1 /* 2 * Copyright IBM Corp. 2008 3 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) 4 */ 5 6 #define KMSG_COMPONENT "cpu" 7 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/smp.h> 12 #include <linux/seq_file.h> 13 #include <linux/delay.h> 14 #include <linux/cpu.h> 15 #include <asm/elf.h> 16 #include <asm/lowcore.h> 17 #include <asm/param.h> 18 19 static DEFINE_PER_CPU(struct cpuid, cpu_id); 20 21 /* 22 * cpu_init - initializes state that is per-CPU. 23 */ 24 void cpu_init(void) 25 { 26 struct cpuid *id = this_cpu_ptr(&cpu_id); 27 28 get_cpu_id(id); 29 atomic_inc(&init_mm.mm_count); 30 current->active_mm = &init_mm; 31 BUG_ON(current->mm); 32 enter_lazy_tlb(&init_mm, current); 33 } 34 35 /* 36 * show_cpuinfo - Get information on one CPU for use by procfs. 37 */ 38 static int show_cpuinfo(struct seq_file *m, void *v) 39 { 40 static const char *hwcap_str[] = { 41 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 42 "edat", "etf3eh", "highgprs", "te", "vx" 43 }; 44 unsigned long n = (unsigned long) v - 1; 45 int i; 46 47 if (!n) { 48 s390_adjust_jiffies(); 49 seq_printf(m, "vendor_id : IBM/S390\n" 50 "# processors : %i\n" 51 "bogomips per cpu: %lu.%02lu\n", 52 num_online_cpus(), loops_per_jiffy/(500000/HZ), 53 (loops_per_jiffy/(5000/HZ))%100); 54 seq_puts(m, "features\t: "); 55 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++) 56 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 57 seq_printf(m, "%s ", hwcap_str[i]); 58 seq_puts(m, "\n"); 59 show_cacheinfo(m); 60 } 61 get_online_cpus(); 62 if (cpu_online(n)) { 63 struct cpuid *id = &per_cpu(cpu_id, n); 64 seq_printf(m, "processor %li: " 65 "version = %02X, " 66 "identification = %06X, " 67 "machine = %04X\n", 68 n, id->version, id->ident, id->machine); 69 } 70 put_online_cpus(); 71 return 0; 72 } 73 74 static void *c_start(struct seq_file *m, loff_t *pos) 75 { 76 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 77 } 78 79 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 80 { 81 ++*pos; 82 return c_start(m, pos); 83 } 84 85 static void c_stop(struct seq_file *m, void *v) 86 { 87 } 88 89 const struct seq_operations cpuinfo_op = { 90 .start = c_start, 91 .next = c_next, 92 .stop = c_stop, 93 .show = show_cpuinfo, 94 }; 95 96