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 #include <linux/cpu.h> 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 * show_cpuinfo - Get information on one CPU for use by procfs. 39 */ 40 static int show_cpuinfo(struct seq_file *m, void *v) 41 { 42 static const char *hwcap_str[10] = { 43 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 44 "edat", "etf3eh", "highgprs" 45 }; 46 unsigned long n = (unsigned long) v - 1; 47 int i; 48 49 if (!n) { 50 s390_adjust_jiffies(); 51 seq_printf(m, "vendor_id : IBM/S390\n" 52 "# processors : %i\n" 53 "bogomips per cpu: %lu.%02lu\n", 54 num_online_cpus(), loops_per_jiffy/(500000/HZ), 55 (loops_per_jiffy/(5000/HZ))%100); 56 seq_puts(m, "features\t: "); 57 for (i = 0; i < 10; i++) 58 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 59 seq_printf(m, "%s ", hwcap_str[i]); 60 seq_puts(m, "\n"); 61 } 62 get_online_cpus(); 63 if (cpu_online(n)) { 64 struct cpuid *id = &per_cpu(cpu_id, n); 65 seq_printf(m, "processor %li: " 66 "version = %02X, " 67 "identification = %06X, " 68 "machine = %04X\n", 69 n, id->version, id->ident, id->machine); 70 } 71 put_online_cpus(); 72 return 0; 73 } 74 75 static void *c_start(struct seq_file *m, loff_t *pos) 76 { 77 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 78 } 79 80 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 81 { 82 ++*pos; 83 return c_start(m, pos); 84 } 85 86 static void c_stop(struct seq_file *m, void *v) 87 { 88 } 89 90 const struct seq_operations cpuinfo_op = { 91 .start = c_start, 92 .next = c_next, 93 .stop = c_stop, 94 .show = show_cpuinfo, 95 }; 96 97