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[S390] Support for s390 Pseudo Random Number Generator
[deliverable/linux.git] / arch / s390 / kernel / setup.c
CommitLineData
1da177e4
LT		 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>
1da177e4
LT		 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>
1e8e3383 38#include <linux/device.h>
585c3047 39#include <linux/notifier.h>
65912a84 40#include <linux/pfn.h>
2b67fc46 41#include <linux/reboot.h>
1da177e4
LT		 42
43#include <asm/uaccess.h>
44#include <asm/system.h>
45#include <asm/smp.h>
46#include <asm/mmu_context.h>
47#include <asm/cpcmd.h>
48#include <asm/lowcore.h>
49#include <asm/irq.h>
0b642ede
PO		 50#include <asm/page.h>
51#include <asm/ptrace.h>
cc13ad62 52#include <asm/sections.h>
c1821c2e
GS		 53#include <asm/compat.h>
54
55long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
56 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
57long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
58 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
59 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
1da177e4 60
d02765d1
GS		 61/*
62 * User copy operations.
63 */
64struct uaccess_ops uaccess;
65EXPORT_SYMBOL_GPL(uaccess);
66
1da177e4
LT		 67/*
68 * Machine setup..
69 */
70unsigned int console_mode = 0;
71unsigned int console_devno = -1;
72unsigned int console_irq = -1;
1da177e4 73unsigned long machine_flags = 0;
36a2bd42 74
f4eb07c1 75struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
1da177e4 76volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
c9e37353 77static unsigned long __initdata memory_end;
1da177e4 78
1da177e4
LT		 79/*
80 * This is set up by the setup-routine at boot-time
81 * for S390 need to find out, what we have to setup
82 * using address 0x10400 ...
83 */
84
85#include <asm/setup.h>
86
1da177e4
LT		 87static struct resource code_resource = {
88 .name = "Kernel code",
89 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
90};
91
92static struct resource data_resource = {
93 .name = "Kernel data",
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
95};
96
97/*
98 * cpu_init() initializes state that is per-CPU.
99 */
100void __devinit cpu_init (void)
101{
102 int addr = hard_smp_processor_id();
103
104 /*
105 * Store processor id in lowcore (used e.g. in timer_interrupt)
106 */
94c12cc7 107 asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
1da177e4
LT		 108 S390_lowcore.cpu_data.cpu_addr = addr;
109
110 /*
111 * Force FPU initialization:
112 */
113 clear_thread_flag(TIF_USEDFPU);
114 clear_used_math();
115
116 atomic_inc(&init_mm.mm_count);
117 current->active_mm = &init_mm;
118 if (current->mm)
119 BUG();
120 enter_lazy_tlb(&init_mm, current);
121}
122
123/*
124 * VM halt and poweroff setup routines
125 */
126char vmhalt_cmd[128] = "";
127char vmpoff_cmd[128] = "";
2b67fc46 128static char vmpanic_cmd[128] = "";
1da177e4
LT		 129
130static inline void strncpy_skip_quote(char *dst, char *src, int n)
131{
132 int sx, dx;
133
134 dx = 0;
135 for (sx = 0; src[sx] != 0; sx++) {
136 if (src[sx] == '"') continue;
137 dst[dx++] = src[sx];
138 if (dx >= n) break;
139 }
140}
141
142static int __init vmhalt_setup(char *str)
143{
144 strncpy_skip_quote(vmhalt_cmd, str, 127);
145 vmhalt_cmd[127] = 0;
146 return 1;
147}
148
149__setup("vmhalt=", vmhalt_setup);
150
151static int __init vmpoff_setup(char *str)
152{
153 strncpy_skip_quote(vmpoff_cmd, str, 127);
154 vmpoff_cmd[127] = 0;
155 return 1;
156}
157
158__setup("vmpoff=", vmpoff_setup);
159
585c3047
PO		 160static int vmpanic_notify(struct notifier_block *self, unsigned long event,
161 void *data)
162{
163 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
164 cpcmd(vmpanic_cmd, NULL, 0, NULL);
165
166 return NOTIFY_OK;
167}
168
169#define PANIC_PRI_VMPANIC 0
170
171static struct notifier_block vmpanic_nb = {
172 .notifier_call = vmpanic_notify,
173 .priority = PANIC_PRI_VMPANIC
174};
175
176static int __init vmpanic_setup(char *str)
177{
178 static int register_done __initdata = 0;
179
180 strncpy_skip_quote(vmpanic_cmd, str, 127);
181 vmpanic_cmd[127] = 0;
182 if (!register_done) {
183 register_done = 1;
184 atomic_notifier_chain_register(&panic_notifier_list,
185 &vmpanic_nb);
186 }
187 return 1;
188}
189
190__setup("vmpanic=", vmpanic_setup);
191
1da177e4
LT		 192/*
193 * condev= and conmode= setup parameter.
194 */
195
196static int __init condev_setup(char *str)
197{
198 int vdev;
199
200 vdev = simple_strtoul(str, &str, 0);
201 if (vdev >= 0 && vdev < 65536) {
202 console_devno = vdev;
203 console_irq = -1;
204 }
205 return 1;
206}
207
208__setup("condev=", condev_setup);
209
210static int __init conmode_setup(char *str)
211{
212#if defined(CONFIG_SCLP_CONSOLE)
213 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
214 SET_CONSOLE_SCLP;
215#endif
216#if defined(CONFIG_TN3215_CONSOLE)
217 if (strncmp(str, "3215", 5) == 0)
218 SET_CONSOLE_3215;
219#endif
220#if defined(CONFIG_TN3270_CONSOLE)
221 if (strncmp(str, "3270", 5) == 0)
222 SET_CONSOLE_3270;
223#endif
224 return 1;
225}
226
227__setup("conmode=", conmode_setup);
228
229static void __init conmode_default(void)
230{
231 char query_buffer[1024];
232 char *ptr;
233
234 if (MACHINE_IS_VM) {
740b5706 235 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
1da177e4
LT		 236 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
237 ptr = strstr(query_buffer, "SUBCHANNEL =");
238 console_irq = simple_strtoul(ptr + 13, NULL, 16);
740b5706 239 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
1da177e4
LT		 240 ptr = strstr(query_buffer, "CONMODE");
241 /*
242 * Set the conmode to 3215 so that the device recognition
243 * will set the cu_type of the console to 3215. If the
244 * conmode is 3270 and we don't set it back then both
245 * 3215 and the 3270 driver will try to access the console
246 * device (3215 as console and 3270 as normal tty).
247 */
740b5706 248 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
1da177e4
LT		 249 if (ptr == NULL) {
250#if defined(CONFIG_SCLP_CONSOLE)
251 SET_CONSOLE_SCLP;
252#endif
253 return;
254 }
255 if (strncmp(ptr + 8, "3270", 4) == 0) {
256#if defined(CONFIG_TN3270_CONSOLE)
257 SET_CONSOLE_3270;
258#elif defined(CONFIG_TN3215_CONSOLE)
259 SET_CONSOLE_3215;
260#elif defined(CONFIG_SCLP_CONSOLE)
261 SET_CONSOLE_SCLP;
262#endif
263 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
264#if defined(CONFIG_TN3215_CONSOLE)
265 SET_CONSOLE_3215;
266#elif defined(CONFIG_TN3270_CONSOLE)
267 SET_CONSOLE_3270;
268#elif defined(CONFIG_SCLP_CONSOLE)
269 SET_CONSOLE_SCLP;
270#endif
271 }
272 } else if (MACHINE_IS_P390) {
273#if defined(CONFIG_TN3215_CONSOLE)
274 SET_CONSOLE_3215;
275#elif defined(CONFIG_TN3270_CONSOLE)
276 SET_CONSOLE_3270;
277#endif
278 } else {
279#if defined(CONFIG_SCLP_CONSOLE)
280 SET_CONSOLE_SCLP;
281#endif
282 }
283}
284
285#ifdef CONFIG_SMP
1da177e4
LT		 286void (*_machine_restart)(char *command) = machine_restart_smp;
287void (*_machine_halt)(void) = machine_halt_smp;
288void (*_machine_power_off)(void) = machine_power_off_smp;
289#else
290/*
291 * Reboot, halt and power_off routines for non SMP.
292 */
1da177e4
LT		 293static void do_machine_restart_nonsmp(char * __unused)
294{
ff6b8ea6 295 do_reipl();
1da177e4
LT		 296}
297
298static void do_machine_halt_nonsmp(void)
299{
300 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
740b5706 301 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
1da177e4
LT		 302 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
303}
304
305static void do_machine_power_off_nonsmp(void)
306{
307 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
740b5706 308 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
1da177e4
LT		 309 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
310}
311
312void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
313void (*_machine_halt)(void) = do_machine_halt_nonsmp;
314void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
315#endif
316
317 /*
318 * Reboot, halt and power_off stubs. They just call _machine_restart,
319 * _machine_halt or _machine_power_off.
320 */
321
322void machine_restart(char *command)
323{
06fa46a2
MS		 324 if (!in_interrupt() || oops_in_progress)
325 /*
326 * Only unblank the console if we are called in enabled
327 * context or a bust_spinlocks cleared the way for us.
328 */
329 console_unblank();
1da177e4
LT		 330 _machine_restart(command);
331}
332
1da177e4
LT		 333void machine_halt(void)
334{
06fa46a2
MS		 335 if (!in_interrupt() || oops_in_progress)
336 /*
337 * Only unblank the console if we are called in enabled
338 * context or a bust_spinlocks cleared the way for us.
339 */
340 console_unblank();
1da177e4
LT		 341 _machine_halt();
342}
343
1da177e4
LT		 344void machine_power_off(void)
345{
06fa46a2
MS		 346 if (!in_interrupt() || oops_in_progress)
347 /*
348 * Only unblank the console if we are called in enabled
349 * context or a bust_spinlocks cleared the way for us.
350 */
351 console_unblank();
1da177e4
LT		 352 _machine_power_off();
353}
354
53df751c
MS		 355/*
356 * Dummy power off function.
357 */
358void (*pm_power_off)(void) = machine_power_off;
359
59685296
HC		 360static int __init early_parse_mem(char *p)
361{
362 memory_end = memparse(p, &p);
363 return 0;
364}
365early_param("mem", early_parse_mem);
366
367/*
368 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
369 */
370static int __init early_parse_ipldelay(char *p)
c9e37353 371{
c9e37353 372 unsigned long delay = 0;
1da177e4 373
59685296 374 delay = simple_strtoul(p, &p, 0);
1da177e4 375
59685296
HC		 376 switch (*p) {
377 case 's':
378 case 'S':
379 delay *= 1000000;
380 break;
381 case 'm':
382 case 'M':
383 delay *= 60 * 1000000;
c9e37353 384 }
59685296
HC		 385
386 /* now wait for the requested amount of time */
387 udelay(delay);
388
389 return 0;
c9e37353 390}
59685296 391early_param("ipldelay", early_parse_ipldelay);
c9e37353 392
c1821c2e
GS		 393#ifdef CONFIG_S390_SWITCH_AMODE
394unsigned int switch_amode = 0;
395EXPORT_SYMBOL_GPL(switch_amode);
396
397static inline void set_amode_and_uaccess(unsigned long user_amode,
398 unsigned long user32_amode)
399{
400 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
401 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
402 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
403#ifdef CONFIG_COMPAT
404 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
405 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
406 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
407 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
408 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
409 PSW32_MASK_PSTATE;
410#endif
411 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
412 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
413
414 if (MACHINE_HAS_MVCOS) {
415 printk("mvcos available.\n");
416 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
417 } else {
418 printk("mvcos not available.\n");
419 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
420 }
421}
422
423/*
424 * Switch kernel/user addressing modes?
425 */
426static int __init early_parse_switch_amode(char *p)
427{
428 switch_amode = 1;
429 return 0;
430}
431early_param("switch_amode", early_parse_switch_amode);
432
433#else /* CONFIG_S390_SWITCH_AMODE */
434static inline void set_amode_and_uaccess(unsigned long user_amode,
435 unsigned long user32_amode)
436{
437}
438#endif /* CONFIG_S390_SWITCH_AMODE */
439
440#ifdef CONFIG_S390_EXEC_PROTECT
441unsigned int s390_noexec = 0;
442EXPORT_SYMBOL_GPL(s390_noexec);
443
444/*
445 * Enable execute protection?
446 */
447static int __init early_parse_noexec(char *p)
448{
449 if (!strncmp(p, "off", 3))
450 return 0;
451 switch_amode = 1;
452 s390_noexec = 1;
453 return 0;
454}
455early_param("noexec", early_parse_noexec);
456#endif /* CONFIG_S390_EXEC_PROTECT */
457
458static void setup_addressing_mode(void)
459{
460 if (s390_noexec) {
461 printk("S390 execute protection active, ");
462 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
463 return;
464 }
465 if (switch_amode) {
466 printk("S390 address spaces switched, ");
467 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
468 }
469}
470
c9e37353
HC		 471static void __init
472setup_lowcore(void)
473{
474 struct _lowcore *lc;
475 int lc_pages;
476
477 /*
478 * Setup lowcore for boot cpu
479 */
480 lc_pages = sizeof(void *) == 8 ? 2 : 1;
481 lc = (struct _lowcore *)
482 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
483 memset(lc, 0, lc_pages * PAGE_SIZE);
0b642ede 484 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
c9e37353
HC		 485 lc->restart_psw.addr =
486 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
c1821c2e
GS		 487 if (switch_amode)
488 lc->restart_psw.mask |= PSW_ASC_HOME;
489 lc->external_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 490 lc->external_new_psw.addr =
491 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
c1821c2e 492 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
c9e37353 493 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
c1821c2e 494 lc->program_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 495 lc->program_new_psw.addr =
496 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
77fa2245 497 lc->mcck_new_psw.mask =
c1821c2e 498 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
c9e37353
HC		 499 lc->mcck_new_psw.addr =
500 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
c1821c2e 501 lc->io_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 502 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
503 lc->ipl_device = S390_lowcore.ipl_device;
504 lc->jiffy_timer = -1LL;
505 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
506 lc->async_stack = (unsigned long)
507 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
c9e37353
HC		 508 lc->panic_stack = (unsigned long)
509 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
c9e37353
HC		 510 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
511 lc->thread_info = (unsigned long) &init_thread_union;
347a8dc3 512#ifndef CONFIG_64BIT
77fa2245
HC		 513 if (MACHINE_HAS_IEEE) {
514 lc->extended_save_area_addr = (__u32)
515 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
516 /* enable extended save area */
c4972f33 517 __ctl_set_bit(14, 29);
77fa2245
HC		 518 }
519#endif
c9e37353
HC		 520 set_prefix((u32)(unsigned long) lc);
521}
522
523static void __init
524setup_resources(void)
525{
526 struct resource *res;
527 int i;
528
cc13ad62
HC		 529 code_resource.start = (unsigned long) &_text;
530 code_resource.end = (unsigned long) &_etext - 1;
531 data_resource.start = (unsigned long) &_etext;
532 data_resource.end = (unsigned long) &_edata - 1;
533
c9e37353
HC		 534 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
535 res = alloc_bootmem_low(sizeof(struct resource));
536 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
537 switch (memory_chunk[i].type) {
538 case CHUNK_READ_WRITE:
539 res->name = "System RAM";
540 break;
541 case CHUNK_READ_ONLY:
542 res->name = "System ROM";
543 res->flags |= IORESOURCE_READONLY;
544 break;
545 default:
546 res->name = "reserved";
547 }
548 res->start = memory_chunk[i].addr;
549 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
550 request_resource(&iomem_resource, res);
551 request_resource(res, &code_resource);
552 request_resource(res, &data_resource);
553 }
554}
555
8b62bc96
HC		 556static void __init setup_memory_end(void)
557{
558 unsigned long real_size, memory_size;
559 unsigned long max_mem, max_phys;
560 int i;
561
562 memory_size = real_size = 0;
de338a37 563 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
8b62bc96
HC		 564 memory_end &= PAGE_MASK;
565
566 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
567
568 for (i = 0; i < MEMORY_CHUNKS; i++) {
569 struct mem_chunk *chunk = &memory_chunk[i];
570
571 real_size = max(real_size, chunk->addr + chunk->size);
572 if (chunk->addr >= max_mem) {
573 memset(chunk, 0, sizeof(*chunk));
574 continue;
575 }
576 if (chunk->addr + chunk->size > max_mem)
577 chunk->size = max_mem - chunk->addr;
578 memory_size = max(memory_size, chunk->addr + chunk->size);
579 }
580 if (!memory_end)
581 memory_end = memory_size;
8b62bc96
HC		 582}
583
c9e37353
HC		 584static void __init
585setup_memory(void)
586{
587 unsigned long bootmap_size;
0b642ede 588 unsigned long start_pfn, end_pfn, init_pfn;
c9e37353 589 int i;
1da177e4
LT		 590
591 /*
592 * partially used pages are not usable - thus
593 * we are rounding upwards:
594 */
65912a84
HC		 595 start_pfn = PFN_UP(__pa(&_end));
596 end_pfn = max_pfn = PFN_DOWN(memory_end);
1da177e4 597
0b642ede
PO		 598 /* Initialize storage key for kernel pages */
599 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
600 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
601
65912a84
HC		 602#ifdef CONFIG_BLK_DEV_INITRD
603 /*
604 * Move the initrd in case the bitmap of the bootmem allocater
605 * would overwrite it.
606 */
607
608 if (INITRD_START && INITRD_SIZE) {
609 unsigned long bmap_size;
610 unsigned long start;
611
612 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
613 bmap_size = PFN_PHYS(bmap_size);
614
615 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
616 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
617
618 if (start + INITRD_SIZE > memory_end) {
619 printk("initrd extends beyond end of memory "
620 "(0x%08lx > 0x%08lx)\n"
621 "disabling initrd\n",
622 start + INITRD_SIZE, memory_end);
623 INITRD_START = INITRD_SIZE = 0;
624 } else {
625 printk("Moving initrd (0x%08lx -> 0x%08lx, "
626 "size: %ld)\n",
627 INITRD_START, start, INITRD_SIZE);
628 memmove((void *) start, (void *) INITRD_START,
629 INITRD_SIZE);
630 INITRD_START = start;
631 }
632 }
633 }
634#endif
635
1da177e4 636 /*
7676bef9 637 * Initialize the boot-time allocator
1da177e4
LT		 638 */
639 bootmap_size = init_bootmem(start_pfn, end_pfn);
640
641 /*
642 * Register RAM areas with the bootmem allocator.
643 */
c9e37353 644
0b642ede 645 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
39b742f9 646 unsigned long start_chunk, end_chunk, pfn;
1da177e4
LT		 647
648 if (memory_chunk[i].type != CHUNK_READ_WRITE)
649 continue;
39b742f9
HC		 650 start_chunk = PFN_DOWN(memory_chunk[i].addr);
651 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
652 end_chunk = min(end_chunk, end_pfn);
653 if (start_chunk >= end_chunk)
654 continue;
655 add_active_range(0, start_chunk, end_chunk);
656 pfn = max(start_chunk, start_pfn);
657 for (; pfn <= end_chunk; pfn++)
658 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
1da177e4
LT		 659 }
660
0b642ede
PO		 661 psw_set_key(PAGE_DEFAULT_KEY);
662
39b742f9
HC		 663 free_bootmem_with_active_regions(0, max_pfn);
664 reserve_bootmem(0, PFN_PHYS(start_pfn));
c9e37353
HC		 665
666 /*
667 * Reserve the bootmem bitmap itself as well. We do this in two
668 * steps (first step was init_bootmem()) because this catches
669 * the (very unlikely) case of us accidentally initializing the
670 * bootmem allocator with an invalid RAM area.
671 */
672 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
1da177e4
LT		 673
674#ifdef CONFIG_BLK_DEV_INITRD
65912a84 675 if (INITRD_START && INITRD_SIZE) {
1da177e4
LT		 676 if (INITRD_START + INITRD_SIZE <= memory_end) {
677 reserve_bootmem(INITRD_START, INITRD_SIZE);
678 initrd_start = INITRD_START;
679 initrd_end = initrd_start + INITRD_SIZE;
680 } else {
c9e37353
HC		 681 printk("initrd extends beyond end of memory "
682 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
683 initrd_start + INITRD_SIZE, memory_end);
684 initrd_start = initrd_end = 0;
1da177e4 685 }
c9e37353 686 }
1da177e4 687#endif
c9e37353 688}
1da177e4 689
c9e37353
HC		 690/*
691 * Setup function called from init/main.c just after the banner
692 * was printed.
693 */
1da177e4 694
c9e37353
HC		 695void __init
696setup_arch(char **cmdline_p)
697{
1da177e4 698 /*
c9e37353 699 * print what head.S has found out about the machine
1da177e4 700 */
347a8dc3 701#ifndef CONFIG_64BIT
c9e37353
HC		 702 printk((MACHINE_IS_VM) ?
703 "We are running under VM (31 bit mode)\n" :
704 "We are running native (31 bit mode)\n");
705 printk((MACHINE_HAS_IEEE) ?
706 "This machine has an IEEE fpu\n" :
707 "This machine has no IEEE fpu\n");
347a8dc3 708#else /* CONFIG_64BIT */
c9e37353
HC		 709 printk((MACHINE_IS_VM) ?
710 "We are running under VM (64 bit mode)\n" :
711 "We are running native (64 bit mode)\n");
347a8dc3 712#endif /* CONFIG_64BIT */
c9e37353 713
59685296
HC		 714 /* Save unparsed command line copy for /proc/cmdline */
715 strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
716
717 *cmdline_p = COMMAND_LINE;
718 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
719
c9e37353 720 ROOT_DEV = Root_RAM0;
59685296
HC		 721
722 init_mm.start_code = PAGE_OFFSET;
723 init_mm.end_code = (unsigned long) &_etext;
724 init_mm.end_data = (unsigned long) &_edata;
725 init_mm.brk = (unsigned long) &_end;
726
6c2a9e6d
GS		 727 if (MACHINE_HAS_MVCOS)
728 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
729 else
730 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
731
59685296
HC		 732 parse_early_param();
733
8b62bc96 734 setup_memory_end();
c1821c2e 735 setup_addressing_mode();
c9e37353
HC		 736 setup_memory();
737 setup_resources();
738 setup_lowcore();
739
1da177e4
LT		 740 cpu_init();
741 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
255acee7 742 smp_setup_cpu_possible_map();
1da177e4
LT		 743
744 /*
745 * Create kernel page tables and switch to virtual addressing.
746 */
747 paging_init();
748
749 /* Setup default console */
750 conmode_default();
751}
752
753void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
754{
755 printk("cpu %d "
756#ifdef CONFIG_SMP
757 "phys_idx=%d "
758#endif
759 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
760 cpuinfo->cpu_nr,
761#ifdef CONFIG_SMP
762 cpuinfo->cpu_addr,
763#endif
764 cpuinfo->cpu_id.version,
765 cpuinfo->cpu_id.ident,
766 cpuinfo->cpu_id.machine,
767 cpuinfo->cpu_id.unused);
768}
769
770/*
771 * show_cpuinfo - Get information on one CPU for use by procfs.
772 */
773
774static int show_cpuinfo(struct seq_file *m, void *v)
775{
776 struct cpuinfo_S390 *cpuinfo;
777 unsigned long n = (unsigned long) v - 1;
778
b7ae9dd8 779 preempt_disable();
1da177e4
LT		 780 if (!n) {
781 seq_printf(m, "vendor_id : IBM/S390\n"
782 "# processors : %i\n"
783 "bogomips per cpu: %lu.%02lu\n",
784 num_online_cpus(), loops_per_jiffy/(500000/HZ),
785 (loops_per_jiffy/(5000/HZ))%100);
786 }
787 if (cpu_online(n)) {
788#ifdef CONFIG_SMP
789 if (smp_processor_id() == n)
790 cpuinfo = &S390_lowcore.cpu_data;
791 else
792 cpuinfo = &lowcore_ptr[n]->cpu_data;
793#else
794 cpuinfo = &S390_lowcore.cpu_data;
795#endif
796 seq_printf(m, "processor %li: "
797 "version = %02X, "
798 "identification = %06X, "
799 "machine = %04X\n",
800 n, cpuinfo->cpu_id.version,
801 cpuinfo->cpu_id.ident,
802 cpuinfo->cpu_id.machine);
803 }
b7ae9dd8 804 preempt_enable();
1da177e4
LT		 805 return 0;
806}
807
808static void *c_start(struct seq_file *m, loff_t *pos)
809{
810 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
811}
812static void *c_next(struct seq_file *m, void *v, loff_t *pos)
813{
814 ++*pos;
815 return c_start(m, pos);
816}
817static void c_stop(struct seq_file *m, void *v)
818{
819}
820struct seq_operations cpuinfo_op = {
821 .start = c_start,
822 .next = c_next,
823 .stop = c_stop,
824 .show = show_cpuinfo,
825};
826
Linux kernel - Deliverables
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