1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright (C) Cavium, Inc. 2015.
3 * Copyright(c) 2015 RehiveTech. All rights reserved.
6 #include "rte_cpuflags.h"
23 #define AT_PLATFORM 15
34 typedef uint32_t hwcap_registers_t[REG_MAX];
37 * Struct to hold a processor feature entry
39 struct feature_entry {
42 #define CPU_FLAG_NAME_MAX_LEN 64
43 char name[CPU_FLAG_NAME_MAX_LEN];
46 #define FEAT_DEF(name, reg, bit) \
47 [RTE_CPUFLAG_##name] = {reg, bit, #name},
50 #define PLATFORM_STR "v7l"
51 typedef Elf32_auxv_t _Elfx_auxv_t;
53 const struct feature_entry rte_cpu_feature_table[] = {
54 FEAT_DEF(SWP, REG_HWCAP, 0)
55 FEAT_DEF(HALF, REG_HWCAP, 1)
56 FEAT_DEF(THUMB, REG_HWCAP, 2)
57 FEAT_DEF(A26BIT, REG_HWCAP, 3)
58 FEAT_DEF(FAST_MULT, REG_HWCAP, 4)
59 FEAT_DEF(FPA, REG_HWCAP, 5)
60 FEAT_DEF(VFP, REG_HWCAP, 6)
61 FEAT_DEF(EDSP, REG_HWCAP, 7)
62 FEAT_DEF(JAVA, REG_HWCAP, 8)
63 FEAT_DEF(IWMMXT, REG_HWCAP, 9)
64 FEAT_DEF(CRUNCH, REG_HWCAP, 10)
65 FEAT_DEF(THUMBEE, REG_HWCAP, 11)
66 FEAT_DEF(NEON, REG_HWCAP, 12)
67 FEAT_DEF(VFPv3, REG_HWCAP, 13)
68 FEAT_DEF(VFPv3D16, REG_HWCAP, 14)
69 FEAT_DEF(TLS, REG_HWCAP, 15)
70 FEAT_DEF(VFPv4, REG_HWCAP, 16)
71 FEAT_DEF(IDIVA, REG_HWCAP, 17)
72 FEAT_DEF(IDIVT, REG_HWCAP, 18)
73 FEAT_DEF(VFPD32, REG_HWCAP, 19)
74 FEAT_DEF(LPAE, REG_HWCAP, 20)
75 FEAT_DEF(EVTSTRM, REG_HWCAP, 21)
76 FEAT_DEF(AES, REG_HWCAP2, 0)
77 FEAT_DEF(PMULL, REG_HWCAP2, 1)
78 FEAT_DEF(SHA1, REG_HWCAP2, 2)
79 FEAT_DEF(SHA2, REG_HWCAP2, 3)
80 FEAT_DEF(CRC32, REG_HWCAP2, 4)
81 FEAT_DEF(V7L, REG_PLATFORM, 0)
84 #elif defined RTE_ARCH_ARM64
85 #define PLATFORM_STR "aarch64"
86 typedef Elf64_auxv_t _Elfx_auxv_t;
88 const struct feature_entry rte_cpu_feature_table[] = {
89 FEAT_DEF(FP, REG_HWCAP, 0)
90 FEAT_DEF(NEON, REG_HWCAP, 1)
91 FEAT_DEF(EVTSTRM, REG_HWCAP, 2)
92 FEAT_DEF(AES, REG_HWCAP, 3)
93 FEAT_DEF(PMULL, REG_HWCAP, 4)
94 FEAT_DEF(SHA1, REG_HWCAP, 5)
95 FEAT_DEF(SHA2, REG_HWCAP, 6)
96 FEAT_DEF(CRC32, REG_HWCAP, 7)
97 FEAT_DEF(ATOMICS, REG_HWCAP, 8)
98 FEAT_DEF(AARCH64, REG_PLATFORM, 1)
100 #endif /* RTE_ARCH */
103 * Read AUXV software register and get cpu features for ARM
106 rte_cpu_get_features(hwcap_registers_t out)
111 auxv_fd = open("/proc/self/auxv", O_RDONLY);
112 assert(auxv_fd != -1);
113 while (read(auxv_fd, &auxv, sizeof(auxv)) == sizeof(auxv)) {
114 if (auxv.a_type == AT_HWCAP) {
115 out[REG_HWCAP] = auxv.a_un.a_val;
116 } else if (auxv.a_type == AT_HWCAP2) {
117 out[REG_HWCAP2] = auxv.a_un.a_val;
118 } else if (auxv.a_type == AT_PLATFORM) {
119 if (!strcmp((const char *)auxv.a_un.a_val, PLATFORM_STR))
120 out[REG_PLATFORM] = 0x0001;
127 * Checks if a particular flag is available on current machine.
130 rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
132 const struct feature_entry *feat;
133 hwcap_registers_t regs = {0};
135 if (feature >= RTE_CPUFLAG_NUMFLAGS)
138 feat = &rte_cpu_feature_table[feature];
139 if (feat->reg == REG_NONE)
142 rte_cpu_get_features(regs);
143 return (regs[feat->reg] >> feat->bit) & 1;
147 rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
149 if (feature >= RTE_CPUFLAG_NUMFLAGS)
151 return rte_cpu_feature_table[feature].name;