[PATCH] s390: diag 0x308 reipl
[linux-2.6.git] / arch / s390 / kernel / setup.c
1 /*
2  *  arch/s390/kernel/setup.c
3  *
4  *  S390 version
5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6  *    Author(s): Hartmut Penner (hp@de.ibm.com),
7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
8  *
9  *  Derived from "arch/i386/kernel/setup.c"
10  *    Copyright (C) 1995, Linus Torvalds
11  */
12
13 /*
14  * This file handles the architecture-dependent parts of initialization
15  */
16
17 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
31 #include <linux/config.h>
32 #include <linux/init.h>
33 #include <linux/initrd.h>
34 #include <linux/bootmem.h>
35 #include <linux/root_dev.h>
36 #include <linux/console.h>
37 #include <linux/seq_file.h>
38 #include <linux/kernel_stat.h>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/smp.h>
43 #include <asm/mmu_context.h>
44 #include <asm/cpcmd.h>
45 #include <asm/lowcore.h>
46 #include <asm/irq.h>
47 #include <asm/page.h>
48 #include <asm/ptrace.h>
49
50 /*
51  * Machine setup..
52  */
53 unsigned int console_mode = 0;
54 unsigned int console_devno = -1;
55 unsigned int console_irq = -1;
56 unsigned long memory_size = 0;
57 unsigned long machine_flags = 0;
58 struct {
59         unsigned long addr, size, type;
60 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
61 #define CHUNK_READ_WRITE 0
62 #define CHUNK_READ_ONLY 1
63 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
64 unsigned long __initdata zholes_size[MAX_NR_ZONES];
65 static unsigned long __initdata memory_end;
66
67 /*
68  * Setup options
69  */
70 extern int _text,_etext, _edata, _end;
71
72 /*
73  * This is set up by the setup-routine at boot-time
74  * for S390 need to find out, what we have to setup
75  * using address 0x10400 ...
76  */
77
78 #include <asm/setup.h>
79
80 static char command_line[COMMAND_LINE_SIZE] = { 0, };
81
82 static struct resource code_resource = {
83         .name  = "Kernel code",
84         .start = (unsigned long) &_text,
85         .end = (unsigned long) &_etext - 1,
86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
87 };
88
89 static struct resource data_resource = {
90         .name = "Kernel data",
91         .start = (unsigned long) &_etext,
92         .end = (unsigned long) &_edata - 1,
93         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
94 };
95
96 /*
97  * cpu_init() initializes state that is per-CPU.
98  */
99 void __devinit cpu_init (void)
100 {
101         int addr = hard_smp_processor_id();
102
103         /*
104          * Store processor id in lowcore (used e.g. in timer_interrupt)
105          */
106         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
107         S390_lowcore.cpu_data.cpu_addr = addr;
108
109         /*
110          * Force FPU initialization:
111          */
112         clear_thread_flag(TIF_USEDFPU);
113         clear_used_math();
114
115         atomic_inc(&init_mm.mm_count);
116         current->active_mm = &init_mm;
117         if (current->mm)
118                 BUG();
119         enter_lazy_tlb(&init_mm, current);
120 }
121
122 /*
123  * VM halt and poweroff setup routines
124  */
125 char vmhalt_cmd[128] = "";
126 char vmpoff_cmd[128] = "";
127
128 static inline void strncpy_skip_quote(char *dst, char *src, int n)
129 {
130         int sx, dx;
131
132         dx = 0;
133         for (sx = 0; src[sx] != 0; sx++) {
134                 if (src[sx] == '"') continue;
135                 dst[dx++] = src[sx];
136                 if (dx >= n) break;
137         }
138 }
139
140 static int __init vmhalt_setup(char *str)
141 {
142         strncpy_skip_quote(vmhalt_cmd, str, 127);
143         vmhalt_cmd[127] = 0;
144         return 1;
145 }
146
147 __setup("vmhalt=", vmhalt_setup);
148
149 static int __init vmpoff_setup(char *str)
150 {
151         strncpy_skip_quote(vmpoff_cmd, str, 127);
152         vmpoff_cmd[127] = 0;
153         return 1;
154 }
155
156 __setup("vmpoff=", vmpoff_setup);
157
158 /*
159  * condev= and conmode= setup parameter.
160  */
161
162 static int __init condev_setup(char *str)
163 {
164         int vdev;
165
166         vdev = simple_strtoul(str, &str, 0);
167         if (vdev >= 0 && vdev < 65536) {
168                 console_devno = vdev;
169                 console_irq = -1;
170         }
171         return 1;
172 }
173
174 __setup("condev=", condev_setup);
175
176 static int __init conmode_setup(char *str)
177 {
178 #if defined(CONFIG_SCLP_CONSOLE)
179         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
180                 SET_CONSOLE_SCLP;
181 #endif
182 #if defined(CONFIG_TN3215_CONSOLE)
183         if (strncmp(str, "3215", 5) == 0)
184                 SET_CONSOLE_3215;
185 #endif
186 #if defined(CONFIG_TN3270_CONSOLE)
187         if (strncmp(str, "3270", 5) == 0)
188                 SET_CONSOLE_3270;
189 #endif
190         return 1;
191 }
192
193 __setup("conmode=", conmode_setup);
194
195 static void __init conmode_default(void)
196 {
197         char query_buffer[1024];
198         char *ptr;
199
200         if (MACHINE_IS_VM) {
201                 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
202                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
203                 ptr = strstr(query_buffer, "SUBCHANNEL =");
204                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
205                 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
206                 ptr = strstr(query_buffer, "CONMODE");
207                 /*
208                  * Set the conmode to 3215 so that the device recognition 
209                  * will set the cu_type of the console to 3215. If the
210                  * conmode is 3270 and we don't set it back then both
211                  * 3215 and the 3270 driver will try to access the console
212                  * device (3215 as console and 3270 as normal tty).
213                  */
214                 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
215                 if (ptr == NULL) {
216 #if defined(CONFIG_SCLP_CONSOLE)
217                         SET_CONSOLE_SCLP;
218 #endif
219                         return;
220                 }
221                 if (strncmp(ptr + 8, "3270", 4) == 0) {
222 #if defined(CONFIG_TN3270_CONSOLE)
223                         SET_CONSOLE_3270;
224 #elif defined(CONFIG_TN3215_CONSOLE)
225                         SET_CONSOLE_3215;
226 #elif defined(CONFIG_SCLP_CONSOLE)
227                         SET_CONSOLE_SCLP;
228 #endif
229                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
230 #if defined(CONFIG_TN3215_CONSOLE)
231                         SET_CONSOLE_3215;
232 #elif defined(CONFIG_TN3270_CONSOLE)
233                         SET_CONSOLE_3270;
234 #elif defined(CONFIG_SCLP_CONSOLE)
235                         SET_CONSOLE_SCLP;
236 #endif
237                 }
238         } else if (MACHINE_IS_P390) {
239 #if defined(CONFIG_TN3215_CONSOLE)
240                 SET_CONSOLE_3215;
241 #elif defined(CONFIG_TN3270_CONSOLE)
242                 SET_CONSOLE_3270;
243 #endif
244         } else {
245 #if defined(CONFIG_SCLP_CONSOLE)
246                 SET_CONSOLE_SCLP;
247 #endif
248         }
249 }
250
251 #ifdef CONFIG_SMP
252 extern void machine_restart_smp(char *);
253 extern void machine_halt_smp(void);
254 extern void machine_power_off_smp(void);
255
256 void (*_machine_restart)(char *command) = machine_restart_smp;
257 void (*_machine_halt)(void) = machine_halt_smp;
258 void (*_machine_power_off)(void) = machine_power_off_smp;
259 #else
260 /*
261  * Reboot, halt and power_off routines for non SMP.
262  */
263 extern void reipl(unsigned long devno);
264 extern void reipl_diag(void);
265 static void do_machine_restart_nonsmp(char * __unused)
266 {
267         reipl_diag();
268
269         if (MACHINE_IS_VM)
270                 cpcmd ("IPL", NULL, 0);
271         else
272                 reipl (0x10000 | S390_lowcore.ipl_device);
273 }
274
275 static void do_machine_halt_nonsmp(void)
276 {
277         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
278                 cpcmd(vmhalt_cmd, NULL, 0);
279         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
280 }
281
282 static void do_machine_power_off_nonsmp(void)
283 {
284         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
285                 cpcmd(vmpoff_cmd, NULL, 0);
286         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
287 }
288
289 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
290 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
291 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
292 #endif
293
294  /*
295  * Reboot, halt and power_off stubs. They just call _machine_restart,
296  * _machine_halt or _machine_power_off. 
297  */
298
299 void machine_restart(char *command)
300 {
301         console_unblank();
302         _machine_restart(command);
303 }
304
305 void machine_halt(void)
306 {
307         console_unblank();
308         _machine_halt();
309 }
310
311 void machine_power_off(void)
312 {
313         console_unblank();
314         _machine_power_off();
315 }
316
317 static void __init
318 add_memory_hole(unsigned long start, unsigned long end)
319 {
320         unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
321
322         if (end <= dma_pfn)
323                 zholes_size[ZONE_DMA] += end - start + 1;
324         else if (start > dma_pfn)
325                 zholes_size[ZONE_NORMAL] += end - start + 1;
326         else {
327                 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
328                 zholes_size[ZONE_NORMAL] += end - dma_pfn;
329         }
330 }
331
332 static void __init
333 parse_cmdline_early(char **cmdline_p)
334 {
335         char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
336         unsigned long delay = 0;
337
338         /* Save unparsed command line copy for /proc/cmdline */
339         memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
340         saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
341
342         for (;;) {
343                 /*
344                  * "mem=XXX[kKmM]" sets memsize
345                  */
346                 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
347                         memory_end = simple_strtoul(from+4, &from, 0);
348                         if ( *from == 'K' || *from == 'k' ) {
349                                 memory_end = memory_end << 10;
350                                 from++;
351                         } else if ( *from == 'M' || *from == 'm' ) {
352                                 memory_end = memory_end << 20;
353                                 from++;
354                         }
355                 }
356                 /*
357                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
358                  */
359                 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
360                         delay = simple_strtoul(from+9, &from, 0);
361                         if (*from == 's' || *from == 'S') {
362                                 delay = delay*1000000;
363                                 from++;
364                         } else if (*from == 'm' || *from == 'M') {
365                                 delay = delay*60*1000000;
366                                 from++;
367                         }
368                         /* now wait for the requested amount of time */
369                         udelay(delay);
370                 }
371                 cn = *(from++);
372                 if (!cn)
373                         break;
374                 if (cn == '\n')
375                         cn = ' ';  /* replace newlines with space */
376                 if (cn == 0x0d)
377                         cn = ' ';  /* replace 0x0d with space */
378                 if (cn == ' ' && c == ' ')
379                         continue;  /* remove additional spaces */
380                 c = cn;
381                 if (to - command_line >= COMMAND_LINE_SIZE)
382                         break;
383                 *(to++) = c;
384         }
385         if (c == ' ' && to > command_line) to--;
386         *to = '\0';
387         *cmdline_p = command_line;
388 }
389
390 static void __init
391 setup_lowcore(void)
392 {
393         struct _lowcore *lc;
394         int lc_pages;
395
396         /*
397          * Setup lowcore for boot cpu
398          */
399         lc_pages = sizeof(void *) == 8 ? 2 : 1;
400         lc = (struct _lowcore *)
401                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
402         memset(lc, 0, lc_pages * PAGE_SIZE);
403         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
404         lc->restart_psw.addr =
405                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
406         lc->external_new_psw.mask = PSW_KERNEL_BITS;
407         lc->external_new_psw.addr =
408                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
409         lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
410         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
411         lc->program_new_psw.mask = PSW_KERNEL_BITS;
412         lc->program_new_psw.addr =
413                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
414         lc->mcck_new_psw.mask =
415                 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
416         lc->mcck_new_psw.addr =
417                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
418         lc->io_new_psw.mask = PSW_KERNEL_BITS;
419         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
420         lc->ipl_device = S390_lowcore.ipl_device;
421         lc->jiffy_timer = -1LL;
422         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
423         lc->async_stack = (unsigned long)
424                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
425         lc->panic_stack = (unsigned long)
426                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
427         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
428         lc->thread_info = (unsigned long) &init_thread_union;
429 #ifndef CONFIG_ARCH_S390X
430         if (MACHINE_HAS_IEEE) {
431                 lc->extended_save_area_addr = (__u32)
432                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
433                 /* enable extended save area */
434                 ctl_set_bit(14, 29);
435         }
436 #endif
437         set_prefix((u32)(unsigned long) lc);
438 }
439
440 static void __init
441 setup_resources(void)
442 {
443         struct resource *res;
444         int i;
445
446         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
447                 res = alloc_bootmem_low(sizeof(struct resource));
448                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
449                 switch (memory_chunk[i].type) {
450                 case CHUNK_READ_WRITE:
451                         res->name = "System RAM";
452                         break;
453                 case CHUNK_READ_ONLY:
454                         res->name = "System ROM";
455                         res->flags |= IORESOURCE_READONLY;
456                         break;
457                 default:
458                         res->name = "reserved";
459                 }
460                 res->start = memory_chunk[i].addr;
461                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
462                 request_resource(&iomem_resource, res);
463                 request_resource(res, &code_resource);
464                 request_resource(res, &data_resource);
465         }
466 }
467
468 static void __init
469 setup_memory(void)
470 {
471         unsigned long bootmap_size;
472         unsigned long start_pfn, end_pfn, init_pfn;
473         unsigned long last_rw_end;
474         int i;
475
476         /*
477          * partially used pages are not usable - thus
478          * we are rounding upwards:
479          */
480         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
481         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
482
483         /* Initialize storage key for kernel pages */
484         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
485                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
486
487         /*
488          * Initialize the boot-time allocator (with low memory only):
489          */
490         bootmap_size = init_bootmem(start_pfn, end_pfn);
491
492         /*
493          * Register RAM areas with the bootmem allocator.
494          */
495         last_rw_end = start_pfn;
496
497         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
498                 unsigned long start_chunk, end_chunk;
499
500                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
501                         continue;
502                 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
503                 start_chunk >>= PAGE_SHIFT;
504                 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
505                 end_chunk >>= PAGE_SHIFT;
506                 if (start_chunk < start_pfn)
507                         start_chunk = start_pfn;
508                 if (end_chunk > end_pfn)
509                         end_chunk = end_pfn;
510                 if (start_chunk < end_chunk) {
511                         /* Initialize storage key for RAM pages */
512                         for (init_pfn = start_chunk ; init_pfn < end_chunk;
513                              init_pfn++)
514                                 page_set_storage_key(init_pfn << PAGE_SHIFT,
515                                                      PAGE_DEFAULT_KEY);
516                         free_bootmem(start_chunk << PAGE_SHIFT,
517                                      (end_chunk - start_chunk) << PAGE_SHIFT);
518                         if (last_rw_end < start_chunk)
519                                 add_memory_hole(last_rw_end, start_chunk - 1);
520                         last_rw_end = end_chunk;
521                 }
522         }
523
524         psw_set_key(PAGE_DEFAULT_KEY);
525
526         if (last_rw_end < end_pfn - 1)
527                 add_memory_hole(last_rw_end, end_pfn - 1);
528
529         /*
530          * Reserve the bootmem bitmap itself as well. We do this in two
531          * steps (first step was init_bootmem()) because this catches
532          * the (very unlikely) case of us accidentally initializing the
533          * bootmem allocator with an invalid RAM area.
534          */
535         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
536
537 #ifdef CONFIG_BLK_DEV_INITRD
538         if (INITRD_START) {
539                 if (INITRD_START + INITRD_SIZE <= memory_end) {
540                         reserve_bootmem(INITRD_START, INITRD_SIZE);
541                         initrd_start = INITRD_START;
542                         initrd_end = initrd_start + INITRD_SIZE;
543                 } else {
544                         printk("initrd extends beyond end of memory "
545                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
546                                initrd_start + INITRD_SIZE, memory_end);
547                         initrd_start = initrd_end = 0;
548                 }
549         }
550 #endif
551 }
552
553 /*
554  * Setup function called from init/main.c just after the banner
555  * was printed.
556  */
557
558 void __init
559 setup_arch(char **cmdline_p)
560 {
561         /*
562          * print what head.S has found out about the machine
563          */
564 #ifndef CONFIG_ARCH_S390X
565         printk((MACHINE_IS_VM) ?
566                "We are running under VM (31 bit mode)\n" :
567                "We are running native (31 bit mode)\n");
568         printk((MACHINE_HAS_IEEE) ?
569                "This machine has an IEEE fpu\n" :
570                "This machine has no IEEE fpu\n");
571 #else /* CONFIG_ARCH_S390X */
572         printk((MACHINE_IS_VM) ?
573                "We are running under VM (64 bit mode)\n" :
574                "We are running native (64 bit mode)\n");
575 #endif /* CONFIG_ARCH_S390X */
576
577         ROOT_DEV = Root_RAM0;
578 #ifndef CONFIG_ARCH_S390X
579         memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
580         /*
581          * We need some free virtual space to be able to do vmalloc.
582          * On a machine with 2GB memory we make sure that we have at
583          * least 128 MB free space for vmalloc.
584          */
585         if (memory_end > 1920*1024*1024)
586                 memory_end = 1920*1024*1024;
587 #else /* CONFIG_ARCH_S390X */
588         memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
589 #endif /* CONFIG_ARCH_S390X */
590
591         init_mm.start_code = PAGE_OFFSET;
592         init_mm.end_code = (unsigned long) &_etext;
593         init_mm.end_data = (unsigned long) &_edata;
594         init_mm.brk = (unsigned long) &_end;
595
596         parse_cmdline_early(cmdline_p);
597
598         setup_memory();
599         setup_resources();
600         setup_lowcore();
601
602         cpu_init();
603         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
604
605         /*
606          * Create kernel page tables and switch to virtual addressing.
607          */
608         paging_init();
609
610         /* Setup default console */
611         conmode_default();
612 }
613
614 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
615 {
616    printk("cpu %d "
617 #ifdef CONFIG_SMP
618            "phys_idx=%d "
619 #endif
620            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
621            cpuinfo->cpu_nr,
622 #ifdef CONFIG_SMP
623            cpuinfo->cpu_addr,
624 #endif
625            cpuinfo->cpu_id.version,
626            cpuinfo->cpu_id.ident,
627            cpuinfo->cpu_id.machine,
628            cpuinfo->cpu_id.unused);
629 }
630
631 /*
632  * show_cpuinfo - Get information on one CPU for use by procfs.
633  */
634
635 static int show_cpuinfo(struct seq_file *m, void *v)
636 {
637         struct cpuinfo_S390 *cpuinfo;
638         unsigned long n = (unsigned long) v - 1;
639
640         preempt_disable();
641         if (!n) {
642                 seq_printf(m, "vendor_id       : IBM/S390\n"
643                                "# processors    : %i\n"
644                                "bogomips per cpu: %lu.%02lu\n",
645                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
646                                (loops_per_jiffy/(5000/HZ))%100);
647         }
648         if (cpu_online(n)) {
649 #ifdef CONFIG_SMP
650                 if (smp_processor_id() == n)
651                         cpuinfo = &S390_lowcore.cpu_data;
652                 else
653                         cpuinfo = &lowcore_ptr[n]->cpu_data;
654 #else
655                 cpuinfo = &S390_lowcore.cpu_data;
656 #endif
657                 seq_printf(m, "processor %li: "
658                                "version = %02X,  "
659                                "identification = %06X,  "
660                                "machine = %04X\n",
661                                n, cpuinfo->cpu_id.version,
662                                cpuinfo->cpu_id.ident,
663                                cpuinfo->cpu_id.machine);
664         }
665         preempt_enable();
666         return 0;
667 }
668
669 static void *c_start(struct seq_file *m, loff_t *pos)
670 {
671         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
672 }
673 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
674 {
675         ++*pos;
676         return c_start(m, pos);
677 }
678 static void c_stop(struct seq_file *m, void *v)
679 {
680 }
681 struct seq_operations cpuinfo_op = {
682         .start  = c_start,
683         .next   = c_next,
684         .stop   = c_stop,
685         .show   = show_cpuinfo,
686 };
687