eal/x86: get hypervisor name

[dpdk.git] / lib / librte_eal / common / arch / x86 / rte_cpuflags.c

diff --git a/lib/librte_eal/common/arch/x86/rte_cpuflags.c b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
index 3346fde..053612d 100644 (file)
--- 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)
@@ -128,6 +121,36 @@ 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)
 {