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, str);
304 console_loglevel = 2;
307 static inline void setup_zfcpdump(unsigned int console_devno) {}
308 #endif /* CONFIG_ZFCPDUMP */
311 void (*_machine_restart)(char *command) = machine_restart_smp;
312 void (*_machine_halt)(void) = machine_halt_smp;
313 void (*_machine_power_off)(void) = machine_power_off_smp;
316 * Reboot, halt and power_off routines for non SMP.
318 static void do_machine_restart_nonsmp(char * __unused)
323 static void do_machine_halt_nonsmp(void)
325 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
326 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
327 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
330 static void do_machine_power_off_nonsmp(void)
332 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
333 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
334 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
337 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
338 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
339 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
343 * Reboot, halt and power_off stubs. They just call _machine_restart,
344 * _machine_halt or _machine_power_off.
347 void machine_restart(char *command)
349 if (!in_interrupt() || oops_in_progress)
351 * Only unblank the console if we are called in enabled
352 * context or a bust_spinlocks cleared the way for us.
355 _machine_restart(command);
358 void machine_halt(void)
360 if (!in_interrupt() || oops_in_progress)
362 * Only unblank the console if we are called in enabled
363 * context or a bust_spinlocks cleared the way for us.
369 void machine_power_off(void)
371 if (!in_interrupt() || oops_in_progress)
373 * Only unblank the console if we are called in enabled
374 * context or a bust_spinlocks cleared the way for us.
377 _machine_power_off();
381 * Dummy power off function.
383 void (*pm_power_off)(void) = machine_power_off;
385 static int __init early_parse_mem(char *p)
387 memory_end = memparse(p, &p);
390 early_param("mem", early_parse_mem);
393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
395 static int __init early_parse_ipldelay(char *p)
397 unsigned long delay = 0;
399 delay = simple_strtoul(p, &p, 0);
408 delay *= 60 * 1000000;
411 /* now wait for the requested amount of time */
416 early_param("ipldelay", early_parse_ipldelay);
418 #ifdef CONFIG_S390_SWITCH_AMODE
419 unsigned int switch_amode = 0;
420 EXPORT_SYMBOL_GPL(switch_amode);
422 static void set_amode_and_uaccess(unsigned long user_amode,
423 unsigned long user32_amode)
425 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
426 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
427 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
429 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
430 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
431 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
432 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
433 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
436 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
437 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
439 if (MACHINE_HAS_MVCOS) {
440 printk("mvcos available.\n");
441 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
443 printk("mvcos not available.\n");
444 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
449 * Switch kernel/user addressing modes?
451 static int __init early_parse_switch_amode(char *p)
456 early_param("switch_amode", early_parse_switch_amode);
458 #else /* CONFIG_S390_SWITCH_AMODE */
459 static inline void set_amode_and_uaccess(unsigned long user_amode,
460 unsigned long user32_amode)
463 #endif /* CONFIG_S390_SWITCH_AMODE */
465 #ifdef CONFIG_S390_EXEC_PROTECT
466 unsigned int s390_noexec = 0;
467 EXPORT_SYMBOL_GPL(s390_noexec);
470 * Enable execute protection?
472 static int __init early_parse_noexec(char *p)
474 if (!strncmp(p, "off", 3))
480 early_param("noexec", early_parse_noexec);
481 #endif /* CONFIG_S390_EXEC_PROTECT */
483 static void setup_addressing_mode(void)
486 printk("S390 execute protection active, ");
487 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
491 printk("S390 address spaces switched, ");
492 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
503 * Setup lowcore for boot cpu
505 lc_pages = sizeof(void *) == 8 ? 2 : 1;
506 lc = (struct _lowcore *)
507 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
508 memset(lc, 0, lc_pages * PAGE_SIZE);
509 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
510 lc->restart_psw.addr =
511 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
513 lc->restart_psw.mask |= PSW_ASC_HOME;
514 lc->external_new_psw.mask = psw_kernel_bits;
515 lc->external_new_psw.addr =
516 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
517 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
518 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
519 lc->program_new_psw.mask = psw_kernel_bits;
520 lc->program_new_psw.addr =
521 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
522 lc->mcck_new_psw.mask =
523 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
524 lc->mcck_new_psw.addr =
525 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
526 lc->io_new_psw.mask = psw_kernel_bits;
527 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
528 lc->ipl_device = S390_lowcore.ipl_device;
529 lc->jiffy_timer = -1LL;
530 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
531 lc->async_stack = (unsigned long)
532 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
533 lc->panic_stack = (unsigned long)
534 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
535 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
536 lc->thread_info = (unsigned long) &init_thread_union;
538 if (MACHINE_HAS_IEEE) {
539 lc->extended_save_area_addr = (__u32)
540 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
541 /* enable extended save area */
542 __ctl_set_bit(14, 29);
545 set_prefix((u32)(unsigned long) lc);
549 setup_resources(void)
551 struct resource *res, *sub_res;
554 code_resource.start = (unsigned long) &_text;
555 code_resource.end = (unsigned long) &_etext - 1;
556 data_resource.start = (unsigned long) &_etext;
557 data_resource.end = (unsigned long) &_edata - 1;
559 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
560 res = alloc_bootmem_low(sizeof(struct resource));
561 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
562 switch (memory_chunk[i].type) {
563 case CHUNK_READ_WRITE:
564 res->name = "System RAM";
566 case CHUNK_READ_ONLY:
567 res->name = "System ROM";
568 res->flags |= IORESOURCE_READONLY;
571 res->name = "reserved";
573 res->start = memory_chunk[i].addr;
574 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
575 request_resource(&iomem_resource, res);
577 if (code_resource.start >= res->start &&
578 code_resource.start <= res->end &&
579 code_resource.end > res->end) {
580 sub_res = alloc_bootmem_low(sizeof(struct resource));
581 memcpy(sub_res, &code_resource,
582 sizeof(struct resource));
583 sub_res->end = res->end;
584 code_resource.start = res->end + 1;
585 request_resource(res, sub_res);
588 if (code_resource.start >= res->start &&
589 code_resource.start <= res->end &&
590 code_resource.end <= res->end)
591 request_resource(res, &code_resource);
593 if (data_resource.start >= res->start &&
594 data_resource.start <= res->end &&
595 data_resource.end > res->end) {
596 sub_res = alloc_bootmem_low(sizeof(struct resource));
597 memcpy(sub_res, &data_resource,
598 sizeof(struct resource));
599 sub_res->end = res->end;
600 data_resource.start = res->end + 1;
601 request_resource(res, sub_res);
604 if (data_resource.start >= res->start &&
605 data_resource.start <= res->end &&
606 data_resource.end <= res->end)
607 request_resource(res, &data_resource);
611 unsigned long real_memory_size;
612 EXPORT_SYMBOL_GPL(real_memory_size);
614 static void __init setup_memory_end(void)
616 unsigned long memory_size;
617 unsigned long max_mem, max_phys;
620 #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
621 if (ipl_info.type == IPL_TYPE_FCP_DUMP)
622 memory_end = ZFCPDUMP_HSA_SIZE;
625 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
626 memory_end &= PAGE_MASK;
628 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
630 for (i = 0; i < MEMORY_CHUNKS; i++) {
631 struct mem_chunk *chunk = &memory_chunk[i];
633 real_memory_size = max(real_memory_size,
634 chunk->addr + chunk->size);
635 if (chunk->addr >= max_mem) {
636 memset(chunk, 0, sizeof(*chunk));
639 if (chunk->addr + chunk->size > max_mem)
640 chunk->size = max_mem - chunk->addr;
641 memory_size = max(memory_size, chunk->addr + chunk->size);
644 memory_end = memory_size;
650 unsigned long bootmap_size;
651 unsigned long start_pfn, end_pfn;
655 * partially used pages are not usable - thus
656 * we are rounding upwards:
658 start_pfn = PFN_UP(__pa(&_end));
659 end_pfn = max_pfn = PFN_DOWN(memory_end);
661 #ifdef CONFIG_BLK_DEV_INITRD
663 * Move the initrd in case the bitmap of the bootmem allocater
664 * would overwrite it.
667 if (INITRD_START && INITRD_SIZE) {
668 unsigned long bmap_size;
671 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
672 bmap_size = PFN_PHYS(bmap_size);
674 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
675 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
677 if (start + INITRD_SIZE > memory_end) {
678 printk("initrd extends beyond end of memory "
679 "(0x%08lx > 0x%08lx)\n"
680 "disabling initrd\n",
681 start + INITRD_SIZE, memory_end);
682 INITRD_START = INITRD_SIZE = 0;
684 printk("Moving initrd (0x%08lx -> 0x%08lx, "
686 INITRD_START, start, INITRD_SIZE);
687 memmove((void *) start, (void *) INITRD_START,
689 INITRD_START = start;
696 * Initialize the boot-time allocator
698 bootmap_size = init_bootmem(start_pfn, end_pfn);
701 * Register RAM areas with the bootmem allocator.
704 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
705 unsigned long start_chunk, end_chunk, pfn;
707 if (memory_chunk[i].type != CHUNK_READ_WRITE)
709 start_chunk = PFN_DOWN(memory_chunk[i].addr);
710 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
711 end_chunk = min(end_chunk, end_pfn);
712 if (start_chunk >= end_chunk)
714 add_active_range(0, start_chunk, end_chunk);
715 pfn = max(start_chunk, start_pfn);
716 for (; pfn <= end_chunk; pfn++)
717 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
720 psw_set_key(PAGE_DEFAULT_KEY);
722 free_bootmem_with_active_regions(0, max_pfn);
725 * Reserve memory used for lowcore/command line/kernel image.
727 reserve_bootmem(0, (unsigned long)_ehead);
728 reserve_bootmem((unsigned long)_stext,
729 PFN_PHYS(start_pfn) - (unsigned long)_stext);
731 * Reserve the bootmem bitmap itself as well. We do this in two
732 * steps (first step was init_bootmem()) because this catches
733 * the (very unlikely) case of us accidentally initializing the
734 * bootmem allocator with an invalid RAM area.
736 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
738 #ifdef CONFIG_BLK_DEV_INITRD
739 if (INITRD_START && INITRD_SIZE) {
740 if (INITRD_START + INITRD_SIZE <= memory_end) {
741 reserve_bootmem(INITRD_START, INITRD_SIZE);
742 initrd_start = INITRD_START;
743 initrd_end = initrd_start + INITRD_SIZE;
745 printk("initrd extends beyond end of memory "
746 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
747 initrd_start + INITRD_SIZE, memory_end);
748 initrd_start = initrd_end = 0;
754 static __init unsigned int stfl(void)
757 " .insn s,0xb2b10000,0(0)\n" /* stfl */
760 return S390_lowcore.stfl_fac_list;
763 static __init int stfle(unsigned long long *list, int doublewords)
765 typedef struct { unsigned long long _[doublewords]; } addrtype;
766 register unsigned long __nr asm("0") = doublewords - 1;
768 asm volatile(".insn s,0xb2b00000,%0" /* stfle */
769 : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
774 * Setup hardware capabilities.
776 static void __init setup_hwcaps(void)
778 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
779 struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
780 unsigned long long facility_list_extended;
781 unsigned int facility_list;
784 facility_list = stfl();
786 * The store facility list bits numbers as found in the principles
787 * of operation are numbered with bit 1UL<<31 as number 0 to
788 * bit 1UL<<0 as number 31.
789 * Bit 0: instructions named N3, "backported" to esa-mode
790 * Bit 2: z/Architecture mode is active
791 * Bit 7: the store-facility-list-extended facility is installed
792 * Bit 17: the message-security assist is installed
793 * Bit 19: the long-displacement facility is installed
794 * Bit 21: the extended-immediate facility is installed
795 * These get translated to:
796 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
797 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
798 * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
800 for (i = 0; i < 6; i++)
801 if (facility_list & (1UL << (31 - stfl_bits[i])))
802 elf_hwcap |= 1UL << i;
805 * Check for additional facilities with store-facility-list-extended.
806 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
807 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
808 * as stored by stfl, bits 32-xxx contain additional facilities.
809 * How many facility words are stored depends on the number of
810 * doublewords passed to the instruction. The additional facilites
812 * Bit 43: decimal floating point facility is installed
814 * HWCAP_S390_DFP bit 6.
816 if ((elf_hwcap & (1UL << 2)) &&
817 stfle(&facility_list_extended, 1) > 0) {
818 if (facility_list_extended & (1ULL << (64 - 43)))
819 elf_hwcap |= 1UL << 6;
822 switch (cpuinfo->cpu_id.machine) {
824 #if !defined(CONFIG_64BIT)
825 default: /* Use "g5" as default for 31 bit kernels. */
827 strcpy(elf_platform, "g5");
831 #if defined(CONFIG_64BIT)
832 default: /* Use "z900" as default for 64 bit kernels. */
834 strcpy(elf_platform, "z900");
838 strcpy(elf_platform, "z990");
841 strcpy(elf_platform, "z9-109");
847 * Setup function called from init/main.c just after the banner
852 setup_arch(char **cmdline_p)
855 * print what head.S has found out about the machine
858 printk((MACHINE_IS_VM) ?
859 "We are running under VM (31 bit mode)\n" :
860 "We are running native (31 bit mode)\n");
861 printk((MACHINE_HAS_IEEE) ?
862 "This machine has an IEEE fpu\n" :
863 "This machine has no IEEE fpu\n");
864 #else /* CONFIG_64BIT */
865 printk((MACHINE_IS_VM) ?
866 "We are running under VM (64 bit mode)\n" :
867 "We are running native (64 bit mode)\n");
868 #endif /* CONFIG_64BIT */
870 /* Save unparsed command line copy for /proc/cmdline */
871 strlcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
873 *cmdline_p = COMMAND_LINE;
874 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
876 ROOT_DEV = Root_RAM0;
878 init_mm.start_code = PAGE_OFFSET;
879 init_mm.end_code = (unsigned long) &_etext;
880 init_mm.end_data = (unsigned long) &_edata;
881 init_mm.brk = (unsigned long) &_end;
883 if (MACHINE_HAS_MVCOS)
884 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
886 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
892 setup_addressing_mode();
898 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
899 smp_setup_cpu_possible_map();
902 * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
907 * Create kernel page tables and switch to virtual addressing.
911 /* Setup default console */
914 /* Setup zfcpdump support */
915 setup_zfcpdump(console_devno);
918 void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
924 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
929 cpuinfo->cpu_id.version,
930 cpuinfo->cpu_id.ident,
931 cpuinfo->cpu_id.machine,
932 cpuinfo->cpu_id.unused);
936 * show_cpuinfo - Get information on one CPU for use by procfs.
939 static int show_cpuinfo(struct seq_file *m, void *v)
941 static const char *hwcap_str[7] = {
942 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
944 struct cpuinfo_S390 *cpuinfo;
945 unsigned long n = (unsigned long) v - 1;
948 s390_adjust_jiffies();
951 seq_printf(m, "vendor_id : IBM/S390\n"
952 "# processors : %i\n"
953 "bogomips per cpu: %lu.%02lu\n",
954 num_online_cpus(), loops_per_jiffy/(500000/HZ),
955 (loops_per_jiffy/(5000/HZ))%100);
956 seq_puts(m, "features\t: ");
957 for (i = 0; i < 7; i++)
958 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
959 seq_printf(m, "%s ", hwcap_str[i]);
965 if (smp_processor_id() == n)
966 cpuinfo = &S390_lowcore.cpu_data;
968 cpuinfo = &lowcore_ptr[n]->cpu_data;
970 cpuinfo = &S390_lowcore.cpu_data;
972 seq_printf(m, "processor %li: "
974 "identification = %06X, "
976 n, cpuinfo->cpu_id.version,
977 cpuinfo->cpu_id.ident,
978 cpuinfo->cpu_id.machine);
984 static void *c_start(struct seq_file *m, loff_t *pos)
986 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
988 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
991 return c_start(m, pos);
993 static void c_stop(struct seq_file *m, void *v)
996 struct seq_operations cpuinfo_op = {
1000 .show = show_cpuinfo,