--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * 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 Intel Corporation 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.
+ */
+
+#include "rte_cpuflags.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdint.h>
+
+enum cpu_register_t {
+ RTE_REG_EAX = 0,
+ RTE_REG_EBX,
+ RTE_REG_ECX,
+ RTE_REG_EDX,
+};
+
+typedef uint32_t cpuid_registers_t[4];
+
+/**
+ * Struct to hold a processor feature entry
+ */
+struct feature_entry {
+ uint32_t leaf; /**< cpuid leaf */
+ uint32_t subleaf; /**< cpuid subleaf */
+ uint32_t reg; /**< cpuid register */
+ uint32_t bit; /**< cpuid register bit */
+#define CPU_FLAG_NAME_MAX_LEN 64
+ char name[CPU_FLAG_NAME_MAX_LEN]; /**< String for printing */
+};
+
+#define FEAT_DEF(name, leaf, subleaf, reg, bit) \
+ [RTE_CPUFLAG_##name] = {leaf, subleaf, reg, bit, #name },
+
+const struct feature_entry rte_cpu_feature_table[] = {
+ FEAT_DEF(SSE3, 0x00000001, 0, RTE_REG_ECX, 0)
+ FEAT_DEF(PCLMULQDQ, 0x00000001, 0, RTE_REG_ECX, 1)
+ FEAT_DEF(DTES64, 0x00000001, 0, RTE_REG_ECX, 2)
+ FEAT_DEF(MONITOR, 0x00000001, 0, RTE_REG_ECX, 3)
+ FEAT_DEF(DS_CPL, 0x00000001, 0, RTE_REG_ECX, 4)
+ FEAT_DEF(VMX, 0x00000001, 0, RTE_REG_ECX, 5)
+ FEAT_DEF(SMX, 0x00000001, 0, RTE_REG_ECX, 6)
+ FEAT_DEF(EIST, 0x00000001, 0, RTE_REG_ECX, 7)
+ FEAT_DEF(TM2, 0x00000001, 0, RTE_REG_ECX, 8)
+ FEAT_DEF(SSSE3, 0x00000001, 0, RTE_REG_ECX, 9)
+ FEAT_DEF(CNXT_ID, 0x00000001, 0, RTE_REG_ECX, 10)
+ FEAT_DEF(FMA, 0x00000001, 0, RTE_REG_ECX, 12)
+ FEAT_DEF(CMPXCHG16B, 0x00000001, 0, RTE_REG_ECX, 13)
+ FEAT_DEF(XTPR, 0x00000001, 0, RTE_REG_ECX, 14)
+ FEAT_DEF(PDCM, 0x00000001, 0, RTE_REG_ECX, 15)
+ FEAT_DEF(PCID, 0x00000001, 0, RTE_REG_ECX, 17)
+ FEAT_DEF(DCA, 0x00000001, 0, RTE_REG_ECX, 18)
+ FEAT_DEF(SSE4_1, 0x00000001, 0, RTE_REG_ECX, 19)
+ FEAT_DEF(SSE4_2, 0x00000001, 0, RTE_REG_ECX, 20)
+ FEAT_DEF(X2APIC, 0x00000001, 0, RTE_REG_ECX, 21)
+ FEAT_DEF(MOVBE, 0x00000001, 0, RTE_REG_ECX, 22)
+ FEAT_DEF(POPCNT, 0x00000001, 0, RTE_REG_ECX, 23)
+ FEAT_DEF(TSC_DEADLINE, 0x00000001, 0, RTE_REG_ECX, 24)
+ FEAT_DEF(AES, 0x00000001, 0, RTE_REG_ECX, 25)
+ FEAT_DEF(XSAVE, 0x00000001, 0, RTE_REG_ECX, 26)
+ FEAT_DEF(OSXSAVE, 0x00000001, 0, RTE_REG_ECX, 27)
+ FEAT_DEF(AVX, 0x00000001, 0, RTE_REG_ECX, 28)
+ FEAT_DEF(F16C, 0x00000001, 0, RTE_REG_ECX, 29)
+ FEAT_DEF(RDRAND, 0x00000001, 0, RTE_REG_ECX, 30)
+
+ FEAT_DEF(FPU, 0x00000001, 0, RTE_REG_EDX, 0)
+ FEAT_DEF(VME, 0x00000001, 0, RTE_REG_EDX, 1)
+ FEAT_DEF(DE, 0x00000001, 0, RTE_REG_EDX, 2)
+ FEAT_DEF(PSE, 0x00000001, 0, RTE_REG_EDX, 3)
+ FEAT_DEF(TSC, 0x00000001, 0, RTE_REG_EDX, 4)
+ FEAT_DEF(MSR, 0x00000001, 0, RTE_REG_EDX, 5)
+ FEAT_DEF(PAE, 0x00000001, 0, RTE_REG_EDX, 6)
+ FEAT_DEF(MCE, 0x00000001, 0, RTE_REG_EDX, 7)
+ FEAT_DEF(CX8, 0x00000001, 0, RTE_REG_EDX, 8)
+ FEAT_DEF(APIC, 0x00000001, 0, RTE_REG_EDX, 9)
+ FEAT_DEF(SEP, 0x00000001, 0, RTE_REG_EDX, 11)
+ FEAT_DEF(MTRR, 0x00000001, 0, RTE_REG_EDX, 12)
+ FEAT_DEF(PGE, 0x00000001, 0, RTE_REG_EDX, 13)
+ FEAT_DEF(MCA, 0x00000001, 0, RTE_REG_EDX, 14)
+ FEAT_DEF(CMOV, 0x00000001, 0, RTE_REG_EDX, 15)
+ FEAT_DEF(PAT, 0x00000001, 0, RTE_REG_EDX, 16)
+ FEAT_DEF(PSE36, 0x00000001, 0, RTE_REG_EDX, 17)
+ FEAT_DEF(PSN, 0x00000001, 0, RTE_REG_EDX, 18)
+ FEAT_DEF(CLFSH, 0x00000001, 0, RTE_REG_EDX, 19)
+ FEAT_DEF(DS, 0x00000001, 0, RTE_REG_EDX, 21)
+ FEAT_DEF(ACPI, 0x00000001, 0, RTE_REG_EDX, 22)
+ FEAT_DEF(MMX, 0x00000001, 0, RTE_REG_EDX, 23)
+ FEAT_DEF(FXSR, 0x00000001, 0, RTE_REG_EDX, 24)
+ FEAT_DEF(SSE, 0x00000001, 0, RTE_REG_EDX, 25)
+ FEAT_DEF(SSE2, 0x00000001, 0, RTE_REG_EDX, 26)
+ FEAT_DEF(SS, 0x00000001, 0, RTE_REG_EDX, 27)
+ FEAT_DEF(HTT, 0x00000001, 0, RTE_REG_EDX, 28)
+ FEAT_DEF(TM, 0x00000001, 0, RTE_REG_EDX, 29)
+ FEAT_DEF(PBE, 0x00000001, 0, RTE_REG_EDX, 31)
+
+ FEAT_DEF(DIGTEMP, 0x00000006, 0, RTE_REG_EAX, 0)
+ FEAT_DEF(TRBOBST, 0x00000006, 0, RTE_REG_EAX, 1)
+ FEAT_DEF(ARAT, 0x00000006, 0, RTE_REG_EAX, 2)
+ FEAT_DEF(PLN, 0x00000006, 0, RTE_REG_EAX, 4)
+ FEAT_DEF(ECMD, 0x00000006, 0, RTE_REG_EAX, 5)
+ FEAT_DEF(PTM, 0x00000006, 0, RTE_REG_EAX, 6)
+
+ FEAT_DEF(MPERF_APERF_MSR, 0x00000006, 0, RTE_REG_ECX, 0)
+ FEAT_DEF(ACNT2, 0x00000006, 0, RTE_REG_ECX, 1)
+ FEAT_DEF(ENERGY_EFF, 0x00000006, 0, RTE_REG_ECX, 3)
+
+ FEAT_DEF(FSGSBASE, 0x00000007, 0, RTE_REG_EBX, 0)
+ FEAT_DEF(BMI1, 0x00000007, 0, RTE_REG_EBX, 2)
+ FEAT_DEF(HLE, 0x00000007, 0, RTE_REG_EBX, 4)
+ FEAT_DEF(AVX2, 0x00000007, 0, RTE_REG_EBX, 5)
+ FEAT_DEF(SMEP, 0x00000007, 0, RTE_REG_EBX, 6)
+ FEAT_DEF(BMI2, 0x00000007, 0, RTE_REG_EBX, 7)
+ FEAT_DEF(ERMS, 0x00000007, 0, RTE_REG_EBX, 8)
+ FEAT_DEF(INVPCID, 0x00000007, 0, RTE_REG_EBX, 10)
+ FEAT_DEF(RTM, 0x00000007, 0, RTE_REG_EBX, 11)
+ FEAT_DEF(AVX512F, 0x00000007, 0, RTE_REG_EBX, 16)
+
+ FEAT_DEF(LAHF_SAHF, 0x80000001, 0, RTE_REG_ECX, 0)
+ FEAT_DEF(LZCNT, 0x80000001, 0, RTE_REG_ECX, 4)
+
+ FEAT_DEF(SYSCALL, 0x80000001, 0, RTE_REG_EDX, 11)
+ FEAT_DEF(XD, 0x80000001, 0, RTE_REG_EDX, 20)
+ FEAT_DEF(1GB_PG, 0x80000001, 0, RTE_REG_EDX, 26)
+ FEAT_DEF(RDTSCP, 0x80000001, 0, RTE_REG_EDX, 27)
+ FEAT_DEF(EM64T, 0x80000001, 0, RTE_REG_EDX, 29)
+
+ FEAT_DEF(INVTSC, 0x80000007, 0, RTE_REG_EDX, 8)
+};
+
+/*
+ * 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 void
+rte_cpu_get_features(uint32_t leaf, uint32_t subleaf, cpuid_registers_t out)
+{
+#if defined(__i386__) && defined(__PIC__)
+ /* %ebx is a forbidden register if we compile with -fPIC or -fPIE */
+ asm volatile("movl %%ebx,%0 ; cpuid ; xchgl %%ebx,%0"
+ : "=r" (out[RTE_REG_EBX]),
+ "=a" (out[RTE_REG_EAX]),
+ "=c" (out[RTE_REG_ECX]),
+ "=d" (out[RTE_REG_EDX])
+ : "a" (leaf), "c" (subleaf));
+#else
+ asm volatile("cpuid"
+ : "=a" (out[RTE_REG_EAX]),
+ "=b" (out[RTE_REG_EBX]),
+ "=c" (out[RTE_REG_ECX]),
+ "=d" (out[RTE_REG_EDX])
+ : "a" (leaf), "c" (subleaf));
+#endif
+}
+
+int
+rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
+{
+ const struct feature_entry *feat;
+ cpuid_registers_t regs;
+
+ if (feature >= RTE_CPUFLAG_NUMFLAGS)
+ /* Flag does not match anything in the feature tables */
+ return -ENOENT;
+
+ feat = &rte_cpu_feature_table[feature];
+
+ if (!feat->leaf)
+ /* This entry in the table wasn't filled out! */
+ return -EFAULT;
+
+ rte_cpu_get_features(feat->leaf & 0xffff0000, 0, regs);
+ if (((regs[RTE_REG_EAX] ^ feat->leaf) & 0xffff0000) ||
+ regs[RTE_REG_EAX] < feat->leaf)
+ return 0;
+
+ /* 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;
+}
+
+const char *
+rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
+{
+ if (feature >= RTE_CPUFLAG_NUMFLAGS)
+ return NULL;
+ return rte_cpu_feature_table[feature].name;
+}
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