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 machine_flags = 0;
67 struct mem_chunk memory_chunk[MEMORY_CHUNKS];
68 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
69 unsigned long __initdata zholes_size[MAX_NR_ZONES];
70 static unsigned long __initdata memory_end;
73 * This is set up by the setup-routine at boot-time
74 * for S390 need to find out, what we have to setup
75 * using address 0x10400 ...
78 #include <asm/setup.h>
80 static struct resource code_resource = {
81 .name = "Kernel code",
82 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
85 static struct resource data_resource = {
86 .name = "Kernel data",
87 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
91 * cpu_init() initializes state that is per-CPU.
93 void __devinit cpu_init (void)
95 int addr = hard_smp_processor_id();
98 * Store processor id in lowcore (used e.g. in timer_interrupt)
100 asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
101 S390_lowcore.cpu_data.cpu_addr = addr;
104 * Force FPU initialization:
106 clear_thread_flag(TIF_USEDFPU);
109 atomic_inc(&init_mm.mm_count);
110 current->active_mm = &init_mm;
113 enter_lazy_tlb(&init_mm, current);
117 * VM halt and poweroff setup routines
119 char vmhalt_cmd[128] = "";
120 char vmpoff_cmd[128] = "";
121 char vmpanic_cmd[128] = "";
123 static inline void strncpy_skip_quote(char *dst, char *src, int n)
128 for (sx = 0; src[sx] != 0; sx++) {
129 if (src[sx] == '"') continue;
135 static int __init vmhalt_setup(char *str)
137 strncpy_skip_quote(vmhalt_cmd, str, 127);
142 __setup("vmhalt=", vmhalt_setup);
144 static int __init vmpoff_setup(char *str)
146 strncpy_skip_quote(vmpoff_cmd, str, 127);
151 __setup("vmpoff=", vmpoff_setup);
153 static int vmpanic_notify(struct notifier_block *self, unsigned long event,
156 if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
157 cpcmd(vmpanic_cmd, NULL, 0, NULL);
162 #define PANIC_PRI_VMPANIC 0
164 static struct notifier_block vmpanic_nb = {
165 .notifier_call = vmpanic_notify,
166 .priority = PANIC_PRI_VMPANIC
169 static int __init vmpanic_setup(char *str)
171 static int register_done __initdata = 0;
173 strncpy_skip_quote(vmpanic_cmd, str, 127);
174 vmpanic_cmd[127] = 0;
175 if (!register_done) {
177 atomic_notifier_chain_register(&panic_notifier_list,
183 __setup("vmpanic=", vmpanic_setup);
186 * condev= and conmode= setup parameter.
189 static int __init condev_setup(char *str)
193 vdev = simple_strtoul(str, &str, 0);
194 if (vdev >= 0 && vdev < 65536) {
195 console_devno = vdev;
201 __setup("condev=", condev_setup);
203 static int __init conmode_setup(char *str)
205 #if defined(CONFIG_SCLP_CONSOLE)
206 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
209 #if defined(CONFIG_TN3215_CONSOLE)
210 if (strncmp(str, "3215", 5) == 0)
213 #if defined(CONFIG_TN3270_CONSOLE)
214 if (strncmp(str, "3270", 5) == 0)
220 __setup("conmode=", conmode_setup);
222 static void __init conmode_default(void)
224 char query_buffer[1024];
228 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
229 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
230 ptr = strstr(query_buffer, "SUBCHANNEL =");
231 console_irq = simple_strtoul(ptr + 13, NULL, 16);
232 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
233 ptr = strstr(query_buffer, "CONMODE");
235 * Set the conmode to 3215 so that the device recognition
236 * will set the cu_type of the console to 3215. If the
237 * conmode is 3270 and we don't set it back then both
238 * 3215 and the 3270 driver will try to access the console
239 * device (3215 as console and 3270 as normal tty).
241 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
243 #if defined(CONFIG_SCLP_CONSOLE)
248 if (strncmp(ptr + 8, "3270", 4) == 0) {
249 #if defined(CONFIG_TN3270_CONSOLE)
251 #elif defined(CONFIG_TN3215_CONSOLE)
253 #elif defined(CONFIG_SCLP_CONSOLE)
256 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
257 #if defined(CONFIG_TN3215_CONSOLE)
259 #elif defined(CONFIG_TN3270_CONSOLE)
261 #elif defined(CONFIG_SCLP_CONSOLE)
265 } else if (MACHINE_IS_P390) {
266 #if defined(CONFIG_TN3215_CONSOLE)
268 #elif defined(CONFIG_TN3270_CONSOLE)
272 #if defined(CONFIG_SCLP_CONSOLE)
279 extern void machine_restart_smp(char *);
280 extern void machine_halt_smp(void);
281 extern void machine_power_off_smp(void);
283 void (*_machine_restart)(char *command) = machine_restart_smp;
284 void (*_machine_halt)(void) = machine_halt_smp;
285 void (*_machine_power_off)(void) = machine_power_off_smp;
288 * Reboot, halt and power_off routines for non SMP.
290 static void do_machine_restart_nonsmp(char * __unused)
295 static void do_machine_halt_nonsmp(void)
297 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
298 __cpcmd(vmhalt_cmd, NULL, 0, NULL);
299 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
302 static void do_machine_power_off_nonsmp(void)
304 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
305 __cpcmd(vmpoff_cmd, NULL, 0, NULL);
306 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
309 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
310 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
311 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
315 * Reboot, halt and power_off stubs. They just call _machine_restart,
316 * _machine_halt or _machine_power_off.
319 void machine_restart(char *command)
321 if (!in_interrupt() || oops_in_progress)
323 * Only unblank the console if we are called in enabled
324 * context or a bust_spinlocks cleared the way for us.
327 _machine_restart(command);
330 void machine_halt(void)
332 if (!in_interrupt() || oops_in_progress)
334 * Only unblank the console if we are called in enabled
335 * context or a bust_spinlocks cleared the way for us.
341 void machine_power_off(void)
343 if (!in_interrupt() || oops_in_progress)
345 * Only unblank the console if we are called in enabled
346 * context or a bust_spinlocks cleared the way for us.
349 _machine_power_off();
353 * Dummy power off function.
355 void (*pm_power_off)(void) = machine_power_off;
358 add_memory_hole(unsigned long start, unsigned long end)
360 unsigned long dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
363 zholes_size[ZONE_DMA] += end - start + 1;
364 else if (start > dma_pfn)
365 zholes_size[ZONE_NORMAL] += end - start + 1;
367 zholes_size[ZONE_DMA] += dma_pfn - start + 1;
368 zholes_size[ZONE_NORMAL] += end - dma_pfn;
372 static int __init early_parse_mem(char *p)
374 memory_end = memparse(p, &p);
377 early_param("mem", early_parse_mem);
380 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
382 static int __init early_parse_ipldelay(char *p)
384 unsigned long delay = 0;
386 delay = simple_strtoul(p, &p, 0);
395 delay *= 60 * 1000000;
398 /* now wait for the requested amount of time */
403 early_param("ipldelay", early_parse_ipldelay);
412 * Setup lowcore for boot cpu
414 lc_pages = sizeof(void *) == 8 ? 2 : 1;
415 lc = (struct _lowcore *)
416 __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
417 memset(lc, 0, lc_pages * PAGE_SIZE);
418 lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
419 lc->restart_psw.addr =
420 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
421 lc->external_new_psw.mask = PSW_KERNEL_BITS;
422 lc->external_new_psw.addr =
423 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
424 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
425 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
426 lc->program_new_psw.mask = PSW_KERNEL_BITS;
427 lc->program_new_psw.addr =
428 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
429 lc->mcck_new_psw.mask =
430 PSW_KERNEL_BITS & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
431 lc->mcck_new_psw.addr =
432 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
433 lc->io_new_psw.mask = PSW_KERNEL_BITS;
434 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
435 lc->ipl_device = S390_lowcore.ipl_device;
436 lc->jiffy_timer = -1LL;
437 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
438 lc->async_stack = (unsigned long)
439 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
440 lc->panic_stack = (unsigned long)
441 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
442 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
443 lc->thread_info = (unsigned long) &init_thread_union;
445 if (MACHINE_HAS_IEEE) {
446 lc->extended_save_area_addr = (__u32)
447 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
448 /* enable extended save area */
449 __ctl_set_bit(14, 29);
452 set_prefix((u32)(unsigned long) lc);
456 setup_resources(void)
458 struct resource *res;
461 code_resource.start = (unsigned long) &_text;
462 code_resource.end = (unsigned long) &_etext - 1;
463 data_resource.start = (unsigned long) &_etext;
464 data_resource.end = (unsigned long) &_edata - 1;
466 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
467 res = alloc_bootmem_low(sizeof(struct resource));
468 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
469 switch (memory_chunk[i].type) {
470 case CHUNK_READ_WRITE:
471 res->name = "System RAM";
473 case CHUNK_READ_ONLY:
474 res->name = "System ROM";
475 res->flags |= IORESOURCE_READONLY;
478 res->name = "reserved";
480 res->start = memory_chunk[i].addr;
481 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
482 request_resource(&iomem_resource, res);
483 request_resource(res, &code_resource);
484 request_resource(res, &data_resource);
488 static void __init setup_memory_end(void)
490 unsigned long real_size, memory_size;
491 unsigned long max_mem, max_phys;
494 memory_size = real_size = 0;
495 max_phys = VMALLOC_END - VMALLOC_MIN_SIZE;
496 memory_end &= PAGE_MASK;
498 max_mem = memory_end ? min(max_phys, memory_end) : max_phys;
500 for (i = 0; i < MEMORY_CHUNKS; i++) {
501 struct mem_chunk *chunk = &memory_chunk[i];
503 real_size = max(real_size, chunk->addr + chunk->size);
504 if (chunk->addr >= max_mem) {
505 memset(chunk, 0, sizeof(*chunk));
508 if (chunk->addr + chunk->size > max_mem)
509 chunk->size = max_mem - chunk->addr;
510 memory_size = max(memory_size, chunk->addr + chunk->size);
513 memory_end = memory_size;
514 if (real_size > memory_end)
515 printk("More memory detected than supported. Unused: %luk\n",
516 (real_size - memory_end) >> 10);
522 unsigned long bootmap_size;
523 unsigned long start_pfn, end_pfn, init_pfn;
524 unsigned long last_rw_end;
528 * partially used pages are not usable - thus
529 * we are rounding upwards:
531 start_pfn = PFN_UP(__pa(&_end));
532 end_pfn = max_pfn = PFN_DOWN(memory_end);
534 /* Initialize storage key for kernel pages */
535 for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
536 page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
538 #ifdef CONFIG_BLK_DEV_INITRD
540 * Move the initrd in case the bitmap of the bootmem allocater
541 * would overwrite it.
544 if (INITRD_START && INITRD_SIZE) {
545 unsigned long bmap_size;
548 bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
549 bmap_size = PFN_PHYS(bmap_size);
551 if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
552 start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
554 if (start + INITRD_SIZE > memory_end) {
555 printk("initrd extends beyond end of memory "
556 "(0x%08lx > 0x%08lx)\n"
557 "disabling initrd\n",
558 start + INITRD_SIZE, memory_end);
559 INITRD_START = INITRD_SIZE = 0;
561 printk("Moving initrd (0x%08lx -> 0x%08lx, "
563 INITRD_START, start, INITRD_SIZE);
564 memmove((void *) start, (void *) INITRD_START,
566 INITRD_START = start;
573 * Initialize the boot-time allocator
575 bootmap_size = init_bootmem(start_pfn, end_pfn);
578 * Register RAM areas with the bootmem allocator.
580 last_rw_end = start_pfn;
582 for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
583 unsigned long start_chunk, end_chunk;
585 if (memory_chunk[i].type != CHUNK_READ_WRITE)
587 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
588 start_chunk >>= PAGE_SHIFT;
589 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
590 end_chunk >>= PAGE_SHIFT;
591 if (start_chunk < start_pfn)
592 start_chunk = start_pfn;
593 if (end_chunk > end_pfn)
595 if (start_chunk < end_chunk) {
596 /* Initialize storage key for RAM pages */
597 for (init_pfn = start_chunk ; init_pfn < end_chunk;
599 page_set_storage_key(init_pfn << PAGE_SHIFT,
601 free_bootmem(start_chunk << PAGE_SHIFT,
602 (end_chunk - start_chunk) << PAGE_SHIFT);
603 if (last_rw_end < start_chunk)
604 add_memory_hole(last_rw_end, start_chunk - 1);
605 last_rw_end = end_chunk;
609 psw_set_key(PAGE_DEFAULT_KEY);
611 if (last_rw_end < end_pfn - 1)
612 add_memory_hole(last_rw_end, end_pfn - 1);
615 * Reserve the bootmem bitmap itself as well. We do this in two
616 * steps (first step was init_bootmem()) because this catches
617 * the (very unlikely) case of us accidentally initializing the
618 * bootmem allocator with an invalid RAM area.
620 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
622 #ifdef CONFIG_BLK_DEV_INITRD
623 if (INITRD_START && INITRD_SIZE) {
624 if (INITRD_START + INITRD_SIZE <= memory_end) {
625 reserve_bootmem(INITRD_START, INITRD_SIZE);
626 initrd_start = INITRD_START;
627 initrd_end = initrd_start + INITRD_SIZE;
629 printk("initrd extends beyond end of memory "
630 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
631 initrd_start + INITRD_SIZE, memory_end);
632 initrd_start = initrd_end = 0;
639 * Setup function called from init/main.c just after the banner
644 setup_arch(char **cmdline_p)
647 * print what head.S has found out about the machine
650 printk((MACHINE_IS_VM) ?
651 "We are running under VM (31 bit mode)\n" :
652 "We are running native (31 bit mode)\n");
653 printk((MACHINE_HAS_IEEE) ?
654 "This machine has an IEEE fpu\n" :
655 "This machine has no IEEE fpu\n");
656 #else /* CONFIG_64BIT */
657 printk((MACHINE_IS_VM) ?
658 "We are running under VM (64 bit mode)\n" :
659 "We are running native (64 bit mode)\n");
660 #endif /* CONFIG_64BIT */
662 /* Save unparsed command line copy for /proc/cmdline */
663 strlcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
665 *cmdline_p = COMMAND_LINE;
666 *(*cmdline_p + COMMAND_LINE_SIZE - 1) = '\0';
668 ROOT_DEV = Root_RAM0;
670 init_mm.start_code = PAGE_OFFSET;
671 init_mm.end_code = (unsigned long) &_etext;
672 init_mm.end_data = (unsigned long) &_edata;
673 init_mm.brk = (unsigned long) &_end;
675 if (MACHINE_HAS_MVCOS)
676 memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
678 memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
688 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
689 smp_setup_cpu_possible_map();
692 * Create kernel page tables and switch to virtual addressing.
696 /* Setup default console */
700 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
706 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
711 cpuinfo->cpu_id.version,
712 cpuinfo->cpu_id.ident,
713 cpuinfo->cpu_id.machine,
714 cpuinfo->cpu_id.unused);
718 * show_cpuinfo - Get information on one CPU for use by procfs.
721 static int show_cpuinfo(struct seq_file *m, void *v)
723 struct cpuinfo_S390 *cpuinfo;
724 unsigned long n = (unsigned long) v - 1;
728 seq_printf(m, "vendor_id : IBM/S390\n"
729 "# processors : %i\n"
730 "bogomips per cpu: %lu.%02lu\n",
731 num_online_cpus(), loops_per_jiffy/(500000/HZ),
732 (loops_per_jiffy/(5000/HZ))%100);
736 if (smp_processor_id() == n)
737 cpuinfo = &S390_lowcore.cpu_data;
739 cpuinfo = &lowcore_ptr[n]->cpu_data;
741 cpuinfo = &S390_lowcore.cpu_data;
743 seq_printf(m, "processor %li: "
745 "identification = %06X, "
747 n, cpuinfo->cpu_id.version,
748 cpuinfo->cpu_id.ident,
749 cpuinfo->cpu_id.machine);
755 static void *c_start(struct seq_file *m, loff_t *pos)
757 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
759 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
762 return c_start(m, pos);
764 static void c_stop(struct seq_file *m, void *v)
767 struct seq_operations cpuinfo_op = {
771 .show = show_cpuinfo,