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);
21 void notrace cpu_relax(void)
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 * cpu_have_feature - Test CPU features on module initialization
46 int cpu_have_feature(unsigned int num)
48 return elf_hwcap & (1UL << num);
50 EXPORT_SYMBOL(cpu_have_feature);
53 * show_cpuinfo - Get information on one CPU for use by procfs.
55 static int show_cpuinfo(struct seq_file *m, void *v)
57 static const char *hwcap_str[] = {
58 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
59 "edat", "etf3eh", "highgprs", "te", "vx"
61 unsigned long n = (unsigned long) v - 1;
65 s390_adjust_jiffies();
66 seq_printf(m, "vendor_id : IBM/S390\n"
68 "bogomips per cpu: %lu.%02lu\n",
69 num_online_cpus(), loops_per_jiffy/(500000/HZ),
70 (loops_per_jiffy/(5000/HZ))%100);
71 seq_puts(m, "features\t: ");
72 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
73 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
74 seq_printf(m, "%s ", hwcap_str[i]);
80 struct cpuid *id = &per_cpu(cpu_id, n);
81 seq_printf(m, "processor %li: "
83 "identification = %06X, "
85 n, id->version, id->ident, id->machine);
91 static void *c_start(struct seq_file *m, loff_t *pos)
93 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
96 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
99 return c_start(m, pos);
102 static void c_stop(struct seq_file *m, void *v)
106 const struct seq_operations cpuinfo_op = {
110 .show = show_cpuinfo,