Imported Upstream version 16.04

[deb_dpdk.git] / lib / librte_eal / common / arch / ppc_64 / rte_cpuflags.c

diff --git a/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c b/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c
new file mode 100644 (file)
index 0000000..a8147c8
--- /dev/null
+++ b/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c
@@ -0,0 +1,147 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright (C) IBM Corporation 2014.
+ *
+ *   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 IBM 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 <elf.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+
+/* Symbolic values for the entries in the auxiliary table */
+#define AT_HWCAP  16
+#define AT_HWCAP2 26
+
+/* software based registers */
+enum cpu_register_t {
+       REG_NONE = 0,
+       REG_HWCAP,
+       REG_HWCAP2,
+       REG_MAX
+};
+
+typedef uint32_t hwcap_registers_t[REG_MAX];
+
+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},
+
+const struct feature_entry rte_cpu_feature_table[] = {
+       FEAT_DEF(PPC_LE,                 REG_HWCAP,   0)
+       FEAT_DEF(TRUE_LE,                REG_HWCAP,   1)
+       FEAT_DEF(PSERIES_PERFMON_COMPAT, REG_HWCAP,   6)
+       FEAT_DEF(VSX,                    REG_HWCAP,   7)
+       FEAT_DEF(ARCH_2_06,              REG_HWCAP,   8)
+       FEAT_DEF(POWER6_EXT,             REG_HWCAP,   9)
+       FEAT_DEF(DFP,                    REG_HWCAP,  10)
+       FEAT_DEF(PA6T,                   REG_HWCAP,  11)
+       FEAT_DEF(ARCH_2_05,              REG_HWCAP,  12)
+       FEAT_DEF(ICACHE_SNOOP,           REG_HWCAP,  13)
+       FEAT_DEF(SMT,                    REG_HWCAP,  14)
+       FEAT_DEF(BOOKE,                  REG_HWCAP,  15)
+       FEAT_DEF(CELLBE,                 REG_HWCAP,  16)
+       FEAT_DEF(POWER5_PLUS,            REG_HWCAP,  17)
+       FEAT_DEF(POWER5,                 REG_HWCAP,  18)
+       FEAT_DEF(POWER4,                 REG_HWCAP,  19)
+       FEAT_DEF(NOTB,                   REG_HWCAP,  20)
+       FEAT_DEF(EFP_DOUBLE,             REG_HWCAP,  21)
+       FEAT_DEF(EFP_SINGLE,             REG_HWCAP,  22)
+       FEAT_DEF(SPE,                    REG_HWCAP,  23)
+       FEAT_DEF(UNIFIED_CACHE,          REG_HWCAP,  24)
+       FEAT_DEF(4xxMAC,                 REG_HWCAP,  25)
+       FEAT_DEF(MMU,                    REG_HWCAP,  26)
+       FEAT_DEF(FPU,                    REG_HWCAP,  27)
+       FEAT_DEF(ALTIVEC,                REG_HWCAP,  28)
+       FEAT_DEF(PPC601,                 REG_HWCAP,  29)
+       FEAT_DEF(PPC64,                  REG_HWCAP,  30)
+       FEAT_DEF(PPC32,                  REG_HWCAP,  31)
+       FEAT_DEF(TAR,                    REG_HWCAP2, 26)
+       FEAT_DEF(LSEL,                   REG_HWCAP2, 27)
+       FEAT_DEF(EBB,                    REG_HWCAP2, 28)
+       FEAT_DEF(DSCR,                   REG_HWCAP2, 29)
+       FEAT_DEF(HTM,                    REG_HWCAP2, 30)
+       FEAT_DEF(ARCH_2_07,              REG_HWCAP2, 31)
+};
+
+/*
+ * Read AUXV software register and get cpu features for Power
+ */
+static void
+rte_cpu_get_features(hwcap_registers_t out)
+{
+       int auxv_fd;
+       Elf64_auxv_t auxv;
+
+       auxv_fd = open("/proc/self/auxv", O_RDONLY);
+       assert(auxv_fd);
+       while (read(auxv_fd, &auxv,
+               sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t)) {
+               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;
+       }
+}
+
+/*
+ * 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;
+}