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 struct mem_chunk memory_chunk[MEMORY_CHUNKS];
69 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
70 unsigned long __initdata zholes_size[MAX_NR_ZONES];
71 static unsigned long __initdata memory_end;
74 * This is set up by the setup-routine at boot-time
75 * for S390 need to find out, what we have to setup
76 * using address 0x10400 ...
79 #include <asm/setup.h>
81 static struct resource code_resource = {
82 .name = "Kernel code",
83 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
86 static struct resource data_resource = {
87 .name = "Kernel data",
88 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
92 * cpu_init() initializes state that is per-CPU.
94 void __devinit cpu_init (void)
96 int addr = hard_smp_processor_id();
99 * Store processor id in lowcore (used e.g. in timer_interrupt)
101 asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
102 S390_lowcore.cpu_data.cpu_addr = addr;
105 * Force FPU initialization:
107 clear_thread_flag(TIF_USEDFPU);
110 atomic_inc(&init_mm.mm_count);
111 current->active_mm = &init_mm;
114 enter_lazy_tlb(&init_mm, current);
118 * VM halt and poweroff setup routines
120 char vmhalt_cmd[128] = "";
121 char vmpoff_cmd[128] = "";
122 char vmpanic_cmd[128] = "";
124 static inline void strncpy_skip_quote(char *dst, char *src, int n)
129 for (sx = 0; src[sx] != 0; sx++) {
130 if (src[sx] == '"') continue;
136 static int __init vmhalt_setup(char *str)
138 strncpy_skip_quote(vmhalt_cmd, str, 127);
143 __setup("vmhalt=", vmhalt_setup);
145 static int __init vmpoff_setup(char *str)
147 strncpy_skip_quote(vmpoff_cmd, str, 127);
152 __setup("vmpoff=", vmpoff_setup);
154 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
157 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
158 cpcmd(vmpanic_cmd, NULL, 0, NULL);
163 #define PANIC_PRI_VMPANIC 0
165 static struct notifier_block vmpanic_nb = {
166 .notifier_call = vmpanic_notify,
167 .priority = PANIC_PRI_VMPANIC
170 static int __init vmpanic_setup(char *str)
172 static int register_done __initdata = 0;
174 strncpy_skip_quote(vmpanic_cmd, str, 127);
175 vmpanic_cmd[127] = 0;
176 if (!register_done) {
178 atomic_notifier_chain_register(&panic_notifier_list,
184 __setup("vmpanic=", vmpanic_setup);
187 * condev= and conmode= setup parameter.
190 static int __init condev_setup(char *str)
194 vdev = simple_strtoul(str, &str, 0);
195 if (vdev >= 0 && vdev < 65536) {
196 console_devno = vdev;
202 __setup("condev=", condev_setup);
204 static int __init conmode_setup(char *str)
206 #if defined(CONFIG_SCLP_CONSOLE)
207 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
210 #if defined(CONFIG_TN3215_CONSOLE)
211 if (strncmp(str, "3215", 5) == 0)
214 #if defined(CONFIG_TN3270_CONSOLE)
215 if (strncmp(str, "3270", 5) == 0)
221 __setup("conmode=", conmode_setup);
223 static void __init conmode_default(void)
225 char query_buffer[1024];
229 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
230 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
231 ptr = strstr(query_buffer, "SUBCHANNEL =");
232 console_irq = simple_strtoul(ptr + 13, NULL, 16);
233 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
234 ptr = strstr(query_buffer, "CONMODE");
236 * Set the conmode to 3215 so that the device recognition
237 * will set the cu_type of the console to 3215. If the
238 * conmode is 3270 and we don't set it back then both
239 * 3215 and the 3270 driver will try to access the console
240 * device (3215 as console and 3270 as normal tty).
242 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
244 #if defined(CONFIG_SCLP_CONSOLE)
249 if (strncmp(ptr + 8, "3270", 4) == 0) {
250 #if defined(CONFIG_TN3270_CONSOLE)
252 #elif defined(CONFIG_TN3215_CONSOLE)
254 #elif defined(CONFIG_SCLP_CONSOLE)
257 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
258 #if defined(CONFIG_TN3215_CONSOLE)
260 #elif defined(CONFIG_TN3270_CONSOLE)
262 #elif defined(CONFIG_SCLP_CONSOLE)
266 } else if (MACHINE_IS_P390) {
267 #if defined(CONFIG_TN3215_CONSOLE)
269 #elif defined(CONFIG_TN3270_CONSOLE)
273 #if defined(CONFIG_SCLP_CONSOLE)
280 extern void machine_restart_smp(char *);
281 extern void machine_halt_smp(void);
282 extern void machine_power_off_smp(void);
284 void (*_machine_restart)(char *command) = machine_restart_smp;
285 void (*_machine_halt)(void) = machine_halt_smp;
286 void (*_machine_power_off)(void) = machine_power_off_smp;
289 * Reboot, halt and power_off routines for non SMP.
291 static void do_machine_restart_nonsmp(char * __unused)
296 static void do_machine_halt_nonsmp(void)
298 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
299 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
300 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
303 static void do_machine_power_off_nonsmp(void)
305 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
306 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
307 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
310 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
311 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
312 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
316 * Reboot, halt and power_off stubs. They just call _machine_restart,
317 * _machine_halt or _machine_power_off.
320 void machine_restart(char *command)
322 if (!in_interrupt() || oops_in_progress)
324 * Only unblank the console if we are called in enabled
325 * context or a bust_spinlocks cleared the way for us.
328 _machine_restart(command);
331 void machine_halt(void)
333 if (!in_interrupt() || oops_in_progress)
335 * Only unblank the console if we are called in enabled
336 * context or a bust_spinlocks cleared the way for us.
342 void machine_power_off(void)
344 if (!in_interrupt() || oops_in_progress)
346 * Only unblank the console if we are called in enabled
347 * context or a bust_spinlocks cleared the way for us.
350 _machine_power_off();
354 * Dummy power off function.
356 void (*pm_power_off)(void) = machine_power_off;
359 add_memory_hole(unsigned long start, unsigned long end)
361 unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
364 zholes_size[ZONE_DMA] += end - start + 1;
365 else if (start > dma_pfn)
366 zholes_size[ZONE_NORMAL] += end - start + 1;
368 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
369 zholes_size[ZONE_NORMAL] += end - dma_pfn;
373 static int __init early_parse_mem(char *p)
375 memory_end = memparse(p, &p);
378 early_param("mem", early_parse_mem);
381 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
383 static int __init early_parse_ipldelay(char *p)
385 unsigned long delay = 0;
387 delay = simple_strtoul(p, &p, 0);
396 delay *= 60 * 1000000;
399 /* now wait for the requested amount of time */
404 early_param("ipldelay", early_parse_ipldelay);
413 * Setup lowcore for boot cpu
415 lc_pages = sizeof(void *) == 8 ? 2 : 1;
416 lc = (struct _lowcore *)
417 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
418 memset(lc, 0, lc_pages * PAGE_SIZE);
419 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
420 lc->restart_psw.addr =
421 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
422 lc->external_new_psw.mask = PSW_KERNEL_BITS;
423 lc->external_new_psw.addr =
424 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
425 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
426 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
427 lc->program_new_psw.mask = PSW_KERNEL_BITS;
428 lc->program_new_psw.addr =
429 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
430 lc->mcck_new_psw.mask =
431 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
432 lc->mcck_new_psw.addr =
433 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
434 lc->io_new_psw.mask = PSW_KERNEL_BITS;
435 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
436 lc->ipl_device = S390_lowcore.ipl_device;
437 lc->jiffy_timer = -1LL;
438 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
439 lc->async_stack = (unsigned long)
440 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
441 lc->panic_stack = (unsigned long)
442 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
443 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
444 lc->thread_info = (unsigned long) &init_thread_union;
446 if (MACHINE_HAS_IEEE) {
447 lc->extended_save_area_addr = (__u32)
448 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
449 /* enable extended save area */
450 __ctl_set_bit(14, 29);
453 set_prefix((u32)(unsigned long) lc);
457 setup_resources(void)
459 struct resource *res;
462 code_resource.start = (unsigned long) &_text;
463 code_resource.end = (unsigned long) &_etext - 1;
464 data_resource.start = (unsigned long) &_etext;
465 data_resource.end = (unsigned long) &_edata - 1;
467 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
468 res = alloc_bootmem_low(sizeof(struct resource));
469 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
470 switch (memory_chunk[i].type) {
471 case CHUNK_READ_WRITE:
472 res->name = "System RAM";
474 case CHUNK_READ_ONLY:
475 res->name = "System ROM";
476 res->flags |= IORESOURCE_READONLY;
479 res->name = "reserved";
481 res->start = memory_chunk[i].addr;
482 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
483 request_resource(&iomem_resource, res);
484 request_resource(res, &code_resource);
485 request_resource(res, &data_resource);
492 unsigned long bootmap_size;
493 unsigned long start_pfn, end_pfn, init_pfn;
494 unsigned long last_rw_end;
498 * partially used pages are not usable - thus
499 * we are rounding upwards:
501 start_pfn = PFN_UP(__pa(&_end));
502 end_pfn = max_pfn = PFN_DOWN(memory_end);
504 /* Initialize storage key for kernel pages */
505 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
506 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
508 #ifdef CONFIG_BLK_DEV_INITRD
510 * Move the initrd in case the bitmap of the bootmem allocater
511 * would overwrite it.
514 if (INITRD_START && INITRD_SIZE) {
515 unsigned long bmap_size;
518 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
519 bmap_size = PFN_PHYS(bmap_size);
521 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
522 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
524 if (start + INITRD_SIZE > memory_end) {
525 printk("initrd extends beyond end of memory "
526 "(0x%08lx > 0x%08lx)\n"
527 "disabling initrd\n",
528 start + INITRD_SIZE, memory_end);
529 INITRD_START = INITRD_SIZE = 0;
531 printk("Moving initrd (0x%08lx -> 0x%08lx, "
533 INITRD_START, start, INITRD_SIZE);
534 memmove((void *) start, (void *) INITRD_START,
536 INITRD_START = start;
543 * Initialize the boot-time allocator
545 bootmap_size = init_bootmem(start_pfn, end_pfn);
548 * Register RAM areas with the bootmem allocator.
550 last_rw_end = start_pfn;
552 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
553 unsigned long start_chunk, end_chunk;
555 if (memory_chunk[i].type != CHUNK_READ_WRITE)
557 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
558 start_chunk >>= PAGE_SHIFT;
559 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
560 end_chunk >>= PAGE_SHIFT;
561 if (start_chunk < start_pfn)
562 start_chunk = start_pfn;
563 if (end_chunk > end_pfn)
565 if (start_chunk < end_chunk) {
566 /* Initialize storage key for RAM pages */
567 for (init_pfn = start_chunk ; init_pfn < end_chunk;
569 page_set_storage_key(init_pfn << PAGE_SHIFT,
571 free_bootmem(start_chunk << PAGE_SHIFT,
572 (end_chunk - start_chunk) << PAGE_SHIFT);
573 if (last_rw_end < start_chunk)
574 add_memory_hole(last_rw_end, start_chunk - 1);
575 last_rw_end = end_chunk;
579 psw_set_key(PAGE_DEFAULT_KEY);
581 if (last_rw_end < end_pfn - 1)
582 add_memory_hole(last_rw_end, end_pfn - 1);
585 * Reserve the bootmem bitmap itself as well. We do this in two
586 * steps (first step was init_bootmem()) because this catches
587 * the (very unlikely) case of us accidentally initializing the
588 * bootmem allocator with an invalid RAM area.
590 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
592 #ifdef CONFIG_BLK_DEV_INITRD
593 if (INITRD_START && INITRD_SIZE) {
594 if (INITRD_START + INITRD_SIZE <= memory_end) {
595 reserve_bootmem(INITRD_START, INITRD_SIZE);
596 initrd_start = INITRD_START;
597 initrd_end = initrd_start + INITRD_SIZE;
599 printk("initrd extends beyond end of memory "
600 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
601 initrd_start + INITRD_SIZE, memory_end);
602 initrd_start = initrd_end = 0;
609 * Setup function called from init/main.c just after the banner
614 setup_arch(char **cmdline_p)
617 * print what head.S has found out about the machine
620 printk((MACHINE_IS_VM) ?
621 "We are running under VM (31 bit mode)\n" :
622 "We are running native (31 bit mode)\n");
623 printk((MACHINE_HAS_IEEE) ?
624 "This machine has an IEEE fpu\n" :
625 "This machine has no IEEE fpu\n");
626 #else /* CONFIG_64BIT */
627 printk((MACHINE_IS_VM) ?
628 "We are running under VM (64 bit mode)\n" :
629 "We are running native (64 bit mode)\n");
630 #endif /* CONFIG_64BIT */
632 /* Save unparsed command line copy for /proc/cmdline */
633 strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
635 *cmdline_p = COMMAND_LINE;
636 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
638 ROOT_DEV = Root_RAM0;
640 init_mm.start_code = PAGE_OFFSET;
641 init_mm.end_code = (unsigned long) &_etext;
642 init_mm.end_data = (unsigned long) &_edata;
643 init_mm.brk = (unsigned long) &_end;
645 memory_end = memory_size;
647 if (MACHINE_HAS_MVCOS)
648 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
650 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
655 memory_end &= ~0x400000UL;
658 * We need some free virtual space to be able to do vmalloc.
659 * On a machine with 2GB memory we make sure that we have at
660 * least 128 MB free space for vmalloc.
662 if (memory_end > 1920*1024*1024)
663 memory_end = 1920*1024*1024;
664 #else /* CONFIG_64BIT */
665 memory_end &= ~0x200000UL;
666 #endif /* CONFIG_64BIT */
673 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
674 smp_setup_cpu_possible_map();
677 * Create kernel page tables and switch to virtual addressing.
681 /* Setup default console */
685 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
691 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
696 cpuinfo->cpu_id.version,
697 cpuinfo->cpu_id.ident,
698 cpuinfo->cpu_id.machine,
699 cpuinfo->cpu_id.unused);
703 * show_cpuinfo - Get information on one CPU for use by procfs.
706 static int show_cpuinfo(struct seq_file *m, void *v)
708 struct cpuinfo_S390 *cpuinfo;
709 unsigned long n = (unsigned long) v - 1;
713 seq_printf(m, "vendor_id : IBM/S390\n"
714 "# processors : %i\n"
715 "bogomips per cpu: %lu.%02lu\n",
716 num_online_cpus(), loops_per_jiffy/(500000/HZ),
717 (loops_per_jiffy/(5000/HZ))%100);
721 if (smp_processor_id() == n)
722 cpuinfo = &S390_lowcore.cpu_data;
724 cpuinfo = &lowcore_ptr[n]->cpu_data;
726 cpuinfo = &S390_lowcore.cpu_data;
728 seq_printf(m, "processor %li: "
730 "identification = %06X, "
732 n, cpuinfo->cpu_id.version,
733 cpuinfo->cpu_id.ident,
734 cpuinfo->cpu_id.machine);
740 static void *c_start(struct seq_file *m, loff_t *pos)
742 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
744 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
747 return c_start(m, pos);
749 static void c_stop(struct seq_file *m, void *v)
752 struct seq_operations cpuinfo_op = {
756 .show = show_cpuinfo,