64c0ed98820aa8870f7107e09c09c8df69fddd50
[linux-2.6.git] / arch / sparc / kernel / setup.c
1 /*  $Id: setup.c,v 1.126 2001/11/13 00:49:27 davem Exp $
2  *  linux/arch/sparc/kernel/setup.c
3  *
4  *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
5  *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
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 <linux/initrd.h>
17 #include <asm/smp.h>
18 #include <linux/user.h>
19 #include <linux/a.out.h>
20 #include <linux/screen_info.h>
21 #include <linux/delay.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/interrupt.h>
30 #include <linux/console.h>
31 #include <linux/spinlock.h>
32 #include <linux/root_dev.h>
33 #include <linux/cpu.h>
34 #include <linux/kdebug.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/traps.h>
43 #include <asm/vaddrs.h>
44 #include <asm/mbus.h>
45 #include <asm/idprom.h>
46 #include <asm/machines.h>
47 #include <asm/cpudata.h>
48 #include <asm/setup.h>
49
50 struct screen_info screen_info = {
51         0, 0,                   /* orig-x, orig-y */
52         0,                      /* unused */
53         0,                      /* orig-video-page */
54         0,                      /* orig-video-mode */
55         128,                    /* orig-video-cols */
56         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
57         54,                     /* orig-video-lines */
58         0,                      /* orig-video-isVGA */
59         16                      /* orig-video-points */
60 };
61
62 /* Typing sync at the prom prompt calls the function pointed to by
63  * romvec->pv_synchook which I set to the following function.
64  * This should sync all filesystems and return, for now it just
65  * prints out pretty messages and returns.
66  */
67
68 extern unsigned long trapbase;
69 void (*prom_palette)(int);
70
71 /* Pretty sick eh? */
72 void prom_sync_me(void)
73 {
74         unsigned long prom_tbr, flags;
75
76         /* XXX Badly broken. FIX! - Anton */
77         local_irq_save(flags);
78         __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
79         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
80                              "nop\n\t"
81                              "nop\n\t"
82                              "nop\n\t" : : "r" (&trapbase));
83
84         if (prom_palette)
85                 prom_palette(1);
86         prom_printf("PROM SYNC COMMAND...\n");
87         show_free_areas();
88         if(current->pid != 0) {
89                 local_irq_enable();
90                 sys_sync();
91                 local_irq_disable();
92         }
93         prom_printf("Returning to prom\n");
94
95         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
96                              "nop\n\t"
97                              "nop\n\t"
98                              "nop\n\t" : : "r" (prom_tbr));
99         local_irq_restore(flags);
100
101         return;
102 }
103
104 unsigned int boot_flags __initdata = 0;
105 #define BOOTME_DEBUG  0x1
106
107 /* Exported for mm/init.c:paging_init. */
108 unsigned long cmdline_memory_size __initdata = 0;
109
110 static void
111 prom_console_write(struct console *con, const char *s, unsigned n)
112 {
113         prom_write(s, n);
114 }
115
116 static struct console prom_debug_console = {
117         .name =         "debug",
118         .write =        prom_console_write,
119         .flags =        CON_PRINTBUFFER,
120         .index =        -1,
121 };
122
123 /* 
124  * Process kernel command line switches that are specific to the
125  * SPARC or that require special low-level processing.
126  */
127 static void __init process_switch(char c)
128 {
129         switch (c) {
130         case 'd':
131                 boot_flags |= BOOTME_DEBUG;
132                 break;
133         case 's':
134                 break;
135         case 'h':
136                 prom_printf("boot_flags_init: Halt!\n");
137                 prom_halt();
138                 break;
139         case 'p':
140                 /* Use PROM debug console. */
141                 register_console(&prom_debug_console);
142                 break;
143         default:
144                 printk("Unknown boot switch (-%c)\n", c);
145                 break;
146         }
147 }
148
149 static void __init process_console(char *commands)
150 {
151         serial_console = 0;
152         commands += 8;
153         /* Linux-style serial */
154         if (!strncmp(commands, "ttyS", 4))
155                 serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
156         else if (!strncmp(commands, "tty", 3)) {
157                 char c = *(commands + 3);
158                 /* Solaris-style serial */
159                 if (c == 'a' || c == 'b')
160                         serial_console = c - 'a' + 1;
161                 /* else Linux-style fbcon, not serial */
162         }
163 #if defined(CONFIG_PROM_CONSOLE)
164         if (!strncmp(commands, "prom", 4)) {
165                 char *p;
166
167                 for (p = commands - 8; *p && *p != ' '; p++)
168                         *p = ' ';
169                 conswitchp = &prom_con;
170         }
171 #endif
172 }
173
174 static void __init boot_flags_init(char *commands)
175 {
176         while (*commands) {
177                 /* Move to the start of the next "argument". */
178                 while (*commands && *commands == ' ')
179                         commands++;
180
181                 /* Process any command switches, otherwise skip it. */
182                 if (*commands == '\0')
183                         break;
184                 if (*commands == '-') {
185                         commands++;
186                         while (*commands && *commands != ' ')
187                                 process_switch(*commands++);
188                         continue;
189                 }
190                 if (!strncmp(commands, "console=", 8)) {
191                         process_console(commands);
192                 } else if (!strncmp(commands, "mem=", 4)) {
193                         /*
194                          * "mem=XXX[kKmM] overrides the PROM-reported
195                          * memory size.
196                          */
197                         cmdline_memory_size = simple_strtoul(commands + 4,
198                                                      &commands, 0);
199                         if (*commands == 'K' || *commands == 'k') {
200                                 cmdline_memory_size <<= 10;
201                                 commands++;
202                         } else if (*commands=='M' || *commands=='m') {
203                                 cmdline_memory_size <<= 20;
204                                 commands++;
205                         }
206                 }
207                 while (*commands && *commands != ' ')
208                         commands++;
209         }
210 }
211
212 /* This routine will in the future do all the nasty prom stuff
213  * to probe for the mmu type and its parameters, etc. This will
214  * also be where SMP things happen plus the Sparc specific memory
215  * physical memory probe as on the alpha.
216  */
217
218 extern int prom_probe_memory(void);
219 extern void sun4c_probe_vac(void);
220 extern char cputypval;
221 extern unsigned long start, end;
222 extern void panic_setup(char *, int *);
223
224 extern unsigned short root_flags;
225 extern unsigned short root_dev;
226 extern unsigned short ram_flags;
227 #define RAMDISK_IMAGE_START_MASK        0x07FF
228 #define RAMDISK_PROMPT_FLAG             0x8000
229 #define RAMDISK_LOAD_FLAG               0x4000
230
231 extern int root_mountflags;
232
233 char reboot_command[COMMAND_LINE_SIZE];
234 enum sparc_cpu sparc_cpu_model;
235
236 struct tt_entry *sparc_ttable;
237
238 struct pt_regs fake_swapper_regs;
239
240 void __init setup_arch(char **cmdline_p)
241 {
242         int i;
243         unsigned long highest_paddr;
244
245         sparc_ttable = (struct tt_entry *) &start;
246
247         /* Initialize PROM console and command line. */
248         *cmdline_p = prom_getbootargs();
249         strcpy(boot_command_line, *cmdline_p);
250
251         /* Set sparc_cpu_model */
252         sparc_cpu_model = sun_unknown;
253         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
254         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
255         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
256         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
257         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
258         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
259         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
260
261 #ifdef CONFIG_SUN4
262         if (sparc_cpu_model != sun4) {
263                 prom_printf("This kernel is for Sun4 architecture only.\n");
264                 prom_halt();
265         }
266 #endif
267         printk("ARCH: ");
268         switch(sparc_cpu_model) {
269         case sun4:
270                 printk("SUN4\n");
271                 break;
272         case sun4c:
273                 printk("SUN4C\n");
274                 break;
275         case sun4m:
276                 printk("SUN4M\n");
277                 break;
278         case sun4d:
279                 printk("SUN4D\n");
280                 break;
281         case sun4e:
282                 printk("SUN4E\n");
283                 break;
284         case sun4u:
285                 printk("SUN4U\n");
286                 break;
287         default:
288                 printk("UNKNOWN!\n");
289                 break;
290         };
291
292 #ifdef CONFIG_DUMMY_CONSOLE
293         conswitchp = &dummy_con;
294 #elif defined(CONFIG_PROM_CONSOLE)
295         conswitchp = &prom_con;
296 #endif
297         boot_flags_init(*cmdline_p);
298
299         idprom_init();
300         if (ARCH_SUN4C_SUN4)
301                 sun4c_probe_vac();
302         load_mmu();
303         (void) prom_probe_memory();
304
305         phys_base = 0xffffffffUL;
306         highest_paddr = 0UL;
307         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
308                 unsigned long top;
309
310                 if (sp_banks[i].base_addr < phys_base)
311                         phys_base = sp_banks[i].base_addr;
312                 top = sp_banks[i].base_addr +
313                         sp_banks[i].num_bytes;
314                 if (highest_paddr < top)
315                         highest_paddr = top;
316         }
317         pfn_base = phys_base >> PAGE_SHIFT;
318
319         if (!root_flags)
320                 root_mountflags &= ~MS_RDONLY;
321         ROOT_DEV = old_decode_dev(root_dev);
322 #ifdef CONFIG_BLK_DEV_RAM
323         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
324         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
325         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
326 #endif
327
328         prom_setsync(prom_sync_me);
329
330         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
331            ((*(short *)linux_dbvec) != -1)) {
332                 printk("Booted under KADB. Syncing trap table.\n");
333                 (*(linux_dbvec->teach_debugger))();
334         }
335
336         init_mm.context = (unsigned long) NO_CONTEXT;
337         init_task.thread.kregs = &fake_swapper_regs;
338
339         paging_init();
340
341         smp_setup_cpu_possible_map();
342 }
343
344 static int __init set_preferred_console(void)
345 {
346         int idev, odev;
347
348         /* The user has requested a console so this is already set up. */
349         if (serial_console >= 0)
350                 return -EBUSY;
351
352         idev = prom_query_input_device();
353         odev = prom_query_output_device();
354         if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
355                 serial_console = 0;
356         } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
357                 serial_console = 1;
358         } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
359                 serial_console = 2;
360         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
361                 prom_printf("MrCoffee ttya\n");
362                 serial_console = 1;
363         } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
364                 serial_console = 0;
365                 prom_printf("MrCoffee keyboard\n");
366         } else {
367                 prom_printf("Confusing console (idev %d, odev %d)\n",
368                     idev, odev);
369                 serial_console = 1;
370         }
371
372         if (serial_console)
373                 return add_preferred_console("ttyS", serial_console - 1, NULL);
374
375         return -ENODEV;
376 }
377 console_initcall(set_preferred_console);
378
379 extern char *sparc_cpu_type;
380 extern char *sparc_fpu_type;
381
382 static int ncpus_probed;
383
384 static int show_cpuinfo(struct seq_file *m, void *__unused)
385 {
386         seq_printf(m,
387                    "cpu\t\t: %s\n"
388                    "fpu\t\t: %s\n"
389                    "promlib\t\t: Version %d Revision %d\n"
390                    "prom\t\t: %d.%d\n"
391                    "type\t\t: %s\n"
392                    "ncpus probed\t: %d\n"
393                    "ncpus active\t: %d\n"
394 #ifndef CONFIG_SMP
395                    "CPU0Bogo\t: %lu.%02lu\n"
396                    "CPU0ClkTck\t: %ld\n"
397 #endif
398                    ,
399                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
400                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
401                    romvec->pv_romvers,
402                    prom_rev,
403                    romvec->pv_printrev >> 16,
404                    romvec->pv_printrev & 0xffff,
405                    &cputypval,
406                    ncpus_probed,
407                    num_online_cpus()
408 #ifndef CONFIG_SMP
409                    , cpu_data(0).udelay_val/(500000/HZ),
410                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
411                    cpu_data(0).clock_tick
412 #endif
413                 );
414
415 #ifdef CONFIG_SMP
416         smp_bogo(m);
417 #endif
418         mmu_info(m);
419 #ifdef CONFIG_SMP
420         smp_info(m);
421 #endif
422         return 0;
423 }
424
425 static void *c_start(struct seq_file *m, loff_t *pos)
426 {
427         /* The pointer we are returning is arbitrary,
428          * it just has to be non-NULL and not IS_ERR
429          * in the success case.
430          */
431         return *pos == 0 ? &c_start : NULL;
432 }
433
434 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
435 {
436         ++*pos;
437         return c_start(m, pos);
438 }
439
440 static void c_stop(struct seq_file *m, void *v)
441 {
442 }
443
444 struct seq_operations cpuinfo_op = {
445         .start =c_start,
446         .next = c_next,
447         .stop = c_stop,
448         .show = show_cpuinfo,
449 };
450
451 extern int stop_a_enabled;
452
453 void sun_do_break(void)
454 {
455         if (!stop_a_enabled)
456                 return;
457
458         printk("\n");
459         flush_user_windows();
460
461         prom_cmdline();
462 }
463
464 int serial_console = -1;
465 int stop_a_enabled = 1;
466
467 static int __init topology_init(void)
468 {
469         int i, ncpus, err;
470
471         /* Count the number of physically present processors in
472          * the machine, even on uniprocessor, so that /proc/cpuinfo
473          * output is consistent with 2.4.x
474          */
475         ncpus = 0;
476         while (!cpu_find_by_instance(ncpus, NULL, NULL))
477                 ncpus++;
478         ncpus_probed = ncpus;
479
480         err = 0;
481         for_each_online_cpu(i) {
482                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
483                 if (!p)
484                         err = -ENOMEM;
485                 else
486                         register_cpu(p, i);
487         }
488
489         return err;
490 }
491
492 subsys_initcall(topology_init);