Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / arch / sparc / kernel / setup_32.c
1 /*
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/screen_info.h>
20 #include <linux/delay.h>
21 #include <linux/fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/kdev_t.h>
25 #include <linux/major.h>
26 #include <linux/string.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/console.h>
30 #include <linux/spinlock.h>
31 #include <linux/root_dev.h>
32 #include <linux/cpu.h>
33 #include <linux/kdebug.h>
34
35 #include <asm/system.h>
36 #include <asm/io.h>
37 #include <asm/processor.h>
38 #include <asm/oplib.h>
39 #include <asm/page.h>
40 #include <asm/pgtable.h>
41 #include <asm/traps.h>
42 #include <asm/vaddrs.h>
43 #include <asm/mbus.h>
44 #include <asm/idprom.h>
45 #include <asm/machines.h>
46 #include <asm/cpudata.h>
47 #include <asm/setup.h>
48
49 #include "kernel.h"
50
51 struct screen_info screen_info = {
52         0, 0,                   /* orig-x, orig-y */
53         0,                      /* unused */
54         0,                      /* orig-video-page */
55         0,                      /* orig-video-mode */
56         128,                    /* orig-video-cols */
57         0,0,0,                  /* ega_ax, ega_bx, ega_cx */
58         54,                     /* orig-video-lines */
59         0,                      /* orig-video-isVGA */
60         16                      /* orig-video-points */
61 };
62
63 /* Typing sync at the prom prompt calls the function pointed to by
64  * romvec->pv_synchook which I set to the following function.
65  * This should sync all filesystems and return, for now it just
66  * prints out pretty messages and returns.
67  */
68
69 extern unsigned long trapbase;
70
71 /* Pretty sick eh? */
72 static 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         prom_printf("PROM SYNC COMMAND...\n");
85         show_free_areas();
86         if(current->pid != 0) {
87                 local_irq_enable();
88                 sys_sync();
89                 local_irq_disable();
90         }
91         prom_printf("Returning to prom\n");
92
93         __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
94                              "nop\n\t"
95                              "nop\n\t"
96                              "nop\n\t" : : "r" (prom_tbr));
97         local_irq_restore(flags);
98
99         return;
100 }
101
102 static unsigned int boot_flags __initdata = 0;
103 #define BOOTME_DEBUG  0x1
104
105 /* Exported for mm/init.c:paging_init. */
106 unsigned long cmdline_memory_size __initdata = 0;
107
108 static void
109 prom_console_write(struct console *con, const char *s, unsigned n)
110 {
111         prom_write(s, n);
112 }
113
114 static struct console prom_debug_console = {
115         .name =         "debug",
116         .write =        prom_console_write,
117         .flags =        CON_PRINTBUFFER,
118         .index =        -1,
119 };
120
121 /* 
122  * Process kernel command line switches that are specific to the
123  * SPARC or that require special low-level processing.
124  */
125 static void __init process_switch(char c)
126 {
127         switch (c) {
128         case 'd':
129                 boot_flags |= BOOTME_DEBUG;
130                 break;
131         case 's':
132                 break;
133         case 'h':
134                 prom_printf("boot_flags_init: Halt!\n");
135                 prom_halt();
136                 break;
137         case 'p':
138                 /* Use PROM debug console. */
139                 register_console(&prom_debug_console);
140                 break;
141         default:
142                 printk("Unknown boot switch (-%c)\n", c);
143                 break;
144         }
145 }
146
147 static void __init boot_flags_init(char *commands)
148 {
149         while (*commands) {
150                 /* Move to the start of the next "argument". */
151                 while (*commands && *commands == ' ')
152                         commands++;
153
154                 /* Process any command switches, otherwise skip it. */
155                 if (*commands == '\0')
156                         break;
157                 if (*commands == '-') {
158                         commands++;
159                         while (*commands && *commands != ' ')
160                                 process_switch(*commands++);
161                         continue;
162                 }
163                 if (!strncmp(commands, "mem=", 4)) {
164                         /*
165                          * "mem=XXX[kKmM] overrides the PROM-reported
166                          * memory size.
167                          */
168                         cmdline_memory_size = simple_strtoul(commands + 4,
169                                                      &commands, 0);
170                         if (*commands == 'K' || *commands == 'k') {
171                                 cmdline_memory_size <<= 10;
172                                 commands++;
173                         } else if (*commands=='M' || *commands=='m') {
174                                 cmdline_memory_size <<= 20;
175                                 commands++;
176                         }
177                 }
178                 while (*commands && *commands != ' ')
179                         commands++;
180         }
181 }
182
183 /* This routine will in the future do all the nasty prom stuff
184  * to probe for the mmu type and its parameters, etc. This will
185  * also be where SMP things happen.
186  */
187
188 extern void sun4c_probe_vac(void);
189 extern char cputypval;
190 extern unsigned long start, end;
191
192 extern unsigned short root_flags;
193 extern unsigned short root_dev;
194 extern unsigned short ram_flags;
195 #define RAMDISK_IMAGE_START_MASK        0x07FF
196 #define RAMDISK_PROMPT_FLAG             0x8000
197 #define RAMDISK_LOAD_FLAG               0x4000
198
199 extern int root_mountflags;
200
201 char reboot_command[COMMAND_LINE_SIZE];
202
203 enum sparc_cpu sparc_cpu_model;
204 EXPORT_SYMBOL(sparc_cpu_model);
205
206 struct tt_entry *sparc_ttable;
207
208 struct pt_regs fake_swapper_regs;
209
210 void __init setup_arch(char **cmdline_p)
211 {
212         int i;
213         unsigned long highest_paddr;
214
215         sparc_ttable = (struct tt_entry *) &start;
216
217         /* Initialize PROM console and command line. */
218         *cmdline_p = prom_getbootargs();
219         strcpy(boot_command_line, *cmdline_p);
220         parse_early_param();
221
222         /* Set sparc_cpu_model */
223         sparc_cpu_model = sun_unknown;
224         if (!strcmp(&cputypval,"sun4 "))
225                 sparc_cpu_model = sun4;
226         if (!strcmp(&cputypval,"sun4c"))
227                 sparc_cpu_model = sun4c;
228         if (!strcmp(&cputypval,"sun4m"))
229                 sparc_cpu_model = sun4m;
230         if (!strcmp(&cputypval,"sun4s"))
231                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
232         if (!strcmp(&cputypval,"sun4d"))
233                 sparc_cpu_model = sun4d;
234         if (!strcmp(&cputypval,"sun4e"))
235                 sparc_cpu_model = sun4e;
236         if (!strcmp(&cputypval,"sun4u"))
237                 sparc_cpu_model = sun4u;
238
239         printk("ARCH: ");
240         switch(sparc_cpu_model) {
241         case sun4:
242                 printk("SUN4\n");
243                 break;
244         case sun4c:
245                 printk("SUN4C\n");
246                 break;
247         case sun4m:
248                 printk("SUN4M\n");
249                 break;
250         case sun4d:
251                 printk("SUN4D\n");
252                 break;
253         case sun4e:
254                 printk("SUN4E\n");
255                 break;
256         case sun4u:
257                 printk("SUN4U\n");
258                 break;
259         default:
260                 printk("UNKNOWN!\n");
261                 break;
262         };
263
264 #ifdef CONFIG_DUMMY_CONSOLE
265         conswitchp = &dummy_con;
266 #elif defined(CONFIG_PROM_CONSOLE)
267         conswitchp = &prom_con;
268 #endif
269         boot_flags_init(*cmdline_p);
270
271         idprom_init();
272         if (ARCH_SUN4C)
273                 sun4c_probe_vac();
274         load_mmu();
275
276         phys_base = 0xffffffffUL;
277         highest_paddr = 0UL;
278         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
279                 unsigned long top;
280
281                 if (sp_banks[i].base_addr < phys_base)
282                         phys_base = sp_banks[i].base_addr;
283                 top = sp_banks[i].base_addr +
284                         sp_banks[i].num_bytes;
285                 if (highest_paddr < top)
286                         highest_paddr = top;
287         }
288         pfn_base = phys_base >> PAGE_SHIFT;
289
290         if (!root_flags)
291                 root_mountflags &= ~MS_RDONLY;
292         ROOT_DEV = old_decode_dev(root_dev);
293 #ifdef CONFIG_BLK_DEV_RAM
294         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
295         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
296         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
297 #endif
298
299         prom_setsync(prom_sync_me);
300
301         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
302            ((*(short *)linux_dbvec) != -1)) {
303                 printk("Booted under KADB. Syncing trap table.\n");
304                 (*(linux_dbvec->teach_debugger))();
305         }
306
307         init_mm.context = (unsigned long) NO_CONTEXT;
308         init_task.thread.kregs = &fake_swapper_regs;
309
310         paging_init();
311
312         smp_setup_cpu_possible_map();
313 }
314
315 static int ncpus_probed;
316
317 static int show_cpuinfo(struct seq_file *m, void *__unused)
318 {
319         seq_printf(m,
320                    "cpu\t\t: %s\n"
321                    "fpu\t\t: %s\n"
322                    "promlib\t\t: Version %d Revision %d\n"
323                    "prom\t\t: %d.%d\n"
324                    "type\t\t: %s\n"
325                    "ncpus probed\t: %d\n"
326                    "ncpus active\t: %d\n"
327 #ifndef CONFIG_SMP
328                    "CPU0Bogo\t: %lu.%02lu\n"
329                    "CPU0ClkTck\t: %ld\n"
330 #endif
331                    ,
332                    sparc_cpu_type,
333                    sparc_fpu_type ,
334                    romvec->pv_romvers,
335                    prom_rev,
336                    romvec->pv_printrev >> 16,
337                    romvec->pv_printrev & 0xffff,
338                    &cputypval,
339                    ncpus_probed,
340                    num_online_cpus()
341 #ifndef CONFIG_SMP
342                    , cpu_data(0).udelay_val/(500000/HZ),
343                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
344                    cpu_data(0).clock_tick
345 #endif
346                 );
347
348 #ifdef CONFIG_SMP
349         smp_bogo(m);
350 #endif
351         mmu_info(m);
352 #ifdef CONFIG_SMP
353         smp_info(m);
354 #endif
355         return 0;
356 }
357
358 static void *c_start(struct seq_file *m, loff_t *pos)
359 {
360         /* The pointer we are returning is arbitrary,
361          * it just has to be non-NULL and not IS_ERR
362          * in the success case.
363          */
364         return *pos == 0 ? &c_start : NULL;
365 }
366
367 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
368 {
369         ++*pos;
370         return c_start(m, pos);
371 }
372
373 static void c_stop(struct seq_file *m, void *v)
374 {
375 }
376
377 const struct seq_operations cpuinfo_op = {
378         .start =c_start,
379         .next = c_next,
380         .stop = c_stop,
381         .show = show_cpuinfo,
382 };
383
384 extern int stop_a_enabled;
385
386 void sun_do_break(void)
387 {
388         if (!stop_a_enabled)
389                 return;
390
391         printk("\n");
392         flush_user_windows();
393
394         prom_cmdline();
395 }
396 EXPORT_SYMBOL(sun_do_break);
397
398 int stop_a_enabled = 1;
399
400 static int __init topology_init(void)
401 {
402         int i, ncpus, err;
403
404         /* Count the number of physically present processors in
405          * the machine, even on uniprocessor, so that /proc/cpuinfo
406          * output is consistent with 2.4.x
407          */
408         ncpus = 0;
409         while (!cpu_find_by_instance(ncpus, NULL, NULL))
410                 ncpus++;
411         ncpus_probed = ncpus;
412
413         err = 0;
414         for_each_online_cpu(i) {
415                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
416                 if (!p)
417                         err = -ENOMEM;
418                 else
419                         register_cpu(p, i);
420         }
421
422         return err;
423 }
424
425 subsys_initcall(topology_init);