xref: /linux/arch/sparc/kernel/setup.c (revision 13abf8130139c2ccd4962a7e5a8902be5e6cb5a7) 
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 
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/kdebug.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 #define BOOTME_SINGLE 0x2
107 
108 /* Exported for mm/init.c:paging_init. */
109 unsigned long cmdline_memory_size __initdata = 0;
110 
111 static void
112 prom_console_write(struct console *con, const char *s, unsigned n)
113 {
114 	prom_write(s, n);
115 }
116 
117 static struct console prom_debug_console = {
118 	.name =		"debug",
119 	.write =	prom_console_write,
120 	.flags =	CON_PRINTBUFFER,
121 	.index =	-1,
122 };
123 
124 int obp_system_intr(void)
125 {
126 	if (boot_flags & BOOTME_DEBUG) {
127 		printk("OBP: system interrupted\n");
128 		prom_halt();
129 		return 1;
130 	}
131 	return 0;
132 }
133 
134 /*
135  * Process kernel command line switches that are specific to the
136  * SPARC or that require special low-level processing.
137  */
138 static void __init process_switch(char c)
139 {
140 	switch (c) {
141 	case 'd':
142 		boot_flags |= BOOTME_DEBUG;
143 		break;
144 	case 's':
145 		boot_flags |= BOOTME_SINGLE;
146 		break;
147 	case 'h':
148 		prom_printf("boot_flags_init: Halt!\n");
149 		prom_halt();
150 		break;
151 	case 'p':
152 		/* Use PROM debug console. */
153 		register_console(&prom_debug_console);
154 		break;
155 	default:
156 		printk("Unknown boot switch (-%c)\n", c);
157 		break;
158 	}
159 }
160 
161 static void __init process_console(char *commands)
162 {
163 	serial_console = 0;
164 	commands += 8;
165 	/* Linux-style serial */
166 	if (!strncmp(commands, "ttyS", 4))
167 		serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
168 	else if (!strncmp(commands, "tty", 3)) {
169 		char c = *(commands + 3);
170 		/* Solaris-style serial */
171 		if (c == 'a' || c == 'b')
172 			serial_console = c - 'a' + 1;
173 		/* else Linux-style fbcon, not serial */
174 	}
175 #if defined(CONFIG_PROM_CONSOLE)
176 	if (!strncmp(commands, "prom", 4)) {
177 		char *p;
178 
179 		for (p = commands - 8; *p && *p != ' '; p++)
180 			*p = ' ';
181 		conswitchp = &prom_con;
182 	}
183 #endif
184 }
185 
186 static void __init boot_flags_init(char *commands)
187 {
188 	while (*commands) {
189 		/* Move to the start of the next "argument". */
190 		while (*commands && *commands == ' ')
191 			commands++;
192 
193 		/* Process any command switches, otherwise skip it. */
194 		if (*commands == '\0')
195 			break;
196 		if (*commands == '-') {
197 			commands++;
198 			while (*commands && *commands != ' ')
199 				process_switch(*commands++);
200 			continue;
201 		}
202 		if (!strncmp(commands, "console=", 8)) {
203 			process_console(commands);
204 		} else if (!strncmp(commands, "mem=", 4)) {
205 			/*
206 			 * "mem=XXX[kKmM] overrides the PROM-reported
207 			 * memory size.
208 			 */
209 			cmdline_memory_size = simple_strtoul(commands + 4,
210 						     &commands, 0);
211 			if (*commands == 'K' || *commands == 'k') {
212 				cmdline_memory_size <<= 10;
213 				commands++;
214 			} else if (*commands=='M' || *commands=='m') {
215 				cmdline_memory_size <<= 20;
216 				commands++;
217 			}
218 		}
219 		while (*commands && *commands != ' ')
220 			commands++;
221 	}
222 }
223 
224 /* This routine will in the future do all the nasty prom stuff
225  * to probe for the mmu type and its parameters, etc. This will
226  * also be where SMP things happen plus the Sparc specific memory
227  * physical memory probe as on the alpha.
228  */
229 
230 extern int prom_probe_memory(void);
231 extern void sun4c_probe_vac(void);
232 extern char cputypval;
233 extern unsigned long start, end;
234 extern void panic_setup(char *, int *);
235 
236 extern unsigned short root_flags;
237 extern unsigned short root_dev;
238 extern unsigned short ram_flags;
239 #define RAMDISK_IMAGE_START_MASK	0x07FF
240 #define RAMDISK_PROMPT_FLAG		0x8000
241 #define RAMDISK_LOAD_FLAG		0x4000
242 
243 extern int root_mountflags;
244 
245 char reboot_command[COMMAND_LINE_SIZE];
246 enum sparc_cpu sparc_cpu_model;
247 
248 struct tt_entry *sparc_ttable;
249 
250 struct pt_regs fake_swapper_regs;
251 
252 extern void paging_init(void);
253 
254 void __init setup_arch(char **cmdline_p)
255 {
256 	int i;
257 	unsigned long highest_paddr;
258 
259 	sparc_ttable = (struct tt_entry *) &start;
260 
261 	/* Initialize PROM console and command line. */
262 	*cmdline_p = prom_getbootargs();
263 	strcpy(saved_command_line, *cmdline_p);
264 
265 	/* Set sparc_cpu_model */
266 	sparc_cpu_model = sun_unknown;
267 	if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
268 	if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
269 	if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
270 	if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
271 	if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
272 	if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
273 	if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
274 
275 #ifdef CONFIG_SUN4
276 	if (sparc_cpu_model != sun4) {
277 		prom_printf("This kernel is for Sun4 architecture only.\n");
278 		prom_halt();
279 	}
280 #endif
281 	printk("ARCH: ");
282 	switch(sparc_cpu_model) {
283 	case sun4:
284 		printk("SUN4\n");
285 		break;
286 	case sun4c:
287 		printk("SUN4C\n");
288 		break;
289 	case sun4m:
290 		printk("SUN4M\n");
291 		break;
292 	case sun4d:
293 		printk("SUN4D\n");
294 		break;
295 	case sun4e:
296 		printk("SUN4E\n");
297 		break;
298 	case sun4u:
299 		printk("SUN4U\n");
300 		break;
301 	default:
302 		printk("UNKNOWN!\n");
303 		break;
304 	};
305 
306 #ifdef CONFIG_DUMMY_CONSOLE
307 	conswitchp = &dummy_con;
308 #elif defined(CONFIG_PROM_CONSOLE)
309 	conswitchp = &prom_con;
310 #endif
311 	boot_flags_init(*cmdline_p);
312 
313 	idprom_init();
314 	if (ARCH_SUN4C_SUN4)
315 		sun4c_probe_vac();
316 	load_mmu();
317 	(void) prom_probe_memory();
318 
319 	phys_base = 0xffffffffUL;
320 	highest_paddr = 0UL;
321 	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
322 		unsigned long top;
323 
324 		if (sp_banks[i].base_addr < phys_base)
325 			phys_base = sp_banks[i].base_addr;
326 		top = sp_banks[i].base_addr +
327 			sp_banks[i].num_bytes;
328 		if (highest_paddr < top)
329 			highest_paddr = top;
330 	}
331 	pfn_base = phys_base >> PAGE_SHIFT;
332 
333 	if (!root_flags)
334 		root_mountflags &= ~MS_RDONLY;
335 	ROOT_DEV = old_decode_dev(root_dev);
336 #ifdef CONFIG_BLK_DEV_INITRD
337 	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
338 	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
339 	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
340 #endif
341 
342 	prom_setsync(prom_sync_me);
343 
344 	if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
345 	   ((*(short *)linux_dbvec) != -1)) {
346 		printk("Booted under KADB. Syncing trap table.\n");
347 		(*(linux_dbvec->teach_debugger))();
348 	}
349 
350 	init_mm.context = (unsigned long) NO_CONTEXT;
351 	init_task.thread.kregs = &fake_swapper_regs;
352 
353 	paging_init();
354 }
355 
356 static int __init set_preferred_console(void)
357 {
358 	int idev, odev;
359 
360 	/* The user has requested a console so this is already set up. */
361 	if (serial_console >= 0)
362 		return -EBUSY;
363 
364 	idev = prom_query_input_device();
365 	odev = prom_query_output_device();
366 	if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
367 		serial_console = 0;
368 	} else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
369 		serial_console = 1;
370 	} else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
371 		serial_console = 2;
372 	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
373 		prom_printf("MrCoffee ttya\n");
374 		serial_console = 1;
375 	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
376 		serial_console = 0;
377 		prom_printf("MrCoffee keyboard\n");
378 	} else {
379 		prom_printf("Confusing console (idev %d, odev %d)\n",
380 		    idev, odev);
381 		serial_console = 1;
382 	}
383 
384 	if (serial_console)
385 		return add_preferred_console("ttyS", serial_console - 1, NULL);
386 
387 	return -ENODEV;
388 }
389 console_initcall(set_preferred_console);
390 
391 extern char *sparc_cpu_type;
392 extern char *sparc_fpu_type;
393 
394 static int show_cpuinfo(struct seq_file *m, void *__unused)
395 {
396 	seq_printf(m,
397 		   "cpu\t\t: %s\n"
398 		   "fpu\t\t: %s\n"
399 		   "promlib\t\t: Version %d Revision %d\n"
400 		   "prom\t\t: %d.%d\n"
401 		   "type\t\t: %s\n"
402 		   "ncpus probed\t: %d\n"
403 		   "ncpus active\t: %d\n"
404 #ifndef CONFIG_SMP
405 		   "CPU0Bogo\t: %lu.%02lu\n"
406 		   "CPU0ClkTck\t: %ld\n"
407 #endif
408 		   ,
409 		   sparc_cpu_type ? sparc_cpu_type : "undetermined",
410 		   sparc_fpu_type ? sparc_fpu_type : "undetermined",
411 		   romvec->pv_romvers,
412 		   prom_rev,
413 		   romvec->pv_printrev >> 16,
414 		   romvec->pv_printrev & 0xffff,
415 		   &cputypval,
416 		   num_possible_cpus(),
417 		   num_online_cpus()
418 #ifndef CONFIG_SMP
419 		   , cpu_data(0).udelay_val/(500000/HZ),
420 		   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
421 		   cpu_data(0).clock_tick
422 #endif
423 		);
424 
425 #ifdef CONFIG_SMP
426 	smp_bogo(m);
427 #endif
428 	mmu_info(m);
429 #ifdef CONFIG_SMP
430 	smp_info(m);
431 #endif
432 	return 0;
433 }
434 
435 static void *c_start(struct seq_file *m, loff_t *pos)
436 {
437 	/* The pointer we are returning is arbitrary,
438 	 * it just has to be non-NULL and not IS_ERR
439 	 * in the success case.
440 	 */
441 	return *pos == 0 ? &c_start : NULL;
442 }
443 
444 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
445 {
446 	++*pos;
447 	return c_start(m, pos);
448 }
449 
450 static void c_stop(struct seq_file *m, void *v)
451 {
452 }
453 
454 struct seq_operations cpuinfo_op = {
455 	.start =c_start,
456 	.next =	c_next,
457 	.stop =	c_stop,
458 	.show =	show_cpuinfo,
459 };
460 
461 extern int stop_a_enabled;
462 
463 void sun_do_break(void)
464 {
465 	if (!stop_a_enabled)
466 		return;
467 
468 	printk("\n");
469 	flush_user_windows();
470 
471 	prom_cmdline();
472 }
473 
474 int serial_console = -1;
475 int stop_a_enabled = 1;
476