Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
[linux-2.6] / arch / sparc64 / kernel / setup.c
1 /*  $Id: setup.c,v 1.72 2002/02/09 19:49:30 davem Exp $
2  *  linux/arch/sparc64/kernel/setup.c
3  *
4  *  Copyright (C) 1995,1996  David S. Miller (davem@caip.rutgers.edu)
5  *  Copyright (C) 1997       Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  */
7
8 #include <linux/errno.h>
9 #include <linux/sched.h>
10 #include <linux/kernel.h>
11 #include <linux/mm.h>
12 #include <linux/stddef.h>
13 #include <linux/unistd.h>
14 #include <linux/ptrace.h>
15 #include <linux/slab.h>
16 #include <asm/smp.h>
17 #include <linux/user.h>
18 #include <linux/a.out.h>
19 #include <linux/tty.h>
20 #include <linux/delay.h>
21 #include <linux/config.h>
22 #include <linux/fs.h>
23 #include <linux/seq_file.h>
24 #include <linux/syscalls.h>
25 #include <linux/kdev_t.h>
26 #include <linux/major.h>
27 #include <linux/string.h>
28 #include <linux/init.h>
29 #include <linux/inet.h>
30 #include <linux/console.h>
31 #include <linux/root_dev.h>
32 #include <linux/interrupt.h>
33 #include <linux/cpu.h>
34 #include <linux/initrd.h>
35
36 #include <asm/system.h>
37 #include <asm/io.h>
38 #include <asm/processor.h>
39 #include <asm/oplib.h>
40 #include <asm/page.h>
41 #include <asm/pgtable.h>
42 #include <asm/idprom.h>
43 #include <asm/head.h>
44 #include <asm/starfire.h>
45 #include <asm/mmu_context.h>
46 #include <asm/timer.h>
47 #include <asm/sections.h>
48 #include <asm/setup.h>
49 #include <asm/mmu.h>
50
51 #ifdef CONFIG_IP_PNP
52 #include <net/ipconfig.h>
53 #endif
54
55 struct screen_info screen_info = {
56         0, 0,                   /* orig-x, orig-y */
57         0,                      /* unused */
58         0,                      /* orig-video-page */
59         0,                      /* orig-video-mode */
60         128,                    /* orig-video-cols */
61         0, 0, 0,                /* unused, ega_bx, unused */
62         54,                     /* orig-video-lines */
63         0,                      /* orig-video-isVGA */
64         16                      /* orig-video-points */
65 };
66
67 /* Typing sync at the prom prompt calls the function pointed to by
68  * the sync callback which I set to the following function.
69  * This should sync all filesystems and return, for now it just
70  * prints out pretty messages and returns.
71  */
72
73 void (*prom_palette)(int);
74 void (*prom_keyboard)(void);
75
76 static void
77 prom_console_write(struct console *con, const char *s, unsigned n)
78 {
79         prom_write(s, n);
80 }
81
82 static struct console prom_console = {
83         .name =         "prom",
84         .write =        prom_console_write,
85         .flags =        CON_CONSDEV | CON_ENABLED,
86         .index =        -1,
87 };
88
89 #define PROM_TRUE       -1
90 #define PROM_FALSE      0
91
92 /* Pretty sick eh? */
93 int prom_callback(long *args)
94 {
95         struct console *cons, *saved_console = NULL;
96         unsigned long flags;
97         char *cmd;
98         extern spinlock_t prom_entry_lock;
99
100         if (!args)
101                 return -1;
102         if (!(cmd = (char *)args[0]))
103                 return -1;
104
105         /*
106          * The callback can be invoked on the cpu that first dropped 
107          * into prom_cmdline after taking the serial interrupt, or on 
108          * a slave processor that was smp_captured() if the 
109          * administrator has done a switch-cpu inside obp. In either 
110          * case, the cpu is marked as in-interrupt. Drop IRQ locks.
111          */
112         irq_exit();
113
114         /* XXX Revisit the locking here someday.  This is a debugging
115          * XXX feature so it isnt all that critical.  -DaveM
116          */
117         local_irq_save(flags);
118
119         spin_unlock(&prom_entry_lock);
120         cons = console_drivers;
121         while (cons) {
122                 unregister_console(cons);
123                 cons->flags &= ~(CON_PRINTBUFFER);
124                 cons->next = saved_console;
125                 saved_console = cons;
126                 cons = console_drivers;
127         }
128         register_console(&prom_console);
129         if (!strcmp(cmd, "sync")) {
130                 prom_printf("PROM `%s' command...\n", cmd);
131                 show_free_areas();
132                 if (current->pid != 0) {
133                         local_irq_enable();
134                         sys_sync();
135                         local_irq_disable();
136                 }
137                 args[2] = 0;
138                 args[args[1] + 3] = -1;
139                 prom_printf("Returning to PROM\n");
140         } else if (!strcmp(cmd, "va>tte-data")) {
141                 unsigned long ctx, va;
142                 unsigned long tte = 0;
143                 long res = PROM_FALSE;
144
145                 ctx = args[3];
146                 va = args[4];
147                 if (ctx) {
148                         /*
149                          * Find process owning ctx, lookup mapping.
150                          */
151                         struct task_struct *p;
152                         struct mm_struct *mm = NULL;
153                         pgd_t *pgdp;
154                         pud_t *pudp;
155                         pmd_t *pmdp;
156                         pte_t *ptep;
157
158                         for_each_process(p) {
159                                 mm = p->mm;
160                                 if (CTX_NRBITS(mm->context) == ctx)
161                                         break;
162                         }
163                         if (!mm ||
164                             CTX_NRBITS(mm->context) != ctx)
165                                 goto done;
166
167                         pgdp = pgd_offset(mm, va);
168                         if (pgd_none(*pgdp))
169                                 goto done;
170                         pudp = pud_offset(pgdp, va);
171                         if (pud_none(*pudp))
172                                 goto done;
173                         pmdp = pmd_offset(pudp, va);
174                         if (pmd_none(*pmdp))
175                                 goto done;
176
177                         /* Preemption implicitly disabled by virtue of
178                          * being called from inside OBP.
179                          */
180                         ptep = pte_offset_map(pmdp, va);
181                         if (pte_present(*ptep)) {
182                                 tte = pte_val(*ptep);
183                                 res = PROM_TRUE;
184                         }
185                         pte_unmap(ptep);
186                         goto done;
187                 }
188
189                 if ((va >= KERNBASE) && (va < (KERNBASE + (4 * 1024 * 1024)))) {
190                         extern unsigned long sparc64_kern_pri_context;
191
192                         /* Spitfire Errata #32 workaround */
193                         __asm__ __volatile__("stxa      %0, [%1] %2\n\t"
194                                              "flush     %%g6"
195                                              : /* No outputs */
196                                              : "r" (sparc64_kern_pri_context),
197                                                "r" (PRIMARY_CONTEXT),
198                                                "i" (ASI_DMMU));
199
200                         /*
201                          * Locked down tlb entry.
202                          */
203
204                         if (tlb_type == spitfire)
205                                 tte = spitfire_get_dtlb_data(SPITFIRE_HIGHEST_LOCKED_TLBENT);
206                         else if (tlb_type == cheetah || tlb_type == cheetah_plus)
207                                 tte = cheetah_get_ldtlb_data(CHEETAH_HIGHEST_LOCKED_TLBENT);
208
209                         res = PROM_TRUE;
210                         goto done;
211                 }
212
213                 if (va < PGDIR_SIZE) {
214                         /*
215                          * vmalloc or prom_inherited mapping.
216                          */
217                         pgd_t *pgdp;
218                         pud_t *pudp;
219                         pmd_t *pmdp;
220                         pte_t *ptep;
221                         int error;
222
223                         if ((va >= LOW_OBP_ADDRESS) && (va < HI_OBP_ADDRESS)) {
224                                 tte = prom_virt_to_phys(va, &error);
225                                 if (!error)
226                                         res = PROM_TRUE;
227                                 goto done;
228                         }
229                         pgdp = pgd_offset_k(va);
230                         if (pgd_none(*pgdp))
231                                 goto done;
232                         pudp = pud_offset(pgdp, va);
233                         if (pud_none(*pudp))
234                                 goto done;
235                         pmdp = pmd_offset(pudp, va);
236                         if (pmd_none(*pmdp))
237                                 goto done;
238
239                         /* Preemption implicitly disabled by virtue of
240                          * being called from inside OBP.
241                          */
242                         ptep = pte_offset_kernel(pmdp, va);
243                         if (pte_present(*ptep)) {
244                                 tte = pte_val(*ptep);
245                                 res = PROM_TRUE;
246                         }
247                         goto done;
248                 }
249
250                 if (va < PAGE_OFFSET) {
251                         /*
252                          * No mappings here.
253                          */
254                         goto done;
255                 }
256
257                 if (va & (1UL << 40)) {
258                         /*
259                          * I/O page.
260                          */
261
262                         tte = (__pa(va) & _PAGE_PADDR) |
263                               _PAGE_VALID | _PAGE_SZ4MB |
264                               _PAGE_E | _PAGE_P | _PAGE_W;
265                         res = PROM_TRUE;
266                         goto done;
267                 }
268
269                 /*
270                  * Normal page.
271                  */
272                 tte = (__pa(va) & _PAGE_PADDR) |
273                       _PAGE_VALID | _PAGE_SZ4MB |
274                       _PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W;
275                 res = PROM_TRUE;
276
277         done:
278                 if (res == PROM_TRUE) {
279                         args[2] = 3;
280                         args[args[1] + 3] = 0;
281                         args[args[1] + 4] = res;
282                         args[args[1] + 5] = tte;
283                 } else {
284                         args[2] = 2;
285                         args[args[1] + 3] = 0;
286                         args[args[1] + 4] = res;
287                 }
288         } else if (!strcmp(cmd, ".soft1")) {
289                 unsigned long tte;
290
291                 tte = args[3];
292                 prom_printf("%lx:\"%s%s%s%s%s\" ",
293                             (tte & _PAGE_SOFT) >> 7,
294                             tte & _PAGE_MODIFIED ? "M" : "-",
295                             tte & _PAGE_ACCESSED ? "A" : "-",
296                             tte & _PAGE_READ     ? "W" : "-",
297                             tte & _PAGE_WRITE    ? "R" : "-",
298                             tte & _PAGE_PRESENT  ? "P" : "-");
299
300                 args[2] = 2;
301                 args[args[1] + 3] = 0;
302                 args[args[1] + 4] = PROM_TRUE;
303         } else if (!strcmp(cmd, ".soft2")) {
304                 unsigned long tte;
305
306                 tte = args[3];
307                 prom_printf("%lx ", (tte & 0x07FC000000000000UL) >> 50);
308
309                 args[2] = 2;
310                 args[args[1] + 3] = 0;
311                 args[args[1] + 4] = PROM_TRUE;
312         } else {
313                 prom_printf("unknown PROM `%s' command...\n", cmd);
314         }
315         unregister_console(&prom_console);
316         while (saved_console) {
317                 cons = saved_console;
318                 saved_console = cons->next;
319                 register_console(cons);
320         }
321         spin_lock(&prom_entry_lock);
322         local_irq_restore(flags);
323
324         /*
325          * Restore in-interrupt status for a resume from obp.
326          */
327         irq_enter();
328         return 0;
329 }
330
331 unsigned int boot_flags = 0;
332 #define BOOTME_DEBUG  0x1
333 #define BOOTME_SINGLE 0x2
334
335 /* Exported for mm/init.c:paging_init. */
336 unsigned long cmdline_memory_size = 0;
337
338 static struct console prom_debug_console = {
339         .name =         "debug",
340         .write =        prom_console_write,
341         .flags =        CON_PRINTBUFFER,
342         .index =        -1,
343 };
344
345 /* XXX Implement this at some point... */
346 void kernel_enter_debugger(void)
347 {
348 }
349
350 int obp_system_intr(void)
351 {
352         if (boot_flags & BOOTME_DEBUG) {
353                 printk("OBP: system interrupted\n");
354                 prom_halt();
355                 return 1;
356         }
357         return 0;
358 }
359
360 /* 
361  * Process kernel command line switches that are specific to the
362  * SPARC or that require special low-level processing.
363  */
364 static void __init process_switch(char c)
365 {
366         switch (c) {
367         case 'd':
368                 boot_flags |= BOOTME_DEBUG;
369                 break;
370         case 's':
371                 boot_flags |= BOOTME_SINGLE;
372                 break;
373         case 'h':
374                 prom_printf("boot_flags_init: Halt!\n");
375                 prom_halt();
376                 break;
377         case 'p':
378                 /* Use PROM debug console. */
379                 register_console(&prom_debug_console);
380                 break;
381         case 'P':
382                 /* Force UltraSPARC-III P-Cache on. */
383                 if (tlb_type != cheetah) {
384                         printk("BOOT: Ignoring P-Cache force option.\n");
385                         break;
386                 }
387                 cheetah_pcache_forced_on = 1;
388                 add_taint(TAINT_MACHINE_CHECK);
389                 cheetah_enable_pcache();
390                 break;
391
392         default:
393                 printk("Unknown boot switch (-%c)\n", c);
394                 break;
395         }
396 }
397
398 static void __init process_console(char *commands)
399 {
400         serial_console = 0;
401         commands += 8;
402         /* Linux-style serial */
403         if (!strncmp(commands, "ttyS", 4))
404                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
405         else if (!strncmp(commands, "tty", 3)) {
406                 char c = *(commands + 3);
407                 /* Solaris-style serial */
408                 if (c == 'a' || c == 'b') {
409                         serial_console = c - 'a' + 1;
410                         prom_printf ("Using /dev/tty%c as console.\n", c);
411                 }
412                 /* else Linux-style fbcon, not serial */
413         }
414 #if defined(CONFIG_PROM_CONSOLE)
415         if (!strncmp(commands, "prom", 4)) {
416                 char *p;
417
418                 for (p = commands - 8; *p && *p != ' '; p++)
419                         *p = ' ';
420                 conswitchp = &prom_con;
421         }
422 #endif
423 }
424
425 static void __init boot_flags_init(char *commands)
426 {
427         while (*commands) {
428                 /* Move to the start of the next "argument". */
429                 while (*commands && *commands == ' ')
430                         commands++;
431
432                 /* Process any command switches, otherwise skip it. */
433                 if (*commands == '\0')
434                         break;
435                 if (*commands == '-') {
436                         commands++;
437                         while (*commands && *commands != ' ')
438                                 process_switch(*commands++);
439                         continue;
440                 }
441                 if (!strncmp(commands, "console=", 8)) {
442                         process_console(commands);
443                 } else if (!strncmp(commands, "mem=", 4)) {
444                         /*
445                          * "mem=XXX[kKmM]" overrides the PROM-reported
446                          * memory size.
447                          */
448                         cmdline_memory_size = simple_strtoul(commands + 4,
449                                                              &commands, 0);
450                         if (*commands == 'K' || *commands == 'k') {
451                                 cmdline_memory_size <<= 10;
452                                 commands++;
453                         } else if (*commands=='M' || *commands=='m') {
454                                 cmdline_memory_size <<= 20;
455                                 commands++;
456                         }
457                 }
458                 while (*commands && *commands != ' ')
459                         commands++;
460         }
461 }
462
463 extern void panic_setup(char *, int *);
464
465 extern unsigned short root_flags;
466 extern unsigned short root_dev;
467 extern unsigned short ram_flags;
468 #define RAMDISK_IMAGE_START_MASK        0x07FF
469 #define RAMDISK_PROMPT_FLAG             0x8000
470 #define RAMDISK_LOAD_FLAG               0x4000
471
472 extern int root_mountflags;
473
474 char reboot_command[COMMAND_LINE_SIZE];
475
476 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
477
478 void register_prom_callbacks(void)
479 {
480         prom_setcallback(prom_callback);
481         prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
482                    "' linux-va>tte-data to va>tte-data");
483         prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
484                    "' linux-.soft1 to .soft1");
485         prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
486                    "' linux-.soft2 to .soft2");
487 }
488
489 void __init setup_arch(char **cmdline_p)
490 {
491         /* Initialize PROM console and command line. */
492         *cmdline_p = prom_getbootargs();
493         strcpy(saved_command_line, *cmdline_p);
494
495         printk("ARCH: SUN4U\n");
496
497 #ifdef CONFIG_DUMMY_CONSOLE
498         conswitchp = &dummy_con;
499 #elif defined(CONFIG_PROM_CONSOLE)
500         conswitchp = &prom_con;
501 #endif
502
503         /* Work out if we are starfire early on */
504         check_if_starfire();
505
506         boot_flags_init(*cmdline_p);
507
508         idprom_init();
509
510         if (!root_flags)
511                 root_mountflags &= ~MS_RDONLY;
512         ROOT_DEV = old_decode_dev(root_dev);
513 #ifdef CONFIG_BLK_DEV_INITRD
514         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
515         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
516         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
517 #endif
518
519         init_task.thread_info->kregs = &fake_swapper_regs;
520
521 #ifdef CONFIG_IP_PNP
522         if (!ic_set_manually) {
523                 int chosen = prom_finddevice ("/chosen");
524                 u32 cl, sv, gw;
525                 
526                 cl = prom_getintdefault (chosen, "client-ip", 0);
527                 sv = prom_getintdefault (chosen, "server-ip", 0);
528                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
529                 if (cl && sv) {
530                         ic_myaddr = cl;
531                         ic_servaddr = sv;
532                         if (gw)
533                                 ic_gateway = gw;
534 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
535                         ic_proto_enabled = 0;
536 #endif
537                 }
538         }
539 #endif
540
541         paging_init();
542 }
543
544 static int __init set_preferred_console(void)
545 {
546         int idev, odev;
547
548         /* The user has requested a console so this is already set up. */
549         if (serial_console >= 0)
550                 return -EBUSY;
551
552         idev = prom_query_input_device();
553         odev = prom_query_output_device();
554         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
555                 serial_console = 0;
556         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
557                 serial_console = 1;
558         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
559                 serial_console = 2;
560         } else {
561                 prom_printf("Inconsistent console: "
562                             "input %d, output %d\n",
563                             idev, odev);
564                 prom_halt();
565         }
566
567         if (serial_console)
568                 return add_preferred_console("ttyS", serial_console - 1, NULL);
569
570         return -ENODEV;
571 }
572 console_initcall(set_preferred_console);
573
574 /* BUFFER is PAGE_SIZE bytes long. */
575
576 extern char *sparc_cpu_type;
577 extern char *sparc_fpu_type;
578
579 extern void smp_info(struct seq_file *);
580 extern void smp_bogo(struct seq_file *);
581 extern void mmu_info(struct seq_file *);
582
583 unsigned int dcache_parity_tl1_occurred;
584 unsigned int icache_parity_tl1_occurred;
585
586 static int show_cpuinfo(struct seq_file *m, void *__unused)
587 {
588         seq_printf(m, 
589                    "cpu\t\t: %s\n"
590                    "fpu\t\t: %s\n"
591                    "promlib\t\t: Version 3 Revision %d\n"
592                    "prom\t\t: %d.%d.%d\n"
593                    "type\t\t: sun4u\n"
594                    "ncpus probed\t: %ld\n"
595                    "ncpus active\t: %ld\n"
596                    "D$ parity tl1\t: %u\n"
597                    "I$ parity tl1\t: %u\n"
598 #ifndef CONFIG_SMP
599                    "Cpu0Bogo\t: %lu.%02lu\n"
600                    "Cpu0ClkTck\t: %016lx\n"
601 #endif
602                    ,
603                    sparc_cpu_type,
604                    sparc_fpu_type,
605                    prom_rev,
606                    prom_prev >> 16,
607                    (prom_prev >> 8) & 0xff,
608                    prom_prev & 0xff,
609                    (long)num_possible_cpus(),
610                    (long)num_online_cpus(),
611                    dcache_parity_tl1_occurred,
612                    icache_parity_tl1_occurred
613 #ifndef CONFIG_SMP
614                    , cpu_data(0).udelay_val/(500000/HZ),
615                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
616                    cpu_data(0).clock_tick
617 #endif
618                 );
619 #ifdef CONFIG_SMP
620         smp_bogo(m);
621 #endif
622         mmu_info(m);
623 #ifdef CONFIG_SMP
624         smp_info(m);
625 #endif
626         return 0;
627 }
628
629 static void *c_start(struct seq_file *m, loff_t *pos)
630 {
631         /* The pointer we are returning is arbitrary,
632          * it just has to be non-NULL and not IS_ERR
633          * in the success case.
634          */
635         return *pos == 0 ? &c_start : NULL;
636 }
637
638 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
639 {
640         ++*pos;
641         return c_start(m, pos);
642 }
643
644 static void c_stop(struct seq_file *m, void *v)
645 {
646 }
647
648 struct seq_operations cpuinfo_op = {
649         .start =c_start,
650         .next = c_next,
651         .stop = c_stop,
652         .show = show_cpuinfo,
653 };
654
655 extern int stop_a_enabled;
656
657 void sun_do_break(void)
658 {
659         if (!stop_a_enabled)
660                 return;
661
662         prom_printf("\n");
663         flush_user_windows();
664
665         prom_cmdline();
666 }
667
668 int serial_console = -1;
669 int stop_a_enabled = 1;
670
671 static int __init topology_init(void)
672 {
673         int i, err;
674
675         err = -ENOMEM;
676         for (i = 0; i < NR_CPUS; i++) {
677                 if (cpu_possible(i)) {
678                         struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);
679
680                         if (p) {
681                                 memset(p, 0, sizeof(*p));
682                                 register_cpu(p, i, NULL);
683                                 err = 0;
684                         }
685                 }
686         }
687
688         return err;
689 }
690
691 subsys_initcall(topology_init);