mirror of https://github.com/F-Stack/f-stack.git
124 lines
1.8 KiB
C
124 lines
1.8 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2017 Intel Corporation
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*/
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#include <fcntl.h>
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#include <unistd.h>
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#include <cpuid.h>
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#include <rte_common.h>
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#include "eal_private.h"
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static unsigned int
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rte_cpu_get_model(uint32_t fam_mod_step)
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{
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uint32_t family, model, ext_model;
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family = (fam_mod_step >> 8) & 0xf;
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model = (fam_mod_step >> 4) & 0xf;
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if (family == 6 || family == 15) {
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ext_model = (fam_mod_step >> 16) & 0xf;
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model += (ext_model << 4);
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}
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return model;
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}
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static int32_t
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rdmsr(int msr, uint64_t *val)
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{
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#ifdef RTE_EXEC_ENV_LINUX
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int fd;
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int ret;
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fd = open("/dev/cpu/0/msr", O_RDONLY);
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if (fd < 0)
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return fd;
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ret = pread(fd, val, sizeof(uint64_t), msr);
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close(fd);
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return ret;
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#else
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RTE_SET_USED(msr);
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RTE_SET_USED(val);
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return -1;
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#endif
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}
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static uint32_t
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check_model_wsm_nhm(uint8_t model)
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{
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switch (model) {
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/* Westmere */
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case 0x25:
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case 0x2C:
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case 0x2F:
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/* Nehalem */
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case 0x1E:
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case 0x1F:
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case 0x1A:
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case 0x2E:
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return 1;
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}
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return 0;
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}
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static uint32_t
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check_model_gdm_dnv(uint8_t model)
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{
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switch (model) {
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/* Goldmont */
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case 0x5C:
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/* Denverton */
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case 0x5F:
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return 1;
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}
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return 0;
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}
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uint64_t
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get_tsc_freq_arch(void)
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{
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uint64_t tsc_hz = 0;
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uint32_t a, b, c, d, maxleaf;
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uint8_t mult, model;
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int32_t ret;
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/*
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* Time Stamp Counter and Nominal Core Crystal Clock
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* Information Leaf
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*/
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maxleaf = __get_cpuid_max(0, NULL);
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if (maxleaf >= 0x15) {
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__cpuid(0x15, a, b, c, d);
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/* EBX : TSC/Crystal ratio, ECX : Crystal Hz */
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if (b && c)
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return c * (b / a);
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}
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__cpuid(0x1, a, b, c, d);
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model = rte_cpu_get_model(a);
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if (check_model_wsm_nhm(model))
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mult = 133;
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else if ((c & bit_AVX) || check_model_gdm_dnv(model))
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mult = 100;
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else
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return 0;
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ret = rdmsr(0xCE, &tsc_hz);
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if (ret < 0)
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return 0;
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return ((tsc_hz >> 8) & 0xff) * mult * 1E6;
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}
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