Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * arch/xtensa/kernel/setup.c
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1995 Linus Torvalds
9 * Copyright (C) 2001 - 2005 Tensilica Inc.
10 *
11 * Chris Zankel <chris@zankel.net>
12 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
13 * Kevin Chea
14 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
15 */
16
17#include <linux/errno.h>
18#include <linux/init.h>
19#include <linux/proc_fs.h>
20#include <linux/screen_info.h>
21#include <linux/bootmem.h>
22#include <linux/kernel.h>
23
24#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
25# include <linux/console.h>
26#endif
27
28#ifdef CONFIG_RTC
29# include <linux/timex.h>
30#endif
31
32#ifdef CONFIG_PROC_FS
33# include <linux/seq_file.h>
34#endif
35
36#include <asm/system.h>
37#include <asm/bootparam.h>
38#include <asm/pgtable.h>
39#include <asm/processor.h>
40#include <asm/timex.h>
41#include <asm/platform.h>
42#include <asm/page.h>
43#include <asm/setup.h>
44#include <asm/param.h>
45
46#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
47struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
48#endif
49
50#ifdef CONFIG_BLK_DEV_FD
51extern struct fd_ops no_fd_ops;
52struct fd_ops *fd_ops;
53#endif
54
55#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
56extern struct ide_ops no_ide_ops;
57struct ide_ops *ide_ops;
58#endif
59
60extern struct rtc_ops no_rtc_ops;
61struct rtc_ops *rtc_ops;
62
63#ifdef CONFIG_BLK_DEV_INITRD
64extern void *initrd_start;
65extern void *initrd_end;
66extern void *__initrd_start;
67extern void *__initrd_end;
68int initrd_is_mapped = 0;
69extern int initrd_below_start_ok;
70#endif
71
72unsigned char aux_device_present;
73extern unsigned long loops_per_jiffy;
74
75/* Command line specified as configuration option. */
76
77static char __initdata command_line[COMMAND_LINE_SIZE];
78
79#ifdef CONFIG_CMDLINE_BOOL
80static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
81#endif
82
83sysmem_info_t __initdata sysmem;
84
85#ifdef CONFIG_BLK_DEV_INITRD
86int initrd_is_mapped;
87#endif
88
89extern void init_mmu(void);
90
91/*
92 * Boot parameter parsing.
93 *
94 * The Xtensa port uses a list of variable-sized tags to pass data to
95 * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
96 * to be recognised. The list is terminated with a zero-sized
97 * BP_TAG_LAST tag.
98 */
99
100typedef struct tagtable {
101 u32 tag;
102 int (*parse)(const bp_tag_t*);
103} tagtable_t;
104
105#define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
106 __attribute__((unused, __section__(".taglist"))) = { tag, fn }
107
108/* parse current tag */
109
110static int __init parse_tag_mem(const bp_tag_t *tag)
111{
112 meminfo_t *mi = (meminfo_t*)(tag->data);
113
114 if (mi->type != MEMORY_TYPE_CONVENTIONAL)
115 return -1;
116
117 if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
118 printk(KERN_WARNING
119 "Ignoring memory bank 0x%08lx size %ldKB\n",
120 (unsigned long)mi->start,
121 (unsigned long)mi->end - (unsigned long)mi->start);
122 return -EINVAL;
123 }
124 sysmem.bank[sysmem.nr_banks].type = mi->type;
125 sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
126 sysmem.bank[sysmem.nr_banks].end = mi->end & PAGE_SIZE;
127 sysmem.nr_banks++;
128
129 return 0;
130}
131
132__tagtable(BP_TAG_MEMORY, parse_tag_mem);
133
134#ifdef CONFIG_BLK_DEV_INITRD
135
136static int __init parse_tag_initrd(const bp_tag_t* tag)
137{
138 meminfo_t* mi;
139 mi = (meminfo_t*)(tag->data);
140 initrd_start = (void*)(mi->start);
141 initrd_end = (void*)(mi->end);
142
143 return 0;
144}
145
146__tagtable(BP_TAG_INITRD, parse_tag_initrd);
147
148#endif /* CONFIG_BLK_DEV_INITRD */
149
150static int __init parse_tag_cmdline(const bp_tag_t* tag)
151{
152 strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
153 command_line[COMMAND_LINE_SIZE - 1] = '\0';
154 return 0;
155}
156
157__tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
158
159static int __init parse_bootparam(const bp_tag_t* tag)
160{
161 extern tagtable_t __tagtable_begin, __tagtable_end;
162 tagtable_t *t;
163
164 /* Boot parameters must start with a BP_TAG_FIRST tag. */
165
166 if (tag->id != BP_TAG_FIRST) {
167 printk(KERN_WARNING "Invalid boot parameters!\n");
168 return 0;
169 }
170
171 tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
172
173 /* Parse all tags. */
174
175 while (tag != NULL && tag->id != BP_TAG_LAST) {
176 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
177 if (tag->id == t->tag) {
178 t->parse(tag);
179 break;
180 }
181 }
182 if (t == &__tagtable_end)
183 printk(KERN_WARNING "Ignoring tag "
184 "0x%08x\n", tag->id);
185 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
186 }
187
188 return 0;
189}
190
191/*
192 * Initialize architecture. (Early stage)
193 */
194
195void __init init_arch(bp_tag_t *bp_start)
196{
197
198#ifdef CONFIG_BLK_DEV_INITRD
199 initrd_start = &__initrd_start;
200 initrd_end = &__initrd_end;
201#endif
202
203 sysmem.nr_banks = 0;
204
205#ifdef CONFIG_CMDLINE_BOOL
206 strcpy(command_line, default_command_line);
207#endif
208
209 /* Parse boot parameters */
210
211 if (bp_start)
212 parse_bootparam(bp_start);
213
214 if (sysmem.nr_banks == 0) {
215 sysmem.nr_banks = 1;
216 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
217 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
218 + PLATFORM_DEFAULT_MEM_SIZE;
219 }
220
221 /* Early hook for platforms */
222
223 platform_init(bp_start);
224
225 /* Initialize MMU. */
226
227 init_mmu();
228}
229
230/*
231 * Initialize system. Setup memory and reserve regions.
232 */
233
234extern char _end;
235extern char _stext;
236extern char _WindowVectors_text_start;
237extern char _WindowVectors_text_end;
238extern char _DebugInterruptVector_literal_start;
239extern char _DebugInterruptVector_text_end;
240extern char _KernelExceptionVector_literal_start;
241extern char _KernelExceptionVector_text_end;
242extern char _UserExceptionVector_literal_start;
243extern char _UserExceptionVector_text_end;
244extern char _DoubleExceptionVector_literal_start;
245extern char _DoubleExceptionVector_text_end;
246
247void __init setup_arch(char **cmdline_p)
248{
249 extern int mem_reserve(unsigned long, unsigned long, int);
250 extern void bootmem_init(void);
251
252 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
253 boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
254 *cmdline_p = command_line;
255
256 /* Reserve some memory regions */
257
258#ifdef CONFIG_BLK_DEV_INITRD
259 if (initrd_start < initrd_end) {
260 initrd_is_mapped = mem_reserve(__pa(initrd_start),
261 __pa(initrd_end), 0);
262 initrd_below_start_ok = 1;
263 } else {
264 initrd_start = 0;
265 }
266#endif
267
268 mem_reserve(__pa(&_stext),__pa(&_end), 1);
269
270 mem_reserve(__pa(&_WindowVectors_text_start),
271 __pa(&_WindowVectors_text_end), 0);
272
273 mem_reserve(__pa(&_DebugInterruptVector_literal_start),
274 __pa(&_DebugInterruptVector_text_end), 0);
275
276 mem_reserve(__pa(&_KernelExceptionVector_literal_start),
277 __pa(&_KernelExceptionVector_text_end), 0);
278
279 mem_reserve(__pa(&_UserExceptionVector_literal_start),
280 __pa(&_UserExceptionVector_text_end), 0);
281
282 mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
283 __pa(&_DoubleExceptionVector_text_end), 0);
284
285 bootmem_init();
286
287 platform_setup(cmdline_p);
288
289
290 paging_init();
291
292#ifdef CONFIG_VT
293# if defined(CONFIG_VGA_CONSOLE)
294 conswitchp = &vga_con;
295# elif defined(CONFIG_DUMMY_CONSOLE)
296 conswitchp = &dummy_con;
297# endif
298#endif
299
300#ifdef CONFIG_PCI
301 platform_pcibios_init();
302#endif
303}
304
305void machine_restart(char * cmd)
306{
307 platform_restart();
308}
309
310void machine_halt(void)
311{
312 platform_halt();
313 while (1);
314}
315
316void machine_power_off(void)
317{
318 platform_power_off();
319 while (1);
320}
321#ifdef CONFIG_PROC_FS
322
323/*
324 * Display some core information through /proc/cpuinfo.
325 */
326
327static int
328c_show(struct seq_file *f, void *slot)
329{
330 /* high-level stuff */
331 seq_printf(f,"processor\t: 0\n"
332 "vendor_id\t: Tensilica\n"
333 "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
334 "core ID\t\t: " XCHAL_CORE_ID "\n"
335 "build ID\t: 0x%x\n"
336 "byte order\t: %s\n"
337 "cpu MHz\t\t: %lu.%02lu\n"
338 "bogomips\t: %lu.%02lu\n",
339 XCHAL_BUILD_UNIQUE_ID,
340 XCHAL_HAVE_BE ? "big" : "little",
341 CCOUNT_PER_JIFFY/(1000000/HZ),
342 (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
343 loops_per_jiffy/(500000/HZ),
344 (loops_per_jiffy/(5000/HZ)) % 100);
345
346 seq_printf(f,"flags\t\t: "
347#if XCHAL_HAVE_NMI
348 "nmi "
349#endif
350#if XCHAL_HAVE_DEBUG
351 "debug "
352# if XCHAL_HAVE_OCD
353 "ocd "
354# endif
355#endif
356#if XCHAL_HAVE_DENSITY
357 "density "
358#endif
359#if XCHAL_HAVE_BOOLEANS
360 "boolean "
361#endif
362#if XCHAL_HAVE_LOOPS
363 "loop "
364#endif
365#if XCHAL_HAVE_NSA
366 "nsa "
367#endif
368#if XCHAL_HAVE_MINMAX
369 "minmax "
370#endif
371#if XCHAL_HAVE_SEXT
372 "sext "
373#endif
374#if XCHAL_HAVE_CLAMPS
375 "clamps "
376#endif
377#if XCHAL_HAVE_MAC16
378 "mac16 "
379#endif
380#if XCHAL_HAVE_MUL16
381 "mul16 "
382#endif
383#if XCHAL_HAVE_MUL32
384 "mul32 "
385#endif
386#if XCHAL_HAVE_MUL32_HIGH
387 "mul32h "
388#endif
389#if XCHAL_HAVE_FP
390 "fpu "
391#endif
392 "\n");
393
394 /* Registers. */
395 seq_printf(f,"physical aregs\t: %d\n"
396 "misc regs\t: %d\n"
397 "ibreak\t\t: %d\n"
398 "dbreak\t\t: %d\n",
399 XCHAL_NUM_AREGS,
400 XCHAL_NUM_MISC_REGS,
401 XCHAL_NUM_IBREAK,
402 XCHAL_NUM_DBREAK);
403
404
405 /* Interrupt. */
406 seq_printf(f,"num ints\t: %d\n"
407 "ext ints\t: %d\n"
408 "int levels\t: %d\n"
409 "timers\t\t: %d\n"
410 "debug level\t: %d\n",
411 XCHAL_NUM_INTERRUPTS,
412 XCHAL_NUM_EXTINTERRUPTS,
413 XCHAL_NUM_INTLEVELS,
414 XCHAL_NUM_TIMERS,
415 XCHAL_DEBUGLEVEL);
416
417 /* Cache */
418 seq_printf(f,"icache line size: %d\n"
419 "icache ways\t: %d\n"
420 "icache size\t: %d\n"
421 "icache flags\t: "
422#if XCHAL_ICACHE_LINE_LOCKABLE
423 "lock"
424#endif
425 "\n"
426 "dcache line size: %d\n"
427 "dcache ways\t: %d\n"
428 "dcache size\t: %d\n"
429 "dcache flags\t: "
430#if XCHAL_DCACHE_IS_WRITEBACK
431 "writeback"
432#endif
433#if XCHAL_DCACHE_LINE_LOCKABLE
434 "lock"
435#endif
436 "\n",
437 XCHAL_ICACHE_LINESIZE,
438 XCHAL_ICACHE_WAYS,
439 XCHAL_ICACHE_SIZE,
440 XCHAL_DCACHE_LINESIZE,
441 XCHAL_DCACHE_WAYS,
442 XCHAL_DCACHE_SIZE);
443
444 return 0;
445}
446
447/*
448 * We show only CPU #0 info.
449 */
450static void *
451c_start(struct seq_file *f, loff_t *pos)
452{
453 return (void *) ((*pos == 0) ? (void *)1 : NULL);
454}
455
456static void *
457c_next(struct seq_file *f, void *v, loff_t *pos)
458{
459 return NULL;
460}
461
462static void
463c_stop(struct seq_file *f, void *v)
464{
465}
466
467const struct seq_operations cpuinfo_op =
468{
469 start: c_start,
470 next: c_next,
471 stop: c_stop,
472 show: c_show
473};
474
475#endif /* CONFIG_PROC_FS */
476