[S390] noexec protection
[safe/jmp/linux-2.6] / 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/reboot.h>
42
43 #include <asm/uaccess.h>
44 #include <asm/system.h>
45 #include <asm/smp.h>
46 #include <asm/mmu_context.h>
47 #include <asm/cpcmd.h>
48 #include <asm/lowcore.h>
49 #include <asm/irq.h>
50 #include <asm/page.h>
51 #include <asm/ptrace.h>
52 #include <asm/sections.h>
53 #include <asm/compat.h>
54
55 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
56                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
57 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
58                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
59                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
60
61 /*
62  * User copy operations.
63  */
64 struct uaccess_ops uaccess;
65 EXPORT_SYMBOL_GPL(uaccess);
66
67 /*
68  * Machine setup..
69  */
70 unsigned int console_mode = 0;
71 unsigned int console_devno = -1;
72 unsigned int console_irq = -1;
73 unsigned long machine_flags = 0;
74
75 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
76 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
77 static unsigned long __initdata memory_end;
78
79 /*
80  * This is set up by the setup-routine at boot-time
81  * for S390 need to find out, what we have to setup
82  * using address 0x10400 ...
83  */
84
85 #include <asm/setup.h>
86
87 static struct resource code_resource = {
88         .name  = "Kernel code",
89         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
90 };
91
92 static struct resource data_resource = {
93         .name = "Kernel data",
94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
95 };
96
97 /*
98  * cpu_init() initializes state that is per-CPU.
99  */
100 void __devinit cpu_init (void)
101 {
102         int addr = hard_smp_processor_id();
103
104         /*
105          * Store processor id in lowcore (used e.g. in timer_interrupt)
106          */
107         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
108         S390_lowcore.cpu_data.cpu_addr = addr;
109
110         /*
111          * Force FPU initialization:
112          */
113         clear_thread_flag(TIF_USEDFPU);
114         clear_used_math();
115
116         atomic_inc(&init_mm.mm_count);
117         current->active_mm = &init_mm;
118         if (current->mm)
119                 BUG();
120         enter_lazy_tlb(&init_mm, current);
121 }
122
123 /*
124  * VM halt and poweroff setup routines
125  */
126 char vmhalt_cmd[128] = "";
127 char vmpoff_cmd[128] = "";
128 static char vmpanic_cmd[128] = "";
129
130 static inline void strncpy_skip_quote(char *dst, char *src, int n)
131 {
132         int sx, dx;
133
134         dx = 0;
135         for (sx = 0; src[sx] != 0; sx++) {
136                 if (src[sx] == '"') continue;
137                 dst[dx++] = src[sx];
138                 if (dx >= n) break;
139         }
140 }
141
142 static int __init vmhalt_setup(char *str)
143 {
144         strncpy_skip_quote(vmhalt_cmd, str, 127);
145         vmhalt_cmd[127] = 0;
146         return 1;
147 }
148
149 __setup("vmhalt=", vmhalt_setup);
150
151 static int __init vmpoff_setup(char *str)
152 {
153         strncpy_skip_quote(vmpoff_cmd, str, 127);
154         vmpoff_cmd[127] = 0;
155         return 1;
156 }
157
158 __setup("vmpoff=", vmpoff_setup);
159
160 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
161                           void *data)
162 {
163         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
164                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
165
166         return NOTIFY_OK;
167 }
168
169 #define PANIC_PRI_VMPANIC       0
170
171 static struct notifier_block vmpanic_nb = {
172         .notifier_call = vmpanic_notify,
173         .priority = PANIC_PRI_VMPANIC
174 };
175
176 static int __init vmpanic_setup(char *str)
177 {
178         static int register_done __initdata = 0;
179
180         strncpy_skip_quote(vmpanic_cmd, str, 127);
181         vmpanic_cmd[127] = 0;
182         if (!register_done) {
183                 register_done = 1;
184                 atomic_notifier_chain_register(&panic_notifier_list,
185                                                &vmpanic_nb);
186         }
187         return 1;
188 }
189
190 __setup("vmpanic=", vmpanic_setup);
191
192 /*
193  * condev= and conmode= setup parameter.
194  */
195
196 static int __init condev_setup(char *str)
197 {
198         int vdev;
199
200         vdev = simple_strtoul(str, &str, 0);
201         if (vdev >= 0 && vdev < 65536) {
202                 console_devno = vdev;
203                 console_irq = -1;
204         }
205         return 1;
206 }
207
208 __setup("condev=", condev_setup);
209
210 static int __init conmode_setup(char *str)
211 {
212 #if defined(CONFIG_SCLP_CONSOLE)
213         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
214                 SET_CONSOLE_SCLP;
215 #endif
216 #if defined(CONFIG_TN3215_CONSOLE)
217         if (strncmp(str, "3215", 5) == 0)
218                 SET_CONSOLE_3215;
219 #endif
220 #if defined(CONFIG_TN3270_CONSOLE)
221         if (strncmp(str, "3270", 5) == 0)
222                 SET_CONSOLE_3270;
223 #endif
224         return 1;
225 }
226
227 __setup("conmode=", conmode_setup);
228
229 static void __init conmode_default(void)
230 {
231         char query_buffer[1024];
232         char *ptr;
233
234         if (MACHINE_IS_VM) {
235                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
236                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
237                 ptr = strstr(query_buffer, "SUBCHANNEL =");
238                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
239                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
240                 ptr = strstr(query_buffer, "CONMODE");
241                 /*
242                  * Set the conmode to 3215 so that the device recognition 
243                  * will set the cu_type of the console to 3215. If the
244                  * conmode is 3270 and we don't set it back then both
245                  * 3215 and the 3270 driver will try to access the console
246                  * device (3215 as console and 3270 as normal tty).
247                  */
248                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
249                 if (ptr == NULL) {
250 #if defined(CONFIG_SCLP_CONSOLE)
251                         SET_CONSOLE_SCLP;
252 #endif
253                         return;
254                 }
255                 if (strncmp(ptr + 8, "3270", 4) == 0) {
256 #if defined(CONFIG_TN3270_CONSOLE)
257                         SET_CONSOLE_3270;
258 #elif defined(CONFIG_TN3215_CONSOLE)
259                         SET_CONSOLE_3215;
260 #elif defined(CONFIG_SCLP_CONSOLE)
261                         SET_CONSOLE_SCLP;
262 #endif
263                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
264 #if defined(CONFIG_TN3215_CONSOLE)
265                         SET_CONSOLE_3215;
266 #elif defined(CONFIG_TN3270_CONSOLE)
267                         SET_CONSOLE_3270;
268 #elif defined(CONFIG_SCLP_CONSOLE)
269                         SET_CONSOLE_SCLP;
270 #endif
271                 }
272         } else if (MACHINE_IS_P390) {
273 #if defined(CONFIG_TN3215_CONSOLE)
274                 SET_CONSOLE_3215;
275 #elif defined(CONFIG_TN3270_CONSOLE)
276                 SET_CONSOLE_3270;
277 #endif
278         } else {
279 #if defined(CONFIG_SCLP_CONSOLE)
280                 SET_CONSOLE_SCLP;
281 #endif
282         }
283 }
284
285 #ifdef CONFIG_SMP
286 void (*_machine_restart)(char *command) = machine_restart_smp;
287 void (*_machine_halt)(void) = machine_halt_smp;
288 void (*_machine_power_off)(void) = machine_power_off_smp;
289 #else
290 /*
291  * Reboot, halt and power_off routines for non SMP.
292  */
293 static void do_machine_restart_nonsmp(char * __unused)
294 {
295         do_reipl();
296 }
297
298 static void do_machine_halt_nonsmp(void)
299 {
300         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
301                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
302         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
303 }
304
305 static void do_machine_power_off_nonsmp(void)
306 {
307         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
308                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
309         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
310 }
311
312 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
313 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
314 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
315 #endif
316
317  /*
318  * Reboot, halt and power_off stubs. They just call _machine_restart,
319  * _machine_halt or _machine_power_off. 
320  */
321
322 void machine_restart(char *command)
323 {
324         if (!in_interrupt() || oops_in_progress)
325                 /*
326                  * Only unblank the console if we are called in enabled
327                  * context or a bust_spinlocks cleared the way for us.
328                  */
329                 console_unblank();
330         _machine_restart(command);
331 }
332
333 void machine_halt(void)
334 {
335         if (!in_interrupt() || oops_in_progress)
336                 /*
337                  * Only unblank the console if we are called in enabled
338                  * context or a bust_spinlocks cleared the way for us.
339                  */
340                 console_unblank();
341         _machine_halt();
342 }
343
344 void machine_power_off(void)
345 {
346         if (!in_interrupt() || oops_in_progress)
347                 /*
348                  * Only unblank the console if we are called in enabled
349                  * context or a bust_spinlocks cleared the way for us.
350                  */
351                 console_unblank();
352         _machine_power_off();
353 }
354
355 /*
356  * Dummy power off function.
357  */
358 void (*pm_power_off)(void) = machine_power_off;
359
360 static int __init early_parse_mem(char *p)
361 {
362         memory_end = memparse(p, &p);
363         return 0;
364 }
365 early_param("mem", early_parse_mem);
366
367 /*
368  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
369  */
370 static int __init early_parse_ipldelay(char *p)
371 {
372         unsigned long delay = 0;
373
374         delay = simple_strtoul(p, &p, 0);
375
376         switch (*p) {
377         case 's':
378         case 'S':
379                 delay *= 1000000;
380                 break;
381         case 'm':
382         case 'M':
383                 delay *= 60 * 1000000;
384         }
385
386         /* now wait for the requested amount of time */
387         udelay(delay);
388
389         return 0;
390 }
391 early_param("ipldelay", early_parse_ipldelay);
392
393 #ifdef CONFIG_S390_SWITCH_AMODE
394 unsigned int switch_amode = 0;
395 EXPORT_SYMBOL_GPL(switch_amode);
396
397 static inline void set_amode_and_uaccess(unsigned long user_amode,
398                                          unsigned long user32_amode)
399 {
400         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
401                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
402                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
403 #ifdef CONFIG_COMPAT
404         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
405                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
406                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
407         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
408                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
409                           PSW32_MASK_PSTATE;
410 #endif
411         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
412                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
413
414         if (MACHINE_HAS_MVCOS) {
415                 printk("mvcos available.\n");
416                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
417         } else {
418                 printk("mvcos not available.\n");
419                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
420         }
421 }
422
423 /*
424  * Switch kernel/user addressing modes?
425  */
426 static int __init early_parse_switch_amode(char *p)
427 {
428         switch_amode = 1;
429         return 0;
430 }
431 early_param("switch_amode", early_parse_switch_amode);
432
433 #else /* CONFIG_S390_SWITCH_AMODE */
434 static inline void set_amode_and_uaccess(unsigned long user_amode,
435                                          unsigned long user32_amode)
436 {
437 }
438 #endif /* CONFIG_S390_SWITCH_AMODE */
439
440 #ifdef CONFIG_S390_EXEC_PROTECT
441 unsigned int s390_noexec = 0;
442 EXPORT_SYMBOL_GPL(s390_noexec);
443
444 /*
445  * Enable execute protection?
446  */
447 static int __init early_parse_noexec(char *p)
448 {
449         if (!strncmp(p, "off", 3))
450                 return 0;
451         switch_amode = 1;
452         s390_noexec = 1;
453         return 0;
454 }
455 early_param("noexec", early_parse_noexec);
456 #endif /* CONFIG_S390_EXEC_PROTECT */
457
458 static void setup_addressing_mode(void)
459 {
460         if (s390_noexec) {
461                 printk("S390 execute protection active, ");
462                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
463                 return;
464         }
465         if (switch_amode) {
466                 printk("S390 address spaces switched, ");
467                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
468         }
469 }
470
471 static void __init
472 setup_lowcore(void)
473 {
474         struct _lowcore *lc;
475         int lc_pages;
476
477         /*
478          * Setup lowcore for boot cpu
479          */
480         lc_pages = sizeof(void *) == 8 ? 2 : 1;
481         lc = (struct _lowcore *)
482                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
483         memset(lc, 0, lc_pages * PAGE_SIZE);
484         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
485         lc->restart_psw.addr =
486                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
487         if (switch_amode)
488                 lc->restart_psw.mask |= PSW_ASC_HOME;
489         lc->external_new_psw.mask = psw_kernel_bits;
490         lc->external_new_psw.addr =
491                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
492         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
493         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
494         lc->program_new_psw.mask = psw_kernel_bits;
495         lc->program_new_psw.addr =
496                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
497         lc->mcck_new_psw.mask =
498                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
499         lc->mcck_new_psw.addr =
500                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
501         lc->io_new_psw.mask = psw_kernel_bits;
502         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
503         lc->ipl_device = S390_lowcore.ipl_device;
504         lc->jiffy_timer = -1LL;
505         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
506         lc->async_stack = (unsigned long)
507                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
508         lc->panic_stack = (unsigned long)
509                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
510         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
511         lc->thread_info = (unsigned long) &init_thread_union;
512 #ifndef CONFIG_64BIT
513         if (MACHINE_HAS_IEEE) {
514                 lc->extended_save_area_addr = (__u32)
515                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
516                 /* enable extended save area */
517                 __ctl_set_bit(14, 29);
518         }
519 #endif
520         set_prefix((u32)(unsigned long) lc);
521 }
522
523 static void __init
524 setup_resources(void)
525 {
526         struct resource *res;
527         int i;
528
529         code_resource.start = (unsigned long) &_text;
530         code_resource.end = (unsigned long) &_etext - 1;
531         data_resource.start = (unsigned long) &_etext;
532         data_resource.end = (unsigned long) &_edata - 1;
533
534         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
535                 res = alloc_bootmem_low(sizeof(struct resource));
536                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
537                 switch (memory_chunk[i].type) {
538                 case CHUNK_READ_WRITE:
539                         res->name = "System RAM";
540                         break;
541                 case CHUNK_READ_ONLY:
542                         res->name = "System ROM";
543                         res->flags |= IORESOURCE_READONLY;
544                         break;
545                 default:
546                         res->name = "reserved";
547                 }
548                 res->start = memory_chunk[i].addr;
549                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
550                 request_resource(&iomem_resource, res);
551                 request_resource(res, &code_resource);
552                 request_resource(res, &data_resource);
553         }
554 }
555
556 static void __init setup_memory_end(void)
557 {
558         unsigned long real_size, memory_size;
559         unsigned long max_mem, max_phys;
560         int i;
561
562         memory_size = real_size = 0;
563         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
564         memory_end &= PAGE_MASK;
565
566         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
567
568         for (i = 0; i < MEMORY_CHUNKS; i++) {
569                 struct mem_chunk *chunk = &memory_chunk[i];
570
571                 real_size = max(real_size, chunk->addr + chunk->size);
572                 if (chunk->addr >= max_mem) {
573                         memset(chunk, 0, sizeof(*chunk));
574                         continue;
575                 }
576                 if (chunk->addr + chunk->size > max_mem)
577                         chunk->size = max_mem - chunk->addr;
578                 memory_size = max(memory_size, chunk->addr + chunk->size);
579         }
580         if (!memory_end)
581                 memory_end = memory_size;
582 }
583
584 static void __init
585 setup_memory(void)
586 {
587         unsigned long bootmap_size;
588         unsigned long start_pfn, end_pfn, init_pfn;
589         int i;
590
591         /*
592          * partially used pages are not usable - thus
593          * we are rounding upwards:
594          */
595         start_pfn = PFN_UP(__pa(&_end));
596         end_pfn = max_pfn = PFN_DOWN(memory_end);
597
598         /* Initialize storage key for kernel pages */
599         for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
600                 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
601
602 #ifdef CONFIG_BLK_DEV_INITRD
603         /*
604          * Move the initrd in case the bitmap of the bootmem allocater
605          * would overwrite it.
606          */
607
608         if (INITRD_START && INITRD_SIZE) {
609                 unsigned long bmap_size;
610                 unsigned long start;
611
612                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
613                 bmap_size = PFN_PHYS(bmap_size);
614
615                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
616                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
617
618                         if (start + INITRD_SIZE > memory_end) {
619                                 printk("initrd extends beyond end of memory "
620                                        "(0x%08lx > 0x%08lx)\n"
621                                        "disabling initrd\n",
622                                        start + INITRD_SIZE, memory_end);
623                                 INITRD_START = INITRD_SIZE = 0;
624                         } else {
625                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
626                                        "size: %ld)\n",
627                                        INITRD_START, start, INITRD_SIZE);
628                                 memmove((void *) start, (void *) INITRD_START,
629                                         INITRD_SIZE);
630                                 INITRD_START = start;
631                         }
632                 }
633         }
634 #endif
635
636         /*
637          * Initialize the boot-time allocator
638          */
639         bootmap_size = init_bootmem(start_pfn, end_pfn);
640
641         /*
642          * Register RAM areas with the bootmem allocator.
643          */
644
645         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
646                 unsigned long start_chunk, end_chunk, pfn;
647
648                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
649                         continue;
650                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
651                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
652                 end_chunk = min(end_chunk, end_pfn);
653                 if (start_chunk >= end_chunk)
654                         continue;
655                 add_active_range(0, start_chunk, end_chunk);
656                 pfn = max(start_chunk, start_pfn);
657                 for (; pfn <= end_chunk; pfn++)
658                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
659         }
660
661         psw_set_key(PAGE_DEFAULT_KEY);
662
663         free_bootmem_with_active_regions(0, max_pfn);
664         reserve_bootmem(0, PFN_PHYS(start_pfn));
665
666         /*
667          * Reserve the bootmem bitmap itself as well. We do this in two
668          * steps (first step was init_bootmem()) because this catches
669          * the (very unlikely) case of us accidentally initializing the
670          * bootmem allocator with an invalid RAM area.
671          */
672         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
673
674 #ifdef CONFIG_BLK_DEV_INITRD
675         if (INITRD_START && INITRD_SIZE) {
676                 if (INITRD_START + INITRD_SIZE <= memory_end) {
677                         reserve_bootmem(INITRD_START, INITRD_SIZE);
678                         initrd_start = INITRD_START;
679                         initrd_end = initrd_start + INITRD_SIZE;
680                 } else {
681                         printk("initrd extends beyond end of memory "
682                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
683                                initrd_start + INITRD_SIZE, memory_end);
684                         initrd_start = initrd_end = 0;
685                 }
686         }
687 #endif
688 }
689
690 /*
691  * Setup function called from init/main.c just after the banner
692  * was printed.
693  */
694
695 void __init
696 setup_arch(char **cmdline_p)
697 {
698         /*
699          * print what head.S has found out about the machine
700          */
701 #ifndef CONFIG_64BIT
702         printk((MACHINE_IS_VM) ?
703                "We are running under VM (31 bit mode)\n" :
704                "We are running native (31 bit mode)\n");
705         printk((MACHINE_HAS_IEEE) ?
706                "This machine has an IEEE fpu\n" :
707                "This machine has no IEEE fpu\n");
708 #else /* CONFIG_64BIT */
709         printk((MACHINE_IS_VM) ?
710                "We are running under VM (64 bit mode)\n" :
711                "We are running native (64 bit mode)\n");
712 #endif /* CONFIG_64BIT */
713
714         /* Save unparsed command line copy for /proc/cmdline */
715         strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
716
717         *cmdline_p = COMMAND_LINE;
718         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
719
720         ROOT_DEV = Root_RAM0;
721
722         init_mm.start_code = PAGE_OFFSET;
723         init_mm.end_code = (unsigned long) &_etext;
724         init_mm.end_data = (unsigned long) &_edata;
725         init_mm.brk = (unsigned long) &_end;
726
727         if (MACHINE_HAS_MVCOS)
728                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
729         else
730                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
731
732         parse_early_param();
733
734         setup_memory_end();
735         setup_addressing_mode();
736         setup_memory();
737         setup_resources();
738         setup_lowcore();
739
740         cpu_init();
741         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
742         smp_setup_cpu_possible_map();
743
744         /*
745          * Create kernel page tables and switch to virtual addressing.
746          */
747         paging_init();
748
749         /* Setup default console */
750         conmode_default();
751 }
752
753 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
754 {
755    printk("cpu %d "
756 #ifdef CONFIG_SMP
757            "phys_idx=%d "
758 #endif
759            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
760            cpuinfo->cpu_nr,
761 #ifdef CONFIG_SMP
762            cpuinfo->cpu_addr,
763 #endif
764            cpuinfo->cpu_id.version,
765            cpuinfo->cpu_id.ident,
766            cpuinfo->cpu_id.machine,
767            cpuinfo->cpu_id.unused);
768 }
769
770 /*
771  * show_cpuinfo - Get information on one CPU for use by procfs.
772  */
773
774 static int show_cpuinfo(struct seq_file *m, void *v)
775 {
776         struct cpuinfo_S390 *cpuinfo;
777         unsigned long n = (unsigned long) v - 1;
778
779         preempt_disable();
780         if (!n) {
781                 seq_printf(m, "vendor_id       : IBM/S390\n"
782                                "# processors    : %i\n"
783                                "bogomips per cpu: %lu.%02lu\n",
784                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
785                                (loops_per_jiffy/(5000/HZ))%100);
786         }
787         if (cpu_online(n)) {
788 #ifdef CONFIG_SMP
789                 if (smp_processor_id() == n)
790                         cpuinfo = &S390_lowcore.cpu_data;
791                 else
792                         cpuinfo = &lowcore_ptr[n]->cpu_data;
793 #else
794                 cpuinfo = &S390_lowcore.cpu_data;
795 #endif
796                 seq_printf(m, "processor %li: "
797                                "version = %02X,  "
798                                "identification = %06X,  "
799                                "machine = %04X\n",
800                                n, cpuinfo->cpu_id.version,
801                                cpuinfo->cpu_id.ident,
802                                cpuinfo->cpu_id.machine);
803         }
804         preempt_enable();
805         return 0;
806 }
807
808 static void *c_start(struct seq_file *m, loff_t *pos)
809 {
810         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
811 }
812 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
813 {
814         ++*pos;
815         return c_start(m, pos);
816 }
817 static void c_stop(struct seq_file *m, void *v)
818 {
819 }
820 struct seq_operations cpuinfo_op = {
821         .start  = c_start,
822         .next   = c_next,
823         .stop   = c_stop,
824         .show   = show_cpuinfo,
825 };
826