1 /*
2 * arch/s390/kernel/setup.c
3 *
4 * S390 version
5 * Copyright (C) IBM Corp. 1999,2010
6 * Author(s): Hartmut Penner (hp@de.ibm.com),
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
11 */
12
13 /*
14 * This file handles the architecture-dependent parts of initialization
15 */
16
17 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.h>
24 #include <linux/mm.h>
25 #include <linux/stddef.h>
26 #include <linux/unistd.h>
27 #include <linux/ptrace.h>
28 #include <linux/user.h>
29 #include <linux/tty.h>
30 #include <linux/ioport.h>
31 #include <linux/delay.h>
32 #include <linux/init.h>
33 #include <linux/initrd.h>
34 #include <linux/bootmem.h>
35 #include <linux/root_dev.h>
36 #include <linux/console.h>
37 #include <linux/kernel_stat.h>
38 #include <linux/device.h>
39 #include <linux/notifier.h>
40 #include <linux/pfn.h>
41 #include <linux/ctype.h>
42 #include <linux/reboot.h>
43 #include <linux/topology.h>
44 #include <linux/ftrace.h>
45
46 #include <asm/ipl.h>
47 #include <asm/uaccess.h>
48 #include <asm/system.h>
49 #include <asm/smp.h>
50 #include <asm/mmu_context.h>
51 #include <asm/cpcmd.h>
52 #include <asm/lowcore.h>
53 #include <asm/irq.h>
54 #include <asm/page.h>
55 #include <asm/ptrace.h>
56 #include <asm/sections.h>
57 #include <asm/ebcdic.h>
58 #include <asm/compat.h>
59 #include <asm/kvm_virtio.h>
60
61 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
62 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
63 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66
67 /*
68 * User copy operations.
69 */
70 struct uaccess_ops uaccess;
71 EXPORT_SYMBOL(uaccess);
72
73 /*
74 * Machine setup..
75 */
76 unsigned int console_mode = 0;
77 EXPORT_SYMBOL(console_mode);
78
79 unsigned int console_devno = -1;
80 EXPORT_SYMBOL(console_devno);
81
82 unsigned int console_irq = -1;
83 EXPORT_SYMBOL(console_irq);
84
85 unsigned long elf_hwcap = 0;
86 char elf_platform[ELF_PLATFORM_SIZE];
87
88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
89
90 int __initdata memory_end_set;
91 unsigned long __initdata memory_end;
92
93 /* An array with a pointer to the lowcore of every CPU. */
94 struct _lowcore *lowcore_ptr[NR_CPUS];
95 EXPORT_SYMBOL(lowcore_ptr);
96
97 /*
98 * This is set up by the setup-routine at boot-time
99 * for S390 need to find out, what we have to setup
100 * using address 0x10400 ...
101 */
102
103 #include <asm/setup.h>
104
105 /*
106 * condev= and conmode= setup parameter.
107 */
108
condev_setup(char * str)109 static int __init condev_setup(char *str)
110 {
111 int vdev;
112
113 vdev = simple_strtoul(str, &str, 0);
114 if (vdev >= 0 && vdev < 65536) {
115 console_devno = vdev;
116 console_irq = -1;
117 }
118 return 1;
119 }
120
121 __setup("condev=", condev_setup);
122
set_preferred_console(void)123 static void __init set_preferred_console(void)
124 {
125 if (MACHINE_IS_KVM)
126 add_preferred_console("hvc", 0, NULL);
127 else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
128 add_preferred_console("ttyS", 0, NULL);
129 else if (CONSOLE_IS_3270)
130 add_preferred_console("tty3270", 0, NULL);
131 }
132
conmode_setup(char * str)133 static int __init conmode_setup(char *str)
134 {
135 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
136 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
137 SET_CONSOLE_SCLP;
138 #endif
139 #if defined(CONFIG_TN3215_CONSOLE)
140 if (strncmp(str, "3215", 5) == 0)
141 SET_CONSOLE_3215;
142 #endif
143 #if defined(CONFIG_TN3270_CONSOLE)
144 if (strncmp(str, "3270", 5) == 0)
145 SET_CONSOLE_3270;
146 #endif
147 set_preferred_console();
148 return 1;
149 }
150
151 __setup("conmode=", conmode_setup);
152
conmode_default(void)153 static void __init conmode_default(void)
154 {
155 char query_buffer[1024];
156 char *ptr;
157
158 if (MACHINE_IS_VM) {
159 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
160 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
161 ptr = strstr(query_buffer, "SUBCHANNEL =");
162 console_irq = simple_strtoul(ptr + 13, NULL, 16);
163 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
164 ptr = strstr(query_buffer, "CONMODE");
165 /*
166 * Set the conmode to 3215 so that the device recognition
167 * will set the cu_type of the console to 3215. If the
168 * conmode is 3270 and we don't set it back then both
169 * 3215 and the 3270 driver will try to access the console
170 * device (3215 as console and 3270 as normal tty).
171 */
172 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
173 if (ptr == NULL) {
174 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
175 SET_CONSOLE_SCLP;
176 #endif
177 return;
178 }
179 if (strncmp(ptr + 8, "3270", 4) == 0) {
180 #if defined(CONFIG_TN3270_CONSOLE)
181 SET_CONSOLE_3270;
182 #elif defined(CONFIG_TN3215_CONSOLE)
183 SET_CONSOLE_3215;
184 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185 SET_CONSOLE_SCLP;
186 #endif
187 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
188 #if defined(CONFIG_TN3215_CONSOLE)
189 SET_CONSOLE_3215;
190 #elif defined(CONFIG_TN3270_CONSOLE)
191 SET_CONSOLE_3270;
192 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
193 SET_CONSOLE_SCLP;
194 #endif
195 }
196 } else {
197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
198 SET_CONSOLE_SCLP;
199 #endif
200 }
201 }
202
203 #ifdef CONFIG_ZFCPDUMP
setup_zfcpdump(unsigned int console_devno)204 static void __init setup_zfcpdump(unsigned int console_devno)
205 {
206 static char str[41];
207
208 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
209 return;
210 if (console_devno != -1)
211 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
212 ipl_info.data.fcp.dev_id.devno, console_devno);
213 else
214 sprintf(str, " cio_ignore=all,!0.0.%04x",
215 ipl_info.data.fcp.dev_id.devno);
216 strcat(boot_command_line, str);
217 console_loglevel = 2;
218 }
219 #else
setup_zfcpdump(unsigned int console_devno)220 static inline void setup_zfcpdump(unsigned int console_devno) {}
221 #endif /* CONFIG_ZFCPDUMP */
222
223 /*
224 * Reboot, halt and power_off stubs. They just call _machine_restart,
225 * _machine_halt or _machine_power_off.
226 */
227
machine_restart(char * command)228 void machine_restart(char *command)
229 {
230 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
231 /*
232 * Only unblank the console if we are called in enabled
233 * context or a bust_spinlocks cleared the way for us.
234 */
235 console_unblank();
236 _machine_restart(command);
237 }
238
machine_halt(void)239 void machine_halt(void)
240 {
241 if (!in_interrupt() || oops_in_progress)
242 /*
243 * Only unblank the console if we are called in enabled
244 * context or a bust_spinlocks cleared the way for us.
245 */
246 console_unblank();
247 _machine_halt();
248 }
249
machine_power_off(void)250 void machine_power_off(void)
251 {
252 if (!in_interrupt() || oops_in_progress)
253 /*
254 * Only unblank the console if we are called in enabled
255 * context or a bust_spinlocks cleared the way for us.
256 */
257 console_unblank();
258 _machine_power_off();
259 }
260
261 /*
262 * Dummy power off function.
263 */
264 void (*pm_power_off)(void) = machine_power_off;
265
early_parse_mem(char * p)266 static int __init early_parse_mem(char *p)
267 {
268 memory_end = memparse(p, &p);
269 memory_end_set = 1;
270 return 0;
271 }
272 early_param("mem", early_parse_mem);
273
274 unsigned int user_mode = HOME_SPACE_MODE;
275 EXPORT_SYMBOL_GPL(user_mode);
276
set_amode_and_uaccess(unsigned long user_amode,unsigned long user32_amode)277 static int set_amode_and_uaccess(unsigned long user_amode,
278 unsigned long user32_amode)
279 {
280 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
281 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
282 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
283 #ifdef CONFIG_COMPAT
284 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
285 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
286 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
287 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
288 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
289 PSW32_MASK_PSTATE;
290 #endif
291 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
292 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
293
294 if (MACHINE_HAS_MVCOS) {
295 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
296 return 1;
297 } else {
298 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
299 return 0;
300 }
301 }
302
303 /*
304 * Switch kernel/user addressing modes?
305 */
early_parse_switch_amode(char * p)306 static int __init early_parse_switch_amode(char *p)
307 {
308 if (user_mode != SECONDARY_SPACE_MODE)
309 user_mode = PRIMARY_SPACE_MODE;
310 return 0;
311 }
312 early_param("switch_amode", early_parse_switch_amode);
313
early_parse_user_mode(char * p)314 static int __init early_parse_user_mode(char *p)
315 {
316 if (p && strcmp(p, "primary") == 0)
317 user_mode = PRIMARY_SPACE_MODE;
318 #ifdef CONFIG_S390_EXEC_PROTECT
319 else if (p && strcmp(p, "secondary") == 0)
320 user_mode = SECONDARY_SPACE_MODE;
321 #endif
322 else if (!p || strcmp(p, "home") == 0)
323 user_mode = HOME_SPACE_MODE;
324 else
325 return 1;
326 return 0;
327 }
328 early_param("user_mode", early_parse_user_mode);
329
330 #ifdef CONFIG_S390_EXEC_PROTECT
331 /*
332 * Enable execute protection?
333 */
early_parse_noexec(char * p)334 static int __init early_parse_noexec(char *p)
335 {
336 if (!strncmp(p, "off", 3))
337 return 0;
338 user_mode = SECONDARY_SPACE_MODE;
339 return 0;
340 }
341 early_param("noexec", early_parse_noexec);
342 #endif /* CONFIG_S390_EXEC_PROTECT */
343
setup_addressing_mode(void)344 static void setup_addressing_mode(void)
345 {
346 if (user_mode == SECONDARY_SPACE_MODE) {
347 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
348 PSW32_ASC_SECONDARY))
349 pr_info("Execute protection active, "
350 "mvcos available\n");
351 else
352 pr_info("Execute protection active, "
353 "mvcos not available\n");
354 } else if (user_mode == PRIMARY_SPACE_MODE) {
355 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
356 pr_info("Address spaces switched, "
357 "mvcos available\n");
358 else
359 pr_info("Address spaces switched, "
360 "mvcos not available\n");
361 }
362 }
363
364 static void __init
setup_lowcore(void)365 setup_lowcore(void)
366 {
367 struct _lowcore *lc;
368
369 /*
370 * Setup lowcore for boot cpu
371 */
372 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
373 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
374 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
375 lc->restart_psw.addr =
376 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
377 if (user_mode != HOME_SPACE_MODE)
378 lc->restart_psw.mask |= PSW_ASC_HOME;
379 lc->external_new_psw.mask = psw_kernel_bits;
380 lc->external_new_psw.addr =
381 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
382 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
383 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
384 lc->program_new_psw.mask = psw_kernel_bits;
385 lc->program_new_psw.addr =
386 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
387 lc->mcck_new_psw.mask =
388 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
389 lc->mcck_new_psw.addr =
390 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
391 lc->io_new_psw.mask = psw_kernel_bits;
392 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
393 lc->clock_comparator = -1ULL;
394 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
395 lc->async_stack = (unsigned long)
396 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
397 lc->panic_stack = (unsigned long)
398 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
399 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
400 lc->thread_info = (unsigned long) &init_thread_union;
401 lc->machine_flags = S390_lowcore.machine_flags;
402 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
403 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
404 MAX_FACILITY_BIT/8);
405 #ifndef CONFIG_64BIT
406 if (MACHINE_HAS_IEEE) {
407 lc->extended_save_area_addr = (__u32)
408 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
409 /* enable extended save area */
410 __ctl_set_bit(14, 29);
411 }
412 #else
413 lc->cmf_hpp = -1ULL;
414 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
415 #endif
416 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
417 lc->async_enter_timer = S390_lowcore.async_enter_timer;
418 lc->exit_timer = S390_lowcore.exit_timer;
419 lc->user_timer = S390_lowcore.user_timer;
420 lc->system_timer = S390_lowcore.system_timer;
421 lc->steal_timer = S390_lowcore.steal_timer;
422 lc->last_update_timer = S390_lowcore.last_update_timer;
423 lc->last_update_clock = S390_lowcore.last_update_clock;
424 lc->ftrace_func = S390_lowcore.ftrace_func;
425 set_prefix((u32)(unsigned long) lc);
426 lowcore_ptr[0] = lc;
427 }
428
429 static struct resource code_resource = {
430 .name = "Kernel code",
431 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
432 };
433
434 static struct resource data_resource = {
435 .name = "Kernel data",
436 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
437 };
438
439 static struct resource bss_resource = {
440 .name = "Kernel bss",
441 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
442 };
443
444 static struct resource __initdata *standard_resources[] = {
445 &code_resource,
446 &data_resource,
447 &bss_resource,
448 };
449
setup_resources(void)450 static void __init setup_resources(void)
451 {
452 struct resource *res, *std_res, *sub_res;
453 int i, j;
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 bss_resource.start = (unsigned long) &__bss_start;
460 bss_resource.end = (unsigned long) &__bss_stop - 1;
461
462 for (i = 0; i < MEMORY_CHUNKS; i++) {
463 if (!memory_chunk[i].size)
464 continue;
465 res = alloc_bootmem_low(sizeof(*res));
466 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
467 switch (memory_chunk[i].type) {
468 case CHUNK_READ_WRITE:
469 res->name = "System RAM";
470 break;
471 case CHUNK_READ_ONLY:
472 res->name = "System ROM";
473 res->flags |= IORESOURCE_READONLY;
474 break;
475 default:
476 res->name = "reserved";
477 }
478 res->start = memory_chunk[i].addr;
479 res->end = res->start + memory_chunk[i].size - 1;
480 request_resource(&iomem_resource, res);
481
482 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
483 std_res = standard_resources[j];
484 if (std_res->start < res->start ||
485 std_res->start > res->end)
486 continue;
487 if (std_res->end > res->end) {
488 sub_res = alloc_bootmem_low(sizeof(*sub_res));
489 *sub_res = *std_res;
490 sub_res->end = res->end;
491 std_res->start = res->end + 1;
492 request_resource(res, sub_res);
493 } else {
494 request_resource(res, std_res);
495 }
496 }
497 }
498 }
499
500 unsigned long real_memory_size;
501 EXPORT_SYMBOL_GPL(real_memory_size);
502
setup_memory_end(void)503 static void __init setup_memory_end(void)
504 {
505 unsigned long memory_size;
506 unsigned long max_mem;
507 int i;
508
509 #ifdef CONFIG_ZFCPDUMP
510 if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
511 memory_end = ZFCPDUMP_HSA_SIZE;
512 memory_end_set = 1;
513 }
514 #endif
515 memory_size = 0;
516 memory_end &= PAGE_MASK;
517
518 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
519 memory_end = min(max_mem, memory_end);
520
521 /*
522 * Make sure all chunks are MAX_ORDER aligned so we don't need the
523 * extra checks that HOLES_IN_ZONE would require.
524 */
525 for (i = 0; i < MEMORY_CHUNKS; i++) {
526 unsigned long start, end;
527 struct mem_chunk *chunk;
528 unsigned long align;
529
530 chunk = &memory_chunk[i];
531 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
532 start = (chunk->addr + align - 1) & ~(align - 1);
533 end = (chunk->addr + chunk->size) & ~(align - 1);
534 if (start >= end)
535 memset(chunk, 0, sizeof(*chunk));
536 else {
537 chunk->addr = start;
538 chunk->size = end - start;
539 }
540 }
541
542 for (i = 0; i < MEMORY_CHUNKS; i++) {
543 struct mem_chunk *chunk = &memory_chunk[i];
544
545 real_memory_size = max(real_memory_size,
546 chunk->addr + chunk->size);
547 if (chunk->addr >= max_mem) {
548 memset(chunk, 0, sizeof(*chunk));
549 continue;
550 }
551 if (chunk->addr + chunk->size > max_mem)
552 chunk->size = max_mem - chunk->addr;
553 memory_size = max(memory_size, chunk->addr + chunk->size);
554 }
555 if (!memory_end)
556 memory_end = memory_size;
557 }
558
559 static void __init
setup_memory(void)560 setup_memory(void)
561 {
562 unsigned long bootmap_size;
563 unsigned long start_pfn, end_pfn;
564 int i;
565
566 /*
567 * partially used pages are not usable - thus
568 * we are rounding upwards:
569 */
570 start_pfn = PFN_UP(__pa(&_end));
571 end_pfn = max_pfn = PFN_DOWN(memory_end);
572
573 #ifdef CONFIG_BLK_DEV_INITRD
574 /*
575 * Move the initrd in case the bitmap of the bootmem allocater
576 * would overwrite it.
577 */
578
579 if (INITRD_START && INITRD_SIZE) {
580 unsigned long bmap_size;
581 unsigned long start;
582
583 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
584 bmap_size = PFN_PHYS(bmap_size);
585
586 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
587 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
588
589 if (start + INITRD_SIZE > memory_end) {
590 pr_err("initrd extends beyond end of "
591 "memory (0x%08lx > 0x%08lx) "
592 "disabling initrd\n",
593 start + INITRD_SIZE, memory_end);
594 INITRD_START = INITRD_SIZE = 0;
595 } else {
596 pr_info("Moving initrd (0x%08lx -> "
597 "0x%08lx, size: %ld)\n",
598 INITRD_START, start, INITRD_SIZE);
599 memmove((void *) start, (void *) INITRD_START,
600 INITRD_SIZE);
601 INITRD_START = start;
602 }
603 }
604 }
605 #endif
606
607 /*
608 * Initialize the boot-time allocator
609 */
610 bootmap_size = init_bootmem(start_pfn, end_pfn);
611
612 /*
613 * Register RAM areas with the bootmem allocator.
614 */
615
616 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
617 unsigned long start_chunk, end_chunk, pfn;
618
619 if (memory_chunk[i].type != CHUNK_READ_WRITE)
620 continue;
621 start_chunk = PFN_DOWN(memory_chunk[i].addr);
622 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
623 end_chunk = min(end_chunk, end_pfn);
624 if (start_chunk >= end_chunk)
625 continue;
626 add_active_range(0, start_chunk, end_chunk);
627 pfn = max(start_chunk, start_pfn);
628 for (; pfn < end_chunk; pfn++)
629 page_set_storage_key(PFN_PHYS(pfn),
630 PAGE_DEFAULT_KEY, 0);
631 }
632
633 psw_set_key(PAGE_DEFAULT_KEY);
634
635 free_bootmem_with_active_regions(0, max_pfn);
636
637 /*
638 * Reserve memory used for lowcore/command line/kernel image.
639 */
640 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
641 reserve_bootmem((unsigned long)_stext,
642 PFN_PHYS(start_pfn) - (unsigned long)_stext,
643 BOOTMEM_DEFAULT);
644 /*
645 * Reserve the bootmem bitmap itself as well. We do this in two
646 * steps (first step was init_bootmem()) because this catches
647 * the (very unlikely) case of us accidentally initializing the
648 * bootmem allocator with an invalid RAM area.
649 */
650 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
651 BOOTMEM_DEFAULT);
652
653 #ifdef CONFIG_BLK_DEV_INITRD
654 if (INITRD_START && INITRD_SIZE) {
655 if (INITRD_START + INITRD_SIZE <= memory_end) {
656 reserve_bootmem(INITRD_START, INITRD_SIZE,
657 BOOTMEM_DEFAULT);
658 initrd_start = INITRD_START;
659 initrd_end = initrd_start + INITRD_SIZE;
660 } else {
661 pr_err("initrd extends beyond end of "
662 "memory (0x%08lx > 0x%08lx) "
663 "disabling initrd\n",
664 initrd_start + INITRD_SIZE, memory_end);
665 initrd_start = initrd_end = 0;
666 }
667 }
668 #endif
669 }
670
671 /*
672 * Setup hardware capabilities.
673 */
setup_hwcaps(void)674 static void __init setup_hwcaps(void)
675 {
676 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
677 struct cpuid cpu_id;
678 int i;
679
680 /*
681 * The store facility list bits numbers as found in the principles
682 * of operation are numbered with bit 1UL<<31 as number 0 to
683 * bit 1UL<<0 as number 31.
684 * Bit 0: instructions named N3, "backported" to esa-mode
685 * Bit 2: z/Architecture mode is active
686 * Bit 7: the store-facility-list-extended facility is installed
687 * Bit 17: the message-security assist is installed
688 * Bit 19: the long-displacement facility is installed
689 * Bit 21: the extended-immediate facility is installed
690 * Bit 22: extended-translation facility 3 is installed
691 * Bit 30: extended-translation facility 3 enhancement facility
692 * These get translated to:
693 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
694 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
695 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
696 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
697 */
698 for (i = 0; i < 6; i++)
699 if (test_facility(stfl_bits[i]))
700 elf_hwcap |= 1UL << i;
701
702 if (test_facility(22) && test_facility(30))
703 elf_hwcap |= HWCAP_S390_ETF3EH;
704
705 /*
706 * Check for additional facilities with store-facility-list-extended.
707 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
708 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
709 * as stored by stfl, bits 32-xxx contain additional facilities.
710 * How many facility words are stored depends on the number of
711 * doublewords passed to the instruction. The additional facilities
712 * are:
713 * Bit 42: decimal floating point facility is installed
714 * Bit 44: perform floating point operation facility is installed
715 * translated to:
716 * HWCAP_S390_DFP bit 6 (42 && 44).
717 */
718 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
719 elf_hwcap |= HWCAP_S390_DFP;
720
721 /*
722 * Huge page support HWCAP_S390_HPAGE is bit 7.
723 */
724 if (MACHINE_HAS_HPAGE)
725 elf_hwcap |= HWCAP_S390_HPAGE;
726
727 /*
728 * 64-bit register support for 31-bit processes
729 * HWCAP_S390_HIGH_GPRS is bit 9.
730 */
731 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
732
733 get_cpu_id(&cpu_id);
734 switch (cpu_id.machine) {
735 case 0x9672:
736 #if !defined(CONFIG_64BIT)
737 default: /* Use "g5" as default for 31 bit kernels. */
738 #endif
739 strcpy(elf_platform, "g5");
740 break;
741 case 0x2064:
742 case 0x2066:
743 #if defined(CONFIG_64BIT)
744 default: /* Use "z900" as default for 64 bit kernels. */
745 #endif
746 strcpy(elf_platform, "z900");
747 break;
748 case 0x2084:
749 case 0x2086:
750 strcpy(elf_platform, "z990");
751 break;
752 case 0x2094:
753 case 0x2096:
754 strcpy(elf_platform, "z9-109");
755 break;
756 case 0x2097:
757 case 0x2098:
758 strcpy(elf_platform, "z10");
759 break;
760 case 0x2817:
761 strcpy(elf_platform, "z196");
762 break;
763 }
764 }
765
766 /*
767 * Setup function called from init/main.c just after the banner
768 * was printed.
769 */
770
771 void __init
setup_arch(char ** cmdline_p)772 setup_arch(char **cmdline_p)
773 {
774 /*
775 * print what head.S has found out about the machine
776 */
777 #ifndef CONFIG_64BIT
778 if (MACHINE_IS_VM)
779 pr_info("Linux is running as a z/VM "
780 "guest operating system in 31-bit mode\n");
781 else if (MACHINE_IS_LPAR)
782 pr_info("Linux is running natively in 31-bit mode\n");
783 if (MACHINE_HAS_IEEE)
784 pr_info("The hardware system has IEEE compatible "
785 "floating point units\n");
786 else
787 pr_info("The hardware system has no IEEE compatible "
788 "floating point units\n");
789 #else /* CONFIG_64BIT */
790 if (MACHINE_IS_VM)
791 pr_info("Linux is running as a z/VM "
792 "guest operating system in 64-bit mode\n");
793 else if (MACHINE_IS_KVM)
794 pr_info("Linux is running under KVM in 64-bit mode\n");
795 else if (MACHINE_IS_LPAR)
796 pr_info("Linux is running natively in 64-bit mode\n");
797 #endif /* CONFIG_64BIT */
798
799 /* Have one command line that is parsed and saved in /proc/cmdline */
800 /* boot_command_line has been already set up in early.c */
801 *cmdline_p = boot_command_line;
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 s390_init_cpu_topology();
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 set_preferred_console();
840
841 /* Setup zfcpdump support */
842 setup_zfcpdump(console_devno);
843 }
844