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1 /*
2  *  arch/s390/kernel/setup.c
3  *
4  *  S390 version
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)
8  *
9  *  Derived from "arch/i386/kernel/setup.c"
10  *    Copyright (C) 1995, Linus Torvalds
11  */
12
13 /*
14  * This file handles the architecture-dependent parts of initialization
15  */
16
17 #include <linux/errno.h>
18 #include <linux/module.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.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>
39
40 #include <asm/uaccess.h>
41 #include <asm/system.h>
42 #include <asm/smp.h>
43 #include <asm/mmu_context.h>
44 #include <asm/cpcmd.h>
45 #include <asm/lowcore.h>
46 #include <asm/irq.h>
47
48 /*
49  * Machine setup..
50  */
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;
57 struct {
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 */
63
64 /*
65  * Setup options
66  */
67 extern int _text,_etext, _edata, _end;
68
69 /*
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 ...
73  */
74
75 #include <asm/setup.h>
76
77 static char command_line[COMMAND_LINE_SIZE] = { 0, };
78
79 static struct resource code_resource = {
80         .name  = "Kernel code",
81         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
82 };
83
84 static struct resource data_resource = {
85         .name = "Kernel data",
86         .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
87 };
88
89 /*
90  * cpu_init() initializes state that is per-CPU.
91  */
92 void __devinit cpu_init (void)
93 {
94         int addr = hard_smp_processor_id();
95
96         /*
97          * Store processor id in lowcore (used e.g. in timer_interrupt)
98          */
99         asm volatile ("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
100         S390_lowcore.cpu_data.cpu_addr = addr;
101
102         /*
103          * Force FPU initialization:
104          */
105         clear_thread_flag(TIF_USEDFPU);
106         clear_used_math();
107
108         atomic_inc(&init_mm.mm_count);
109         current->active_mm = &init_mm;
110         if (current->mm)
111                 BUG();
112         enter_lazy_tlb(&init_mm, current);
113 }
114
115 /*
116  * VM halt and poweroff setup routines
117  */
118 char vmhalt_cmd[128] = "";
119 char vmpoff_cmd[128] = "";
120
121 static inline void strncpy_skip_quote(char *dst, char *src, int n)
122 {
123         int sx, dx;
124
125         dx = 0;
126         for (sx = 0; src[sx] != 0; sx++) {
127                 if (src[sx] == '"') continue;
128                 dst[dx++] = src[sx];
129                 if (dx >= n) break;
130         }
131 }
132
133 static int __init vmhalt_setup(char *str)
134 {
135         strncpy_skip_quote(vmhalt_cmd, str, 127);
136         vmhalt_cmd[127] = 0;
137         return 1;
138 }
139
140 __setup("vmhalt=", vmhalt_setup);
141
142 static int __init vmpoff_setup(char *str)
143 {
144         strncpy_skip_quote(vmpoff_cmd, str, 127);
145         vmpoff_cmd[127] = 0;
146         return 1;
147 }
148
149 __setup("vmpoff=", vmpoff_setup);
150
151 /*
152  * condev= and conmode= setup parameter.
153  */
154
155 static int __init condev_setup(char *str)
156 {
157         int vdev;
158
159         vdev = simple_strtoul(str, &str, 0);
160         if (vdev >= 0 && vdev < 65536) {
161                 console_devno = vdev;
162                 console_irq = -1;
163         }
164         return 1;
165 }
166
167 __setup("condev=", condev_setup);
168
169 static int __init conmode_setup(char *str)
170 {
171 #if defined(CONFIG_SCLP_CONSOLE)
172         if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
173                 SET_CONSOLE_SCLP;
174 #endif
175 #if defined(CONFIG_TN3215_CONSOLE)
176         if (strncmp(str, "3215", 5) == 0)
177                 SET_CONSOLE_3215;
178 #endif
179 #if defined(CONFIG_TN3270_CONSOLE)
180         if (strncmp(str, "3270", 5) == 0)
181                 SET_CONSOLE_3270;
182 #endif
183         return 1;
184 }
185
186 __setup("conmode=", conmode_setup);
187
188 static void __init conmode_default(void)
189 {
190         char query_buffer[1024];
191         char *ptr;
192
193         if (MACHINE_IS_VM) {
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");
200                 /*
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).
206                  */
207                 __cpcmd("TERM CONMODE 3215", NULL, 0);
208                 if (ptr == NULL) {
209 #if defined(CONFIG_SCLP_CONSOLE)
210                         SET_CONSOLE_SCLP;
211 #endif
212                         return;
213                 }
214                 if (strncmp(ptr + 8, "3270", 4) == 0) {
215 #if defined(CONFIG_TN3270_CONSOLE)
216                         SET_CONSOLE_3270;
217 #elif defined(CONFIG_TN3215_CONSOLE)
218                         SET_CONSOLE_3215;
219 #elif defined(CONFIG_SCLP_CONSOLE)
220                         SET_CONSOLE_SCLP;
221 #endif
222                 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
223 #if defined(CONFIG_TN3215_CONSOLE)
224                         SET_CONSOLE_3215;
225 #elif defined(CONFIG_TN3270_CONSOLE)
226                         SET_CONSOLE_3270;
227 #elif defined(CONFIG_SCLP_CONSOLE)
228                         SET_CONSOLE_SCLP;
229 #endif
230                 }
231         } else if (MACHINE_IS_P390) {
232 #if defined(CONFIG_TN3215_CONSOLE)
233                 SET_CONSOLE_3215;
234 #elif defined(CONFIG_TN3270_CONSOLE)
235                 SET_CONSOLE_3270;
236 #endif
237         } else {
238 #if defined(CONFIG_SCLP_CONSOLE)
239                 SET_CONSOLE_SCLP;
240 #endif
241         }
242 }
243
244 #ifdef CONFIG_SMP
245 extern void machine_restart_smp(char *);
246 extern void machine_halt_smp(void);
247 extern void machine_power_off_smp(void);
248
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;
252 #else
253 /*
254  * Reboot, halt and power_off routines for non SMP.
255  */
256 extern void reipl(unsigned long devno);
257 static void do_machine_restart_nonsmp(char * __unused)
258 {
259         if (MACHINE_IS_VM)
260                 cpcmd ("IPL", NULL, 0);
261         else
262                 reipl (0x10000 | S390_lowcore.ipl_device);
263 }
264
265 static void do_machine_halt_nonsmp(void)
266 {
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);
270 }
271
272 static void do_machine_power_off_nonsmp(void)
273 {
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);
277 }
278
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;
282 #endif
283
284  /*
285  * Reboot, halt and power_off stubs. They just call _machine_restart,
286  * _machine_halt or _machine_power_off. 
287  */
288
289 void machine_restart(char *command)
290 {
291         console_unblank();
292         _machine_restart(command);
293 }
294
295 EXPORT_SYMBOL(machine_restart);
296
297 void machine_halt(void)
298 {
299         console_unblank();
300         _machine_halt();
301 }
302
303 EXPORT_SYMBOL(machine_halt);
304
305 void machine_power_off(void)
306 {
307         console_unblank();
308         _machine_power_off();
309 }
310
311 EXPORT_SYMBOL(machine_power_off);
312
313 /*
314  * Setup function called from init/main.c just after the banner
315  * was printed.
316  */
317 extern char _pstart, _pend, _stext;
318
319 void __init setup_arch(char **cmdline_p)
320 {
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;
327         struct _lowcore *lc;
328         int i;
329
330         if (smptrap)
331                 return;
332         smptrap=1;
333
334         /*
335          * print what head.S has found out about the machine 
336          */
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 */
349
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 */
354         /*
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.
358          */
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;
368
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;
373
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';
377
378         for (;;) {
379                 /*
380                  * "mem=XXX[kKmM]" sets memsize 
381                  */
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;
386                                 from++;
387                         } else if ( *from == 'M' || *from == 'm' ) {
388                                 memory_end = memory_end << 20;
389                                 from++;
390                         }
391                 }
392                 /*
393                  * "ipldelay=XXX[sm]" sets ipl delay in seconds or minutes
394                  */
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;
399                                 from++;
400                         } else if (*from == 'm' || *from == 'M') {
401                                 delay = delay*60*1000000;
402                                 from++;
403                         }
404                         /* now wait for the requested amount of time */
405                         udelay(delay);
406                 }
407                 cn = *(from++);
408                 if (!cn)
409                         break;
410                 if (cn == '\n')
411                         cn = ' ';  /* replace newlines with space */
412                 if (cn == 0x0d)
413                         cn = ' ';  /* replace 0x0d with space */
414                 if (cn == ' ' && c == ' ')
415                         continue;  /* remove additional spaces */
416                 c = cn;
417                 if (to - command_line >= COMMAND_LINE_SIZE)
418                         break;
419                 *(to++) = c;
420         }
421         if (c == ' ' && to > command_line) to--;
422         *to = '\0';
423         *cmdline_p = command_line;
424
425         /*
426          * partially used pages are not usable - thus
427          * we are rounding upwards:
428          */
429         start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
430         end_pfn = max_pfn = memory_end >> PAGE_SHIFT;
431
432         /*
433          * Initialize the boot-time allocator (with low memory only):
434          */
435         bootmap_size = init_bootmem(start_pfn, end_pfn);
436
437         /*
438          * Register RAM areas with the bootmem allocator.
439          */
440         for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
441                 unsigned long start_chunk, end_chunk;
442
443                 if (memory_chunk[i].type != CHUNK_READ_WRITE)
444                         continue;
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)
452                         end_chunk = end_pfn;
453                 if (start_chunk < end_chunk)
454                         free_bootmem(start_chunk << PAGE_SHIFT,
455                                      (end_chunk - start_chunk) << PAGE_SHIFT);
456         }
457
458         /*
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.
463          */
464         reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);
465
466 #ifdef CONFIG_BLK_DEV_INITRD
467         if (INITRD_START) {
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;
472                 } else {
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;
477                 }
478         }
479 #endif
480
481         for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
482                 struct resource *res;
483
484                 res = alloc_bootmem_low(sizeof(struct resource));
485                 res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
486
487                 switch (memory_chunk[i].type) {
488                 case CHUNK_READ_WRITE:
489                         res->name = "System RAM";
490                         break;
491                 case CHUNK_READ_ONLY:
492                         res->name = "System ROM";
493                         res->flags |= IORESOURCE_READONLY;
494                         break;
495                 default:
496                         res->name = "reserved";
497                 }
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);
503         }
504
505         /*
506          * Setup lowcore for boot cpu
507          */
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;
539 #endif
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;
545         else
546                 lc->diag44_opcode = 0x07000700;
547 #endif /* CONFIG_ARCH_S390X */
548         set_prefix((u32)(unsigned long) lc);
549         cpu_init();
550         __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
551
552         /*
553          * Create kernel page tables and switch to virtual addressing.
554          */
555         paging_init();
556
557         /* Setup default console */
558         conmode_default();
559 }
560
561 void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
562 {
563    printk("cpu %d "
564 #ifdef CONFIG_SMP
565            "phys_idx=%d "
566 #endif
567            "vers=%02X ident=%06X machine=%04X unused=%04X\n",
568            cpuinfo->cpu_nr,
569 #ifdef CONFIG_SMP
570            cpuinfo->cpu_addr,
571 #endif
572            cpuinfo->cpu_id.version,
573            cpuinfo->cpu_id.ident,
574            cpuinfo->cpu_id.machine,
575            cpuinfo->cpu_id.unused);
576 }
577
578 /*
579  * show_cpuinfo - Get information on one CPU for use by procfs.
580  */
581
582 static int show_cpuinfo(struct seq_file *m, void *v)
583 {
584         struct cpuinfo_S390 *cpuinfo;
585         unsigned long n = (unsigned long) v - 1;
586
587         if (!n) {
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);
593         }
594         if (cpu_online(n)) {
595 #ifdef CONFIG_SMP
596                 if (smp_processor_id() == n)
597                         cpuinfo = &S390_lowcore.cpu_data;
598                 else
599                         cpuinfo = &lowcore_ptr[n]->cpu_data;
600 #else
601                 cpuinfo = &S390_lowcore.cpu_data;
602 #endif
603                 seq_printf(m, "processor %li: "
604                                "version = %02X,  "
605                                "identification = %06X,  "
606                                "machine = %04X\n",
607                                n, cpuinfo->cpu_id.version,
608                                cpuinfo->cpu_id.ident,
609                                cpuinfo->cpu_id.machine);
610         }
611         return 0;
612 }
613
614 static void *c_start(struct seq_file *m, loff_t *pos)
615 {
616         return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
617 }
618 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
619 {
620         ++*pos;
621         return c_start(m, pos);
622 }
623 static void c_stop(struct seq_file *m, void *v)
624 {
625 }
626 struct seq_operations cpuinfo_op = {
627         .start  = c_start,
628         .next   = c_next,
629         .stop   = c_stop,
630         .show   = show_cpuinfo,
631 };
632