[S390] Add hwcap flag for the etf3 enhancement facility
[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 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/stddef.h>
26 #include <linux/unistd.h>
27 #include <linux/ptrace.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/tty.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/initrd.h>
35 #include <linux/bootmem.h>
36 #include <linux/root_dev.h>
37 #include <linux/console.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/device.h>
40 #include <linux/notifier.h>
41 #include <linux/pfn.h>
42 #include <linux/ctype.h>
43 #include <linux/reboot.h>
44 #include <linux/topology.h>
45
46 #include <asm/ipl.h>
47 #include <asm/uaccess.h>
48 #include <asm/system.h>
49 #include <asm/smp.h>
50 #include <asm/mmu_context.h>
51 #include <asm/cpcmd.h>
52 #include <asm/lowcore.h>
53 #include <asm/irq.h>
54 #include <asm/page.h>
55 #include <asm/ptrace.h>
56 #include <asm/sections.h>
57 #include <asm/ebcdic.h>
58 #include <asm/compat.h>
59 #include <asm/kvm_virtio.h>
60
61 long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
62                            PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
63 long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64                            PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65                            PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66
67 /*
68  * User copy operations.
69  */
70 struct uaccess_ops uaccess;
71 EXPORT_SYMBOL(uaccess);
72
73 /*
74  * Machine setup..
75  */
76 unsigned int console_mode = 0;
77 EXPORT_SYMBOL(console_mode);
78
79 unsigned int console_devno = -1;
80 EXPORT_SYMBOL(console_devno);
81
82 unsigned int console_irq = -1;
83 EXPORT_SYMBOL(console_irq);
84
85 unsigned long machine_flags;
86 EXPORT_SYMBOL(machine_flags);
87
88 unsigned long elf_hwcap = 0;
89 char elf_platform[ELF_PLATFORM_SIZE];
90
91 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
92 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
93
94 int __initdata memory_end_set;
95 unsigned long __initdata memory_end;
96
97 /* An array with a pointer to the lowcore of every CPU. */
98 struct _lowcore *lowcore_ptr[NR_CPUS];
99 EXPORT_SYMBOL(lowcore_ptr);
100
101 /*
102  * This is set up by the setup-routine at boot-time
103  * for S390 need to find out, what we have to setup
104  * using address 0x10400 ...
105  */
106
107 #include <asm/setup.h>
108
109 static struct resource code_resource = {
110         .name  = "Kernel code",
111         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
112 };
113
114 static struct resource data_resource = {
115         .name = "Kernel data",
116         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
117 };
118
119 /*
120  * cpu_init() initializes state that is per-CPU.
121  */
122 void __cpuinit cpu_init(void)
123 {
124         /*
125          * Store processor id in lowcore (used e.g. in timer_interrupt)
126          */
127         get_cpu_id(&S390_lowcore.cpu_id);
128
129         /*
130          * Force FPU initialization:
131          */
132         clear_thread_flag(TIF_USEDFPU);
133         clear_used_math();
134
135         atomic_inc(&init_mm.mm_count);
136         current->active_mm = &init_mm;
137         BUG_ON(current->mm);
138         enter_lazy_tlb(&init_mm, current);
139 }
140
141 /*
142  * condev= and conmode= setup parameter.
143  */
144
145 static int __init condev_setup(char *str)
146 {
147         int vdev;
148
149         vdev = simple_strtoul(str, &str, 0);
150         if (vdev >= 0 && vdev < 65536) {
151                 console_devno = vdev;
152                 console_irq = -1;
153         }
154         return 1;
155 }
156
157 __setup("condev=", condev_setup);
158
159 static int __init conmode_setup(char *str)
160 {
161 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
162         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
163                 SET_CONSOLE_SCLP;
164 #endif
165 #if defined(CONFIG_TN3215_CONSOLE)
166         if (strncmp(str, "3215", 5) == 0)
167                 SET_CONSOLE_3215;
168 #endif
169 #if defined(CONFIG_TN3270_CONSOLE)
170         if (strncmp(str, "3270", 5) == 0)
171                 SET_CONSOLE_3270;
172 #endif
173         return 1;
174 }
175
176 __setup("conmode=", conmode_setup);
177
178 static void __init conmode_default(void)
179 {
180         char query_buffer[1024];
181         char *ptr;
182
183         if (MACHINE_IS_VM) {
184                 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
185                 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
186                 ptr = strstr(query_buffer, "SUBCHANNEL =");
187                 console_irq = simple_strtoul(ptr + 13, NULL, 16);
188                 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
189                 ptr = strstr(query_buffer, "CONMODE");
190                 /*
191                  * Set the conmode to 3215 so that the device recognition 
192                  * will set the cu_type of the console to 3215. If the
193                  * conmode is 3270 and we don't set it back then both
194                  * 3215 and the 3270 driver will try to access the console
195                  * device (3215 as console and 3270 as normal tty).
196                  */
197                 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
198                 if (ptr == NULL) {
199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
200                         SET_CONSOLE_SCLP;
201 #endif
202                         return;
203                 }
204                 if (strncmp(ptr + 8, "3270", 4) == 0) {
205 #if defined(CONFIG_TN3270_CONSOLE)
206                         SET_CONSOLE_3270;
207 #elif defined(CONFIG_TN3215_CONSOLE)
208                         SET_CONSOLE_3215;
209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210                         SET_CONSOLE_SCLP;
211 #endif
212                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
213 #if defined(CONFIG_TN3215_CONSOLE)
214                         SET_CONSOLE_3215;
215 #elif defined(CONFIG_TN3270_CONSOLE)
216                         SET_CONSOLE_3270;
217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218                         SET_CONSOLE_SCLP;
219 #endif
220                 }
221         } else {
222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
223                 SET_CONSOLE_SCLP;
224 #endif
225         }
226 }
227
228 #ifdef CONFIG_ZFCPDUMP
229 static void __init setup_zfcpdump(unsigned int console_devno)
230 {
231         static char str[41];
232
233         if (ipl_info.type != IPL_TYPE_FCP_DUMP)
234                 return;
235         if (console_devno != -1)
236                 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
237                         ipl_info.data.fcp.dev_id.devno, console_devno);
238         else
239                 sprintf(str, " cio_ignore=all,!0.0.%04x",
240                         ipl_info.data.fcp.dev_id.devno);
241         strcat(boot_command_line, str);
242         console_loglevel = 2;
243 }
244 #else
245 static inline void setup_zfcpdump(unsigned int console_devno) {}
246 #endif /* CONFIG_ZFCPDUMP */
247
248  /*
249  * Reboot, halt and power_off stubs. They just call _machine_restart,
250  * _machine_halt or _machine_power_off. 
251  */
252
253 void machine_restart(char *command)
254 {
255         if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
256                 /*
257                  * Only unblank the console if we are called in enabled
258                  * context or a bust_spinlocks cleared the way for us.
259                  */
260                 console_unblank();
261         _machine_restart(command);
262 }
263
264 void machine_halt(void)
265 {
266         if (!in_interrupt() || oops_in_progress)
267                 /*
268                  * Only unblank the console if we are called in enabled
269                  * context or a bust_spinlocks cleared the way for us.
270                  */
271                 console_unblank();
272         _machine_halt();
273 }
274
275 void machine_power_off(void)
276 {
277         if (!in_interrupt() || oops_in_progress)
278                 /*
279                  * Only unblank the console if we are called in enabled
280                  * context or a bust_spinlocks cleared the way for us.
281                  */
282                 console_unblank();
283         _machine_power_off();
284 }
285
286 /*
287  * Dummy power off function.
288  */
289 void (*pm_power_off)(void) = machine_power_off;
290
291 static int __init early_parse_mem(char *p)
292 {
293         memory_end = memparse(p, &p);
294         memory_end_set = 1;
295         return 0;
296 }
297 early_param("mem", early_parse_mem);
298
299 #ifdef CONFIG_S390_SWITCH_AMODE
300 unsigned int switch_amode = 0;
301 EXPORT_SYMBOL_GPL(switch_amode);
302
303 static int set_amode_and_uaccess(unsigned long user_amode,
304                                  unsigned long user32_amode)
305 {
306         psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
307                         PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
308                         PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
309 #ifdef CONFIG_COMPAT
310         psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
311                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
312                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
313         psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
314                           PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
315                           PSW32_MASK_PSTATE;
316 #endif
317         psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
318                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
319
320         if (MACHINE_HAS_MVCOS) {
321                 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
322                 return 1;
323         } else {
324                 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
325                 return 0;
326         }
327 }
328
329 /*
330  * Switch kernel/user addressing modes?
331  */
332 static int __init early_parse_switch_amode(char *p)
333 {
334         switch_amode = 1;
335         return 0;
336 }
337 early_param("switch_amode", early_parse_switch_amode);
338
339 #else /* CONFIG_S390_SWITCH_AMODE */
340 static inline int set_amode_and_uaccess(unsigned long user_amode,
341                                         unsigned long user32_amode)
342 {
343         return 0;
344 }
345 #endif /* CONFIG_S390_SWITCH_AMODE */
346
347 #ifdef CONFIG_S390_EXEC_PROTECT
348 unsigned int s390_noexec = 0;
349 EXPORT_SYMBOL_GPL(s390_noexec);
350
351 /*
352  * Enable execute protection?
353  */
354 static int __init early_parse_noexec(char *p)
355 {
356         if (!strncmp(p, "off", 3))
357                 return 0;
358         switch_amode = 1;
359         s390_noexec = 1;
360         return 0;
361 }
362 early_param("noexec", early_parse_noexec);
363 #endif /* CONFIG_S390_EXEC_PROTECT */
364
365 static void setup_addressing_mode(void)
366 {
367         if (s390_noexec) {
368                 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
369                                           PSW32_ASC_SECONDARY))
370                         pr_info("Execute protection active, "
371                                 "mvcos available\n");
372                 else
373                         pr_info("Execute protection active, "
374                                 "mvcos not available\n");
375         } else if (switch_amode) {
376                 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
377                         pr_info("Address spaces switched, "
378                                 "mvcos available\n");
379                 else
380                         pr_info("Address spaces switched, "
381                                 "mvcos not available\n");
382         }
383 #ifdef CONFIG_TRACE_IRQFLAGS
384         sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
385         io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
386 #endif
387 }
388
389 static void __init
390 setup_lowcore(void)
391 {
392         struct _lowcore *lc;
393         int lc_pages;
394
395         /*
396          * Setup lowcore for boot cpu
397          */
398         lc_pages = sizeof(void *) == 8 ? 2 : 1;
399         lc = (struct _lowcore *)
400                 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
401         memset(lc, 0, lc_pages * PAGE_SIZE);
402         lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
403         lc->restart_psw.addr =
404                 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
405         if (switch_amode)
406                 lc->restart_psw.mask |= PSW_ASC_HOME;
407         lc->external_new_psw.mask = psw_kernel_bits;
408         lc->external_new_psw.addr =
409                 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
410         lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
411         lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
412         lc->program_new_psw.mask = psw_kernel_bits;
413         lc->program_new_psw.addr =
414                 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
415         lc->mcck_new_psw.mask =
416                 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
417         lc->mcck_new_psw.addr =
418                 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
419         lc->io_new_psw.mask = psw_kernel_bits;
420         lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
421         lc->clock_comparator = -1ULL;
422         lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
423         lc->async_stack = (unsigned long)
424                 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
425         lc->panic_stack = (unsigned long)
426                 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
427         lc->current_task = (unsigned long) init_thread_union.thread_info.task;
428         lc->thread_info = (unsigned long) &init_thread_union;
429 #ifndef CONFIG_64BIT
430         if (MACHINE_HAS_IEEE) {
431                 lc->extended_save_area_addr = (__u32)
432                         __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
433                 /* enable extended save area */
434                 __ctl_set_bit(14, 29);
435         }
436 #else
437         lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
438 #endif
439         set_prefix((u32)(unsigned long) lc);
440         lowcore_ptr[0] = lc;
441 }
442
443 static void __init
444 setup_resources(void)
445 {
446         struct resource *res, *sub_res;
447         int i;
448
449         code_resource.start = (unsigned long) &_text;
450         code_resource.end = (unsigned long) &_etext - 1;
451         data_resource.start = (unsigned long) &_etext;
452         data_resource.end = (unsigned long) &_edata - 1;
453
454         for (i = 0; i < MEMORY_CHUNKS; i++) {
455                 if (!memory_chunk[i].size)
456                         continue;
457                 res = alloc_bootmem_low(sizeof(struct resource));
458                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
459                 switch (memory_chunk[i].type) {
460                 case CHUNK_READ_WRITE:
461                         res->name = "System RAM";
462                         break;
463                 case CHUNK_READ_ONLY:
464                         res->name = "System ROM";
465                         res->flags |= IORESOURCE_READONLY;
466                         break;
467                 default:
468                         res->name = "reserved";
469                 }
470                 res->start = memory_chunk[i].addr;
471                 res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
472                 request_resource(&iomem_resource, res);
473
474                 if (code_resource.start >= res->start  &&
475                         code_resource.start <= res->end &&
476                         code_resource.end > res->end) {
477                         sub_res = alloc_bootmem_low(sizeof(struct resource));
478                         memcpy(sub_res, &code_resource,
479                                 sizeof(struct resource));
480                         sub_res->end = res->end;
481                         code_resource.start = res->end + 1;
482                         request_resource(res, sub_res);
483                 }
484
485                 if (code_resource.start >= res->start &&
486                         code_resource.start <= res->end &&
487                         code_resource.end <= res->end)
488                         request_resource(res, &code_resource);
489
490                 if (data_resource.start >= res->start &&
491                         data_resource.start <= res->end &&
492                         data_resource.end > res->end) {
493                         sub_res = alloc_bootmem_low(sizeof(struct resource));
494                         memcpy(sub_res, &data_resource,
495                                 sizeof(struct resource));
496                         sub_res->end = res->end;
497                         data_resource.start = res->end + 1;
498                         request_resource(res, sub_res);
499                 }
500
501                 if (data_resource.start >= res->start &&
502                         data_resource.start <= res->end &&
503                         data_resource.end <= res->end)
504                         request_resource(res, &data_resource);
505         }
506 }
507
508 unsigned long real_memory_size;
509 EXPORT_SYMBOL_GPL(real_memory_size);
510
511 static void __init setup_memory_end(void)
512 {
513         unsigned long memory_size;
514         unsigned long max_mem;
515         int i;
516
517 #ifdef CONFIG_ZFCPDUMP
518         if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
519                 memory_end = ZFCPDUMP_HSA_SIZE;
520                 memory_end_set = 1;
521         }
522 #endif
523         memory_size = 0;
524         memory_end &= PAGE_MASK;
525
526         max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
527         memory_end = min(max_mem, memory_end);
528
529         /*
530          * Make sure all chunks are MAX_ORDER aligned so we don't need the
531          * extra checks that HOLES_IN_ZONE would require.
532          */
533         for (i = 0; i < MEMORY_CHUNKS; i++) {
534                 unsigned long start, end;
535                 struct mem_chunk *chunk;
536                 unsigned long align;
537
538                 chunk = &memory_chunk[i];
539                 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
540                 start = (chunk->addr + align - 1) & ~(align - 1);
541                 end = (chunk->addr + chunk->size) & ~(align - 1);
542                 if (start >= end)
543                         memset(chunk, 0, sizeof(*chunk));
544                 else {
545                         chunk->addr = start;
546                         chunk->size = end - start;
547                 }
548         }
549
550         for (i = 0; i < MEMORY_CHUNKS; i++) {
551                 struct mem_chunk *chunk = &memory_chunk[i];
552
553                 real_memory_size = max(real_memory_size,
554                                        chunk->addr + chunk->size);
555                 if (chunk->addr >= max_mem) {
556                         memset(chunk, 0, sizeof(*chunk));
557                         continue;
558                 }
559                 if (chunk->addr + chunk->size > max_mem)
560                         chunk->size = max_mem - chunk->addr;
561                 memory_size = max(memory_size, chunk->addr + chunk->size);
562         }
563         if (!memory_end)
564                 memory_end = memory_size;
565 }
566
567 static void __init
568 setup_memory(void)
569 {
570         unsigned long bootmap_size;
571         unsigned long start_pfn, end_pfn;
572         int i;
573
574         /*
575          * partially used pages are not usable - thus
576          * we are rounding upwards:
577          */
578         start_pfn = PFN_UP(__pa(&_end));
579         end_pfn = max_pfn = PFN_DOWN(memory_end);
580
581 #ifdef CONFIG_BLK_DEV_INITRD
582         /*
583          * Move the initrd in case the bitmap of the bootmem allocater
584          * would overwrite it.
585          */
586
587         if (INITRD_START && INITRD_SIZE) {
588                 unsigned long bmap_size;
589                 unsigned long start;
590
591                 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
592                 bmap_size = PFN_PHYS(bmap_size);
593
594                 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
595                         start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
596
597                         if (start + INITRD_SIZE > memory_end) {
598                                 pr_err("initrd extends beyond end of "
599                                        "memory (0x%08lx > 0x%08lx) "
600                                        "disabling initrd\n",
601                                        start + INITRD_SIZE, memory_end);
602                                 INITRD_START = INITRD_SIZE = 0;
603                         } else {
604                                 pr_info("Moving initrd (0x%08lx -> "
605                                         "0x%08lx, size: %ld)\n",
606                                         INITRD_START, start, INITRD_SIZE);
607                                 memmove((void *) start, (void *) INITRD_START,
608                                         INITRD_SIZE);
609                                 INITRD_START = start;
610                         }
611                 }
612         }
613 #endif
614
615         /*
616          * Initialize the boot-time allocator
617          */
618         bootmap_size = init_bootmem(start_pfn, end_pfn);
619
620         /*
621          * Register RAM areas with the bootmem allocator.
622          */
623
624         for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
625                 unsigned long start_chunk, end_chunk, pfn;
626
627                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
628                         continue;
629                 start_chunk = PFN_DOWN(memory_chunk[i].addr);
630                 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
631                 end_chunk = min(end_chunk, end_pfn);
632                 if (start_chunk >= end_chunk)
633                         continue;
634                 add_active_range(0, start_chunk, end_chunk);
635                 pfn = max(start_chunk, start_pfn);
636                 for (; pfn < end_chunk; pfn++)
637                         page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
638         }
639
640         psw_set_key(PAGE_DEFAULT_KEY);
641
642         free_bootmem_with_active_regions(0, max_pfn);
643
644         /*
645          * Reserve memory used for lowcore/command line/kernel image.
646          */
647         reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
648         reserve_bootmem((unsigned long)_stext,
649                         PFN_PHYS(start_pfn) - (unsigned long)_stext,
650                         BOOTMEM_DEFAULT);
651         /*
652          * Reserve the bootmem bitmap itself as well. We do this in two
653          * steps (first step was init_bootmem()) because this catches
654          * the (very unlikely) case of us accidentally initializing the
655          * bootmem allocator with an invalid RAM area.
656          */
657         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
658                         BOOTMEM_DEFAULT);
659
660 #ifdef CONFIG_BLK_DEV_INITRD
661         if (INITRD_START && INITRD_SIZE) {
662                 if (INITRD_START + INITRD_SIZE <= memory_end) {
663                         reserve_bootmem(INITRD_START, INITRD_SIZE,
664                                         BOOTMEM_DEFAULT);
665                         initrd_start = INITRD_START;
666                         initrd_end = initrd_start + INITRD_SIZE;
667                 } else {
668                         pr_err("initrd extends beyond end of "
669                                "memory (0x%08lx > 0x%08lx) "
670                                "disabling initrd\n",
671                                initrd_start + INITRD_SIZE, memory_end);
672                         initrd_start = initrd_end = 0;
673                 }
674         }
675 #endif
676 }
677
678 /*
679  * Setup hardware capabilities.
680  */
681 static void __init setup_hwcaps(void)
682 {
683         static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
684         unsigned long long facility_list_extended;
685         unsigned int facility_list;
686         int i;
687
688         facility_list = stfl();
689         /*
690          * The store facility list bits numbers as found in the principles
691          * of operation are numbered with bit 1UL<<31 as number 0 to
692          * bit 1UL<<0 as number 31.
693          *   Bit 0: instructions named N3, "backported" to esa-mode
694          *   Bit 2: z/Architecture mode is active
695          *   Bit 7: the store-facility-list-extended facility is installed
696          *   Bit 17: the message-security assist is installed
697          *   Bit 19: the long-displacement facility is installed
698          *   Bit 21: the extended-immediate facility is installed
699          *   Bit 22: extended-translation facility 3 is installed
700          *   Bit 30: extended-translation facility 3 enhancement facility
701          * These get translated to:
702          *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
703          *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
704          *   HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
705          *   HWCAP_S390_ETF3EH bit 8 (22 && 30).
706          */
707         for (i = 0; i < 6; i++)
708                 if (facility_list & (1UL << (31 - stfl_bits[i])))
709                         elf_hwcap |= 1UL << i;
710
711         if ((facility_list & (1UL << (31 - 22)))
712             && (facility_list & (1UL << (31 - 30))))
713                 elf_hwcap |= 1UL << 8;
714
715         /*
716          * Check for additional facilities with store-facility-list-extended.
717          * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
718          * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
719          * as stored by stfl, bits 32-xxx contain additional facilities.
720          * How many facility words are stored depends on the number of
721          * doublewords passed to the instruction. The additional facilites
722          * are:
723          *   Bit 42: decimal floating point facility is installed
724          *   Bit 44: perform floating point operation facility is installed
725          * translated to:
726          *   HWCAP_S390_DFP bit 6 (42 && 44).
727          */
728         if ((elf_hwcap & (1UL << 2)) &&
729             __stfle(&facility_list_extended, 1) > 0) {
730                 if ((facility_list_extended & (1ULL << (63 - 42)))
731                     && (facility_list_extended & (1ULL << (63 - 44))))
732                         elf_hwcap |= 1UL << 6;
733         }
734
735         if (MACHINE_HAS_HPAGE)
736                 elf_hwcap |= 1UL << 7;
737
738         switch (S390_lowcore.cpu_id.machine) {
739         case 0x9672:
740 #if !defined(CONFIG_64BIT)
741         default:        /* Use "g5" as default for 31 bit kernels. */
742 #endif
743                 strcpy(elf_platform, "g5");
744                 break;
745         case 0x2064:
746         case 0x2066:
747 #if defined(CONFIG_64BIT)
748         default:        /* Use "z900" as default for 64 bit kernels. */
749 #endif
750                 strcpy(elf_platform, "z900");
751                 break;
752         case 0x2084:
753         case 0x2086:
754                 strcpy(elf_platform, "z990");
755                 break;
756         case 0x2094:
757         case 0x2096:
758                 strcpy(elf_platform, "z9-109");
759                 break;
760         case 0x2097:
761         case 0x2098:
762                 strcpy(elf_platform, "z10");
763                 break;
764         }
765 }
766
767 /*
768  * Setup function called from init/main.c just after the banner
769  * was printed.
770  */
771
772 void __init
773 setup_arch(char **cmdline_p)
774 {
775         /* set up preferred console */
776         add_preferred_console("ttyS", 0, NULL);
777
778         /*
779          * print what head.S has found out about the machine
780          */
781 #ifndef CONFIG_64BIT
782         if (MACHINE_IS_VM)
783                 pr_info("Linux is running as a z/VM "
784                         "guest operating system in 31-bit mode\n");
785         else
786                 pr_info("Linux is running natively in 31-bit mode\n");
787         if (MACHINE_HAS_IEEE)
788                 pr_info("The hardware system has IEEE compatible "
789                         "floating point units\n");
790         else
791                 pr_info("The hardware system has no IEEE compatible "
792                         "floating point units\n");
793 #else /* CONFIG_64BIT */
794         if (MACHINE_IS_VM)
795                 pr_info("Linux is running as a z/VM "
796                         "guest operating system in 64-bit mode\n");
797         else if (MACHINE_IS_KVM) {
798                 pr_info("Linux is running under KVM in 64-bit mode\n");
799                 add_preferred_console("hvc", 0, NULL);
800                 s390_virtio_console_init();
801         } else
802                 pr_info("Linux is running natively in 64-bit mode\n");
803 #endif /* CONFIG_64BIT */
804
805         /* Have one command line that is parsed and saved in /proc/cmdline */
806         /* boot_command_line has been already set up in early.c */
807         *cmdline_p = boot_command_line;
808
809         ROOT_DEV = Root_RAM0;
810
811         init_mm.start_code = PAGE_OFFSET;
812         init_mm.end_code = (unsigned long) &_etext;
813         init_mm.end_data = (unsigned long) &_edata;
814         init_mm.brk = (unsigned long) &_end;
815
816         if (MACHINE_HAS_MVCOS)
817                 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
818         else
819                 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
820
821         parse_early_param();
822
823         setup_ipl();
824         setup_memory_end();
825         setup_addressing_mode();
826         setup_memory();
827         setup_resources();
828         setup_lowcore();
829
830         cpu_init();
831         __cpu_logical_map[0] = stap();
832         s390_init_cpu_topology();
833
834         /*
835          * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
836          */
837         setup_hwcaps();
838
839         /*
840          * Create kernel page tables and switch to virtual addressing.
841          */
842         paging_init();
843
844         /* Setup default console */
845         conmode_default();
846
847         /* Setup zfcpdump support */
848         setup_zfcpdump(console_devno);
849 }