proc.c

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#include <linux/smp.h>
#include <linux/timex.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpufreq.h>

/*
 *  Get CPU information for use by the procfs.
 */
static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
                  unsigned int cpu)
{
#ifdef CONFIG_SMP
    if (c->x86_max_cores * smp_num_siblings > 1) {
        seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
        seq_printf(m, "siblings\t: %d\n",
               cpumask_weight(cpu_core_mask(cpu)));
        seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
        seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
        seq_printf(m, "apicid\t\t: %d\n", c->apicid);
        seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
    }
#endif
}

#ifdef CONFIG_X86_32
static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
{
    /*
     * We use exception 16 if we have hardware math and we've either seen
     * it or the CPU claims it is internal
     */
    int fpu_exception = c->hard_math && (ignore_fpu_irq || cpu_has_fpu);
    seq_printf(m,
           "fdiv_bug\t: %s\n"
           "hlt_bug\t\t: %s\n"
           "f00f_bug\t: %s\n"
           "coma_bug\t: %s\n"
           "fpu\t\t: %s\n"
           "fpu_exception\t: %s\n"
           "cpuid level\t: %d\n"
           "wp\t\t: %s\n",
           c->fdiv_bug ? "yes" : "no",
           c->hlt_works_ok ? "no" : "yes",
           c->f00f_bug ? "yes" : "no",
           c->coma_bug ? "yes" : "no",
           c->hard_math ? "yes" : "no",
           fpu_exception ? "yes" : "no",
           c->cpuid_level,
           c->wp_works_ok ? "yes" : "no");
}
#else
static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
{
    seq_printf(m,
           "fpu\t\t: yes\n"
           "fpu_exception\t: yes\n"
           "cpuid level\t: %d\n"
           "wp\t\t: yes\n",
           c->cpuid_level);
}
#endif

static int show_cpuinfo(struct seq_file *m, void *v)
{
    struct cpuinfo_x86 *c = v;
    unsigned int cpu;
    int i;

    cpu = c->cpu_index;
    seq_printf(m, "processor\t: %u\n"
           "vendor_id\t: %s\n"
           "cpu family\t: %d\n"
           "model\t\t: %u\n"
           "model name\t: %s\n",
           cpu,
           c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
           c->x86,
           c->x86_model,
           c->x86_model_id[0] ? c->x86_model_id : "unknown");

    if (c->x86_mask || c->cpuid_level >= 0)
        seq_printf(m, "stepping\t: %d\n", c->x86_mask);
    else
        seq_printf(m, "stepping\t: unknown\n");
    if (c->microcode)
        seq_printf(m, "microcode\t: 0x%x\n", c->microcode);

    if (cpu_has(c, X86_FEATURE_TSC)) {
        unsigned int freq = cpufreq_quick_get(cpu);

        if (!freq)
            freq = cpu_khz;
        seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
               freq / 1000, (freq % 1000));
    }

    /* Cache size */
    if (c->x86_cache_size >= 0)
        seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);

    show_cpuinfo_core(m, c, cpu);
    show_cpuinfo_misc(m, c);

    seq_printf(m, "flags\t\t:");
    for (i = 0; i < 32*NCAPINTS; i++)
        if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
            seq_printf(m, " %s", x86_cap_flags[i]);

    seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
           c->loops_per_jiffy/(500000/HZ),
           (c->loops_per_jiffy/(5000/HZ)) % 100);

#ifdef CONFIG_X86_64
    if (c->x86_tlbsize > 0)
        seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
#endif
    seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
    seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
    seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
           c->x86_phys_bits, c->x86_virt_bits);

    seq_printf(m, "power management:");
    for (i = 0; i < 32; i++) {
        if (c->x86_power & (1 << i)) {
            if (i < ARRAY_SIZE(x86_power_flags) &&
                x86_power_flags[i])
                seq_printf(m, "%s%s",
                       x86_power_flags[i][0] ? " " : "",
                       x86_power_flags[i]);
            else
                seq_printf(m, " [%d]", i);
        }
    }

    seq_printf(m, "\n\n");

    return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
    *pos = cpumask_next(*pos - 1, cpu_online_mask);
    if ((*pos) < nr_cpu_ids)
        return &cpu_data(*pos);
    return NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
    (*pos)++;
    return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
    .start  = c_start,
    .next   = c_next,
    .stop   = c_stop,
    .show   = show_cpuinfo,
};