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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1995 Linus Torvalds | |
7 | * Copyright (C) 1995 Waldorf Electronics | |
8 | * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle | |
9 | * Copyright (C) 1996 Stoned Elipot | |
10 | * Copyright (C) 1999 Silicon Graphics, Inc. | |
11 | * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki | |
12 | */ | |
13 | #include <linux/config.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/stddef.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/user.h> | |
26 | #include <linux/utsname.h> | |
27 | #include <linux/a.out.h> | |
28 | #include <linux/tty.h> | |
29 | #include <linux/bootmem.h> | |
30 | #include <linux/initrd.h> | |
31 | #include <linux/major.h> | |
32 | #include <linux/kdev_t.h> | |
33 | #include <linux/root_dev.h> | |
34 | #include <linux/highmem.h> | |
35 | #include <linux/console.h> | |
b4819b59 | 36 | #include <linux/mmzone.h> |
22a9835c | 37 | #include <linux/pfn.h> |
1da177e4 LT |
38 | |
39 | #include <asm/addrspace.h> | |
40 | #include <asm/bootinfo.h> | |
ec74e361 | 41 | #include <asm/cache.h> |
1da177e4 LT |
42 | #include <asm/cpu.h> |
43 | #include <asm/sections.h> | |
44 | #include <asm/setup.h> | |
45 | #include <asm/system.h> | |
46 | ||
ec74e361 | 47 | struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; |
1da177e4 LT |
48 | |
49 | EXPORT_SYMBOL(cpu_data); | |
50 | ||
51 | #ifdef CONFIG_VT | |
52 | struct screen_info screen_info; | |
53 | #endif | |
54 | ||
55 | /* | |
56 | * Despite it's name this variable is even if we don't have PCI | |
57 | */ | |
58 | unsigned int PCI_DMA_BUS_IS_PHYS; | |
59 | ||
60 | EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); | |
61 | ||
62 | /* | |
63 | * Setup information | |
64 | * | |
65 | * These are initialized so they are in the .data section | |
66 | */ | |
ec74e361 RB |
67 | unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; |
68 | unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; | |
1da177e4 LT |
69 | |
70 | EXPORT_SYMBOL(mips_machtype); | |
71 | EXPORT_SYMBOL(mips_machgroup); | |
72 | ||
73 | struct boot_mem_map boot_mem_map; | |
74 | ||
75 | static char command_line[CL_SIZE]; | |
76 | char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; | |
77 | ||
78 | /* | |
79 | * mips_io_port_base is the begin of the address space to which x86 style | |
80 | * I/O ports are mapped. | |
81 | */ | |
ec74e361 | 82 | const unsigned long mips_io_port_base __read_mostly = -1; |
1da177e4 LT |
83 | EXPORT_SYMBOL(mips_io_port_base); |
84 | ||
85 | /* | |
86 | * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped | |
87 | * for the processor. | |
88 | */ | |
89 | unsigned long isa_slot_offset; | |
90 | EXPORT_SYMBOL(isa_slot_offset); | |
91 | ||
92 | static struct resource code_resource = { .name = "Kernel code", }; | |
93 | static struct resource data_resource = { .name = "Kernel data", }; | |
94 | ||
95 | void __init add_memory_region(phys_t start, phys_t size, long type) | |
96 | { | |
97 | int x = boot_mem_map.nr_map; | |
98 | struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; | |
99 | ||
100 | /* | |
101 | * Try to merge with previous entry if any. This is far less than | |
102 | * perfect but is sufficient for most real world cases. | |
103 | */ | |
104 | if (x && prev->addr + prev->size == start && prev->type == type) { | |
105 | prev->size += size; | |
106 | return; | |
107 | } | |
108 | ||
109 | if (x == BOOT_MEM_MAP_MAX) { | |
110 | printk("Ooops! Too many entries in the memory map!\n"); | |
111 | return; | |
112 | } | |
113 | ||
114 | boot_mem_map.map[x].addr = start; | |
115 | boot_mem_map.map[x].size = size; | |
116 | boot_mem_map.map[x].type = type; | |
117 | boot_mem_map.nr_map++; | |
118 | } | |
119 | ||
120 | static void __init print_memory_map(void) | |
121 | { | |
122 | int i; | |
123 | const int field = 2 * sizeof(unsigned long); | |
124 | ||
125 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
126 | printk(" memory: %0*Lx @ %0*Lx ", | |
127 | field, (unsigned long long) boot_mem_map.map[i].size, | |
128 | field, (unsigned long long) boot_mem_map.map[i].addr); | |
129 | ||
130 | switch (boot_mem_map.map[i].type) { | |
131 | case BOOT_MEM_RAM: | |
132 | printk("(usable)\n"); | |
133 | break; | |
134 | case BOOT_MEM_ROM_DATA: | |
135 | printk("(ROM data)\n"); | |
136 | break; | |
137 | case BOOT_MEM_RESERVED: | |
138 | printk("(reserved)\n"); | |
139 | break; | |
140 | default: | |
141 | printk("type %lu\n", boot_mem_map.map[i].type); | |
142 | break; | |
143 | } | |
144 | } | |
145 | } | |
146 | ||
147 | static inline void parse_cmdline_early(void) | |
148 | { | |
149 | char c = ' ', *to = command_line, *from = saved_command_line; | |
150 | unsigned long start_at, mem_size; | |
151 | int len = 0; | |
152 | int usermem = 0; | |
153 | ||
154 | printk("Determined physical RAM map:\n"); | |
155 | print_memory_map(); | |
156 | ||
157 | for (;;) { | |
158 | /* | |
159 | * "mem=XXX[kKmM]" defines a memory region from | |
160 | * 0 to <XXX>, overriding the determined size. | |
161 | * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from | |
162 | * <YYY> to <YYY>+<XXX>, overriding the determined size. | |
163 | */ | |
164 | if (c == ' ' && !memcmp(from, "mem=", 4)) { | |
165 | if (to != command_line) | |
166 | to--; | |
167 | /* | |
168 | * If a user specifies memory size, we | |
169 | * blow away any automatically generated | |
170 | * size. | |
171 | */ | |
172 | if (usermem == 0) { | |
173 | boot_mem_map.nr_map = 0; | |
174 | usermem = 1; | |
175 | } | |
176 | mem_size = memparse(from + 4, &from); | |
177 | if (*from == '@') | |
178 | start_at = memparse(from + 1, &from); | |
179 | else | |
180 | start_at = 0; | |
181 | add_memory_region(start_at, mem_size, BOOT_MEM_RAM); | |
182 | } | |
183 | c = *(from++); | |
184 | if (!c) | |
185 | break; | |
186 | if (CL_SIZE <= ++len) | |
187 | break; | |
188 | *(to++) = c; | |
189 | } | |
190 | *to = '\0'; | |
191 | ||
192 | if (usermem) { | |
193 | printk("User-defined physical RAM map:\n"); | |
194 | print_memory_map(); | |
195 | } | |
196 | } | |
197 | ||
198 | static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) | |
199 | { | |
200 | /* | |
201 | * "rd_start=0xNNNNNNNN" defines the memory address of an initrd | |
202 | * "rd_size=0xNN" it's size | |
203 | */ | |
204 | unsigned long start = 0; | |
205 | unsigned long size = 0; | |
206 | unsigned long end; | |
207 | char cmd_line[CL_SIZE]; | |
208 | char *start_str; | |
209 | char *size_str; | |
210 | char *tmp; | |
211 | ||
212 | strcpy(cmd_line, command_line); | |
213 | *command_line = 0; | |
214 | tmp = cmd_line; | |
215 | /* Ignore "rd_start=" strings in other parameters. */ | |
216 | start_str = strstr(cmd_line, "rd_start="); | |
217 | if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') | |
218 | start_str = strstr(start_str, " rd_start="); | |
219 | while (start_str) { | |
220 | if (start_str != cmd_line) | |
221 | strncat(command_line, tmp, start_str - tmp); | |
222 | start = memparse(start_str + 9, &start_str); | |
223 | tmp = start_str + 1; | |
224 | start_str = strstr(start_str, " rd_start="); | |
225 | } | |
226 | if (*tmp) | |
227 | strcat(command_line, tmp); | |
228 | ||
229 | strcpy(cmd_line, command_line); | |
230 | *command_line = 0; | |
231 | tmp = cmd_line; | |
232 | /* Ignore "rd_size" strings in other parameters. */ | |
233 | size_str = strstr(cmd_line, "rd_size="); | |
234 | if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') | |
235 | size_str = strstr(size_str, " rd_size="); | |
236 | while (size_str) { | |
237 | if (size_str != cmd_line) | |
238 | strncat(command_line, tmp, size_str - tmp); | |
239 | size = memparse(size_str + 8, &size_str); | |
240 | tmp = size_str + 1; | |
241 | size_str = strstr(size_str, " rd_size="); | |
242 | } | |
243 | if (*tmp) | |
244 | strcat(command_line, tmp); | |
245 | ||
875d43e7 | 246 | #ifdef CONFIG_64BIT |
1da177e4 LT |
247 | /* HACK: Guess if the sign extension was forgotten */ |
248 | if (start > 0x0000000080000000 && start < 0x00000000ffffffff) | |
460c0422 | 249 | start |= 0xffffffff00000000UL; |
1da177e4 LT |
250 | #endif |
251 | ||
252 | end = start + size; | |
253 | if (start && end) { | |
254 | *rd_start = start; | |
255 | *rd_end = end; | |
256 | return 1; | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | #define MAXMEM HIGHMEM_START |
262 | #define MAXMEM_PFN PFN_DOWN(MAXMEM) | |
263 | ||
264 | static inline void bootmem_init(void) | |
265 | { | |
266 | unsigned long start_pfn; | |
267 | unsigned long reserved_end = (unsigned long)&_end; | |
268 | #ifndef CONFIG_SGI_IP27 | |
269 | unsigned long first_usable_pfn; | |
270 | unsigned long bootmap_size; | |
271 | int i; | |
272 | #endif | |
273 | #ifdef CONFIG_BLK_DEV_INITRD | |
274 | int initrd_reserve_bootmem = 0; | |
275 | ||
276 | /* Board specific code should have set up initrd_start and initrd_end */ | |
277 | ROOT_DEV = Root_RAM0; | |
278 | if (parse_rd_cmdline(&initrd_start, &initrd_end)) { | |
279 | reserved_end = max(reserved_end, initrd_end); | |
280 | initrd_reserve_bootmem = 1; | |
281 | } else { | |
282 | unsigned long tmp; | |
283 | u32 *initrd_header; | |
284 | ||
285 | tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; | |
286 | if (tmp < reserved_end) | |
287 | tmp += PAGE_SIZE; | |
288 | initrd_header = (u32 *)tmp; | |
289 | if (initrd_header[0] == 0x494E5244) { | |
290 | initrd_start = (unsigned long)&initrd_header[2]; | |
291 | initrd_end = initrd_start + initrd_header[1]; | |
292 | reserved_end = max(reserved_end, initrd_end); | |
293 | initrd_reserve_bootmem = 1; | |
294 | } | |
295 | } | |
296 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
297 | ||
298 | /* | |
299 | * Partially used pages are not usable - thus | |
300 | * we are rounding upwards. | |
301 | */ | |
302 | start_pfn = PFN_UP(CPHYSADDR(reserved_end)); | |
303 | ||
304 | #ifndef CONFIG_SGI_IP27 | |
305 | /* Find the highest page frame number we have available. */ | |
306 | max_pfn = 0; | |
307 | first_usable_pfn = -1UL; | |
308 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
309 | unsigned long start, end; | |
310 | ||
311 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
312 | continue; | |
313 | ||
314 | start = PFN_UP(boot_mem_map.map[i].addr); | |
315 | end = PFN_DOWN(boot_mem_map.map[i].addr | |
316 | + boot_mem_map.map[i].size); | |
317 | ||
318 | if (start >= end) | |
319 | continue; | |
320 | if (end > max_pfn) | |
321 | max_pfn = end; | |
322 | if (start < first_usable_pfn) { | |
323 | if (start > start_pfn) { | |
324 | first_usable_pfn = start; | |
325 | } else if (end > start_pfn) { | |
326 | first_usable_pfn = start_pfn; | |
327 | } | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | * Determine low and high memory ranges | |
333 | */ | |
334 | max_low_pfn = max_pfn; | |
335 | if (max_low_pfn > MAXMEM_PFN) { | |
336 | max_low_pfn = MAXMEM_PFN; | |
337 | #ifndef CONFIG_HIGHMEM | |
338 | /* Maximum memory usable is what is directly addressable */ | |
339 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
340 | MAXMEM >> 20); | |
341 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
342 | #endif | |
343 | } | |
344 | ||
345 | #ifdef CONFIG_HIGHMEM | |
346 | /* | |
347 | * Crude, we really should make a better attempt at detecting | |
348 | * highstart_pfn | |
349 | */ | |
350 | highstart_pfn = highend_pfn = max_pfn; | |
351 | if (max_pfn > MAXMEM_PFN) { | |
352 | highstart_pfn = MAXMEM_PFN; | |
353 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", | |
354 | (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); | |
355 | } | |
356 | #endif | |
357 | ||
b4819b59 YY |
358 | memory_present(0, first_usable_pfn, max_low_pfn); |
359 | ||
1da177e4 LT |
360 | /* Initialize the boot-time allocator with low memory only. */ |
361 | bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); | |
362 | ||
363 | /* | |
364 | * Register fully available low RAM pages with the bootmem allocator. | |
365 | */ | |
366 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
367 | unsigned long curr_pfn, last_pfn, size; | |
368 | ||
369 | /* | |
370 | * Reserve usable memory. | |
371 | */ | |
372 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
373 | continue; | |
374 | ||
375 | /* | |
376 | * We are rounding up the start address of usable memory: | |
377 | */ | |
378 | curr_pfn = PFN_UP(boot_mem_map.map[i].addr); | |
379 | if (curr_pfn >= max_low_pfn) | |
380 | continue; | |
381 | if (curr_pfn < start_pfn) | |
382 | curr_pfn = start_pfn; | |
383 | ||
384 | /* | |
385 | * ... and at the end of the usable range downwards: | |
386 | */ | |
387 | last_pfn = PFN_DOWN(boot_mem_map.map[i].addr | |
388 | + boot_mem_map.map[i].size); | |
389 | ||
390 | if (last_pfn > max_low_pfn) | |
391 | last_pfn = max_low_pfn; | |
392 | ||
393 | /* | |
394 | * Only register lowmem part of lowmem segment with bootmem. | |
395 | */ | |
396 | size = last_pfn - curr_pfn; | |
397 | if (curr_pfn > PFN_DOWN(HIGHMEM_START)) | |
398 | continue; | |
399 | if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) | |
400 | size = PFN_DOWN(HIGHMEM_START) - curr_pfn; | |
401 | if (!size) | |
402 | continue; | |
403 | ||
404 | /* | |
405 | * ... finally, did all the rounding and playing | |
406 | * around just make the area go away? | |
407 | */ | |
408 | if (last_pfn <= curr_pfn) | |
409 | continue; | |
410 | ||
411 | /* Register lowmem ranges */ | |
412 | free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); | |
413 | } | |
414 | ||
415 | /* Reserve the bootmap memory. */ | |
416 | reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); | |
417 | #endif /* CONFIG_SGI_IP27 */ | |
418 | ||
419 | #ifdef CONFIG_BLK_DEV_INITRD | |
420 | initrd_below_start_ok = 1; | |
421 | if (initrd_start) { | |
ecf52d3c AN |
422 | unsigned long initrd_size = ((unsigned char *)initrd_end) - |
423 | ((unsigned char *)initrd_start); | |
424 | const int width = sizeof(long) * 2; | |
425 | ||
1da177e4 LT |
426 | printk("Initial ramdisk at: 0x%p (%lu bytes)\n", |
427 | (void *)initrd_start, initrd_size); | |
428 | ||
429 | if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { | |
430 | printk("initrd extends beyond end of memory " | |
431 | "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", | |
ecf52d3c AN |
432 | width, |
433 | (unsigned long long) CPHYSADDR(initrd_end), | |
434 | width, | |
435 | (unsigned long long) PFN_PHYS(max_low_pfn)); | |
1da177e4 LT |
436 | initrd_start = initrd_end = 0; |
437 | initrd_reserve_bootmem = 0; | |
438 | } | |
439 | ||
440 | if (initrd_reserve_bootmem) | |
441 | reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); | |
442 | } | |
443 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
444 | } | |
445 | ||
446 | static inline void resource_init(void) | |
447 | { | |
448 | int i; | |
449 | ||
1da177e4 LT |
450 | code_resource.start = virt_to_phys(&_text); |
451 | code_resource.end = virt_to_phys(&_etext) - 1; | |
452 | data_resource.start = virt_to_phys(&_etext); | |
453 | data_resource.end = virt_to_phys(&_edata) - 1; | |
1da177e4 LT |
454 | |
455 | /* | |
456 | * Request address space for all standard RAM. | |
457 | */ | |
458 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
459 | struct resource *res; | |
460 | unsigned long start, end; | |
461 | ||
462 | start = boot_mem_map.map[i].addr; | |
463 | end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; | |
464 | if (start >= MAXMEM) | |
465 | continue; | |
466 | if (end >= MAXMEM) | |
467 | end = MAXMEM - 1; | |
468 | ||
469 | res = alloc_bootmem(sizeof(struct resource)); | |
470 | switch (boot_mem_map.map[i].type) { | |
471 | case BOOT_MEM_RAM: | |
472 | case BOOT_MEM_ROM_DATA: | |
473 | res->name = "System RAM"; | |
474 | break; | |
475 | case BOOT_MEM_RESERVED: | |
476 | default: | |
477 | res->name = "reserved"; | |
478 | } | |
479 | ||
480 | res->start = start; | |
481 | res->end = end; | |
482 | ||
483 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
484 | request_resource(&iomem_resource, res); | |
485 | ||
486 | /* | |
487 | * We don't know which RAM region contains kernel data, | |
488 | * so we try it repeatedly and let the resource manager | |
489 | * test it. | |
490 | */ | |
491 | request_resource(res, &code_resource); | |
492 | request_resource(res, &data_resource); | |
493 | } | |
494 | } | |
495 | ||
1da177e4 LT |
496 | #undef MAXMEM |
497 | #undef MAXMEM_PFN | |
498 | ||
c83cfc9c | 499 | extern void plat_setup(void); |
1da177e4 LT |
500 | |
501 | void __init setup_arch(char **cmdline_p) | |
502 | { | |
503 | cpu_probe(); | |
504 | prom_init(); | |
505 | cpu_report(); | |
506 | ||
507 | #if defined(CONFIG_VT) | |
508 | #if defined(CONFIG_VGA_CONSOLE) | |
509 | conswitchp = &vga_con; | |
510 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
511 | conswitchp = &dummy_con; | |
512 | #endif | |
513 | #endif | |
514 | ||
515 | /* call board setup routine */ | |
c83cfc9c | 516 | plat_setup(); |
1da177e4 LT |
517 | |
518 | strlcpy(command_line, arcs_cmdline, sizeof(command_line)); | |
519 | strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); | |
520 | ||
521 | *cmdline_p = command_line; | |
522 | ||
523 | parse_cmdline_early(); | |
524 | bootmem_init(); | |
b4819b59 | 525 | sparse_init(); |
1da177e4 LT |
526 | paging_init(); |
527 | resource_init(); | |
9b6695a8 RB |
528 | #ifdef CONFIG_SMP |
529 | plat_smp_setup(); | |
530 | #endif | |
1da177e4 LT |
531 | } |
532 | ||
533 | int __init fpu_disable(char *s) | |
534 | { | |
f088fc84 RB |
535 | int i; |
536 | ||
537 | for (i = 0; i < NR_CPUS; i++) | |
538 | cpu_data[i].options &= ~MIPS_CPU_FPU; | |
1da177e4 LT |
539 | |
540 | return 1; | |
541 | } | |
542 | ||
543 | __setup("nofpu", fpu_disable); | |
e50c0a8f RB |
544 | |
545 | int __init dsp_disable(char *s) | |
546 | { | |
547 | cpu_data[0].ases &= ~MIPS_ASE_DSP; | |
548 | ||
549 | return 1; | |
550 | } | |
551 | ||
552 | __setup("nodsp", dsp_disable); |