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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $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>
Jon Smirl894673e2006-07-10 04:44:13 -070019#include <linux/screen_info.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#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>
Bob Breuera8cbdce2006-06-20 00:28:33 -070032#include <linux/cpu.h>
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070033#include <linux/kdebug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#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
49struct screen_info screen_info = {
50 0, 0, /* orig-x, orig-y */
51 0, /* unused */
52 0, /* orig-video-page */
53 0, /* orig-video-mode */
54 128, /* orig-video-cols */
55 0,0,0, /* ega_ax, ega_bx, ega_cx */
56 54, /* orig-video-lines */
57 0, /* orig-video-isVGA */
58 16 /* orig-video-points */
59};
60
61/* Typing sync at the prom prompt calls the function pointed to by
62 * romvec->pv_synchook which I set to the following function.
63 * This should sync all filesystems and return, for now it just
64 * prints out pretty messages and returns.
65 */
66
67extern unsigned long trapbase;
68void (*prom_palette)(int);
69
70/* Pretty sick eh? */
71void prom_sync_me(void)
72{
73 unsigned long prom_tbr, flags;
74
75 /* XXX Badly broken. FIX! - Anton */
76 local_irq_save(flags);
77 __asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
78 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
79 "nop\n\t"
80 "nop\n\t"
81 "nop\n\t" : : "r" (&trapbase));
82
83 if (prom_palette)
84 prom_palette(1);
85 prom_printf("PROM SYNC COMMAND...\n");
86 show_free_areas();
87 if(current->pid != 0) {
88 local_irq_enable();
89 sys_sync();
90 local_irq_disable();
91 }
92 prom_printf("Returning to prom\n");
93
94 __asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
95 "nop\n\t"
96 "nop\n\t"
97 "nop\n\t" : : "r" (prom_tbr));
98 local_irq_restore(flags);
99
100 return;
101}
102
103unsigned int boot_flags __initdata = 0;
104#define BOOTME_DEBUG 0x1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106/* Exported for mm/init.c:paging_init. */
107unsigned long cmdline_memory_size __initdata = 0;
108
109static void
110prom_console_write(struct console *con, const char *s, unsigned n)
111{
112 prom_write(s, n);
113}
114
115static struct console prom_debug_console = {
116 .name = "debug",
117 .write = prom_console_write,
118 .flags = CON_PRINTBUFFER,
119 .index = -1,
120};
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122/*
123 * Process kernel command line switches that are specific to the
124 * SPARC or that require special low-level processing.
125 */
126static void __init process_switch(char c)
127{
128 switch (c) {
129 case 'd':
130 boot_flags |= BOOTME_DEBUG;
131 break;
132 case 's':
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 break;
134 case 'h':
135 prom_printf("boot_flags_init: Halt!\n");
136 prom_halt();
137 break;
138 case 'p':
139 /* Use PROM debug console. */
140 register_console(&prom_debug_console);
141 break;
142 default:
143 printk("Unknown boot switch (-%c)\n", c);
144 break;
145 }
146}
147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148static void __init boot_flags_init(char *commands)
149{
150 while (*commands) {
151 /* Move to the start of the next "argument". */
152 while (*commands && *commands == ' ')
153 commands++;
154
155 /* Process any command switches, otherwise skip it. */
156 if (*commands == '\0')
157 break;
158 if (*commands == '-') {
159 commands++;
160 while (*commands && *commands != ' ')
161 process_switch(*commands++);
162 continue;
163 }
David S. Millerc73fcc82007-07-20 16:59:26 -0700164 if (!strncmp(commands, "mem=", 4)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 /*
166 * "mem=XXX[kKmM] overrides the PROM-reported
167 * memory size.
168 */
169 cmdline_memory_size = simple_strtoul(commands + 4,
170 &commands, 0);
171 if (*commands == 'K' || *commands == 'k') {
172 cmdline_memory_size <<= 10;
173 commands++;
174 } else if (*commands=='M' || *commands=='m') {
175 cmdline_memory_size <<= 20;
176 commands++;
177 }
178 }
179 while (*commands && *commands != ' ')
180 commands++;
181 }
182}
183
184/* This routine will in the future do all the nasty prom stuff
185 * to probe for the mmu type and its parameters, etc. This will
186 * also be where SMP things happen plus the Sparc specific memory
187 * physical memory probe as on the alpha.
188 */
189
190extern int prom_probe_memory(void);
191extern void sun4c_probe_vac(void);
192extern char cputypval;
193extern unsigned long start, end;
194extern void panic_setup(char *, int *);
195
196extern unsigned short root_flags;
197extern unsigned short root_dev;
198extern unsigned short ram_flags;
199#define RAMDISK_IMAGE_START_MASK 0x07FF
200#define RAMDISK_PROMPT_FLAG 0x8000
201#define RAMDISK_LOAD_FLAG 0x4000
202
203extern int root_mountflags;
204
205char reboot_command[COMMAND_LINE_SIZE];
206enum sparc_cpu sparc_cpu_model;
207
208struct tt_entry *sparc_ttable;
209
210struct pt_regs fake_swapper_regs;
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212void __init setup_arch(char **cmdline_p)
213{
214 int i;
215 unsigned long highest_paddr;
216
217 sparc_ttable = (struct tt_entry *) &start;
218
219 /* Initialize PROM console and command line. */
220 *cmdline_p = prom_getbootargs();
Alon Bar-Lev08e7ca12007-02-12 00:54:21 -0800221 strcpy(boot_command_line, *cmdline_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 /* Set sparc_cpu_model */
224 sparc_cpu_model = sun_unknown;
225 if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
226 if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
227 if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
228 if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; } /* CP-1200 with PROM 2.30 -E */
229 if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
230 if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
231 if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
232
233#ifdef CONFIG_SUN4
234 if (sparc_cpu_model != sun4) {
235 prom_printf("This kernel is for Sun4 architecture only.\n");
236 prom_halt();
237 }
238#endif
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 default:
260 printk("UNKNOWN!\n");
261 break;
262 };
263
264#ifdef CONFIG_DUMMY_CONSOLE
265 conswitchp = &dummy_con;
266#elif defined(CONFIG_PROM_CONSOLE)
267 conswitchp = &prom_con;
268#endif
269 boot_flags_init(*cmdline_p);
270
271 idprom_init();
272 if (ARCH_SUN4C_SUN4)
273 sun4c_probe_vac();
274 load_mmu();
275 (void) prom_probe_memory();
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);
Al Viro5d2170a2006-06-22 14:47:14 -0700294#ifdef CONFIG_BLK_DEV_RAM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 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();
Krzysztof Helta23b4232006-08-25 00:46:02 -0700312
313 smp_setup_cpu_possible_map();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316extern char *sparc_cpu_type;
317extern char *sparc_fpu_type;
318
Bob Breuera8cbdce2006-06-20 00:28:33 -0700319static int ncpus_probed;
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321static int show_cpuinfo(struct seq_file *m, void *__unused)
322{
323 seq_printf(m,
324 "cpu\t\t: %s\n"
325 "fpu\t\t: %s\n"
326 "promlib\t\t: Version %d Revision %d\n"
327 "prom\t\t: %d.%d\n"
328 "type\t\t: %s\n"
329 "ncpus probed\t: %d\n"
330 "ncpus active\t: %d\n"
331#ifndef CONFIG_SMP
332 "CPU0Bogo\t: %lu.%02lu\n"
333 "CPU0ClkTck\t: %ld\n"
334#endif
335 ,
336 sparc_cpu_type ? sparc_cpu_type : "undetermined",
337 sparc_fpu_type ? sparc_fpu_type : "undetermined",
338 romvec->pv_romvers,
339 prom_rev,
340 romvec->pv_printrev >> 16,
341 romvec->pv_printrev & 0xffff,
342 &cputypval,
Bob Breuera8cbdce2006-06-20 00:28:33 -0700343 ncpus_probed,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 num_online_cpus()
345#ifndef CONFIG_SMP
346 , cpu_data(0).udelay_val/(500000/HZ),
347 (cpu_data(0).udelay_val/(5000/HZ)) % 100,
348 cpu_data(0).clock_tick
349#endif
350 );
351
352#ifdef CONFIG_SMP
353 smp_bogo(m);
354#endif
355 mmu_info(m);
356#ifdef CONFIG_SMP
357 smp_info(m);
358#endif
359 return 0;
360}
361
362static void *c_start(struct seq_file *m, loff_t *pos)
363{
364 /* The pointer we are returning is arbitrary,
365 * it just has to be non-NULL and not IS_ERR
366 * in the success case.
367 */
368 return *pos == 0 ? &c_start : NULL;
369}
370
371static void *c_next(struct seq_file *m, void *v, loff_t *pos)
372{
373 ++*pos;
374 return c_start(m, pos);
375}
376
377static void c_stop(struct seq_file *m, void *v)
378{
379}
380
Jan Engelhardt872e2be2008-01-22 18:29:20 -0800381const struct seq_operations cpuinfo_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 .start =c_start,
383 .next = c_next,
384 .stop = c_stop,
385 .show = show_cpuinfo,
386};
387
388extern int stop_a_enabled;
389
390void sun_do_break(void)
391{
392 if (!stop_a_enabled)
393 return;
394
395 printk("\n");
396 flush_user_windows();
397
398 prom_cmdline();
399}
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401int stop_a_enabled = 1;
Bob Breuera8cbdce2006-06-20 00:28:33 -0700402
403static int __init topology_init(void)
404{
405 int i, ncpus, err;
406
407 /* Count the number of physically present processors in
408 * the machine, even on uniprocessor, so that /proc/cpuinfo
409 * output is consistent with 2.4.x
410 */
411 ncpus = 0;
412 while (!cpu_find_by_instance(ncpus, NULL, NULL))
413 ncpus++;
414 ncpus_probed = ncpus;
415
416 err = 0;
417 for_each_online_cpu(i) {
418 struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
419 if (!p)
420 err = -ENOMEM;
421 else
Andrew Morton94583772006-06-29 02:24:27 -0700422 register_cpu(p, i);
Bob Breuera8cbdce2006-06-20 00:28:33 -0700423 }
424
425 return err;
426}
427
428subsys_initcall(topology_init);