Root/arch/s390/kernel/processor.c

1/*
2 * arch/s390/kernel/processor.c
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 */
7
8#define KMSG_COMPONENT "cpu"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/smp.h>
14#include <linux/seq_file.h>
15#include <linux/delay.h>
16
17#include <asm/elf.h>
18#include <asm/lowcore.h>
19#include <asm/param.h>
20
21static DEFINE_PER_CPU(struct cpuid, cpu_id);
22
23/*
24 * cpu_init - initializes state that is per-CPU.
25 */
26void __cpuinit cpu_init(void)
27{
28    struct cpuid *id = &per_cpu(cpu_id, smp_processor_id());
29
30    get_cpu_id(id);
31    atomic_inc(&init_mm.mm_count);
32    current->active_mm = &init_mm;
33    BUG_ON(current->mm);
34    enter_lazy_tlb(&init_mm, current);
35}
36
37/*
38 * print_cpu_info - print basic information about a cpu
39 */
40void __cpuinit print_cpu_info(void)
41{
42    struct cpuid *id = &per_cpu(cpu_id, smp_processor_id());
43
44    pr_info("Processor %d started, address %d, identification %06X\n",
45        S390_lowcore.cpu_nr, stap(), id->ident);
46}
47
48/*
49 * show_cpuinfo - Get information on one CPU for use by procfs.
50 */
51static int show_cpuinfo(struct seq_file *m, void *v)
52{
53    static const char *hwcap_str[10] = {
54        "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
55        "edat", "etf3eh", "highgprs"
56    };
57    unsigned long n = (unsigned long) v - 1;
58    int i;
59
60    s390_adjust_jiffies();
61    preempt_disable();
62    if (!n) {
63        seq_printf(m, "vendor_id : IBM/S390\n"
64               "# processors : %i\n"
65               "bogomips per cpu: %lu.%02lu\n",
66               num_online_cpus(), loops_per_jiffy/(500000/HZ),
67               (loops_per_jiffy/(5000/HZ))%100);
68        seq_puts(m, "features\t: ");
69        for (i = 0; i < 10; i++)
70            if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
71                seq_printf(m, "%s ", hwcap_str[i]);
72        seq_puts(m, "\n");
73    }
74
75    if (cpu_online(n)) {
76        struct cpuid *id = &per_cpu(cpu_id, n);
77        seq_printf(m, "processor %li: "
78               "version = %02X, "
79               "identification = %06X, "
80               "machine = %04X\n",
81               n, id->version, id->ident, id->machine);
82    }
83    preempt_enable();
84    return 0;
85}
86
87static void *c_start(struct seq_file *m, loff_t *pos)
88{
89    return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
90}
91
92static void *c_next(struct seq_file *m, void *v, loff_t *pos)
93{
94    ++*pos;
95    return c_start(m, pos);
96}
97
98static void c_stop(struct seq_file *m, void *v)
99{
100}
101
102const struct seq_operations cpuinfo_op = {
103    .start = c_start,
104    .next = c_next,
105    .stop = c_stop,
106    .show = show_cpuinfo,
107};
108
109

Archive Download this file



interactive