1 /*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11 /*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
15 #define KMSG_COMPONENT "setup"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18 #include <linux/errno.h>
19 #include <linux/export.h>
20 #include <linux/sched.h>
21 #include <linux/kernel.h>
22 #include <linux/memblock.h>
23 #include <linux/mm.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/user.h>
28 #include <linux/tty.h>
29 #include <linux/ioport.h>
30 #include <linux/delay.h>
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/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 #include <linux/topology.h>
43 #include <linux/ftrace.h>
44 #include <linux/kexec.h>
45 #include <linux/crash_dump.h>
46 #include <linux/memory.h>
47 #include <linux/compat.h>
48
49 #include <asm/ipl.h>
50 #include <asm/uaccess.h>
51 #include <asm/facility.h>
52 #include <asm/smp.h>
53 #include <asm/mmu_context.h>
54 #include <asm/cpcmd.h>
55 #include <asm/lowcore.h>
56 #include <asm/irq.h>
57 #include <asm/page.h>
58 #include <asm/ptrace.h>
59 #include <asm/sections.h>
60 #include <asm/ebcdic.h>
61 #include <asm/kvm_virtio.h>
62 #include <asm/diag.h>
63 #include <asm/os_info.h>
64 #include <asm/sclp.h>
65 #include "entry.h"
66
67 long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY |
68 PSW_MASK_EA | PSW_MASK_BA;
69 long psw_user_bits = PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT |
70 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK |
71 PSW_MASK_PSTATE | PSW_ASC_HOME;
72
73 /*
74 * User copy operations.
75 */
76 struct uaccess_ops uaccess;
77 EXPORT_SYMBOL(uaccess);
78
79 /*
80 * Machine setup..
81 */
82 unsigned int console_mode = 0;
83 EXPORT_SYMBOL(console_mode);
84
85 unsigned int console_devno = -1;
86 EXPORT_SYMBOL(console_devno);
87
88 unsigned int console_irq = -1;
89 EXPORT_SYMBOL(console_irq);
90
91 unsigned long elf_hwcap = 0;
92 char elf_platform[ELF_PLATFORM_SIZE];
93
94 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
95
96 int __initdata memory_end_set;
97 unsigned long __initdata memory_end;
98
99 unsigned long VMALLOC_START;
100 EXPORT_SYMBOL(VMALLOC_START);
101
102 unsigned long VMALLOC_END;
103 EXPORT_SYMBOL(VMALLOC_END);
104
105 struct page *vmemmap;
106 EXPORT_SYMBOL(vmemmap);
107
108 #ifdef CONFIG_64BIT
109 unsigned long MODULES_VADDR;
110 unsigned long MODULES_END;
111 #endif
112
113 /* An array with a pointer to the lowcore of every CPU. */
114 struct _lowcore *lowcore_ptr[NR_CPUS];
115 EXPORT_SYMBOL(lowcore_ptr);
116
117 /*
118 * This is set up by the setup-routine at boot-time
119 * for S390 need to find out, what we have to setup
120 * using address 0x10400 ...
121 */
122
123 #include <asm/setup.h>
124
125 /*
126 * condev= and conmode= setup parameter.
127 */
128
condev_setup(char * str)129 static int __init condev_setup(char *str)
130 {
131 int vdev;
132
133 vdev = simple_strtoul(str, &str, 0);
134 if (vdev >= 0 && vdev < 65536) {
135 console_devno = vdev;
136 console_irq = -1;
137 }
138 return 1;
139 }
140
141 __setup("condev=", condev_setup);
142
set_preferred_console(void)143 static void __init set_preferred_console(void)
144 {
145 if (MACHINE_IS_KVM) {
146 if (sclp_has_vt220())
147 add_preferred_console("ttyS", 1, NULL);
148 else if (sclp_has_linemode())
149 add_preferred_console("ttyS", 0, NULL);
150 else
151 add_preferred_console("hvc", 0, NULL);
152 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
153 add_preferred_console("ttyS", 0, NULL);
154 else if (CONSOLE_IS_3270)
155 add_preferred_console("tty3270", 0, NULL);
156 }
157
conmode_setup(char * str)158 static int __init conmode_setup(char *str)
159 {
160 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
161 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
162 SET_CONSOLE_SCLP;
163 #endif
164 #if defined(CONFIG_TN3215_CONSOLE)
165 if (strncmp(str, "3215", 5) == 0)
166 SET_CONSOLE_3215;
167 #endif
168 #if defined(CONFIG_TN3270_CONSOLE)
169 if (strncmp(str, "3270", 5) == 0)
170 SET_CONSOLE_3270;
171 #endif
172 set_preferred_console();
173 return 1;
174 }
175
176 __setup("conmode=", conmode_setup);
177
conmode_default(void)178 static void __init conmode_default(void)
179 {
180 char query_buffer[1024];
181 char *ptr;
182
183 if (MACHINE_IS_VM) {
184 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
185 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
186 ptr = strstr(query_buffer, "SUBCHANNEL =");
187 console_irq = simple_strtoul(ptr + 13, NULL, 16);
188 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
189 ptr = strstr(query_buffer, "CONMODE");
190 /*
191 * Set the conmode to 3215 so that the device recognition
192 * will set the cu_type of the console to 3215. If the
193 * conmode is 3270 and we don't set it back then both
194 * 3215 and the 3270 driver will try to access the console
195 * device (3215 as console and 3270 as normal tty).
196 */
197 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
198 if (ptr == NULL) {
199 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
200 SET_CONSOLE_SCLP;
201 #endif
202 return;
203 }
204 if (strncmp(ptr + 8, "3270", 4) == 0) {
205 #if defined(CONFIG_TN3270_CONSOLE)
206 SET_CONSOLE_3270;
207 #elif defined(CONFIG_TN3215_CONSOLE)
208 SET_CONSOLE_3215;
209 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
210 SET_CONSOLE_SCLP;
211 #endif
212 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
213 #if defined(CONFIG_TN3215_CONSOLE)
214 SET_CONSOLE_3215;
215 #elif defined(CONFIG_TN3270_CONSOLE)
216 SET_CONSOLE_3270;
217 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
218 SET_CONSOLE_SCLP;
219 #endif
220 }
221 } else {
222 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
223 SET_CONSOLE_SCLP;
224 #endif
225 }
226 }
227
228 #ifdef CONFIG_ZFCPDUMP
setup_zfcpdump(void)229 static void __init setup_zfcpdump(void)
230 {
231 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
232 return;
233 if (OLDMEM_BASE)
234 return;
235 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
236 console_loglevel = 2;
237 }
238 #else
setup_zfcpdump(void)239 static inline void setup_zfcpdump(void) {}
240 #endif /* CONFIG_ZFCPDUMP */
241
242 /*
243 * Reboot, halt and power_off stubs. They just call _machine_restart,
244 * _machine_halt or _machine_power_off.
245 */
246
machine_restart(char * command)247 void machine_restart(char *command)
248 {
249 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
250 /*
251 * Only unblank the console if we are called in enabled
252 * context or a bust_spinlocks cleared the way for us.
253 */
254 console_unblank();
255 _machine_restart(command);
256 }
257
machine_halt(void)258 void machine_halt(void)
259 {
260 if (!in_interrupt() || oops_in_progress)
261 /*
262 * Only unblank the console if we are called in enabled
263 * context or a bust_spinlocks cleared the way for us.
264 */
265 console_unblank();
266 _machine_halt();
267 }
268
machine_power_off(void)269 void machine_power_off(void)
270 {
271 if (!in_interrupt() || oops_in_progress)
272 /*
273 * Only unblank the console if we are called in enabled
274 * context or a bust_spinlocks cleared the way for us.
275 */
276 console_unblank();
277 _machine_power_off();
278 }
279
280 /*
281 * Dummy power off function.
282 */
283 void (*pm_power_off)(void) = machine_power_off;
284 EXPORT_SYMBOL_GPL(pm_power_off);
285
early_parse_mem(char * p)286 static int __init early_parse_mem(char *p)
287 {
288 memory_end = memparse(p, &p);
289 memory_end_set = 1;
290 return 0;
291 }
292 early_param("mem", early_parse_mem);
293
parse_vmalloc(char * arg)294 static int __init parse_vmalloc(char *arg)
295 {
296 if (!arg)
297 return -EINVAL;
298 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
299 return 0;
300 }
301 early_param("vmalloc", parse_vmalloc);
302
303 unsigned int s390_user_mode = PRIMARY_SPACE_MODE;
304 EXPORT_SYMBOL_GPL(s390_user_mode);
305
set_user_mode_primary(void)306 static void __init set_user_mode_primary(void)
307 {
308 psw_kernel_bits = (psw_kernel_bits & ~PSW_MASK_ASC) | PSW_ASC_HOME;
309 psw_user_bits = (psw_user_bits & ~PSW_MASK_ASC) | PSW_ASC_PRIMARY;
310 #ifdef CONFIG_COMPAT
311 psw32_user_bits =
312 (psw32_user_bits & ~PSW32_MASK_ASC) | PSW32_ASC_PRIMARY;
313 #endif
314 uaccess = MACHINE_HAS_MVCOS ? uaccess_mvcos_switch : uaccess_pt;
315 }
316
early_parse_user_mode(char * p)317 static int __init early_parse_user_mode(char *p)
318 {
319 if (p && strcmp(p, "primary") == 0)
320 s390_user_mode = PRIMARY_SPACE_MODE;
321 else if (!p || strcmp(p, "home") == 0)
322 s390_user_mode = HOME_SPACE_MODE;
323 else
324 return 1;
325 return 0;
326 }
327 early_param("user_mode", early_parse_user_mode);
328
setup_addressing_mode(void)329 static void __init setup_addressing_mode(void)
330 {
331 if (s390_user_mode != PRIMARY_SPACE_MODE)
332 return;
333 set_user_mode_primary();
334 if (MACHINE_HAS_MVCOS)
335 pr_info("Address spaces switched, mvcos available\n");
336 else
337 pr_info("Address spaces switched, mvcos not available\n");
338 }
339
340 void *restart_stack __attribute__((__section__(".data")));
341
setup_lowcore(void)342 static void __init setup_lowcore(void)
343 {
344 struct _lowcore *lc;
345
346 /*
347 * Setup lowcore for boot cpu
348 */
349 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
350 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
351 lc->restart_psw.mask = psw_kernel_bits;
352 lc->restart_psw.addr =
353 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
354 lc->external_new_psw.mask = psw_kernel_bits |
355 PSW_MASK_DAT | PSW_MASK_MCHECK;
356 lc->external_new_psw.addr =
357 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
358 lc->svc_new_psw.mask = psw_kernel_bits |
359 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
360 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
361 lc->program_new_psw.mask = psw_kernel_bits |
362 PSW_MASK_DAT | PSW_MASK_MCHECK;
363 lc->program_new_psw.addr =
364 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
365 lc->mcck_new_psw.mask = psw_kernel_bits;
366 lc->mcck_new_psw.addr =
367 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
368 lc->io_new_psw.mask = psw_kernel_bits |
369 PSW_MASK_DAT | PSW_MASK_MCHECK;
370 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
371 lc->clock_comparator = -1ULL;
372 lc->kernel_stack = ((unsigned long) &init_thread_union)
373 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
374 lc->async_stack = (unsigned long)
375 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
376 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
377 lc->panic_stack = (unsigned long)
378 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
379 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
380 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
381 lc->thread_info = (unsigned long) &init_thread_union;
382 lc->machine_flags = S390_lowcore.machine_flags;
383 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
384 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
385 MAX_FACILITY_BIT/8);
386 #ifndef CONFIG_64BIT
387 if (MACHINE_HAS_IEEE) {
388 lc->extended_save_area_addr = (__u32)
389 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
390 /* enable extended save area */
391 __ctl_set_bit(14, 29);
392 }
393 #else
394 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
395 #endif
396 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
397 lc->async_enter_timer = S390_lowcore.async_enter_timer;
398 lc->exit_timer = S390_lowcore.exit_timer;
399 lc->user_timer = S390_lowcore.user_timer;
400 lc->system_timer = S390_lowcore.system_timer;
401 lc->steal_timer = S390_lowcore.steal_timer;
402 lc->last_update_timer = S390_lowcore.last_update_timer;
403 lc->last_update_clock = S390_lowcore.last_update_clock;
404 lc->ftrace_func = S390_lowcore.ftrace_func;
405
406 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
407 restart_stack += ASYNC_SIZE;
408
409 /*
410 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
411 * restart data to the absolute zero lowcore. This is necesary if
412 * PSW restart is done on an offline CPU that has lowcore zero.
413 */
414 lc->restart_stack = (unsigned long) restart_stack;
415 lc->restart_fn = (unsigned long) do_restart;
416 lc->restart_data = 0;
417 lc->restart_source = -1UL;
418
419 /* Setup absolute zero lowcore */
420 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
421 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
422 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
423 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
424 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
425
426 set_prefix((u32)(unsigned long) lc);
427 lowcore_ptr[0] = lc;
428 }
429
430 static struct resource code_resource = {
431 .name = "Kernel code",
432 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
433 };
434
435 static struct resource data_resource = {
436 .name = "Kernel data",
437 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
438 };
439
440 static struct resource bss_resource = {
441 .name = "Kernel bss",
442 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
443 };
444
445 static struct resource __initdata *standard_resources[] = {
446 &code_resource,
447 &data_resource,
448 &bss_resource,
449 };
450
setup_resources(void)451 static void __init setup_resources(void)
452 {
453 struct resource *res, *std_res, *sub_res;
454 int i, j;
455
456 code_resource.start = (unsigned long) &_text;
457 code_resource.end = (unsigned long) &_etext - 1;
458 data_resource.start = (unsigned long) &_etext;
459 data_resource.end = (unsigned long) &_edata - 1;
460 bss_resource.start = (unsigned long) &__bss_start;
461 bss_resource.end = (unsigned long) &__bss_stop - 1;
462
463 for (i = 0; i < MEMORY_CHUNKS; i++) {
464 if (!memory_chunk[i].size)
465 continue;
466 res = alloc_bootmem_low(sizeof(*res));
467 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
468 switch (memory_chunk[i].type) {
469 case CHUNK_READ_WRITE:
470 res->name = "System RAM";
471 break;
472 case CHUNK_READ_ONLY:
473 res->name = "System ROM";
474 res->flags |= IORESOURCE_READONLY;
475 break;
476 default:
477 res->name = "reserved";
478 }
479 res->start = memory_chunk[i].addr;
480 res->end = res->start + memory_chunk[i].size - 1;
481 request_resource(&iomem_resource, res);
482
483 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
484 std_res = standard_resources[j];
485 if (std_res->start < res->start ||
486 std_res->start > res->end)
487 continue;
488 if (std_res->end > res->end) {
489 sub_res = alloc_bootmem_low(sizeof(*sub_res));
490 *sub_res = *std_res;
491 sub_res->end = res->end;
492 std_res->start = res->end + 1;
493 request_resource(res, sub_res);
494 } else {
495 request_resource(res, std_res);
496 }
497 }
498 }
499 }
500
setup_memory_end(void)501 static void __init setup_memory_end(void)
502 {
503 unsigned long vmax, vmalloc_size, tmp;
504 unsigned long real_memory_size = 0;
505 int i;
506
507
508 #ifdef CONFIG_ZFCPDUMP
509 if (ipl_info.type == IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) {
510 memory_end = ZFCPDUMP_HSA_SIZE;
511 memory_end_set = 1;
512 }
513 #endif
514 memory_end &= PAGE_MASK;
515
516 /*
517 * Make sure all chunks are MAX_ORDER aligned so we don't need the
518 * extra checks that HOLES_IN_ZONE would require.
519 */
520 for (i = 0; i < MEMORY_CHUNKS; i++) {
521 unsigned long start, end;
522 struct mem_chunk *chunk;
523 unsigned long align;
524
525 chunk = &memory_chunk[i];
526 if (!chunk->size)
527 continue;
528 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
529 start = (chunk->addr + align - 1) & ~(align - 1);
530 end = (chunk->addr + chunk->size) & ~(align - 1);
531 if (start >= end)
532 memset(chunk, 0, sizeof(*chunk));
533 else {
534 chunk->addr = start;
535 chunk->size = end - start;
536 }
537 real_memory_size = max(real_memory_size,
538 chunk->addr + chunk->size);
539 }
540
541 /* Choose kernel address space layout: 2, 3, or 4 levels. */
542 #ifdef CONFIG_64BIT
543 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
544 tmp = (memory_end ?: real_memory_size) / PAGE_SIZE;
545 tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
546 if (tmp <= (1UL << 42))
547 vmax = 1UL << 42; /* 3-level kernel page table */
548 else
549 vmax = 1UL << 53; /* 4-level kernel page table */
550 /* module area is at the end of the kernel address space. */
551 MODULES_END = vmax;
552 MODULES_VADDR = MODULES_END - MODULES_LEN;
553 VMALLOC_END = MODULES_VADDR;
554 #else
555 vmalloc_size = VMALLOC_END ?: 96UL << 20;
556 vmax = 1UL << 31; /* 2-level kernel page table */
557 /* vmalloc area is at the end of the kernel address space. */
558 VMALLOC_END = vmax;
559 #endif
560 VMALLOC_START = vmax - vmalloc_size;
561
562 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
563 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
564 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
565 tmp = SECTION_ALIGN_UP(tmp);
566 tmp = VMALLOC_START - tmp * sizeof(struct page);
567 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
568 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
569 vmemmap = (struct page *) tmp;
570
571 /* Take care that memory_end is set and <= vmemmap */
572 memory_end = min(memory_end ?: real_memory_size, tmp);
573
574 /* Fixup memory chunk array to fit into 0..memory_end */
575 for (i = 0; i < MEMORY_CHUNKS; i++) {
576 struct mem_chunk *chunk = &memory_chunk[i];
577
578 if (!chunk->size)
579 continue;
580 if (chunk->addr >= memory_end) {
581 memset(chunk, 0, sizeof(*chunk));
582 continue;
583 }
584 if (chunk->addr + chunk->size > memory_end)
585 chunk->size = memory_end - chunk->addr;
586 }
587 }
588
setup_vmcoreinfo(void)589 static void __init setup_vmcoreinfo(void)
590 {
591 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
592 }
593
594 #ifdef CONFIG_CRASH_DUMP
595
596 /*
597 * Find suitable location for crashkernel memory
598 */
find_crash_base(unsigned long crash_size,char ** msg)599 static unsigned long __init find_crash_base(unsigned long crash_size,
600 char **msg)
601 {
602 unsigned long crash_base;
603 struct mem_chunk *chunk;
604 int i;
605
606 if (memory_chunk[0].size < crash_size) {
607 *msg = "first memory chunk must be at least crashkernel size";
608 return 0;
609 }
610 if (OLDMEM_BASE && crash_size == OLDMEM_SIZE)
611 return OLDMEM_BASE;
612
613 for (i = MEMORY_CHUNKS - 1; i >= 0; i--) {
614 chunk = &memory_chunk[i];
615 if (chunk->size == 0)
616 continue;
617 if (chunk->type != CHUNK_READ_WRITE)
618 continue;
619 if (chunk->size < crash_size)
620 continue;
621 crash_base = (chunk->addr + chunk->size) - crash_size;
622 if (crash_base < crash_size)
623 continue;
624 if (crash_base < ZFCPDUMP_HSA_SIZE_MAX)
625 continue;
626 if (crash_base < (unsigned long) INITRD_START + INITRD_SIZE)
627 continue;
628 return crash_base;
629 }
630 *msg = "no suitable area found";
631 return 0;
632 }
633
634 /*
635 * Check if crash_base and crash_size is valid
636 */
verify_crash_base(unsigned long crash_base,unsigned long crash_size,char ** msg)637 static int __init verify_crash_base(unsigned long crash_base,
638 unsigned long crash_size,
639 char **msg)
640 {
641 struct mem_chunk *chunk;
642 int i;
643
644 /*
645 * Because we do the swap to zero, we must have at least 'crash_size'
646 * bytes free space before crash_base
647 */
648 if (crash_size > crash_base) {
649 *msg = "crashkernel offset must be greater than size";
650 return -EINVAL;
651 }
652
653 /* First memory chunk must be at least crash_size */
654 if (memory_chunk[0].size < crash_size) {
655 *msg = "first memory chunk must be at least crashkernel size";
656 return -EINVAL;
657 }
658 /* Check if we fit into the respective memory chunk */
659 for (i = 0; i < MEMORY_CHUNKS; i++) {
660 chunk = &memory_chunk[i];
661 if (chunk->size == 0)
662 continue;
663 if (crash_base < chunk->addr)
664 continue;
665 if (crash_base >= chunk->addr + chunk->size)
666 continue;
667 /* we have found the memory chunk */
668 if (crash_base + crash_size > chunk->addr + chunk->size) {
669 *msg = "selected memory chunk is too small for "
670 "crashkernel memory";
671 return -EINVAL;
672 }
673 return 0;
674 }
675 *msg = "invalid memory range specified";
676 return -EINVAL;
677 }
678
679 /*
680 * When kdump is enabled, we have to ensure that no memory from
681 * the area [0 - crashkernel memory size] and
682 * [crashk_res.start - crashk_res.end] is set offline.
683 */
kdump_mem_notifier(struct notifier_block * nb,unsigned long action,void * data)684 static int kdump_mem_notifier(struct notifier_block *nb,
685 unsigned long action, void *data)
686 {
687 struct memory_notify *arg = data;
688
689 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
690 return NOTIFY_BAD;
691 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
692 return NOTIFY_OK;
693 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
694 return NOTIFY_OK;
695 return NOTIFY_BAD;
696 }
697
698 static struct notifier_block kdump_mem_nb = {
699 .notifier_call = kdump_mem_notifier,
700 };
701
702 #endif
703
704 /*
705 * Make sure that oldmem, where the dump is stored, is protected
706 */
reserve_oldmem(void)707 static void reserve_oldmem(void)
708 {
709 #ifdef CONFIG_CRASH_DUMP
710 unsigned long real_size = 0;
711 int i;
712
713 if (!OLDMEM_BASE)
714 return;
715 for (i = 0; i < MEMORY_CHUNKS; i++) {
716 struct mem_chunk *chunk = &memory_chunk[i];
717
718 real_size = max(real_size, chunk->addr + chunk->size);
719 }
720 create_mem_hole(memory_chunk, OLDMEM_BASE, OLDMEM_SIZE);
721 create_mem_hole(memory_chunk, OLDMEM_SIZE, real_size - OLDMEM_SIZE);
722 if (OLDMEM_BASE + OLDMEM_SIZE == real_size)
723 saved_max_pfn = PFN_DOWN(OLDMEM_BASE) - 1;
724 else
725 saved_max_pfn = PFN_DOWN(real_size) - 1;
726 #endif
727 }
728
729 /*
730 * Reserve memory for kdump kernel to be loaded with kexec
731 */
reserve_crashkernel(void)732 static void __init reserve_crashkernel(void)
733 {
734 #ifdef CONFIG_CRASH_DUMP
735 unsigned long long crash_base, crash_size;
736 char *msg = NULL;
737 int rc;
738
739 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
740 &crash_base);
741 if (rc || crash_size == 0)
742 return;
743 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
744 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
745 if (register_memory_notifier(&kdump_mem_nb))
746 return;
747 if (!crash_base)
748 crash_base = find_crash_base(crash_size, &msg);
749 if (!crash_base) {
750 pr_info("crashkernel reservation failed: %s\n", msg);
751 unregister_memory_notifier(&kdump_mem_nb);
752 return;
753 }
754 if (verify_crash_base(crash_base, crash_size, &msg)) {
755 pr_info("crashkernel reservation failed: %s\n", msg);
756 unregister_memory_notifier(&kdump_mem_nb);
757 return;
758 }
759 if (!OLDMEM_BASE && MACHINE_IS_VM)
760 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
761 crashk_res.start = crash_base;
762 crashk_res.end = crash_base + crash_size - 1;
763 insert_resource(&iomem_resource, &crashk_res);
764 create_mem_hole(memory_chunk, crash_base, crash_size);
765 pr_info("Reserving %lluMB of memory at %lluMB "
766 "for crashkernel (System RAM: %luMB)\n",
767 crash_size >> 20, crash_base >> 20, memory_end >> 20);
768 os_info_crashkernel_add(crash_base, crash_size);
769 #endif
770 }
771
setup_memory(void)772 static void __init setup_memory(void)
773 {
774 unsigned long bootmap_size;
775 unsigned long start_pfn, end_pfn;
776 int i;
777
778 /*
779 * partially used pages are not usable - thus
780 * we are rounding upwards:
781 */
782 start_pfn = PFN_UP(__pa(&_end));
783 end_pfn = max_pfn = PFN_DOWN(memory_end);
784
785 #ifdef CONFIG_BLK_DEV_INITRD
786 /*
787 * Move the initrd in case the bitmap of the bootmem allocater
788 * would overwrite it.
789 */
790
791 if (INITRD_START && INITRD_SIZE) {
792 unsigned long bmap_size;
793 unsigned long start;
794
795 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
796 bmap_size = PFN_PHYS(bmap_size);
797
798 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
799 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
800
801 #ifdef CONFIG_CRASH_DUMP
802 if (OLDMEM_BASE) {
803 /* Move initrd behind kdump oldmem */
804 if (start + INITRD_SIZE > OLDMEM_BASE &&
805 start < OLDMEM_BASE + OLDMEM_SIZE)
806 start = OLDMEM_BASE + OLDMEM_SIZE;
807 }
808 #endif
809 if (start + INITRD_SIZE > memory_end) {
810 pr_err("initrd extends beyond end of "
811 "memory (0x%08lx > 0x%08lx) "
812 "disabling initrd\n",
813 start + INITRD_SIZE, memory_end);
814 INITRD_START = INITRD_SIZE = 0;
815 } else {
816 pr_info("Moving initrd (0x%08lx -> "
817 "0x%08lx, size: %ld)\n",
818 INITRD_START, start, INITRD_SIZE);
819 memmove((void *) start, (void *) INITRD_START,
820 INITRD_SIZE);
821 INITRD_START = start;
822 }
823 }
824 }
825 #endif
826
827 /*
828 * Initialize the boot-time allocator
829 */
830 bootmap_size = init_bootmem(start_pfn, end_pfn);
831
832 /*
833 * Register RAM areas with the bootmem allocator.
834 */
835
836 for (i = 0; i < MEMORY_CHUNKS; i++) {
837 unsigned long start_chunk, end_chunk, pfn;
838
839 if (!memory_chunk[i].size)
840 continue;
841 start_chunk = PFN_DOWN(memory_chunk[i].addr);
842 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
843 end_chunk = min(end_chunk, end_pfn);
844 if (start_chunk >= end_chunk)
845 continue;
846 memblock_add_node(PFN_PHYS(start_chunk),
847 PFN_PHYS(end_chunk - start_chunk), 0);
848 pfn = max(start_chunk, start_pfn);
849 storage_key_init_range(PFN_PHYS(pfn), PFN_PHYS(end_chunk));
850 }
851
852 psw_set_key(PAGE_DEFAULT_KEY);
853
854 free_bootmem_with_active_regions(0, max_pfn);
855
856 /*
857 * Reserve memory used for lowcore/command line/kernel image.
858 */
859 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
860 reserve_bootmem((unsigned long)_stext,
861 PFN_PHYS(start_pfn) - (unsigned long)_stext,
862 BOOTMEM_DEFAULT);
863 /*
864 * Reserve the bootmem bitmap itself as well. We do this in two
865 * steps (first step was init_bootmem()) because this catches
866 * the (very unlikely) case of us accidentally initializing the
867 * bootmem allocator with an invalid RAM area.
868 */
869 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
870 BOOTMEM_DEFAULT);
871
872 #ifdef CONFIG_CRASH_DUMP
873 if (crashk_res.start)
874 reserve_bootmem(crashk_res.start,
875 crashk_res.end - crashk_res.start + 1,
876 BOOTMEM_DEFAULT);
877 if (is_kdump_kernel())
878 reserve_bootmem(elfcorehdr_addr - OLDMEM_BASE,
879 PAGE_ALIGN(elfcorehdr_size), BOOTMEM_DEFAULT);
880 #endif
881 #ifdef CONFIG_BLK_DEV_INITRD
882 if (INITRD_START && INITRD_SIZE) {
883 if (INITRD_START + INITRD_SIZE <= memory_end) {
884 reserve_bootmem(INITRD_START, INITRD_SIZE,
885 BOOTMEM_DEFAULT);
886 initrd_start = INITRD_START;
887 initrd_end = initrd_start + INITRD_SIZE;
888 } else {
889 pr_err("initrd extends beyond end of "
890 "memory (0x%08lx > 0x%08lx) "
891 "disabling initrd\n",
892 initrd_start + INITRD_SIZE, memory_end);
893 initrd_start = initrd_end = 0;
894 }
895 }
896 #endif
897 }
898
899 /*
900 * Setup hardware capabilities.
901 */
setup_hwcaps(void)902 static void __init setup_hwcaps(void)
903 {
904 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
905 struct cpuid cpu_id;
906 int i;
907
908 /*
909 * The store facility list bits numbers as found in the principles
910 * of operation are numbered with bit 1UL<<31 as number 0 to
911 * bit 1UL<<0 as number 31.
912 * Bit 0: instructions named N3, "backported" to esa-mode
913 * Bit 2: z/Architecture mode is active
914 * Bit 7: the store-facility-list-extended facility is installed
915 * Bit 17: the message-security assist is installed
916 * Bit 19: the long-displacement facility is installed
917 * Bit 21: the extended-immediate facility is installed
918 * Bit 22: extended-translation facility 3 is installed
919 * Bit 30: extended-translation facility 3 enhancement facility
920 * These get translated to:
921 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
922 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
923 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
924 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
925 */
926 for (i = 0; i < 6; i++)
927 if (test_facility(stfl_bits[i]))
928 elf_hwcap |= 1UL << i;
929
930 if (test_facility(22) && test_facility(30))
931 elf_hwcap |= HWCAP_S390_ETF3EH;
932
933 /*
934 * Check for additional facilities with store-facility-list-extended.
935 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
936 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
937 * as stored by stfl, bits 32-xxx contain additional facilities.
938 * How many facility words are stored depends on the number of
939 * doublewords passed to the instruction. The additional facilities
940 * are:
941 * Bit 42: decimal floating point facility is installed
942 * Bit 44: perform floating point operation facility is installed
943 * translated to:
944 * HWCAP_S390_DFP bit 6 (42 && 44).
945 */
946 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
947 elf_hwcap |= HWCAP_S390_DFP;
948
949 /*
950 * Huge page support HWCAP_S390_HPAGE is bit 7.
951 */
952 if (MACHINE_HAS_HPAGE)
953 elf_hwcap |= HWCAP_S390_HPAGE;
954
955 #if defined(CONFIG_64BIT)
956 /*
957 * 64-bit register support for 31-bit processes
958 * HWCAP_S390_HIGH_GPRS is bit 9.
959 */
960 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
961
962 /*
963 * Transactional execution support HWCAP_S390_TE is bit 10.
964 */
965 if (test_facility(50) && test_facility(73))
966 elf_hwcap |= HWCAP_S390_TE;
967 #endif
968
969 get_cpu_id(&cpu_id);
970 switch (cpu_id.machine) {
971 case 0x9672:
972 #if !defined(CONFIG_64BIT)
973 default: /* Use "g5" as default for 31 bit kernels. */
974 #endif
975 strcpy(elf_platform, "g5");
976 break;
977 case 0x2064:
978 case 0x2066:
979 #if defined(CONFIG_64BIT)
980 default: /* Use "z900" as default for 64 bit kernels. */
981 #endif
982 strcpy(elf_platform, "z900");
983 break;
984 case 0x2084:
985 case 0x2086:
986 strcpy(elf_platform, "z990");
987 break;
988 case 0x2094:
989 case 0x2096:
990 strcpy(elf_platform, "z9-109");
991 break;
992 case 0x2097:
993 case 0x2098:
994 strcpy(elf_platform, "z10");
995 break;
996 case 0x2817:
997 case 0x2818:
998 strcpy(elf_platform, "z196");
999 break;
1000 case 0x2827:
1001 strcpy(elf_platform, "zEC12");
1002 break;
1003 }
1004 }
1005
1006 /*
1007 * Setup function called from init/main.c just after the banner
1008 * was printed.
1009 */
1010
setup_arch(char ** cmdline_p)1011 void __init setup_arch(char **cmdline_p)
1012 {
1013 /*
1014 * print what head.S has found out about the machine
1015 */
1016 #ifndef CONFIG_64BIT
1017 if (MACHINE_IS_VM)
1018 pr_info("Linux is running as a z/VM "
1019 "guest operating system in 31-bit mode\n");
1020 else if (MACHINE_IS_LPAR)
1021 pr_info("Linux is running natively in 31-bit mode\n");
1022 if (MACHINE_HAS_IEEE)
1023 pr_info("The hardware system has IEEE compatible "
1024 "floating point units\n");
1025 else
1026 pr_info("The hardware system has no IEEE compatible "
1027 "floating point units\n");
1028 #else /* CONFIG_64BIT */
1029 if (MACHINE_IS_VM)
1030 pr_info("Linux is running as a z/VM "
1031 "guest operating system in 64-bit mode\n");
1032 else if (MACHINE_IS_KVM)
1033 pr_info("Linux is running under KVM in 64-bit mode\n");
1034 else if (MACHINE_IS_LPAR)
1035 pr_info("Linux is running natively in 64-bit mode\n");
1036 #endif /* CONFIG_64BIT */
1037
1038 /* Have one command line that is parsed and saved in /proc/cmdline */
1039 /* boot_command_line has been already set up in early.c */
1040 *cmdline_p = boot_command_line;
1041
1042 ROOT_DEV = Root_RAM0;
1043
1044 init_mm.start_code = PAGE_OFFSET;
1045 init_mm.end_code = (unsigned long) &_etext;
1046 init_mm.end_data = (unsigned long) &_edata;
1047 init_mm.brk = (unsigned long) &_end;
1048
1049 if (MACHINE_HAS_MVCOS)
1050 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
1051 else
1052 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
1053
1054 parse_early_param();
1055 detect_memory_layout(memory_chunk, memory_end);
1056 os_info_init();
1057 setup_ipl();
1058 reserve_oldmem();
1059 setup_memory_end();
1060 setup_addressing_mode();
1061 reserve_crashkernel();
1062 setup_memory();
1063 setup_resources();
1064 setup_vmcoreinfo();
1065 setup_lowcore();
1066
1067 cpu_init();
1068 s390_init_cpu_topology();
1069
1070 /*
1071 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
1072 */
1073 setup_hwcaps();
1074
1075 /*
1076 * Create kernel page tables and switch to virtual addressing.
1077 */
1078 paging_init();
1079
1080 /* Setup default console */
1081 conmode_default();
1082 set_preferred_console();
1083
1084 /* Setup zfcpdump support */
1085 setup_zfcpdump();
1086 }
1087