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 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
22 #include <linux/stddef.h>
23 #include <linux/unistd.h>
24 #include <linux/ptrace.h>
25 #include <linux/slab.h>
26 #include <linux/user.h>
27 #include <linux/a.out.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/seq_file.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>
45 #include <asm/uaccess.h>
46 #include <asm/system.h>
48 #include <asm/mmu_context.h>
49 #include <asm/cpcmd.h>
50 #include <asm/lowcore.h>
53 #include <asm/ptrace.h>
54 #include <asm/sections.h>
55 #include <asm/ebcdic.h>
56 #include <asm/compat.h>
58 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
59 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
60 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
61 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
62 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
65 * User copy operations.
67 struct uaccess_ops uaccess;
68 EXPORT_SYMBOL(uaccess);
73 unsigned int console_mode = 0;
74 unsigned int console_devno = -1;
75 unsigned int console_irq = -1;
76 unsigned long machine_flags = 0;
77 unsigned long elf_hwcap = 0;
78 char elf_platform[ELF_PLATFORM_SIZE];
80 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
81 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
82 static unsigned long __initdata memory_end;
85 * This is set up by the setup-routine at boot-time
86 * for S390 need to find out, what we have to setup
87 * using address 0x10400 ...
90 #include <asm/setup.h>
92 static struct resource code_resource = {
93 .name = "Kernel code",
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
97 static struct resource data_resource = {
98 .name = "Kernel data",
99 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
103 * cpu_init() initializes state that is per-CPU.
105 void __cpuinit cpu_init(void)
107 int addr = hard_smp_processor_id();
110 * Store processor id in lowcore (used e.g. in timer_interrupt)
112 get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
113 S390_lowcore.cpu_data.cpu_addr = addr;
116 * Force FPU initialization:
118 clear_thread_flag(TIF_USEDFPU);
121 atomic_inc(&init_mm.mm_count);
122 current->active_mm = &init_mm;
125 enter_lazy_tlb(&init_mm, current);
129 * VM halt and poweroff setup routines
131 char vmhalt_cmd[128] = "";
132 char vmpoff_cmd[128] = "";
133 static char vmpanic_cmd[128] = "";
135 static void strncpy_skip_quote(char *dst, char *src, int n)
140 for (sx = 0; src[sx] != 0; sx++) {
141 if (src[sx] == '"') continue;
147 static int __init vmhalt_setup(char *str)
149 strncpy_skip_quote(vmhalt_cmd, str, 127);
154 __setup("vmhalt=", vmhalt_setup);
156 static int __init vmpoff_setup(char *str)
158 strncpy_skip_quote(vmpoff_cmd, str, 127);
163 __setup("vmpoff=", vmpoff_setup);
165 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
168 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
169 cpcmd(vmpanic_cmd, NULL, 0, NULL);
174 #define PANIC_PRI_VMPANIC 0
176 static struct notifier_block vmpanic_nb = {
177 .notifier_call = vmpanic_notify,
178 .priority = PANIC_PRI_VMPANIC
181 static int __init vmpanic_setup(char *str)
183 static int register_done __initdata = 0;
185 strncpy_skip_quote(vmpanic_cmd, str, 127);
186 vmpanic_cmd[127] = 0;
187 if (!register_done) {
189 atomic_notifier_chain_register(&panic_notifier_list,
195 __setup("vmpanic=", vmpanic_setup);
198 * condev= and conmode= setup parameter.
201 static int __init condev_setup(char *str)
205 vdev = simple_strtoul(str, &str, 0);
206 if (vdev >= 0 && vdev < 65536) {
207 console_devno = vdev;
213 __setup("condev=", condev_setup);
215 static int __init conmode_setup(char *str)
217 #if defined(CONFIG_SCLP_CONSOLE)
218 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
221 #if defined(CONFIG_TN3215_CONSOLE)
222 if (strncmp(str, "3215", 5) == 0)
225 #if defined(CONFIG_TN3270_CONSOLE)
226 if (strncmp(str, "3270", 5) == 0)
232 __setup("conmode=", conmode_setup);
234 static void __init conmode_default(void)
236 char query_buffer[1024];
240 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
241 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
242 ptr = strstr(query_buffer, "SUBCHANNEL =");
243 console_irq = simple_strtoul(ptr + 13, NULL, 16);
244 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
245 ptr = strstr(query_buffer, "CONMODE");
247 * Set the conmode to 3215 so that the device recognition
248 * will set the cu_type of the console to 3215. If the
249 * conmode is 3270 and we don't set it back then both
250 * 3215 and the 3270 driver will try to access the console
251 * device (3215 as console and 3270 as normal tty).
253 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
255 #if defined(CONFIG_SCLP_CONSOLE)
260 if (strncmp(ptr + 8, "3270", 4) == 0) {
261 #if defined(CONFIG_TN3270_CONSOLE)
263 #elif defined(CONFIG_TN3215_CONSOLE)
265 #elif defined(CONFIG_SCLP_CONSOLE)
268 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
269 #if defined(CONFIG_TN3215_CONSOLE)
271 #elif defined(CONFIG_TN3270_CONSOLE)
273 #elif defined(CONFIG_SCLP_CONSOLE)
277 } else if (MACHINE_IS_P390) {
278 #if defined(CONFIG_TN3215_CONSOLE)
280 #elif defined(CONFIG_TN3270_CONSOLE)
284 #if defined(CONFIG_SCLP_CONSOLE)
290 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
291 static void __init setup_zfcpdump(unsigned int console_devno)
295 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
297 if (console_devno != -1)
298 sprintf(str, "cio_ignore=all,!0.0.%04x,!0.0.%04x",
299 ipl_info.data.fcp.dev_id.devno, console_devno);
301 sprintf(str, "cio_ignore=all,!0.0.%04x",
302 ipl_info.data.fcp.dev_id.devno);
303 strcat(COMMAND_LINE, " ");
304 strcat(COMMAND_LINE, str);
305 console_loglevel = 2;
308 static inline void setup_zfcpdump(unsigned int console_devno) {}
309 #endif /* CONFIG_ZFCPDUMP */
312 void (*_machine_restart)(char *command) = machine_restart_smp;
313 void (*_machine_halt)(void) = machine_halt_smp;
314 void (*_machine_power_off)(void) = machine_power_off_smp;
317 * Reboot, halt and power_off routines for non SMP.
319 static void do_machine_restart_nonsmp(char * __unused)
324 static void do_machine_halt_nonsmp(void)
326 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
327 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
328 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
331 static void do_machine_power_off_nonsmp(void)
333 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
334 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
335 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
338 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
339 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
340 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
344 * Reboot, halt and power_off stubs. They just call _machine_restart,
345 * _machine_halt or _machine_power_off.
348 void machine_restart(char *command)
350 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
352 * Only unblank the console if we are called in enabled
353 * context or a bust_spinlocks cleared the way for us.
356 _machine_restart(command);
359 void machine_halt(void)
361 if (!in_interrupt() || oops_in_progress)
363 * Only unblank the console if we are called in enabled
364 * context or a bust_spinlocks cleared the way for us.
370 void machine_power_off(void)
372 if (!in_interrupt() || oops_in_progress)
374 * Only unblank the console if we are called in enabled
375 * context or a bust_spinlocks cleared the way for us.
378 _machine_power_off();
382 * Dummy power off function.
384 void (*pm_power_off)(void) = machine_power_off;
386 static int __init early_parse_mem(char *p)
388 memory_end = memparse(p, &p);
391 early_param("mem", early_parse_mem);
394 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
396 static int __init early_parse_ipldelay(char *p)
398 unsigned long delay = 0;
400 delay = simple_strtoul(p, &p, 0);
409 delay *= 60 * 1000000;
412 /* now wait for the requested amount of time */
417 early_param("ipldelay", early_parse_ipldelay);
419 #ifdef CONFIG_S390_SWITCH_AMODE
420 unsigned int switch_amode = 0;
421 EXPORT_SYMBOL_GPL(switch_amode);
423 static void set_amode_and_uaccess(unsigned long user_amode,
424 unsigned long user32_amode)
426 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
427 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
428 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
430 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
431 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
432 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
433 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
434 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
437 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
438 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
440 if (MACHINE_HAS_MVCOS) {
441 printk("mvcos available.\n");
442 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
444 printk("mvcos not available.\n");
445 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
450 * Switch kernel/user addressing modes?
452 static int __init early_parse_switch_amode(char *p)
457 early_param("switch_amode", early_parse_switch_amode);
459 #else /* CONFIG_S390_SWITCH_AMODE */
460 static inline void set_amode_and_uaccess(unsigned long user_amode,
461 unsigned long user32_amode)
464 #endif /* CONFIG_S390_SWITCH_AMODE */
466 #ifdef CONFIG_S390_EXEC_PROTECT
467 unsigned int s390_noexec = 0;
468 EXPORT_SYMBOL_GPL(s390_noexec);
471 * Enable execute protection?
473 static int __init early_parse_noexec(char *p)
475 if (!strncmp(p, "off", 3))
481 early_param("noexec", early_parse_noexec);
482 #endif /* CONFIG_S390_EXEC_PROTECT */
484 static void setup_addressing_mode(void)
487 printk("S390 execute protection active, ");
488 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
492 printk("S390 address spaces switched, ");
493 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
495 #ifdef CONFIG_TRACE_IRQFLAGS
496 sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
497 io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
508 * Setup lowcore for boot cpu
510 lc_pages = sizeof(void *) == 8 ? 2 : 1;
511 lc = (struct _lowcore *)
512 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
513 memset(lc, 0, lc_pages * PAGE_SIZE);
514 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
515 lc->restart_psw.addr =
516 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
518 lc->restart_psw.mask |= PSW_ASC_HOME;
519 lc->external_new_psw.mask = psw_kernel_bits;
520 lc->external_new_psw.addr =
521 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
522 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
523 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
524 lc->program_new_psw.mask = psw_kernel_bits;
525 lc->program_new_psw.addr =
526 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
527 lc->mcck_new_psw.mask =
528 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
529 lc->mcck_new_psw.addr =
530 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
531 lc->io_new_psw.mask = psw_kernel_bits;
532 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
533 lc->ipl_device = S390_lowcore.ipl_device;
534 lc->jiffy_timer = -1LL;
535 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
536 lc->async_stack = (unsigned long)
537 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
538 lc->panic_stack = (unsigned long)
539 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
540 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
541 lc->thread_info = (unsigned long) &init_thread_union;
543 if (MACHINE_HAS_IEEE) {
544 lc->extended_save_area_addr = (__u32)
545 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
546 /* enable extended save area */
547 __ctl_set_bit(14, 29);
550 set_prefix((u32)(unsigned long) lc);
554 setup_resources(void)
556 struct resource *res, *sub_res;
559 code_resource.start = (unsigned long) &_text;
560 code_resource.end = (unsigned long) &_etext - 1;
561 data_resource.start = (unsigned long) &_etext;
562 data_resource.end = (unsigned long) &_edata - 1;
564 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
565 res = alloc_bootmem_low(sizeof(struct resource));
566 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
567 switch (memory_chunk[i].type) {
568 case CHUNK_READ_WRITE:
569 res->name = "System RAM";
571 case CHUNK_READ_ONLY:
572 res->name = "System ROM";
573 res->flags |= IORESOURCE_READONLY;
576 res->name = "reserved";
578 res->start = memory_chunk[i].addr;
579 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
580 request_resource(&iomem_resource, res);
582 if (code_resource.start >= res->start &&
583 code_resource.start <= res->end &&
584 code_resource.end > res->end) {
585 sub_res = alloc_bootmem_low(sizeof(struct resource));
586 memcpy(sub_res, &code_resource,
587 sizeof(struct resource));
588 sub_res->end = res->end;
589 code_resource.start = res->end + 1;
590 request_resource(res, sub_res);
593 if (code_resource.start >= res->start &&
594 code_resource.start <= res->end &&
595 code_resource.end <= res->end)
596 request_resource(res, &code_resource);
598 if (data_resource.start >= res->start &&
599 data_resource.start <= res->end &&
600 data_resource.end > res->end) {
601 sub_res = alloc_bootmem_low(sizeof(struct resource));
602 memcpy(sub_res, &data_resource,
603 sizeof(struct resource));
604 sub_res->end = res->end;
605 data_resource.start = res->end + 1;
606 request_resource(res, sub_res);
609 if (data_resource.start >= res->start &&
610 data_resource.start <= res->end &&
611 data_resource.end <= res->end)
612 request_resource(res, &data_resource);
616 unsigned long real_memory_size;
617 EXPORT_SYMBOL_GPL(real_memory_size);
619 static void __init setup_memory_end(void)
621 unsigned long memory_size;
622 unsigned long max_mem, max_phys;
625 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
626 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
627 memory_end = ZFCPDUMP_HSA_SIZE;
630 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
631 memory_end &= PAGE_MASK;
633 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
635 for (i = 0; i < MEMORY_CHUNKS; i++) {
636 struct mem_chunk *chunk = &memory_chunk[i];
638 real_memory_size = max(real_memory_size,
639 chunk->addr + chunk->size);
640 if (chunk->addr >= max_mem) {
641 memset(chunk, 0, sizeof(*chunk));
644 if (chunk->addr + chunk->size > max_mem)
645 chunk->size = max_mem - chunk->addr;
646 memory_size = max(memory_size, chunk->addr + chunk->size);
649 memory_end = memory_size;
655 unsigned long bootmap_size;
656 unsigned long start_pfn, end_pfn;
660 * partially used pages are not usable - thus
661 * we are rounding upwards:
663 start_pfn = PFN_UP(__pa(&_end));
664 end_pfn = max_pfn = PFN_DOWN(memory_end);
666 #ifdef CONFIG_BLK_DEV_INITRD
668 * Move the initrd in case the bitmap of the bootmem allocater
669 * would overwrite it.
672 if (INITRD_START && INITRD_SIZE) {
673 unsigned long bmap_size;
676 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
677 bmap_size = PFN_PHYS(bmap_size);
679 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
680 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
682 if (start + INITRD_SIZE > memory_end) {
683 printk("initrd extends beyond end of memory "
684 "(0x%08lx > 0x%08lx)\n"
685 "disabling initrd\n",
686 start + INITRD_SIZE, memory_end);
687 INITRD_START = INITRD_SIZE = 0;
689 printk("Moving initrd (0x%08lx -> 0x%08lx, "
691 INITRD_START, start, INITRD_SIZE);
692 memmove((void *) start, (void *) INITRD_START,
694 INITRD_START = start;
701 * Initialize the boot-time allocator
703 bootmap_size = init_bootmem(start_pfn, end_pfn);
706 * Register RAM areas with the bootmem allocator.
709 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
710 unsigned long start_chunk, end_chunk, pfn;
712 if (memory_chunk[i].type != CHUNK_READ_WRITE)
714 start_chunk = PFN_DOWN(memory_chunk[i].addr);
715 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
716 end_chunk = min(end_chunk, end_pfn);
717 if (start_chunk >= end_chunk)
719 add_active_range(0, start_chunk, end_chunk);
720 pfn = max(start_chunk, start_pfn);
721 for (; pfn <= end_chunk; pfn++)
722 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
725 psw_set_key(PAGE_DEFAULT_KEY);
727 free_bootmem_with_active_regions(0, max_pfn);
730 * Reserve memory used for lowcore/command line/kernel image.
732 reserve_bootmem(0, (unsigned long)_ehead);
733 reserve_bootmem((unsigned long)_stext,
734 PFN_PHYS(start_pfn) - (unsigned long)_stext);
736 * Reserve the bootmem bitmap itself as well. We do this in two
737 * steps (first step was init_bootmem()) because this catches
738 * the (very unlikely) case of us accidentally initializing the
739 * bootmem allocator with an invalid RAM area.
741 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
743 #ifdef CONFIG_BLK_DEV_INITRD
744 if (INITRD_START && INITRD_SIZE) {
745 if (INITRD_START + INITRD_SIZE <= memory_end) {
746 reserve_bootmem(INITRD_START, INITRD_SIZE);
747 initrd_start = INITRD_START;
748 initrd_end = initrd_start + INITRD_SIZE;
750 printk("initrd extends beyond end of memory "
751 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
752 initrd_start + INITRD_SIZE, memory_end);
753 initrd_start = initrd_end = 0;
759 static __init unsigned int stfl(void)
762 " .insn s,0xb2b10000,0(0)\n" /* stfl */
765 return S390_lowcore.stfl_fac_list;
768 static __init int stfle(unsigned long long *list, int doublewords)
770 typedef struct { unsigned long long _[doublewords]; } addrtype;
771 register unsigned long __nr asm("0") = doublewords - 1;
773 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
774 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
779 * Setup hardware capabilities.
781 static void __init setup_hwcaps(void)
783 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
784 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
785 unsigned long long facility_list_extended;
786 unsigned int facility_list;
789 facility_list = stfl();
791 * The store facility list bits numbers as found in the principles
792 * of operation are numbered with bit 1UL<<31 as number 0 to
793 * bit 1UL<<0 as number 31.
794 * Bit 0: instructions named N3, "backported" to esa-mode
795 * Bit 2: z/Architecture mode is active
796 * Bit 7: the store-facility-list-extended facility is installed
797 * Bit 17: the message-security assist is installed
798 * Bit 19: the long-displacement facility is installed
799 * Bit 21: the extended-immediate facility is installed
800 * These get translated to:
801 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
802 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
803 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
805 for (i = 0; i < 6; i++)
806 if (facility_list & (1UL << (31 - stfl_bits[i])))
807 elf_hwcap |= 1UL << i;
810 * Check for additional facilities with store-facility-list-extended.
811 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
812 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
813 * as stored by stfl, bits 32-xxx contain additional facilities.
814 * How many facility words are stored depends on the number of
815 * doublewords passed to the instruction. The additional facilites
817 * Bit 43: decimal floating point facility is installed
819 * HWCAP_S390_DFP bit 6.
821 if ((elf_hwcap & (1UL << 2)) &&
822 stfle(&facility_list_extended, 1) > 0) {
823 if (facility_list_extended & (1ULL << (64 - 43)))
824 elf_hwcap |= 1UL << 6;
827 switch (cpuinfo->cpu_id.machine) {
829 #if !defined(CONFIG_64BIT)
830 default: /* Use "g5" as default for 31 bit kernels. */
832 strcpy(elf_platform, "g5");
836 #if defined(CONFIG_64BIT)
837 default: /* Use "z900" as default for 64 bit kernels. */
839 strcpy(elf_platform, "z900");
843 strcpy(elf_platform, "z990");
846 strcpy(elf_platform, "z9-109");
852 * Setup function called from init/main.c just after the banner
857 setup_arch(char **cmdline_p)
860 * print what head.S has found out about the machine
863 printk((MACHINE_IS_VM) ?
864 "We are running under VM (31 bit mode)\n" :
865 "We are running native (31 bit mode)\n");
866 printk((MACHINE_HAS_IEEE) ?
867 "This machine has an IEEE fpu\n" :
868 "This machine has no IEEE fpu\n");
869 #else /* CONFIG_64BIT */
870 printk((MACHINE_IS_VM) ?
871 "We are running under VM (64 bit mode)\n" :
872 "We are running native (64 bit mode)\n");
873 #endif /* CONFIG_64BIT */
875 /* Save unparsed command line copy for /proc/cmdline */
876 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
878 *cmdline_p = COMMAND_LINE;
879 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
881 ROOT_DEV = Root_RAM0;
883 init_mm.start_code = PAGE_OFFSET;
884 init_mm.end_code = (unsigned long) &_etext;
885 init_mm.end_data = (unsigned long) &_edata;
886 init_mm.brk = (unsigned long) &_end;
888 if (MACHINE_HAS_MVCOS)
889 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
891 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
897 setup_addressing_mode();
903 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
904 smp_setup_cpu_possible_map();
907 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
912 * Create kernel page tables and switch to virtual addressing.
916 /* Setup default console */
919 /* Setup zfcpdump support */
920 setup_zfcpdump(console_devno);
923 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
929 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
934 cpuinfo->cpu_id.version,
935 cpuinfo->cpu_id.ident,
936 cpuinfo->cpu_id.machine,
937 cpuinfo->cpu_id.unused);
941 * show_cpuinfo - Get information on one CPU for use by procfs.
944 static int show_cpuinfo(struct seq_file *m, void *v)
946 static const char *hwcap_str[7] = {
947 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
949 struct cpuinfo_S390 *cpuinfo;
950 unsigned long n = (unsigned long) v - 1;
953 s390_adjust_jiffies();
956 seq_printf(m, "vendor_id : IBM/S390\n"
957 "# processors : %i\n"
958 "bogomips per cpu: %lu.%02lu\n",
959 num_online_cpus(), loops_per_jiffy/(500000/HZ),
960 (loops_per_jiffy/(5000/HZ))%100);
961 seq_puts(m, "features\t: ");
962 for (i = 0; i < 7; i++)
963 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
964 seq_printf(m, "%s ", hwcap_str[i]);
970 if (smp_processor_id() == n)
971 cpuinfo = &S390_lowcore.cpu_data;
973 cpuinfo = &lowcore_ptr[n]->cpu_data;
975 cpuinfo = &S390_lowcore.cpu_data;
977 seq_printf(m, "processor %li: "
979 "identification = %06X, "
981 n, cpuinfo->cpu_id.version,
982 cpuinfo->cpu_id.ident,
983 cpuinfo->cpu_id.machine);
989 static void *c_start(struct seq_file *m, loff_t *pos)
991 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
993 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
996 return c_start(m, pos);
998 static void c_stop(struct seq_file *m, void *v)
1001 struct seq_operations cpuinfo_op = {
1005 .show = show_cpuinfo,