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>
16 #include <asm/lowcore.h>
17 #include <asm/param.h>
20 static DEFINE_PER_CPU(struct cpuid, cpu_id);
22 void notrace cpu_relax(void)
24 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
25 diag_stat_inc(DIAG_STAT_X044);
26 asm volatile("diag 0,0,0x44");
30 EXPORT_SYMBOL(cpu_relax);
33 * cpu_init - initializes state that is per-CPU.
37 struct cpuid *id = this_cpu_ptr(&cpu_id);
40 atomic_inc(&init_mm.mm_count);
41 current->active_mm = &init_mm;
43 enter_lazy_tlb(&init_mm, current);
47 * cpu_have_feature - Test CPU features on module initialization
49 int cpu_have_feature(unsigned int num)
51 return elf_hwcap & (1UL << num);
53 EXPORT_SYMBOL(cpu_have_feature);
56 * show_cpuinfo - Get information on one CPU for use by procfs.
58 static int show_cpuinfo(struct seq_file *m, void *v)
60 static const char *hwcap_str[] = {
61 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
62 "edat", "etf3eh", "highgprs", "te", "vx"
64 unsigned long n = (unsigned long) v - 1;
68 s390_adjust_jiffies();
69 seq_printf(m, "vendor_id : IBM/S390\n"
71 "bogomips per cpu: %lu.%02lu\n",
72 num_online_cpus(), loops_per_jiffy/(500000/HZ),
73 (loops_per_jiffy/(5000/HZ))%100);
74 seq_puts(m, "features\t: ");
75 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
76 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
77 seq_printf(m, "%s ", hwcap_str[i]);
83 struct cpuid *id = &per_cpu(cpu_id, n);
84 seq_printf(m, "processor %li: "
86 "identification = %06X, "
88 n, id->version, id->ident, id->machine);
94 static void *c_start(struct seq_file *m, loff_t *pos)
96 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
99 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
102 return c_start(m, pos);
105 static void c_stop(struct seq_file *m, void *v)
109 const struct seq_operations cpuinfo_op = {
113 .show = show_cpuinfo,