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/seq_file.h>
39 #include <linux/kernel_stat.h>
40 #include <linux/device.h>
41 #include <linux/notifier.h>
42 #include <linux/pfn.h>
43 #include <linux/ctype.h>
44 #include <linux/reboot.h>
45 #include <linux/topology.h>
48 #include <asm/uaccess.h>
49 #include <asm/system.h>
51 #include <asm/mmu_context.h>
52 #include <asm/cpcmd.h>
53 #include <asm/lowcore.h>
56 #include <asm/ptrace.h>
57 #include <asm/sections.h>
58 #include <asm/ebcdic.h>
59 #include <asm/compat.h>
60 #include <asm/kvm_virtio.h>
62 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
63 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
64 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
65 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
66 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
69 * User copy operations.
71 struct uaccess_ops uaccess;
72 EXPORT_SYMBOL(uaccess);
77 unsigned int console_mode = 0;
78 unsigned int console_devno = -1;
79 unsigned int console_irq = -1;
80 unsigned long machine_flags;
81 unsigned long elf_hwcap = 0;
82 char elf_platform[ELF_PLATFORM_SIZE];
84 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
85 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
86 static unsigned long __initdata memory_end;
89 * This is set up by the setup-routine at boot-time
90 * for S390 need to find out, what we have to setup
91 * using address 0x10400 ...
94 #include <asm/setup.h>
96 static struct resource code_resource = {
97 .name = "Kernel code",
98 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
101 static struct resource data_resource = {
102 .name = "Kernel data",
103 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
107 * cpu_init() initializes state that is per-CPU.
109 void __cpuinit cpu_init(void)
111 int addr = hard_smp_processor_id();
114 * Store processor id in lowcore (used e.g. in timer_interrupt)
116 get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
117 S390_lowcore.cpu_data.cpu_addr = addr;
120 * Force FPU initialization:
122 clear_thread_flag(TIF_USEDFPU);
125 atomic_inc(&init_mm.mm_count);
126 current->active_mm = &init_mm;
129 enter_lazy_tlb(&init_mm, current);
133 * condev= and conmode= setup parameter.
136 static int __init condev_setup(char *str)
140 vdev = simple_strtoul(str, &str, 0);
141 if (vdev >= 0 && vdev < 65536) {
142 console_devno = vdev;
148 __setup("condev=", condev_setup);
150 static int __init conmode_setup(char *str)
152 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
153 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
156 #if defined(CONFIG_TN3215_CONSOLE)
157 if (strncmp(str, "3215", 5) == 0)
160 #if defined(CONFIG_TN3270_CONSOLE)
161 if (strncmp(str, "3270", 5) == 0)
167 __setup("conmode=", conmode_setup);
169 static void __init conmode_default(void)
171 char query_buffer[1024];
175 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
176 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
177 ptr = strstr(query_buffer, "SUBCHANNEL =");
178 console_irq = simple_strtoul(ptr + 13, NULL, 16);
179 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
180 ptr = strstr(query_buffer, "CONMODE");
182 * Set the conmode to 3215 so that the device recognition
183 * will set the cu_type of the console to 3215. If the
184 * conmode is 3270 and we don't set it back then both
185 * 3215 and the 3270 driver will try to access the console
186 * device (3215 as console and 3270 as normal tty).
188 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
190 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
195 if (strncmp(ptr + 8, "3270", 4) == 0) {
196 #if defined(CONFIG_TN3270_CONSOLE)
198 #elif defined(CONFIG_TN3215_CONSOLE)
200 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
203 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
204 #if defined(CONFIG_TN3215_CONSOLE)
206 #elif defined(CONFIG_TN3270_CONSOLE)
208 #elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
213 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
219 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
220 static void __init setup_zfcpdump(unsigned int console_devno)
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
226 if (console_devno != -1)
227 sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
228 ipl_info.data.fcp.dev_id.devno, console_devno);
230 sprintf(str, " cio_ignore=all,!0.0.%04x",
231 ipl_info.data.fcp.dev_id.devno);
232 strcat(boot_command_line, str);
233 console_loglevel = 2;
236 static inline void setup_zfcpdump(unsigned int console_devno) {}
237 #endif /* CONFIG_ZFCPDUMP */
240 * Reboot, halt and power_off stubs. They just call _machine_restart,
241 * _machine_halt or _machine_power_off.
244 void machine_restart(char *command)
246 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
248 * Only unblank the console if we are called in enabled
249 * context or a bust_spinlocks cleared the way for us.
252 _machine_restart(command);
255 void machine_halt(void)
257 if (!in_interrupt() || oops_in_progress)
259 * Only unblank the console if we are called in enabled
260 * context or a bust_spinlocks cleared the way for us.
266 void machine_power_off(void)
268 if (!in_interrupt() || oops_in_progress)
270 * Only unblank the console if we are called in enabled
271 * context or a bust_spinlocks cleared the way for us.
274 _machine_power_off();
278 * Dummy power off function.
280 void (*pm_power_off)(void) = machine_power_off;
282 static int __init early_parse_mem(char *p)
284 memory_end = memparse(p, &p);
287 early_param("mem", early_parse_mem);
289 #ifdef CONFIG_S390_SWITCH_AMODE
291 unsigned int switch_amode = 1;
293 unsigned int switch_amode = 0;
295 EXPORT_SYMBOL_GPL(switch_amode);
297 static int set_amode_and_uaccess(unsigned long user_amode,
298 unsigned long user32_amode)
300 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
301 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
302 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
304 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
305 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
306 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
307 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
308 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
311 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
312 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
314 if (MACHINE_HAS_MVCOS) {
315 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
318 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
324 * Switch kernel/user addressing modes?
326 static int __init early_parse_switch_amode(char *p)
331 early_param("switch_amode", early_parse_switch_amode);
333 #else /* CONFIG_S390_SWITCH_AMODE */
334 static inline int set_amode_and_uaccess(unsigned long user_amode,
335 unsigned long user32_amode)
339 #endif /* CONFIG_S390_SWITCH_AMODE */
341 #ifdef CONFIG_S390_EXEC_PROTECT
342 unsigned int s390_noexec = 0;
343 EXPORT_SYMBOL_GPL(s390_noexec);
346 * Enable execute protection?
348 static int __init early_parse_noexec(char *p)
350 if (!strncmp(p, "off", 3))
356 early_param("noexec", early_parse_noexec);
357 #endif /* CONFIG_S390_EXEC_PROTECT */
359 static void setup_addressing_mode(void)
362 if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
363 PSW32_ASC_SECONDARY))
364 pr_info("Execute protection active, "
365 "mvcos available\n");
367 pr_info("Execute protection active, "
368 "mvcos not available\n");
369 } else if (switch_amode) {
370 if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
371 pr_info("Address spaces switched, "
372 "mvcos available\n");
374 pr_info("Address spaces switched, "
375 "mvcos not available\n");
377 #ifdef CONFIG_TRACE_IRQFLAGS
378 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
379 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
390 * Setup lowcore for boot cpu
392 lc_pages = sizeof(void *) == 8 ? 2 : 1;
393 lc = (struct _lowcore *)
394 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
395 memset(lc, 0, lc_pages * PAGE_SIZE);
396 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
397 lc->restart_psw.addr =
398 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
400 lc->restart_psw.mask |= PSW_ASC_HOME;
401 lc->external_new_psw.mask = psw_kernel_bits;
402 lc->external_new_psw.addr =
403 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
404 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
405 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
406 lc->program_new_psw.mask = psw_kernel_bits;
407 lc->program_new_psw.addr =
408 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
409 lc->mcck_new_psw.mask =
410 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
411 lc->mcck_new_psw.addr =
412 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
413 lc->io_new_psw.mask = psw_kernel_bits;
414 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
415 lc->ipl_device = S390_lowcore.ipl_device;
416 lc->clock_comparator = -1ULL;
417 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
418 lc->async_stack = (unsigned long)
419 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
420 lc->panic_stack = (unsigned long)
421 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
422 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
423 lc->thread_info = (unsigned long) &init_thread_union;
425 if (MACHINE_HAS_IEEE) {
426 lc->extended_save_area_addr = (__u32)
427 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
428 /* enable extended save area */
429 __ctl_set_bit(14, 29);
432 set_prefix((u32)(unsigned long) lc);
436 setup_resources(void)
438 struct resource *res, *sub_res;
441 code_resource.start = (unsigned long) &_text;
442 code_resource.end = (unsigned long) &_etext - 1;
443 data_resource.start = (unsigned long) &_etext;
444 data_resource.end = (unsigned long) &_edata - 1;
446 for (i = 0; i < MEMORY_CHUNKS; i++) {
447 if (!memory_chunk[i].size)
449 res = alloc_bootmem_low(sizeof(struct resource));
450 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
451 switch (memory_chunk[i].type) {
452 case CHUNK_READ_WRITE:
453 res->name = "System RAM";
455 case CHUNK_READ_ONLY:
456 res->name = "System ROM";
457 res->flags |= IORESOURCE_READONLY;
460 res->name = "reserved";
462 res->start = memory_chunk[i].addr;
463 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
464 request_resource(&iomem_resource, res);
466 if (code_resource.start >= res->start &&
467 code_resource.start <= res->end &&
468 code_resource.end > res->end) {
469 sub_res = alloc_bootmem_low(sizeof(struct resource));
470 memcpy(sub_res, &code_resource,
471 sizeof(struct resource));
472 sub_res->end = res->end;
473 code_resource.start = res->end + 1;
474 request_resource(res, sub_res);
477 if (code_resource.start >= res->start &&
478 code_resource.start <= res->end &&
479 code_resource.end <= res->end)
480 request_resource(res, &code_resource);
482 if (data_resource.start >= res->start &&
483 data_resource.start <= res->end &&
484 data_resource.end > res->end) {
485 sub_res = alloc_bootmem_low(sizeof(struct resource));
486 memcpy(sub_res, &data_resource,
487 sizeof(struct resource));
488 sub_res->end = res->end;
489 data_resource.start = res->end + 1;
490 request_resource(res, sub_res);
493 if (data_resource.start >= res->start &&
494 data_resource.start <= res->end &&
495 data_resource.end <= res->end)
496 request_resource(res, &data_resource);
500 unsigned long real_memory_size;
501 EXPORT_SYMBOL_GPL(real_memory_size);
503 static void __init setup_memory_end(void)
505 unsigned long memory_size;
506 unsigned long max_mem;
509 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
510 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
511 memory_end = ZFCPDUMP_HSA_SIZE;
514 memory_end &= PAGE_MASK;
516 max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
517 memory_end = min(max_mem, memory_end);
520 * Make sure all chunks are MAX_ORDER aligned so we don't need the
521 * extra checks that HOLES_IN_ZONE would require.
523 for (i = 0; i < MEMORY_CHUNKS; i++) {
524 unsigned long start, end;
525 struct mem_chunk *chunk;
528 chunk = &memory_chunk[i];
529 align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
530 start = (chunk->addr + align - 1) & ~(align - 1);
531 end = (chunk->addr + chunk->size) & ~(align - 1);
533 memset(chunk, 0, sizeof(*chunk));
536 chunk->size = end - start;
540 for (i = 0; i < MEMORY_CHUNKS; i++) {
541 struct mem_chunk *chunk = &memory_chunk[i];
543 real_memory_size = max(real_memory_size,
544 chunk->addr + chunk->size);
545 if (chunk->addr >= max_mem) {
546 memset(chunk, 0, sizeof(*chunk));
549 if (chunk->addr + chunk->size > max_mem)
550 chunk->size = max_mem - chunk->addr;
551 memory_size = max(memory_size, chunk->addr + chunk->size);
554 memory_end = memory_size;
560 unsigned long bootmap_size;
561 unsigned long start_pfn, end_pfn;
565 * partially used pages are not usable - thus
566 * we are rounding upwards:
568 start_pfn = PFN_UP(__pa(&_end));
569 end_pfn = max_pfn = PFN_DOWN(memory_end);
571 #ifdef CONFIG_BLK_DEV_INITRD
573 * Move the initrd in case the bitmap of the bootmem allocater
574 * would overwrite it.
577 if (INITRD_START && INITRD_SIZE) {
578 unsigned long bmap_size;
581 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
582 bmap_size = PFN_PHYS(bmap_size);
584 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
585 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
587 if (start + INITRD_SIZE > memory_end) {
588 pr_err("initrd extends beyond end of "
589 "memory (0x%08lx > 0x%08lx) "
590 "disabling initrd\n",
591 start + INITRD_SIZE, memory_end);
592 INITRD_START = INITRD_SIZE = 0;
594 pr_info("Moving initrd (0x%08lx -> "
595 "0x%08lx, size: %ld)\n",
596 INITRD_START, start, INITRD_SIZE);
597 memmove((void *) start, (void *) INITRD_START,
599 INITRD_START = start;
606 * Initialize the boot-time allocator
608 bootmap_size = init_bootmem(start_pfn, end_pfn);
611 * Register RAM areas with the bootmem allocator.
614 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
615 unsigned long start_chunk, end_chunk, pfn;
617 if (memory_chunk[i].type != CHUNK_READ_WRITE)
619 start_chunk = PFN_DOWN(memory_chunk[i].addr);
620 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
621 end_chunk = min(end_chunk, end_pfn);
622 if (start_chunk >= end_chunk)
624 add_active_range(0, start_chunk, end_chunk);
625 pfn = max(start_chunk, start_pfn);
626 for (; pfn < end_chunk; pfn++)
627 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
630 psw_set_key(PAGE_DEFAULT_KEY);
632 free_bootmem_with_active_regions(0, max_pfn);
635 * Reserve memory used for lowcore/command line/kernel image.
637 reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
638 reserve_bootmem((unsigned long)_stext,
639 PFN_PHYS(start_pfn) - (unsigned long)_stext,
642 * Reserve the bootmem bitmap itself as well. We do this in two
643 * steps (first step was init_bootmem()) because this catches
644 * the (very unlikely) case of us accidentally initializing the
645 * bootmem allocator with an invalid RAM area.
647 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
650 #ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START && INITRD_SIZE) {
652 if (INITRD_START + INITRD_SIZE <= memory_end) {
653 reserve_bootmem(INITRD_START, INITRD_SIZE,
655 initrd_start = INITRD_START;
656 initrd_end = initrd_start + INITRD_SIZE;
658 pr_err("initrd extends beyond end of "
659 "memory (0x%08lx > 0x%08lx) "
660 "disabling initrd\n",
661 initrd_start + INITRD_SIZE, memory_end);
662 initrd_start = initrd_end = 0;
669 * Setup hardware capabilities.
671 static void __init setup_hwcaps(void)
673 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
674 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
675 unsigned long long facility_list_extended;
676 unsigned int facility_list;
679 facility_list = stfl();
681 * The store facility list bits numbers as found in the principles
682 * of operation are numbered with bit 1UL<<31 as number 0 to
683 * bit 1UL<<0 as number 31.
684 * Bit 0: instructions named N3, "backported" to esa-mode
685 * Bit 2: z/Architecture mode is active
686 * Bit 7: the store-facility-list-extended facility is installed
687 * Bit 17: the message-security assist is installed
688 * Bit 19: the long-displacement facility is installed
689 * Bit 21: the extended-immediate facility is installed
690 * These get translated to:
691 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
692 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
693 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
695 for (i = 0; i < 6; i++)
696 if (facility_list & (1UL << (31 - stfl_bits[i])))
697 elf_hwcap |= 1UL << i;
700 * Check for additional facilities with store-facility-list-extended.
701 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
702 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
703 * as stored by stfl, bits 32-xxx contain additional facilities.
704 * How many facility words are stored depends on the number of
705 * doublewords passed to the instruction. The additional facilites
707 * Bit 43: decimal floating point facility is installed
709 * HWCAP_S390_DFP bit 6.
711 if ((elf_hwcap & (1UL << 2)) &&
712 __stfle(&facility_list_extended, 1) > 0) {
713 if (facility_list_extended & (1ULL << (64 - 43)))
714 elf_hwcap |= 1UL << 6;
717 if (MACHINE_HAS_HPAGE)
718 elf_hwcap |= 1UL << 7;
720 switch (cpuinfo->cpu_id.machine) {
722 #if !defined(CONFIG_64BIT)
723 default: /* Use "g5" as default for 31 bit kernels. */
725 strcpy(elf_platform, "g5");
729 #if defined(CONFIG_64BIT)
730 default: /* Use "z900" as default for 64 bit kernels. */
732 strcpy(elf_platform, "z900");
736 strcpy(elf_platform, "z990");
740 strcpy(elf_platform, "z9-109");
744 strcpy(elf_platform, "z10");
750 * Setup function called from init/main.c just after the banner
755 setup_arch(char **cmdline_p)
757 /* set up preferred console */
758 add_preferred_console("ttyS", 0, NULL);
761 * print what head.S has found out about the machine
765 pr_info("Linux is running as a z/VM "
766 "guest operating system in 31-bit mode\n");
768 pr_info("Linux is running natively in 31-bit mode\n");
769 if (MACHINE_HAS_IEEE)
770 pr_info("The hardware system has IEEE compatible "
771 "floating point units\n");
773 pr_info("The hardware system has no IEEE compatible "
774 "floating point units\n");
775 #else /* CONFIG_64BIT */
777 pr_info("Linux is running as a z/VM "
778 "guest operating system in 64-bit mode\n");
779 else if (MACHINE_IS_KVM) {
780 pr_info("Linux is running under KVM in 64-bit mode\n");
781 add_preferred_console("hvc", 0, NULL);
782 s390_virtio_console_init();
784 pr_info("Linux is running natively in 64-bit mode\n");
785 #endif /* CONFIG_64BIT */
787 /* Have one command line that is parsed and saved in /proc/cmdline */
788 /* boot_command_line has been already set up in early.c */
789 *cmdline_p = boot_command_line;
791 ROOT_DEV = Root_RAM0;
793 init_mm.start_code = PAGE_OFFSET;
794 init_mm.end_code = (unsigned long) &_etext;
795 init_mm.end_data = (unsigned long) &_edata;
796 init_mm.brk = (unsigned long) &_end;
798 if (MACHINE_HAS_MVCOS)
799 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
801 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
807 setup_addressing_mode();
813 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
814 s390_init_cpu_topology();
817 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
822 * Create kernel page tables and switch to virtual addressing.
826 /* Setup default console */
829 /* Setup zfcpdump support */
830 setup_zfcpdump(console_devno);
833 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
835 printk(KERN_INFO "cpu %d "
839 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
844 cpuinfo->cpu_id.version,
845 cpuinfo->cpu_id.ident,
846 cpuinfo->cpu_id.machine,
847 cpuinfo->cpu_id.unused);
851 * show_cpuinfo - Get information on one CPU for use by procfs.
854 static int show_cpuinfo(struct seq_file *m, void *v)
856 static const char *hwcap_str[8] = {
857 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
860 struct cpuinfo_S390 *cpuinfo;
861 unsigned long n = (unsigned long) v - 1;
864 s390_adjust_jiffies();
867 seq_printf(m, "vendor_id : IBM/S390\n"
868 "# processors : %i\n"
869 "bogomips per cpu: %lu.%02lu\n",
870 num_online_cpus(), loops_per_jiffy/(500000/HZ),
871 (loops_per_jiffy/(5000/HZ))%100);
872 seq_puts(m, "features\t: ");
873 for (i = 0; i < 8; i++)
874 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
875 seq_printf(m, "%s ", hwcap_str[i]);
881 if (smp_processor_id() == n)
882 cpuinfo = &S390_lowcore.cpu_data;
884 cpuinfo = &lowcore_ptr[n]->cpu_data;
886 cpuinfo = &S390_lowcore.cpu_data;
888 seq_printf(m, "processor %li: "
890 "identification = %06X, "
892 n, cpuinfo->cpu_id.version,
893 cpuinfo->cpu_id.ident,
894 cpuinfo->cpu_id.machine);
900 static void *c_start(struct seq_file *m, loff_t *pos)
902 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
904 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
907 return c_start(m, pos);
909 static void c_stop(struct seq_file *m, void *v)
912 const struct seq_operations cpuinfo_op = {
916 .show = show_cpuinfo,