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Pull misc into release branch
[linux-2.6-block.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 */
ea1f4eec 105void __cpuinit cpu_init(void)
1da177e4
LT		 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);
0a71a312 303 strcat(COMMAND_LINE, " ");
411ed322
MH		 304 strcat(COMMAND_LINE, str);
305 console_loglevel = 2;
306}
307#else
308static inline void setup_zfcpdump(unsigned int console_devno) {}
309#endif /* CONFIG_ZFCPDUMP */
310
1da177e4 311#ifdef CONFIG_SMP
1da177e4
LT		 312void (*_machine_restart)(char *command) = machine_restart_smp;
313void (*_machine_halt)(void) = machine_halt_smp;
314void (*_machine_power_off)(void) = machine_power_off_smp;
315#else
316/*
317 * Reboot, halt and power_off routines for non SMP.
318 */
1da177e4
LT		 319static void do_machine_restart_nonsmp(char * __unused)
320{
ff6b8ea6 321 do_reipl();
1da177e4
LT		 322}
323
324static void do_machine_halt_nonsmp(void)
325{
326 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
740b5706 327 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
1da177e4
LT		 328 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
329}
330
331static void do_machine_power_off_nonsmp(void)
332{
333 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
740b5706 334 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
1da177e4
LT		 335 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
336}
337
338void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
339void (*_machine_halt)(void) = do_machine_halt_nonsmp;
340void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
341#endif
342
343 /*
344 * Reboot, halt and power_off stubs. They just call _machine_restart,
345 * _machine_halt or _machine_power_off.
346 */
347
348void machine_restart(char *command)
349{
06fa46a2
MS		 350 if (!in_interrupt() || oops_in_progress)
351 /*
352 * Only unblank the console if we are called in enabled
353 * context or a bust_spinlocks cleared the way for us.
354 */
355 console_unblank();
1da177e4
LT		 356 _machine_restart(command);
357}
358
1da177e4
LT		 359void machine_halt(void)
360{
06fa46a2
MS		 361 if (!in_interrupt() || oops_in_progress)
362 /*
363 * Only unblank the console if we are called in enabled
364 * context or a bust_spinlocks cleared the way for us.
365 */
366 console_unblank();
1da177e4
LT		 367 _machine_halt();
368}
369
1da177e4
LT		 370void machine_power_off(void)
371{
06fa46a2
MS		 372 if (!in_interrupt() || oops_in_progress)
373 /*
374 * Only unblank the console if we are called in enabled
375 * context or a bust_spinlocks cleared the way for us.
376 */
377 console_unblank();
1da177e4
LT		 378 _machine_power_off();
379}
380
53df751c
MS		 381/*
382 * Dummy power off function.
383 */
384void (*pm_power_off)(void) = machine_power_off;
385
59685296
HC		 386static int __init early_parse_mem(char *p)
387{
388 memory_end = memparse(p, &p);
389 return 0;
390}
391early_param("mem", early_parse_mem);
392
393/*
394 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
395 */
396static int __init early_parse_ipldelay(char *p)
c9e37353 397{
c9e37353 398 unsigned long delay = 0;
1da177e4 399
59685296 400 delay = simple_strtoul(p, &p, 0);
1da177e4 401
59685296
HC		 402 switch (*p) {
403 case 's':
404 case 'S':
405 delay *= 1000000;
406 break;
407 case 'm':
408 case 'M':
409 delay *= 60 * 1000000;
c9e37353 410 }
59685296
HC		 411
412 /* now wait for the requested amount of time */
413 udelay(delay);
414
415 return 0;
c9e37353 416}
59685296 417early_param("ipldelay", early_parse_ipldelay);
c9e37353 418
c1821c2e
GS		 419#ifdef CONFIG_S390_SWITCH_AMODE
420unsigned int switch_amode = 0;
421EXPORT_SYMBOL_GPL(switch_amode);
422
4d284cac
HC		 423static void set_amode_and_uaccess(unsigned long user_amode,
424 unsigned long user32_amode)
c1821c2e
GS		 425{
426 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
427 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
428 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
429#ifdef CONFIG_COMPAT
430 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
431 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
432 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
433 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
434 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
435 PSW32_MASK_PSTATE;
436#endif
437 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
438 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
439
440 if (MACHINE_HAS_MVCOS) {
441 printk("mvcos available.\n");
442 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
443 } else {
444 printk("mvcos not available.\n");
445 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
446 }
447}
448
449/*
450 * Switch kernel/user addressing modes?
451 */
452static int __init early_parse_switch_amode(char *p)
453{
454 switch_amode = 1;
455 return 0;
456}
457early_param("switch_amode", early_parse_switch_amode);
458
459#else /* CONFIG_S390_SWITCH_AMODE */
460static inline void set_amode_and_uaccess(unsigned long user_amode,
461 unsigned long user32_amode)
462{
463}
464#endif /* CONFIG_S390_SWITCH_AMODE */
465
466#ifdef CONFIG_S390_EXEC_PROTECT
467unsigned int s390_noexec = 0;
468EXPORT_SYMBOL_GPL(s390_noexec);
469
470/*
471 * Enable execute protection?
472 */
473static int __init early_parse_noexec(char *p)
474{
475 if (!strncmp(p, "off", 3))
476 return 0;
477 switch_amode = 1;
478 s390_noexec = 1;
479 return 0;
480}
481early_param("noexec", early_parse_noexec);
482#endif /* CONFIG_S390_EXEC_PROTECT */
483
484static void setup_addressing_mode(void)
485{
486 if (s390_noexec) {
487 printk("S390 execute protection active, ");
488 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
489 return;
490 }
491 if (switch_amode) {
492 printk("S390 address spaces switched, ");
493 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
494 }
495}
496
c9e37353
HC		 497static void __init
498setup_lowcore(void)
499{
500 struct _lowcore *lc;
501 int lc_pages;
502
503 /*
504 * Setup lowcore for boot cpu
505 */
506 lc_pages = sizeof(void *) == 8 ? 2 : 1;
507 lc = (struct _lowcore *)
508 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
509 memset(lc, 0, lc_pages * PAGE_SIZE);
0b642ede 510 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
c9e37353
HC		 511 lc->restart_psw.addr =
512 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
c1821c2e
GS		 513 if (switch_amode)
514 lc->restart_psw.mask |= PSW_ASC_HOME;
515 lc->external_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 516 lc->external_new_psw.addr =
517 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
c1821c2e 518 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
c9e37353 519 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
c1821c2e 520 lc->program_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 521 lc->program_new_psw.addr =
522 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
77fa2245 523 lc->mcck_new_psw.mask =
c1821c2e 524 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
c9e37353
HC		 525 lc->mcck_new_psw.addr =
526 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
c1821c2e 527 lc->io_new_psw.mask = psw_kernel_bits;
c9e37353
HC		 528 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
529 lc->ipl_device = S390_lowcore.ipl_device;
530 lc->jiffy_timer = -1LL;
531 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
532 lc->async_stack = (unsigned long)
533 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
c9e37353
HC		 534 lc->panic_stack = (unsigned long)
535 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
c9e37353
HC		 536 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
537 lc->thread_info = (unsigned long) &init_thread_union;
347a8dc3 538#ifndef CONFIG_64BIT
77fa2245
HC		 539 if (MACHINE_HAS_IEEE) {
540 lc->extended_save_area_addr = (__u32)
541 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
542 /* enable extended save area */
c4972f33 543 __ctl_set_bit(14, 29);
77fa2245
HC		 544 }
545#endif
c9e37353
HC		 546 set_prefix((u32)(unsigned long) lc);
547}
548
549static void __init
550setup_resources(void)
551{
fe355b7f 552 struct resource *res, *sub_res;
c9e37353
HC		 553 int i;
554
cc13ad62
HC		 555 code_resource.start = (unsigned long) &_text;
556 code_resource.end = (unsigned long) &_etext - 1;
557 data_resource.start = (unsigned long) &_etext;
558 data_resource.end = (unsigned long) &_edata - 1;
559
c9e37353
HC		 560 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
561 res = alloc_bootmem_low(sizeof(struct resource));
562 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
563 switch (memory_chunk[i].type) {
564 case CHUNK_READ_WRITE:
565 res->name = "System RAM";
566 break;
567 case CHUNK_READ_ONLY:
568 res->name = "System ROM";
569 res->flags |= IORESOURCE_READONLY;
570 break;
571 default:
572 res->name = "reserved";
573 }
574 res->start = memory_chunk[i].addr;
575 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
576 request_resource(&iomem_resource, res);
fe355b7f
HY		 577
578 if (code_resource.start >= res->start &&
579 code_resource.start <= res->end &&
580 code_resource.end > res->end) {
581 sub_res = alloc_bootmem_low(sizeof(struct resource));
582 memcpy(sub_res, &code_resource,
583 sizeof(struct resource));
584 sub_res->end = res->end;
585 code_resource.start = res->end + 1;
586 request_resource(res, sub_res);
587 }
588
589 if (code_resource.start >= res->start &&
590 code_resource.start <= res->end &&
591 code_resource.end <= res->end)
592 request_resource(res, &code_resource);
593
594 if (data_resource.start >= res->start &&
595 data_resource.start <= res->end &&
596 data_resource.end > res->end) {
597 sub_res = alloc_bootmem_low(sizeof(struct resource));
598 memcpy(sub_res, &data_resource,
599 sizeof(struct resource));
600 sub_res->end = res->end;
601 data_resource.start = res->end + 1;
602 request_resource(res, sub_res);
603 }
604
605 if (data_resource.start >= res->start &&
606 data_resource.start <= res->end &&
607 data_resource.end <= res->end)
608 request_resource(res, &data_resource);
c9e37353
HC		 609 }
610}
611
411ed322
MH		 612unsigned long real_memory_size;
613EXPORT_SYMBOL_GPL(real_memory_size);
614
8b62bc96
HC		 615static void __init setup_memory_end(void)
616{
411ed322 617 unsigned long memory_size;
8b62bc96
HC		 618 unsigned long max_mem, max_phys;
619 int i;
620
411ed322
MH		 621#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
622 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
623 memory_end = ZFCPDUMP_HSA_SIZE;
624#endif
625 memory_size = 0;
de338a37 626 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
8b62bc96
HC		 627 memory_end &= PAGE_MASK;
628
629 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
630
631 for (i = 0; i < MEMORY_CHUNKS; i++) {
632 struct mem_chunk *chunk = &memory_chunk[i];
633
411ed322
MH		 634 real_memory_size = max(real_memory_size,
635 chunk->addr + chunk->size);
8b62bc96
HC		 636 if (chunk->addr >= max_mem) {
637 memset(chunk, 0, sizeof(*chunk));
638 continue;
639 }
640 if (chunk->addr + chunk->size > max_mem)
641 chunk->size = max_mem - chunk->addr;
642 memory_size = max(memory_size, chunk->addr + chunk->size);
643 }
644 if (!memory_end)
645 memory_end = memory_size;
8b62bc96
HC		 646}
647
c9e37353
HC		 648static void __init
649setup_memory(void)
650{
651 unsigned long bootmap_size;
fe355b7f 652 unsigned long start_pfn, end_pfn;
c9e37353 653 int i;
1da177e4
LT		 654
655 /*
656 * partially used pages are not usable - thus
657 * we are rounding upwards:
658 */
65912a84
HC		 659 start_pfn = PFN_UP(__pa(&_end));
660 end_pfn = max_pfn = PFN_DOWN(memory_end);
1da177e4 661
65912a84
HC		 662#ifdef CONFIG_BLK_DEV_INITRD
663 /*
664 * Move the initrd in case the bitmap of the bootmem allocater
665 * would overwrite it.
666 */
667
668 if (INITRD_START && INITRD_SIZE) {
669 unsigned long bmap_size;
670 unsigned long start;
671
672 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
673 bmap_size = PFN_PHYS(bmap_size);
674
675 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
676 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
677
678 if (start + INITRD_SIZE > memory_end) {
679 printk("initrd extends beyond end of memory "
680 "(0x%08lx > 0x%08lx)\n"
681 "disabling initrd\n",
682 start + INITRD_SIZE, memory_end);
683 INITRD_START = INITRD_SIZE = 0;
684 } else {
685 printk("Moving initrd (0x%08lx -> 0x%08lx, "
686 "size: %ld)\n",
687 INITRD_START, start, INITRD_SIZE);
688 memmove((void *) start, (void *) INITRD_START,
689 INITRD_SIZE);
690 INITRD_START = start;
691 }
692 }
693 }
694#endif
695
1da177e4 696 /*
7676bef9 697 * Initialize the boot-time allocator
1da177e4
LT		 698 */
699 bootmap_size = init_bootmem(start_pfn, end_pfn);
700
701 /*
702 * Register RAM areas with the bootmem allocator.
703 */
c9e37353 704
0b642ede 705 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
39b742f9 706 unsigned long start_chunk, end_chunk, pfn;
1da177e4
LT		 707
708 if (memory_chunk[i].type != CHUNK_READ_WRITE)
709 continue;
39b742f9
HC		 710 start_chunk = PFN_DOWN(memory_chunk[i].addr);
711 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
712 end_chunk = min(end_chunk, end_pfn);
713 if (start_chunk >= end_chunk)
714 continue;
715 add_active_range(0, start_chunk, end_chunk);
716 pfn = max(start_chunk, start_pfn);
717 for (; pfn <= end_chunk; pfn++)
718 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
1da177e4
LT		 719 }
720
0b642ede
PO		 721 psw_set_key(PAGE_DEFAULT_KEY);
722
39b742f9 723 free_bootmem_with_active_regions(0, max_pfn);
c9e37353 724
615b04b3
HC		 725 /*
726 * Reserve memory used for lowcore/command line/kernel image.
727 */
728 reserve_bootmem(0, (unsigned long)_ehead);
729 reserve_bootmem((unsigned long)_stext,
730 PFN_PHYS(start_pfn) - (unsigned long)_stext);
c9e37353
HC		 731 /*
732 * Reserve the bootmem bitmap itself as well. We do this in two
733 * steps (first step was init_bootmem()) because this catches
734 * the (very unlikely) case of us accidentally initializing the
735 * bootmem allocator with an invalid RAM area.
736 */
737 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
1da177e4
LT		 738
739#ifdef CONFIG_BLK_DEV_INITRD
65912a84 740 if (INITRD_START && INITRD_SIZE) {
1da177e4
LT		 741 if (INITRD_START + INITRD_SIZE <= memory_end) {
742 reserve_bootmem(INITRD_START, INITRD_SIZE);
743 initrd_start = INITRD_START;
744 initrd_end = initrd_start + INITRD_SIZE;
745 } else {
c9e37353
HC		 746 printk("initrd extends beyond end of memory "
747 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
748 initrd_start + INITRD_SIZE, memory_end);
749 initrd_start = initrd_end = 0;
1da177e4 750 }
c9e37353 751 }
1da177e4 752#endif
c9e37353 753}
1da177e4 754
cf8ba7a9
MS		 755static __init unsigned int stfl(void)
756{
757 asm volatile(
758 " .insn s,0xb2b10000,0(0)\n" /* stfl */
759 "0:\n"
760 EX_TABLE(0b,0b));
761 return S390_lowcore.stfl_fac_list;
762}
763
764static __init int stfle(unsigned long long *list, int doublewords)
765{
766 typedef struct { unsigned long long _[doublewords]; } addrtype;
767 register unsigned long __nr asm("0") = doublewords - 1;
768
769 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
770 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
771 return __nr + 1;
772}
773
774/*
775 * Setup hardware capabilities.
776 */
777static void __init setup_hwcaps(void)
778{
779 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
780 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
781 unsigned long long facility_list_extended;
782 unsigned int facility_list;
783 int i;
784
785 facility_list = stfl();
786 /*
787 * The store facility list bits numbers as found in the principles
788 * of operation are numbered with bit 1UL<<31 as number 0 to
789 * bit 1UL<<0 as number 31.
790 * Bit 0: instructions named N3, "backported" to esa-mode
791 * Bit 2: z/Architecture mode is active
792 * Bit 7: the store-facility-list-extended facility is installed
793 * Bit 17: the message-security assist is installed
794 * Bit 19: the long-displacement facility is installed
795 * Bit 21: the extended-immediate facility is installed
796 * These get translated to:
797 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
798 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
799 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
800 */
801 for (i = 0; i < 6; i++)
802 if (facility_list & (1UL << (31 - stfl_bits[i])))
803 elf_hwcap |= 1UL << i;
804
805 /*
806 * Check for additional facilities with store-facility-list-extended.
807 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
808 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
809 * as stored by stfl, bits 32-xxx contain additional facilities.
810 * How many facility words are stored depends on the number of
811 * doublewords passed to the instruction. The additional facilites
812 * are:
813 * Bit 43: decimal floating point facility is installed
814 * translated to:
815 * HWCAP_S390_DFP bit 6.
816 */
817 if ((elf_hwcap & (1UL << 2)) &&
818 stfle(&facility_list_extended, 1) > 0) {
819 if (facility_list_extended & (1ULL << (64 - 43)))
820 elf_hwcap |= 1UL << 6;
821 }
822
823 switch (cpuinfo->cpu_id.machine) {
824 case 0x9672:
825#if !defined(CONFIG_64BIT)
826 default: /* Use "g5" as default for 31 bit kernels. */
827#endif
828 strcpy(elf_platform, "g5");
829 break;
830 case 0x2064:
831 case 0x2066:
832#if defined(CONFIG_64BIT)
833 default: /* Use "z900" as default for 64 bit kernels. */
834#endif
835 strcpy(elf_platform, "z900");
836 break;
837 case 0x2084:
838 case 0x2086:
839 strcpy(elf_platform, "z990");
840 break;
841 case 0x2094:
842 strcpy(elf_platform, "z9-109");
843 break;
844 }
845}
846
c9e37353
HC		 847/*
848 * Setup function called from init/main.c just after the banner
849 * was printed.
850 */
1da177e4 851
c9e37353
HC		 852void __init
853setup_arch(char **cmdline_p)
854{
1da177e4 855 /*
c9e37353 856 * print what head.S has found out about the machine
1da177e4 857 */
347a8dc3 858#ifndef CONFIG_64BIT
c9e37353
HC		 859 printk((MACHINE_IS_VM) ?
860 "We are running under VM (31 bit mode)\n" :
861 "We are running native (31 bit mode)\n");
862 printk((MACHINE_HAS_IEEE) ?
863 "This machine has an IEEE fpu\n" :
864 "This machine has no IEEE fpu\n");
347a8dc3 865#else /* CONFIG_64BIT */
c9e37353
HC		 866 printk((MACHINE_IS_VM) ?
867 "We are running under VM (64 bit mode)\n" :
868 "We are running native (64 bit mode)\n");
347a8dc3 869#endif /* CONFIG_64BIT */
c9e37353 870
59685296 871 /* Save unparsed command line copy for /proc/cmdline */
e06b1a35 872 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
59685296
HC		 873
874 *cmdline_p = COMMAND_LINE;
875 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
876
c9e37353 877 ROOT_DEV = Root_RAM0;
59685296
HC		 878
879 init_mm.start_code = PAGE_OFFSET;
880 init_mm.end_code = (unsigned long) &_etext;
881 init_mm.end_data = (unsigned long) &_edata;
882 init_mm.brk = (unsigned long) &_end;
883
6c2a9e6d
GS		 884 if (MACHINE_HAS_MVCOS)
885 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
886 else
887 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
888
59685296
HC		 889 parse_early_param();
890
411ed322 891 setup_ipl_info();
8b62bc96 892 setup_memory_end();
c1821c2e 893 setup_addressing_mode();
c9e37353
HC		 894 setup_memory();
895 setup_resources();
896 setup_lowcore();
897
1da177e4
LT		 898 cpu_init();
899 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
255acee7 900 smp_setup_cpu_possible_map();
1da177e4 901
cf8ba7a9
MS		 902 /*
903 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
904 */
905 setup_hwcaps();
906
1da177e4
LT		 907 /*
908 * Create kernel page tables and switch to virtual addressing.
909 */
910 paging_init();
911
912 /* Setup default console */
913 conmode_default();
411ed322
MH		 914
915 /* Setup zfcpdump support */
916 setup_zfcpdump(console_devno);
1da177e4
LT		 917}
918
ea1f4eec 919void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
1da177e4
LT		 920{
921 printk("cpu %d "
922#ifdef CONFIG_SMP
923 "phys_idx=%d "
924#endif
925 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
926 cpuinfo->cpu_nr,
927#ifdef CONFIG_SMP
928 cpuinfo->cpu_addr,
929#endif
930 cpuinfo->cpu_id.version,
931 cpuinfo->cpu_id.ident,
932 cpuinfo->cpu_id.machine,
933 cpuinfo->cpu_id.unused);
934}
935
936/*
937 * show_cpuinfo - Get information on one CPU for use by procfs.
938 */
939
940static int show_cpuinfo(struct seq_file *m, void *v)
941{
cf8ba7a9
MS		 942 static const char *hwcap_str[7] = {
943 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
944 };
1da177e4
LT		 945 struct cpuinfo_S390 *cpuinfo;
946 unsigned long n = (unsigned long) v - 1;
cf8ba7a9 947 int i;
1da177e4 948
31ee4b2f 949 s390_adjust_jiffies();
b7ae9dd8 950 preempt_disable();
1da177e4
LT		 951 if (!n) {
952 seq_printf(m, "vendor_id : IBM/S390\n"
953 "# processors : %i\n"
954 "bogomips per cpu: %lu.%02lu\n",
955 num_online_cpus(), loops_per_jiffy/(500000/HZ),
956 (loops_per_jiffy/(5000/HZ))%100);
cf8ba7a9
MS		 957 seq_puts(m, "features\t: ");
958 for (i = 0; i < 7; i++)
959 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
960 seq_printf(m, "%s ", hwcap_str[i]);
961 seq_puts(m, "\n");
1da177e4 962 }
cf8ba7a9 963
1da177e4
LT		 964 if (cpu_online(n)) {
965#ifdef CONFIG_SMP
966 if (smp_processor_id() == n)
967 cpuinfo = &S390_lowcore.cpu_data;
968 else
969 cpuinfo = &lowcore_ptr[n]->cpu_data;
970#else
971 cpuinfo = &S390_lowcore.cpu_data;
972#endif
973 seq_printf(m, "processor %li: "
974 "version = %02X, "
975 "identification = %06X, "
976 "machine = %04X\n",
977 n, cpuinfo->cpu_id.version,
978 cpuinfo->cpu_id.ident,
979 cpuinfo->cpu_id.machine);
980 }
b7ae9dd8 981 preempt_enable();
1da177e4
LT		 982 return 0;
983}
984
985static void *c_start(struct seq_file *m, loff_t *pos)
986{
987 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
988}
989static void *c_next(struct seq_file *m, void *v, loff_t *pos)
990{
991 ++*pos;
992 return c_start(m, pos);
993}
994static void c_stop(struct seq_file *m, void *v)
995{
996}
997struct seq_operations cpuinfo_op = {
998 .start = c_start,
999 .next = c_next,
1000 .stop = c_stop,
1001 .show = show_cpuinfo,
1002};
1003
Linux 6.x block layer and io_uring tree(s)