X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Fcommon%2Farch%2Fx86%2Frte_cpuflags.c;h=6492df556c0ecd035968d089dcc7eb4eaea87cd0;hb=ffadd933acdcb17edf5f825e8321b9ac9cd4bb07;hp=22dc57213f848115836bb875f8919ce2a96141bc;hpb=c344eab3eecb71203681e6c5c5b64aefb2d7ad94;p=dpdk.git

diff --git a/lib/librte_eal/common/arch/x86/rte_cpuflags.c b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
index 22dc57213f..6492df556c 100644
--- a/lib/librte_eal/common/arch/x86/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
@@ -1,38 +1,30 @@
-/*-
- *   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.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2015 Intel Corporation
  */
 
 #include "rte_cpuflags.h"
 
+#include <stdio.h>
+#include <errno.h>
+#include <stdint.h>
+
+#include "rte_cpuid.h"
+
+/**
+ * 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)
@@ -63,6 +55,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
 	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(HYPERVISOR, 0x00000001, 0, RTE_REG_ECX, 31)
 
 	FEAT_DEF(FPU, 0x00000001, 0, RTE_REG_EDX,  0)
 	FEAT_DEF(VME, 0x00000001, 0, RTE_REG_EDX,  1)
@@ -115,6 +108,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
 	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(RDSEED, 0x00000007, 0, RTE_REG_EBX, 18)
 
 	FEAT_DEF(LAHF_SAHF, 0x80000001, 0, RTE_REG_ECX,  0)
 	FEAT_DEF(LZCNT, 0x80000001, 0, RTE_REG_ECX,  4)
@@ -127,3 +121,41 @@ const struct feature_entry rte_cpu_feature_table[] = {
 
 	FEAT_DEF(INVTSC, 0x80000007, 0, RTE_REG_EDX,  8)
 };
+
+int
+rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
+{
+	const struct feature_entry *feat;
+	cpuid_registers_t regs;
+	unsigned int maxleaf;
+
+	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;
+
+	maxleaf = __get_cpuid_max(feat->leaf & 0x80000000, NULL);
+
+	if (maxleaf < feat->leaf)
+		return 0;
+
+	 __cpuid_count(feat->leaf, feat->subleaf,
+			 regs[RTE_REG_EAX], regs[RTE_REG_EBX],
+			 regs[RTE_REG_ECX], regs[RTE_REG_EDX]);
+
+	/* 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;
+}