]> err.no Git - linux-2.6/blob - arch/s390/kernel/setup.c
Merge branches 'release' and 'hp-cid' into release
[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/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(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 unsigned long elf_hwcap = 0;
78 char elf_platform[ELF_PLATFORM_SIZE];
79
80 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS];
81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
82 static unsigned long __initdata memory_end;
83
84 /*
85  * This is set up by the setup-routine at boot-time
86  * for S390 need to find out, what we have to setup
87  * using address 0x10400 ...
88  */
89
90 #include <asm/setup.h>
91
92 static struct resource code_resource = {
93         .name  = "Kernel code",
94         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
95 };
96
97 static struct resource data_resource = {
98         .name = "Kernel data",
99         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
100 };
101
102 /*
103  * cpu_init() initializes state that is per-CPU.
104  */
105 void __cpuinit cpu_init(void)
106 {
107         int addr = hard_smp_processor_id();
108
109         /*
110          * Store processor id in lowcore (used e.g. in timer_interrupt)
111          */
112         get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
113         S390_lowcore.cpu_data.cpu_addr = addr;
114
115         /*
116          * Force FPU initialization:
117          */
118         clear_thread_flag(TIF_USEDFPU);
119         clear_used_math();
120
121         atomic_inc(&init_mm.mm_count);
122         current->active_mm = &init_mm;
123         if (current->mm)
124                 BUG();
125         enter_lazy_tlb(&init_mm, current);
126 }
127
128 /*
129  * condev= and conmode= setup parameter.
130  */
131
132 static int __init condev_setup(char *str)
133 {
134         int vdev;
135
136         vdev = simple_strtoul(str, &str, 0);
137         if (vdev >= 0 && vdev < 65536) {
138                 console_devno = vdev;
139                 console_irq = -1;
140         }
141         return 1;
142 }
143
144 __setup("condev=", condev_setup);
145
146 static int __init conmode_setup(char *str)
147 {
148 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
149         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
150                 SET_CONSOLE_SCLP;
151 #endif
152 #if defined(CONFIG_TN3215_CONSOLE)
153         if (strncmp(str, "3215", 5) == 0)
154                 SET_CONSOLE_3215;
155 #endif
156 #if defined(CONFIG_TN3270_CONSOLE)
157         if (strncmp(str, "3270", 5) == 0)
158                 SET_CONSOLE_3270;
159 #endif
160         return 1;
161 }
162
163 __setup("conmode=", conmode_setup);
164
165 static void __init conmode_default(void)
166 {
167         char query_buffer[1024];
168         char *ptr;
169
170         if (MACHINE_IS_VM) {
171                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
172                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
173                 ptr = strstr(query_buffer, "SUBCHANNEL =");
174                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
175                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
176                 ptr = strstr(query_buffer, "CONMODE");
177                 /*
178                  * Set the conmode to 3215 so that the device recognition 
179                  * will set the cu_type of the console to 3215. If the
180                  * conmode is 3270 and we don't set it back then both
181                  * 3215 and the 3270 driver will try to access the console
182                  * device (3215 as console and 3270 as normal tty).
183                  */
184                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
185                 if (ptr == NULL) {
186 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
187                         SET_CONSOLE_SCLP;
188 #endif
189                         return;
190                 }
191                 if (strncmp(ptr + 8, "3270", 4) == 0) {
192 #if defined(CONFIG_TN3270_CONSOLE)
193                         SET_CONSOLE_3270;
194 #elif defined(CONFIG_TN3215_CONSOLE)
195                         SET_CONSOLE_3215;
196 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
197                         SET_CONSOLE_SCLP;
198 #endif
199                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
200 #if defined(CONFIG_TN3215_CONSOLE)
201                         SET_CONSOLE_3215;
202 #elif defined(CONFIG_TN3270_CONSOLE)
203                         SET_CONSOLE_3270;
204 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
205                         SET_CONSOLE_SCLP;
206 #endif
207                 }
208         } else if (MACHINE_IS_P390) {
209 #if defined(CONFIG_TN3215_CONSOLE)
210                 SET_CONSOLE_3215;
211 #elif defined(CONFIG_TN3270_CONSOLE)
212                 SET_CONSOLE_3270;
213 #endif
214         } else {
215 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216                 SET_CONSOLE_SCLP;
217 #endif
218         }
219 }
220
221 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
222 static void __init setup_zfcpdump(unsigned int console_devno)
223 {
224         static char str[64];
225
226         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
227                 return;
228         if (console_devno != -1)
229                 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
230                         ipl_info.data.fcp.dev_id.devno, console_devno);
231         else
232                 sprintf(str, "cio_ignore=all,!0.0.%04x",
233                         ipl_info.data.fcp.dev_id.devno);
234         strcat(COMMAND_LINE, " ");
235         strcat(COMMAND_LINE, str);
236         console_loglevel = 2;
237 }
238 #else
239 static inline void setup_zfcpdump(unsigned int console_devno) {}
240 #endif /* CONFIG_ZFCPDUMP */
241
242  /*
243  * Reboot, halt and power_off stubs. They just call _machine_restart,
244  * _machine_halt or _machine_power_off. 
245  */
246
247 void machine_restart(char *command)
248 {
249         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
250                 /*
251                  * Only unblank the console if we are called in enabled
252                  * context or a bust_spinlocks cleared the way for us.
253                  */
254                 console_unblank();
255         _machine_restart(command);
256 }
257
258 void machine_halt(void)
259 {
260         if (!in_interrupt() || oops_in_progress)
261                 /*
262                  * Only unblank the console if we are called in enabled
263                  * context or a bust_spinlocks cleared the way for us.
264                  */
265                 console_unblank();
266         _machine_halt();
267 }
268
269 void machine_power_off(void)
270 {
271         if (!in_interrupt() || oops_in_progress)
272                 /*
273                  * Only unblank the console if we are called in enabled
274                  * context or a bust_spinlocks cleared the way for us.
275                  */
276                 console_unblank();
277         _machine_power_off();
278 }
279
280 /*
281  * Dummy power off function.
282  */
283 void (*pm_power_off)(void) = machine_power_off;
284
285 static int __init early_parse_mem(char *p)
286 {
287         memory_end = memparse(p, &p);
288         return 0;
289 }
290 early_param("mem", early_parse_mem);
291
292 /*
293  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
294  */
295 static int __init early_parse_ipldelay(char *p)
296 {
297         unsigned long delay = 0;
298
299         delay = simple_strtoul(p, &p, 0);
300
301         switch (*p) {
302         case 's':
303         case 'S':
304                 delay *= 1000000;
305                 break;
306         case 'm':
307         case 'M':
308                 delay *= 60 * 1000000;
309         }
310
311         /* now wait for the requested amount of time */
312         udelay(delay);
313
314         return 0;
315 }
316 early_param("ipldelay", early_parse_ipldelay);
317
318 #ifdef CONFIG_S390_SWITCH_AMODE
319 unsigned int switch_amode = 0;
320 EXPORT_SYMBOL_GPL(switch_amode);
321
322 static void set_amode_and_uaccess(unsigned long user_amode,
323                                   unsigned long user32_amode)
324 {
325         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
326                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
327                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
328 #ifdef CONFIG_COMPAT
329         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
330                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
331                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
332         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
333                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
334                           PSW32_MASK_PSTATE;
335 #endif
336         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
337                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
338
339         if (MACHINE_HAS_MVCOS) {
340                 printk("mvcos available.\n");
341                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
342         } else {
343                 printk("mvcos not available.\n");
344                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
345         }
346 }
347
348 /*
349  * Switch kernel/user addressing modes?
350  */
351 static int __init early_parse_switch_amode(char *p)
352 {
353         switch_amode = 1;
354         return 0;
355 }
356 early_param("switch_amode", early_parse_switch_amode);
357
358 #else /* CONFIG_S390_SWITCH_AMODE */
359 static inline void set_amode_and_uaccess(unsigned long user_amode,
360                                          unsigned long user32_amode)
361 {
362 }
363 #endif /* CONFIG_S390_SWITCH_AMODE */
364
365 #ifdef CONFIG_S390_EXEC_PROTECT
366 unsigned int s390_noexec = 0;
367 EXPORT_SYMBOL_GPL(s390_noexec);
368
369 /*
370  * Enable execute protection?
371  */
372 static int __init early_parse_noexec(char *p)
373 {
374         if (!strncmp(p, "off", 3))
375                 return 0;
376         switch_amode = 1;
377         s390_noexec = 1;
378         return 0;
379 }
380 early_param("noexec", early_parse_noexec);
381 #endif /* CONFIG_S390_EXEC_PROTECT */
382
383 static void setup_addressing_mode(void)
384 {
385         if (s390_noexec) {
386                 printk("S390 execute protection active, ");
387                 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
388         } else if (switch_amode) {
389                 printk("S390 address spaces switched, ");
390                 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
391         }
392 #ifdef CONFIG_TRACE_IRQFLAGS
393         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
394         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
395 #endif
396 }
397
398 static void __init
399 setup_lowcore(void)
400 {
401         struct _lowcore *lc;
402         int lc_pages;
403
404         /*
405          * Setup lowcore for boot cpu
406          */
407         lc_pages = sizeof(void *) == 8 ? 2 : 1;
408         lc = (struct _lowcore *)
409                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
410         memset(lc, 0, lc_pages * PAGE_SIZE);
411         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
412         lc->restart_psw.addr =
413                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
414         if (switch_amode)
415                 lc->restart_psw.mask |= PSW_ASC_HOME;
416         lc->external_new_psw.mask = psw_kernel_bits;
417         lc->external_new_psw.addr =
418                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
419         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
420         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
421         lc->program_new_psw.mask = psw_kernel_bits;
422         lc->program_new_psw.addr =
423                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
424         lc->mcck_new_psw.mask =
425                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
426         lc->mcck_new_psw.addr =
427                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
428         lc->io_new_psw.mask = psw_kernel_bits;
429         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
430         lc->ipl_device = S390_lowcore.ipl_device;
431         lc->jiffy_timer = -1LL;
432         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
433         lc->async_stack = (unsigned long)
434                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
435         lc->panic_stack = (unsigned long)
436                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
437         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
438         lc->thread_info = (unsigned long) &init_thread_union;
439 #ifndef CONFIG_64BIT
440         if (MACHINE_HAS_IEEE) {
441                 lc->extended_save_area_addr = (__u32)
442                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
443                 /* enable extended save area */
444                 __ctl_set_bit(14, 29);
445         }
446 #endif
447         set_prefix((u32)(unsigned long) lc);
448 }
449
450 static void __init
451 setup_resources(void)
452 {
453         struct resource *res, *sub_res;
454         int i;
455
456         code_resource.start = (unsigned long) &_text;
457         code_resource.end = (unsigned long) &_etext - 1;
458         data_resource.start = (unsigned long) &_etext;
459         data_resource.end = (unsigned long) &_edata - 1;
460
461         for (i = 0; i < MEMORY_CHUNKS; i++) {
462                 if (!memory_chunk[i].size)
463                         continue;
464                 res = alloc_bootmem_low(sizeof(struct resource));
465                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
466                 switch (memory_chunk[i].type) {
467                 case CHUNK_READ_WRITE:
468                         res->name = "System RAM";
469                         break;
470                 case CHUNK_READ_ONLY:
471                         res->name = "System ROM";
472                         res->flags |= IORESOURCE_READONLY;
473                         break;
474                 default:
475                         res->name = "reserved";
476                 }
477                 res->start = memory_chunk[i].addr;
478                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
479                 request_resource(&iomem_resource, res);
480
481                 if (code_resource.start >= res->start  &&
482                         code_resource.start <= res->end &&
483                         code_resource.end > res->end) {
484                         sub_res = alloc_bootmem_low(sizeof(struct resource));
485                         memcpy(sub_res, &code_resource,
486                                 sizeof(struct resource));
487                         sub_res->end = res->end;
488                         code_resource.start = res->end + 1;
489                         request_resource(res, sub_res);
490                 }
491
492                 if (code_resource.start >= res->start &&
493                         code_resource.start <= res->end &&
494                         code_resource.end <= res->end)
495                         request_resource(res, &code_resource);
496
497                 if (data_resource.start >= res->start &&
498                         data_resource.start <= res->end &&
499                         data_resource.end > res->end) {
500                         sub_res = alloc_bootmem_low(sizeof(struct resource));
501                         memcpy(sub_res, &data_resource,
502                                 sizeof(struct resource));
503                         sub_res->end = res->end;
504                         data_resource.start = res->end + 1;
505                         request_resource(res, sub_res);
506                 }
507
508                 if (data_resource.start >= res->start &&
509                         data_resource.start <= res->end &&
510                         data_resource.end <= res->end)
511                         request_resource(res, &data_resource);
512         }
513 }
514
515 unsigned long real_memory_size;
516 EXPORT_SYMBOL_GPL(real_memory_size);
517
518 static void __init setup_memory_end(void)
519 {
520         unsigned long memory_size;
521         unsigned long max_mem;
522         int i;
523
524 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
525         if (ipl_info.type == IPL_TYPE_FCP_DUMP)
526                 memory_end = ZFCPDUMP_HSA_SIZE;
527 #endif
528         memory_size = 0;
529         memory_end &= PAGE_MASK;
530
531         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
532         memory_end = min(max_mem, memory_end);
533
534         /*
535          * Make sure all chunks are MAX_ORDER aligned so we don't need the
536          * extra checks that HOLES_IN_ZONE would require.
537          */
538         for (i = 0; i < MEMORY_CHUNKS; i++) {
539                 unsigned long start, end;
540                 struct mem_chunk *chunk;
541                 unsigned long align;
542
543                 chunk = &memory_chunk[i];
544                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
545                 start = (chunk->addr + align - 1) & ~(align - 1);
546                 end = (chunk->addr + chunk->size) & ~(align - 1);
547                 if (start >= end)
548                         memset(chunk, 0, sizeof(*chunk));
549                 else {
550                         chunk->addr = start;
551                         chunk->size = end - start;
552                 }
553         }
554
555         for (i = 0; i < MEMORY_CHUNKS; i++) {
556                 struct mem_chunk *chunk = &memory_chunk[i];
557
558                 real_memory_size = max(real_memory_size,
559                                        chunk->addr + chunk->size);
560                 if (chunk->addr >= max_mem) {
561                         memset(chunk, 0, sizeof(*chunk));
562                         continue;
563                 }
564                 if (chunk->addr + chunk->size > max_mem)
565                         chunk->size = max_mem - chunk->addr;
566                 memory_size = max(memory_size, chunk->addr + chunk->size);
567         }
568         if (!memory_end)
569                 memory_end = memory_size;
570 }
571
572 static void __init
573 setup_memory(void)
574 {
575         unsigned long bootmap_size;
576         unsigned long start_pfn, end_pfn;
577         int i;
578
579         /*
580          * partially used pages are not usable - thus
581          * we are rounding upwards:
582          */
583         start_pfn = PFN_UP(__pa(&_end));
584         end_pfn = max_pfn = PFN_DOWN(memory_end);
585
586 #ifdef CONFIG_BLK_DEV_INITRD
587         /*
588          * Move the initrd in case the bitmap of the bootmem allocater
589          * would overwrite it.
590          */
591
592         if (INITRD_START && INITRD_SIZE) {
593                 unsigned long bmap_size;
594                 unsigned long start;
595
596                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
597                 bmap_size = PFN_PHYS(bmap_size);
598
599                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
600                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
601
602                         if (start + INITRD_SIZE > memory_end) {
603                                 printk("initrd extends beyond end of memory "
604                                        "(0x%08lx > 0x%08lx)\n"
605                                        "disabling initrd\n",
606                                        start + INITRD_SIZE, memory_end);
607                                 INITRD_START = INITRD_SIZE = 0;
608                         } else {
609                                 printk("Moving initrd (0x%08lx -> 0x%08lx, "
610                                        "size: %ld)\n",
611                                        INITRD_START, start, INITRD_SIZE);
612                                 memmove((void *) start, (void *) INITRD_START,
613                                         INITRD_SIZE);
614                                 INITRD_START = start;
615                         }
616                 }
617         }
618 #endif
619
620         /*
621          * Initialize the boot-time allocator
622          */
623         bootmap_size = init_bootmem(start_pfn, end_pfn);
624
625         /*
626          * Register RAM areas with the bootmem allocator.
627          */
628
629         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
630                 unsigned long start_chunk, end_chunk, pfn;
631
632                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
633                         continue;
634                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
635                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
636                 end_chunk = min(end_chunk, end_pfn);
637                 if (start_chunk >= end_chunk)
638                         continue;
639                 add_active_range(0, start_chunk, end_chunk);
640                 pfn = max(start_chunk, start_pfn);
641                 for (; pfn <= end_chunk; pfn++)
642                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
643         }
644
645         psw_set_key(PAGE_DEFAULT_KEY);
646
647         free_bootmem_with_active_regions(0, max_pfn);
648
649         /*
650          * Reserve memory used for lowcore/command line/kernel image.
651          */
652         reserve_bootmem(0, (unsigned long)_ehead);
653         reserve_bootmem((unsigned long)_stext,
654                         PFN_PHYS(start_pfn) - (unsigned long)_stext);
655         /*
656          * Reserve the bootmem bitmap itself as well. We do this in two
657          * steps (first step was init_bootmem()) because this catches
658          * the (very unlikely) case of us accidentally initializing the
659          * bootmem allocator with an invalid RAM area.
660          */
661         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
662
663 #ifdef CONFIG_BLK_DEV_INITRD
664         if (INITRD_START && INITRD_SIZE) {
665                 if (INITRD_START + INITRD_SIZE <= memory_end) {
666                         reserve_bootmem(INITRD_START, INITRD_SIZE);
667                         initrd_start = INITRD_START;
668                         initrd_end = initrd_start + INITRD_SIZE;
669                 } else {
670                         printk("initrd extends beyond end of memory "
671                                "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
672                                initrd_start + INITRD_SIZE, memory_end);
673                         initrd_start = initrd_end = 0;
674                 }
675         }
676 #endif
677 }
678
679 static __init unsigned int stfl(void)
680 {
681         asm volatile(
682                 "       .insn   s,0xb2b10000,0(0)\n" /* stfl */
683                 "0:\n"
684                 EX_TABLE(0b,0b));
685         return S390_lowcore.stfl_fac_list;
686 }
687
688 static __init int stfle(unsigned long long *list, int doublewords)
689 {
690         typedef struct { unsigned long long _[doublewords]; } addrtype;
691         register unsigned long __nr asm("0") = doublewords - 1;
692
693         asm volatile(".insn s,0xb2b00000,%0" /* stfle */
694                      : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
695         return __nr + 1;
696 }
697
698 /*
699  * Setup hardware capabilities.
700  */
701 static void __init setup_hwcaps(void)
702 {
703         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
704         struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
705         unsigned long long facility_list_extended;
706         unsigned int facility_list;
707         int i;
708
709         facility_list = stfl();
710         /*
711          * The store facility list bits numbers as found in the principles
712          * of operation are numbered with bit 1UL<<31 as number 0 to
713          * bit 1UL<<0 as number 31.
714          *   Bit 0: instructions named N3, "backported" to esa-mode
715          *   Bit 2: z/Architecture mode is active
716          *   Bit 7: the store-facility-list-extended facility is installed
717          *   Bit 17: the message-security assist is installed
718          *   Bit 19: the long-displacement facility is installed
719          *   Bit 21: the extended-immediate facility is installed
720          * These get translated to:
721          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
722          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
723          *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
724          */
725         for (i = 0; i < 6; i++)
726                 if (facility_list & (1UL << (31 - stfl_bits[i])))
727                         elf_hwcap |= 1UL << i;
728
729         /*
730          * Check for additional facilities with store-facility-list-extended.
731          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
732          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
733          * as stored by stfl, bits 32-xxx contain additional facilities.
734          * How many facility words are stored depends on the number of
735          * doublewords passed to the instruction. The additional facilites
736          * are:
737          *   Bit 43: decimal floating point facility is installed
738          * translated to:
739          *   HWCAP_S390_DFP bit 6.
740          */
741         if ((elf_hwcap & (1UL << 2)) &&
742             stfle(&facility_list_extended, 1) > 0) {
743                 if (facility_list_extended & (1ULL << (64 - 43)))
744                         elf_hwcap |= 1UL << 6;
745         }
746
747         switch (cpuinfo->cpu_id.machine) {
748         case 0x9672:
749 #if !defined(CONFIG_64BIT)
750         default:        /* Use "g5" as default for 31 bit kernels. */
751 #endif
752                 strcpy(elf_platform, "g5");
753                 break;
754         case 0x2064:
755         case 0x2066:
756 #if defined(CONFIG_64BIT)
757         default:        /* Use "z900" as default for 64 bit kernels. */
758 #endif
759                 strcpy(elf_platform, "z900");
760                 break;
761         case 0x2084:
762         case 0x2086:
763                 strcpy(elf_platform, "z990");
764                 break;
765         case 0x2094:
766                 strcpy(elf_platform, "z9-109");
767                 break;
768         }
769 }
770
771 /*
772  * Setup function called from init/main.c just after the banner
773  * was printed.
774  */
775
776 void __init
777 setup_arch(char **cmdline_p)
778 {
779         /*
780          * print what head.S has found out about the machine
781          */
782 #ifndef CONFIG_64BIT
783         printk((MACHINE_IS_VM) ?
784                "We are running under VM (31 bit mode)\n" :
785                "We are running native (31 bit mode)\n");
786         printk((MACHINE_HAS_IEEE) ?
787                "This machine has an IEEE fpu\n" :
788                "This machine has no IEEE fpu\n");
789 #else /* CONFIG_64BIT */
790         printk((MACHINE_IS_VM) ?
791                "We are running under VM (64 bit mode)\n" :
792                "We are running native (64 bit mode)\n");
793 #endif /* CONFIG_64BIT */
794
795         /* Save unparsed command line copy for /proc/cmdline */
796         strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
797
798         *cmdline_p = COMMAND_LINE;
799         *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
800
801         ROOT_DEV = Root_RAM0;
802
803         init_mm.start_code = PAGE_OFFSET;
804         init_mm.end_code = (unsigned long) &_etext;
805         init_mm.end_data = (unsigned long) &_edata;
806         init_mm.brk = (unsigned long) &_end;
807
808         if (MACHINE_HAS_MVCOS)
809                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
810         else
811                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
812
813         parse_early_param();
814
815         setup_ipl();
816         setup_memory_end();
817         setup_addressing_mode();
818         setup_memory();
819         setup_resources();
820         setup_lowcore();
821
822         cpu_init();
823         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
824
825         /*
826          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
827          */
828         setup_hwcaps();
829
830         /*
831          * Create kernel page tables and switch to virtual addressing.
832          */
833         paging_init();
834
835         /* Setup default console */
836         conmode_default();
837
838         /* Setup zfcpdump support */
839         setup_zfcpdump(console_devno);
840 }
841
842 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
843 {
844    printk(KERN_INFO "cpu %d "
845 #ifdef CONFIG_SMP
846            "phys_idx=%d "
847 #endif
848            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
849            cpuinfo->cpu_nr,
850 #ifdef CONFIG_SMP
851            cpuinfo->cpu_addr,
852 #endif
853            cpuinfo->cpu_id.version,
854            cpuinfo->cpu_id.ident,
855            cpuinfo->cpu_id.machine,
856            cpuinfo->cpu_id.unused);
857 }
858
859 /*
860  * show_cpuinfo - Get information on one CPU for use by procfs.
861  */
862
863 static int show_cpuinfo(struct seq_file *m, void *v)
864 {
865         static const char *hwcap_str[7] = {
866                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
867         };
868         struct cpuinfo_S390 *cpuinfo;
869         unsigned long n = (unsigned long) v - 1;
870         int i;
871
872         s390_adjust_jiffies();
873         preempt_disable();
874         if (!n) {
875                 seq_printf(m, "vendor_id       : IBM/S390\n"
876                                "# processors    : %i\n"
877                                "bogomips per cpu: %lu.%02lu\n",
878                                num_online_cpus(), loops_per_jiffy/(500000/HZ),
879                                (loops_per_jiffy/(5000/HZ))%100);
880                 seq_puts(m, "features\t: ");
881                 for (i = 0; i < 7; i++)
882                         if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
883                                 seq_printf(m, "%s ", hwcap_str[i]);
884                 seq_puts(m, "\n");
885         }
886
887         if (cpu_online(n)) {
888 #ifdef CONFIG_SMP
889                 if (smp_processor_id() == n)
890                         cpuinfo = &S390_lowcore.cpu_data;
891                 else
892                         cpuinfo = &lowcore_ptr[n]->cpu_data;
893 #else
894                 cpuinfo = &S390_lowcore.cpu_data;
895 #endif
896                 seq_printf(m, "processor %li: "
897                                "version = %02X,  "
898                                "identification = %06X,  "
899                                "machine = %04X\n",
900                                n, cpuinfo->cpu_id.version,
901                                cpuinfo->cpu_id.ident,
902                                cpuinfo->cpu_id.machine);
903         }
904         preempt_enable();
905         return 0;
906 }
907
908 static void *c_start(struct seq_file *m, loff_t *pos)
909 {
910         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
911 }
912 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
913 {
914         ++*pos;
915         return c_start(m, pos);
916 }
917 static void c_stop(struct seq_file *m, void *v)
918 {
919 }
920 const struct seq_operations cpuinfo_op = {
921         .start  = c_start,
922         .next   = c_next,
923         .stop   = c_stop,
924         .show   = show_cpuinfo,
925 };
926