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, stap(), 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 }; 108 109