{
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memset(intrinsics, 0, sizeof(*intrinsics));
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}
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