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/config.h>
32 #include <linux/init.h>
33 #include <linux/initrd.h>
34 #include <linux/bootmem.h>
35 #include <linux/root_dev.h>
36 #include <linux/console.h>
37 #include <linux/seq_file.h>
38 #include <linux/kernel_stat.h>
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
43 #include <asm/mmu_context.h>
44 #include <asm/cpcmd.h>
45 #include <asm/lowcore.h>
51 unsigned int console_mode = 0;
52 unsigned int console_devno = -1;
53 unsigned int console_irq = -1;
54 unsigned long memory_size = 0;
55 unsigned long machine_flags = 0;
56 unsigned int default_storage_key = 0;
58 unsigned long addr, size, type;
59 } memory_chunk[MEMORY_CHUNKS] = { { 0 } };
60 #define CHUNK_READ_WRITE 0
61 #define CHUNK_READ_ONLY 1
62 volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
67 extern int _text,_etext, _edata, _end;
70 * This is set up by the setup-routine at boot-time
71 * for S390 need to find out, what we have to setup
72 * using address 0x10400 ...
75 #include <asm/setup.h>
77 static char command_line[COMMAND_LINE_SIZE] = { 0, };
79 static struct resource code_resource = {
80 .name = "Kernel code",
81 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
84 static struct resource data_resource = {
85 .name = "Kernel data",
86 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
90 * cpu_init() initializes state that is per-CPU.
92 void __devinit cpu_init (void)
94 int addr = hard_smp_processor_id();
97 * Store processor id in lowcore (used e.g. in timer_interrupt)
99 asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
100 S390_lowcore.cpu_data.cpu_addr = addr;
103 * Force FPU initialization:
105 clear_thread_flag(TIF_USEDFPU);
108 atomic_inc(&init_mm.mm_count);
109 current->active_mm = &init_mm;
112 enter_lazy_tlb(&init_mm, current);
116 * VM halt and poweroff setup routines
118 char vmhalt_cmd[128] = "";
119 char vmpoff_cmd[128] = "";
121 static inline void strncpy_skip_quote(char *dst, char *src, int n)
126 for (sx = 0; src[sx] != 0; sx++) {
127 if (src[sx] == '"') continue;
133 static int __init vmhalt_setup(char *str)
135 strncpy_skip_quote(vmhalt_cmd, str, 127);
140 __setup("vmhalt=", vmhalt_setup);
142 static int __init vmpoff_setup(char *str)
144 strncpy_skip_quote(vmpoff_cmd, str, 127);
149 __setup("vmpoff=", vmpoff_setup);
152 * condev= and conmode= setup parameter.
155 static int __init condev_setup(char *str)
159 vdev = simple_strtoul(str, &str, 0);
160 if (vdev >= 0 && vdev < 65536) {
161 console_devno = vdev;
167 __setup("condev=", condev_setup);
169 static int __init conmode_setup(char *str)
171 #if defined(CONFIG_SCLP_CONSOLE)
172 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
175 #if defined(CONFIG_TN3215_CONSOLE)
176 if (strncmp(str, "3215", 5) == 0)
179 #if defined(CONFIG_TN3270_CONSOLE)
180 if (strncmp(str, "3270", 5) == 0)
186 __setup("conmode=", conmode_setup);
188 static void __init conmode_default(void)
190 char query_buffer[1024];
194 __cpcmd("QUERY CONSOLE", query_buffer, 1024);
195 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
196 ptr = strstr(query_buffer, "SUBCHANNEL =");
197 console_irq = simple_strtoul(ptr + 13, NULL, 16);
198 __cpcmd("QUERY TERM", query_buffer, 1024);
199 ptr = strstr(query_buffer, "CONMODE");
201 * Set the conmode to 3215 so that the device recognition
202 * will set the cu_type of the console to 3215. If the
203 * conmode is 3270 and we don't set it back then both
204 * 3215 and the 3270 driver will try to access the console
205 * device (3215 as console and 3270 as normal tty).
207 __cpcmd("TERM CONMODE 3215", NULL, 0);
209 #if defined(CONFIG_SCLP_CONSOLE)
214 if (strncmp(ptr + 8, "3270", 4) == 0) {
215 #if defined(CONFIG_TN3270_CONSOLE)
217 #elif defined(CONFIG_TN3215_CONSOLE)
219 #elif defined(CONFIG_SCLP_CONSOLE)
222 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
223 #if defined(CONFIG_TN3215_CONSOLE)
225 #elif defined(CONFIG_TN3270_CONSOLE)
227 #elif defined(CONFIG_SCLP_CONSOLE)
231 } else if (MACHINE_IS_P390) {
232 #if defined(CONFIG_TN3215_CONSOLE)
234 #elif defined(CONFIG_TN3270_CONSOLE)
238 #if defined(CONFIG_SCLP_CONSOLE)
245 extern void machine_restart_smp(char *);
246 extern void machine_halt_smp(void);
247 extern void machine_power_off_smp(void);
249 void (*_machine_restart)(char *command) = machine_restart_smp;
250 void (*_machine_halt)(void) = machine_halt_smp;
251 void (*_machine_power_off)(void) = machine_power_off_smp;
254 * Reboot, halt and power_off routines for non SMP.
256 extern void reipl(unsigned long devno);
257 static void do_machine_restart_nonsmp(char * __unused)
260 cpcmd ("IPL", NULL, 0);
262 reipl (0x10000 | S390_lowcore.ipl_device);
265 static void do_machine_halt_nonsmp(void)
267 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
268 cpcmd(vmhalt_cmd, NULL, 0);
269 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
272 static void do_machine_power_off_nonsmp(void)
274 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
275 cpcmd(vmpoff_cmd, NULL, 0);
276 signal_processor(smp_processor_id(), sigp_stop_and_store_status);
279 void (*_machine_restart)(char *command) = do_machine_restart_nonsmp;
280 void (*_machine_halt)(void) = do_machine_halt_nonsmp;
281 void (*_machine_power_off)(void) = do_machine_power_off_nonsmp;
285 * Reboot, halt and power_off stubs. They just call _machine_restart,
286 * _machine_halt or _machine_power_off.
289 void machine_restart(char *command)
292 _machine_restart(command);
295 EXPORT_SYMBOL(machine_restart);
297 void machine_halt(void)
303 EXPORT_SYMBOL(machine_halt);
305 void machine_power_off(void)
308 _machine_power_off();
311 EXPORT_SYMBOL(machine_power_off);
314 * Setup function called from init/main.c just after the banner
317 extern char _pstart, _pend, _stext;
319 void __init setup_arch(char **cmdline_p)
321 unsigned long bootmap_size;
322 unsigned long memory_start, memory_end;
323 char c = ' ', cn, *to = command_line, *from = COMMAND_LINE;
324 unsigned long start_pfn, end_pfn;
325 static unsigned int smptrap=0;
326 unsigned long delay = 0;
335 * print what head.S has found out about the machine
337 #ifndef CONFIG_ARCH_S390X
338 printk((MACHINE_IS_VM) ?
339 "We are running under VM (31 bit mode)\n" :
340 "We are running native (31 bit mode)\n");
341 printk((MACHINE_HAS_IEEE) ?
342 "This machine has an IEEE fpu\n" :
343 "This machine has no IEEE fpu\n");
344 #else /* CONFIG_ARCH_S390X */
345 printk((MACHINE_IS_VM) ?
346 "We are running under VM (64 bit mode)\n" :
347 "We are running native (64 bit mode)\n");
348 #endif /* CONFIG_ARCH_S390X */
350 ROOT_DEV = Root_RAM0;
351 memory_start = (unsigned long) &_end; /* fixit if use $CODELO etc*/
352 #ifndef CONFIG_ARCH_S390X
353 memory_end = memory_size & ~0x400000UL; /* align memory end to 4MB */
355 * We need some free virtual space to be able to do vmalloc.
356 * On a machine with 2GB memory we make sure that we have at
357 * least 128 MB free space for vmalloc.
359 if (memory_end > 1920*1024*1024)
360 memory_end = 1920*1024*1024;
361 #else /* CONFIG_ARCH_S390X */
362 memory_end = memory_size & ~0x200000UL; /* detected in head.s */
363 #endif /* CONFIG_ARCH_S390X */
364 init_mm.start_code = PAGE_OFFSET;
365 init_mm.end_code = (unsigned long) &_etext;
366 init_mm.end_data = (unsigned long) &_edata;
367 init_mm.brk = (unsigned long) &_end;
369 code_resource.start = (unsigned long) &_text;
370 code_resource.end = (unsigned long) &_etext - 1;
371 data_resource.start = (unsigned long) &_etext;
372 data_resource.end = (unsigned long) &_edata - 1;
374 /* Save unparsed command line copy for /proc/cmdline */
375 memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
376 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
380 * "mem=XXX[kKmM]" sets memsize
382 if (c == ' ' && strncmp(from, "mem=", 4) == 0) {
383 memory_end = simple_strtoul(from+4, &from, 0);
384 if ( *from == 'K' || *from == 'k' ) {
385 memory_end = memory_end << 10;
387 } else if ( *from == 'M' || *from == 'm' ) {
388 memory_end = memory_end << 20;
393 * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
395 if (c == ' ' && strncmp(from, "ipldelay=", 9) == 0) {
396 delay = simple_strtoul(from+9, &from, 0);
397 if (*from == 's' || *from == 'S') {
398 delay = delay*1000000;
400 } else if (*from == 'm' || *from == 'M') {
401 delay = delay*60*1000000;
404 /* now wait for the requested amount of time */
411 cn = ' '; /* replace newlines with space */
413 cn = ' '; /* replace 0x0d with space */
414 if (cn == ' ' && c == ' ')
415 continue; /* remove additional spaces */
417 if (to - command_line >= COMMAND_LINE_SIZE)
421 if (c == ' ' && to > command_line) to--;
423 *cmdline_p = command_line;
426 * partially used pages are not usable - thus
427 * we are rounding upwards:
429 start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
430 end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
433 * Initialize the boot-time allocator (with low memory only):
435 bootmap_size = init_bootmem(start_pfn, end_pfn);
438 * Register RAM areas with the bootmem allocator.
440 for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
441 unsigned long start_chunk, end_chunk;
443 if (memory_chunk[i].type != CHUNK_READ_WRITE)
445 start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
446 start_chunk >>= PAGE_SHIFT;
447 end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
448 end_chunk >>= PAGE_SHIFT;
449 if (start_chunk < start_pfn)
450 start_chunk = start_pfn;
451 if (end_chunk > end_pfn)
453 if (start_chunk < end_chunk)
454 free_bootmem(start_chunk << PAGE_SHIFT,
455 (end_chunk - start_chunk) << PAGE_SHIFT);
459 * Reserve the bootmem bitmap itself as well. We do this in two
460 * steps (first step was init_bootmem()) because this catches
461 * the (very unlikely) case of us accidentally initializing the
462 * bootmem allocator with an invalid RAM area.
464 reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
466 #ifdef CONFIG_BLK_DEV_INITRD
468 if (INITRD_START + INITRD_SIZE <= memory_end) {
469 reserve_bootmem(INITRD_START, INITRD_SIZE);
470 initrd_start = INITRD_START;
471 initrd_end = initrd_start + INITRD_SIZE;
473 printk("initrd extends beyond end of memory "
474 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
475 initrd_start + INITRD_SIZE, memory_end);
476 initrd_start = initrd_end = 0;
481 for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
482 struct resource *res;
484 res = alloc_bootmem_low(sizeof(struct resource));
485 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
487 switch (memory_chunk[i].type) {
488 case CHUNK_READ_WRITE:
489 res->name = "System RAM";
491 case CHUNK_READ_ONLY:
492 res->name = "System ROM";
493 res->flags |= IORESOURCE_READONLY;
496 res->name = "reserved";
498 res->start = memory_chunk[i].addr;
499 res->end = memory_chunk[i].addr + memory_chunk[i].size - 1;
500 request_resource(&iomem_resource, res);
501 request_resource(res, &code_resource);
502 request_resource(res, &data_resource);
506 * Setup lowcore for boot cpu
508 #ifndef CONFIG_ARCH_S390X
509 lc = (struct _lowcore *) __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
510 memset(lc, 0, PAGE_SIZE);
511 #else /* CONFIG_ARCH_S390X */
512 lc = (struct _lowcore *) __alloc_bootmem(2*PAGE_SIZE, 2*PAGE_SIZE, 0);
513 memset(lc, 0, 2*PAGE_SIZE);
514 #endif /* CONFIG_ARCH_S390X */
515 lc->restart_psw.mask = PSW_BASE_BITS;
516 lc->restart_psw.addr =
517 PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
518 lc->external_new_psw.mask = PSW_KERNEL_BITS;
519 lc->external_new_psw.addr =
520 PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
521 lc->svc_new_psw.mask = PSW_KERNEL_BITS | PSW_MASK_IO | PSW_MASK_EXT;
522 lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
523 lc->program_new_psw.mask = PSW_KERNEL_BITS;
524 lc->program_new_psw.addr =
525 PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
526 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
527 lc->mcck_new_psw.addr =
528 PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
529 lc->io_new_psw.mask = PSW_KERNEL_BITS;
530 lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
531 lc->ipl_device = S390_lowcore.ipl_device;
532 lc->jiffy_timer = -1LL;
533 lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
534 lc->async_stack = (unsigned long)
535 __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
536 #ifdef CONFIG_CHECK_STACK
537 lc->panic_stack = (unsigned long)
538 __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
540 lc->current_task = (unsigned long) init_thread_union.thread_info.task;
541 lc->thread_info = (unsigned long) &init_thread_union;
542 #ifdef CONFIG_ARCH_S390X
543 if (MACHINE_HAS_DIAG44)
544 lc->diag44_opcode = 0x83000044;
546 lc->diag44_opcode = 0x07000700;
547 #endif /* CONFIG_ARCH_S390X */
548 set_prefix((u32)(unsigned long) lc);
550 __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
553 * Create kernel page tables and switch to virtual addressing.
557 /* Setup default console */
561 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
567 "vers=%02X ident=%06X machine=%04X unused=%04X\n",
572 cpuinfo->cpu_id.version,
573 cpuinfo->cpu_id.ident,
574 cpuinfo->cpu_id.machine,
575 cpuinfo->cpu_id.unused);
579 * show_cpuinfo - Get information on one CPU for use by procfs.
582 static int show_cpuinfo(struct seq_file *m, void *v)
584 struct cpuinfo_S390 *cpuinfo;
585 unsigned long n = (unsigned long) v - 1;
588 seq_printf(m, "vendor_id : IBM/S390\n"
589 "# processors : %i\n"
590 "bogomips per cpu: %lu.%02lu\n",
591 num_online_cpus(), loops_per_jiffy/(500000/HZ),
592 (loops_per_jiffy/(5000/HZ))%100);
596 if (smp_processor_id() == n)
597 cpuinfo = &S390_lowcore.cpu_data;
599 cpuinfo = &lowcore_ptr[n]->cpu_data;
601 cpuinfo = &S390_lowcore.cpu_data;
603 seq_printf(m, "processor %li: "
605 "identification = %06X, "
607 n, cpuinfo->cpu_id.version,
608 cpuinfo->cpu_id.ident,
609 cpuinfo->cpu_id.machine);
614 static void *c_start(struct seq_file *m, loff_t *pos)
616 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
618 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
621 return c_start(m, pos);
623 static void c_stop(struct seq_file *m, void *v)
626 struct seq_operations cpuinfo_op = {
630 .show = show_cpuinfo,