2 * arch/s390/kernel/setup.c
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)
9 * Derived from "arch/i386/kernel/setup.c"
10 * Copyright (C) 1995, Linus Torvalds
14 * This file handles the architecture-dependent parts of initialization
17 #define KMSG_COMPONENT "setup"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
20 #include <linux/errno.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/kernel.h>
25 #include <linux/stddef.h>
26 #include <linux/unistd.h>
27 #include <linux/ptrace.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/tty.h>
31 #include <linux/ioport.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/initrd.h>
35 #include <linux/bootmem.h>
36 #include <linux/root_dev.h>
37 #include <linux/console.h>
38 #include <linux/kernel_stat.h>
39 #include <linux/device.h>
40 #include <linux/notifier.h>
41 #include <linux/pfn.h>
42 #include <linux/ctype.h>
43 #include <linux/reboot.h>
44 #include <linux/topology.h>
47 #include <asm/uaccess.h>
48 #include <asm/system.h>
50 #include <asm/mmu_context.h>
51 #include <asm/cpcmd.h>
52 #include <asm/lowcore.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>
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);
68 * User copy operations.
70 struct uaccess_ops uaccess;
71 EXPORT_SYMBOL(uaccess);
76 unsigned int console_mode = 0;
77 EXPORT_SYMBOL(console_mode);
79 unsigned int console_devno = -1;
80 EXPORT_SYMBOL(console_devno);
82 unsigned int console_irq = -1;
83 EXPORT_SYMBOL(console_irq);
85 unsigned long elf_hwcap = 0;
86 char elf_platform[ELF_PLATFORM_SIZE];
88 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
89 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
91 int __initdata memory_end_set;
92 unsigned long __initdata memory_end;
94 /* An array with a pointer to the lowcore of every CPU. */
95 struct _lowcore *lowcore_ptr[NR_CPUS];
96 EXPORT_SYMBOL(lowcore_ptr);
99 * This is set up by the setup-routine at boot-time
100 * for S390 need to find out, what we have to setup
101 * using address 0x10400 ...
104 #include <asm/setup.h>
106 static struct resource code_resource = {
107 .name = "Kernel code",
108 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
111 static struct resource data_resource = {
112 .name = "Kernel data",
113 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
117 * cpu_init() initializes state that is per-CPU.
119 void __cpuinit cpu_init(void)
122 * Store processor id in lowcore (used e.g. in timer_interrupt)
124 get_cpu_id(&S390_lowcore.cpu_id);
127 * Force FPU initialization:
129 clear_thread_flag(TIF_USEDFPU);
132 atomic_inc(&init_mm.mm_count);
133 current->active_mm = &init_mm;
135 enter_lazy_tlb(&init_mm, current);
139 * condev= and conmode= setup parameter.
142 static int __init condev_setup(char *str)
146 vdev = simple_strtoul(str, &str, 0);
147 if (vdev >= 0 && vdev < 65536) {
148 console_devno = vdev;
154 __setup("condev=", condev_setup);
156 static int __init conmode_setup(char *str)
158 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
159 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
162 #if defined(CONFIG_TN3215_CONSOLE)
163 if (strncmp(str, "3215", 5) == 0)
166 #if defined(CONFIG_TN3270_CONSOLE)
167 if (strncmp(str, "3270", 5) == 0)
173 __setup("conmode=", conmode_setup);
175 static void __init conmode_default(void)
177 char query_buffer[1024];
181 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
182 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
183 ptr = strstr(query_buffer, "SUBCHANNEL =");
184 console_irq = simple_strtoul(ptr + 13, NULL, 16);
185 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
186 ptr = strstr(query_buffer, "CONMODE");
188 * Set the conmode to 3215 so that the device recognition
189 * will set the cu_type of the console to 3215. If the
190 * conmode is 3270 and we don't set it back then both
191 * 3215 and the 3270 driver will try to access the console
192 * device (3215 as console and 3270 as normal tty).
194 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
196 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
201 if (strncmp(ptr + 8, "3270", 4) == 0) {
202 #if defined(CONFIG_TN3270_CONSOLE)
204 #elif defined(CONFIG_TN3215_CONSOLE)
206 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
209 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
210 #if defined(CONFIG_TN3215_CONSOLE)
212 #elif defined(CONFIG_TN3270_CONSOLE)
214 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
219 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
225 #ifdef CONFIG_ZFCPDUMP
226 static void __init setup_zfcpdump(unsigned int console_devno)
230 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
232 if (console_devno != -1)
233 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
234 ipl_info.data.fcp.dev_id.devno, console_devno);
236 sprintf(str, " cio_ignore=all,!0.0.%04x",
237 ipl_info.data.fcp.dev_id.devno);
238 strcat(boot_command_line, str);
239 console_loglevel = 2;
242 static inline void setup_zfcpdump(unsigned int console_devno) {}
243 #endif /* CONFIG_ZFCPDUMP */
246 * Reboot, halt and power_off stubs. They just call _machine_restart,
247 * _machine_halt or _machine_power_off.
250 void machine_restart(char *command)
252 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
254 * Only unblank the console if we are called in enabled
255 * context or a bust_spinlocks cleared the way for us.
258 _machine_restart(command);
261 void machine_halt(void)
263 if (!in_interrupt() || oops_in_progress)
265 * Only unblank the console if we are called in enabled
266 * context or a bust_spinlocks cleared the way for us.
272 void machine_power_off(void)
274 if (!in_interrupt() || oops_in_progress)
276 * Only unblank the console if we are called in enabled
277 * context or a bust_spinlocks cleared the way for us.
280 _machine_power_off();
284 * Dummy power off function.
286 void (*pm_power_off)(void) = machine_power_off;
288 static int __init early_parse_mem(char *p)
290 memory_end = memparse(p, &p);
294 early_param("mem", early_parse_mem);
296 #ifdef CONFIG_S390_SWITCH_AMODE
297 unsigned int switch_amode = 0;
298 EXPORT_SYMBOL_GPL(switch_amode);
300 static int set_amode_and_uaccess(unsigned long user_amode,
301 unsigned long user32_amode)
303 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
304 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
305 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
307 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
308 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
309 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
310 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
311 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
314 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
315 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
317 if (MACHINE_HAS_MVCOS) {
318 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
321 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
327 * Switch kernel/user addressing modes?
329 static int __init early_parse_switch_amode(char *p)
334 early_param("switch_amode", early_parse_switch_amode);
336 #else /* CONFIG_S390_SWITCH_AMODE */
337 static inline int set_amode_and_uaccess(unsigned long user_amode,
338 unsigned long user32_amode)
342 #endif /* CONFIG_S390_SWITCH_AMODE */
344 #ifdef CONFIG_S390_EXEC_PROTECT
345 unsigned int s390_noexec = 0;
346 EXPORT_SYMBOL_GPL(s390_noexec);
349 * Enable execute protection?
351 static int __init early_parse_noexec(char *p)
353 if (!strncmp(p, "off", 3))
359 early_param("noexec", early_parse_noexec);
360 #endif /* CONFIG_S390_EXEC_PROTECT */
362 static void setup_addressing_mode(void)
365 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
366 PSW32_ASC_SECONDARY))
367 pr_info("Execute protection active, "
368 "mvcos available\n");
370 pr_info("Execute protection active, "
371 "mvcos not available\n");
372 } else if (switch_amode) {
373 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
374 pr_info("Address spaces switched, "
375 "mvcos available\n");
377 pr_info("Address spaces switched, "
378 "mvcos not available\n");
380 #ifdef CONFIG_TRACE_IRQFLAGS
381 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
382 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
393 * Setup lowcore for boot cpu
395 lc_pages = sizeof(void *) == 8 ? 2 : 1;
396 lc = (struct _lowcore *)
397 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
398 memset(lc, 0, lc_pages * PAGE_SIZE);
399 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
400 lc->restart_psw.addr =
401 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
403 lc->restart_psw.mask |= PSW_ASC_HOME;
404 lc->external_new_psw.mask = psw_kernel_bits;
405 lc->external_new_psw.addr =
406 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
407 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
408 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
409 lc->program_new_psw.mask = psw_kernel_bits;
410 lc->program_new_psw.addr =
411 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
412 lc->mcck_new_psw.mask =
413 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
414 lc->mcck_new_psw.addr =
415 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
416 lc->io_new_psw.mask = psw_kernel_bits;
417 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
418 lc->clock_comparator = -1ULL;
419 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
420 lc->async_stack = (unsigned long)
421 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
422 lc->panic_stack = (unsigned long)
423 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
424 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
425 lc->thread_info = (unsigned long) &init_thread_union;
426 lc->machine_flags = S390_lowcore.machine_flags;
428 if (MACHINE_HAS_IEEE) {
429 lc->extended_save_area_addr = (__u32)
430 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
431 /* enable extended save area */
432 __ctl_set_bit(14, 29);
435 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
437 set_prefix((u32)(unsigned long) lc);
442 setup_resources(void)
444 struct resource *res, *sub_res;
447 code_resource.start = (unsigned long) &_text;
448 code_resource.end = (unsigned long) &_etext - 1;
449 data_resource.start = (unsigned long) &_etext;
450 data_resource.end = (unsigned long) &_edata - 1;
452 for (i = 0; i < MEMORY_CHUNKS; i++) {
453 if (!memory_chunk[i].size)
455 res = alloc_bootmem_low(sizeof(struct resource));
456 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
457 switch (memory_chunk[i].type) {
458 case CHUNK_READ_WRITE:
459 res->name = "System RAM";
461 case CHUNK_READ_ONLY:
462 res->name = "System ROM";
463 res->flags |= IORESOURCE_READONLY;
466 res->name = "reserved";
468 res->start = memory_chunk[i].addr;
469 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
470 request_resource(&iomem_resource, res);
472 if (code_resource.start >= res->start &&
473 code_resource.start <= res->end &&
474 code_resource.end > res->end) {
475 sub_res = alloc_bootmem_low(sizeof(struct resource));
476 memcpy(sub_res, &code_resource,
477 sizeof(struct resource));
478 sub_res->end = res->end;
479 code_resource.start = res->end + 1;
480 request_resource(res, sub_res);
483 if (code_resource.start >= res->start &&
484 code_resource.start <= res->end &&
485 code_resource.end <= res->end)
486 request_resource(res, &code_resource);
488 if (data_resource.start >= res->start &&
489 data_resource.start <= res->end &&
490 data_resource.end > res->end) {
491 sub_res = alloc_bootmem_low(sizeof(struct resource));
492 memcpy(sub_res, &data_resource,
493 sizeof(struct resource));
494 sub_res->end = res->end;
495 data_resource.start = res->end + 1;
496 request_resource(res, sub_res);
499 if (data_resource.start >= res->start &&
500 data_resource.start <= res->end &&
501 data_resource.end <= res->end)
502 request_resource(res, &data_resource);
506 unsigned long real_memory_size;
507 EXPORT_SYMBOL_GPL(real_memory_size);
509 static void __init setup_memory_end(void)
511 unsigned long memory_size;
512 unsigned long max_mem;
515 #ifdef CONFIG_ZFCPDUMP
516 if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
517 memory_end = ZFCPDUMP_HSA_SIZE;
522 memory_end &= PAGE_MASK;
524 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
525 memory_end = min(max_mem, memory_end);
528 * Make sure all chunks are MAX_ORDER aligned so we don't need the
529 * extra checks that HOLES_IN_ZONE would require.
531 for (i = 0; i < MEMORY_CHUNKS; i++) {
532 unsigned long start, end;
533 struct mem_chunk *chunk;
536 chunk = &memory_chunk[i];
537 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
538 start = (chunk->addr + align - 1) & ~(align - 1);
539 end = (chunk->addr + chunk->size) & ~(align - 1);
541 memset(chunk, 0, sizeof(*chunk));
544 chunk->size = end - start;
548 for (i = 0; i < MEMORY_CHUNKS; i++) {
549 struct mem_chunk *chunk = &memory_chunk[i];
551 real_memory_size = max(real_memory_size,
552 chunk->addr + chunk->size);
553 if (chunk->addr >= max_mem) {
554 memset(chunk, 0, sizeof(*chunk));
557 if (chunk->addr + chunk->size > max_mem)
558 chunk->size = max_mem - chunk->addr;
559 memory_size = max(memory_size, chunk->addr + chunk->size);
562 memory_end = memory_size;
568 unsigned long bootmap_size;
569 unsigned long start_pfn, end_pfn;
573 * partially used pages are not usable - thus
574 * we are rounding upwards:
576 start_pfn = PFN_UP(__pa(&_end));
577 end_pfn = max_pfn = PFN_DOWN(memory_end);
579 #ifdef CONFIG_BLK_DEV_INITRD
581 * Move the initrd in case the bitmap of the bootmem allocater
582 * would overwrite it.
585 if (INITRD_START && INITRD_SIZE) {
586 unsigned long bmap_size;
589 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
590 bmap_size = PFN_PHYS(bmap_size);
592 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
593 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
595 if (start + INITRD_SIZE > memory_end) {
596 pr_err("initrd extends beyond end of "
597 "memory (0x%08lx > 0x%08lx) "
598 "disabling initrd\n",
599 start + INITRD_SIZE, memory_end);
600 INITRD_START = INITRD_SIZE = 0;
602 pr_info("Moving initrd (0x%08lx -> "
603 "0x%08lx, size: %ld)\n",
604 INITRD_START, start, INITRD_SIZE);
605 memmove((void *) start, (void *) INITRD_START,
607 INITRD_START = start;
614 * Initialize the boot-time allocator
616 bootmap_size = init_bootmem(start_pfn, end_pfn);
619 * Register RAM areas with the bootmem allocator.
622 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
623 unsigned long start_chunk, end_chunk, pfn;
625 if (memory_chunk[i].type != CHUNK_READ_WRITE)
627 start_chunk = PFN_DOWN(memory_chunk[i].addr);
628 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
629 end_chunk = min(end_chunk, end_pfn);
630 if (start_chunk >= end_chunk)
632 add_active_range(0, start_chunk, end_chunk);
633 pfn = max(start_chunk, start_pfn);
634 for (; pfn < end_chunk; pfn++)
635 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
638 psw_set_key(PAGE_DEFAULT_KEY);
640 free_bootmem_with_active_regions(0, max_pfn);
643 * Reserve memory used for lowcore/command line/kernel image.
645 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
646 reserve_bootmem((unsigned long)_stext,
647 PFN_PHYS(start_pfn) - (unsigned long)_stext,
650 * Reserve the bootmem bitmap itself as well. We do this in two
651 * steps (first step was init_bootmem()) because this catches
652 * the (very unlikely) case of us accidentally initializing the
653 * bootmem allocator with an invalid RAM area.
655 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
658 #ifdef CONFIG_BLK_DEV_INITRD
659 if (INITRD_START && INITRD_SIZE) {
660 if (INITRD_START + INITRD_SIZE <= memory_end) {
661 reserve_bootmem(INITRD_START, INITRD_SIZE,
663 initrd_start = INITRD_START;
664 initrd_end = initrd_start + INITRD_SIZE;
666 pr_err("initrd extends beyond end of "
667 "memory (0x%08lx > 0x%08lx) "
668 "disabling initrd\n",
669 initrd_start + INITRD_SIZE, memory_end);
670 initrd_start = initrd_end = 0;
677 * Setup hardware capabilities.
679 static void __init setup_hwcaps(void)
681 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
682 unsigned long long facility_list_extended;
683 unsigned int facility_list;
686 facility_list = stfl();
688 * The store facility list bits numbers as found in the principles
689 * of operation are numbered with bit 1UL<<31 as number 0 to
690 * bit 1UL<<0 as number 31.
691 * Bit 0: instructions named N3, "backported" to esa-mode
692 * Bit 2: z/Architecture mode is active
693 * Bit 7: the store-facility-list-extended facility is installed
694 * Bit 17: the message-security assist is installed
695 * Bit 19: the long-displacement facility is installed
696 * Bit 21: the extended-immediate facility is installed
697 * Bit 22: extended-translation facility 3 is installed
698 * Bit 30: extended-translation facility 3 enhancement facility
699 * These get translated to:
700 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
701 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
702 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
703 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
705 for (i = 0; i < 6; i++)
706 if (facility_list & (1UL << (31 - stfl_bits[i])))
707 elf_hwcap |= 1UL << i;
709 if ((facility_list & (1UL << (31 - 22)))
710 && (facility_list & (1UL << (31 - 30))))
711 elf_hwcap |= 1UL << 8;
714 * Check for additional facilities with store-facility-list-extended.
715 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
716 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
717 * as stored by stfl, bits 32-xxx contain additional facilities.
718 * How many facility words are stored depends on the number of
719 * doublewords passed to the instruction. The additional facilites
721 * Bit 42: decimal floating point facility is installed
722 * Bit 44: perform floating point operation facility is installed
724 * HWCAP_S390_DFP bit 6 (42 && 44).
726 if ((elf_hwcap & (1UL << 2)) &&
727 __stfle(&facility_list_extended, 1) > 0) {
728 if ((facility_list_extended & (1ULL << (63 - 42)))
729 && (facility_list_extended & (1ULL << (63 - 44))))
730 elf_hwcap |= 1UL << 6;
733 if (MACHINE_HAS_HPAGE)
734 elf_hwcap |= 1UL << 7;
736 switch (S390_lowcore.cpu_id.machine) {
738 #if !defined(CONFIG_64BIT)
739 default: /* Use "g5" as default for 31 bit kernels. */
741 strcpy(elf_platform, "g5");
745 #if defined(CONFIG_64BIT)
746 default: /* Use "z900" as default for 64 bit kernels. */
748 strcpy(elf_platform, "z900");
752 strcpy(elf_platform, "z990");
756 strcpy(elf_platform, "z9-109");
760 strcpy(elf_platform, "z10");
766 * Setup function called from init/main.c just after the banner
771 setup_arch(char **cmdline_p)
773 /* set up preferred console */
774 add_preferred_console("ttyS", 0, NULL);
777 * print what head.S has found out about the machine
781 pr_info("Linux is running as a z/VM "
782 "guest operating system in 31-bit mode\n");
784 pr_info("Linux is running natively in 31-bit mode\n");
785 if (MACHINE_HAS_IEEE)
786 pr_info("The hardware system has IEEE compatible "
787 "floating point units\n");
789 pr_info("The hardware system has no IEEE compatible "
790 "floating point units\n");
791 #else /* CONFIG_64BIT */
793 pr_info("Linux is running as a z/VM "
794 "guest operating system in 64-bit mode\n");
795 else if (MACHINE_IS_KVM) {
796 pr_info("Linux is running under KVM in 64-bit mode\n");
797 add_preferred_console("hvc", 0, NULL);
798 s390_virtio_console_init();
800 pr_info("Linux is running natively in 64-bit mode\n");
801 #endif /* CONFIG_64BIT */
803 /* Have one command line that is parsed and saved in /proc/cmdline */
804 /* boot_command_line has been already set up in early.c */
805 *cmdline_p = boot_command_line;
807 ROOT_DEV = Root_RAM0;
809 init_mm.start_code = PAGE_OFFSET;
810 init_mm.end_code = (unsigned long) &_etext;
811 init_mm.end_data = (unsigned long) &_edata;
812 init_mm.brk = (unsigned long) &_end;
814 if (MACHINE_HAS_MVCOS)
815 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
817 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
823 setup_addressing_mode();
829 __cpu_logical_map[0] = stap();
830 s390_init_cpu_topology();
833 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
838 * Create kernel page tables and switch to virtual addressing.
842 /* Setup default console */
845 /* Setup zfcpdump support */
846 setup_zfcpdump(console_devno);