[PATCH] Dynamic kernel command-line: s390
[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/uaccess.h>
45 #include <asm/system.h>
46 #include <asm/smp.h>
47 #include <asm/mmu_context.h>
48 #include <asm/cpcmd.h>
49 #include <asm/lowcore.h>
50 #include <asm/irq.h>
51 #include <asm/page.h>
52 #include <asm/ptrace.h>
53 #include <asm/sections.h>
54 #include <asm/ebcdic.h>
55 #include <asm/compat.h>
56
57 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
58                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
59 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
60                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
61                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
62
63 /*
64  * User copy operations.
65  */
66 struct uaccess_ops uaccess;
67 EXPORT_SYMBOL_GPL(uaccess);
68
69 /*
70  * Machine setup..
71  */
72 unsigned int console_mode = 0;
73 unsigned int console_devno = -1;
74 unsigned int console_irq = -1;
75 unsigned long machine_flags = 0;
76
77 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
78 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
79 static unsigned long __initdata memory_end;
80
81 /*
82  * This is set up by the setup-routine at boot-time
83  * for S390 need to find out, what we have to setup
84  * using address 0x10400 ...
85  */
86
87 #include <asm/setup.h>
88
89 static struct resource code_resource = {
90         .name  = "Kernel code",
91         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
92 };
93
94 static struct resource data_resource = {
95         .name = "Kernel data",
96         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
97 };
98
99 /*
100  * cpu_init() initializes state that is per-CPU.
101  */
102 void __devinit cpu_init (void)
103 {
104         int addr = hard_smp_processor_id();
105
106         /*
107          * Store processor id in lowcore (used e.g. in timer_interrupt)
108          */
109         asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
110         S390_lowcore.cpu_data.cpu_addr = addr;
111
112         /*
113          * Force FPU initialization:
114          */
115         clear_thread_flag(TIF_USEDFPU);
116         clear_used_math();
117
118         atomic_inc(&init_mm.mm_count);
119         current->active_mm = &init_mm;
120         if (current->mm)
121                 BUG();
122         enter_lazy_tlb(&init_mm, current);
123 }
124
125 /*
126  * VM halt and poweroff setup routines
127  */
128 char vmhalt_cmd[128] = "";
129 char vmpoff_cmd[128] = "";
130 static char vmpanic_cmd[128] = "";
131
132 static void strncpy_skip_quote(char *dst, char *src, int n)
133 {
134         int sx, dx;
135
136         dx = 0;
137         for (sx = 0; src[sx] != 0; sx++) {
138                 if (src[sx] == '"') continue;
139                 dst[dx++] = src[sx];
140                 if (dx >= n) break;
141         }
142 }
143
144 static int __init vmhalt_setup(char *str)
145 {
146         strncpy_skip_quote(vmhalt_cmd, str, 127);
147         vmhalt_cmd[127] = 0;
148         return 1;
149 }
150
151 __setup("vmhalt=", vmhalt_setup);
152
153 static int __init vmpoff_setup(char *str)
154 {
155         strncpy_skip_quote(vmpoff_cmd, str, 127);
156         vmpoff_cmd[127] = 0;
157         return 1;
158 }
159
160 __setup("vmpoff=", vmpoff_setup);
161
162 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
163                           void *data)
164 {
165         if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
166                 cpcmd(vmpanic_cmd, NULL, 0, NULL);
167
168         return NOTIFY_OK;
169 }
170
171 #define PANIC_PRI_VMPANIC       0
172
173 static struct notifier_block vmpanic_nb = {
174         .notifier_call = vmpanic_notify,
175         .priority = PANIC_PRI_VMPANIC
176 };
177
178 static int __init vmpanic_setup(char *str)
179 {
180         static int register_done __initdata = 0;
181
182         strncpy_skip_quote(vmpanic_cmd, str, 127);
183         vmpanic_cmd[127] = 0;
184         if (!register_done) {
185                 register_done = 1;
186                 atomic_notifier_chain_register(&panic_notifier_list,
187                                                &vmpanic_nb);
188         }
189         return 1;
190 }
191
192 __setup("vmpanic=", vmpanic_setup);
193
194 /*
195  * condev= and conmode= setup parameter.
196  */
197
198 static int __init condev_setup(char *str)
199 {
200         int vdev;
201
202         vdev = simple_strtoul(str, &str, 0);
203         if (vdev >= 0 && vdev < 65536) {
204                 console_devno = vdev;
205                 console_irq = -1;
206         }
207         return 1;
208 }
209
210 __setup("condev=", condev_setup);
211
212 static int __init conmode_setup(char *str)
213 {
214 #if defined(CONFIG_SCLP_CONSOLE)
215         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
216                 SET_CONSOLE_SCLP;
217 #endif
218 #if defined(CONFIG_TN3215_CONSOLE)
219         if (strncmp(str, "3215", 5) == 0)
220                 SET_CONSOLE_3215;
221 #endif
222 #if defined(CONFIG_TN3270_CONSOLE)
223         if (strncmp(str, "3270", 5) == 0)
224                 SET_CONSOLE_3270;
225 #endif
226         return 1;
227 }
228
229 __setup("conmode=", conmode_setup);
230
231 static void __init conmode_default(void)
232 {
233         char query_buffer[1024];
234         char *ptr;
235
236         if (MACHINE_IS_VM) {
237                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
238                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
239                 ptr = strstr(query_buffer, "SUBCHANNEL =");
240                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
241                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
242                 ptr = strstr(query_buffer, "CONMODE");
243                 /*
244                  * Set the conmode to 3215 so that the device recognition 
245                  * will set the cu_type of the console to 3215. If the
246                  * conmode is 3270 and we don't set it back then both
247                  * 3215 and the 3270 driver will try to access the console
248                  * device (3215 as console and 3270 as normal tty).
249                  */
250                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
251                 if (ptr == NULL) {
252 #if defined(CONFIG_SCLP_CONSOLE)
253                         SET_CONSOLE_SCLP;
254 #endif
255                         return;
256                 }
257                 if (strncmp(ptr + 8, "3270", 4) == 0) {
258 #if defined(CONFIG_TN3270_CONSOLE)
259                         SET_CONSOLE_3270;
260 #elif defined(CONFIG_TN3215_CONSOLE)
261                         SET_CONSOLE_3215;
262 #elif defined(CONFIG_SCLP_CONSOLE)
263                         SET_CONSOLE_SCLP;
264 #endif
265                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
266 #if defined(CONFIG_TN3215_CONSOLE)
267                         SET_CONSOLE_3215;
268 #elif defined(CONFIG_TN3270_CONSOLE)
269                         SET_CONSOLE_3270;
270 #elif defined(CONFIG_SCLP_CONSOLE)
271                         SET_CONSOLE_SCLP;
272 #endif
273                 }
274         } else if (MACHINE_IS_P390) {
275 #if defined(CONFIG_TN3215_CONSOLE)
276                 SET_CONSOLE_3215;
277 #elif defined(CONFIG_TN3270_CONSOLE)
278                 SET_CONSOLE_3270;
279 #endif
280         } else {
281 #if defined(CONFIG_SCLP_CONSOLE)
282                 SET_CONSOLE_SCLP;
283 #endif
284         }
285 }
286
287 #ifdef CONFIG_SMP
288 void (*_machine_restart)(char *command) = machine_restart_smp;
289 void (*_machine_halt)(void) = machine_halt_smp;
290 void (*_machine_power_off)(void) = machine_power_off_smp;
291 #else
292 /*
293  * Reboot, halt and power_off routines for non SMP.
294  */
295 static void do_machine_restart_nonsmp(char * __unused)
296 {
297         do_reipl();
298 }
299
300 static void do_machine_halt_nonsmp(void)
301 {
302         if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
303                 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
304         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
305 }
306
307 static void do_machine_power_off_nonsmp(void)
308 {
309         if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
310                 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
311         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
312 }
313
314 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
315 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
316 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
317 #endif
318
319  /*
320  * Reboot, halt and power_off stubs. They just call _machine_restart,
321  * _machine_halt or _machine_power_off. 
322  */
323
324 void machine_restart(char *command)
325 {
326         if (!in_interrupt() || oops_in_progress)
327                 /*
328                  * Only unblank the console if we are called in enabled
329                  * context or a bust_spinlocks cleared the way for us.
330                  */
331                 console_unblank();
332         _machine_restart(command);
333 }
334
335 void machine_halt(void)
336 {
337         if (!in_interrupt() || oops_in_progress)
338                 /*
339                  * Only unblank the console if we are called in enabled
340                  * context or a bust_spinlocks cleared the way for us.
341                  */
342                 console_unblank();
343         _machine_halt();
344 }
345
346 void machine_power_off(void)
347 {
348         if (!in_interrupt() || oops_in_progress)
349                 /*
350                  * Only unblank the console if we are called in enabled
351                  * context or a bust_spinlocks cleared the way for us.
352                  */
353                 console_unblank();
354         _machine_power_off();
355 }
356
357 /*
358  * Dummy power off function.
359  */
360 void (*pm_power_off)(void) = machine_power_off;
361
362 static int __init early_parse_mem(char *p)
363 {
364         memory_end = memparse(p, &p);
365         return 0;
366 }
367 early_param("mem", early_parse_mem);
368
369 /*
370  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
371  */
372 static int __init early_parse_ipldelay(char *p)
373 {
374         unsigned long delay = 0;
375
376         delay = simple_strtoul(p, &p, 0);
377
378         switch (*p) {
379         case 's':
380         case 'S':
381                 delay *= 1000000;
382                 break;
383         case 'm':
384         case 'M':
385                 delay *= 60 * 1000000;
386         }
387
388         /* now wait for the requested amount of time */
389         udelay(delay);
390
391         return 0;
392 }
393 early_param("ipldelay", early_parse_ipldelay);
394
395 #ifdef CONFIG_S390_SWITCH_AMODE
396 unsigned int switch_amode = 0;
397 EXPORT_SYMBOL_GPL(switch_amode);
398
399 static void set_amode_and_uaccess(unsigned long user_amode,
400                                   unsigned long user32_amode)
401 {
402         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
403                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
404                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
405 #ifdef CONFIG_COMPAT
406         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
407                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
408                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
409         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
410                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
411                           PSW32_MASK_PSTATE;
412 #endif
413         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
414                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
415
416         if (MACHINE_HAS_MVCOS) {
417                 printk("mvcos available.\n");
418                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
419         } else {
420                 printk("mvcos not available.\n");
421                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
422         }
423 }
424
425 /*
426  * Switch kernel/user addressing modes?
427  */
428 static int __init early_parse_switch_amode(char *p)
429 {
430         switch_amode = 1;
431         return 0;
432 }
433 early_param("switch_amode", early_parse_switch_amode);
434
435 #else /* CONFIG_S390_SWITCH_AMODE */
436 static inline void set_amode_and_uaccess(unsigned long user_amode,
437                                          unsigned long user32_amode)
438 {
439 }
440 #endif /* CONFIG_S390_SWITCH_AMODE */
441
442 #ifdef CONFIG_S390_EXEC_PROTECT
443 unsigned int s390_noexec = 0;
444 EXPORT_SYMBOL_GPL(s390_noexec);
445
446 /*
447  * Enable execute protection?
448  */
449 static int __init early_parse_noexec(char *p)
450 {
451         if (!strncmp(p, "off", 3))
452                 return 0;
453         switch_amode = 1;
454         s390_noexec = 1;
455         return 0;
456 }
457 early_param("noexec", early_parse_noexec);
458 #endif /* CONFIG_S390_EXEC_PROTECT */
459
460 static void setup_addressing_mode(void)
461 {
462         if (s390_noexec) {
463                 printk("S390 execute protection active, ");
464                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
465                 return;
466         }
467         if (switch_amode) {
468                 printk("S390 address spaces switched, ");
469                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
470         }
471 }
472
473 static void __init
474 setup_lowcore(void)
475 {
476         struct _lowcore *lc;
477         int lc_pages;
478
479         /*
480          * Setup lowcore for boot cpu
481          */
482         lc_pages = sizeof(void *) == 8 ? 2 : 1;
483         lc = (struct _lowcore *)
484                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
485         memset(lc, 0, lc_pages * PAGE_SIZE);
486         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
487         lc->restart_psw.addr =
488                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
489         if (switch_amode)
490                 lc->restart_psw.mask |= PSW_ASC_HOME;
491         lc->external_new_psw.mask = psw_kernel_bits;
492         lc->external_new_psw.addr =
493                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
494         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
495         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
496         lc->program_new_psw.mask = psw_kernel_bits;
497         lc->program_new_psw.addr =
498                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
499         lc->mcck_new_psw.mask =
500                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
501         lc->mcck_new_psw.addr =
502                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
503         lc->io_new_psw.mask = psw_kernel_bits;
504         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
505         lc->ipl_device = S390_lowcore.ipl_device;
506         lc->jiffy_timer = -1LL;
507         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
508         lc->async_stack = (unsigned long)
509                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
510         lc->panic_stack = (unsigned long)
511                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
512         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
513         lc->thread_info = (unsigned long) &init_thread_union;
514 #ifndef CONFIG_64BIT
515         if (MACHINE_HAS_IEEE) {
516                 lc->extended_save_area_addr = (__u32)
517                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
518                 /* enable extended save area */
519                 __ctl_set_bit(14, 29);
520         }
521 #endif
522         set_prefix((u32)(unsigned long) lc);
523 }
524
525 static void __init
526 setup_resources(void)
527 {
528         struct resource *res, *sub_res;
529         int i;
530
531         code_resource.start = (unsigned long) &_text;
532         code_resource.end = (unsigned long) &_etext - 1;
533         data_resource.start = (unsigned long) &_etext;
534         data_resource.end = (unsigned long) &_edata - 1;
535
536         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
537                 res = alloc_bootmem_low(sizeof(struct resource));
538                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
539                 switch (memory_chunk[i].type) {
540                 case CHUNK_READ_WRITE:
541                         res->name = "System RAM";
542                         break;
543                 case CHUNK_READ_ONLY:
544                         res->name = "System ROM";
545                         res->flags |= IORESOURCE_READONLY;
546                         break;
547                 default:
548                         res->name = "reserved";
549                 }
550                 res->start = memory_chunk[i].addr;
551                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
552                 request_resource(&iomem_resource, res);
553
554                 if (code_resource.start >= res->start  &&
555                         code_resource.start <= res->end &&
556                         code_resource.end > res->end) {
557                         sub_res = alloc_bootmem_low(sizeof(struct resource));
558                         memcpy(sub_res, &code_resource,
559                                 sizeof(struct resource));
560                         sub_res->end = res->end;
561                         code_resource.start = res->end + 1;
562                         request_resource(res, sub_res);
563                 }
564
565                 if (code_resource.start >= res->start &&
566                         code_resource.start <= res->end &&
567                         code_resource.end <= res->end)
568                         request_resource(res, &code_resource);
569
570                 if (data_resource.start >= res->start &&
571                         data_resource.start <= res->end &&
572                         data_resource.end > res->end) {
573                         sub_res = alloc_bootmem_low(sizeof(struct resource));
574                         memcpy(sub_res, &data_resource,
575                                 sizeof(struct resource));
576                         sub_res->end = res->end;
577                         data_resource.start = res->end + 1;
578                         request_resource(res, sub_res);
579                 }
580
581                 if (data_resource.start >= res->start &&
582                         data_resource.start <= res->end &&
583                         data_resource.end <= res->end)
584                         request_resource(res, &data_resource);
585         }
586 }
587
588 static void __init setup_memory_end(void)
589 {
590         unsigned long real_size, memory_size;
591         unsigned long max_mem, max_phys;
592         int i;
593
594         memory_size = real_size = 0;
595         max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
596         memory_end &= PAGE_MASK;
597
598         max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
599
600         for (i = 0; i < MEMORY_CHUNKS; i++) {
601                 struct mem_chunk *chunk = &memory_chunk[i];
602
603                 real_size = max(real_size, chunk->addr + chunk->size);
604                 if (chunk->addr >= max_mem) {
605                         memset(chunk, 0, sizeof(*chunk));
606                         continue;
607                 }
608                 if (chunk->addr + chunk->size > max_mem)
609                         chunk->size = max_mem - chunk->addr;
610                 memory_size = max(memory_size, chunk->addr + chunk->size);
611         }
612         if (!memory_end)
613                 memory_end = memory_size;
614 }
615
616 static void __init
617 setup_memory(void)
618 {
619         unsigned long bootmap_size;
620         unsigned long start_pfn, end_pfn;
621         int i;
622
623         /*
624          * partially used pages are not usable - thus
625          * we are rounding upwards:
626          */
627         start_pfn = PFN_UP(__pa(&_end));
628         end_pfn = max_pfn = PFN_DOWN(memory_end);
629
630 #ifdef CONFIG_BLK_DEV_INITRD
631         /*
632          * Move the initrd in case the bitmap of the bootmem allocater
633          * would overwrite it.
634          */
635
636         if (INITRD_START && INITRD_SIZE) {
637                 unsigned long bmap_size;
638                 unsigned long start;
639
640                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
641                 bmap_size = PFN_PHYS(bmap_size);
642
643                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
644                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
645
646                         if (start + INITRD_SIZE > memory_end) {
647                                 printk("initrd extends beyond end of memory "
648                                        "(0x%08lx > 0x%08lx)\n"
649                                        "disabling initrd\n",
650                                        start + INITRD_SIZE, memory_end);
651                                 INITRD_START = INITRD_SIZE = 0;
652                         } else {
653                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
654                                        "size: %ld)\n",
655                                        INITRD_START, start, INITRD_SIZE);
656                                 memmove((void *) start, (void *) INITRD_START,
657                                         INITRD_SIZE);
658                                 INITRD_START = start;
659                         }
660                 }
661         }
662 #endif
663
664         /*
665          * Initialize the boot-time allocator
666          */
667         bootmap_size = init_bootmem(start_pfn, end_pfn);
668
669         /*
670          * Register RAM areas with the bootmem allocator.
671          */
672
673         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
674                 unsigned long start_chunk, end_chunk, pfn;
675
676                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
677                         continue;
678                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
679                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
680                 end_chunk = min(end_chunk, end_pfn);
681                 if (start_chunk >= end_chunk)
682                         continue;
683                 add_active_range(0, start_chunk, end_chunk);
684                 pfn = max(start_chunk, start_pfn);
685                 for (; pfn <= end_chunk; pfn++)
686                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
687         }
688
689         psw_set_key(PAGE_DEFAULT_KEY);
690
691         free_bootmem_with_active_regions(0, max_pfn);
692         reserve_bootmem(0, PFN_PHYS(start_pfn));
693
694         /*
695          * Reserve the bootmem bitmap itself as well. We do this in two
696          * steps (first step was init_bootmem()) because this catches
697          * the (very unlikely) case of us accidentally initializing the
698          * bootmem allocator with an invalid RAM area.
699          */
700         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
701
702 #ifdef CONFIG_BLK_DEV_INITRD
703         if (INITRD_START && INITRD_SIZE) {
704                 if (INITRD_START + INITRD_SIZE <= memory_end) {
705                         reserve_bootmem(INITRD_START, INITRD_SIZE);
706                         initrd_start = INITRD_START;
707                         initrd_end = initrd_start + INITRD_SIZE;
708                 } else {
709                         printk("initrd extends beyond end of memory "
710                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
711                                initrd_start + INITRD_SIZE, memory_end);
712                         initrd_start = initrd_end = 0;
713                 }
714         }
715 #endif
716 }
717
718 /*
719  * Setup function called from init/main.c just after the banner
720  * was printed.
721  */
722
723 void __init
724 setup_arch(char **cmdline_p)
725 {
726         /*
727          * print what head.S has found out about the machine
728          */
729 #ifndef CONFIG_64BIT
730         printk((MACHINE_IS_VM) ?
731                "We are running under VM (31 bit mode)\n" :
732                "We are running native (31 bit mode)\n");
733         printk((MACHINE_HAS_IEEE) ?
734                "This machine has an IEEE fpu\n" :
735                "This machine has no IEEE fpu\n");
736 #else /* CONFIG_64BIT */
737         printk((MACHINE_IS_VM) ?
738                "We are running under VM (64 bit mode)\n" :
739                "We are running native (64 bit mode)\n");
740 #endif /* CONFIG_64BIT */
741
742         /* Save unparsed command line copy for /proc/cmdline */
743         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
744
745         *cmdline_p = COMMAND_LINE;
746         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
747
748         ROOT_DEV = Root_RAM0;
749
750         init_mm.start_code = PAGE_OFFSET;
751         init_mm.end_code = (unsigned long) &_etext;
752         init_mm.end_data = (unsigned long) &_edata;
753         init_mm.brk = (unsigned long) &_end;
754
755         if (MACHINE_HAS_MVCOS)
756                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
757         else
758                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
759
760         parse_early_param();
761
762         setup_memory_end();
763         setup_addressing_mode();
764         setup_memory();
765         setup_resources();
766         setup_lowcore();
767
768         cpu_init();
769         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
770         smp_setup_cpu_possible_map();
771
772         /*
773          * Create kernel page tables and switch to virtual addressing.
774          */
775         paging_init();
776
777         /* Setup default console */
778         conmode_default();
779 }
780
781 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
782 {
783    printk("cpu %d "
784 #ifdef CONFIG_SMP
785            "phys_idx=%d "
786 #endif
787            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
788            cpuinfo->cpu_nr,
789 #ifdef CONFIG_SMP
790            cpuinfo->cpu_addr,
791 #endif
792            cpuinfo->cpu_id.version,
793            cpuinfo->cpu_id.ident,
794            cpuinfo->cpu_id.machine,
795            cpuinfo->cpu_id.unused);
796 }
797
798 /*
799  * show_cpuinfo - Get information on one CPU for use by procfs.
800  */
801
802 static int show_cpuinfo(struct seq_file *m, void *v)
803 {
804         struct cpuinfo_S390 *cpuinfo;
805         unsigned long n = (unsigned long) v - 1;
806
807         s390_adjust_jiffies();
808         preempt_disable();
809         if (!n) {
810                 seq_printf(m, "vendor_id       : IBM/S390\n"
811                                "# processors    : %i\n"
812                                "bogomips per cpu: %lu.%02lu\n",
813                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
814                                (loops_per_jiffy/(5000/HZ))%100);
815         }
816         if (cpu_online(n)) {
817 #ifdef CONFIG_SMP
818                 if (smp_processor_id() == n)
819                         cpuinfo = &S390_lowcore.cpu_data;
820                 else
821                         cpuinfo = &lowcore_ptr[n]->cpu_data;
822 #else
823                 cpuinfo = &S390_lowcore.cpu_data;
824 #endif
825                 seq_printf(m, "processor %li: "
826                                "version = %02X,  "
827                                "identification = %06X,  "
828                                "machine = %04X\n",
829                                n, cpuinfo->cpu_id.version,
830                                cpuinfo->cpu_id.ident,
831                                cpuinfo->cpu_id.machine);
832         }
833         preempt_enable();
834         return 0;
835 }
836
837 static void *c_start(struct seq_file *m, loff_t *pos)
838 {
839         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
840 }
841 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
842 {
843         ++*pos;
844         return c_start(m, pos);
845 }
846 static void c_stop(struct seq_file *m, void *v)
847 {
848 }
849 struct seq_operations cpuinfo_op = {
850         .start  = c_start,
851         .next   = c_next,
852         .stop   = c_stop,
853         .show   = show_cpuinfo,
854 };
855