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[S390] raw3270: use mutex instead of semaphore
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
fe355b7f 41#include <linux/ctype.h>
2b67fc46 42#include <linux/reboot.h>
1da177e4 43
46b05d26 44#include <asm/ipl.h>
1da177e4
LT		 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>
0b642ede
PO		 52#include <asm/page.h>
53#include <asm/ptrace.h>
cc13ad62 54#include <asm/sections.h>
fe355b7f 55#include <asm/ebcdic.h>
c1821c2e
GS		 56#include <asm/compat.h>
57
58long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
59 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
60long 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);
1da177e4 63
d02765d1
GS		 64/*
65 * User copy operations.
66 */
67struct uaccess_ops uaccess;
d4ee453b 68EXPORT_SYMBOL(uaccess);
d02765d1 69
1da177e4
LT		 70/*
71 * Machine setup..
72 */
73unsigned int console_mode = 0;
74unsigned int console_devno = -1;
75unsigned int console_irq = -1;
1da177e4 76unsigned long machine_flags = 0;
cf8ba7a9
MS		 77unsigned long elf_hwcap = 0;
78char elf_platform[ELF_PLATFORM_SIZE];
36a2bd42 79
f4eb07c1 80struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
1da177e4 81volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
c9e37353 82static unsigned long __initdata memory_end;
1da177e4 83
1da177e4
LT		 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
1da177e4
LT		 92static struct resource code_resource = {
93 .name = "Kernel code",
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
95};
96
97static 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 */
105void __devinit 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 */
72960a02 112 get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
1da177e4
LT		 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 * VM halt and poweroff setup routines
130 */
131char vmhalt_cmd[128] = "";
132char vmpoff_cmd[128] = "";
2b67fc46 133static char vmpanic_cmd[128] = "";
1da177e4 134
4d284cac 135static void strncpy_skip_quote(char *dst, char *src, int n)
1da177e4
LT		 136{
137 int sx, dx;
138
139 dx = 0;
140 for (sx = 0; src[sx] != 0; sx++) {
141 if (src[sx] == '"') continue;
142 dst[dx++] = src[sx];
143 if (dx >= n) break;
144 }
145}
146
147static int __init vmhalt_setup(char *str)
148{
149 strncpy_skip_quote(vmhalt_cmd, str, 127);
150 vmhalt_cmd[127] = 0;
151 return 1;
152}
153
154__setup("vmhalt=", vmhalt_setup);
155
156static int __init vmpoff_setup(char *str)
157{
158 strncpy_skip_quote(vmpoff_cmd, str, 127);
159 vmpoff_cmd[127] = 0;
160 return 1;
161}
162
163__setup("vmpoff=", vmpoff_setup);
164
585c3047
PO		 165static int vmpanic_notify(struct notifier_block *self, unsigned long event,
166 void *data)
167{
168 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
169 cpcmd(vmpanic_cmd, NULL, 0, NULL);
170
171 return NOTIFY_OK;
172}
173
174#define PANIC_PRI_VMPANIC 0
175
176static struct notifier_block vmpanic_nb = {
177 .notifier_call = vmpanic_notify,
178 .priority = PANIC_PRI_VMPANIC
179};
180
181static int __init vmpanic_setup(char *str)
182{
183 static int register_done __initdata = 0;
184
185 strncpy_skip_quote(vmpanic_cmd, str, 127);
186 vmpanic_cmd[127] = 0;
187 if (!register_done) {
188 register_done = 1;
189 atomic_notifier_chain_register(&panic_notifier_list,
190 &vmpanic_nb);
191 }
192 return 1;
193}
194
195__setup("vmpanic=", vmpanic_setup);
196
1da177e4
LT		 197/*
198 * condev= and conmode= setup parameter.
199 */
200
201static int __init condev_setup(char *str)
202{
203 int vdev;
204
205 vdev = simple_strtoul(str, &str, 0);
206 if (vdev >= 0 && vdev < 65536) {
207 console_devno = vdev;
208 console_irq = -1;
209 }
210 return 1;
211}
212
213__setup("condev=", condev_setup);
214
215static int __init conmode_setup(char *str)
216{
217#if defined(CONFIG_SCLP_CONSOLE)
218 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
219 SET_CONSOLE_SCLP;
220#endif
221#if defined(CONFIG_TN3215_CONSOLE)
222 if (strncmp(str, "3215", 5) == 0)
223 SET_CONSOLE_3215;
224#endif
225#if defined(CONFIG_TN3270_CONSOLE)
226 if (strncmp(str, "3270", 5) == 0)
227 SET_CONSOLE_3270;
228#endif
229 return 1;
230}
231
232__setup("conmode=", conmode_setup);
233
234static void __init conmode_default(void)
235{
236 char query_buffer[1024];
237 char *ptr;
238
239 if (MACHINE_IS_VM) {
740b5706 240 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
1da177e4
LT		 241 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
242 ptr = strstr(query_buffer, "SUBCHANNEL =");
243 console_irq = simple_strtoul(ptr + 13, NULL, 16);
740b5706 244 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
1da177e4
LT		 245 ptr = strstr(query_buffer, "CONMODE");
246 /*
247 * Set the conmode to 3215 so that the device recognition
248 * will set the cu_type of the console to 3215. If the
249 * conmode is 3270 and we don't set it back then both
250 * 3215 and the 3270 driver will try to access the console
251 * device (3215 as console and 3270 as normal tty).
252 */
740b5706 253 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
1da177e4
LT		 254 if (ptr == NULL) {
255#if defined(CONFIG_SCLP_CONSOLE)
256 SET_CONSOLE_SCLP;
257#endif
258 return;
259 }
260 if (strncmp(ptr + 8, "3270", 4) == 0) {
261#if defined(CONFIG_TN3270_CONSOLE)
262 SET_CONSOLE_3270;
263#elif defined(CONFIG_TN3215_CONSOLE)
264 SET_CONSOLE_3215;
265#elif defined(CONFIG_SCLP_CONSOLE)
266 SET_CONSOLE_SCLP;
267#endif
268 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
269#if defined(CONFIG_TN3215_CONSOLE)
270 SET_CONSOLE_3215;
271#elif defined(CONFIG_TN3270_CONSOLE)
272 SET_CONSOLE_3270;
273#elif defined(CONFIG_SCLP_CONSOLE)
274 SET_CONSOLE_SCLP;
275#endif
276 }
277 } else if (MACHINE_IS_P390) {
278#if defined(CONFIG_TN3215_CONSOLE)
279 SET_CONSOLE_3215;
280#elif defined(CONFIG_TN3270_CONSOLE)
281 SET_CONSOLE_3270;
282#endif
283 } else {
284#if defined(CONFIG_SCLP_CONSOLE)
285 SET_CONSOLE_SCLP;
286#endif
287 }
288}
289
411ed322
MH		 290#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
291static void __init setup_zfcpdump(unsigned int console_devno)
292{
293 static char str[64];
294
295 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
296 return;
297 if (console_devno != -1)
298 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
299 ipl_info.data.fcp.dev_id.devno, console_devno);
300 else
301 sprintf(str, "cio_ignore=all,!0.0.%04x",
302 ipl_info.data.fcp.dev_id.devno);
303 strcat(COMMAND_LINE, str);
304 console_loglevel = 2;
305}
306#else
307static inline void setup_zfcpdump(unsigned int console_devno) {}
308#endif /* CONFIG_ZFCPDUMP */
309
1da177e4 310#ifdef CONFIG_SMP
1da177e4
LT		 311void (*_machine_restart)(char *command) = machine_restart_smp;
312void (*_machine_halt)(void) = machine_halt_smp;
313void (*_machine_power_off)(void) = machine_power_off_smp;
314#else
315/*
316 * Reboot, halt and power_off routines for non SMP.
317 */
1da177e4
LT		 318static void do_machine_restart_nonsmp(char * __unused)
319{
ff6b8ea6 320 do_reipl();
1da177e4
LT		 321}
322
323static void do_machine_halt_nonsmp(void)
324{
325 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
740b5706 326 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
1da177e4
LT		 327 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
328}
329
330static void do_machine_power_off_nonsmp(void)
331{
332 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
740b5706 333 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
1da177e4
LT		 334 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
335}
336
337void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
338void (*_machine_halt)(void) = do_machine_halt_nonsmp;
339void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
340#endif
341
342 /*
343 * Reboot, halt and power_off stubs. They just call _machine_restart,
344 * _machine_halt or _machine_power_off.
345 */
346
347void machine_restart(char *command)
348{
06fa46a2
MS		 349 if (!in_interrupt() || oops_in_progress)
350 /*
351 * Only unblank the console if we are called in enabled
352 * context or a bust_spinlocks cleared the way for us.
353 */
354 console_unblank();
1da177e4
LT		 355 _machine_restart(command);
356}
357
1da177e4
LT		 358void machine_halt(void)
359{
06fa46a2
MS		 360 if (!in_interrupt() || oops_in_progress)
361 /*
362 * Only unblank the console if we are called in enabled
363 * context or a bust_spinlocks cleared the way for us.
364 */
365 console_unblank();
1da177e4
LT		 366 _machine_halt();
367}
368
1da177e4
LT		 369void machine_power_off(void)
370{
06fa46a2
MS		 371 if (!in_interrupt() || oops_in_progress)
372 /*
373 * Only unblank the console if we are called in enabled
374 * context or a bust_spinlocks cleared the way for us.
375 */
376 console_unblank();
1da177e4
LT		 377 _machine_power_off();
378}
379
53df751c
MS		 380/*
381 * Dummy power off function.
382 */
383void (*pm_power_off)(void) = machine_power_off;
384
59685296
HC		 385static int __init early_parse_mem(char *p)
386{
387 memory_end = memparse(p, &p);
388 return 0;
389}
390early_param("mem", early_parse_mem);
391
392/*
393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
394 */
395static int __init early_parse_ipldelay(char *p)
c9e37353 396{
c9e37353 397 unsigned long delay = 0;
1da177e4 398
59685296 399 delay = simple_strtoul(p, &p, 0);
1da177e4 400
59685296
HC		 401 switch (*p) {
402 case 's':
403 case 'S':
404 delay *= 1000000;
405 break;
406 case 'm':
407 case 'M':
408 delay *= 60 * 1000000;
c9e37353 409 }
59685296
HC		 410
411 /* now wait for the requested amount of time */
412 udelay(delay);
413
414 return 0;
c9e37353 415}
59685296 416early_param("ipldelay", early_parse_ipldelay);
c9e37353 417
c1821c2e
GS		 418#ifdef CONFIG_S390_SWITCH_AMODE
419unsigned int switch_amode = 0;
420EXPORT_SYMBOL_GPL(switch_amode);
421
4d284cac
HC		 422static void set_amode_and_uaccess(unsigned long user_amode,
423 unsigned long user32_amode)
c1821c2e
GS		 424{
425 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
426 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
427 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
428#ifdef CONFIG_COMPAT
429 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
430 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
431 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
432 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
433 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
434 PSW32_MASK_PSTATE;
435#endif
436 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
437 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
438
439 if (MACHINE_HAS_MVCOS) {
440 printk("mvcos available.\n");
441 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
442 } else {
443 printk("mvcos not available.\n");
444 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
445 }
446}
447
448/*
449 * Switch kernel/user addressing modes?
450 */
451static int __init early_parse_switch_amode(char *p)
452{
453 switch_amode = 1;
454 return 0;
455}
456early_param("switch_amode", early_parse_switch_amode);
457
458#else /* CONFIG_S390_SWITCH_AMODE */
459static inline void set_amode_and_uaccess(unsigned long user_amode,
460 unsigned long user32_amode)
461{
462}
463#endif /* CONFIG_S390_SWITCH_AMODE */
464
465#ifdef CONFIG_S390_EXEC_PROTECT
466unsigned int s390_noexec = 0;
467EXPORT_SYMBOL_GPL(s390_noexec);
468
469/*
470 * Enable execute protection?
471 */
472static int __init early_parse_noexec(char *p)
473{
474 if (!strncmp(p, "off", 3))
475 return 0;
476 switch_amode = 1;
477 s390_noexec = 1;
478 return 0;
479}
480early_param("noexec", early_parse_noexec);
481#endif /* CONFIG_S390_EXEC_PROTECT */
482
483static void setup_addressing_mode(void)
484{
485 if (s390_noexec) {
486 printk("S390 execute protection active, ");
487 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
488 return;
489 }
490 if (switch_amode) {
491 printk("S390 address spaces switched, ");
492 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
493 }
494}
495
c9e37353
HC		 496static void __init
497setup_lowcore(void)
498{
499 struct _lowcore *lc;
500 int lc_pages;
501
502 /*
503 * Setup lowcore for boot cpu
504 */
505 lc_pages = sizeof(void *) == 8 ? 2 : 1;
506 lc = (struct _lowcore *)
507 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
508 memset(lc, 0, lc_pages * PAGE_SIZE);
0b642ede 509 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
c9e37353
HC		 510 lc->restart_psw.addr =
511 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
c1821c2e
GS		 512 if (switch_amode)
513 lc->restart_psw.mask |= PSW_ASC_HOME;
514 lc->external_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 515 lc->external_new_psw.addr =
516 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
c1821c2e 517 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
c9e37353 518 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
c1821c2e 519 lc->program_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 520 lc->program_new_psw.addr =
521 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
77fa2245 522 lc->mcck_new_psw.mask =
c1821c2e 523 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
c9e37353
HC		 524 lc->mcck_new_psw.addr =
525 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
c1821c2e 526 lc->io_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 527 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
528 lc->ipl_device = S390_lowcore.ipl_device;
529 lc->jiffy_timer = -1LL;
530 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
531 lc->async_stack = (unsigned long)
532 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
c9e37353
HC		 533 lc->panic_stack = (unsigned long)
534 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
c9e37353
HC		 535 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
536 lc->thread_info = (unsigned long) &init_thread_union;
347a8dc3 537#ifndef CONFIG_64BIT
77fa2245
HC		 538 if (MACHINE_HAS_IEEE) {
539 lc->extended_save_area_addr = (__u32)
540 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
541 /* enable extended save area */
c4972f33 542 __ctl_set_bit(14, 29);
77fa2245
HC		 543 }
544#endif
c9e37353
HC		 545 set_prefix((u32)(unsigned long) lc);
546}
547
548static void __init
549setup_resources(void)
550{
fe355b7f 551 struct resource *res, *sub_res;
c9e37353
HC		 552 int i;
553
cc13ad62
HC		 554 code_resource.start = (unsigned long) &_text;
555 code_resource.end = (unsigned long) &_etext - 1;
556 data_resource.start = (unsigned long) &_etext;
557 data_resource.end = (unsigned long) &_edata - 1;
558
c9e37353
HC		 559 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
560 res = alloc_bootmem_low(sizeof(struct resource));
561 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
562 switch (memory_chunk[i].type) {
563 case CHUNK_READ_WRITE:
564 res->name = "System RAM";
565 break;
566 case CHUNK_READ_ONLY:
567 res->name = "System ROM";
568 res->flags |= IORESOURCE_READONLY;
569 break;
570 default:
571 res->name = "reserved";
572 }
573 res->start = memory_chunk[i].addr;
574 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
575 request_resource(&iomem_resource, res);
fe355b7f
HY		 576
577 if (code_resource.start >= res->start &&
578 code_resource.start <= res->end &&
579 code_resource.end > res->end) {
580 sub_res = alloc_bootmem_low(sizeof(struct resource));
581 memcpy(sub_res, &code_resource,
582 sizeof(struct resource));
583 sub_res->end = res->end;
584 code_resource.start = res->end + 1;
585 request_resource(res, sub_res);
586 }
587
588 if (code_resource.start >= res->start &&
589 code_resource.start <= res->end &&
590 code_resource.end <= res->end)
591 request_resource(res, &code_resource);
592
593 if (data_resource.start >= res->start &&
594 data_resource.start <= res->end &&
595 data_resource.end > res->end) {
596 sub_res = alloc_bootmem_low(sizeof(struct resource));
597 memcpy(sub_res, &data_resource,
598 sizeof(struct resource));
599 sub_res->end = res->end;
600 data_resource.start = res->end + 1;
601 request_resource(res, sub_res);
602 }
603
604 if (data_resource.start >= res->start &&
605 data_resource.start <= res->end &&
606 data_resource.end <= res->end)
607 request_resource(res, &data_resource);
c9e37353
HC		 608 }
609}
610
411ed322
MH		 611unsigned long real_memory_size;
612EXPORT_SYMBOL_GPL(real_memory_size);
613
8b62bc96
HC		 614static void __init setup_memory_end(void)
615{
411ed322 616 unsigned long memory_size;
8b62bc96
HC		 617 unsigned long max_mem, max_phys;
618 int i;
619
411ed322
MH		 620#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
621 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
622 memory_end = ZFCPDUMP_HSA_SIZE;
623#endif
624 memory_size = 0;
de338a37 625 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
8b62bc96
HC		 626 memory_end &= PAGE_MASK;
627
628 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
629
630 for (i = 0; i < MEMORY_CHUNKS; i++) {
631 struct mem_chunk *chunk = &memory_chunk[i];
632
411ed322
MH		 633 real_memory_size = max(real_memory_size,
634 chunk->addr + chunk->size);
8b62bc96
HC		 635 if (chunk->addr >= max_mem) {
636 memset(chunk, 0, sizeof(*chunk));
637 continue;
638 }
639 if (chunk->addr + chunk->size > max_mem)
640 chunk->size = max_mem - chunk->addr;
641 memory_size = max(memory_size, chunk->addr + chunk->size);
642 }
643 if (!memory_end)
644 memory_end = memory_size;
8b62bc96
HC		 645}
646
c9e37353
HC		 647static void __init
648setup_memory(void)
649{
650 unsigned long bootmap_size;
fe355b7f 651 unsigned long start_pfn, end_pfn;
c9e37353 652 int i;
1da177e4
LT		 653
654 /*
655 * partially used pages are not usable - thus
656 * we are rounding upwards:
657 */
65912a84
HC		 658 start_pfn = PFN_UP(__pa(&_end));
659 end_pfn = max_pfn = PFN_DOWN(memory_end);
1da177e4 660
65912a84
HC		 661#ifdef CONFIG_BLK_DEV_INITRD
662 /*
663 * Move the initrd in case the bitmap of the bootmem allocater
664 * would overwrite it.
665 */
666
667 if (INITRD_START && INITRD_SIZE) {
668 unsigned long bmap_size;
669 unsigned long start;
670
671 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
672 bmap_size = PFN_PHYS(bmap_size);
673
674 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
675 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
676
677 if (start + INITRD_SIZE > memory_end) {
678 printk("initrd extends beyond end of memory "
679 "(0x%08lx > 0x%08lx)\n"
680 "disabling initrd\n",
681 start + INITRD_SIZE, memory_end);
682 INITRD_START = INITRD_SIZE = 0;
683 } else {
684 printk("Moving initrd (0x%08lx -> 0x%08lx, "
685 "size: %ld)\n",
686 INITRD_START, start, INITRD_SIZE);
687 memmove((void *) start, (void *) INITRD_START,
688 INITRD_SIZE);
689 INITRD_START = start;
690 }
691 }
692 }
693#endif
694
1da177e4 695 /*
7676bef9 696 * Initialize the boot-time allocator
1da177e4
LT		 697 */
698 bootmap_size = init_bootmem(start_pfn, end_pfn);
699
700 /*
701 * Register RAM areas with the bootmem allocator.
702 */
c9e37353 703
0b642ede 704 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
39b742f9 705 unsigned long start_chunk, end_chunk, pfn;
1da177e4
LT		 706
707 if (memory_chunk[i].type != CHUNK_READ_WRITE)
708 continue;
39b742f9
HC		 709 start_chunk = PFN_DOWN(memory_chunk[i].addr);
710 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
711 end_chunk = min(end_chunk, end_pfn);
712 if (start_chunk >= end_chunk)
713 continue;
714 add_active_range(0, start_chunk, end_chunk);
715 pfn = max(start_chunk, start_pfn);
716 for (; pfn <= end_chunk; pfn++)
717 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
1da177e4
LT		 718 }
719
0b642ede
PO		 720 psw_set_key(PAGE_DEFAULT_KEY);
721
39b742f9 722 free_bootmem_with_active_regions(0, max_pfn);
c9e37353 723
615b04b3
HC		 724 /*
725 * Reserve memory used for lowcore/command line/kernel image.
726 */
727 reserve_bootmem(0, (unsigned long)_ehead);
728 reserve_bootmem((unsigned long)_stext,
729 PFN_PHYS(start_pfn) - (unsigned long)_stext);
c9e37353
HC		 730 /*
731 * Reserve the bootmem bitmap itself as well. We do this in two
732 * steps (first step was init_bootmem()) because this catches
733 * the (very unlikely) case of us accidentally initializing the
734 * bootmem allocator with an invalid RAM area.
735 */
736 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
1da177e4
LT		 737
738#ifdef CONFIG_BLK_DEV_INITRD
65912a84 739 if (INITRD_START && INITRD_SIZE) {
1da177e4
LT		 740 if (INITRD_START + INITRD_SIZE <= memory_end) {
741 reserve_bootmem(INITRD_START, INITRD_SIZE);
742 initrd_start = INITRD_START;
743 initrd_end = initrd_start + INITRD_SIZE;
744 } else {
c9e37353
HC		 745 printk("initrd extends beyond end of memory "
746 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
747 initrd_start + INITRD_SIZE, memory_end);
748 initrd_start = initrd_end = 0;
1da177e4 749 }
c9e37353 750 }
1da177e4 751#endif
c9e37353 752}
1da177e4 753
cf8ba7a9
MS		 754static __init unsigned int stfl(void)
755{
756 asm volatile(
757 " .insn s,0xb2b10000,0(0)\n" /* stfl */
758 "0:\n"
759 EX_TABLE(0b,0b));
760 return S390_lowcore.stfl_fac_list;
761}
762
763static __init int stfle(unsigned long long *list, int doublewords)
764{
765 typedef struct { unsigned long long _[doublewords]; } addrtype;
766 register unsigned long __nr asm("0") = doublewords - 1;
767
768 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
769 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
770 return __nr + 1;
771}
772
773/*
774 * Setup hardware capabilities.
775 */
776static void __init setup_hwcaps(void)
777{
778 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
779 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
780 unsigned long long facility_list_extended;
781 unsigned int facility_list;
782 int i;
783
784 facility_list = stfl();
785 /*
786 * The store facility list bits numbers as found in the principles
787 * of operation are numbered with bit 1UL<<31 as number 0 to
788 * bit 1UL<<0 as number 31.
789 * Bit 0: instructions named N3, "backported" to esa-mode
790 * Bit 2: z/Architecture mode is active
791 * Bit 7: the store-facility-list-extended facility is installed
792 * Bit 17: the message-security assist is installed
793 * Bit 19: the long-displacement facility is installed
794 * Bit 21: the extended-immediate facility is installed
795 * These get translated to:
796 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
797 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
798 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
799 */
800 for (i = 0; i < 6; i++)
801 if (facility_list & (1UL << (31 - stfl_bits[i])))
802 elf_hwcap |= 1UL << i;
803
804 /*
805 * Check for additional facilities with store-facility-list-extended.
806 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
807 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
808 * as stored by stfl, bits 32-xxx contain additional facilities.
809 * How many facility words are stored depends on the number of
810 * doublewords passed to the instruction. The additional facilites
811 * are:
812 * Bit 43: decimal floating point facility is installed
813 * translated to:
814 * HWCAP_S390_DFP bit 6.
815 */
816 if ((elf_hwcap & (1UL << 2)) &&
817 stfle(&facility_list_extended, 1) > 0) {
818 if (facility_list_extended & (1ULL << (64 - 43)))
819 elf_hwcap |= 1UL << 6;
820 }
821
822 switch (cpuinfo->cpu_id.machine) {
823 case 0x9672:
824#if !defined(CONFIG_64BIT)
825 default: /* Use "g5" as default for 31 bit kernels. */
826#endif
827 strcpy(elf_platform, "g5");
828 break;
829 case 0x2064:
830 case 0x2066:
831#if defined(CONFIG_64BIT)
832 default: /* Use "z900" as default for 64 bit kernels. */
833#endif
834 strcpy(elf_platform, "z900");
835 break;
836 case 0x2084:
837 case 0x2086:
838 strcpy(elf_platform, "z990");
839 break;
840 case 0x2094:
841 strcpy(elf_platform, "z9-109");
842 break;
843 }
844}
845
c9e37353
HC		 846/*
847 * Setup function called from init/main.c just after the banner
848 * was printed.
849 */
1da177e4 850
c9e37353
HC		 851void __init
852setup_arch(char **cmdline_p)
853{
1da177e4 854 /*
c9e37353 855 * print what head.S has found out about the machine
1da177e4 856 */
347a8dc3 857#ifndef CONFIG_64BIT
c9e37353
HC		 858 printk((MACHINE_IS_VM) ?
859 "We are running under VM (31 bit mode)\n" :
860 "We are running native (31 bit mode)\n");
861 printk((MACHINE_HAS_IEEE) ?
862 "This machine has an IEEE fpu\n" :
863 "This machine has no IEEE fpu\n");
347a8dc3 864#else /* CONFIG_64BIT */
c9e37353
HC		 865 printk((MACHINE_IS_VM) ?
866 "We are running under VM (64 bit mode)\n" :
867 "We are running native (64 bit mode)\n");
347a8dc3 868#endif /* CONFIG_64BIT */
c9e37353 869
59685296 870 /* Save unparsed command line copy for /proc/cmdline */
e06b1a35 871 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
59685296
HC		 872
873 *cmdline_p = COMMAND_LINE;
874 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
875
c9e37353 876 ROOT_DEV = Root_RAM0;
59685296
HC		 877
878 init_mm.start_code = PAGE_OFFSET;
879 init_mm.end_code = (unsigned long) &_etext;
880 init_mm.end_data = (unsigned long) &_edata;
881 init_mm.brk = (unsigned long) &_end;
882
6c2a9e6d
GS		 883 if (MACHINE_HAS_MVCOS)
884 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
885 else
886 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
887
59685296
HC		 888 parse_early_param();
889
411ed322 890 setup_ipl_info();
8b62bc96 891 setup_memory_end();
c1821c2e 892 setup_addressing_mode();
c9e37353
HC		 893 setup_memory();
894 setup_resources();
895 setup_lowcore();
896
1da177e4
LT		 897 cpu_init();
898 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
255acee7 899 smp_setup_cpu_possible_map();
1da177e4 900
cf8ba7a9
MS		 901 /*
902 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
903 */
904 setup_hwcaps();
905
1da177e4
LT		 906 /*
907 * Create kernel page tables and switch to virtual addressing.
908 */
909 paging_init();
910
911 /* Setup default console */
912 conmode_default();
411ed322
MH		 913
914 /* Setup zfcpdump support */
915 setup_zfcpdump(console_devno);
1da177e4
LT		 916}
917
918void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
919{
920 printk("cpu %d "
921#ifdef CONFIG_SMP
922 "phys_idx=%d "
923#endif
924 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
925 cpuinfo->cpu_nr,
926#ifdef CONFIG_SMP
927 cpuinfo->cpu_addr,
928#endif
929 cpuinfo->cpu_id.version,
930 cpuinfo->cpu_id.ident,
931 cpuinfo->cpu_id.machine,
932 cpuinfo->cpu_id.unused);
933}
934
935/*
936 * show_cpuinfo - Get information on one CPU for use by procfs.
937 */
938
939static int show_cpuinfo(struct seq_file *m, void *v)
940{
cf8ba7a9
MS		 941 static const char *hwcap_str[7] = {
942 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
943 };
1da177e4
LT		 944 struct cpuinfo_S390 *cpuinfo;
945 unsigned long n = (unsigned long) v - 1;
cf8ba7a9 946 int i;
1da177e4 947
31ee4b2f 948 s390_adjust_jiffies();
b7ae9dd8 949 preempt_disable();
1da177e4
LT		 950 if (!n) {
951 seq_printf(m, "vendor_id : IBM/S390\n"
952 "# processors : %i\n"
953 "bogomips per cpu: %lu.%02lu\n",
954 num_online_cpus(), loops_per_jiffy/(500000/HZ),
955 (loops_per_jiffy/(5000/HZ))%100);
cf8ba7a9
MS		 956 seq_puts(m, "features\t: ");
957 for (i = 0; i < 7; i++)
958 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
959 seq_printf(m, "%s ", hwcap_str[i]);
960 seq_puts(m, "\n");
1da177e4 961 }
cf8ba7a9 962
1da177e4
LT		 963 if (cpu_online(n)) {
964#ifdef CONFIG_SMP
965 if (smp_processor_id() == n)
966 cpuinfo = &S390_lowcore.cpu_data;
967 else
968 cpuinfo = &lowcore_ptr[n]->cpu_data;
969#else
970 cpuinfo = &S390_lowcore.cpu_data;
971#endif
972 seq_printf(m, "processor %li: "
973 "version = %02X, "
974 "identification = %06X, "
975 "machine = %04X\n",
976 n, cpuinfo->cpu_id.version,
977 cpuinfo->cpu_id.ident,
978 cpuinfo->cpu_id.machine);
979 }
b7ae9dd8 980 preempt_enable();
1da177e4
LT		 981 return 0;
982}
983
984static void *c_start(struct seq_file *m, loff_t *pos)
985{
986 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
987}
988static void *c_next(struct seq_file *m, void *v, loff_t *pos)
989{
990 ++*pos;
991 return c_start(m, pos);
992}
993static void c_stop(struct seq_file *m, void *v)
994{
995}
996struct seq_operations cpuinfo_op = {
997 .start = c_start,
998 .next = c_next,
999 .stop = c_stop,
1000 .show = show_cpuinfo,
1001};
1002
kernel source for telekom puls (alcatel/mediatek)