2 * arch/s390/kernel/processor.c
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
8 #define KMSG_COMPONENT "cpu"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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>
18 #include <asm/lowcore.h>
19 #include <asm/param.h>
21 static DEFINE_PER_CPU(struct cpuid
, cpu_id
);
24 * cpu_init - initializes state that is per-CPU.
26 void __cpuinit
cpu_init(void)
28 struct cpuid
*id
= &per_cpu(cpu_id
, smp_processor_id());
31 atomic_inc(&init_mm
.mm_count
);
32 current
->active_mm
= &init_mm
;
34 enter_lazy_tlb(&init_mm
, current
);
38 * print_cpu_info - print basic information about a cpu
40 void __cpuinit
print_cpu_info(void)
42 struct cpuid
*id
= &per_cpu(cpu_id
, smp_processor_id());
44 pr_info("Processor %d started, address %d, identification %06X\n",
45 S390_lowcore
.cpu_nr
, S390_lowcore
.cpu_addr
, id
->ident
);
49 * show_cpuinfo - Get information on one CPU for use by procfs.
51 static int show_cpuinfo(struct seq_file
*m
, void *v
)
53 static const char *hwcap_str
[10] = {
54 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
55 "edat", "etf3eh", "highgprs"
57 unsigned long n
= (unsigned long) v
- 1;
60 s390_adjust_jiffies();
63 seq_printf(m
, "vendor_id : IBM/S390\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
]);
76 struct cpuid
*id
= &per_cpu(cpu_id
, n
);
77 seq_printf(m
, "processor %li: "
79 "identification = %06X, "
81 n
, id
->version
, id
->ident
, id
->machine
);
87 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
89 return *pos
< NR_CPUS
? (void *)((unsigned long) *pos
+ 1) : NULL
;
92 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
95 return c_start(m
, pos
);
98 static void c_stop(struct seq_file
*m
, void *v
)
102 const struct seq_operations cpuinfo_op
= {
106 .show
= show_cpuinfo
,