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 s390_idle_data *idle = &__get_cpu_var(s390_idle); 27 struct cpuid *id = &__get_cpu_var(cpu_id); 28 29 get_cpu_id(id); 30 atomic_inc(&init_mm.mm_count); 31 current->active_mm = &init_mm; 32 BUG_ON(current->mm); 33 enter_lazy_tlb(&init_mm, current); 34 memset(idle, 0, sizeof(*idle)); 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[] = { 43 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp", 44 "edat", "etf3eh", "highgprs", "te" 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 < ARRAY_SIZE(hwcap_str); i++) 58 if (hwcap_str[i] && (elf_hwcap & (1UL << i))) 59 seq_printf(m, "%s ", hwcap_str[i]); 60 seq_puts(m, "\n"); 61 show_cacheinfo(m); 62 } 63 get_online_cpus(); 64 if (cpu_online(n)) { 65 struct cpuid *id = &per_cpu(cpu_id, n); 66 seq_printf(m, "processor %li: " 67 "version = %02X, " 68 "identification = %06X, " 69 "machine = %04X\n", 70 n, id->version, id->ident, id->machine); 71 } 72 put_online_cpus(); 73 return 0; 74 } 75 76 static void *c_start(struct seq_file *m, loff_t *pos) 77 { 78 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 79 } 80 81 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 82 { 83 ++*pos; 84 return c_start(m, pos); 85 } 86 87 static void c_stop(struct seq_file *m, void *v) 88 { 89 } 90 91 const struct seq_operations cpuinfo_op = { 92 .start = c_start, 93 .next = c_next, 94 .stop = c_stop, 95 .show = show_cpuinfo, 96 }; 97 98