2 * arch/s390/kernel/setup.c
5 * Copyright (C) IBM Corp. 1999,2010
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/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>
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];
90 int __initdata memory_end_set;
91 unsigned long __initdata memory_end;
93 /* An array with a pointer to the lowcore of every CPU. */
94 struct _lowcore *lowcore_ptr[NR_CPUS];
95 EXPORT_SYMBOL(lowcore_ptr);
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 ...
103 #include <asm/setup.h>
106 * condev= and conmode= setup parameter.
109 static int __init condev_setup(char *str)
113 vdev = simple_strtoul(str, &str, 0);
114 if (vdev >= 0 && vdev < 65536) {
115 console_devno = vdev;
121 __setup("condev=", condev_setup);
123 static void __init set_preferred_console(void)
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);
133 static int __init conmode_setup(char *str)
135 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
136 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
139 #if defined(CONFIG_TN3215_CONSOLE)
140 if (strncmp(str, "3215", 5) == 0)
143 #if defined(CONFIG_TN3270_CONSOLE)
144 if (strncmp(str, "3270", 5) == 0)
147 set_preferred_console();
151 __setup("conmode=", conmode_setup);
153 static void __init conmode_default(void)
155 char query_buffer[1024];
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");
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).
172 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
174 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
179 if (strncmp(ptr + 8, "3270", 4) == 0) {
180 #if defined(CONFIG_TN3270_CONSOLE)
182 #elif defined(CONFIG_TN3215_CONSOLE)
184 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
187 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
188 #if defined(CONFIG_TN3215_CONSOLE)
190 #elif defined(CONFIG_TN3270_CONSOLE)
192 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
197 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203 #ifdef CONFIG_ZFCPDUMP
204 static void __init setup_zfcpdump(unsigned int console_devno)
208 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
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);
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;
220 static inline void setup_zfcpdump(unsigned int console_devno) {}
221 #endif /* CONFIG_ZFCPDUMP */
224 * Reboot, halt and power_off stubs. They just call _machine_restart,
225 * _machine_halt or _machine_power_off.
228 void machine_restart(char *command)
230 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
232 * Only unblank the console if we are called in enabled
233 * context or a bust_spinlocks cleared the way for us.
236 _machine_restart(command);
239 void machine_halt(void)
241 if (!in_interrupt() || oops_in_progress)
243 * Only unblank the console if we are called in enabled
244 * context or a bust_spinlocks cleared the way for us.
250 void machine_power_off(void)
252 if (!in_interrupt() || 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_power_off();
262 * Dummy power off function.
264 void (*pm_power_off)(void) = machine_power_off;
266 static int __init early_parse_mem(char *p)
268 memory_end = memparse(p, &p);
272 early_param("mem", early_parse_mem);
274 unsigned int user_mode = HOME_SPACE_MODE;
275 EXPORT_SYMBOL_GPL(user_mode);
277 static int set_amode_and_uaccess(unsigned long user_amode,
278 unsigned long user32_amode)
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;
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 |
291 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
292 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
294 if (MACHINE_HAS_MVCOS) {
295 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
298 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
304 * Switch kernel/user addressing modes?
306 static int __init early_parse_switch_amode(char *p)
308 user_mode = PRIMARY_SPACE_MODE;
311 early_param("switch_amode", early_parse_switch_amode);
313 static int __init early_parse_user_mode(char *p)
315 if (p && strcmp(p, "primary") == 0)
316 user_mode = PRIMARY_SPACE_MODE;
317 else if (!p || strcmp(p, "home") == 0)
318 user_mode = HOME_SPACE_MODE;
323 early_param("user_mode", early_parse_user_mode);
325 static void setup_addressing_mode(void)
327 if (user_mode == PRIMARY_SPACE_MODE) {
328 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
329 pr_info("Address spaces switched, "
330 "mvcos available\n");
332 pr_info("Address spaces switched, "
333 "mvcos not available\n");
343 * Setup lowcore for boot cpu
345 BUILD_BUG_ON(sizeof(struct _lowcore) != LC_PAGES * 4096);
346 lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
347 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
348 lc->restart_psw.addr =
349 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
350 if (user_mode != HOME_SPACE_MODE)
351 lc->restart_psw.mask |= PSW_ASC_HOME;
352 lc->external_new_psw.mask = psw_kernel_bits;
353 lc->external_new_psw.addr =
354 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
355 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
356 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
357 lc->program_new_psw.mask = psw_kernel_bits;
358 lc->program_new_psw.addr =
359 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
360 lc->mcck_new_psw.mask =
361 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
362 lc->mcck_new_psw.addr =
363 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
364 lc->io_new_psw.mask = psw_kernel_bits;
365 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
366 lc->clock_comparator = -1ULL;
367 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
368 lc->async_stack = (unsigned long)
369 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
370 lc->panic_stack = (unsigned long)
371 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
372 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
373 lc->thread_info = (unsigned long) &init_thread_union;
374 lc->machine_flags = S390_lowcore.machine_flags;
375 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
376 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
379 if (MACHINE_HAS_IEEE) {
380 lc->extended_save_area_addr = (__u32)
381 __alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
382 /* enable extended save area */
383 __ctl_set_bit(14, 29);
387 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
389 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
390 lc->async_enter_timer = S390_lowcore.async_enter_timer;
391 lc->exit_timer = S390_lowcore.exit_timer;
392 lc->user_timer = S390_lowcore.user_timer;
393 lc->system_timer = S390_lowcore.system_timer;
394 lc->steal_timer = S390_lowcore.steal_timer;
395 lc->last_update_timer = S390_lowcore.last_update_timer;
396 lc->last_update_clock = S390_lowcore.last_update_clock;
397 lc->ftrace_func = S390_lowcore.ftrace_func;
398 set_prefix((u32)(unsigned long) lc);
402 static struct resource code_resource = {
403 .name = "Kernel code",
404 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
407 static struct resource data_resource = {
408 .name = "Kernel data",
409 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
412 static struct resource bss_resource = {
413 .name = "Kernel bss",
414 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
417 static struct resource __initdata *standard_resources[] = {
423 static void __init setup_resources(void)
425 struct resource *res, *std_res, *sub_res;
428 code_resource.start = (unsigned long) &_text;
429 code_resource.end = (unsigned long) &_etext - 1;
430 data_resource.start = (unsigned long) &_etext;
431 data_resource.end = (unsigned long) &_edata - 1;
432 bss_resource.start = (unsigned long) &__bss_start;
433 bss_resource.end = (unsigned long) &__bss_stop - 1;
435 for (i = 0; i < MEMORY_CHUNKS; i++) {
436 if (!memory_chunk[i].size)
438 res = alloc_bootmem_low(sizeof(*res));
439 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
440 switch (memory_chunk[i].type) {
441 case CHUNK_READ_WRITE:
442 res->name = "System RAM";
444 case CHUNK_READ_ONLY:
445 res->name = "System ROM";
446 res->flags |= IORESOURCE_READONLY;
449 res->name = "reserved";
451 res->start = memory_chunk[i].addr;
452 res->end = res->start + memory_chunk[i].size - 1;
453 request_resource(&iomem_resource, res);
455 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
456 std_res = standard_resources[j];
457 if (std_res->start < res->start ||
458 std_res->start > res->end)
460 if (std_res->end > res->end) {
461 sub_res = alloc_bootmem_low(sizeof(*sub_res));
463 sub_res->end = res->end;
464 std_res->start = res->end + 1;
465 request_resource(res, sub_res);
467 request_resource(res, std_res);
473 unsigned long real_memory_size;
474 EXPORT_SYMBOL_GPL(real_memory_size);
476 static void __init setup_memory_end(void)
478 unsigned long memory_size;
479 unsigned long max_mem;
482 #ifdef CONFIG_ZFCPDUMP
483 if (ipl_info.type == IPL_TYPE_FCP_DUMP) {
484 memory_end = ZFCPDUMP_HSA_SIZE;
489 memory_end &= PAGE_MASK;
491 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
492 memory_end = min(max_mem, memory_end);
495 * Make sure all chunks are MAX_ORDER aligned so we don't need the
496 * extra checks that HOLES_IN_ZONE would require.
498 for (i = 0; i < MEMORY_CHUNKS; i++) {
499 unsigned long start, end;
500 struct mem_chunk *chunk;
503 chunk = &memory_chunk[i];
504 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
505 start = (chunk->addr + align - 1) & ~(align - 1);
506 end = (chunk->addr + chunk->size) & ~(align - 1);
508 memset(chunk, 0, sizeof(*chunk));
511 chunk->size = end - start;
515 for (i = 0; i < MEMORY_CHUNKS; i++) {
516 struct mem_chunk *chunk = &memory_chunk[i];
518 real_memory_size = max(real_memory_size,
519 chunk->addr + chunk->size);
520 if (chunk->addr >= max_mem) {
521 memset(chunk, 0, sizeof(*chunk));
524 if (chunk->addr + chunk->size > max_mem)
525 chunk->size = max_mem - chunk->addr;
526 memory_size = max(memory_size, chunk->addr + chunk->size);
529 memory_end = memory_size;
535 unsigned long bootmap_size;
536 unsigned long start_pfn, end_pfn;
540 * partially used pages are not usable - thus
541 * we are rounding upwards:
543 start_pfn = PFN_UP(__pa(&_end));
544 end_pfn = max_pfn = PFN_DOWN(memory_end);
546 #ifdef CONFIG_BLK_DEV_INITRD
548 * Move the initrd in case the bitmap of the bootmem allocater
549 * would overwrite it.
552 if (INITRD_START && INITRD_SIZE) {
553 unsigned long bmap_size;
556 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
557 bmap_size = PFN_PHYS(bmap_size);
559 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
560 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
562 if (start + INITRD_SIZE > memory_end) {
563 pr_err("initrd extends beyond end of "
564 "memory (0x%08lx > 0x%08lx) "
565 "disabling initrd\n",
566 start + INITRD_SIZE, memory_end);
567 INITRD_START = INITRD_SIZE = 0;
569 pr_info("Moving initrd (0x%08lx -> "
570 "0x%08lx, size: %ld)\n",
571 INITRD_START, start, INITRD_SIZE);
572 memmove((void *) start, (void *) INITRD_START,
574 INITRD_START = start;
581 * Initialize the boot-time allocator
583 bootmap_size = init_bootmem(start_pfn, end_pfn);
586 * Register RAM areas with the bootmem allocator.
589 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
590 unsigned long start_chunk, end_chunk, pfn;
592 if (memory_chunk[i].type != CHUNK_READ_WRITE)
594 start_chunk = PFN_DOWN(memory_chunk[i].addr);
595 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
596 end_chunk = min(end_chunk, end_pfn);
597 if (start_chunk >= end_chunk)
599 add_active_range(0, start_chunk, end_chunk);
600 pfn = max(start_chunk, start_pfn);
601 for (; pfn < end_chunk; pfn++)
602 page_set_storage_key(PFN_PHYS(pfn),
603 PAGE_DEFAULT_KEY, 0);
606 psw_set_key(PAGE_DEFAULT_KEY);
608 free_bootmem_with_active_regions(0, max_pfn);
611 * Reserve memory used for lowcore/command line/kernel image.
613 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
614 reserve_bootmem((unsigned long)_stext,
615 PFN_PHYS(start_pfn) - (unsigned long)_stext,
618 * Reserve the bootmem bitmap itself as well. We do this in two
619 * steps (first step was init_bootmem()) because this catches
620 * the (very unlikely) case of us accidentally initializing the
621 * bootmem allocator with an invalid RAM area.
623 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
626 #ifdef CONFIG_BLK_DEV_INITRD
627 if (INITRD_START && INITRD_SIZE) {
628 if (INITRD_START + INITRD_SIZE <= memory_end) {
629 reserve_bootmem(INITRD_START, INITRD_SIZE,
631 initrd_start = INITRD_START;
632 initrd_end = initrd_start + INITRD_SIZE;
634 pr_err("initrd extends beyond end of "
635 "memory (0x%08lx > 0x%08lx) "
636 "disabling initrd\n",
637 initrd_start + INITRD_SIZE, memory_end);
638 initrd_start = initrd_end = 0;
645 * Setup hardware capabilities.
647 static void __init setup_hwcaps(void)
649 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
654 * The store facility list bits numbers as found in the principles
655 * of operation are numbered with bit 1UL<<31 as number 0 to
656 * bit 1UL<<0 as number 31.
657 * Bit 0: instructions named N3, "backported" to esa-mode
658 * Bit 2: z/Architecture mode is active
659 * Bit 7: the store-facility-list-extended facility is installed
660 * Bit 17: the message-security assist is installed
661 * Bit 19: the long-displacement facility is installed
662 * Bit 21: the extended-immediate facility is installed
663 * Bit 22: extended-translation facility 3 is installed
664 * Bit 30: extended-translation facility 3 enhancement facility
665 * These get translated to:
666 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
667 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
668 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
669 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
671 for (i = 0; i < 6; i++)
672 if (test_facility(stfl_bits[i]))
673 elf_hwcap |= 1UL << i;
675 if (test_facility(22) && test_facility(30))
676 elf_hwcap |= HWCAP_S390_ETF3EH;
679 * Check for additional facilities with store-facility-list-extended.
680 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
681 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
682 * as stored by stfl, bits 32-xxx contain additional facilities.
683 * How many facility words are stored depends on the number of
684 * doublewords passed to the instruction. The additional facilities
686 * Bit 42: decimal floating point facility is installed
687 * Bit 44: perform floating point operation facility is installed
689 * HWCAP_S390_DFP bit 6 (42 && 44).
691 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
692 elf_hwcap |= HWCAP_S390_DFP;
695 * Huge page support HWCAP_S390_HPAGE is bit 7.
697 if (MACHINE_HAS_HPAGE)
698 elf_hwcap |= HWCAP_S390_HPAGE;
701 * 64-bit register support for 31-bit processes
702 * HWCAP_S390_HIGH_GPRS is bit 9.
704 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
707 switch (cpu_id.machine) {
709 #if !defined(CONFIG_64BIT)
710 default: /* Use "g5" as default for 31 bit kernels. */
712 strcpy(elf_platform, "g5");
716 #if defined(CONFIG_64BIT)
717 default: /* Use "z900" as default for 64 bit kernels. */
719 strcpy(elf_platform, "z900");
723 strcpy(elf_platform, "z990");
727 strcpy(elf_platform, "z9-109");
731 strcpy(elf_platform, "z10");
734 strcpy(elf_platform, "z196");
740 * Setup function called from init/main.c just after the banner
745 setup_arch(char **cmdline_p)
748 * print what head.S has found out about the machine
752 pr_info("Linux is running as a z/VM "
753 "guest operating system in 31-bit mode\n");
754 else if (MACHINE_IS_LPAR)
755 pr_info("Linux is running natively in 31-bit mode\n");
756 if (MACHINE_HAS_IEEE)
757 pr_info("The hardware system has IEEE compatible "
758 "floating point units\n");
760 pr_info("The hardware system has no IEEE compatible "
761 "floating point units\n");
762 #else /* CONFIG_64BIT */
764 pr_info("Linux is running as a z/VM "
765 "guest operating system in 64-bit mode\n");
766 else if (MACHINE_IS_KVM)
767 pr_info("Linux is running under KVM in 64-bit mode\n");
768 else if (MACHINE_IS_LPAR)
769 pr_info("Linux is running natively in 64-bit mode\n");
770 #endif /* CONFIG_64BIT */
772 /* Have one command line that is parsed and saved in /proc/cmdline */
773 /* boot_command_line has been already set up in early.c */
774 *cmdline_p = boot_command_line;
776 ROOT_DEV = Root_RAM0;
778 init_mm.start_code = PAGE_OFFSET;
779 init_mm.end_code = (unsigned long) &_etext;
780 init_mm.end_data = (unsigned long) &_edata;
781 init_mm.brk = (unsigned long) &_end;
783 if (MACHINE_HAS_MVCOS)
784 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
786 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
792 setup_addressing_mode();
798 s390_init_cpu_topology();
801 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
806 * Create kernel page tables and switch to virtual addressing.
810 /* Setup default console */
812 set_preferred_console();
814 /* Setup zfcpdump support */
815 setup_zfcpdump(console_devno);