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>
42 #include <asm/uaccess.h>
43 #include <asm/system.h>
45 #include <asm/mmu_context.h>
46 #include <asm/cpcmd.h>
47 #include <asm/lowcore.h>
50 #include <asm/ptrace.h>
51 #include <asm/sections.h>
54 * User copy operations.
56 struct uaccess_ops uaccess;
57 EXPORT_SYMBOL_GPL(uaccess);
62 unsigned int console_mode = 0;
63 unsigned int console_devno = -1;
64 unsigned int console_irq = -1;
65 unsigned long memory_size = 0;
66 unsigned long machine_flags = 0;
68 unsigned long addr, size, type;
69 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
70 #define CHUNK_READ_WRITE 0
71 #define CHUNK_READ_ONLY 1
72 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
73 static unsigned long __initdata memory_end;
76 * This is set up by the setup-routine at boot-time
77 * for S390 need to find out, what we have to setup
78 * using address 0x10400 ...
81 #include <asm/setup.h>
83 static struct resource code_resource = {
84 .name = "Kernel code",
85 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
88 static struct resource data_resource = {
89 .name = "Kernel data",
90 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
94 * cpu_init() initializes state that is per-CPU.
96 void __devinit cpu_init (void)
98 int addr = hard_smp_processor_id();
101 * Store processor id in lowcore (used e.g. in timer_interrupt)
103 asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
104 S390_lowcore.cpu_data.cpu_addr = addr;
107 * Force FPU initialization:
109 clear_thread_flag(TIF_USEDFPU);
112 atomic_inc(&init_mm.mm_count);
113 current->active_mm = &init_mm;
116 enter_lazy_tlb(&init_mm, current);
120 * VM halt and poweroff setup routines
122 char vmhalt_cmd[128] = "";
123 char vmpoff_cmd[128] = "";
124 char vmpanic_cmd[128] = "";
126 static inline void strncpy_skip_quote(char *dst, char *src, int n)
131 for (sx = 0; src[sx] != 0; sx++) {
132 if (src[sx] == '"') continue;
138 static int __init vmhalt_setup(char *str)
140 strncpy_skip_quote(vmhalt_cmd, str, 127);
145 __setup("vmhalt=", vmhalt_setup);
147 static int __init vmpoff_setup(char *str)
149 strncpy_skip_quote(vmpoff_cmd, str, 127);
154 __setup("vmpoff=", vmpoff_setup);
156 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
159 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
160 cpcmd(vmpanic_cmd, NULL, 0, NULL);
165 #define PANIC_PRI_VMPANIC 0
167 static struct notifier_block vmpanic_nb = {
168 .notifier_call = vmpanic_notify,
169 .priority = PANIC_PRI_VMPANIC
172 static int __init vmpanic_setup(char *str)
174 static int register_done __initdata = 0;
176 strncpy_skip_quote(vmpanic_cmd, str, 127);
177 vmpanic_cmd[127] = 0;
178 if (!register_done) {
180 atomic_notifier_chain_register(&panic_notifier_list,
186 __setup("vmpanic=", vmpanic_setup);
189 * condev= and conmode= setup parameter.
192 static int __init condev_setup(char *str)
196 vdev = simple_strtoul(str, &str, 0);
197 if (vdev >= 0 && vdev < 65536) {
198 console_devno = vdev;
204 __setup("condev=", condev_setup);
206 static int __init conmode_setup(char *str)
208 #if defined(CONFIG_SCLP_CONSOLE)
209 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
212 #if defined(CONFIG_TN3215_CONSOLE)
213 if (strncmp(str, "3215", 5) == 0)
216 #if defined(CONFIG_TN3270_CONSOLE)
217 if (strncmp(str, "3270", 5) == 0)
223 __setup("conmode=", conmode_setup);
225 static void __init conmode_default(void)
227 char query_buffer[1024];
231 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
232 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
233 ptr = strstr(query_buffer, "SUBCHANNEL =");
234 console_irq = simple_strtoul(ptr + 13, NULL, 16);
235 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
236 ptr = strstr(query_buffer, "CONMODE");
238 * Set the conmode to 3215 so that the device recognition
239 * will set the cu_type of the console to 3215. If the
240 * conmode is 3270 and we don't set it back then both
241 * 3215 and the 3270 driver will try to access the console
242 * device (3215 as console and 3270 as normal tty).
244 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
246 #if defined(CONFIG_SCLP_CONSOLE)
251 if (strncmp(ptr + 8, "3270", 4) == 0) {
252 #if defined(CONFIG_TN3270_CONSOLE)
254 #elif defined(CONFIG_TN3215_CONSOLE)
256 #elif defined(CONFIG_SCLP_CONSOLE)
259 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
260 #if defined(CONFIG_TN3215_CONSOLE)
262 #elif defined(CONFIG_TN3270_CONSOLE)
264 #elif defined(CONFIG_SCLP_CONSOLE)
268 } else if (MACHINE_IS_P390) {
269 #if defined(CONFIG_TN3215_CONSOLE)
271 #elif defined(CONFIG_TN3270_CONSOLE)
275 #if defined(CONFIG_SCLP_CONSOLE)
282 extern void machine_restart_smp(char *);
283 extern void machine_halt_smp(void);
284 extern void machine_power_off_smp(void);
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);
400 * Setup lowcore for boot cpu
402 lc_pages = sizeof(void *) == 8 ? 2 : 1;
403 lc = (struct _lowcore *)
404 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
405 memset(lc, 0, lc_pages * PAGE_SIZE);
406 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
407 lc->restart_psw.addr =
408 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
409 lc->external_new_psw.mask = PSW_KERNEL_BITS;
410 lc->external_new_psw.addr =
411 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
412 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
413 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
414 lc->program_new_psw.mask = PSW_KERNEL_BITS;
415 lc->program_new_psw.addr =
416 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
417 lc->mcck_new_psw.mask =
418 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
419 lc->mcck_new_psw.addr =
420 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
421 lc->io_new_psw.mask = PSW_KERNEL_BITS;
422 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
423 lc->ipl_device = S390_lowcore.ipl_device;
424 lc->jiffy_timer = -1LL;
425 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
426 lc->async_stack = (unsigned long)
427 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
428 lc->panic_stack = (unsigned long)
429 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
430 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
431 lc->thread_info = (unsigned long) &init_thread_union;
433 if (MACHINE_HAS_IEEE) {
434 lc->extended_save_area_addr = (__u32)
435 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
436 /* enable extended save area */
440 set_prefix((u32)(unsigned long) lc);
444 setup_resources(void)
446 struct resource *res;
449 code_resource.start = (unsigned long) &_text;
450 code_resource.end = (unsigned long) &_etext - 1;
451 data_resource.start = (unsigned long) &_etext;
452 data_resource.end = (unsigned long) &_edata - 1;
454 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
455 res = alloc_bootmem_low(sizeof(struct resource));
456 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
457 switch (memory_chunk[i].type) {
458 case CHUNK_READ_WRITE:
459 res->name = "System RAM";
461 case CHUNK_READ_ONLY:
462 res->name = "System ROM";
463 res->flags |= IORESOURCE_READONLY;
466 res->name = "reserved";
468 res->start = memory_chunk[i].addr;
469 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
470 request_resource(&iomem_resource, res);
471 request_resource(res, &code_resource);
472 request_resource(res, &data_resource);
479 unsigned long bootmap_size;
480 unsigned long start_pfn, end_pfn, init_pfn;
484 * partially used pages are not usable - thus
485 * we are rounding upwards:
487 start_pfn = PFN_UP(__pa(&_end));
488 end_pfn = max_pfn = PFN_DOWN(memory_end);
490 /* Initialize storage key for kernel pages */
491 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
492 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
494 #ifdef CONFIG_BLK_DEV_INITRD
496 * Move the initrd in case the bitmap of the bootmem allocater
497 * would overwrite it.
500 if (INITRD_START && INITRD_SIZE) {
501 unsigned long bmap_size;
504 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
505 bmap_size = PFN_PHYS(bmap_size);
507 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
508 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
510 if (start + INITRD_SIZE > memory_end) {
511 printk("initrd extends beyond end of memory "
512 "(0x%08lx > 0x%08lx)\n"
513 "disabling initrd\n",
514 start + INITRD_SIZE, memory_end);
515 INITRD_START = INITRD_SIZE = 0;
517 printk("Moving initrd (0x%08lx -> 0x%08lx, "
519 INITRD_START, start, INITRD_SIZE);
520 memmove((void *) start, (void *) INITRD_START,
522 INITRD_START = start;
529 * Initialize the boot-time allocator
531 bootmap_size = init_bootmem(start_pfn, end_pfn);
534 * Register RAM areas with the bootmem allocator.
537 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
538 unsigned long start_chunk, end_chunk, pfn;
540 if (memory_chunk[i].type != CHUNK_READ_WRITE)
542 start_chunk = PFN_DOWN(memory_chunk[i].addr);
543 end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size) - 1;
544 end_chunk = min(end_chunk, end_pfn);
545 if (start_chunk >= end_chunk)
547 add_active_range(0, start_chunk, end_chunk);
548 pfn = max(start_chunk, start_pfn);
549 for (; pfn <= end_chunk; pfn++)
550 page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
553 psw_set_key(PAGE_DEFAULT_KEY);
555 free_bootmem_with_active_regions(0, max_pfn);
556 reserve_bootmem(0, PFN_PHYS(start_pfn));
559 * Reserve the bootmem bitmap itself as well. We do this in two
560 * steps (first step was init_bootmem()) because this catches
561 * the (very unlikely) case of us accidentally initializing the
562 * bootmem allocator with an invalid RAM area.
564 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
566 #ifdef CONFIG_BLK_DEV_INITRD
567 if (INITRD_START && INITRD_SIZE) {
568 if (INITRD_START + INITRD_SIZE <= memory_end) {
569 reserve_bootmem(INITRD_START, INITRD_SIZE);
570 initrd_start = INITRD_START;
571 initrd_end = initrd_start + INITRD_SIZE;
573 printk("initrd extends beyond end of memory "
574 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
575 initrd_start + INITRD_SIZE, memory_end);
576 initrd_start = initrd_end = 0;
583 * Setup function called from init/main.c just after the banner
588 setup_arch(char **cmdline_p)
591 * print what head.S has found out about the machine
594 printk((MACHINE_IS_VM) ?
595 "We are running under VM (31 bit mode)\n" :
596 "We are running native (31 bit mode)\n");
597 printk((MACHINE_HAS_IEEE) ?
598 "This machine has an IEEE fpu\n" :
599 "This machine has no IEEE fpu\n");
600 #else /* CONFIG_64BIT */
601 printk((MACHINE_IS_VM) ?
602 "We are running under VM (64 bit mode)\n" :
603 "We are running native (64 bit mode)\n");
604 #endif /* CONFIG_64BIT */
606 /* Save unparsed command line copy for /proc/cmdline */
607 strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
609 *cmdline_p = COMMAND_LINE;
610 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
612 ROOT_DEV = Root_RAM0;
614 init_mm.start_code = PAGE_OFFSET;
615 init_mm.end_code = (unsigned long) &_etext;
616 init_mm.end_data = (unsigned long) &_edata;
617 init_mm.brk = (unsigned long) &_end;
619 memory_end = memory_size;
621 if (MACHINE_HAS_MVCOS)
622 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
624 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
629 memory_end &= ~0x400000UL;
632 * We need some free virtual space to be able to do vmalloc.
633 * On a machine with 2GB memory we make sure that we have at
634 * least 128 MB free space for vmalloc.
636 if (memory_end > 1920*1024*1024)
637 memory_end = 1920*1024*1024;
638 #else /* CONFIG_64BIT */
639 memory_end &= ~0x200000UL;
640 #endif /* CONFIG_64BIT */
647 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
648 smp_setup_cpu_possible_map();
651 * Create kernel page tables and switch to virtual addressing.
655 /* Setup default console */
659 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
665 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
670 cpuinfo->cpu_id.version,
671 cpuinfo->cpu_id.ident,
672 cpuinfo->cpu_id.machine,
673 cpuinfo->cpu_id.unused);
677 * show_cpuinfo - Get information on one CPU for use by procfs.
680 static int show_cpuinfo(struct seq_file *m, void *v)
682 struct cpuinfo_S390 *cpuinfo;
683 unsigned long n = (unsigned long) v - 1;
687 seq_printf(m, "vendor_id : IBM/S390\n"
688 "# processors : %i\n"
689 "bogomips per cpu: %lu.%02lu\n",
690 num_online_cpus(), loops_per_jiffy/(500000/HZ),
691 (loops_per_jiffy/(5000/HZ))%100);
695 if (smp_processor_id() == n)
696 cpuinfo = &S390_lowcore.cpu_data;
698 cpuinfo = &lowcore_ptr[n]->cpu_data;
700 cpuinfo = &S390_lowcore.cpu_data;
702 seq_printf(m, "processor %li: "
704 "identification = %06X, "
706 n, cpuinfo->cpu_id.version,
707 cpuinfo->cpu_id.ident,
708 cpuinfo->cpu_id.machine);
714 static void *c_start(struct seq_file *m, loff_t *pos)
716 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
718 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
721 return c_start(m, pos);
723 static void c_stop(struct seq_file *m, void *v)
726 struct seq_operations cpuinfo_op = {
730 .show = show_cpuinfo,