Make do_execve() take a const filename pointer
[linux-3.10.git] / 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
100 static unsigned int boot_flags __initdata = 0;
101 #define BOOTME_DEBUG  0x1
102
103 /* Exported for mm/init.c:paging_init. */
104 unsigned long cmdline_memory_size __initdata = 0;
105
106 static void
107 prom_console_write(struct console *con, const char *s, unsigned n)
108 {
109         prom_write(s, n);
110 }
111
112 static struct console prom_debug_console = {
113         .name =         "debug",
114         .write =        prom_console_write,
115         .flags =        CON_PRINTBUFFER,
116         .index =        -1,
117 };
118
119 /* 
120  * Process kernel command line switches that are specific to the
121  * SPARC or that require special low-level processing.
122  */
123 static void __init process_switch(char c)
124 {
125         switch (c) {
126         case 'd':
127                 boot_flags |= BOOTME_DEBUG;
128                 break;
129         case 's':
130                 break;
131         case 'h':
132                 prom_printf("boot_flags_init: Halt!\n");
133                 prom_halt();
134                 break;
135         case 'p':
136                 /* Use PROM debug console. */
137                 register_console(&prom_debug_console);
138                 break;
139         default:
140                 printk("Unknown boot switch (-%c)\n", c);
141                 break;
142         }
143 }
144
145 static void __init boot_flags_init(char *commands)
146 {
147         while (*commands) {
148                 /* Move to the start of the next "argument". */
149                 while (*commands && *commands == ' ')
150                         commands++;
151
152                 /* Process any command switches, otherwise skip it. */
153                 if (*commands == '\0')
154                         break;
155                 if (*commands == '-') {
156                         commands++;
157                         while (*commands && *commands != ' ')
158                                 process_switch(*commands++);
159                         continue;
160                 }
161                 if (!strncmp(commands, "mem=", 4)) {
162                         /*
163                          * "mem=XXX[kKmM] overrides the PROM-reported
164                          * memory size.
165                          */
166                         cmdline_memory_size = simple_strtoul(commands + 4,
167                                                      &commands, 0);
168                         if (*commands == 'K' || *commands == 'k') {
169                                 cmdline_memory_size <<= 10;
170                                 commands++;
171                         } else if (*commands=='M' || *commands=='m') {
172                                 cmdline_memory_size <<= 20;
173                                 commands++;
174                         }
175                 }
176                 while (*commands && *commands != ' ')
177                         commands++;
178         }
179 }
180
181 /* This routine will in the future do all the nasty prom stuff
182  * to probe for the mmu type and its parameters, etc. This will
183  * also be where SMP things happen.
184  */
185
186 extern void sun4c_probe_vac(void);
187 extern char cputypval;
188 extern unsigned long start, end;
189
190 extern unsigned short root_flags;
191 extern unsigned short root_dev;
192 extern unsigned short ram_flags;
193 #define RAMDISK_IMAGE_START_MASK        0x07FF
194 #define RAMDISK_PROMPT_FLAG             0x8000
195 #define RAMDISK_LOAD_FLAG               0x4000
196
197 extern int root_mountflags;
198
199 char reboot_command[COMMAND_LINE_SIZE];
200
201 enum sparc_cpu sparc_cpu_model;
202 EXPORT_SYMBOL(sparc_cpu_model);
203
204 struct tt_entry *sparc_ttable;
205
206 struct pt_regs fake_swapper_regs;
207
208 void __init setup_arch(char **cmdline_p)
209 {
210         int i;
211         unsigned long highest_paddr;
212
213         sparc_ttable = (struct tt_entry *) &start;
214
215         /* Initialize PROM console and command line. */
216         *cmdline_p = prom_getbootargs();
217         strcpy(boot_command_line, *cmdline_p);
218         parse_early_param();
219
220         /* Set sparc_cpu_model */
221         sparc_cpu_model = sun_unknown;
222         if (!strcmp(&cputypval,"sun4 "))
223                 sparc_cpu_model = sun4;
224         if (!strcmp(&cputypval,"sun4c"))
225                 sparc_cpu_model = sun4c;
226         if (!strcmp(&cputypval,"sun4m"))
227                 sparc_cpu_model = sun4m;
228         if (!strcmp(&cputypval,"sun4s"))
229                 sparc_cpu_model = sun4m; /* CP-1200 with PROM 2.30 -E */
230         if (!strcmp(&cputypval,"sun4d"))
231                 sparc_cpu_model = sun4d;
232         if (!strcmp(&cputypval,"sun4e"))
233                 sparc_cpu_model = sun4e;
234         if (!strcmp(&cputypval,"sun4u"))
235                 sparc_cpu_model = sun4u;
236         if (!strncmp(&cputypval, "leon" , 4))
237                 sparc_cpu_model = sparc_leon;
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         case sparc_leon:
260                 printk("LEON\n");
261                 break;
262         default:
263                 printk("UNKNOWN!\n");
264                 break;
265         };
266
267 #ifdef CONFIG_DUMMY_CONSOLE
268         conswitchp = &dummy_con;
269 #endif
270         boot_flags_init(*cmdline_p);
271
272         idprom_init();
273         if (ARCH_SUN4C)
274                 sun4c_probe_vac();
275         load_mmu();
276
277         phys_base = 0xffffffffUL;
278         highest_paddr = 0UL;
279         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
280                 unsigned long top;
281
282                 if (sp_banks[i].base_addr < phys_base)
283                         phys_base = sp_banks[i].base_addr;
284                 top = sp_banks[i].base_addr +
285                         sp_banks[i].num_bytes;
286                 if (highest_paddr < top)
287                         highest_paddr = top;
288         }
289         pfn_base = phys_base >> PAGE_SHIFT;
290
291         if (!root_flags)
292                 root_mountflags &= ~MS_RDONLY;
293         ROOT_DEV = old_decode_dev(root_dev);
294 #ifdef CONFIG_BLK_DEV_RAM
295         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
296         rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
297         rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);     
298 #endif
299
300         prom_setsync(prom_sync_me);
301
302         if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) && 
303            ((*(short *)linux_dbvec) != -1)) {
304                 printk("Booted under KADB. Syncing trap table.\n");
305                 (*(linux_dbvec->teach_debugger))();
306         }
307
308         init_mm.context = (unsigned long) NO_CONTEXT;
309         init_task.thread.kregs = &fake_swapper_regs;
310
311         paging_init();
312
313         smp_setup_cpu_possible_map();
314 }
315
316 static int ncpus_probed;
317
318 static int show_cpuinfo(struct seq_file *m, void *__unused)
319 {
320         seq_printf(m,
321                    "cpu\t\t: %s\n"
322                    "fpu\t\t: %s\n"
323                    "promlib\t\t: Version %d Revision %d\n"
324                    "prom\t\t: %d.%d\n"
325                    "type\t\t: %s\n"
326                    "ncpus probed\t: %d\n"
327                    "ncpus active\t: %d\n"
328 #ifndef CONFIG_SMP
329                    "CPU0Bogo\t: %lu.%02lu\n"
330                    "CPU0ClkTck\t: %ld\n"
331 #endif
332                    ,
333                    sparc_cpu_type,
334                    sparc_fpu_type ,
335                    romvec->pv_romvers,
336                    prom_rev,
337                    romvec->pv_printrev >> 16,
338                    romvec->pv_printrev & 0xffff,
339                    &cputypval,
340                    ncpus_probed,
341                    num_online_cpus()
342 #ifndef CONFIG_SMP
343                    , cpu_data(0).udelay_val/(500000/HZ),
344                    (cpu_data(0).udelay_val/(5000/HZ)) % 100,
345                    cpu_data(0).clock_tick
346 #endif
347                 );
348
349 #ifdef CONFIG_SMP
350         smp_bogo(m);
351 #endif
352         mmu_info(m);
353 #ifdef CONFIG_SMP
354         smp_info(m);
355 #endif
356         return 0;
357 }
358
359 static void *c_start(struct seq_file *m, loff_t *pos)
360 {
361         /* The pointer we are returning is arbitrary,
362          * it just has to be non-NULL and not IS_ERR
363          * in the success case.
364          */
365         return *pos == 0 ? &c_start : NULL;
366 }
367
368 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
369 {
370         ++*pos;
371         return c_start(m, pos);
372 }
373
374 static void c_stop(struct seq_file *m, void *v)
375 {
376 }
377
378 const struct seq_operations cpuinfo_op = {
379         .start =c_start,
380         .next = c_next,
381         .stop = c_stop,
382         .show = show_cpuinfo,
383 };
384
385 extern int stop_a_enabled;
386
387 void sun_do_break(void)
388 {
389         if (!stop_a_enabled)
390                 return;
391
392         printk("\n");
393         flush_user_windows();
394
395         prom_cmdline();
396 }
397 EXPORT_SYMBOL(sun_do_break);
398
399 int stop_a_enabled = 1;
400
401 static int __init topology_init(void)
402 {
403         int i, ncpus, err;
404
405         /* Count the number of physically present processors in
406          * the machine, even on uniprocessor, so that /proc/cpuinfo
407          * output is consistent with 2.4.x
408          */
409         ncpus = 0;
410         while (!cpu_find_by_instance(ncpus, NULL, NULL))
411                 ncpus++;
412         ncpus_probed = ncpus;
413
414         err = 0;
415         for_each_online_cpu(i) {
416                 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
417                 if (!p)
418                         err = -ENOMEM;
419                 else
420                         register_cpu(p, i);
421         }
422
423         return err;
424 }
425
426 subsys_initcall(topology_init);