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/*
* 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 != -1);
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;
}
close(auxv_fd);
}
/*
* 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;
}
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