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sched: fix update_load_add()/sub()
[wrt350n-kernel.git] / arch / s390 / kernel / setup.c
blob290e504061a350502d5e7662d357e02365d19740
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/tty.h>
28 #include <linux/ioport.h>
29 #include <linux/delay.h>
30 #include <linux/init.h>
31 #include <linux/initrd.h>
32 #include <linux/bootmem.h>
33 #include <linux/root_dev.h>
34 #include <linux/console.h>
35 #include <linux/seq_file.h>
36 #include <linux/kernel_stat.h>
37 #include <linux/device.h>
38 #include <linux/notifier.h>
39 #include <linux/pfn.h>
40 #include <linux/ctype.h>
41 #include <linux/reboot.h>
42
43 #include <asm/ipl.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.h>
46 #include <asm/smp.h>
47 #include <asm/mmu_context.h>
48 #include <asm/cpcmd.h>
49 #include <asm/lowcore.h>
50 #include <asm/irq.h>
51 #include <asm/page.h>
52 #include <asm/ptrace.h>
53 #include <asm/sections.h>
54 #include <asm/ebcdic.h>
55 #include <asm/compat.h>
56
57 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
58 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
59 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
60 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
61 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
62
63 /*
64 * User copy operations.
65 */
66 struct uaccess_ops uaccess;
67 EXPORT_SYMBOL(uaccess);
68
69 /*
70 * Machine setup..
71 */
72 unsigned int console_mode = 0;
73 unsigned int console_devno = -1;
74 unsigned int console_irq = -1;
75 unsigned long machine_flags = 0;
76 unsigned long elf_hwcap = 0;
77 char elf_platform[ELF_PLATFORM_SIZE];
78
79 struct mem_chunk __meminitdata memory_chunk[MEMORY_CHUNKS];
80 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
81 static unsigned long __initdata memory_end;
82
83 /*
84 * This is set up by the setup-routine at boot-time
85 * for S390 need to find out, what we have to setup
86 * using address 0x10400 ...
87 */
88
89 #include <asm/setup.h>
90
91 static struct resource code_resource = {
92 .name = "Kernel code",
93 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
94 };
95
96 static struct resource data_resource = {
97 .name = "Kernel data",
98 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
99 };
100
101 /*
102 * cpu_init() initializes state that is per-CPU.
103 */
104 void __cpuinit cpu_init(void)
105 {
106 int addr = hard_smp_processor_id();
107
108 /*
109 * Store processor id in lowcore (used e.g. in timer_interrupt)
110 */
111 get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
112 S390_lowcore.cpu_data.cpu_addr = addr;
113
114 /*
115 * Force FPU initialization:
116 */
117 clear_thread_flag(TIF_USEDFPU);
118 clear_used_math();
119
120 atomic_inc(&init_mm.mm_count);
121 current->active_mm = &init_mm;
122 if (current->mm)
123 BUG();
124 enter_lazy_tlb(&init_mm, current);
125 }
126
127 /*
128 * condev= and conmode= setup parameter.
129 */
130
131 static int __init condev_setup(char *str)
132 {
133 int vdev;
134
135 vdev = simple_strtoul(str, &str, 0);
136 if (vdev >= 0 && vdev < 65536) {
137 console_devno = vdev;
138 console_irq = -1;
139 }
140 return 1;
141 }
142
143 __setup("condev=", condev_setup);
144
145 static int __init conmode_setup(char *str)
146 {
147 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
148 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
149 SET_CONSOLE_SCLP;
150 #endif
151 #if defined(CONFIG_TN3215_CONSOLE)
152 if (strncmp(str, "3215", 5) == 0)
153 SET_CONSOLE_3215;
154 #endif
155 #if defined(CONFIG_TN3270_CONSOLE)
156 if (strncmp(str, "3270", 5) == 0)
157 SET_CONSOLE_3270;
158 #endif
159 return 1;
160 }
161
162 __setup("conmode=", conmode_setup);
163
164 static void __init conmode_default(void)
165 {
166 char query_buffer[1024];
167 char *ptr;
168
169 if (MACHINE_IS_VM) {
170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172 ptr = strstr(query_buffer, "SUBCHANNEL =");
173 console_irq = simple_strtoul(ptr + 13, NULL, 16);
174 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175 ptr = strstr(query_buffer, "CONMODE");
176 /*
177 * Set the conmode to 3215 so that the device recognition
178 * will set the cu_type of the console to 3215. If the
179 * conmode is 3270 and we don't set it back then both
180 * 3215 and the 3270 driver will try to access the console
181 * device (3215 as console and 3270 as normal tty).
182 */
183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184 if (ptr == NULL) {
185 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186 SET_CONSOLE_SCLP;
187 #endif
188 return;
189 }
190 if (strncmp(ptr + 8, "3270", 4) == 0) {
191 #if defined(CONFIG_TN3270_CONSOLE)
192 SET_CONSOLE_3270;
193 #elif defined(CONFIG_TN3215_CONSOLE)
194 SET_CONSOLE_3215;
195 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196 SET_CONSOLE_SCLP;
197 #endif
198 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199 #if defined(CONFIG_TN3215_CONSOLE)
200 SET_CONSOLE_3215;
201 #elif defined(CONFIG_TN3270_CONSOLE)
202 SET_CONSOLE_3270;
203 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 SET_CONSOLE_SCLP;
205 #endif
206 }
207 } else if (MACHINE_IS_P390) {
208 #if defined(CONFIG_TN3215_CONSOLE)
209 SET_CONSOLE_3215;
210 #elif defined(CONFIG_TN3270_CONSOLE)
211 SET_CONSOLE_3270;
212 #endif
213 } else {
214 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
215 SET_CONSOLE_SCLP;
216 #endif
217 }
218 }
219
220 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
221 static void __init setup_zfcpdump(unsigned int console_devno)
222 {
223 static char str[64];
224
225 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
226 return;
227 if (console_devno != -1)
228 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
229 ipl_info.data.fcp.dev_id.devno, console_devno);
230 else
231 sprintf(str, "cio_ignore=all,!0.0.%04x",
232 ipl_info.data.fcp.dev_id.devno);
233 strcat(COMMAND_LINE, " ");
234 strcat(COMMAND_LINE, str);
235 console_loglevel = 2;
236 }
237 #else
238 static inline void setup_zfcpdump(unsigned int console_devno) {}
239 #endif /* CONFIG_ZFCPDUMP */
240
241 /*
242 * Reboot, halt and power_off stubs. They just call _machine_restart,
243 * _machine_halt or _machine_power_off.
244 */
245
246 void machine_restart(char *command)
247 {
248 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
249 /*
250 * Only unblank the console if we are called in enabled
251 * context or a bust_spinlocks cleared the way for us.
252 */
253 console_unblank();
254 _machine_restart(command);
255 }
256
257 void machine_halt(void)
258 {
259 if (!in_interrupt() || oops_in_progress)
260 /*
261 * Only unblank the console if we are called in enabled
262 * context or a bust_spinlocks cleared the way for us.
263 */
264 console_unblank();
265 _machine_halt();
266 }
267
268 void machine_power_off(void)
269 {
270 if (!in_interrupt() || oops_in_progress)
271 /*
272 * Only unblank the console if we are called in enabled
273 * context or a bust_spinlocks cleared the way for us.
274 */
275 console_unblank();
276 _machine_power_off();
277 }
278
279 /*
280 * Dummy power off function.
281 */
282 void (*pm_power_off)(void) = machine_power_off;
283
284 static int __init early_parse_mem(char *p)
285 {
286 memory_end = memparse(p, &p);
287 return 0;
288 }
289 early_param("mem", early_parse_mem);
290
291 /*
292 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
293 */
294 static int __init early_parse_ipldelay(char *p)
295 {
296 unsigned long delay = 0;
297
298 delay = simple_strtoul(p, &p, 0);
299
300 switch (*p) {
301 case 's':
302 case 'S':
303 delay *= 1000000;
304 break;
305 case 'm':
306 case 'M':
307 delay *= 60 * 1000000;
308 }
309
310 /* now wait for the requested amount of time */
311 udelay(delay);
312
313 return 0;
314 }
315 early_param("ipldelay", early_parse_ipldelay);
316
317 #ifdef CONFIG_S390_SWITCH_AMODE
318 unsigned int switch_amode = 0;
319 EXPORT_SYMBOL_GPL(switch_amode);
320
321 static void set_amode_and_uaccess(unsigned long user_amode,
322 unsigned long user32_amode)
323 {
324 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
325 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
326 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
327 #ifdef CONFIG_COMPAT
328 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
329 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
330 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
331 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
332 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
333 PSW32_MASK_PSTATE;
334 #endif
335 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
336 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
337
338 if (MACHINE_HAS_MVCOS) {
339 printk("mvcos available.\n");
340 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
341 } else {
342 printk("mvcos not available.\n");
343 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
344 }
345 }
346
347 /*
348 * Switch kernel/user addressing modes?
349 */
350 static int __init early_parse_switch_amode(char *p)
351 {
352 switch_amode = 1;
353 return 0;
354 }
355 early_param("switch_amode", early_parse_switch_amode);
356
357 #else /* CONFIG_S390_SWITCH_AMODE */
358 static inline void set_amode_and_uaccess(unsigned long user_amode,
359 unsigned long user32_amode)
360 {
361 }
362 #endif /* CONFIG_S390_SWITCH_AMODE */
363
364 #ifdef CONFIG_S390_EXEC_PROTECT
365 unsigned int s390_noexec = 0;
366 EXPORT_SYMBOL_GPL(s390_noexec);
367
368 /*
369 * Enable execute protection?
370 */
371 static int __init early_parse_noexec(char *p)
372 {
373 if (!strncmp(p, "off", 3))
374 return 0;
375 switch_amode = 1;
376 s390_noexec = 1;
377 return 0;
378 }
379 early_param("noexec", early_parse_noexec);
380 #endif /* CONFIG_S390_EXEC_PROTECT */
381
382 static void setup_addressing_mode(void)
383 {
384 if (s390_noexec) {
385 printk("S390 execute protection active, ");
386 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
387 } else if (switch_amode) {
388 printk("S390 address spaces switched, ");
389 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
390 }
391 #ifdef CONFIG_TRACE_IRQFLAGS
392 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
393 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
394 #endif
395 }
396
397 static void __init
398 setup_lowcore(void)
399 {
400 struct _lowcore *lc;
401 int lc_pages;
402
403 /*
404 * Setup lowcore for boot cpu
405 */
406 lc_pages = sizeof(void *) == 8 ? 2 : 1;
407 lc = (struct _lowcore *)
408 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
409 memset(lc, 0, lc_pages * PAGE_SIZE);
410 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
411 lc->restart_psw.addr =
412 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
413 if (switch_amode)
414 lc->restart_psw.mask |= PSW_ASC_HOME;
415 lc->external_new_psw.mask = psw_kernel_bits;
416 lc->external_new_psw.addr =
417 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
418 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
419 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
420 lc->program_new_psw.mask = psw_kernel_bits;
421 lc->program_new_psw.addr =
422 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
423 lc->mcck_new_psw.mask =
424 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
425 lc->mcck_new_psw.addr =
426 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
427 lc->io_new_psw.mask = psw_kernel_bits;
428 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
429 lc->ipl_device = S390_lowcore.ipl_device;
430 lc->jiffy_timer = -1LL;
431 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
432 lc->async_stack = (unsigned long)
433 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
434 lc->panic_stack = (unsigned long)
435 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
436 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
437 lc->thread_info = (unsigned long) &init_thread_union;
438 #ifndef CONFIG_64BIT
439 if (MACHINE_HAS_IEEE) {
440 lc->extended_save_area_addr = (__u32)
441 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
442 /* enable extended save area */
443 __ctl_set_bit(14, 29);
444 }
445 #endif
446 set_prefix((u32)(unsigned long) lc);
447 }
448
449 static void __init
450 setup_resources(void)
451 {
452 struct resource *res, *sub_res;
453 int i;
454
455 code_resource.start = (unsigned long) &_text;
456 code_resource.end = (unsigned long) &_etext - 1;
457 data_resource.start = (unsigned long) &_etext;
458 data_resource.end = (unsigned long) &_edata - 1;
459
460 for (i = 0; i < MEMORY_CHUNKS; i++) {
461 if (!memory_chunk[i].size)
462 continue;
463 res = alloc_bootmem_low(sizeof(struct resource));
464 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
465 switch (memory_chunk[i].type) {
466 case CHUNK_READ_WRITE:
467 res->name = "System RAM";
468 break;
469 case CHUNK_READ_ONLY:
470 res->name = "System ROM";
471 res->flags |= IORESOURCE_READONLY;
472 break;
473 default:
474 res->name = "reserved";
475 }
476 res->start = memory_chunk[i].addr;
477 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
478 request_resource(&iomem_resource, res);
479
480 if (code_resource.start >= res->start &&
481 code_resource.start <= res->end &&
482 code_resource.end > res->end) {
483 sub_res = alloc_bootmem_low(sizeof(struct resource));
484 memcpy(sub_res, &code_resource,
485 sizeof(struct resource));
486 sub_res->end = res->end;
487 code_resource.start = res->end + 1;
488 request_resource(res, sub_res);
489 }
490
491 if (code_resource.start >= res->start &&
492 code_resource.start <= res->end &&
493 code_resource.end <= res->end)
494 request_resource(res, &code_resource);
495
496 if (data_resource.start >= res->start &&
497 data_resource.start <= res->end &&
498 data_resource.end > res->end) {
499 sub_res = alloc_bootmem_low(sizeof(struct resource));
500 memcpy(sub_res, &data_resource,
501 sizeof(struct resource));
502 sub_res->end = res->end;
503 data_resource.start = res->end + 1;
504 request_resource(res, sub_res);
505 }
506
507 if (data_resource.start >= res->start &&
508 data_resource.start <= res->end &&
509 data_resource.end <= res->end)
510 request_resource(res, &data_resource);
511 }
512 }
513
514 unsigned long real_memory_size;
515 EXPORT_SYMBOL_GPL(real_memory_size);
516
517 static void __init setup_memory_end(void)
518 {
519 unsigned long memory_size;
520 unsigned long max_mem;
521 int i;
522
523 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
524 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
525 memory_end = ZFCPDUMP_HSA_SIZE;
526 #endif
527 memory_size = 0;
528 memory_end &= PAGE_MASK;
529
530 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
531 memory_end = min(max_mem, memory_end);
532
533 /*
534 * Make sure all chunks are MAX_ORDER aligned so we don't need the
535 * extra checks that HOLES_IN_ZONE would require.
536 */
537 for (i = 0; i < MEMORY_CHUNKS; i++) {
538 unsigned long start, end;
539 struct mem_chunk *chunk;
540 unsigned long align;
541
542 chunk = &memory_chunk[i];
543 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
544 start = (chunk->addr + align - 1) & ~(align - 1);
545 end = (chunk->addr + chunk->size) & ~(align - 1);
546 if (start >= end)
547 memset(chunk, 0, sizeof(*chunk));
548 else {
549 chunk->addr = start;
550 chunk->size = end - start;
551 }
552 }
553
554 for (i = 0; i < MEMORY_CHUNKS; i++) {
555 struct mem_chunk *chunk = &memory_chunk[i];
556
557 real_memory_size = max(real_memory_size,
558 chunk->addr + chunk->size);
559 if (chunk->addr >= max_mem) {
560 memset(chunk, 0, sizeof(*chunk));
561 continue;
562 }
563 if (chunk->addr + chunk->size > max_mem)
564 chunk->size = max_mem - chunk->addr;
565 memory_size = max(memory_size, chunk->addr + chunk->size);
566 }
567 if (!memory_end)
568 memory_end = memory_size;
569 }
570
571 static void __init
572 setup_memory(void)
573 {
574 unsigned long bootmap_size;
575 unsigned long start_pfn, end_pfn;
576 int i;
577
578 /*
579 * partially used pages are not usable - thus
580 * we are rounding upwards:
581 */
582 start_pfn = PFN_UP(__pa(&_end));
583 end_pfn = max_pfn = PFN_DOWN(memory_end);
584
585 #ifdef CONFIG_BLK_DEV_INITRD
586 /*
587 * Move the initrd in case the bitmap of the bootmem allocater
588 * would overwrite it.
589 */
590
591 if (INITRD_START && INITRD_SIZE) {
592 unsigned long bmap_size;
593 unsigned long start;
594
595 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
596 bmap_size = PFN_PHYS(bmap_size);
597
598 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
599 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
600
601 if (start + INITRD_SIZE > memory_end) {
602 printk("initrd extends beyond end of memory "
603 "(0x%08lx > 0x%08lx)\n"
604 "disabling initrd\n",
605 start + INITRD_SIZE, memory_end);
606 INITRD_START = INITRD_SIZE = 0;
607 } else {
608 printk("Moving initrd (0x%08lx -> 0x%08lx, "
609 "size: %ld)\n",
610 INITRD_START, start, INITRD_SIZE);
611 memmove((void *) start, (void *) INITRD_START,
612 INITRD_SIZE);
613 INITRD_START = start;
614 }
615 }
616 }
617 #endif
618
619 /*
620 * Initialize the boot-time allocator
621 */
622 bootmap_size = init_bootmem(start_pfn, end_pfn);
623
624 /*
625 * Register RAM areas with the bootmem allocator.
626 */
627
628 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
629 unsigned long start_chunk, end_chunk, pfn;
630
631 if (memory_chunk[i].type != CHUNK_READ_WRITE)
632 continue;
633 start_chunk = PFN_DOWN(memory_chunk[i].addr);
634 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
635 end_chunk = min(end_chunk, end_pfn);
636 if (start_chunk >= end_chunk)
637 continue;
638 add_active_range(0, start_chunk, end_chunk);
639 pfn = max(start_chunk, start_pfn);
640 for (; pfn <= end_chunk; pfn++)
641 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
642 }
643
644 psw_set_key(PAGE_DEFAULT_KEY);
645
646 free_bootmem_with_active_regions(0, max_pfn);
647
648 /*
649 * Reserve memory used for lowcore/command line/kernel image.
650 */
651 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
652 reserve_bootmem((unsigned long)_stext,
653 PFN_PHYS(start_pfn) - (unsigned long)_stext,
654 BOOTMEM_DEFAULT);
655 /*
656 * Reserve the bootmem bitmap itself as well. We do this in two
657 * steps (first step was init_bootmem()) because this catches
658 * the (very unlikely) case of us accidentally initializing the
659 * bootmem allocator with an invalid RAM area.
660 */
661 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
662 BOOTMEM_DEFAULT);
663
664 #ifdef CONFIG_BLK_DEV_INITRD
665 if (INITRD_START && INITRD_SIZE) {
666 if (INITRD_START + INITRD_SIZE <= memory_end) {
667 reserve_bootmem(INITRD_START, INITRD_SIZE,
668 BOOTMEM_DEFAULT);
669 initrd_start = INITRD_START;
670 initrd_end = initrd_start + INITRD_SIZE;
671 } else {
672 printk("initrd extends beyond end of memory "
673 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
674 initrd_start + INITRD_SIZE, memory_end);
675 initrd_start = initrd_end = 0;
676 }
677 }
678 #endif
679 }
680
681 static __init unsigned int stfl(void)
682 {
683 asm volatile(
684 " .insn s,0xb2b10000,0(0)\n" /* stfl */
685 "0:\n"
686 EX_TABLE(0b,0b));
687 return S390_lowcore.stfl_fac_list;
688 }
689
690 static __init int stfle(unsigned long long *list, int doublewords)
691 {
692 typedef struct { unsigned long long _[doublewords]; } addrtype;
693 register unsigned long __nr asm("0") = doublewords - 1;
694
695 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
696 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
697 return __nr + 1;
698 }
699
700 /*
701 * Setup hardware capabilities.
702 */
703 static void __init setup_hwcaps(void)
704 {
705 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
706 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
707 unsigned long long facility_list_extended;
708 unsigned int facility_list;
709 int i;
710
711 facility_list = stfl();
712 /*
713 * The store facility list bits numbers as found in the principles
714 * of operation are numbered with bit 1UL<<31 as number 0 to
715 * bit 1UL<<0 as number 31.
716 * Bit 0: instructions named N3, "backported" to esa-mode
717 * Bit 2: z/Architecture mode is active
718 * Bit 7: the store-facility-list-extended facility is installed
719 * Bit 17: the message-security assist is installed
720 * Bit 19: the long-displacement facility is installed
721 * Bit 21: the extended-immediate facility is installed
722 * These get translated to:
723 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
724 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
725 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
726 */
727 for (i = 0; i < 6; i++)
728 if (facility_list & (1UL << (31 - stfl_bits[i])))
729 elf_hwcap |= 1UL << i;
730
731 /*
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilites
738 * are:
739 * Bit 43: decimal floating point facility is installed
740 * translated to:
741 * HWCAP_S390_DFP bit 6.
742 */
743 if ((elf_hwcap & (1UL << 2)) &&
744 stfle(&facility_list_extended, 1) > 0) {
745 if (facility_list_extended & (1ULL << (64 - 43)))
746 elf_hwcap |= 1UL << 6;
747 }
748
749 switch (cpuinfo->cpu_id.machine) {
750 case 0x9672:
751 #if !defined(CONFIG_64BIT)
752 default: /* Use "g5" as default for 31 bit kernels. */
753 #endif
754 strcpy(elf_platform, "g5");
755 break;
756 case 0x2064:
757 case 0x2066:
758 #if defined(CONFIG_64BIT)
759 default: /* Use "z900" as default for 64 bit kernels. */
760 #endif
761 strcpy(elf_platform, "z900");
762 break;
763 case 0x2084:
764 case 0x2086:
765 strcpy(elf_platform, "z990");
766 break;
767 case 0x2094:
768 strcpy(elf_platform, "z9-109");
769 break;
770 }
771 }
772
773 /*
774 * Setup function called from init/main.c just after the banner
775 * was printed.
776 */
777
778 void __init
779 setup_arch(char **cmdline_p)
780 {
781 /*
782 * print what head.S has found out about the machine
783 */
784 #ifndef CONFIG_64BIT
785 printk((MACHINE_IS_VM) ?
786 "We are running under VM (31 bit mode)\n" :
787 "We are running native (31 bit mode)\n");
788 printk((MACHINE_HAS_IEEE) ?
789 "This machine has an IEEE fpu\n" :
790 "This machine has no IEEE fpu\n");
791 #else /* CONFIG_64BIT */
792 printk((MACHINE_IS_VM) ?
793 "We are running under VM (64 bit mode)\n" :
794 "We are running native (64 bit mode)\n");
795 #endif /* CONFIG_64BIT */
796
797 /* Save unparsed command line copy for /proc/cmdline */
798 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
799
800 *cmdline_p = COMMAND_LINE;
801 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
802
803 ROOT_DEV = Root_RAM0;
804
805 init_mm.start_code = PAGE_OFFSET;
806 init_mm.end_code = (unsigned long) &_etext;
807 init_mm.end_data = (unsigned long) &_edata;
808 init_mm.brk = (unsigned long) &_end;
809
810 if (MACHINE_HAS_MVCOS)
811 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
812 else
813 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
814
815 parse_early_param();
816
817 setup_ipl();
818 setup_memory_end();
819 setup_addressing_mode();
820 setup_memory();
821 setup_resources();
822 setup_lowcore();
823
824 cpu_init();
825 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
826
827 /*
828 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
829 */
830 setup_hwcaps();
831
832 /*
833 * Create kernel page tables and switch to virtual addressing.
834 */
835 paging_init();
836
837 /* Setup default console */
838 conmode_default();
839
840 /* Setup zfcpdump support */
841 setup_zfcpdump(console_devno);
842 }
843
844 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
845 {
846 printk(KERN_INFO "cpu %d "
847 #ifdef CONFIG_SMP
848 "phys_idx=%d "
849 #endif
850 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
851 cpuinfo->cpu_nr,
852 #ifdef CONFIG_SMP
853 cpuinfo->cpu_addr,
854 #endif
855 cpuinfo->cpu_id.version,
856 cpuinfo->cpu_id.ident,
857 cpuinfo->cpu_id.machine,
858 cpuinfo->cpu_id.unused);
859 }
860
861 /*
862 * show_cpuinfo - Get information on one CPU for use by procfs.
863 */
864
865 static int show_cpuinfo(struct seq_file *m, void *v)
866 {
867 static const char *hwcap_str[7] = {
868 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
869 };
870 struct cpuinfo_S390 *cpuinfo;
871 unsigned long n = (unsigned long) v - 1;
872 int i;
873
874 s390_adjust_jiffies();
875 preempt_disable();
876 if (!n) {
877 seq_printf(m, "vendor_id : IBM/S390\n"
878 "# processors : %i\n"
879 "bogomips per cpu: %lu.%02lu\n",
880 num_online_cpus(), loops_per_jiffy/(500000/HZ),
881 (loops_per_jiffy/(5000/HZ))%100);
882 seq_puts(m, "features\t: ");
883 for (i = 0; i < 7; i++)
884 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
885 seq_printf(m, "%s ", hwcap_str[i]);
886 seq_puts(m, "\n");
887 }
888
889 if (cpu_online(n)) {
890 #ifdef CONFIG_SMP
891 if (smp_processor_id() == n)
892 cpuinfo = &S390_lowcore.cpu_data;
893 else
894 cpuinfo = &lowcore_ptr[n]->cpu_data;
895 #else
896 cpuinfo = &S390_lowcore.cpu_data;
897 #endif
898 seq_printf(m, "processor %li: "
899 "version = %02X, "
900 "identification = %06X, "
901 "machine = %04X\n",
902 n, cpuinfo->cpu_id.version,
903 cpuinfo->cpu_id.ident,
904 cpuinfo->cpu_id.machine);
905 }
906 preempt_enable();
907 return 0;
908 }
909
910 static void *c_start(struct seq_file *m, loff_t *pos)
911 {
912 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
913 }
914 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
915 {
916 ++*pos;
917 return c_start(m, pos);
918 }
919 static void c_stop(struct seq_file *m, void *v)
920 {
921 }
922 const struct seq_operations cpuinfo_op = {
923 .start = c_start,
924 .next = c_next,
925 .stop = c_stop,
926 .show = show_cpuinfo,
927 };
928
WRT350N Kernel Patches