[API-NEXT,v3,03/11] linux-gen: cpu_flags: added x86 cpu flag read functions

Message ID 20170428120958.17526-4-petri.savolainen@linaro.org
State New
Headers show
Series
  • Use HW time counter
Related show

Commit Message

Petri Savolainen April 28, 2017, 12:09 p.m.
When building on x86 CPU flags can be used to determine which
CPU features are supported. CPU flag definitions and the code
to read the flags is from DPDK.

Signed-off-by: Petri Savolainen <petri.savolainen@linaro.org>

---
 configure.ac                                |   1 +
 platform/Makefile.inc                       |   4 +-
 platform/linux-generic/Makefile.am          |   4 +
 platform/linux-generic/arch/x86/cpu_flags.c | 359 ++++++++++++++++++++++++++++
 platform/linux-generic/arch/x86/cpu_flags.h |  20 ++
 5 files changed, 387 insertions(+), 1 deletion(-)
 create mode 100644 platform/linux-generic/arch/x86/cpu_flags.c
 create mode 100644 platform/linux-generic/arch/x86/cpu_flags.h

-- 
2.11.0

Patch hide | download patch | download mbox

diff --git a/configure.ac b/configure.ac
index e86e2dca..38129030 100644
--- a/configure.ac
+++ b/configure.ac
@@ -224,6 +224,7 @@  AM_CONDITIONAL([HAVE_DOXYGEN], [test "x${DOXYGEN}" = "xdoxygen"])
 AM_CONDITIONAL([user_guide], [test "x${user_guides}" = "xyes" ])
 AM_CONDITIONAL([HAVE_MSCGEN], [test "x${MSCGEN}" = "xmscgen"])
 AM_CONDITIONAL([helper_linux], [test x$helper_linux = xyes ])
+AM_CONDITIONAL([ARCH_IS_X86], [test "x${ARCH_DIR}" = "xx86"])
 
 ##########################################################################
 # Setup doxygen documentation
diff --git a/platform/Makefile.inc b/platform/Makefile.inc
index b4cc2433..c5b17b57 100644
--- a/platform/Makefile.inc
+++ b/platform/Makefile.inc
@@ -112,4 +112,6 @@  EXTRA_DIST = \
 	     arch/powerpc/odp_sysinfo_parse.c \
 	     arch/x86/odp/api/cpu_arch.h \
 	     arch/x86/odp_cpu_arch.c \
-	     arch/x86/odp_sysinfo_parse.c
+	     arch/x86/odp_sysinfo_parse.c \
+	     arch/x86/cpu_flags.c \
+	     arch/x86/cpu_flags.h
diff --git a/platform/linux-generic/Makefile.am b/platform/linux-generic/Makefile.am
index 58c8ea1b..ab74c14c 100644
--- a/platform/linux-generic/Makefile.am
+++ b/platform/linux-generic/Makefile.am
@@ -253,6 +253,10 @@  __LIB__libodp_linux_la_SOURCES = \
 			   arch/@ARCH_DIR@/odp_cpu_arch.c \
 			   arch/@ARCH_DIR@/odp_sysinfo_parse.c
 
+if ARCH_IS_X86
+__LIB__libodp_linux_la_SOURCES += arch/@ARCH_DIR@/cpu_flags.c
+endif
+
 if HAVE_PCAP
 __LIB__libodp_linux_la_SOURCES += pktio/pcap.c
 endif
diff --git a/platform/linux-generic/arch/x86/cpu_flags.c b/platform/linux-generic/arch/x86/cpu_flags.c
new file mode 100644
index 00000000..954dac27
--- /dev/null
+++ b/platform/linux-generic/arch/x86/cpu_flags.c
@@ -0,0 +1,359 @@ 
+/* Copyright (c) 2017, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+/*-
+ *   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 <arch/x86/cpu_flags.h>
+#include <odp_debug_internal.h>
+#include <stdio.h>
+#include <stdint.h>
+
+enum rte_cpu_flag_t {
+	/* (EAX 01h) ECX features*/
+	RTE_CPUFLAG_SSE3 = 0,               /**< SSE3 */
+	RTE_CPUFLAG_PCLMULQDQ,              /**< PCLMULQDQ */
+	RTE_CPUFLAG_DTES64,                 /**< DTES64 */
+	RTE_CPUFLAG_MONITOR,                /**< MONITOR */
+	RTE_CPUFLAG_DS_CPL,                 /**< DS_CPL */
+	RTE_CPUFLAG_VMX,                    /**< VMX */
+	RTE_CPUFLAG_SMX,                    /**< SMX */
+	RTE_CPUFLAG_EIST,                   /**< EIST */
+	RTE_CPUFLAG_TM2,                    /**< TM2 */
+	RTE_CPUFLAG_SSSE3,                  /**< SSSE3 */
+	RTE_CPUFLAG_CNXT_ID,                /**< CNXT_ID */
+	RTE_CPUFLAG_FMA,                    /**< FMA */
+	RTE_CPUFLAG_CMPXCHG16B,             /**< CMPXCHG16B */
+	RTE_CPUFLAG_XTPR,                   /**< XTPR */
+	RTE_CPUFLAG_PDCM,                   /**< PDCM */
+	RTE_CPUFLAG_PCID,                   /**< PCID */
+	RTE_CPUFLAG_DCA,                    /**< DCA */
+	RTE_CPUFLAG_SSE4_1,                 /**< SSE4_1 */
+	RTE_CPUFLAG_SSE4_2,                 /**< SSE4_2 */
+	RTE_CPUFLAG_X2APIC,                 /**< X2APIC */
+	RTE_CPUFLAG_MOVBE,                  /**< MOVBE */
+	RTE_CPUFLAG_POPCNT,                 /**< POPCNT */
+	RTE_CPUFLAG_TSC_DEADLINE,           /**< TSC_DEADLINE */
+	RTE_CPUFLAG_AES,                    /**< AES */
+	RTE_CPUFLAG_XSAVE,                  /**< XSAVE */
+	RTE_CPUFLAG_OSXSAVE,                /**< OSXSAVE */
+	RTE_CPUFLAG_AVX,                    /**< AVX */
+	RTE_CPUFLAG_F16C,                   /**< F16C */
+	RTE_CPUFLAG_RDRAND,                 /**< RDRAND */
+
+	/* (EAX 01h) EDX features */
+	RTE_CPUFLAG_FPU,                    /**< FPU */
+	RTE_CPUFLAG_VME,                    /**< VME */
+	RTE_CPUFLAG_DE,                     /**< DE */
+	RTE_CPUFLAG_PSE,                    /**< PSE */
+	RTE_CPUFLAG_TSC,                    /**< TSC */
+	RTE_CPUFLAG_MSR,                    /**< MSR */
+	RTE_CPUFLAG_PAE,                    /**< PAE */
+	RTE_CPUFLAG_MCE,                    /**< MCE */
+	RTE_CPUFLAG_CX8,                    /**< CX8 */
+	RTE_CPUFLAG_APIC,                   /**< APIC */
+	RTE_CPUFLAG_SEP,                    /**< SEP */
+	RTE_CPUFLAG_MTRR,                   /**< MTRR */
+	RTE_CPUFLAG_PGE,                    /**< PGE */
+	RTE_CPUFLAG_MCA,                    /**< MCA */
+	RTE_CPUFLAG_CMOV,                   /**< CMOV */
+	RTE_CPUFLAG_PAT,                    /**< PAT */
+	RTE_CPUFLAG_PSE36,                  /**< PSE36 */
+	RTE_CPUFLAG_PSN,                    /**< PSN */
+	RTE_CPUFLAG_CLFSH,                  /**< CLFSH */
+	RTE_CPUFLAG_DS,                     /**< DS */
+	RTE_CPUFLAG_ACPI,                   /**< ACPI */
+	RTE_CPUFLAG_MMX,                    /**< MMX */
+	RTE_CPUFLAG_FXSR,                   /**< FXSR */
+	RTE_CPUFLAG_SSE,                    /**< SSE */
+	RTE_CPUFLAG_SSE2,                   /**< SSE2 */
+	RTE_CPUFLAG_SS,                     /**< SS */
+	RTE_CPUFLAG_HTT,                    /**< HTT */
+	RTE_CPUFLAG_TM,                     /**< TM */
+	RTE_CPUFLAG_PBE,                    /**< PBE */
+
+	/* (EAX 06h) EAX features */
+	RTE_CPUFLAG_DIGTEMP,                /**< DIGTEMP */
+	RTE_CPUFLAG_TRBOBST,                /**< TRBOBST */
+	RTE_CPUFLAG_ARAT,                   /**< ARAT */
+	RTE_CPUFLAG_PLN,                    /**< PLN */
+	RTE_CPUFLAG_ECMD,                   /**< ECMD */
+	RTE_CPUFLAG_PTM,                    /**< PTM */
+
+	/* (EAX 06h) ECX features */
+	RTE_CPUFLAG_MPERF_APERF_MSR,        /**< MPERF_APERF_MSR */
+	RTE_CPUFLAG_ACNT2,                  /**< ACNT2 */
+	RTE_CPUFLAG_ENERGY_EFF,             /**< ENERGY_EFF */
+
+	/* (EAX 07h, ECX 0h) EBX features */
+	RTE_CPUFLAG_FSGSBASE,               /**< FSGSBASE */
+	RTE_CPUFLAG_BMI1,                   /**< BMI1 */
+	RTE_CPUFLAG_HLE,                    /**< Hardware Lock elision */
+	RTE_CPUFLAG_AVX2,                   /**< AVX2 */
+	RTE_CPUFLAG_SMEP,                   /**< SMEP */
+	RTE_CPUFLAG_BMI2,                   /**< BMI2 */
+	RTE_CPUFLAG_ERMS,                   /**< ERMS */
+	RTE_CPUFLAG_INVPCID,                /**< INVPCID */
+	RTE_CPUFLAG_RTM,                    /**< Transactional memory */
+	RTE_CPUFLAG_AVX512F,                /**< AVX512F */
+
+	/* (EAX 80000001h) ECX features */
+	RTE_CPUFLAG_LAHF_SAHF,              /**< LAHF_SAHF */
+	RTE_CPUFLAG_LZCNT,                  /**< LZCNT */
+
+	/* (EAX 80000001h) EDX features */
+	RTE_CPUFLAG_SYSCALL,                /**< SYSCALL */
+	RTE_CPUFLAG_XD,                     /**< XD */
+	RTE_CPUFLAG_1GB_PG,                 /**< 1GB_PG */
+	RTE_CPUFLAG_RDTSCP,                 /**< RDTSCP */
+	RTE_CPUFLAG_EM64T,                  /**< EM64T */
+
+	/* (EAX 80000007h) EDX features */
+	RTE_CPUFLAG_INVTSC,                 /**< INVTSC */
+
+	/* The last item */
+	RTE_CPUFLAG_NUMFLAGS, /**< This should always be the last! */
+};
+
+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 },
+
+static const struct feature_entry 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 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
+}
+
+static int 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 -1;
+
+	feat = &cpu_feature_table[feature];
+
+	if (!feat->leaf)
+		/* This entry in the table wasn't filled out! */
+		return -1;
+
+	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 */
+	cpu_get_features(feat->leaf, feat->subleaf, regs);
+
+	/* check if the feature is enabled */
+	return (regs[feat->reg] >> feat->bit) & 1;
+}
+
+static const char *cpu_get_flag_name(enum rte_cpu_flag_t feature)
+{
+	if (feature >= RTE_CPUFLAG_NUMFLAGS)
+		return NULL;
+	return cpu_feature_table[feature].name;
+}
+
+void cpu_flags_print_all(void)
+{
+	int len, i;
+	int max_str = 1024;
+	int max_len = max_str - 1;
+	char str[max_str];
+
+	len = snprintf(str, max_len, "\nCPU features supported:\n");
+
+	for (i = 0; i < RTE_CPUFLAG_NUMFLAGS; i++) {
+		if (cpu_get_flag_enabled(i) > 0)
+			len += snprintf(&str[len], max_len - len, "%s ",
+					cpu_get_flag_name(i));
+	}
+
+	len += snprintf(&str[len], max_len - len,
+			"\n\nCPU features NOT supported:\n");
+
+	for (i = 0; i < RTE_CPUFLAG_NUMFLAGS; i++) {
+		if (cpu_get_flag_enabled(i) <= 0)
+			len += snprintf(&str[len], max_len - len, "%s ",
+					cpu_get_flag_name(i));
+	}
+
+	len += snprintf(&str[len], max_len - len, "\n\n");
+
+	str[len] = '\0';
+	ODP_PRINT("%s", str);
+}
diff --git a/platform/linux-generic/arch/x86/cpu_flags.h b/platform/linux-generic/arch/x86/cpu_flags.h
new file mode 100644
index 00000000..f709ca08
--- /dev/null
+++ b/platform/linux-generic/arch/x86/cpu_flags.h
@@ -0,0 +1,20 @@ 
+/* Copyright (c) 2017, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#ifndef ODP_PLAT_CPU_FLAGS_H_
+#define ODP_PLAT_CPU_FLAGS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void cpu_flags_print_all(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif