863c8d08c02694815ecb611d03292c7aba160262
[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/init.h>
32 #include <linux/initrd.h>
33 #include <linux/bootmem.h>
34 #include <linux/root_dev.h>
35 #include <linux/console.h>
36 #include <linux/seq_file.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/device.h>
39 #include <linux/notifier.h>
40 #include <linux/pfn.h>
41 #include <linux/ctype.h>
42 #include <linux/reboot.h>
43
44 #include <asm/ipl.h>
45 #include <asm/uaccess.h>
46 #include <asm/system.h>
47 #include <asm/smp.h>
48 #include <asm/mmu_context.h>
49 #include <asm/cpcmd.h>
50 #include <asm/lowcore.h>
51 #include <asm/irq.h>
52 #include <asm/page.h>
53 #include <asm/ptrace.h>
54 #include <asm/sections.h>
55 #include <asm/ebcdic.h>
56 #include <asm/compat.h>
57
58 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
59                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
60 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
61                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
62                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
63
64 /*
65  * User copy operations.
66  */
67 struct uaccess_ops uaccess;
68 EXPORT_SYMBOL_GPL(uaccess);
69
70 /*
71  * Machine setup..
72  */
73 unsigned int console_mode = 0;
74 unsigned int console_devno = -1;
75 unsigned int console_irq = -1;
76 unsigned long machine_flags = 0;
77
78 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
79 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
80 static unsigned long __initdata memory_end;
81
82 /*
83  * This is set up by the setup-routine at boot-time
84  * for S390 need to find out, what we have to setup
85  * using address 0x10400 ...
86  */
87
88 #include <asm/setup.h>
89
90 static struct resource code_resource = {
91         .name  = "Kernel code",
92         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
93 };
94
95 static struct resource data_resource = {
96         .name = "Kernel data",
97         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
98 };
99
100 /*
101  * cpu_init() initializes state that is per-CPU.
102  */
103 void __devinit cpu_init (void)
104 {
105         int addr = hard_smp_processor_id();
106
107         /*
108          * Store processor id in lowcore (used e.g. in timer_interrupt)
109          */
110         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
111         S390_lowcore.cpu_data.cpu_addr = addr;
112
113         /*
114          * Force FPU initialization:
115          */
116         clear_thread_flag(TIF_USEDFPU);
117         clear_used_math();
118
119         atomic_inc(&init_mm.mm_count);
120         current->active_mm = &init_mm;
121         if (current->mm)
122                 BUG();
123         enter_lazy_tlb(&init_mm, current);
124 }
125
126 /*
127  * VM halt and poweroff setup routines
128  */
129 char vmhalt_cmd[128] = "";
130 char vmpoff_cmd[128] = "";
131 static char vmpanic_cmd[128] = "";
132
133 static void strncpy_skip_quote(char *dst, char *src, int n)
134 {
135         int sx, dx;
136
137         dx = 0;
138         for (sx = 0; src[sx] != 0; sx++) {
139                 if (src[sx] == '"') continue;
140                 dst[dx++] = src[sx];
141                 if (dx >= n) break;
142         }
143 }
144
145 static int __init vmhalt_setup(char *str)
146 {
147         strncpy_skip_quote(vmhalt_cmd, str, 127);
148         vmhalt_cmd[127] = 0;
149         return 1;
150 }
151
152 __setup("vmhalt=", vmhalt_setup);
153
154 static int __init vmpoff_setup(char *str)
155 {
156         strncpy_skip_quote(vmpoff_cmd, str, 127);
157         vmpoff_cmd[127] = 0;
158         return 1;
159 }
160
161 __setup("vmpoff=", vmpoff_setup);
162
163 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
164                           void *data)
165 {
166         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
167                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
168
169         return NOTIFY_OK;
170 }
171
172 #define PANIC_PRI_VMPANIC       0
173
174 static struct notifier_block vmpanic_nb = {
175         .notifier_call = vmpanic_notify,
176         .priority = PANIC_PRI_VMPANIC
177 };
178
179 static int __init vmpanic_setup(char *str)
180 {
181         static int register_done __initdata = 0;
182
183         strncpy_skip_quote(vmpanic_cmd, str, 127);
184         vmpanic_cmd[127] = 0;
185         if (!register_done) {
186                 register_done = 1;
187                 atomic_notifier_chain_register(&panic_notifier_list,
188                                                &vmpanic_nb);
189         }
190         return 1;
191 }
192
193 __setup("vmpanic=", vmpanic_setup);
194
195 /*
196  * condev= and conmode= setup parameter.
197  */
198
199 static int __init condev_setup(char *str)
200 {
201         int vdev;
202
203         vdev = simple_strtoul(str, &str, 0);
204         if (vdev >= 0 && vdev < 65536) {
205                 console_devno = vdev;
206                 console_irq = -1;
207         }
208         return 1;
209 }
210
211 __setup("condev=", condev_setup);
212
213 static int __init conmode_setup(char *str)
214 {
215 #if defined(CONFIG_SCLP_CONSOLE)
216         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
217                 SET_CONSOLE_SCLP;
218 #endif
219 #if defined(CONFIG_TN3215_CONSOLE)
220         if (strncmp(str, "3215", 5) == 0)
221                 SET_CONSOLE_3215;
222 #endif
223 #if defined(CONFIG_TN3270_CONSOLE)
224         if (strncmp(str, "3270", 5) == 0)
225                 SET_CONSOLE_3270;
226 #endif
227         return 1;
228 }
229
230 __setup("conmode=", conmode_setup);
231
232 static void __init conmode_default(void)
233 {
234         char query_buffer[1024];
235         char *ptr;
236
237         if (MACHINE_IS_VM) {
238                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
239                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
240                 ptr = strstr(query_buffer, "SUBCHANNEL =");
241                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
242                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
243                 ptr = strstr(query_buffer, "CONMODE");
244                 /*
245                  * Set the conmode to 3215 so that the device recognition 
246                  * will set the cu_type of the console to 3215. If the
247                  * conmode is 3270 and we don't set it back then both
248                  * 3215 and the 3270 driver will try to access the console
249                  * device (3215 as console and 3270 as normal tty).
250                  */
251                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
252                 if (ptr == NULL) {
253 #if defined(CONFIG_SCLP_CONSOLE)
254                         SET_CONSOLE_SCLP;
255 #endif
256                         return;
257                 }
258                 if (strncmp(ptr + 8, "3270", 4) == 0) {
259 #if defined(CONFIG_TN3270_CONSOLE)
260                         SET_CONSOLE_3270;
261 #elif defined(CONFIG_TN3215_CONSOLE)
262                         SET_CONSOLE_3215;
263 #elif defined(CONFIG_SCLP_CONSOLE)
264                         SET_CONSOLE_SCLP;
265 #endif
266                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
267 #if defined(CONFIG_TN3215_CONSOLE)
268                         SET_CONSOLE_3215;
269 #elif defined(CONFIG_TN3270_CONSOLE)
270                         SET_CONSOLE_3270;
271 #elif defined(CONFIG_SCLP_CONSOLE)
272                         SET_CONSOLE_SCLP;
273 #endif
274                 }
275         } else if (MACHINE_IS_P390) {
276 #if defined(CONFIG_TN3215_CONSOLE)
277                 SET_CONSOLE_3215;
278 #elif defined(CONFIG_TN3270_CONSOLE)
279                 SET_CONSOLE_3270;
280 #endif
281         } else {
282 #if defined(CONFIG_SCLP_CONSOLE)
283                 SET_CONSOLE_SCLP;
284 #endif
285         }
286 }
287
288 #ifdef CONFIG_SMP
289 void (*_machine_restart)(char *command) = machine_restart_smp;
290 void (*_machine_halt)(void) = machine_halt_smp;
291 void (*_machine_power_off)(void) = machine_power_off_smp;
292 #else
293 /*
294  * Reboot, halt and power_off routines for non SMP.
295  */
296 static void do_machine_restart_nonsmp(char * __unused)
297 {
298         do_reipl();
299 }
300
301 static void do_machine_halt_nonsmp(void)
302 {
303         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
304                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
305         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
306 }
307
308 static void do_machine_power_off_nonsmp(void)
309 {
310         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
311                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
312         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
313 }
314
315 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
316 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
317 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
318 #endif
319
320  /*
321  * Reboot, halt and power_off stubs. They just call _machine_restart,
322  * _machine_halt or _machine_power_off. 
323  */
324
325 void machine_restart(char *command)
326 {
327         if (!in_interrupt() || oops_in_progress)
328                 /*
329                  * Only unblank the console if we are called in enabled
330                  * context or a bust_spinlocks cleared the way for us.
331                  */
332                 console_unblank();
333         _machine_restart(command);
334 }
335
336 void machine_halt(void)
337 {
338         if (!in_interrupt() || oops_in_progress)
339                 /*
340                  * Only unblank the console if we are called in enabled
341                  * context or a bust_spinlocks cleared the way for us.
342                  */
343                 console_unblank();
344         _machine_halt();
345 }
346
347 void machine_power_off(void)
348 {
349         if (!in_interrupt() || oops_in_progress)
350                 /*
351                  * Only unblank the console if we are called in enabled
352                  * context or a bust_spinlocks cleared the way for us.
353                  */
354                 console_unblank();
355         _machine_power_off();
356 }
357
358 /*
359  * Dummy power off function.
360  */
361 void (*pm_power_off)(void) = machine_power_off;
362
363 static int __init early_parse_mem(char *p)
364 {
365         memory_end = memparse(p, &p);
366         return 0;
367 }
368 early_param("mem", early_parse_mem);
369
370 /*
371  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
372  */
373 static int __init early_parse_ipldelay(char *p)
374 {
375         unsigned long delay = 0;
376
377         delay = simple_strtoul(p, &p, 0);
378
379         switch (*p) {
380         case 's':
381         case 'S':
382                 delay *= 1000000;
383                 break;
384         case 'm':
385         case 'M':
386                 delay *= 60 * 1000000;
387         }
388
389         /* now wait for the requested amount of time */
390         udelay(delay);
391
392         return 0;
393 }
394 early_param("ipldelay", early_parse_ipldelay);
395
396 #ifdef CONFIG_S390_SWITCH_AMODE
397 unsigned int switch_amode = 0;
398 EXPORT_SYMBOL_GPL(switch_amode);
399
400 static void set_amode_and_uaccess(unsigned long user_amode,
401                                   unsigned long user32_amode)
402 {
403         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
404                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
405                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
406 #ifdef CONFIG_COMPAT
407         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
408                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
409                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
410         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
411                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
412                           PSW32_MASK_PSTATE;
413 #endif
414         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
415                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
416
417         if (MACHINE_HAS_MVCOS) {
418                 printk("mvcos available.\n");
419                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
420         } else {
421                 printk("mvcos not available.\n");
422                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
423         }
424 }
425
426 /*
427  * Switch kernel/user addressing modes?
428  */
429 static int __init early_parse_switch_amode(char *p)
430 {
431         switch_amode = 1;
432         return 0;
433 }
434 early_param("switch_amode", early_parse_switch_amode);
435
436 #else /* CONFIG_S390_SWITCH_AMODE */
437 static inline void set_amode_and_uaccess(unsigned long user_amode,
438                                          unsigned long user32_amode)
439 {
440 }
441 #endif /* CONFIG_S390_SWITCH_AMODE */
442
443 #ifdef CONFIG_S390_EXEC_PROTECT
444 unsigned int s390_noexec = 0;
445 EXPORT_SYMBOL_GPL(s390_noexec);
446
447 /*
448  * Enable execute protection?
449  */
450 static int __init early_parse_noexec(char *p)
451 {
452         if (!strncmp(p, "off", 3))
453                 return 0;
454         switch_amode = 1;
455         s390_noexec = 1;
456         return 0;
457 }
458 early_param("noexec", early_parse_noexec);
459 #endif /* CONFIG_S390_EXEC_PROTECT */
460
461 static void setup_addressing_mode(void)
462 {
463         if (s390_noexec) {
464                 printk("S390 execute protection active, ");
465                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
466                 return;
467         }
468         if (switch_amode) {
469                 printk("S390 address spaces switched, ");
470                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
471         }
472 }
473
474 static void __init
475 setup_lowcore(void)
476 {
477         struct _lowcore *lc;
478         int lc_pages;
479
480         /*
481          * Setup lowcore for boot cpu
482          */
483         lc_pages = sizeof(void *) == 8 ? 2 : 1;
484         lc = (struct _lowcore *)
485                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
486         memset(lc, 0, lc_pages * PAGE_SIZE);
487         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
488         lc->restart_psw.addr =
489                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
490         if (switch_amode)
491                 lc->restart_psw.mask |= PSW_ASC_HOME;
492         lc->external_new_psw.mask = psw_kernel_bits;
493         lc->external_new_psw.addr =
494                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
495         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
496         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
497         lc->program_new_psw.mask = psw_kernel_bits;
498         lc->program_new_psw.addr =
499                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
500         lc->mcck_new_psw.mask =
501                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
502         lc->mcck_new_psw.addr =
503                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
504         lc->io_new_psw.mask = psw_kernel_bits;
505         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
506         lc->ipl_device = S390_lowcore.ipl_device;
507         lc->jiffy_timer = -1LL;
508         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
509         lc->async_stack = (unsigned long)
510                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
511         lc->panic_stack = (unsigned long)
512                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
513         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
514         lc->thread_info = (unsigned long) &init_thread_union;
515 #ifndef CONFIG_64BIT
516         if (MACHINE_HAS_IEEE) {
517                 lc->extended_save_area_addr = (__u32)
518                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
519                 /* enable extended save area */
520                 __ctl_set_bit(14, 29);
521         }
522 #endif
523         set_prefix((u32)(unsigned long) lc);
524 }
525
526 static void __init
527 setup_resources(void)
528 {
529         struct resource *res, *sub_res;
530         int i;
531
532         code_resource.start = (unsigned long) &_text;
533         code_resource.end = (unsigned long) &_etext - 1;
534         data_resource.start = (unsigned long) &_etext;
535         data_resource.end = (unsigned long) &_edata - 1;
536
537         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
538                 res = alloc_bootmem_low(sizeof(struct resource));
539                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
540                 switch (memory_chunk[i].type) {
541                 case CHUNK_READ_WRITE:
542                         res->name = "System RAM";
543                         break;
544                 case CHUNK_READ_ONLY:
545                         res->name = "System ROM";
546                         res->flags |= IORESOURCE_READONLY;
547                         break;
548                 default:
549                         res->name = "reserved";
550                 }
551                 res->start = memory_chunk[i].addr;
552                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
553                 request_resource(&iomem_resource, res);
554
555                 if (code_resource.start >= res->start  &&
556                         code_resource.start <= res->end &&
557                         code_resource.end > res->end) {
558                         sub_res = alloc_bootmem_low(sizeof(struct resource));
559                         memcpy(sub_res, &code_resource,
560                                 sizeof(struct resource));
561                         sub_res->end = res->end;
562                         code_resource.start = res->end + 1;
563                         request_resource(res, sub_res);
564                 }
565
566                 if (code_resource.start >= res->start &&
567                         code_resource.start <= res->end &&
568                         code_resource.end <= res->end)
569                         request_resource(res, &code_resource);
570
571                 if (data_resource.start >= res->start &&
572                         data_resource.start <= res->end &&
573                         data_resource.end > res->end) {
574                         sub_res = alloc_bootmem_low(sizeof(struct resource));
575                         memcpy(sub_res, &data_resource,
576                                 sizeof(struct resource));
577                         sub_res->end = res->end;
578                         data_resource.start = res->end + 1;
579                         request_resource(res, sub_res);
580                 }
581
582                 if (data_resource.start >= res->start &&
583                         data_resource.start <= res->end &&
584                         data_resource.end <= res->end)
585                         request_resource(res, &data_resource);
586         }
587 }
588
589 static void __init setup_memory_end(void)
590 {
591         unsigned long real_size, memory_size;
592         unsigned long max_mem, max_phys;
593         int i;
594
595         memory_size = real_size = 0;
596         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
597         memory_end &= PAGE_MASK;
598
599         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
600
601         for (i = 0; i < MEMORY_CHUNKS; i++) {
602                 struct mem_chunk *chunk = &memory_chunk[i];
603
604                 real_size = max(real_size, chunk->addr + chunk->size);
605                 if (chunk->addr >= max_mem) {
606                         memset(chunk, 0, sizeof(*chunk));
607                         continue;
608                 }
609                 if (chunk->addr + chunk->size > max_mem)
610                         chunk->size = max_mem - chunk->addr;
611                 memory_size = max(memory_size, chunk->addr + chunk->size);
612         }
613         if (!memory_end)
614                 memory_end = memory_size;
615 }
616
617 static void __init
618 setup_memory(void)
619 {
620         unsigned long bootmap_size;
621         unsigned long start_pfn, end_pfn;
622         int i;
623
624         /*
625          * partially used pages are not usable - thus
626          * we are rounding upwards:
627          */
628         start_pfn = PFN_UP(__pa(&_end));
629         end_pfn = max_pfn = PFN_DOWN(memory_end);
630
631 #ifdef CONFIG_BLK_DEV_INITRD
632         /*
633          * Move the initrd in case the bitmap of the bootmem allocater
634          * would overwrite it.
635          */
636
637         if (INITRD_START && INITRD_SIZE) {
638                 unsigned long bmap_size;
639                 unsigned long start;
640
641                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
642                 bmap_size = PFN_PHYS(bmap_size);
643
644                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
645                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
646
647                         if (start + INITRD_SIZE > memory_end) {
648                                 printk("initrd extends beyond end of memory "
649                                        "(0x%08lx > 0x%08lx)\n"
650                                        "disabling initrd\n",
651                                        start + INITRD_SIZE, memory_end);
652                                 INITRD_START = INITRD_SIZE = 0;
653                         } else {
654                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
655                                        "size: %ld)\n",
656                                        INITRD_START, start, INITRD_SIZE);
657                                 memmove((void *) start, (void *) INITRD_START,
658                                         INITRD_SIZE);
659                                 INITRD_START = start;
660                         }
661                 }
662         }
663 #endif
664
665         /*
666          * Initialize the boot-time allocator
667          */
668         bootmap_size = init_bootmem(start_pfn, end_pfn);
669
670         /*
671          * Register RAM areas with the bootmem allocator.
672          */
673
674         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
675                 unsigned long start_chunk, end_chunk, pfn;
676
677                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
678                         continue;
679                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
680                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
681                 end_chunk = min(end_chunk, end_pfn);
682                 if (start_chunk >= end_chunk)
683                         continue;
684                 add_active_range(0, start_chunk, end_chunk);
685                 pfn = max(start_chunk, start_pfn);
686                 for (; pfn <= end_chunk; pfn++)
687                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
688         }
689
690         psw_set_key(PAGE_DEFAULT_KEY);
691
692         free_bootmem_with_active_regions(0, max_pfn);
693
694         /*
695          * Reserve memory used for lowcore/command line/kernel image.
696          */
697         reserve_bootmem(0, (unsigned long)_ehead);
698         reserve_bootmem((unsigned long)_stext,
699                         PFN_PHYS(start_pfn) - (unsigned long)_stext);
700         /*
701          * Reserve the bootmem bitmap itself as well. We do this in two
702          * steps (first step was init_bootmem()) because this catches
703          * the (very unlikely) case of us accidentally initializing the
704          * bootmem allocator with an invalid RAM area.
705          */
706         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
707
708 #ifdef CONFIG_BLK_DEV_INITRD
709         if (INITRD_START && INITRD_SIZE) {
710                 if (INITRD_START + INITRD_SIZE <= memory_end) {
711                         reserve_bootmem(INITRD_START, INITRD_SIZE);
712                         initrd_start = INITRD_START;
713                         initrd_end = initrd_start + INITRD_SIZE;
714                 } else {
715                         printk("initrd extends beyond end of memory "
716                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
717                                initrd_start + INITRD_SIZE, memory_end);
718                         initrd_start = initrd_end = 0;
719                 }
720         }
721 #endif
722 }
723
724 /*
725  * Setup function called from init/main.c just after the banner
726  * was printed.
727  */
728
729 void __init
730 setup_arch(char **cmdline_p)
731 {
732         /*
733          * print what head.S has found out about the machine
734          */
735 #ifndef CONFIG_64BIT
736         printk((MACHINE_IS_VM) ?
737                "We are running under VM (31 bit mode)\n" :
738                "We are running native (31 bit mode)\n");
739         printk((MACHINE_HAS_IEEE) ?
740                "This machine has an IEEE fpu\n" :
741                "This machine has no IEEE fpu\n");
742 #else /* CONFIG_64BIT */
743         printk((MACHINE_IS_VM) ?
744                "We are running under VM (64 bit mode)\n" :
745                "We are running native (64 bit mode)\n");
746 #endif /* CONFIG_64BIT */
747
748         /* Save unparsed command line copy for /proc/cmdline */
749         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
750
751         *cmdline_p = COMMAND_LINE;
752         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
753
754         ROOT_DEV = Root_RAM0;
755
756         init_mm.start_code = PAGE_OFFSET;
757         init_mm.end_code = (unsigned long) &_etext;
758         init_mm.end_data = (unsigned long) &_edata;
759         init_mm.brk = (unsigned long) &_end;
760
761         if (MACHINE_HAS_MVCOS)
762                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
763         else
764                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
765
766         parse_early_param();
767
768         setup_memory_end();
769         setup_addressing_mode();
770         setup_memory();
771         setup_resources();
772         setup_lowcore();
773
774         cpu_init();
775         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
776         smp_setup_cpu_possible_map();
777
778         /*
779          * Create kernel page tables and switch to virtual addressing.
780          */
781         paging_init();
782
783         /* Setup default console */
784         conmode_default();
785 }
786
787 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
788 {
789    printk("cpu %d "
790 #ifdef CONFIG_SMP
791            "phys_idx=%d "
792 #endif
793            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
794            cpuinfo->cpu_nr,
795 #ifdef CONFIG_SMP
796            cpuinfo->cpu_addr,
797 #endif
798            cpuinfo->cpu_id.version,
799            cpuinfo->cpu_id.ident,
800            cpuinfo->cpu_id.machine,
801            cpuinfo->cpu_id.unused);
802 }
803
804 /*
805  * show_cpuinfo - Get information on one CPU for use by procfs.
806  */
807
808 static int show_cpuinfo(struct seq_file *m, void *v)
809 {
810         struct cpuinfo_S390 *cpuinfo;
811         unsigned long n = (unsigned long) v - 1;
812
813         s390_adjust_jiffies();
814         preempt_disable();
815         if (!n) {
816                 seq_printf(m, "vendor_id       : IBM/S390\n"
817                                "# processors    : %i\n"
818                                "bogomips per cpu: %lu.%02lu\n",
819                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
820                                (loops_per_jiffy/(5000/HZ))%100);
821         }
822         if (cpu_online(n)) {
823 #ifdef CONFIG_SMP
824                 if (smp_processor_id() == n)
825                         cpuinfo = &S390_lowcore.cpu_data;
826                 else
827                         cpuinfo = &lowcore_ptr[n]->cpu_data;
828 #else
829                 cpuinfo = &S390_lowcore.cpu_data;
830 #endif
831                 seq_printf(m, "processor %li: "
832                                "version = %02X,  "
833                                "identification = %06X,  "
834                                "machine = %04X\n",
835                                n, cpuinfo->cpu_id.version,
836                                cpuinfo->cpu_id.ident,
837                                cpuinfo->cpu_id.machine);
838         }
839         preempt_enable();
840         return 0;
841 }
842
843 static void *c_start(struct seq_file *m, loff_t *pos)
844 {
845         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
846 }
847 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
848 {
849         ++*pos;
850         return c_start(m, pos);
851 }
852 static void c_stop(struct seq_file *m, void *v)
853 {
854 }
855 struct seq_operations cpuinfo_op = {
856         .start  = c_start,
857         .next   = c_next,
858         .stop   = c_stop,
859         .show   = show_cpuinfo,
860 };
861