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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/random.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/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/facility.h>
51#include <asm/smp.h>
52#include <asm/mmu_context.h>
53#include <asm/cpcmd.h>
54#include <asm/lowcore.h>
55#include <asm/irq.h>
56#include <asm/page.h>
57#include <asm/ptrace.h>
58#include <asm/sections.h>
59#include <asm/ebcdic.h>
60#include <asm/kvm_virtio.h>
61#include <asm/diag.h>
62#include <asm/os_info.h>
63#include <asm/sclp.h>
64#include <asm/sysinfo.h>
65#include "entry.h"
66
67
68
69
70unsigned int console_mode = 0;
71EXPORT_SYMBOL(console_mode);
72
73unsigned int console_devno = -1;
74EXPORT_SYMBOL(console_devno);
75
76unsigned int console_irq = -1;
77EXPORT_SYMBOL(console_irq);
78
79unsigned long elf_hwcap = 0;
80char elf_platform[ELF_PLATFORM_SIZE];
81
82int __initdata memory_end_set;
83unsigned long __initdata memory_end;
84unsigned long __initdata max_physmem_end;
85
86unsigned long VMALLOC_START;
87EXPORT_SYMBOL(VMALLOC_START);
88
89unsigned long VMALLOC_END;
90EXPORT_SYMBOL(VMALLOC_END);
91
92struct page *vmemmap;
93EXPORT_SYMBOL(vmemmap);
94
95unsigned long MODULES_VADDR;
96unsigned long MODULES_END;
97
98
99struct _lowcore *lowcore_ptr[NR_CPUS];
100EXPORT_SYMBOL(lowcore_ptr);
101
102
103
104
105
106
107
108#include <asm/setup.h>
109
110
111
112
113
114static int __init condev_setup(char *str)
115{
116 int vdev;
117
118 vdev = simple_strtoul(str, &str, 0);
119 if (vdev >= 0 && vdev < 65536) {
120 console_devno = vdev;
121 console_irq = -1;
122 }
123 return 1;
124}
125
126__setup("condev=", condev_setup);
127
128static void __init set_preferred_console(void)
129{
130 if (MACHINE_IS_KVM) {
131 if (sclp.has_vt220)
132 add_preferred_console("ttyS", 1, NULL);
133 else if (sclp.has_linemode)
134 add_preferred_console("ttyS", 0, NULL);
135 else
136 add_preferred_console("hvc", 0, NULL);
137 } else if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
138 add_preferred_console("ttyS", 0, NULL);
139 else if (CONSOLE_IS_3270)
140 add_preferred_console("tty3270", 0, NULL);
141}
142
143static int __init conmode_setup(char *str)
144{
145#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
146 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
147 SET_CONSOLE_SCLP;
148#endif
149#if defined(CONFIG_TN3215_CONSOLE)
150 if (strncmp(str, "3215", 5) == 0)
151 SET_CONSOLE_3215;
152#endif
153#if defined(CONFIG_TN3270_CONSOLE)
154 if (strncmp(str, "3270", 5) == 0)
155 SET_CONSOLE_3270;
156#endif
157 set_preferred_console();
158 return 1;
159}
160
161__setup("conmode=", conmode_setup);
162
163static void __init conmode_default(void)
164{
165 char query_buffer[1024];
166 char *ptr;
167
168 if (MACHINE_IS_VM) {
169 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
170 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
171 ptr = strstr(query_buffer, "SUBCHANNEL =");
172 console_irq = simple_strtoul(ptr + 13, NULL, 16);
173 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
174 ptr = strstr(query_buffer, "CONMODE");
175
176
177
178
179
180
181
182 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
183 if (ptr == NULL) {
184#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
185 SET_CONSOLE_SCLP;
186#endif
187 return;
188 }
189 if (strncmp(ptr + 8, "3270", 4) == 0) {
190#if defined(CONFIG_TN3270_CONSOLE)
191 SET_CONSOLE_3270;
192#elif defined(CONFIG_TN3215_CONSOLE)
193 SET_CONSOLE_3215;
194#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
195 SET_CONSOLE_SCLP;
196#endif
197 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
198#if defined(CONFIG_TN3215_CONSOLE)
199 SET_CONSOLE_3215;
200#elif defined(CONFIG_TN3270_CONSOLE)
201 SET_CONSOLE_3270;
202#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203 SET_CONSOLE_SCLP;
204#endif
205 }
206 } else {
207#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
208 SET_CONSOLE_SCLP;
209#endif
210 }
211}
212
213#ifdef CONFIG_CRASH_DUMP
214static void __init setup_zfcpdump(void)
215{
216 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
217 return;
218 if (OLDMEM_BASE)
219 return;
220 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
221 console_loglevel = 2;
222}
223#else
224static inline void setup_zfcpdump(void) {}
225#endif
226
227
228
229
230
231
232void machine_restart(char *command)
233{
234 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
235
236
237
238
239 console_unblank();
240 _machine_restart(command);
241}
242
243void machine_halt(void)
244{
245 if (!in_interrupt() || oops_in_progress)
246
247
248
249
250 console_unblank();
251 _machine_halt();
252}
253
254void machine_power_off(void)
255{
256 if (!in_interrupt() || oops_in_progress)
257
258
259
260
261 console_unblank();
262 _machine_power_off();
263}
264
265
266
267
268void (*pm_power_off)(void) = machine_power_off;
269EXPORT_SYMBOL_GPL(pm_power_off);
270
271static int __init early_parse_mem(char *p)
272{
273 memory_end = memparse(p, &p);
274 memory_end &= PAGE_MASK;
275 memory_end_set = 1;
276 return 0;
277}
278early_param("mem", early_parse_mem);
279
280static int __init parse_vmalloc(char *arg)
281{
282 if (!arg)
283 return -EINVAL;
284 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
285 return 0;
286}
287early_param("vmalloc", parse_vmalloc);
288
289void *restart_stack __attribute__((__section__(".data")));
290
291static void __init setup_lowcore(void)
292{
293 struct _lowcore *lc;
294
295
296
297
298 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
299 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
300 lc->restart_psw.mask = PSW_KERNEL_BITS;
301 lc->restart_psw.addr =
302 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
303 lc->external_new_psw.mask = PSW_KERNEL_BITS |
304 PSW_MASK_DAT | PSW_MASK_MCHECK;
305 lc->external_new_psw.addr =
306 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
307 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
308 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
309 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
310 lc->program_new_psw.mask = PSW_KERNEL_BITS |
311 PSW_MASK_DAT | PSW_MASK_MCHECK;
312 lc->program_new_psw.addr =
313 PSW_ADDR_AMODE | (unsigned long) pgm_check_handler;
314 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
315 lc->mcck_new_psw.addr =
316 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
317 lc->io_new_psw.mask = PSW_KERNEL_BITS |
318 PSW_MASK_DAT | PSW_MASK_MCHECK;
319 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
320 lc->clock_comparator = -1ULL;
321 lc->kernel_stack = ((unsigned long) &init_thread_union)
322 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
323 lc->async_stack = (unsigned long)
324 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
325 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
326 lc->panic_stack = (unsigned long)
327 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
328 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
329 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
330 lc->thread_info = (unsigned long) &init_thread_union;
331 lc->machine_flags = S390_lowcore.machine_flags;
332 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
333 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
334 MAX_FACILITY_BIT/8);
335 if (MACHINE_HAS_VX)
336 lc->vector_save_area_addr =
337 (unsigned long) &lc->vector_save_area;
338 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
339 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
340 lc->async_enter_timer = S390_lowcore.async_enter_timer;
341 lc->exit_timer = S390_lowcore.exit_timer;
342 lc->user_timer = S390_lowcore.user_timer;
343 lc->system_timer = S390_lowcore.system_timer;
344 lc->steal_timer = S390_lowcore.steal_timer;
345 lc->last_update_timer = S390_lowcore.last_update_timer;
346 lc->last_update_clock = S390_lowcore.last_update_clock;
347
348 restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
349 restart_stack += ASYNC_SIZE;
350
351
352
353
354
355
356 lc->restart_stack = (unsigned long) restart_stack;
357 lc->restart_fn = (unsigned long) do_restart;
358 lc->restart_data = 0;
359 lc->restart_source = -1UL;
360
361
362 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
363 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
364 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
365 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
366 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
367
368#ifdef CONFIG_SMP
369 lc->spinlock_lockval = arch_spin_lockval(0);
370#endif
371
372 set_prefix((u32)(unsigned long) lc);
373 lowcore_ptr[0] = lc;
374}
375
376static struct resource code_resource = {
377 .name = "Kernel code",
378 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
379};
380
381static struct resource data_resource = {
382 .name = "Kernel data",
383 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
384};
385
386static struct resource bss_resource = {
387 .name = "Kernel bss",
388 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
389};
390
391static struct resource __initdata *standard_resources[] = {
392 &code_resource,
393 &data_resource,
394 &bss_resource,
395};
396
397static void __init setup_resources(void)
398{
399 struct resource *res, *std_res, *sub_res;
400 struct memblock_region *reg;
401 int j;
402
403 code_resource.start = (unsigned long) &_text;
404 code_resource.end = (unsigned long) &_etext - 1;
405 data_resource.start = (unsigned long) &_etext;
406 data_resource.end = (unsigned long) &_edata - 1;
407 bss_resource.start = (unsigned long) &__bss_start;
408 bss_resource.end = (unsigned long) &__bss_stop - 1;
409
410 for_each_memblock(memory, reg) {
411 res = alloc_bootmem_low(sizeof(*res));
412 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
413
414 res->name = "System RAM";
415 res->start = reg->base;
416 res->end = reg->base + reg->size - 1;
417 request_resource(&iomem_resource, res);
418
419 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
420 std_res = standard_resources[j];
421 if (std_res->start < res->start ||
422 std_res->start > res->end)
423 continue;
424 if (std_res->end > res->end) {
425 sub_res = alloc_bootmem_low(sizeof(*sub_res));
426 *sub_res = *std_res;
427 sub_res->end = res->end;
428 std_res->start = res->end + 1;
429 request_resource(res, sub_res);
430 } else {
431 request_resource(res, std_res);
432 }
433 }
434 }
435}
436
437static void __init setup_memory_end(void)
438{
439 unsigned long vmax, vmalloc_size, tmp;
440
441
442 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
443 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
444 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
445 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
446 vmax = 1UL << 42;
447 else
448 vmax = 1UL << 53;
449
450 MODULES_END = vmax;
451 MODULES_VADDR = MODULES_END - MODULES_LEN;
452 VMALLOC_END = MODULES_VADDR;
453 VMALLOC_START = vmax - vmalloc_size;
454
455
456 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
457
458 tmp = SECTION_ALIGN_UP(tmp);
459 tmp = VMALLOC_START - tmp * sizeof(struct page);
460 tmp &= ~((vmax >> 11) - 1);
461 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
462 vmemmap = (struct page *) tmp;
463
464
465 memory_end = min(memory_end ?: max_physmem_end, tmp);
466 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
467 memblock_remove(memory_end, ULONG_MAX);
468
469 pr_notice("Max memory size: %luMB\n", memory_end >> 20);
470}
471
472static void __init setup_vmcoreinfo(void)
473{
474 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
475}
476
477#ifdef CONFIG_CRASH_DUMP
478
479
480
481
482
483
484static int kdump_mem_notifier(struct notifier_block *nb,
485 unsigned long action, void *data)
486{
487 struct memory_notify *arg = data;
488
489 if (action != MEM_GOING_OFFLINE)
490 return NOTIFY_OK;
491 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
492 return NOTIFY_BAD;
493 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
494 return NOTIFY_OK;
495 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
496 return NOTIFY_OK;
497 return NOTIFY_BAD;
498}
499
500static struct notifier_block kdump_mem_nb = {
501 .notifier_call = kdump_mem_notifier,
502};
503
504#endif
505
506
507
508
509static void reserve_memory_end(void)
510{
511#ifdef CONFIG_CRASH_DUMP
512 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
513 !OLDMEM_BASE && sclp.hsa_size) {
514 memory_end = sclp.hsa_size;
515 memory_end &= PAGE_MASK;
516 memory_end_set = 1;
517 }
518#endif
519 if (!memory_end_set)
520 return;
521 memblock_reserve(memory_end, ULONG_MAX);
522}
523
524
525
526
527static void reserve_oldmem(void)
528{
529#ifdef CONFIG_CRASH_DUMP
530 if (OLDMEM_BASE)
531
532 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
533#endif
534}
535
536
537
538
539static void remove_oldmem(void)
540{
541#ifdef CONFIG_CRASH_DUMP
542 if (OLDMEM_BASE)
543
544 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
545#endif
546}
547
548
549
550
551static void __init reserve_crashkernel(void)
552{
553#ifdef CONFIG_CRASH_DUMP
554 unsigned long long crash_base, crash_size;
555 phys_addr_t low, high;
556 int rc;
557
558 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
559 &crash_base);
560
561 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
562 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
563 if (rc || crash_size == 0)
564 return;
565
566 if (memblock.memory.regions[0].size < crash_size) {
567 pr_info("crashkernel reservation failed: %s\n",
568 "first memory chunk must be at least crashkernel size");
569 return;
570 }
571
572 low = crash_base ?: OLDMEM_BASE;
573 high = low + crash_size;
574 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
575
576 crash_base = low;
577 } else {
578
579 low = max_t(unsigned long, crash_size, sclp.hsa_size);
580 high = crash_base ? crash_base + crash_size : ULONG_MAX;
581
582 if (crash_base && crash_base < low) {
583 pr_info("crashkernel reservation failed: %s\n",
584 "crash_base too low");
585 return;
586 }
587 low = crash_base ?: low;
588 crash_base = memblock_find_in_range(low, high, crash_size,
589 KEXEC_CRASH_MEM_ALIGN);
590 }
591
592 if (!crash_base) {
593 pr_info("crashkernel reservation failed: %s\n",
594 "no suitable area found");
595 return;
596 }
597
598 if (register_memory_notifier(&kdump_mem_nb))
599 return;
600
601 if (!OLDMEM_BASE && MACHINE_IS_VM)
602 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
603 crashk_res.start = crash_base;
604 crashk_res.end = crash_base + crash_size - 1;
605 insert_resource(&iomem_resource, &crashk_res);
606 memblock_remove(crash_base, crash_size);
607 pr_info("Reserving %lluMB of memory at %lluMB "
608 "for crashkernel (System RAM: %luMB)\n",
609 crash_size >> 20, crash_base >> 20,
610 (unsigned long)memblock.memory.total_size >> 20);
611 os_info_crashkernel_add(crash_base, crash_size);
612#endif
613}
614
615
616
617
618static void __init reserve_initrd(void)
619{
620#ifdef CONFIG_BLK_DEV_INITRD
621 initrd_start = INITRD_START;
622 initrd_end = initrd_start + INITRD_SIZE;
623 memblock_reserve(INITRD_START, INITRD_SIZE);
624#endif
625}
626
627
628
629
630static void __init check_initrd(void)
631{
632#ifdef CONFIG_BLK_DEV_INITRD
633 if (INITRD_START && INITRD_SIZE &&
634 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
635 pr_err("initrd does not fit memory.\n");
636 memblock_free(INITRD_START, INITRD_SIZE);
637 initrd_start = initrd_end = 0;
638 }
639#endif
640}
641
642
643
644
645static void __init reserve_kernel(void)
646{
647 unsigned long start_pfn = PFN_UP(__pa(&_end));
648
649#ifdef CONFIG_DMA_API_DEBUG
650
651
652
653
654
655 memblock_reserve(0, PFN_PHYS(start_pfn));
656#else
657 memblock_reserve(0, (unsigned long)_ehead);
658 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
659 - (unsigned long)_stext);
660#endif
661}
662
663static void __init reserve_elfcorehdr(void)
664{
665#ifdef CONFIG_CRASH_DUMP
666 if (is_kdump_kernel())
667 memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
668 PAGE_ALIGN(elfcorehdr_size));
669#endif
670}
671
672static void __init setup_memory(void)
673{
674 struct memblock_region *reg;
675
676
677
678
679 for_each_memblock(memory, reg) {
680 storage_key_init_range(reg->base, reg->base + reg->size);
681 }
682 psw_set_key(PAGE_DEFAULT_KEY);
683
684
685 memblock_enforce_memory_limit(memblock_end_of_DRAM());
686}
687
688
689
690
691static void __init setup_hwcaps(void)
692{
693 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
694 struct cpuid cpu_id;
695 int i;
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715 for (i = 0; i < 6; i++)
716 if (test_facility(stfl_bits[i]))
717 elf_hwcap |= 1UL << i;
718
719 if (test_facility(22) && test_facility(30))
720 elf_hwcap |= HWCAP_S390_ETF3EH;
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
736 elf_hwcap |= HWCAP_S390_DFP;
737
738
739
740
741 if (MACHINE_HAS_HPAGE)
742 elf_hwcap |= HWCAP_S390_HPAGE;
743
744
745
746
747
748 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
749
750
751
752
753 if (test_facility(50) && test_facility(73))
754 elf_hwcap |= HWCAP_S390_TE;
755
756
757
758
759 if (test_facility(129))
760 elf_hwcap |= HWCAP_S390_VXRS;
761 get_cpu_id(&cpu_id);
762 add_device_randomness(&cpu_id, sizeof(cpu_id));
763 switch (cpu_id.machine) {
764 case 0x9672:
765 strcpy(elf_platform, "g5");
766 break;
767 case 0x2064:
768 case 0x2066:
769 default:
770 strcpy(elf_platform, "z900");
771 break;
772 case 0x2084:
773 case 0x2086:
774 strcpy(elf_platform, "z990");
775 break;
776 case 0x2094:
777 case 0x2096:
778 strcpy(elf_platform, "z9-109");
779 break;
780 case 0x2097:
781 case 0x2098:
782 strcpy(elf_platform, "z10");
783 break;
784 case 0x2817:
785 case 0x2818:
786 strcpy(elf_platform, "z196");
787 break;
788 case 0x2827:
789 case 0x2828:
790 strcpy(elf_platform, "zEC12");
791 break;
792 case 0x2964:
793 strcpy(elf_platform, "z13");
794 break;
795 }
796}
797
798
799
800
801static void __init setup_randomness(void)
802{
803 struct sysinfo_3_2_2 *vmms;
804
805 vmms = (struct sysinfo_3_2_2 *) alloc_page(GFP_KERNEL);
806 if (vmms && stsi(vmms, 3, 2, 2) == 0 && vmms->count)
807 add_device_randomness(&vmms, vmms->count);
808 free_page((unsigned long) vmms);
809}
810
811
812
813
814
815
816void __init setup_arch(char **cmdline_p)
817{
818
819
820
821 if (MACHINE_IS_VM)
822 pr_info("Linux is running as a z/VM "
823 "guest operating system in 64-bit mode\n");
824 else if (MACHINE_IS_KVM)
825 pr_info("Linux is running under KVM in 64-bit mode\n");
826 else if (MACHINE_IS_LPAR)
827 pr_info("Linux is running natively in 64-bit mode\n");
828
829
830
831 *cmdline_p = boot_command_line;
832
833 ROOT_DEV = Root_RAM0;
834
835
836 init_mm.start_code = PAGE_OFFSET;
837 init_mm.end_code = (unsigned long) &_etext;
838 init_mm.end_data = (unsigned long) &_edata;
839 init_mm.brk = (unsigned long) &_end;
840
841 parse_early_param();
842 os_info_init();
843 setup_ipl();
844
845
846 reserve_memory_end();
847 reserve_oldmem();
848 reserve_kernel();
849 reserve_initrd();
850 reserve_elfcorehdr();
851 memblock_allow_resize();
852
853
854 detect_memory_memblock();
855
856 remove_oldmem();
857
858
859
860
861
862
863
864 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
865
866 setup_memory_end();
867 setup_memory();
868
869 check_initrd();
870 reserve_crashkernel();
871
872
873
874
875 smp_save_dump_cpus();
876
877 setup_resources();
878 setup_vmcoreinfo();
879 setup_lowcore();
880 smp_fill_possible_mask();
881 cpu_init();
882
883
884
885
886 setup_hwcaps();
887
888
889
890
891 paging_init();
892
893
894 conmode_default();
895 set_preferred_console();
896
897
898 setup_zfcpdump();
899
900
901 setup_randomness();
902}
903