File: /usr/src/linux/arch/sparc/kernel/setup.c
1 /* $Id: setup.c,v 1.125 2001/09/20 00:35:30 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 <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/kdev_t.h>
24 #include <linux/major.h>
25 #include <linux/string.h>
26 #include <linux/blk.h>
27 #include <linux/init.h>
28 #include <linux/interrupt.h>
29 #include <linux/console.h>
30 #include <linux/spinlock.h>
31
32 #include <asm/segment.h>
33 #include <asm/system.h>
34 #include <asm/io.h>
35 #include <asm/kgdb.h>
36 #include <asm/processor.h>
37 #include <asm/oplib.h>
38 #include <asm/page.h>
39 #include <asm/pgtable.h>
40 #include <asm/traps.h>
41 #include <asm/vaddrs.h>
42 #include <asm/kdebug.h>
43 #include <asm/mbus.h>
44 #include <asm/idprom.h>
45 #include <asm/softirq.h>
46 #include <asm/hardirq.h>
47 #include <asm/machines.h>
48
49 #undef PROM_DEBUG_CONSOLE
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 extern int serial_console;
71 extern void breakpoint(void);
72 #if CONFIG_SUN_CONSOLE
73 void (*prom_palette)(int);
74 #endif
75 asmlinkage void sys_sync(void); /* it's really int */
76
77 /* Pretty sick eh? */
78 void prom_sync_me(void)
79 {
80 unsigned long prom_tbr, flags;
81
82 /* XXX Badly broken. FIX! - Anton */
83 save_and_cli(flags);
84 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
85 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
86 "nop\n\t"
87 "nop\n\t"
88 "nop\n\t" : : "r" (&trapbase));
89
90 #ifdef CONFIG_SUN_CONSOLE
91 if (prom_palette)
92 prom_palette(1);
93 #endif
94 prom_printf("PROM SYNC COMMAND...\n");
95 show_free_areas();
96 if(current->pid != 0) {
97 sti();
98 sys_sync();
99 cli();
100 }
101 prom_printf("Returning to prom\n");
102
103 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
104 "nop\n\t"
105 "nop\n\t"
106 "nop\n\t" : : "r" (prom_tbr));
107 restore_flags(flags);
108
109 return;
110 }
111
112 extern void rs_kgdb_hook(int tty_num); /* sparc/serial.c */
113
114 unsigned int boot_flags __initdata = 0;
115 #define BOOTME_DEBUG 0x1
116 #define BOOTME_SINGLE 0x2
117 #define BOOTME_KGDBA 0x4
118 #define BOOTME_KGDBB 0x8
119 #define BOOTME_KGDB 0xc
120
121 #ifdef CONFIG_SUN_CONSOLE
122 static int console_fb __initdata = 0;
123 #endif
124
125 /* Exported for mm/init.c:paging_init. */
126 unsigned long cmdline_memory_size __initdata = 0;
127
128 void kernel_enter_debugger(void)
129 {
130 if (boot_flags & BOOTME_KGDB) {
131 printk("KGDB: Entered\n");
132 breakpoint();
133 }
134 }
135
136 int obp_system_intr(void)
137 {
138 if (boot_flags & BOOTME_KGDB) {
139 printk("KGDB: system interrupted\n");
140 breakpoint();
141 return 1;
142 }
143 if (boot_flags & BOOTME_DEBUG) {
144 printk("OBP: system interrupted\n");
145 prom_halt();
146 return 1;
147 }
148 return 0;
149 }
150
151 /*
152 * Process kernel command line switches that are specific to the
153 * SPARC or that require special low-level processing.
154 */
155 static void __init process_switch(char c)
156 {
157 switch (c) {
158 case 'd':
159 boot_flags |= BOOTME_DEBUG;
160 break;
161 case 's':
162 boot_flags |= BOOTME_SINGLE;
163 break;
164 case 'h':
165 prom_printf("boot_flags_init: Halt!\n");
166 prom_halt();
167 break;
168 default:
169 printk("Unknown boot switch (-%c)\n", c);
170 break;
171 }
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 else if (*commands == '-') {
185 commands++;
186 while (*commands && *commands != ' ')
187 process_switch(*commands++);
188 } else if (strlen(commands) >= 9
189 && !strncmp(commands, "kgdb=tty", 8)) {
190 switch (commands[8]) {
191 #ifdef CONFIG_SUN_SERIAL
192 case 'a':
193 boot_flags |= BOOTME_KGDBA;
194 prom_printf("KGDB: Using serial line /dev/ttya.\n");
195 break;
196 case 'b':
197 boot_flags |= BOOTME_KGDBB;
198 prom_printf("KGDB: Using serial line /dev/ttyb.\n");
199 break;
200 #endif
201 default:
202 printk("KGDB: Unknown tty line.\n");
203 break;
204 }
205 commands += 9;
206 } else {
207 #if CONFIG_SUN_CONSOLE
208 if (!strncmp(commands, "console=", 8)) {
209 commands += 8;
210 if (!strncmp (commands, "ttya", 4)) {
211 console_fb = 2;
212 prom_printf ("Using /dev/ttya as console.\n");
213 } else if (!strncmp (commands, "ttyb", 4)) {
214 console_fb = 3;
215 prom_printf ("Using /dev/ttyb as console.\n");
216 #if defined(CONFIG_PROM_CONSOLE)
217 } else if (!strncmp (commands, "prom", 4)) {
218 char *p;
219
220 for (p = commands - 8; *p && *p != ' '; p++)
221 *p = ' ';
222 conswitchp = &prom_con;
223 console_fb = 1;
224 #endif
225 } else {
226 console_fb = 1;
227 }
228 } else
229 #endif
230 if (!strncmp(commands, "mem=", 4)) {
231 /*
232 * "mem=XXX[kKmM] overrides the PROM-reported
233 * memory size.
234 */
235 cmdline_memory_size = simple_strtoul(commands + 4,
236 &commands, 0);
237 if (*commands == 'K' || *commands == 'k') {
238 cmdline_memory_size <<= 10;
239 commands++;
240 } else if (*commands=='M' || *commands=='m') {
241 cmdline_memory_size <<= 20;
242 commands++;
243 }
244 }
245 while (*commands && *commands != ' ')
246 commands++;
247 }
248 }
249 }
250
251 /* This routine will in the future do all the nasty prom stuff
252 * to probe for the mmu type and its parameters, etc. This will
253 * also be where SMP things happen plus the Sparc specific memory
254 * physical memory probe as on the alpha.
255 */
256
257 extern int prom_probe_memory(void);
258 extern void sun4c_probe_vac(void);
259 extern char cputypval;
260 extern unsigned long start, end;
261 extern void panic_setup(char *, int *);
262 extern void srmmu_end_memory(unsigned long, unsigned long *);
263 extern void sun_serial_setup(void);
264
265 extern unsigned short root_flags;
266 extern unsigned short root_dev;
267 extern unsigned short ram_flags;
268 #define RAMDISK_IMAGE_START_MASK 0x07FF
269 #define RAMDISK_PROMPT_FLAG 0x8000
270 #define RAMDISK_LOAD_FLAG 0x4000
271
272 extern int root_mountflags;
273
274 char saved_command_line[256];
275 char reboot_command[256];
276 enum sparc_cpu sparc_cpu_model;
277
278 struct tt_entry *sparc_ttable;
279
280 struct pt_regs fake_swapper_regs;
281
282 #ifdef PROM_DEBUG_CONSOLE
283 static void
284 prom_console_write(struct console *con, const char *s, unsigned n)
285 {
286 prom_printf("%s", s);
287 }
288
289 static struct console prom_console = {
290 name: "debug",
291 write: prom_console_write,
292 flags: CON_PRINTBUFFER,
293 index: -1,
294 };
295 #endif
296
297 extern void paging_init(void);
298
299 void __init setup_arch(char **cmdline_p)
300 {
301 int i;
302 unsigned long highest_paddr;
303
304 sparc_ttable = (struct tt_entry *) &start;
305
306 /* Initialize PROM console and command line. */
307 *cmdline_p = prom_getbootargs();
308 strcpy(saved_command_line, *cmdline_p);
309
310 /* Set sparc_cpu_model */
311 sparc_cpu_model = sun_unknown;
312 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
313 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
314 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
315 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */
316 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
317 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
318 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
319
320 #ifdef CONFIG_SUN4
321 if (sparc_cpu_model != sun4) {
322 prom_printf("This kernel is for Sun4 architecture only.\n");
323 prom_halt();
324 }
325 #endif
326 printk("ARCH: ");
327 switch(sparc_cpu_model) {
328 case sun4:
329 printk("SUN4\n");
330 break;
331 case sun4c:
332 printk("SUN4C\n");
333 break;
334 case sun4m:
335 printk("SUN4M\n");
336 break;
337 case sun4d:
338 printk("SUN4D\n");
339 break;
340 case sun4e:
341 printk("SUN4E\n");
342 break;
343 case sun4u:
344 printk("SUN4U\n");
345 break;
346 default:
347 printk("UNKNOWN!\n");
348 break;
349 };
350 #ifdef PROM_DEBUG_CONSOLE
351 register_console(&prom_console);
352 #endif
353
354 #ifdef CONFIG_DUMMY_CONSOLE
355 conswitchp = &dummy_con;
356 #elif defined(CONFIG_PROM_CONSOLE)
357 conswitchp = &prom_con;
358 #endif
359 boot_flags_init(*cmdline_p);
360
361 idprom_init();
362 if (ARCH_SUN4C_SUN4)
363 sun4c_probe_vac();
364 load_mmu();
365 (void) prom_probe_memory();
366
367 phys_base = 0xffffffffUL;
368 highest_paddr = 0UL;
369 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
370 unsigned long top;
371
372 if (sp_banks[i].base_addr < phys_base)
373 phys_base = sp_banks[i].base_addr;
374 top = sp_banks[i].base_addr +
375 sp_banks[i].num_bytes;
376 if (highest_paddr < top)
377 highest_paddr = top;
378 }
379
380 if (!root_flags)
381 root_mountflags &= ~MS_RDONLY;
382 ROOT_DEV = to_kdev_t(root_dev);
383 #ifdef CONFIG_BLK_DEV_RAM
384 rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
385 rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
386 rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
387 #endif
388
389 prom_setsync(prom_sync_me);
390
391 {
392 #if !CONFIG_SUN_SERIAL
393 serial_console = 0;
394 #else
395 switch (console_fb) {
396 case 0: /* Let get our io devices from prom */
397 {
398 int idev = prom_query_input_device();
399 int odev = prom_query_output_device();
400 if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
401 serial_console = 0;
402 } else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
403 serial_console = 1;
404 } else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
405 serial_console = 2;
406 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
407 prom_printf("MrCoffee ttya\n");
408 serial_console = 1;
409 } else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
410 serial_console = 0;
411 prom_printf("MrCoffee keyboard\n");
412 } else {
413 prom_printf("Inconsistent or unknown console\n");
414 prom_printf("You cannot mix serial and non serial input/output devices\n");
415 prom_halt();
416 }
417 }
418 break;
419 case 1: serial_console = 0; break; /* Force one of the framebuffers as console */
420 case 2: serial_console = 1; break; /* Force ttya as console */
421 case 3: serial_console = 2; break; /* Force ttyb as console */
422 }
423 #endif
424 }
425
426 if ((boot_flags & BOOTME_KGDBA)) {
427 rs_kgdb_hook(0);
428 }
429 if ((boot_flags & BOOTME_KGDBB)) {
430 rs_kgdb_hook(1);
431 }
432
433 if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
434 ((*(short *)linux_dbvec) != -1)) {
435 printk("Booted under KADB. Syncing trap table.\n");
436 (*(linux_dbvec->teach_debugger))();
437 }
438 if((boot_flags & BOOTME_KGDB)) {
439 set_debug_traps();
440 prom_printf ("Breakpoint!\n");
441 breakpoint();
442 }
443
444 init_mm.context = (unsigned long) NO_CONTEXT;
445 init_task.thread.kregs = &fake_swapper_regs;
446
447 if (serial_console)
448 conswitchp = NULL;
449
450 paging_init();
451 }
452
453 asmlinkage int sys_ioperm(unsigned long from, unsigned long num, int on)
454 {
455 return -EIO;
456 }
457
458 /* BUFFER is PAGE_SIZE bytes long. */
459
460 extern char *sparc_cpu_type[];
461 extern char *sparc_fpu_type[];
462
463 int get_cpuinfo(char *buffer)
464 {
465 int cpuid=hard_smp_processor_id();
466 int len;
467
468 len = sprintf(buffer, "cpu\t\t: %s\n"
469 "fpu\t\t: %s\n"
470 "promlib\t\t: Version %d Revision %d\n"
471 "prom\t\t: %d.%d\n"
472 "type\t\t: %s\n"
473 "ncpus probed\t: %d\n"
474 "ncpus active\t: %d\n"
475 #ifndef CONFIG_SMP
476 "BogoMips\t: %lu.%02lu\n"
477 #endif
478 ,
479 sparc_cpu_type[cpuid] ? : "undetermined",
480 sparc_fpu_type[cpuid] ? : "undetermined",
481 romvec->pv_romvers, prom_rev, romvec->pv_printrev >> 16, (short)romvec->pv_printrev,
482 &cputypval,
483 linux_num_cpus, smp_num_cpus
484 #ifndef CONFIG_SMP
485 , loops_per_jiffy/(500000/HZ), (loops_per_jiffy/(5000/HZ)) % 100
486 #endif
487 );
488 #ifdef CONFIG_SMP
489 len += smp_bogo_info(buffer + len);
490 #endif
491 len += mmu_info(buffer + len);
492 #ifdef CONFIG_SMP
493 len += smp_info(buffer + len);
494 #endif
495 return len;
496 }
497