--- /dev/null
+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium networks Ltd. 2015.
+ * Copyright(c) 2015 RehiveTech. 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 Cavium networks 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 <elf.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+
+#ifndef AT_HWCAP2
+#define AT_HWCAP2 26
+#endif
+
+#ifndef AT_PLATFORM
+#define AT_PLATFORM 15
+#endif
+
+enum cpu_register_t {
+ REG_NONE = 0,
+ REG_HWCAP,
+ REG_HWCAP2,
+ REG_PLATFORM,
+ REG_MAX
+};
+
+typedef uint32_t hwcap_registers_t[REG_MAX];
+
+/**
+ * Struct to hold a processor feature entry
+ */
+struct feature_entry {
+ uint32_t reg;
+ uint32_t bit;
+#define CPU_FLAG_NAME_MAX_LEN 64
+ char name[CPU_FLAG_NAME_MAX_LEN];
+};
+
+#define FEAT_DEF(name, reg, bit) \
+ [RTE_CPUFLAG_##name] = {reg, bit, #name},
+
+#ifdef RTE_ARCH_ARMv7
+#define PLATFORM_STR "v7l"
+typedef Elf32_auxv_t _Elfx_auxv_t;
+
+const struct feature_entry rte_cpu_feature_table[] = {
+ FEAT_DEF(SWP, REG_HWCAP, 0)
+ FEAT_DEF(HALF, REG_HWCAP, 1)
+ FEAT_DEF(THUMB, REG_HWCAP, 2)
+ FEAT_DEF(A26BIT, REG_HWCAP, 3)
+ FEAT_DEF(FAST_MULT, REG_HWCAP, 4)
+ FEAT_DEF(FPA, REG_HWCAP, 5)
+ FEAT_DEF(VFP, REG_HWCAP, 6)
+ FEAT_DEF(EDSP, REG_HWCAP, 7)
+ FEAT_DEF(JAVA, REG_HWCAP, 8)
+ FEAT_DEF(IWMMXT, REG_HWCAP, 9)
+ FEAT_DEF(CRUNCH, REG_HWCAP, 10)
+ FEAT_DEF(THUMBEE, REG_HWCAP, 11)
+ FEAT_DEF(NEON, REG_HWCAP, 12)
+ FEAT_DEF(VFPv3, REG_HWCAP, 13)
+ FEAT_DEF(VFPv3D16, REG_HWCAP, 14)
+ FEAT_DEF(TLS, REG_HWCAP, 15)
+ FEAT_DEF(VFPv4, REG_HWCAP, 16)
+ FEAT_DEF(IDIVA, REG_HWCAP, 17)
+ FEAT_DEF(IDIVT, REG_HWCAP, 18)
+ FEAT_DEF(VFPD32, REG_HWCAP, 19)
+ FEAT_DEF(LPAE, REG_HWCAP, 20)
+ FEAT_DEF(EVTSTRM, REG_HWCAP, 21)
+ FEAT_DEF(AES, REG_HWCAP2, 0)
+ FEAT_DEF(PMULL, REG_HWCAP2, 1)
+ FEAT_DEF(SHA1, REG_HWCAP2, 2)
+ FEAT_DEF(SHA2, REG_HWCAP2, 3)
+ FEAT_DEF(CRC32, REG_HWCAP2, 4)
+ FEAT_DEF(V7L, REG_PLATFORM, 0)
+};
+
+#elif defined RTE_ARCH_ARM64
+#define PLATFORM_STR "aarch64"
+typedef Elf64_auxv_t _Elfx_auxv_t;
+
+const struct feature_entry rte_cpu_feature_table[] = {
+ FEAT_DEF(FP, REG_HWCAP, 0)
+ FEAT_DEF(NEON, REG_HWCAP, 1)
+ FEAT_DEF(EVTSTRM, REG_HWCAP, 2)
+ FEAT_DEF(AES, REG_HWCAP, 3)
+ FEAT_DEF(PMULL, REG_HWCAP, 4)
+ FEAT_DEF(SHA1, REG_HWCAP, 5)
+ FEAT_DEF(SHA2, REG_HWCAP, 6)
+ FEAT_DEF(CRC32, REG_HWCAP, 7)
+ FEAT_DEF(ATOMICS, REG_HWCAP, 8)
+ FEAT_DEF(AARCH64, REG_PLATFORM, 1)
+};
+#endif /* RTE_ARCH */
+
+/*
+ * Read AUXV software register and get cpu features for ARM
+ */
+static void
+rte_cpu_get_features(hwcap_registers_t out)
+{
+ int auxv_fd;
+ _Elfx_auxv_t auxv;
+
+ auxv_fd = open("/proc/self/auxv", O_RDONLY);
+ assert(auxv_fd);
+ while (read(auxv_fd, &auxv, sizeof(auxv)) == sizeof(auxv)) {
+ if (auxv.a_type == AT_HWCAP) {
+ out[REG_HWCAP] = auxv.a_un.a_val;
+ } else if (auxv.a_type == AT_HWCAP2) {
+ out[REG_HWCAP2] = auxv.a_un.a_val;
+ } else if (auxv.a_type == AT_PLATFORM) {
+ if (!strcmp((const char *)auxv.a_un.a_val, PLATFORM_STR))
+ out[REG_PLATFORM] = 0x0001;
+ }
+ }
+}
+
+/*
+ * Checks if a particular flag is available on current machine.
+ */
+int
+rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
+{
+ const struct feature_entry *feat;
+ hwcap_registers_t regs = {0};
+
+ if (feature >= RTE_CPUFLAG_NUMFLAGS)
+ return -ENOENT;
+
+ feat = &rte_cpu_feature_table[feature];
+ if (feat->reg == REG_NONE)
+ return -EFAULT;
+
+ rte_cpu_get_features(regs);
+ 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;
+}
Code Review / deb_dpdk.git / blobdiff