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setup.c
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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 <[email protected]>
13  * Kevin Chea
14  * Marc Gauthier<[email protected]> <[email protected]>
15  */
16 
17 #include <linux/errno.h>
18 #include <linux/init.h>
19 #include <linux/mm.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
24 
25 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
26 # include <linux/console.h>
27 #endif
28 
29 #ifdef CONFIG_RTC
30 # include <linux/timex.h>
31 #endif
32 
33 #ifdef CONFIG_PROC_FS
34 # include <linux/seq_file.h>
35 #endif
36 
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 #include <platform/hardware.h>
47 
48 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
49 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
50 #endif
51 
52 #ifdef CONFIG_BLK_DEV_FD
53 extern struct fd_ops no_fd_ops;
54 struct fd_ops *fd_ops;
55 #endif
56 
57 extern struct rtc_ops no_rtc_ops;
58 struct rtc_ops *rtc_ops;
59 
60 #ifdef CONFIG_BLK_DEV_INITRD
61 extern void *initrd_start;
62 extern void *initrd_end;
63 int initrd_is_mapped = 0;
64 extern int initrd_below_start_ok;
65 #endif
66 
67 unsigned char aux_device_present;
68 extern unsigned long loops_per_jiffy;
69 
70 /* Command line specified as configuration option. */
71 
73 
74 #ifdef CONFIG_CMDLINE_BOOL
75 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
76 #endif
77 
79 
80 #ifdef CONFIG_MMU
81 extern void init_mmu(void);
82 #else
83 static inline void init_mmu(void) { }
84 #endif
85 
86 extern void zones_init(void);
87 
88 /*
89  * Boot parameter parsing.
90  *
91  * The Xtensa port uses a list of variable-sized tags to pass data to
92  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
93  * to be recognised. The list is terminated with a zero-sized
94  * BP_TAG_LAST tag.
95  */
96 
97 typedef struct tagtable {
98  u32 tag;
99  int (*parse)(const bp_tag_t*);
100 } tagtable_t;
101 
102 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn \
103  __attribute__((used, section(".taglist"))) = { tag, fn }
104 
105 /* parse current tag */
106 
107 static int __init parse_tag_mem(const bp_tag_t *tag)
108 {
109  meminfo_t *mi = (meminfo_t*)(tag->data);
110 
111  if (mi->type != MEMORY_TYPE_CONVENTIONAL)
112  return -1;
113 
116  "Ignoring memory bank 0x%08lx size %ldKB\n",
117  (unsigned long)mi->start,
118  (unsigned long)mi->end - (unsigned long)mi->start);
119  return -EINVAL;
120  }
124  sysmem.nr_banks++;
125 
126  return 0;
127 }
128 
129 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
130 
131 #ifdef CONFIG_BLK_DEV_INITRD
132 
133 static int __init parse_tag_initrd(const bp_tag_t* tag)
134 {
135  meminfo_t* mi;
136  mi = (meminfo_t*)(tag->data);
137  initrd_start = (void*)(mi->start);
138  initrd_end = (void*)(mi->end);
139 
140  return 0;
141 }
142 
143 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
144 
145 #endif /* CONFIG_BLK_DEV_INITRD */
146 
147 static int __init parse_tag_cmdline(const bp_tag_t* tag)
148 {
149  strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
150  command_line[COMMAND_LINE_SIZE - 1] = '\0';
151  return 0;
152 }
153 
154 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
155 
156 static int __init parse_bootparam(const bp_tag_t* tag)
157 {
158  extern tagtable_t __tagtable_begin, __tagtable_end;
159  tagtable_t *t;
160 
161  /* Boot parameters must start with a BP_TAG_FIRST tag. */
162 
163  if (tag->id != BP_TAG_FIRST) {
164  printk(KERN_WARNING "Invalid boot parameters!\n");
165  return 0;
166  }
167 
168  tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
169 
170  /* Parse all tags. */
171 
172  while (tag != NULL && tag->id != BP_TAG_LAST) {
173  for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
174  if (tag->id == t->tag) {
175  t->parse(tag);
176  break;
177  }
178  }
179  if (t == &__tagtable_end)
180  printk(KERN_WARNING "Ignoring tag "
181  "0x%08x\n", tag->id);
182  tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
183  }
184 
185  return 0;
186 }
187 
188 /*
189  * Initialize architecture. (Early stage)
190  */
191 
192 void __init init_arch(bp_tag_t *bp_start)
193 {
194  sysmem.nr_banks = 0;
195 
196 #ifdef CONFIG_CMDLINE_BOOL
197  strcpy(command_line, default_command_line);
198 #endif
199 
200  /* Parse boot parameters */
201 
202  if (bp_start)
203  parse_bootparam(bp_start);
204 
205  if (sysmem.nr_banks == 0) {
206  sysmem.nr_banks = 1;
210  }
211 
212  /* Early hook for platforms */
213 
214  platform_init(bp_start);
215 
216  /* Initialize MMU. */
217 
218  init_mmu();
219 }
220 
221 /*
222  * Initialize system. Setup memory and reserve regions.
223  */
224 
225 extern char _end;
226 extern char _stext;
227 extern char _WindowVectors_text_start;
228 extern char _WindowVectors_text_end;
237 
238 void __init setup_arch(char **cmdline_p)
239 {
240  extern int mem_reserve(unsigned long, unsigned long, int);
241  extern void bootmem_init(void);
242 
245  *cmdline_p = command_line;
246 
247  /* Reserve some memory regions */
248 
249 #ifdef CONFIG_BLK_DEV_INITRD
250  if (initrd_start < initrd_end) {
251  initrd_is_mapped = mem_reserve(__pa(initrd_start),
252  __pa(initrd_end), 0);
254  } else {
255  initrd_start = 0;
256  }
257 #endif
258 
259  mem_reserve(__pa(&_stext),__pa(&_end), 1);
260 
261  mem_reserve(__pa(&_WindowVectors_text_start),
262  __pa(&_WindowVectors_text_end), 0);
263 
264  mem_reserve(__pa(&_DebugInterruptVector_literal_start),
265  __pa(&_DebugInterruptVector_text_end), 0);
266 
267  mem_reserve(__pa(&_KernelExceptionVector_literal_start),
268  __pa(&_KernelExceptionVector_text_end), 0);
269 
270  mem_reserve(__pa(&_UserExceptionVector_literal_start),
271  __pa(&_UserExceptionVector_text_end), 0);
272 
273  mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
274  __pa(&_DoubleExceptionVector_text_end), 0);
275 
276  bootmem_init();
277 
278  platform_setup(cmdline_p);
279 
280 
281  paging_init();
282  zones_init();
283 
284 #ifdef CONFIG_VT
285 # if defined(CONFIG_VGA_CONSOLE)
286  conswitchp = &vga_con;
287 # elif defined(CONFIG_DUMMY_CONSOLE)
289 # endif
290 #endif
291 
292 #ifdef CONFIG_PCI
294 #endif
295 }
296 
297 void machine_restart(char * cmd)
298 {
300 }
301 
302 void machine_halt(void)
303 {
304  platform_halt();
305  while (1);
306 }
307 
309 {
311  while (1);
312 }
313 #ifdef CONFIG_PROC_FS
314 
315 /*
316  * Display some core information through /proc/cpuinfo.
317  */
318 
319 static int
320 c_show(struct seq_file *f, void *slot)
321 {
322  /* high-level stuff */
323  seq_printf(f,"processor\t: 0\n"
324  "vendor_id\t: Tensilica\n"
325  "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
326  "core ID\t\t: " XCHAL_CORE_ID "\n"
327  "build ID\t: 0x%x\n"
328  "byte order\t: %s\n"
329  "cpu MHz\t\t: %lu.%02lu\n"
330  "bogomips\t: %lu.%02lu\n",
332  XCHAL_HAVE_BE ? "big" : "little",
333  CCOUNT_PER_JIFFY/(1000000/HZ),
334  (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
335  loops_per_jiffy/(500000/HZ),
336  (loops_per_jiffy/(5000/HZ)) % 100);
337 
338  seq_printf(f,"flags\t\t: "
339 #if XCHAL_HAVE_NMI
340  "nmi "
341 #endif
343  "debug "
344 # if XCHAL_HAVE_OCD
345  "ocd "
346 # endif
347 #endif
349  "density "
350 #endif
352  "boolean "
353 #endif
355  "loop "
356 #endif
357 #if XCHAL_HAVE_NSA
358  "nsa "
359 #endif
361  "minmax "
362 #endif
363 #if XCHAL_HAVE_SEXT
364  "sext "
365 #endif
367  "clamps "
368 #endif
370  "mac16 "
371 #endif
373  "mul16 "
374 #endif
376  "mul32 "
377 #endif
379  "mul32h "
380 #endif
381 #if XCHAL_HAVE_FP
382  "fpu "
383 #endif
384  "\n");
385 
386  /* Registers. */
387  seq_printf(f,"physical aregs\t: %d\n"
388  "misc regs\t: %d\n"
389  "ibreak\t\t: %d\n"
390  "dbreak\t\t: %d\n",
395 
396 
397  /* Interrupt. */
398  seq_printf(f,"num ints\t: %d\n"
399  "ext ints\t: %d\n"
400  "int levels\t: %d\n"
401  "timers\t\t: %d\n"
402  "debug level\t: %d\n",
408 
409  /* Cache */
410  seq_printf(f,"icache line size: %d\n"
411  "icache ways\t: %d\n"
412  "icache size\t: %d\n"
413  "icache flags\t: "
415  "lock"
416 #endif
417  "\n"
418  "dcache line size: %d\n"
419  "dcache ways\t: %d\n"
420  "dcache size\t: %d\n"
421  "dcache flags\t: "
423  "writeback"
424 #endif
426  "lock"
427 #endif
428  "\n",
435 
436  return 0;
437 }
438 
439 /*
440  * We show only CPU #0 info.
441  */
442 static void *
443 c_start(struct seq_file *f, loff_t *pos)
444 {
445  return (void *) ((*pos == 0) ? (void *)1 : NULL);
446 }
447 
448 static void *
449 c_next(struct seq_file *f, void *v, loff_t *pos)
450 {
451  return NULL;
452 }
453 
454 static void
455 c_stop(struct seq_file *f, void *v)
456 {
457 }
458 
459 const struct seq_operations cpuinfo_op =
460 {
461  start: c_start,
462  next: c_next,
463  stop: c_stop,
464  show: c_show
465 };
466 
467 #endif /* CONFIG_PROC_FS */
468