xref: /linux/arch/sparc/kernel/setup.c (revision f3d9478b2ce468c3115b02ecae7e975990697f15) 
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/tty.h>
21 #include <linux/delay.h>
22 #include <linux/config.h>
23 #include <linux/fs.h>
24 #include <linux/seq_file.h>
25 #include <linux/syscalls.h>
26 #include <linux/kdev_t.h>
27 #include <linux/major.h>
28 #include <linux/string.h>
29 #include <linux/init.h>
30 #include <linux/interrupt.h>
31 #include <linux/console.h>
32 #include <linux/spinlock.h>
33 #include <linux/root_dev.h>
34 #include <linux/cpu.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/kdebug.h>
45 #include <asm/mbus.h>
46 #include <asm/idprom.h>
47 #include <asm/machines.h>
48 #include <asm/cpudata.h>
49 #include <asm/setup.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 void (*prom_palette)(int);
71 
72 /* Pretty sick eh? */
73 void prom_sync_me(void)
74 {
75 	unsigned long prom_tbr, flags;
76 
77 	/* XXX Badly broken. FIX! - Anton */
78 	local_irq_save(flags);
79 	__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
80 	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
81 			     "nop\n\t"
82 			     "nop\n\t"
83 			     "nop\n\t" : : "r" (&trapbase));
84 
85 	if (prom_palette)
86 		prom_palette(1);
87 	prom_printf("PROM SYNC COMMAND...\n");
88 	show_free_areas();
89 	if(current->pid != 0) {
90 		local_irq_enable();
91 		sys_sync();
92 		local_irq_disable();
93 	}
94 	prom_printf("Returning to prom\n");
95 
96 	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
97 			     "nop\n\t"
98 			     "nop\n\t"
99 			     "nop\n\t" : : "r" (prom_tbr));
100 	local_irq_restore(flags);
101 
102 	return;
103 }
104 
105 unsigned int boot_flags __initdata = 0;
106 #define BOOTME_DEBUG  0x1
107 #define BOOTME_SINGLE 0x2
108 
109 /* Exported for mm/init.c:paging_init. */
110 unsigned long cmdline_memory_size __initdata = 0;
111 
112 static void
113 prom_console_write(struct console *con, const char *s, unsigned n)
114 {
115 	prom_write(s, n);
116 }
117 
118 static struct console prom_debug_console = {
119 	.name =		"debug",
120 	.write =	prom_console_write,
121 	.flags =	CON_PRINTBUFFER,
122 	.index =	-1,
123 };
124 
125 int obp_system_intr(void)
126 {
127 	if (boot_flags & BOOTME_DEBUG) {
128 		printk("OBP: system interrupted\n");
129 		prom_halt();
130 		return 1;
131 	}
132 	return 0;
133 }
134 
135 /*
136  * Process kernel command line switches that are specific to the
137  * SPARC or that require special low-level processing.
138  */
139 static void __init process_switch(char c)
140 {
141 	switch (c) {
142 	case 'd':
143 		boot_flags |= BOOTME_DEBUG;
144 		break;
145 	case 's':
146 		boot_flags |= BOOTME_SINGLE;
147 		break;
148 	case 'h':
149 		prom_printf("boot_flags_init: Halt!\n");
150 		prom_halt();
151 		break;
152 	case 'p':
153 		/* Use PROM debug console. */
154 		register_console(&prom_debug_console);
155 		break;
156 	default:
157 		printk("Unknown boot switch (-%c)\n", c);
158 		break;
159 	}
160 }
161 
162 static void __init process_console(char *commands)
163 {
164 	serial_console = 0;
165 	commands += 8;
166 	/* Linux-style serial */
167 	if (!strncmp(commands, "ttyS", 4))
168 		serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
169 	else if (!strncmp(commands, "tty", 3)) {
170 		char c = *(commands + 3);
171 		/* Solaris-style serial */
172 		if (c == 'a' || c == 'b')
173 			serial_console = c - 'a' + 1;
174 		/* else Linux-style fbcon, not serial */
175 	}
176 #if defined(CONFIG_PROM_CONSOLE)
177 	if (!strncmp(commands, "prom", 4)) {
178 		char *p;
179 
180 		for (p = commands - 8; *p && *p != ' '; p++)
181 			*p = ' ';
182 		conswitchp = &prom_con;
183 	}
184 #endif
185 }
186 
187 static void __init boot_flags_init(char *commands)
188 {
189 	while (*commands) {
190 		/* Move to the start of the next "argument". */
191 		while (*commands && *commands == ' ')
192 			commands++;
193 
194 		/* Process any command switches, otherwise skip it. */
195 		if (*commands == '\0')
196 			break;
197 		if (*commands == '-') {
198 			commands++;
199 			while (*commands && *commands != ' ')
200 				process_switch(*commands++);
201 			continue;
202 		}
203 		if (!strncmp(commands, "console=", 8)) {
204 			process_console(commands);
205 		} else if (!strncmp(commands, "mem=", 4)) {
206 			/*
207 			 * "mem=XXX[kKmM] overrides the PROM-reported
208 			 * memory size.
209 			 */
210 			cmdline_memory_size = simple_strtoul(commands + 4,
211 						     &commands, 0);
212 			if (*commands == 'K' || *commands == 'k') {
213 				cmdline_memory_size <<= 10;
214 				commands++;
215 			} else if (*commands=='M' || *commands=='m') {
216 				cmdline_memory_size <<= 20;
217 				commands++;
218 			}
219 		}
220 		while (*commands && *commands != ' ')
221 			commands++;
222 	}
223 }
224 
225 /* This routine will in the future do all the nasty prom stuff
226  * to probe for the mmu type and its parameters, etc. This will
227  * also be where SMP things happen plus the Sparc specific memory
228  * physical memory probe as on the alpha.
229  */
230 
231 extern int prom_probe_memory(void);
232 extern void sun4c_probe_vac(void);
233 extern char cputypval;
234 extern unsigned long start, end;
235 extern void panic_setup(char *, int *);
236 
237 extern unsigned short root_flags;
238 extern unsigned short root_dev;
239 extern unsigned short ram_flags;
240 #define RAMDISK_IMAGE_START_MASK	0x07FF
241 #define RAMDISK_PROMPT_FLAG		0x8000
242 #define RAMDISK_LOAD_FLAG		0x4000
243 
244 extern int root_mountflags;
245 
246 char reboot_command[COMMAND_LINE_SIZE];
247 enum sparc_cpu sparc_cpu_model;
248 
249 struct tt_entry *sparc_ttable;
250 
251 struct pt_regs fake_swapper_regs;
252 
253 void __init setup_arch(char **cmdline_p)
254 {
255 	int i;
256 	unsigned long highest_paddr;
257 
258 	sparc_ttable = (struct tt_entry *) &start;
259 
260 	/* Initialize PROM console and command line. */
261 	*cmdline_p = prom_getbootargs();
262 	strcpy(saved_command_line, *cmdline_p);
263 
264 	/* Set sparc_cpu_model */
265 	sparc_cpu_model = sun_unknown;
266 	if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
267 	if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
268 	if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
269 	if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
270 	if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
271 	if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
272 	if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
273 
274 #ifdef CONFIG_SUN4
275 	if (sparc_cpu_model != sun4) {
276 		prom_printf("This kernel is for Sun4 architecture only.\n");
277 		prom_halt();
278 	}
279 #endif
280 	printk("ARCH: ");
281 	switch(sparc_cpu_model) {
282 	case sun4:
283 		printk("SUN4\n");
284 		break;
285 	case sun4c:
286 		printk("SUN4C\n");
287 		break;
288 	case sun4m:
289 		printk("SUN4M\n");
290 		break;
291 	case sun4d:
292 		printk("SUN4D\n");
293 		break;
294 	case sun4e:
295 		printk("SUN4E\n");
296 		break;
297 	case sun4u:
298 		printk("SUN4U\n");
299 		break;
300 	default:
301 		printk("UNKNOWN!\n");
302 		break;
303 	};
304 
305 #ifdef CONFIG_DUMMY_CONSOLE
306 	conswitchp = &dummy_con;
307 #elif defined(CONFIG_PROM_CONSOLE)
308 	conswitchp = &prom_con;
309 #endif
310 	boot_flags_init(*cmdline_p);
311 
312 	idprom_init();
313 	if (ARCH_SUN4C_SUN4)
314 		sun4c_probe_vac();
315 	load_mmu();
316 	(void) prom_probe_memory();
317 
318 	phys_base = 0xffffffffUL;
319 	highest_paddr = 0UL;
320 	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
321 		unsigned long top;
322 
323 		if (sp_banks[i].base_addr < phys_base)
324 			phys_base = sp_banks[i].base_addr;
325 		top = sp_banks[i].base_addr +
326 			sp_banks[i].num_bytes;
327 		if (highest_paddr < top)
328 			highest_paddr = top;
329 	}
330 	pfn_base = phys_base >> PAGE_SHIFT;
331 
332 	if (!root_flags)
333 		root_mountflags &= ~MS_RDONLY;
334 	ROOT_DEV = old_decode_dev(root_dev);
335 #ifdef CONFIG_BLK_DEV_INITRD
336 	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
337 	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
338 	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
339 #endif
340 
341 	prom_setsync(prom_sync_me);
342 
343 	if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
344 	   ((*(short *)linux_dbvec) != -1)) {
345 		printk("Booted under KADB. Syncing trap table.\n");
346 		(*(linux_dbvec->teach_debugger))();
347 	}
348 
349 	init_mm.context = (unsigned long) NO_CONTEXT;
350 	init_task.thread.kregs = &fake_swapper_regs;
351 
352 	smp_setup_cpu_possible_map();
353 
354 	paging_init();
355 }
356 
357 static int __init set_preferred_console(void)
358 {
359 	int idev, odev;
360 
361 	/* The user has requested a console so this is already set up. */
362 	if (serial_console >= 0)
363 		return -EBUSY;
364 
365 	idev = prom_query_input_device();
366 	odev = prom_query_output_device();
367 	if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
368 		serial_console = 0;
369 	} else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
370 		serial_console = 1;
371 	} else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
372 		serial_console = 2;
373 	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
374 		prom_printf("MrCoffee ttya\n");
375 		serial_console = 1;
376 	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
377 		serial_console = 0;
378 		prom_printf("MrCoffee keyboard\n");
379 	} else {
380 		prom_printf("Confusing console (idev %d, odev %d)\n",
381 		    idev, odev);
382 		serial_console = 1;
383 	}
384 
385 	if (serial_console)
386 		return add_preferred_console("ttyS", serial_console - 1, NULL);
387 
388 	return -ENODEV;
389 }
390 console_initcall(set_preferred_console);
391 
392 extern char *sparc_cpu_type;
393 extern char *sparc_fpu_type;
394 
395 static int ncpus_probed;
396 
397 static int show_cpuinfo(struct seq_file *m, void *__unused)
398 {
399 	seq_printf(m,
400 		   "cpu\t\t: %s\n"
401 		   "fpu\t\t: %s\n"
402 		   "promlib\t\t: Version %d Revision %d\n"
403 		   "prom\t\t: %d.%d\n"
404 		   "type\t\t: %s\n"
405 		   "ncpus probed\t: %d\n"
406 		   "ncpus active\t: %d\n"
407 #ifndef CONFIG_SMP
408 		   "CPU0Bogo\t: %lu.%02lu\n"
409 		   "CPU0ClkTck\t: %ld\n"
410 #endif
411 		   ,
412 		   sparc_cpu_type ? sparc_cpu_type : "undetermined",
413 		   sparc_fpu_type ? sparc_fpu_type : "undetermined",
414 		   romvec->pv_romvers,
415 		   prom_rev,
416 		   romvec->pv_printrev >> 16,
417 		   romvec->pv_printrev & 0xffff,
418 		   &cputypval,
419 		   ncpus_probed,
420 		   num_online_cpus()
421 #ifndef CONFIG_SMP
422 		   , cpu_data(0).udelay_val/(500000/HZ),
423 		   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
424 		   cpu_data(0).clock_tick
425 #endif
426 		);
427 
428 #ifdef CONFIG_SMP
429 	smp_bogo(m);
430 #endif
431 	mmu_info(m);
432 #ifdef CONFIG_SMP
433 	smp_info(m);
434 #endif
435 	return 0;
436 }
437 
438 static void *c_start(struct seq_file *m, loff_t *pos)
439 {
440 	/* The pointer we are returning is arbitrary,
441 	 * it just has to be non-NULL and not IS_ERR
442 	 * in the success case.
443 	 */
444 	return *pos == 0 ? &c_start : NULL;
445 }
446 
447 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
448 {
449 	++*pos;
450 	return c_start(m, pos);
451 }
452 
453 static void c_stop(struct seq_file *m, void *v)
454 {
455 }
456 
457 struct seq_operations cpuinfo_op = {
458 	.start =c_start,
459 	.next =	c_next,
460 	.stop =	c_stop,
461 	.show =	show_cpuinfo,
462 };
463 
464 extern int stop_a_enabled;
465 
466 void sun_do_break(void)
467 {
468 	if (!stop_a_enabled)
469 		return;
470 
471 	printk("\n");
472 	flush_user_windows();
473 
474 	prom_cmdline();
475 }
476 
477 int serial_console = -1;
478 int stop_a_enabled = 1;
479 
480 static int __init topology_init(void)
481 {
482 	int i, ncpus, err;
483 
484 	/* Count the number of physically present processors in
485 	 * the machine, even on uniprocessor, so that /proc/cpuinfo
486 	 * output is consistent with 2.4.x
487 	 */
488 	ncpus = 0;
489 	while (!cpu_find_by_instance(ncpus, NULL, NULL))
490 		ncpus++;
491 	ncpus_probed = ncpus;
492 
493 	err = 0;
494 	for_each_online_cpu(i) {
495 		struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
496 		if (!p)
497 			err = -ENOMEM;
498 		else
499 			register_cpu(p, i, NULL);
500 	}
501 
502 	return err;
503 }
504 
505 subsys_initcall(topology_init);
506