setup.c 14 KB

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  1. /*
  2. * arch/sh/kernel/setup.c
  3. *
  4. * This file handles the architecture-dependent parts of initialization
  5. *
  6. * Copyright (C) 1999 Niibe Yutaka
  7. * Copyright (C) 2002 - 2006 Paul Mundt
  8. */
  9. #include <linux/screen_info.h>
  10. #include <linux/ioport.h>
  11. #include <linux/init.h>
  12. #include <linux/initrd.h>
  13. #include <linux/bootmem.h>
  14. #include <linux/console.h>
  15. #include <linux/seq_file.h>
  16. #include <linux/root_dev.h>
  17. #include <linux/utsname.h>
  18. #include <linux/cpu.h>
  19. #include <linux/pfn.h>
  20. #include <linux/fs.h>
  21. #include <asm/uaccess.h>
  22. #include <asm/io.h>
  23. #include <asm/sections.h>
  24. #include <asm/irq.h>
  25. #include <asm/setup.h>
  26. #include <asm/clock.h>
  27. #ifdef CONFIG_SH_KGDB
  28. #include <asm/kgdb.h>
  29. static int kgdb_parse_options(char *options);
  30. #endif
  31. extern void * __rd_start, * __rd_end;
  32. /*
  33. * Machine setup..
  34. */
  35. /*
  36. * Initialize loops_per_jiffy as 10000000 (1000MIPS).
  37. * This value will be used at the very early stage of serial setup.
  38. * The bigger value means no problem.
  39. */
  40. struct sh_cpuinfo boot_cpu_data = { CPU_SH_NONE, 10000000, };
  41. #ifdef CONFIG_VT
  42. struct screen_info screen_info;
  43. #endif
  44. #if defined(CONFIG_SH_UNKNOWN)
  45. struct sh_machine_vector sh_mv;
  46. #endif
  47. extern int root_mountflags;
  48. #define MV_NAME_SIZE 32
  49. static struct sh_machine_vector* __init get_mv_byname(const char* name);
  50. /*
  51. * This is set up by the setup-routine at boot-time
  52. */
  53. #define PARAM ((unsigned char *)empty_zero_page)
  54. #define MOUNT_ROOT_RDONLY (*(unsigned long *) (PARAM+0x000))
  55. #define RAMDISK_FLAGS (*(unsigned long *) (PARAM+0x004))
  56. #define ORIG_ROOT_DEV (*(unsigned long *) (PARAM+0x008))
  57. #define LOADER_TYPE (*(unsigned long *) (PARAM+0x00c))
  58. #define INITRD_START (*(unsigned long *) (PARAM+0x010))
  59. #define INITRD_SIZE (*(unsigned long *) (PARAM+0x014))
  60. /* ... */
  61. #define COMMAND_LINE ((char *) (PARAM+0x100))
  62. #define RAMDISK_IMAGE_START_MASK 0x07FF
  63. #define RAMDISK_PROMPT_FLAG 0x8000
  64. #define RAMDISK_LOAD_FLAG 0x4000
  65. static char __initdata command_line[COMMAND_LINE_SIZE] = { 0, };
  66. static struct resource code_resource = { .name = "Kernel code", };
  67. static struct resource data_resource = { .name = "Kernel data", };
  68. unsigned long memory_start, memory_end;
  69. static inline void parse_cmdline (char ** cmdline_p, char mv_name[MV_NAME_SIZE],
  70. struct sh_machine_vector** mvp,
  71. unsigned long *mv_io_base)
  72. {
  73. char c = ' ', *to = command_line, *from = COMMAND_LINE;
  74. int len = 0;
  75. /* Save unparsed command line copy for /proc/cmdline */
  76. memcpy(boot_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
  77. boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
  78. memory_start = (unsigned long)PAGE_OFFSET+__MEMORY_START;
  79. memory_end = memory_start + __MEMORY_SIZE;
  80. for (;;) {
  81. /*
  82. * "mem=XXX[kKmM]" defines a size of memory.
  83. */
  84. if (c == ' ' && !memcmp(from, "mem=", 4)) {
  85. if (to != command_line)
  86. to--;
  87. {
  88. unsigned long mem_size;
  89. mem_size = memparse(from+4, &from);
  90. memory_end = memory_start + mem_size;
  91. }
  92. }
  93. if (c == ' ' && !memcmp(from, "sh_mv=", 6)) {
  94. char* mv_end;
  95. char* mv_comma;
  96. int mv_len;
  97. if (to != command_line)
  98. to--;
  99. from += 6;
  100. mv_end = strchr(from, ' ');
  101. if (mv_end == NULL)
  102. mv_end = from + strlen(from);
  103. mv_comma = strchr(from, ',');
  104. if ((mv_comma != NULL) && (mv_comma < mv_end)) {
  105. int ints[3];
  106. get_options(mv_comma+1, ARRAY_SIZE(ints), ints);
  107. *mv_io_base = ints[1];
  108. mv_len = mv_comma - from;
  109. } else {
  110. mv_len = mv_end - from;
  111. }
  112. if (mv_len > (MV_NAME_SIZE-1))
  113. mv_len = MV_NAME_SIZE-1;
  114. memcpy(mv_name, from, mv_len);
  115. mv_name[mv_len] = '\0';
  116. from = mv_end;
  117. *mvp = get_mv_byname(mv_name);
  118. }
  119. c = *(from++);
  120. if (!c)
  121. break;
  122. if (COMMAND_LINE_SIZE <= ++len)
  123. break;
  124. *(to++) = c;
  125. }
  126. *to = '\0';
  127. *cmdline_p = command_line;
  128. }
  129. static int __init sh_mv_setup(char **cmdline_p)
  130. {
  131. #ifdef CONFIG_SH_UNKNOWN
  132. extern struct sh_machine_vector mv_unknown;
  133. #endif
  134. struct sh_machine_vector *mv = NULL;
  135. char mv_name[MV_NAME_SIZE] = "";
  136. unsigned long mv_io_base = 0;
  137. parse_cmdline(cmdline_p, mv_name, &mv, &mv_io_base);
  138. #ifdef CONFIG_SH_UNKNOWN
  139. if (mv == NULL) {
  140. mv = &mv_unknown;
  141. if (*mv_name != '\0') {
  142. printk("Warning: Unsupported machine %s, using unknown\n",
  143. mv_name);
  144. }
  145. }
  146. sh_mv = *mv;
  147. #endif
  148. /*
  149. * Manually walk the vec, fill in anything that the board hasn't yet
  150. * by hand, wrapping to the generic implementation.
  151. */
  152. #define mv_set(elem) do { \
  153. if (!sh_mv.mv_##elem) \
  154. sh_mv.mv_##elem = generic_##elem; \
  155. } while (0)
  156. mv_set(inb); mv_set(inw); mv_set(inl);
  157. mv_set(outb); mv_set(outw); mv_set(outl);
  158. mv_set(inb_p); mv_set(inw_p); mv_set(inl_p);
  159. mv_set(outb_p); mv_set(outw_p); mv_set(outl_p);
  160. mv_set(insb); mv_set(insw); mv_set(insl);
  161. mv_set(outsb); mv_set(outsw); mv_set(outsl);
  162. mv_set(readb); mv_set(readw); mv_set(readl);
  163. mv_set(writeb); mv_set(writew); mv_set(writel);
  164. mv_set(ioport_map);
  165. mv_set(ioport_unmap);
  166. mv_set(irq_demux);
  167. #ifdef CONFIG_SH_UNKNOWN
  168. __set_io_port_base(mv_io_base);
  169. #endif
  170. if (!sh_mv.mv_nr_irqs)
  171. sh_mv.mv_nr_irqs = NR_IRQS;
  172. return 0;
  173. }
  174. void __init setup_arch(char **cmdline_p)
  175. {
  176. unsigned long bootmap_size;
  177. unsigned long start_pfn, max_pfn, max_low_pfn;
  178. #ifdef CONFIG_CMDLINE_BOOL
  179. strcpy(COMMAND_LINE, CONFIG_CMDLINE);
  180. #endif
  181. ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
  182. #ifdef CONFIG_BLK_DEV_RAM
  183. rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
  184. rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
  185. rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
  186. #endif
  187. if (!MOUNT_ROOT_RDONLY)
  188. root_mountflags &= ~MS_RDONLY;
  189. init_mm.start_code = (unsigned long) _text;
  190. init_mm.end_code = (unsigned long) _etext;
  191. init_mm.end_data = (unsigned long) _edata;
  192. init_mm.brk = (unsigned long) _end;
  193. code_resource.start = (unsigned long)virt_to_phys(_text);
  194. code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
  195. data_resource.start = (unsigned long)virt_to_phys(_etext);
  196. data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
  197. sh_mv_setup(cmdline_p);
  198. /*
  199. * Find the highest page frame number we have available
  200. */
  201. max_pfn = PFN_DOWN(__pa(memory_end));
  202. /*
  203. * Determine low and high memory ranges:
  204. */
  205. max_low_pfn = max_pfn;
  206. /*
  207. * Partially used pages are not usable - thus
  208. * we are rounding upwards:
  209. */
  210. start_pfn = PFN_UP(__pa(_end));
  211. /*
  212. * Find a proper area for the bootmem bitmap. After this
  213. * bootstrap step all allocations (until the page allocator
  214. * is intact) must be done via bootmem_alloc().
  215. */
  216. bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
  217. __MEMORY_START>>PAGE_SHIFT,
  218. max_low_pfn);
  219. /*
  220. * Register fully available low RAM pages with the bootmem allocator.
  221. */
  222. {
  223. unsigned long curr_pfn, last_pfn, pages;
  224. /*
  225. * We are rounding up the start address of usable memory:
  226. */
  227. curr_pfn = PFN_UP(__MEMORY_START);
  228. /*
  229. * ... and at the end of the usable range downwards:
  230. */
  231. last_pfn = PFN_DOWN(__pa(memory_end));
  232. if (last_pfn > max_low_pfn)
  233. last_pfn = max_low_pfn;
  234. pages = last_pfn - curr_pfn;
  235. free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
  236. PFN_PHYS(pages));
  237. }
  238. /*
  239. * Reserve the kernel text and
  240. * Reserve the bootmem bitmap. We do this in two steps (first step
  241. * was init_bootmem()), because this catches the (definitely buggy)
  242. * case of us accidentally initializing the bootmem allocator with
  243. * an invalid RAM area.
  244. */
  245. reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
  246. (PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
  247. /*
  248. * reserve physical page 0 - it's a special BIOS page on many boxes,
  249. * enabling clean reboots, SMP operation, laptop functions.
  250. */
  251. reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
  252. #ifdef CONFIG_BLK_DEV_INITRD
  253. ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
  254. if (&__rd_start != &__rd_end) {
  255. LOADER_TYPE = 1;
  256. INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
  257. __MEMORY_START;
  258. INITRD_SIZE = (unsigned long)&__rd_end -
  259. (unsigned long)&__rd_start;
  260. }
  261. if (LOADER_TYPE && INITRD_START) {
  262. if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
  263. reserve_bootmem_node(NODE_DATA(0), INITRD_START +
  264. __MEMORY_START, INITRD_SIZE);
  265. initrd_start = INITRD_START + PAGE_OFFSET +
  266. __MEMORY_START;
  267. initrd_end = initrd_start + INITRD_SIZE;
  268. } else {
  269. printk("initrd extends beyond end of memory "
  270. "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
  271. INITRD_START + INITRD_SIZE,
  272. max_low_pfn << PAGE_SHIFT);
  273. initrd_start = 0;
  274. }
  275. }
  276. #endif
  277. #ifdef CONFIG_DUMMY_CONSOLE
  278. conswitchp = &dummy_con;
  279. #endif
  280. /* Perform the machine specific initialisation */
  281. if (likely(sh_mv.mv_setup))
  282. sh_mv.mv_setup(cmdline_p);
  283. paging_init();
  284. }
  285. struct sh_machine_vector* __init get_mv_byname(const char* name)
  286. {
  287. extern long __machvec_start, __machvec_end;
  288. struct sh_machine_vector *all_vecs =
  289. (struct sh_machine_vector *)&__machvec_start;
  290. int i, n = ((unsigned long)&__machvec_end
  291. - (unsigned long)&__machvec_start)/
  292. sizeof(struct sh_machine_vector);
  293. for (i = 0; i < n; ++i) {
  294. struct sh_machine_vector *mv = &all_vecs[i];
  295. if (mv == NULL)
  296. continue;
  297. if (strcasecmp(name, get_system_type()) == 0) {
  298. return mv;
  299. }
  300. }
  301. return NULL;
  302. }
  303. static struct cpu cpu[NR_CPUS];
  304. static int __init topology_init(void)
  305. {
  306. int cpu_id;
  307. for_each_possible_cpu(cpu_id)
  308. register_cpu(&cpu[cpu_id], cpu_id);
  309. return 0;
  310. }
  311. subsys_initcall(topology_init);
  312. static const char *cpu_name[] = {
  313. [CPU_SH7206] = "SH7206", [CPU_SH7619] = "SH7619",
  314. [CPU_SH7604] = "SH7604", [CPU_SH7300] = "SH7300",
  315. [CPU_SH7705] = "SH7705", [CPU_SH7706] = "SH7706",
  316. [CPU_SH7707] = "SH7707", [CPU_SH7708] = "SH7708",
  317. [CPU_SH7709] = "SH7709", [CPU_SH7710] = "SH7710",
  318. [CPU_SH7729] = "SH7729", [CPU_SH7750] = "SH7750",
  319. [CPU_SH7750S] = "SH7750S", [CPU_SH7750R] = "SH7750R",
  320. [CPU_SH7751] = "SH7751", [CPU_SH7751R] = "SH7751R",
  321. [CPU_SH7760] = "SH7760", [CPU_SH73180] = "SH73180",
  322. [CPU_ST40RA] = "ST40RA", [CPU_ST40GX1] = "ST40GX1",
  323. [CPU_SH4_202] = "SH4-202", [CPU_SH4_501] = "SH4-501",
  324. [CPU_SH7770] = "SH7770", [CPU_SH7780] = "SH7780",
  325. [CPU_SH7781] = "SH7781", [CPU_SH7343] = "SH7343",
  326. [CPU_SH7785] = "SH7785", [CPU_SH7722] = "SH7722",
  327. [CPU_SH_NONE] = "Unknown"
  328. };
  329. const char *get_cpu_subtype(struct sh_cpuinfo *c)
  330. {
  331. return cpu_name[c->type];
  332. }
  333. #ifdef CONFIG_PROC_FS
  334. /* Symbolic CPU flags, keep in sync with asm/cpu-features.h */
  335. static const char *cpu_flags[] = {
  336. "none", "fpu", "p2flush", "mmuassoc", "dsp", "perfctr",
  337. "ptea", "llsc", "l2", NULL
  338. };
  339. static void show_cpuflags(struct seq_file *m, struct sh_cpuinfo *c)
  340. {
  341. unsigned long i;
  342. seq_printf(m, "cpu flags\t:");
  343. if (!c->flags) {
  344. seq_printf(m, " %s\n", cpu_flags[0]);
  345. return;
  346. }
  347. for (i = 0; cpu_flags[i]; i++)
  348. if ((c->flags & (1 << i)))
  349. seq_printf(m, " %s", cpu_flags[i+1]);
  350. seq_printf(m, "\n");
  351. }
  352. static void show_cacheinfo(struct seq_file *m, const char *type,
  353. struct cache_info info)
  354. {
  355. unsigned int cache_size;
  356. cache_size = info.ways * info.sets * info.linesz;
  357. seq_printf(m, "%s size\t: %2dKiB (%d-way)\n",
  358. type, cache_size >> 10, info.ways);
  359. }
  360. /*
  361. * Get CPU information for use by the procfs.
  362. */
  363. static int show_cpuinfo(struct seq_file *m, void *v)
  364. {
  365. struct sh_cpuinfo *c = v;
  366. unsigned int cpu = c - cpu_data;
  367. if (!cpu_online(cpu))
  368. return 0;
  369. if (cpu == 0)
  370. seq_printf(m, "machine\t\t: %s\n", get_system_type());
  371. seq_printf(m, "processor\t: %d\n", cpu);
  372. seq_printf(m, "cpu family\t: %s\n", init_utsname()->machine);
  373. seq_printf(m, "cpu type\t: %s\n", get_cpu_subtype(c));
  374. show_cpuflags(m, c);
  375. seq_printf(m, "cache type\t: ");
  376. /*
  377. * Check for what type of cache we have, we support both the
  378. * unified cache on the SH-2 and SH-3, as well as the harvard
  379. * style cache on the SH-4.
  380. */
  381. if (c->icache.flags & SH_CACHE_COMBINED) {
  382. seq_printf(m, "unified\n");
  383. show_cacheinfo(m, "cache", c->icache);
  384. } else {
  385. seq_printf(m, "split (harvard)\n");
  386. show_cacheinfo(m, "icache", c->icache);
  387. show_cacheinfo(m, "dcache", c->dcache);
  388. }
  389. /* Optional secondary cache */
  390. if (c->flags & CPU_HAS_L2_CACHE)
  391. show_cacheinfo(m, "scache", c->scache);
  392. seq_printf(m, "bogomips\t: %lu.%02lu\n",
  393. c->loops_per_jiffy/(500000/HZ),
  394. (c->loops_per_jiffy/(5000/HZ)) % 100);
  395. return show_clocks(m);
  396. }
  397. static void *c_start(struct seq_file *m, loff_t *pos)
  398. {
  399. return *pos < NR_CPUS ? cpu_data + *pos : NULL;
  400. }
  401. static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  402. {
  403. ++*pos;
  404. return c_start(m, pos);
  405. }
  406. static void c_stop(struct seq_file *m, void *v)
  407. {
  408. }
  409. struct seq_operations cpuinfo_op = {
  410. .start = c_start,
  411. .next = c_next,
  412. .stop = c_stop,
  413. .show = show_cpuinfo,
  414. };
  415. #endif /* CONFIG_PROC_FS */
  416. #ifdef CONFIG_SH_KGDB
  417. /*
  418. * Parse command-line kgdb options. By default KGDB is enabled,
  419. * entered on error (or other action) using default serial info.
  420. * The command-line option can include a serial port specification
  421. * and an action to override default or configured behavior.
  422. */
  423. struct kgdb_sermap kgdb_sci_sermap =
  424. { "ttySC", 5, kgdb_sci_setup, NULL };
  425. struct kgdb_sermap *kgdb_serlist = &kgdb_sci_sermap;
  426. struct kgdb_sermap *kgdb_porttype = &kgdb_sci_sermap;
  427. void kgdb_register_sermap(struct kgdb_sermap *map)
  428. {
  429. struct kgdb_sermap *last;
  430. for (last = kgdb_serlist; last->next; last = last->next)
  431. ;
  432. last->next = map;
  433. if (!map->namelen) {
  434. map->namelen = strlen(map->name);
  435. }
  436. }
  437. static int __init kgdb_parse_options(char *options)
  438. {
  439. char c;
  440. int baud;
  441. /* Check for port spec (or use default) */
  442. /* Determine port type and instance */
  443. if (!memcmp(options, "tty", 3)) {
  444. struct kgdb_sermap *map = kgdb_serlist;
  445. while (map && memcmp(options, map->name, map->namelen))
  446. map = map->next;
  447. if (!map) {
  448. KGDB_PRINTK("unknown port spec in %s\n", options);
  449. return -1;
  450. }
  451. kgdb_porttype = map;
  452. kgdb_serial_setup = map->setup_fn;
  453. kgdb_portnum = options[map->namelen] - '0';
  454. options += map->namelen + 1;
  455. options = (*options == ',') ? options+1 : options;
  456. /* Read optional parameters (baud/parity/bits) */
  457. baud = simple_strtoul(options, &options, 10);
  458. if (baud != 0) {
  459. kgdb_baud = baud;
  460. c = toupper(*options);
  461. if (c == 'E' || c == 'O' || c == 'N') {
  462. kgdb_parity = c;
  463. options++;
  464. }
  465. c = *options;
  466. if (c == '7' || c == '8') {
  467. kgdb_bits = c;
  468. options++;
  469. }
  470. options = (*options == ',') ? options+1 : options;
  471. }
  472. }
  473. /* Check for action specification */
  474. if (!memcmp(options, "halt", 4)) {
  475. kgdb_halt = 1;
  476. options += 4;
  477. } else if (!memcmp(options, "disabled", 8)) {
  478. kgdb_enabled = 0;
  479. options += 8;
  480. }
  481. if (*options) {
  482. KGDB_PRINTK("ignored unknown options: %s\n", options);
  483. return 0;
  484. }
  485. return 1;
  486. }
  487. __setup("kgdb=", kgdb_parse_options);
  488. #endif /* CONFIG_SH_KGDB */