-/**
- * Enumeration of CPU registers
- */
-enum cpu_register_t {
- REG_EAX = 0,
- REG_EBX,
- REG_ECX,
- REG_EDX,
-};
-
-/**
- * Parameters for CPUID instruction
- */
-struct cpuid_parameters_t {
- uint32_t eax;
- uint32_t ebx;
- uint32_t ecx;
- uint32_t edx;
- enum cpu_register_t return_register;
-};
-
-#define CPU_FLAG_NAME_MAX_LEN 64
-
-/**
- * Struct to hold a processor feature entry
- */
-struct feature_entry {
- enum rte_cpu_flag_t feature; /**< feature name */
- char name[CPU_FLAG_NAME_MAX_LEN]; /**< String for printing */
- struct cpuid_parameters_t params; /**< cpuid parameters */
- uint32_t feature_mask; /**< bitmask for feature */
-};
-
-#define FEAT_DEF(f) RTE_CPUFLAG_##f, #f
-
-/**
- * An array that holds feature entries
- */
-static const struct feature_entry cpu_feature_table[] = {
- {FEAT_DEF(SSE3), {0x1, 0, 0, 0, REG_ECX}, 0x00000001},
- {FEAT_DEF(PCLMULQDQ), {0x1, 0, 0, 0, REG_ECX}, 0x00000002},
- {FEAT_DEF(DTES64), {0x1, 0, 0, 0, REG_ECX}, 0x00000004},
- {FEAT_DEF(MONITOR), {0x1, 0, 0, 0, REG_ECX}, 0x00000008},
- {FEAT_DEF(DS_CPL), {0x1, 0, 0, 0, REG_ECX}, 0x00000010},
- {FEAT_DEF(VMX), {0x1, 0, 0, 0, REG_ECX}, 0x00000020},
- {FEAT_DEF(SMX), {0x1, 0, 0, 0, REG_ECX}, 0x00000040},
- {FEAT_DEF(EIST), {0x1, 0, 0, 0, REG_ECX}, 0x00000080},
- {FEAT_DEF(TM2), {0x1, 0, 0, 0, REG_ECX}, 0x00000100},
- {FEAT_DEF(SSSE3), {0x1, 0, 0, 0, REG_ECX}, 0x00000200},
- {FEAT_DEF(CNXT_ID), {0x1, 0, 0, 0, REG_ECX}, 0x00000400},
- {FEAT_DEF(FMA), {0x1, 0, 0, 0, REG_ECX}, 0x00001000},
- {FEAT_DEF(CMPXCHG16B), {0x1, 0, 0, 0, REG_ECX}, 0x00002000},
- {FEAT_DEF(XTPR), {0x1, 0, 0, 0, REG_ECX}, 0x00004000},
- {FEAT_DEF(PDCM), {0x1, 0, 0, 0, REG_ECX}, 0x00008000},
- {FEAT_DEF(PCID), {0x1, 0, 0, 0, REG_ECX}, 0x00020000},
- {FEAT_DEF(DCA), {0x1, 0, 0, 0, REG_ECX}, 0x00040000},
- {FEAT_DEF(SSE4_1), {0x1, 0, 0, 0, REG_ECX}, 0x00080000},
- {FEAT_DEF(SSE4_2), {0x1, 0, 0, 0, REG_ECX}, 0x00100000},
- {FEAT_DEF(X2APIC), {0x1, 0, 0, 0, REG_ECX}, 0x00200000},
- {FEAT_DEF(MOVBE), {0x1, 0, 0, 0, REG_ECX}, 0x00400000},
- {FEAT_DEF(POPCNT), {0x1, 0, 0, 0, REG_ECX}, 0x00800000},
- {FEAT_DEF(TSC_DEADLINE), {0x1, 0, 0, 0, REG_ECX}, 0x01000000},
- {FEAT_DEF(AES), {0x1, 0, 0, 0, REG_ECX}, 0x02000000},
- {FEAT_DEF(XSAVE), {0x1, 0, 0, 0, REG_ECX}, 0x04000000},
- {FEAT_DEF(OSXSAVE), {0x1, 0, 0, 0, REG_ECX}, 0x08000000},
- {FEAT_DEF(AVX), {0x1, 0, 0, 0, REG_ECX}, 0x10000000},
- {FEAT_DEF(F16C), {0x1, 0, 0, 0, REG_ECX}, 0x20000000},
- {FEAT_DEF(RDRAND), {0x1, 0, 0, 0, REG_ECX}, 0x40000000},
-
- {FEAT_DEF(FPU), {0x1, 0, 0, 0, REG_EDX}, 0x00000001},
- {FEAT_DEF(VME), {0x1, 0, 0, 0, REG_EDX}, 0x00000002},
- {FEAT_DEF(DE), {0x1, 0, 0, 0, REG_EDX}, 0x00000004},
- {FEAT_DEF(PSE), {0x1, 0, 0, 0, REG_EDX}, 0x00000008},
- {FEAT_DEF(TSC), {0x1, 0, 0, 0, REG_EDX}, 0x00000010},
- {FEAT_DEF(MSR), {0x1, 0, 0, 0, REG_EDX}, 0x00000020},
- {FEAT_DEF(PAE), {0x1, 0, 0, 0, REG_EDX}, 0x00000040},
- {FEAT_DEF(MCE), {0x1, 0, 0, 0, REG_EDX}, 0x00000080},
- {FEAT_DEF(CX8), {0x1, 0, 0, 0, REG_EDX}, 0x00000100},
- {FEAT_DEF(APIC), {0x1, 0, 0, 0, REG_EDX}, 0x00000200},
- {FEAT_DEF(SEP), {0x1, 0, 0, 0, REG_EDX}, 0x00000800},
- {FEAT_DEF(MTRR), {0x1, 0, 0, 0, REG_EDX}, 0x00001000},
- {FEAT_DEF(PGE), {0x1, 0, 0, 0, REG_EDX}, 0x00002000},
- {FEAT_DEF(MCA), {0x1, 0, 0, 0, REG_EDX}, 0x00004000},
- {FEAT_DEF(CMOV), {0x1, 0, 0, 0, REG_EDX}, 0x00008000},
- {FEAT_DEF(PAT), {0x1, 0, 0, 0, REG_EDX}, 0x00010000},
- {FEAT_DEF(PSE36), {0x1, 0, 0, 0, REG_EDX}, 0x00020000},
- {FEAT_DEF(PSN), {0x1, 0, 0, 0, REG_EDX}, 0x00040000},
- {FEAT_DEF(CLFSH), {0x1, 0, 0, 0, REG_EDX}, 0x00080000},
- {FEAT_DEF(DS), {0x1, 0, 0, 0, REG_EDX}, 0x00200000},
- {FEAT_DEF(ACPI), {0x1, 0, 0, 0, REG_EDX}, 0x00400000},
- {FEAT_DEF(MMX), {0x1, 0, 0, 0, REG_EDX}, 0x00800000},
- {FEAT_DEF(FXSR), {0x1, 0, 0, 0, REG_EDX}, 0x01000000},
- {FEAT_DEF(SSE), {0x1, 0, 0, 0, REG_EDX}, 0x02000000},
- {FEAT_DEF(SSE2), {0x1, 0, 0, 0, REG_EDX}, 0x04000000},
- {FEAT_DEF(SS), {0x1, 0, 0, 0, REG_EDX}, 0x08000000},
- {FEAT_DEF(HTT), {0x1, 0, 0, 0, REG_EDX}, 0x10000000},
- {FEAT_DEF(TM), {0x1, 0, 0, 0, REG_EDX}, 0x20000000},
- {FEAT_DEF(PBE), {0x1, 0, 0, 0, REG_EDX}, 0x80000000},
-
- {FEAT_DEF(DIGTEMP), {0x6, 0, 0, 0, REG_EAX}, 0x00000001},
- {FEAT_DEF(TRBOBST), {0x6, 0, 0, 0, REG_EAX}, 0x00000002},
- {FEAT_DEF(ARAT), {0x6, 0, 0, 0, REG_EAX}, 0x00000004},
- {FEAT_DEF(PLN), {0x6, 0, 0, 0, REG_EAX}, 0x00000010},
- {FEAT_DEF(ECMD), {0x6, 0, 0, 0, REG_EAX}, 0x00000020},
- {FEAT_DEF(PTM), {0x6, 0, 0, 0, REG_EAX}, 0x00000040},
-
- {FEAT_DEF(MPERF_APERF_MSR), {0x6, 0, 0, 0, REG_ECX}, 0x00000001},
- {FEAT_DEF(ACNT2), {0x6, 0, 0, 0, REG_ECX}, 0x00000002},
- {FEAT_DEF(ENERGY_EFF), {0x6, 0, 0, 0, REG_ECX}, 0x00000008},
-
- {FEAT_DEF(FSGSBASE), {0x7, 0, 0, 0, REG_EBX}, 0x00000001},
- {FEAT_DEF(BMI1), {0x7, 0, 0, 0, REG_EBX}, 0x00000004},
- {FEAT_DEF(AVX2), {0x7, 0, 0, 0, REG_EBX}, 0x00000010},
- {FEAT_DEF(SMEP), {0x7, 0, 0, 0, REG_EBX}, 0x00000040},
- {FEAT_DEF(BMI2), {0x7, 0, 0, 0, REG_EBX}, 0x00000080},
- {FEAT_DEF(ERMS), {0x7, 0, 0, 0, REG_EBX}, 0x00000100},
- {FEAT_DEF(INVPCID), {0x7, 0, 0, 0, REG_EBX}, 0x00000400},
-
- {FEAT_DEF(LAHF_SAHF), {0x80000001, 0, 0, 0, REG_ECX}, 0x00000001},
- {FEAT_DEF(LZCNT), {0x80000001, 0, 0, 0, REG_ECX}, 0x00000010},
-
- {FEAT_DEF(SYSCALL), {0x80000001, 0, 0, 0, REG_EDX}, 0x00000800},
- {FEAT_DEF(XD), {0x80000001, 0, 0, 0, REG_EDX}, 0x00100000},
- {FEAT_DEF(1GB_PG), {0x80000001, 0, 0, 0, REG_EDX}, 0x04000000},
- {FEAT_DEF(RDTSCP), {0x80000001, 0, 0, 0, REG_EDX}, 0x08000000},
- {FEAT_DEF(EM64T), {0x80000001, 0, 0, 0, REG_EDX}, 0x20000000},
-
- {FEAT_DEF(INVTSC), {0x80000007, 0, 0, 0, REG_EDX}, 0x00000100},
-};
-
-/*
- * Execute CPUID instruction and get contents of a specific register
- *
- * This function, when compiled with GCC, will generate architecture-neutral
- * code, as per GCC manual.
- */
-static inline int
-rte_cpu_get_features(struct cpuid_parameters_t params)
-{
- int eax, ebx, ecx, edx; /* registers */
-
- asm volatile ("cpuid"
- /* output */
- : "=a" (eax),
- "=b" (ebx),
- "=c" (ecx),
- "=d" (edx)
- /* input */
- : "a" (params.eax),
- "b" (params.ebx),
- "c" (params.ecx),
- "d" (params.edx));
-
- switch (params.return_register) {
- case REG_EAX:
- return eax;
- case REG_EBX:
- return ebx;
- case REG_ECX:
- return ecx;
- case REG_EDX:
- return edx;
- default:
- return 0;
- }
-}
-
-/*
- * Checks if a particular flag is available on current machine.
- */
-int
-rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
-{
- int value;
-
- if (feature >= RTE_CPUFLAG_NUMFLAGS)
- /* Flag does not match anything in the feature tables */
- return -ENOENT;
-
- /* get value of the register containing the desired feature */
- value = rte_cpu_get_features(cpu_feature_table[feature].params);
-
- /* check if the feature is enabled */
- return (cpu_feature_table[feature].feature_mask & value) > 0;
-}
-