release/src-rt-6.x.4708/linux/linux-2.6.36/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
  21 static DEFINE_PER_CPU(struct cpuid, cpu_id);
  22
  23 /*
  24  * cpu_init - initializes state that is per-CPU.
  25  */
  26 void __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  */
  40 void __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, S390_lowcore.cpu_addr, id->ident);
  46 }
  47
  48 /*
  49  * show_cpuinfo - Get information on one CPU for use by procfs.
  50  */
  51 static 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
  87 static void *c_start(struct seq_file *m, loff_t *pos)
  88 {
  89         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
  90 }
  91
  92 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  93 {
  94         ++*pos;
  95         return c_start(m, pos);
  96 }
  97
  98 static void c_stop(struct seq_file *m, void *v)
  99 {
 100 }
 101
 102 const struct seq_operations cpuinfo_op = {
 103         .start  = c_start,
 104         .next   = c_next,
 105         .stop   = c_stop,
 106         .show   = show_cpuinfo,
 107 };