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/reboot.h>
43 #include <asm/uaccess.h>
44 #include <asm/system.h>
46 #include <asm/mmu_context.h>
47 #include <asm/cpcmd.h>
48 #include <asm/lowcore.h>
51 #include <asm/ptrace.h>
52 #include <asm/sections.h>
53 #include <asm/compat.h>
55 long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
56 PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
57 long psw_user_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
58 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
59 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
62 * User copy operations.
64 struct uaccess_ops uaccess;
65 EXPORT_SYMBOL_GPL(uaccess);
70 unsigned int console_mode = 0;
71 unsigned int console_devno = -1;
72 unsigned int console_irq = -1;
73 unsigned long machine_flags = 0;
75 struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
76 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
77 static unsigned long __initdata memory_end;
80 * This is set up by the setup-routine at boot-time
81 * for S390 need to find out, what we have to setup
82 * using address 0x10400 ...
85 #include <asm/setup.h>
87 static struct resource code_resource = {
88 .name = "Kernel code",
89 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
92 static struct resource data_resource = {
93 .name = "Kernel data",
94 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
98 * cpu_init() initializes state that is per-CPU.
100 void __devinit cpu_init (void)
102 int addr = hard_smp_processor_id();
105 * Store processor id in lowcore (used e.g. in timer_interrupt)
107 asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
108 S390_lowcore.cpu_data.cpu_addr = addr;
111 * Force FPU initialization:
113 clear_thread_flag(TIF_USEDFPU);
116 atomic_inc(&init_mm.mm_count);
117 current->active_mm = &init_mm;
120 enter_lazy_tlb(&init_mm, current);
124 * VM halt and poweroff setup routines
126 char vmhalt_cmd[128] = "";
127 char vmpoff_cmd[128] = "";
128 static char vmpanic_cmd[128] = "";
130 static inline void strncpy_skip_quote(char *dst, char *src, int n)
135 for (sx = 0; src[sx] != 0; sx++) {
136 if (src[sx] == '"') continue;
142 static int __init vmhalt_setup(char *str)
144 strncpy_skip_quote(vmhalt_cmd, str, 127);
149 __setup("vmhalt=", vmhalt_setup);
151 static int __init vmpoff_setup(char *str)
153 strncpy_skip_quote(vmpoff_cmd, str, 127);
158 __setup("vmpoff=", vmpoff_setup);
160 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
163 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
164 cpcmd(vmpanic_cmd, NULL, 0, NULL);
169 #define PANIC_PRI_VMPANIC 0
171 static struct notifier_block vmpanic_nb = {
172 .notifier_call = vmpanic_notify,
173 .priority = PANIC_PRI_VMPANIC
176 static int __init vmpanic_setup(char *str)
178 static int register_done __initdata = 0;
180 strncpy_skip_quote(vmpanic_cmd, str, 127);
181 vmpanic_cmd[127] = 0;
182 if (!register_done) {
184 atomic_notifier_chain_register(&panic_notifier_list,
190 __setup("vmpanic=", vmpanic_setup);
193 * condev= and conmode= setup parameter.
196 static int __init condev_setup(char *str)
200 vdev = simple_strtoul(str, &str, 0);
201 if (vdev >= 0 && vdev < 65536) {
202 console_devno = vdev;
208 __setup("condev=", condev_setup);
210 static int __init conmode_setup(char *str)
212 #if defined(CONFIG_SCLP_CONSOLE)
213 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
216 #if defined(CONFIG_TN3215_CONSOLE)
217 if (strncmp(str, "3215", 5) == 0)
220 #if defined(CONFIG_TN3270_CONSOLE)
221 if (strncmp(str, "3270", 5) == 0)
227 __setup("conmode=", conmode_setup);
229 static void __init conmode_default(void)
231 char query_buffer[1024];
235 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
236 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
237 ptr = strstr(query_buffer, "SUBCHANNEL =");
238 console_irq = simple_strtoul(ptr + 13, NULL, 16);
239 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
240 ptr = strstr(query_buffer, "CONMODE");
242 * Set the conmode to 3215 so that the device recognition
243 * will set the cu_type of the console to 3215. If the
244 * conmode is 3270 and we don't set it back then both
245 * 3215 and the 3270 driver will try to access the console
246 * device (3215 as console and 3270 as normal tty).
248 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
250 #if defined(CONFIG_SCLP_CONSOLE)
255 if (strncmp(ptr + 8, "3270", 4) == 0) {
256 #if defined(CONFIG_TN3270_CONSOLE)
258 #elif defined(CONFIG_TN3215_CONSOLE)
260 #elif defined(CONFIG_SCLP_CONSOLE)
263 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
264 #if defined(CONFIG_TN3215_CONSOLE)
266 #elif defined(CONFIG_TN3270_CONSOLE)
268 #elif defined(CONFIG_SCLP_CONSOLE)
272 } else if (MACHINE_IS_P390) {
273 #if defined(CONFIG_TN3215_CONSOLE)
275 #elif defined(CONFIG_TN3270_CONSOLE)
279 #if defined(CONFIG_SCLP_CONSOLE)
286 void (*_machine_restart)(char *command) = machine_restart_smp;
287 void (*_machine_halt)(void) = machine_halt_smp;
288 void (*_machine_power_off)(void) = machine_power_off_smp;
291 * Reboot, halt and power_off routines for non SMP.
293 static void do_machine_restart_nonsmp(char * __unused)
298 static void do_machine_halt_nonsmp(void)
300 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
301 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
302 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
305 static void do_machine_power_off_nonsmp(void)
307 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
308 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
309 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
312 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
313 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
314 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
318 * Reboot, halt and power_off stubs. They just call _machine_restart,
319 * _machine_halt or _machine_power_off.
322 void machine_restart(char *command)
324 if (!in_interrupt() || oops_in_progress)
326 * Only unblank the console if we are called in enabled
327 * context or a bust_spinlocks cleared the way for us.
330 _machine_restart(command);
333 void machine_halt(void)
335 if (!in_interrupt() || oops_in_progress)
337 * Only unblank the console if we are called in enabled
338 * context or a bust_spinlocks cleared the way for us.
344 void machine_power_off(void)
346 if (!in_interrupt() || oops_in_progress)
348 * Only unblank the console if we are called in enabled
349 * context or a bust_spinlocks cleared the way for us.
352 _machine_power_off();
356 * Dummy power off function.
358 void (*pm_power_off)(void) = machine_power_off;
360 static int __init early_parse_mem(char *p)
362 memory_end = memparse(p, &p);
365 early_param("mem", early_parse_mem);
368 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
370 static int __init early_parse_ipldelay(char *p)
372 unsigned long delay = 0;
374 delay = simple_strtoul(p, &p, 0);
383 delay *= 60 * 1000000;
386 /* now wait for the requested amount of time */
391 early_param("ipldelay", early_parse_ipldelay);
393 #ifdef CONFIG_S390_SWITCH_AMODE
394 unsigned int switch_amode = 0;
395 EXPORT_SYMBOL_GPL(switch_amode);
397 static inline void set_amode_and_uaccess(unsigned long user_amode,
398 unsigned long user32_amode)
400 psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
401 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
402 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
404 psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
405 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
406 PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
407 psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
408 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
411 psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
412 PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
414 if (MACHINE_HAS_MVCOS) {
415 printk("mvcos available.\n");
416 memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
418 printk("mvcos not available.\n");
419 memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
424 * Switch kernel/user addressing modes?
426 static int __init early_parse_switch_amode(char *p)
431 early_param("switch_amode", early_parse_switch_amode);
433 #else /* CONFIG_S390_SWITCH_AMODE */
434 static inline void set_amode_and_uaccess(unsigned long user_amode,
435 unsigned long user32_amode)
438 #endif /* CONFIG_S390_SWITCH_AMODE */
440 #ifdef CONFIG_S390_EXEC_PROTECT
441 unsigned int s390_noexec = 0;
442 EXPORT_SYMBOL_GPL(s390_noexec);
445 * Enable execute protection?
447 static int __init early_parse_noexec(char *p)
449 if (!strncmp(p, "off", 3))
455 early_param("noexec", early_parse_noexec);
456 #endif /* CONFIG_S390_EXEC_PROTECT */
458 static void setup_addressing_mode(void)
461 printk("S390 execute protection active, ");
462 set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
466 printk("S390 address spaces switched, ");
467 set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
478 * Setup lowcore for boot cpu
480 lc_pages = sizeof(void *) == 8 ? 2 : 1;
481 lc = (struct _lowcore *)
482 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
483 memset(lc, 0, lc_pages * PAGE_SIZE);
484 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
485 lc->restart_psw.addr =
486 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
488 lc->restart_psw.mask |= PSW_ASC_HOME;
489 lc->external_new_psw.mask = psw_kernel_bits;
490 lc->external_new_psw.addr =
491 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
492 lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
493 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
494 lc->program_new_psw.mask = psw_kernel_bits;
495 lc->program_new_psw.addr =
496 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
497 lc->mcck_new_psw.mask =
498 psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
499 lc->mcck_new_psw.addr =
500 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
501 lc->io_new_psw.mask = psw_kernel_bits;
502 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
503 lc->ipl_device = S390_lowcore.ipl_device;
504 lc->jiffy_timer = -1LL;
505 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
506 lc->async_stack = (unsigned long)
507 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
508 lc->panic_stack = (unsigned long)
509 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
510 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
511 lc->thread_info = (unsigned long) &init_thread_union;
513 if (MACHINE_HAS_IEEE) {
514 lc->extended_save_area_addr = (__u32)
515 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
516 /* enable extended save area */
517 __ctl_set_bit(14, 29);
520 set_prefix((u32)(unsigned long) lc);
524 setup_resources(void)
526 struct resource *res;
529 code_resource.start = (unsigned long) &_text;
530 code_resource.end = (unsigned long) &_etext - 1;
531 data_resource.start = (unsigned long) &_etext;
532 data_resource.end = (unsigned long) &_edata - 1;
534 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
535 res = alloc_bootmem_low(sizeof(struct resource));
536 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
537 switch (memory_chunk[i].type) {
538 case CHUNK_READ_WRITE:
539 res->name = "System RAM";
541 case CHUNK_READ_ONLY:
542 res->name = "System ROM";
543 res->flags |= IORESOURCE_READONLY;
546 res->name = "reserved";
548 res->start = memory_chunk[i].addr;
549 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
550 request_resource(&iomem_resource, res);
551 request_resource(res, &code_resource);
552 request_resource(res, &data_resource);
556 static void __init setup_memory_end(void)
558 unsigned long real_size, memory_size;
559 unsigned long max_mem, max_phys;
562 memory_size = real_size = 0;
563 max_phys = VMALLOC_END_INIT - VMALLOC_MIN_SIZE;
564 memory_end &= PAGE_MASK;
566 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
568 for (i = 0; i < MEMORY_CHUNKS; i++) {
569 struct mem_chunk *chunk = &memory_chunk[i];
571 real_size = max(real_size, chunk->addr + chunk->size);
572 if (chunk->addr >= max_mem) {
573 memset(chunk, 0, sizeof(*chunk));
576 if (chunk->addr + chunk->size > max_mem)
577 chunk->size = max_mem - chunk->addr;
578 memory_size = max(memory_size, chunk->addr + chunk->size);
581 memory_end = memory_size;
587 unsigned long bootmap_size;
588 unsigned long start_pfn, end_pfn, init_pfn;
592 * partially used pages are not usable - thus
593 * we are rounding upwards:
595 start_pfn = PFN_UP(__pa(&_end));
596 end_pfn = max_pfn = PFN_DOWN(memory_end);
598 /* Initialize storage key for kernel pages */
599 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
600 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
602 #ifdef CONFIG_BLK_DEV_INITRD
604 * Move the initrd in case the bitmap of the bootmem allocater
605 * would overwrite it.
608 if (INITRD_START && INITRD_SIZE) {
609 unsigned long bmap_size;
612 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
613 bmap_size = PFN_PHYS(bmap_size);
615 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
616 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
618 if (start + INITRD_SIZE > memory_end) {
619 printk("initrd extends beyond end of memory "
620 "(0x%08lx > 0x%08lx)\n"
621 "disabling initrd\n",
622 start + INITRD_SIZE, memory_end);
623 INITRD_START = INITRD_SIZE = 0;
625 printk("Moving initrd (0x%08lx -> 0x%08lx, "
627 INITRD_START, start, INITRD_SIZE);
628 memmove((void *) start, (void *) INITRD_START,
630 INITRD_START = start;
637 * Initialize the boot-time allocator
639 bootmap_size = init_bootmem(start_pfn, end_pfn);
642 * Register RAM areas with the bootmem allocator.
645 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
646 unsigned long start_chunk, end_chunk, pfn;
648 if (memory_chunk[i].type != CHUNK_READ_WRITE)
650 start_chunk = PFN_DOWN(memory_chunk[i].addr);
651 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
652 end_chunk = min(end_chunk, end_pfn);
653 if (start_chunk >= end_chunk)
655 add_active_range(0, start_chunk, end_chunk);
656 pfn = max(start_chunk, start_pfn);
657 for (; pfn <= end_chunk; pfn++)
658 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
661 psw_set_key(PAGE_DEFAULT_KEY);
663 free_bootmem_with_active_regions(0, max_pfn);
664 reserve_bootmem(0, PFN_PHYS(start_pfn));
667 * Reserve the bootmem bitmap itself as well. We do this in two
668 * steps (first step was init_bootmem()) because this catches
669 * the (very unlikely) case of us accidentally initializing the
670 * bootmem allocator with an invalid RAM area.
672 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
674 #ifdef CONFIG_BLK_DEV_INITRD
675 if (INITRD_START && INITRD_SIZE) {
676 if (INITRD_START + INITRD_SIZE <= memory_end) {
677 reserve_bootmem(INITRD_START, INITRD_SIZE);
678 initrd_start = INITRD_START;
679 initrd_end = initrd_start + INITRD_SIZE;
681 printk("initrd extends beyond end of memory "
682 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
683 initrd_start + INITRD_SIZE, memory_end);
684 initrd_start = initrd_end = 0;
691 * Setup function called from init/main.c just after the banner
696 setup_arch(char **cmdline_p)
699 * print what head.S has found out about the machine
702 printk((MACHINE_IS_VM) ?
703 "We are running under VM (31 bit mode)\n" :
704 "We are running native (31 bit mode)\n");
705 printk((MACHINE_HAS_IEEE) ?
706 "This machine has an IEEE fpu\n" :
707 "This machine has no IEEE fpu\n");
708 #else /* CONFIG_64BIT */
709 printk((MACHINE_IS_VM) ?
710 "We are running under VM (64 bit mode)\n" :
711 "We are running native (64 bit mode)\n");
712 #endif /* CONFIG_64BIT */
714 /* Save unparsed command line copy for /proc/cmdline */
715 strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
717 *cmdline_p = COMMAND_LINE;
718 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
720 ROOT_DEV = Root_RAM0;
722 init_mm.start_code = PAGE_OFFSET;
723 init_mm.end_code = (unsigned long) &_etext;
724 init_mm.end_data = (unsigned long) &_edata;
725 init_mm.brk = (unsigned long) &_end;
727 if (MACHINE_HAS_MVCOS)
728 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
730 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
735 setup_addressing_mode();
741 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
742 smp_setup_cpu_possible_map();
745 * Create kernel page tables and switch to virtual addressing.
749 /* Setup default console */
753 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
759 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
764 cpuinfo->cpu_id.version,
765 cpuinfo->cpu_id.ident,
766 cpuinfo->cpu_id.machine,
767 cpuinfo->cpu_id.unused);
771 * show_cpuinfo - Get information on one CPU for use by procfs.
774 static int show_cpuinfo(struct seq_file *m, void *v)
776 struct cpuinfo_S390 *cpuinfo;
777 unsigned long n = (unsigned long) v - 1;
781 seq_printf(m, "vendor_id : IBM/S390\n"
782 "# processors : %i\n"
783 "bogomips per cpu: %lu.%02lu\n",
784 num_online_cpus(), loops_per_jiffy/(500000/HZ),
785 (loops_per_jiffy/(5000/HZ))%100);
789 if (smp_processor_id() == n)
790 cpuinfo = &S390_lowcore.cpu_data;
792 cpuinfo = &lowcore_ptr[n]->cpu_data;
794 cpuinfo = &S390_lowcore.cpu_data;
796 seq_printf(m, "processor %li: "
798 "identification = %06X, "
800 n, cpuinfo->cpu_id.version,
801 cpuinfo->cpu_id.ident,
802 cpuinfo->cpu_id.machine);
808 static void *c_start(struct seq_file *m, loff_t *pos)
810 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
812 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
815 return c_start(m, pos);
817 static void c_stop(struct seq_file *m, void *v)
820 struct seq_operations cpuinfo_op = {
824 .show = show_cpuinfo,