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33 #ifndef _RTE_CPUFLAGS_ARM64_H_
34 #define _RTE_CPUFLAGS_ARM64_H_
46 #include "generic/rte_cpuflags.h"
57 #define AT_PLATFORM 15
60 /* software based registers */
68 * Enumeration of all CPU features supported
81 RTE_CPUFLAG_NUMFLAGS,/**< This should always be the last! */
84 static const struct feature_entry cpu_feature_table[] = {
85 FEAT_DEF(FP, 0x00000001, 0, REG_HWCAP, 0)
86 FEAT_DEF(NEON, 0x00000001, 0, REG_HWCAP, 1)
87 FEAT_DEF(EVTSTRM, 0x00000001, 0, REG_HWCAP, 2)
88 FEAT_DEF(AES, 0x00000001, 0, REG_HWCAP, 3)
89 FEAT_DEF(PMULL, 0x00000001, 0, REG_HWCAP, 4)
90 FEAT_DEF(SHA1, 0x00000001, 0, REG_HWCAP, 5)
91 FEAT_DEF(SHA2, 0x00000001, 0, REG_HWCAP, 6)
92 FEAT_DEF(CRC32, 0x00000001, 0, REG_HWCAP, 7)
93 FEAT_DEF(AARCH64, 0x00000001, 0, REG_PLATFORM, 1)
97 * Read AUXV software register and get cpu features for ARM
100 rte_cpu_get_features(__attribute__((unused)) uint32_t leaf,
101 __attribute__((unused)) uint32_t subleaf,
102 cpuid_registers_t out)
107 auxv_fd = open("/proc/self/auxv", O_RDONLY);
109 while (read(auxv_fd, &auxv,
110 sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t)) {
111 if (auxv.a_type == AT_HWCAP) {
112 out[REG_HWCAP] = auxv.a_un.a_val;
113 } else if (auxv.a_type == AT_HWCAP2) {
114 out[REG_HWCAP2] = auxv.a_un.a_val;
115 } else if (auxv.a_type == AT_PLATFORM) {
116 if (!strcmp((const char *)auxv.a_un.a_val, "aarch64"))
117 out[REG_PLATFORM] = 0x0001;
123 * Checks if a particular flag is available on current machine.
126 rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
128 const struct feature_entry *feat;
129 cpuid_registers_t regs = {0};
131 if (feature >= RTE_CPUFLAG_NUMFLAGS)
132 /* Flag does not match anything in the feature tables */
135 feat = &cpu_feature_table[feature];
138 /* This entry in the table wasn't filled out! */
141 /* get the cpuid leaf containing the desired feature */
142 rte_cpu_get_features(feat->leaf, feat->subleaf, regs);
144 /* check if the feature is enabled */
145 return (regs[feat->reg] >> feat->bit) & 1;
152 #endif /* _RTE_CPUFLAGS_ARM64_H_ */