2 * Copyright IBM Corp. 2008
3 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 #define KMSG_COMPONENT "cpu"
7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/seq_file.h>
12 #include <linux/delay.h>
13 #include <linux/cpu.h>
15 #include <asm/lowcore.h>
16 #include <asm/param.h>
19 static DEFINE_PER_CPU(struct cpuid, cpu_id);
23 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
24 asm volatile("diag 0,0,0x44");
27 EXPORT_SYMBOL(cpu_relax);
30 * cpu_init - initializes state that is per-CPU.
34 struct cpuid *id = this_cpu_ptr(&cpu_id);
37 atomic_inc(&init_mm.mm_count);
38 current->active_mm = &init_mm;
40 enter_lazy_tlb(&init_mm, current);
44 * show_cpuinfo - Get information on one CPU for use by procfs.
46 static int show_cpuinfo(struct seq_file *m, void *v)
48 static const char *hwcap_str[] = {
49 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
50 "edat", "etf3eh", "highgprs", "te", "vx"
52 unsigned long n = (unsigned long) v - 1;
56 s390_adjust_jiffies();
57 seq_printf(m, "vendor_id : IBM/S390\n"
59 "bogomips per cpu: %lu.%02lu\n",
60 num_online_cpus(), loops_per_jiffy/(500000/HZ),
61 (loops_per_jiffy/(5000/HZ))%100);
62 seq_puts(m, "features\t: ");
63 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
64 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
65 seq_printf(m, "%s ", hwcap_str[i]);
71 struct cpuid *id = &per_cpu(cpu_id, n);
72 seq_printf(m, "processor %li: "
74 "identification = %06X, "
76 n, id->version, id->ident, id->machine);
82 static void *c_start(struct seq_file *m, loff_t *pos)
84 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
87 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
90 return c_start(m, pos);
93 static void c_stop(struct seq_file *m, void *v)
97 const struct seq_operations cpuinfo_op = {
101 .show = show_cpuinfo,