[SPARC]: Constify function pointer tables.
[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 boot_flags_init(char *commands)
150 {
151         while (*commands) {
152                 /* Move to the start of the next "argument". */
153                 while (*commands && *commands == ' ')
154                         commands++;
155
156                 /* Process any command switches, otherwise skip it. */
157                 if (*commands == '\0')
158                         break;
159                 if (*commands == '-') {
160                         commands++;
161                         while (*commands && *commands != ' ')
162                                 process_switch(*commands++);
163                         continue;
164                 }
165                 if (!strncmp(commands, "mem=", 4)) {
166                         /*
167                          * "mem=XXX[kKmM] overrides the PROM-reported
168                          * memory size.
169                          */
170                         cmdline_memory_size = simple_strtoul(commands + 4,
171                                                      &commands, 0);
172                         if (*commands == 'K' || *commands == 'k') {
173                                 cmdline_memory_size <<= 10;
174                                 commands++;
175                         } else if (*commands=='M' || *commands=='m') {
176                                 cmdline_memory_size <<= 20;
177                                 commands++;
178                         }
179                 }
180                 while (*commands && *commands != ' ')
181                         commands++;
182         }
183 }
184
185 /* This routine will in the future do all the nasty prom stuff
186  * to probe for the mmu type and its parameters, etc. This will
187  * also be where SMP things happen plus the Sparc specific memory
188  * physical memory probe as on the alpha.
189  */
190
191 extern int prom_probe_memory(void);
192 extern void sun4c_probe_vac(void);
193 extern char cputypval;
194 extern unsigned long start, end;
195 extern void panic_setup(char *, int *);
196
197 extern unsigned short root_flags;
198 extern unsigned short root_dev;
199 extern unsigned short ram_flags;
200 #define RAMDISK_IMAGE_START_MASK        0x07FF
201 #define RAMDISK_PROMPT_FLAG             0x8000
202 #define RAMDISK_LOAD_FLAG               0x4000
203
204 extern int root_mountflags;
205
206 char reboot_command[COMMAND_LINE_SIZE];
207 enum sparc_cpu sparc_cpu_model;
208
209 struct tt_entry *sparc_ttable;
210
211 struct pt_regs fake_swapper_regs;
212
213 void __init setup_arch(char **cmdline_p)
214 {
215         int i;
216         unsigned long highest_paddr;
217
218         sparc_ttable = (struct tt_entry *) &start;
219
220         /* Initialize PROM console and command line. */
221         *cmdline_p = prom_getbootargs();
222         strcpy(boot_command_line, *cmdline_p);
223
224         /* Set sparc_cpu_model */
225         sparc_cpu_model = sun_unknown;
226         if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
227         if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
228         if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
229         if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
230         if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
231         if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
232         if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
233
234 #ifdef CONFIG_SUN4
235         if (sparc_cpu_model != sun4) {
236                 prom_printf("This kernel is for Sun4 architecture only.\n");
237                 prom_halt();
238         }
239 #endif
240         printk("ARCH: ");
241         switch(sparc_cpu_model) {
242         case sun4:
243                 printk("SUN4\n");
244                 break;
245         case sun4c:
246                 printk("SUN4C\n");
247                 break;
248         case sun4m:
249                 printk("SUN4M\n");
250                 break;
251         case sun4d:
252                 printk("SUN4D\n");
253                 break;
254         case sun4e:
255                 printk("SUN4E\n");
256                 break;
257         case sun4u:
258                 printk("SUN4U\n");
259                 break;
260         default:
261                 printk("UNKNOWN!\n");
262                 break;
263         };
264
265 #ifdef CONFIG_DUMMY_CONSOLE
266         conswitchp = &dummy_con;
267 #elif defined(CONFIG_PROM_CONSOLE)
268         conswitchp = &prom_con;
269 #endif
270         boot_flags_init(*cmdline_p);
271
272         idprom_init();
273         if (ARCH_SUN4C_SUN4)
274                 sun4c_probe_vac();
275         load_mmu();
276         (void) prom_probe_memory();
277
278         phys_base = 0xffffffffUL;
279         highest_paddr = 0UL;
280         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
281                 unsigned long top;
282
283                 if (sp_banks[i].base_addr < phys_base)
284                         phys_base = sp_banks[i].base_addr;
285                 top = sp_banks[i].base_addr +
286                         sp_banks[i].num_bytes;
287                 if (highest_paddr < top)
288                         highest_paddr = top;
289         }
290         pfn_base = phys_base >> PAGE_SHIFT;
291
292         if (!root_flags)
293                 root_mountflags &= ~MS_RDONLY;
294         ROOT_DEV = old_decode_dev(root_dev);
295 #ifdef CONFIG_BLK_DEV_RAM
296         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
297         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
298         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
299 #endif
300
301         prom_setsync(prom_sync_me);
302
303         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
304            ((*(short *)linux_dbvec) != -1)) {
305                 printk("Booted under KADB. Syncing trap table.\n");
306                 (*(linux_dbvec->teach_debugger))();
307         }
308
309         init_mm.context = (unsigned long) NO_CONTEXT;
310         init_task.thread.kregs = &fake_swapper_regs;
311
312         paging_init();
313
314         smp_setup_cpu_possible_map();
315 }
316
317 extern char *sparc_cpu_type;
318 extern char *sparc_fpu_type;
319
320 static int ncpus_probed;
321
322 static int show_cpuinfo(struct seq_file *m, void *__unused)
323 {
324         seq_printf(m,
325                    "cpu\t\t: %s\n"
326                    "fpu\t\t: %s\n"
327                    "promlib\t\t: Version %d Revision %d\n"
328                    "prom\t\t: %d.%d\n"
329                    "type\t\t: %s\n"
330                    "ncpus probed\t: %d\n"
331                    "ncpus active\t: %d\n"
332 #ifndef CONFIG_SMP
333                    "CPU0Bogo\t: %lu.%02lu\n"
334                    "CPU0ClkTck\t: %ld\n"
335 #endif
336                    ,
337                    sparc_cpu_type ? sparc_cpu_type : "undetermined",
338                    sparc_fpu_type ? sparc_fpu_type : "undetermined",
339                    romvec->pv_romvers,
340                    prom_rev,
341                    romvec->pv_printrev >> 16,
342                    romvec->pv_printrev & 0xffff,
343                    &cputypval,
344                    ncpus_probed,
345                    num_online_cpus()
346 #ifndef CONFIG_SMP
347                    , cpu_data(0).udelay_val/(500000/HZ),
348                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
349                    cpu_data(0).clock_tick
350 #endif
351                 );
352
353 #ifdef CONFIG_SMP
354         smp_bogo(m);
355 #endif
356         mmu_info(m);
357 #ifdef CONFIG_SMP
358         smp_info(m);
359 #endif
360         return 0;
361 }
362
363 static void *c_start(struct seq_file *m, loff_t *pos)
364 {
365         /* The pointer we are returning is arbitrary,
366          * it just has to be non-NULL and not IS_ERR
367          * in the success case.
368          */
369         return *pos == 0 ? &c_start : NULL;
370 }
371
372 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
373 {
374         ++*pos;
375         return c_start(m, pos);
376 }
377
378 static void c_stop(struct seq_file *m, void *v)
379 {
380 }
381
382 const struct seq_operations cpuinfo_op = {
383         .start =c_start,
384         .next = c_next,
385         .stop = c_stop,
386         .show = show_cpuinfo,
387 };
388
389 extern int stop_a_enabled;
390
391 void sun_do_break(void)
392 {
393         if (!stop_a_enabled)
394                 return;
395
396         printk("\n");
397         flush_user_windows();
398
399         prom_cmdline();
400 }
401
402 int stop_a_enabled = 1;
403
404 static int __init topology_init(void)
405 {
406         int i, ncpus, err;
407
408         /* Count the number of physically present processors in
409          * the machine, even on uniprocessor, so that /proc/cpuinfo
410          * output is consistent with 2.4.x
411          */
412         ncpus = 0;
413         while (!cpu_find_by_instance(ncpus, NULL, NULL))
414                 ncpus++;
415         ncpus_probed = ncpus;
416
417         err = 0;
418         for_each_online_cpu(i) {
419                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
420                 if (!p)
421                         err = -ENOMEM;
422                 else
423                         register_cpu(p, i);
424         }
425
426         return err;
427 }
428
429 subsys_initcall(topology_init);