]>
Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
37 | |
38 | #include <asm/addrspace.h> | |
39 | #include <asm/bootinfo.h> | |
40 | #include <asm/cpu.h> | |
41 | #include <asm/sections.h> | |
42 | #include <asm/setup.h> | |
43 | #include <asm/system.h> | |
44 | ||
45 | struct cpuinfo_mips cpu_data[NR_CPUS]; | |
46 | ||
47 | EXPORT_SYMBOL(cpu_data); | |
48 | ||
49 | #ifdef CONFIG_VT | |
50 | struct screen_info screen_info; | |
51 | #endif | |
52 | ||
53 | /* | |
54 | * Despite it's name this variable is even if we don't have PCI | |
55 | */ | |
56 | unsigned int PCI_DMA_BUS_IS_PHYS; | |
57 | ||
58 | EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); | |
59 | ||
60 | /* | |
61 | * Setup information | |
62 | * | |
63 | * These are initialized so they are in the .data section | |
64 | */ | |
65 | unsigned long mips_machtype = MACH_UNKNOWN; | |
66 | unsigned long mips_machgroup = MACH_GROUP_UNKNOWN; | |
67 | ||
68 | EXPORT_SYMBOL(mips_machtype); | |
69 | EXPORT_SYMBOL(mips_machgroup); | |
70 | ||
71 | struct boot_mem_map boot_mem_map; | |
72 | ||
73 | static char command_line[CL_SIZE]; | |
74 | char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; | |
75 | ||
76 | /* | |
77 | * mips_io_port_base is the begin of the address space to which x86 style | |
78 | * I/O ports are mapped. | |
79 | */ | |
80 | const unsigned long mips_io_port_base = -1; | |
81 | EXPORT_SYMBOL(mips_io_port_base); | |
82 | ||
83 | /* | |
84 | * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped | |
85 | * for the processor. | |
86 | */ | |
87 | unsigned long isa_slot_offset; | |
88 | EXPORT_SYMBOL(isa_slot_offset); | |
89 | ||
90 | static struct resource code_resource = { .name = "Kernel code", }; | |
91 | static struct resource data_resource = { .name = "Kernel data", }; | |
92 | ||
93 | void __init add_memory_region(phys_t start, phys_t size, long type) | |
94 | { | |
95 | int x = boot_mem_map.nr_map; | |
96 | struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; | |
97 | ||
98 | /* | |
99 | * Try to merge with previous entry if any. This is far less than | |
100 | * perfect but is sufficient for most real world cases. | |
101 | */ | |
102 | if (x && prev->addr + prev->size == start && prev->type == type) { | |
103 | prev->size += size; | |
104 | return; | |
105 | } | |
106 | ||
107 | if (x == BOOT_MEM_MAP_MAX) { | |
108 | printk("Ooops! Too many entries in the memory map!\n"); | |
109 | return; | |
110 | } | |
111 | ||
112 | boot_mem_map.map[x].addr = start; | |
113 | boot_mem_map.map[x].size = size; | |
114 | boot_mem_map.map[x].type = type; | |
115 | boot_mem_map.nr_map++; | |
116 | } | |
117 | ||
118 | static void __init print_memory_map(void) | |
119 | { | |
120 | int i; | |
121 | const int field = 2 * sizeof(unsigned long); | |
122 | ||
123 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
124 | printk(" memory: %0*Lx @ %0*Lx ", | |
125 | field, (unsigned long long) boot_mem_map.map[i].size, | |
126 | field, (unsigned long long) boot_mem_map.map[i].addr); | |
127 | ||
128 | switch (boot_mem_map.map[i].type) { | |
129 | case BOOT_MEM_RAM: | |
130 | printk("(usable)\n"); | |
131 | break; | |
132 | case BOOT_MEM_ROM_DATA: | |
133 | printk("(ROM data)\n"); | |
134 | break; | |
135 | case BOOT_MEM_RESERVED: | |
136 | printk("(reserved)\n"); | |
137 | break; | |
138 | default: | |
139 | printk("type %lu\n", boot_mem_map.map[i].type); | |
140 | break; | |
141 | } | |
142 | } | |
143 | } | |
144 | ||
145 | static inline void parse_cmdline_early(void) | |
146 | { | |
147 | char c = ' ', *to = command_line, *from = saved_command_line; | |
148 | unsigned long start_at, mem_size; | |
149 | int len = 0; | |
150 | int usermem = 0; | |
151 | ||
152 | printk("Determined physical RAM map:\n"); | |
153 | print_memory_map(); | |
154 | ||
155 | for (;;) { | |
156 | /* | |
157 | * "mem=XXX[kKmM]" defines a memory region from | |
158 | * 0 to <XXX>, overriding the determined size. | |
159 | * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from | |
160 | * <YYY> to <YYY>+<XXX>, overriding the determined size. | |
161 | */ | |
162 | if (c == ' ' && !memcmp(from, "mem=", 4)) { | |
163 | if (to != command_line) | |
164 | to--; | |
165 | /* | |
166 | * If a user specifies memory size, we | |
167 | * blow away any automatically generated | |
168 | * size. | |
169 | */ | |
170 | if (usermem == 0) { | |
171 | boot_mem_map.nr_map = 0; | |
172 | usermem = 1; | |
173 | } | |
174 | mem_size = memparse(from + 4, &from); | |
175 | if (*from == '@') | |
176 | start_at = memparse(from + 1, &from); | |
177 | else | |
178 | start_at = 0; | |
179 | add_memory_region(start_at, mem_size, BOOT_MEM_RAM); | |
180 | } | |
181 | c = *(from++); | |
182 | if (!c) | |
183 | break; | |
184 | if (CL_SIZE <= ++len) | |
185 | break; | |
186 | *(to++) = c; | |
187 | } | |
188 | *to = '\0'; | |
189 | ||
190 | if (usermem) { | |
191 | printk("User-defined physical RAM map:\n"); | |
192 | print_memory_map(); | |
193 | } | |
194 | } | |
195 | ||
196 | static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) | |
197 | { | |
198 | /* | |
199 | * "rd_start=0xNNNNNNNN" defines the memory address of an initrd | |
200 | * "rd_size=0xNN" it's size | |
201 | */ | |
202 | unsigned long start = 0; | |
203 | unsigned long size = 0; | |
204 | unsigned long end; | |
205 | char cmd_line[CL_SIZE]; | |
206 | char *start_str; | |
207 | char *size_str; | |
208 | char *tmp; | |
209 | ||
210 | strcpy(cmd_line, command_line); | |
211 | *command_line = 0; | |
212 | tmp = cmd_line; | |
213 | /* Ignore "rd_start=" strings in other parameters. */ | |
214 | start_str = strstr(cmd_line, "rd_start="); | |
215 | if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') | |
216 | start_str = strstr(start_str, " rd_start="); | |
217 | while (start_str) { | |
218 | if (start_str != cmd_line) | |
219 | strncat(command_line, tmp, start_str - tmp); | |
220 | start = memparse(start_str + 9, &start_str); | |
221 | tmp = start_str + 1; | |
222 | start_str = strstr(start_str, " rd_start="); | |
223 | } | |
224 | if (*tmp) | |
225 | strcat(command_line, tmp); | |
226 | ||
227 | strcpy(cmd_line, command_line); | |
228 | *command_line = 0; | |
229 | tmp = cmd_line; | |
230 | /* Ignore "rd_size" strings in other parameters. */ | |
231 | size_str = strstr(cmd_line, "rd_size="); | |
232 | if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') | |
233 | size_str = strstr(size_str, " rd_size="); | |
234 | while (size_str) { | |
235 | if (size_str != cmd_line) | |
236 | strncat(command_line, tmp, size_str - tmp); | |
237 | size = memparse(size_str + 8, &size_str); | |
238 | tmp = size_str + 1; | |
239 | size_str = strstr(size_str, " rd_size="); | |
240 | } | |
241 | if (*tmp) | |
242 | strcat(command_line, tmp); | |
243 | ||
875d43e7 | 244 | #ifdef CONFIG_64BIT |
1da177e4 LT |
245 | /* HACK: Guess if the sign extension was forgotten */ |
246 | if (start > 0x0000000080000000 && start < 0x00000000ffffffff) | |
247 | start |= 0xffffffff00000000; | |
248 | #endif | |
249 | ||
250 | end = start + size; | |
251 | if (start && end) { | |
252 | *rd_start = start; | |
253 | *rd_end = end; | |
254 | return 1; | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | #define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT) | |
260 | #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) | |
261 | #define PFN_PHYS(x) ((x) << PAGE_SHIFT) | |
262 | ||
263 | #define MAXMEM HIGHMEM_START | |
264 | #define MAXMEM_PFN PFN_DOWN(MAXMEM) | |
265 | ||
266 | static inline void bootmem_init(void) | |
267 | { | |
268 | unsigned long start_pfn; | |
269 | unsigned long reserved_end = (unsigned long)&_end; | |
270 | #ifndef CONFIG_SGI_IP27 | |
271 | unsigned long first_usable_pfn; | |
272 | unsigned long bootmap_size; | |
273 | int i; | |
274 | #endif | |
275 | #ifdef CONFIG_BLK_DEV_INITRD | |
276 | int initrd_reserve_bootmem = 0; | |
277 | ||
278 | /* Board specific code should have set up initrd_start and initrd_end */ | |
279 | ROOT_DEV = Root_RAM0; | |
280 | if (parse_rd_cmdline(&initrd_start, &initrd_end)) { | |
281 | reserved_end = max(reserved_end, initrd_end); | |
282 | initrd_reserve_bootmem = 1; | |
283 | } else { | |
284 | unsigned long tmp; | |
285 | u32 *initrd_header; | |
286 | ||
287 | tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; | |
288 | if (tmp < reserved_end) | |
289 | tmp += PAGE_SIZE; | |
290 | initrd_header = (u32 *)tmp; | |
291 | if (initrd_header[0] == 0x494E5244) { | |
292 | initrd_start = (unsigned long)&initrd_header[2]; | |
293 | initrd_end = initrd_start + initrd_header[1]; | |
294 | reserved_end = max(reserved_end, initrd_end); | |
295 | initrd_reserve_bootmem = 1; | |
296 | } | |
297 | } | |
298 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
299 | ||
300 | /* | |
301 | * Partially used pages are not usable - thus | |
302 | * we are rounding upwards. | |
303 | */ | |
304 | start_pfn = PFN_UP(CPHYSADDR(reserved_end)); | |
305 | ||
306 | #ifndef CONFIG_SGI_IP27 | |
307 | /* Find the highest page frame number we have available. */ | |
308 | max_pfn = 0; | |
309 | first_usable_pfn = -1UL; | |
310 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
311 | unsigned long start, end; | |
312 | ||
313 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
314 | continue; | |
315 | ||
316 | start = PFN_UP(boot_mem_map.map[i].addr); | |
317 | end = PFN_DOWN(boot_mem_map.map[i].addr | |
318 | + boot_mem_map.map[i].size); | |
319 | ||
320 | if (start >= end) | |
321 | continue; | |
322 | if (end > max_pfn) | |
323 | max_pfn = end; | |
324 | if (start < first_usable_pfn) { | |
325 | if (start > start_pfn) { | |
326 | first_usable_pfn = start; | |
327 | } else if (end > start_pfn) { | |
328 | first_usable_pfn = start_pfn; | |
329 | } | |
330 | } | |
331 | } | |
332 | ||
333 | /* | |
334 | * Determine low and high memory ranges | |
335 | */ | |
336 | max_low_pfn = max_pfn; | |
337 | if (max_low_pfn > MAXMEM_PFN) { | |
338 | max_low_pfn = MAXMEM_PFN; | |
339 | #ifndef CONFIG_HIGHMEM | |
340 | /* Maximum memory usable is what is directly addressable */ | |
341 | printk(KERN_WARNING "Warning only %ldMB will be used.\n", | |
342 | MAXMEM >> 20); | |
343 | printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); | |
344 | #endif | |
345 | } | |
346 | ||
347 | #ifdef CONFIG_HIGHMEM | |
348 | /* | |
349 | * Crude, we really should make a better attempt at detecting | |
350 | * highstart_pfn | |
351 | */ | |
352 | highstart_pfn = highend_pfn = max_pfn; | |
353 | if (max_pfn > MAXMEM_PFN) { | |
354 | highstart_pfn = MAXMEM_PFN; | |
355 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", | |
356 | (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); | |
357 | } | |
358 | #endif | |
359 | ||
b4819b59 YY |
360 | memory_present(0, first_usable_pfn, max_low_pfn); |
361 | ||
1da177e4 LT |
362 | /* Initialize the boot-time allocator with low memory only. */ |
363 | bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); | |
364 | ||
365 | /* | |
366 | * Register fully available low RAM pages with the bootmem allocator. | |
367 | */ | |
368 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
369 | unsigned long curr_pfn, last_pfn, size; | |
370 | ||
371 | /* | |
372 | * Reserve usable memory. | |
373 | */ | |
374 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
375 | continue; | |
376 | ||
377 | /* | |
378 | * We are rounding up the start address of usable memory: | |
379 | */ | |
380 | curr_pfn = PFN_UP(boot_mem_map.map[i].addr); | |
381 | if (curr_pfn >= max_low_pfn) | |
382 | continue; | |
383 | if (curr_pfn < start_pfn) | |
384 | curr_pfn = start_pfn; | |
385 | ||
386 | /* | |
387 | * ... and at the end of the usable range downwards: | |
388 | */ | |
389 | last_pfn = PFN_DOWN(boot_mem_map.map[i].addr | |
390 | + boot_mem_map.map[i].size); | |
391 | ||
392 | if (last_pfn > max_low_pfn) | |
393 | last_pfn = max_low_pfn; | |
394 | ||
395 | /* | |
396 | * Only register lowmem part of lowmem segment with bootmem. | |
397 | */ | |
398 | size = last_pfn - curr_pfn; | |
399 | if (curr_pfn > PFN_DOWN(HIGHMEM_START)) | |
400 | continue; | |
401 | if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) | |
402 | size = PFN_DOWN(HIGHMEM_START) - curr_pfn; | |
403 | if (!size) | |
404 | continue; | |
405 | ||
406 | /* | |
407 | * ... finally, did all the rounding and playing | |
408 | * around just make the area go away? | |
409 | */ | |
410 | if (last_pfn <= curr_pfn) | |
411 | continue; | |
412 | ||
413 | /* Register lowmem ranges */ | |
414 | free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); | |
415 | } | |
416 | ||
417 | /* Reserve the bootmap memory. */ | |
418 | reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); | |
419 | #endif /* CONFIG_SGI_IP27 */ | |
420 | ||
421 | #ifdef CONFIG_BLK_DEV_INITRD | |
422 | initrd_below_start_ok = 1; | |
423 | if (initrd_start) { | |
424 | unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); | |
425 | printk("Initial ramdisk at: 0x%p (%lu bytes)\n", | |
426 | (void *)initrd_start, initrd_size); | |
427 | ||
428 | if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { | |
429 | printk("initrd extends beyond end of memory " | |
430 | "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", | |
431 | sizeof(long) * 2, | |
432 | (unsigned long long)CPHYSADDR(initrd_end), | |
433 | sizeof(long) * 2, | |
434 | (unsigned long long)PFN_PHYS(max_low_pfn)); | |
435 | initrd_start = initrd_end = 0; | |
436 | initrd_reserve_bootmem = 0; | |
437 | } | |
438 | ||
439 | if (initrd_reserve_bootmem) | |
440 | reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); | |
441 | } | |
442 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
443 | } | |
444 | ||
445 | static inline void resource_init(void) | |
446 | { | |
447 | int i; | |
448 | ||
875d43e7 | 449 | #if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64) |
1da177e4 LT |
450 | /* |
451 | * The 64bit code in 32bit object format trick can't represent | |
452 | * 64bit wide relocations for linker script symbols. | |
453 | */ | |
454 | code_resource.start = CPHYSADDR(&_text); | |
455 | code_resource.end = CPHYSADDR(&_etext) - 1; | |
456 | data_resource.start = CPHYSADDR(&_etext); | |
457 | data_resource.end = CPHYSADDR(&_edata) - 1; | |
458 | #else | |
459 | code_resource.start = virt_to_phys(&_text); | |
460 | code_resource.end = virt_to_phys(&_etext) - 1; | |
461 | data_resource.start = virt_to_phys(&_etext); | |
462 | data_resource.end = virt_to_phys(&_edata) - 1; | |
463 | #endif | |
464 | ||
465 | /* | |
466 | * Request address space for all standard RAM. | |
467 | */ | |
468 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
469 | struct resource *res; | |
470 | unsigned long start, end; | |
471 | ||
472 | start = boot_mem_map.map[i].addr; | |
473 | end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; | |
474 | if (start >= MAXMEM) | |
475 | continue; | |
476 | if (end >= MAXMEM) | |
477 | end = MAXMEM - 1; | |
478 | ||
479 | res = alloc_bootmem(sizeof(struct resource)); | |
480 | switch (boot_mem_map.map[i].type) { | |
481 | case BOOT_MEM_RAM: | |
482 | case BOOT_MEM_ROM_DATA: | |
483 | res->name = "System RAM"; | |
484 | break; | |
485 | case BOOT_MEM_RESERVED: | |
486 | default: | |
487 | res->name = "reserved"; | |
488 | } | |
489 | ||
490 | res->start = start; | |
491 | res->end = end; | |
492 | ||
493 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
494 | request_resource(&iomem_resource, res); | |
495 | ||
496 | /* | |
497 | * We don't know which RAM region contains kernel data, | |
498 | * so we try it repeatedly and let the resource manager | |
499 | * test it. | |
500 | */ | |
501 | request_resource(res, &code_resource); | |
502 | request_resource(res, &data_resource); | |
503 | } | |
504 | } | |
505 | ||
506 | #undef PFN_UP | |
507 | #undef PFN_DOWN | |
508 | #undef PFN_PHYS | |
509 | ||
510 | #undef MAXMEM | |
511 | #undef MAXMEM_PFN | |
512 | ||
513 | static int __initdata earlyinit_debug; | |
514 | ||
515 | static int __init earlyinit_debug_setup(char *str) | |
516 | { | |
517 | earlyinit_debug = 1; | |
518 | return 1; | |
519 | } | |
520 | __setup("earlyinit_debug", earlyinit_debug_setup); | |
521 | ||
522 | extern initcall_t __earlyinitcall_start, __earlyinitcall_end; | |
523 | ||
524 | static void __init do_earlyinitcalls(void) | |
525 | { | |
526 | initcall_t *call, *start, *end; | |
527 | ||
528 | start = &__earlyinitcall_start; | |
529 | end = &__earlyinitcall_end; | |
530 | ||
531 | for (call = start; call < end; call++) { | |
532 | if (earlyinit_debug) | |
533 | printk("calling earlyinitcall 0x%p\n", *call); | |
534 | ||
535 | (*call)(); | |
536 | } | |
537 | } | |
538 | ||
539 | void __init setup_arch(char **cmdline_p) | |
540 | { | |
541 | cpu_probe(); | |
542 | prom_init(); | |
543 | cpu_report(); | |
544 | ||
545 | #if defined(CONFIG_VT) | |
546 | #if defined(CONFIG_VGA_CONSOLE) | |
547 | conswitchp = &vga_con; | |
548 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
549 | conswitchp = &dummy_con; | |
550 | #endif | |
551 | #endif | |
552 | ||
553 | /* call board setup routine */ | |
554 | do_earlyinitcalls(); | |
555 | ||
556 | strlcpy(command_line, arcs_cmdline, sizeof(command_line)); | |
557 | strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); | |
558 | ||
559 | *cmdline_p = command_line; | |
560 | ||
561 | parse_cmdline_early(); | |
562 | bootmem_init(); | |
b4819b59 | 563 | sparse_init(); |
1da177e4 LT |
564 | paging_init(); |
565 | resource_init(); | |
566 | } | |
567 | ||
568 | int __init fpu_disable(char *s) | |
569 | { | |
570 | cpu_data[0].options &= ~MIPS_CPU_FPU; | |
571 | ||
572 | return 1; | |
573 | } | |
574 | ||
575 | __setup("nofpu", fpu_disable); |