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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 | */ | |
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/ioport.h> | |
1da177e4 | 15 | #include <linux/module.h> |
894673ee | 16 | #include <linux/screen_info.h> |
1da177e4 LT |
17 | #include <linux/bootmem.h> |
18 | #include <linux/initrd.h> | |
1da177e4 LT |
19 | #include <linux/root_dev.h> |
20 | #include <linux/highmem.h> | |
21 | #include <linux/console.h> | |
22a9835c | 22 | #include <linux/pfn.h> |
1da177e4 LT |
23 | |
24 | #include <asm/addrspace.h> | |
25 | #include <asm/bootinfo.h> | |
ec74e361 | 26 | #include <asm/cache.h> |
1da177e4 LT |
27 | #include <asm/cpu.h> |
28 | #include <asm/sections.h> | |
29 | #include <asm/setup.h> | |
30 | #include <asm/system.h> | |
31 | ||
ec74e361 | 32 | struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; |
1da177e4 LT |
33 | |
34 | EXPORT_SYMBOL(cpu_data); | |
35 | ||
36 | #ifdef CONFIG_VT | |
37 | struct screen_info screen_info; | |
38 | #endif | |
39 | ||
40 | /* | |
41 | * Despite it's name this variable is even if we don't have PCI | |
42 | */ | |
43 | unsigned int PCI_DMA_BUS_IS_PHYS; | |
44 | ||
45 | EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); | |
46 | ||
47 | /* | |
48 | * Setup information | |
49 | * | |
50 | * These are initialized so they are in the .data section | |
51 | */ | |
ec74e361 RB |
52 | unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; |
53 | unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; | |
1da177e4 LT |
54 | |
55 | EXPORT_SYMBOL(mips_machtype); | |
56 | EXPORT_SYMBOL(mips_machgroup); | |
57 | ||
58 | struct boot_mem_map boot_mem_map; | |
59 | ||
60 | static char command_line[CL_SIZE]; | |
61 | char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; | |
62 | ||
63 | /* | |
64 | * mips_io_port_base is the begin of the address space to which x86 style | |
65 | * I/O ports are mapped. | |
66 | */ | |
ec74e361 | 67 | const unsigned long mips_io_port_base __read_mostly = -1; |
1da177e4 LT |
68 | EXPORT_SYMBOL(mips_io_port_base); |
69 | ||
70 | /* | |
71 | * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped | |
72 | * for the processor. | |
73 | */ | |
74 | unsigned long isa_slot_offset; | |
75 | EXPORT_SYMBOL(isa_slot_offset); | |
76 | ||
77 | static struct resource code_resource = { .name = "Kernel code", }; | |
78 | static struct resource data_resource = { .name = "Kernel data", }; | |
79 | ||
80 | void __init add_memory_region(phys_t start, phys_t size, long type) | |
81 | { | |
82 | int x = boot_mem_map.nr_map; | |
83 | struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; | |
84 | ||
b6f1f0de FBH |
85 | /* Sanity check */ |
86 | if (start + size < start) { | |
87 | printk("Trying to add an invalid memory region, skipped\n"); | |
88 | return; | |
89 | } | |
90 | ||
1da177e4 LT |
91 | /* |
92 | * Try to merge with previous entry if any. This is far less than | |
93 | * perfect but is sufficient for most real world cases. | |
94 | */ | |
95 | if (x && prev->addr + prev->size == start && prev->type == type) { | |
96 | prev->size += size; | |
97 | return; | |
98 | } | |
99 | ||
100 | if (x == BOOT_MEM_MAP_MAX) { | |
101 | printk("Ooops! Too many entries in the memory map!\n"); | |
102 | return; | |
103 | } | |
104 | ||
105 | boot_mem_map.map[x].addr = start; | |
106 | boot_mem_map.map[x].size = size; | |
107 | boot_mem_map.map[x].type = type; | |
108 | boot_mem_map.nr_map++; | |
109 | } | |
110 | ||
111 | static void __init print_memory_map(void) | |
112 | { | |
113 | int i; | |
114 | const int field = 2 * sizeof(unsigned long); | |
115 | ||
116 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
117 | printk(" memory: %0*Lx @ %0*Lx ", | |
118 | field, (unsigned long long) boot_mem_map.map[i].size, | |
119 | field, (unsigned long long) boot_mem_map.map[i].addr); | |
120 | ||
121 | switch (boot_mem_map.map[i].type) { | |
122 | case BOOT_MEM_RAM: | |
123 | printk("(usable)\n"); | |
124 | break; | |
125 | case BOOT_MEM_ROM_DATA: | |
126 | printk("(ROM data)\n"); | |
127 | break; | |
128 | case BOOT_MEM_RESERVED: | |
129 | printk("(reserved)\n"); | |
130 | break; | |
131 | default: | |
132 | printk("type %lu\n", boot_mem_map.map[i].type); | |
133 | break; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
d2043ca8 FBH |
138 | /* |
139 | * Manage initrd | |
140 | */ | |
141 | #ifdef CONFIG_BLK_DEV_INITRD | |
142 | ||
a09fc446 | 143 | static int __init rd_start_early(char *p) |
1da177e4 | 144 | { |
a09fc446 | 145 | unsigned long start = memparse(p, &p); |
1da177e4 | 146 | |
875d43e7 | 147 | #ifdef CONFIG_64BIT |
a7837b76 FBH |
148 | /* Guess if the sign extension was forgotten by bootloader */ |
149 | if (start < XKPHYS) | |
150 | start = (int)start; | |
1da177e4 | 151 | #endif |
a09fc446 FBH |
152 | initrd_start = start; |
153 | initrd_end += start; | |
a09fc446 FBH |
154 | return 0; |
155 | } | |
156 | early_param("rd_start", rd_start_early); | |
157 | ||
158 | static int __init rd_size_early(char *p) | |
159 | { | |
160 | initrd_end += memparse(p, &p); | |
1da177e4 LT |
161 | return 0; |
162 | } | |
a09fc446 | 163 | early_param("rd_size", rd_size_early); |
1da177e4 | 164 | |
a7837b76 | 165 | /* it returns the next free pfn after initrd */ |
d2043ca8 FBH |
166 | static unsigned long __init init_initrd(void) |
167 | { | |
a7837b76 | 168 | unsigned long end; |
d2043ca8 FBH |
169 | u32 *initrd_header; |
170 | ||
d2043ca8 | 171 | /* |
a09fc446 FBH |
172 | * Board specific code or command line parser should have |
173 | * already set up initrd_start and initrd_end. In these cases | |
174 | * perfom sanity checks and use them if all looks good. | |
d2043ca8 | 175 | */ |
a7837b76 FBH |
176 | if (initrd_start && initrd_end > initrd_start) |
177 | goto sanitize; | |
178 | ||
179 | /* | |
180 | * See if initrd has been added to the kernel image by | |
181 | * arch/mips/boot/addinitrd.c. In that case a header is | |
182 | * prepended to initrd and is made up by 8 bytes. The fisrt | |
183 | * word is a magic number and the second one is the size of | |
184 | * initrd. Initrd start must be page aligned in any cases. | |
185 | */ | |
186 | initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8; | |
187 | if (initrd_header[0] != 0x494E5244) | |
188 | goto disable; | |
189 | initrd_start = (unsigned long)(initrd_header + 2); | |
190 | initrd_end = initrd_start + initrd_header[1]; | |
191 | ||
192 | sanitize: | |
193 | if (initrd_start & ~PAGE_MASK) { | |
194 | printk(KERN_ERR "initrd start must be page aligned\n"); | |
195 | goto disable; | |
d2043ca8 | 196 | } |
a7837b76 FBH |
197 | if (initrd_start < PAGE_OFFSET) { |
198 | printk(KERN_ERR "initrd start < PAGE_OFFSET\n"); | |
199 | goto disable; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Sanitize initrd addresses. For example firmware | |
204 | * can't guess if they need to pass them through | |
205 | * 64-bits values if the kernel has been built in pure | |
206 | * 32-bit. We need also to switch from KSEG0 to XKPHYS | |
207 | * addresses now, so the code can now safely use __pa(). | |
208 | */ | |
209 | end = __pa(initrd_end); | |
210 | initrd_end = (unsigned long)__va(end); | |
211 | initrd_start = (unsigned long)__va(__pa(initrd_start)); | |
212 | ||
213 | ROOT_DEV = Root_RAM0; | |
214 | return PFN_UP(end); | |
215 | disable: | |
216 | initrd_start = 0; | |
217 | initrd_end = 0; | |
218 | return 0; | |
d2043ca8 FBH |
219 | } |
220 | ||
221 | static void __init finalize_initrd(void) | |
222 | { | |
223 | unsigned long size = initrd_end - initrd_start; | |
224 | ||
225 | if (size == 0) { | |
226 | printk(KERN_INFO "Initrd not found or empty"); | |
227 | goto disable; | |
228 | } | |
d4df6d4e | 229 | if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { |
d2043ca8 FBH |
230 | printk("Initrd extends beyond end of memory"); |
231 | goto disable; | |
232 | } | |
233 | ||
d4df6d4e | 234 | reserve_bootmem(__pa(initrd_start), size); |
d2043ca8 FBH |
235 | initrd_below_start_ok = 1; |
236 | ||
237 | printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n", | |
238 | initrd_start, size); | |
239 | return; | |
240 | disable: | |
241 | printk(" - disabling initrd\n"); | |
242 | initrd_start = 0; | |
243 | initrd_end = 0; | |
244 | } | |
245 | ||
246 | #else /* !CONFIG_BLK_DEV_INITRD */ | |
247 | ||
9ba126cf RB |
248 | static unsigned long __init init_initrd(void) |
249 | { | |
250 | return 0; | |
251 | } | |
252 | ||
d2043ca8 FBH |
253 | #define finalize_initrd() do {} while (0) |
254 | ||
255 | #endif | |
256 | ||
b6f1f0de FBH |
257 | /* |
258 | * Initialize the bootmem allocator. It also setup initrd related data | |
259 | * if needed. | |
260 | */ | |
d2043ca8 FBH |
261 | #ifdef CONFIG_SGI_IP27 |
262 | ||
b6f1f0de | 263 | static void __init bootmem_init(void) |
1da177e4 | 264 | { |
d2043ca8 FBH |
265 | init_initrd(); |
266 | finalize_initrd(); | |
267 | } | |
268 | ||
269 | #else /* !CONFIG_SGI_IP27 */ | |
270 | ||
271 | static void __init bootmem_init(void) | |
272 | { | |
273 | unsigned long reserved_end; | |
b6f1f0de FBH |
274 | unsigned long highest = 0; |
275 | unsigned long mapstart = -1UL; | |
1da177e4 LT |
276 | unsigned long bootmap_size; |
277 | int i; | |
1da177e4 LT |
278 | |
279 | /* | |
d2043ca8 FBH |
280 | * Init any data related to initrd. It's a nop if INITRD is |
281 | * not selected. Once that done we can determine the low bound | |
282 | * of usable memory. | |
1da177e4 | 283 | */ |
a7837b76 | 284 | reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end))); |
1da177e4 | 285 | |
b6f1f0de FBH |
286 | /* |
287 | * Find the highest page frame number we have available. | |
288 | */ | |
1da177e4 LT |
289 | for (i = 0; i < boot_mem_map.nr_map; i++) { |
290 | unsigned long start, end; | |
291 | ||
292 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
293 | continue; | |
294 | ||
295 | start = PFN_UP(boot_mem_map.map[i].addr); | |
296 | end = PFN_DOWN(boot_mem_map.map[i].addr | |
b6f1f0de | 297 | + boot_mem_map.map[i].size); |
1da177e4 | 298 | |
b6f1f0de FBH |
299 | if (end > highest) |
300 | highest = end; | |
301 | if (end <= reserved_end) | |
1da177e4 | 302 | continue; |
b6f1f0de FBH |
303 | if (start >= mapstart) |
304 | continue; | |
305 | mapstart = max(reserved_end, start); | |
1da177e4 LT |
306 | } |
307 | ||
308 | /* | |
309 | * Determine low and high memory ranges | |
310 | */ | |
b6f1f0de FBH |
311 | if (highest > PFN_DOWN(HIGHMEM_START)) { |
312 | #ifdef CONFIG_HIGHMEM | |
313 | highstart_pfn = PFN_DOWN(HIGHMEM_START); | |
314 | highend_pfn = highest; | |
1da177e4 | 315 | #endif |
b6f1f0de | 316 | highest = PFN_DOWN(HIGHMEM_START); |
1da177e4 LT |
317 | } |
318 | ||
1da177e4 | 319 | /* |
b6f1f0de | 320 | * Initialize the boot-time allocator with low memory only. |
1da177e4 | 321 | */ |
b6f1f0de | 322 | bootmap_size = init_bootmem(mapstart, highest); |
1da177e4 LT |
323 | |
324 | /* | |
325 | * Register fully available low RAM pages with the bootmem allocator. | |
326 | */ | |
327 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
b6f1f0de | 328 | unsigned long start, end, size; |
1da177e4 LT |
329 | |
330 | /* | |
331 | * Reserve usable memory. | |
332 | */ | |
333 | if (boot_mem_map.map[i].type != BOOT_MEM_RAM) | |
334 | continue; | |
335 | ||
b6f1f0de FBH |
336 | start = PFN_UP(boot_mem_map.map[i].addr); |
337 | end = PFN_DOWN(boot_mem_map.map[i].addr | |
1da177e4 | 338 | + boot_mem_map.map[i].size); |
1da177e4 | 339 | /* |
b6f1f0de FBH |
340 | * We are rounding up the start address of usable memory |
341 | * and at the end of the usable range downwards. | |
1da177e4 | 342 | */ |
b6f1f0de | 343 | if (start >= max_low_pfn) |
1da177e4 | 344 | continue; |
b6f1f0de FBH |
345 | if (start < reserved_end) |
346 | start = reserved_end; | |
347 | if (end > max_low_pfn) | |
348 | end = max_low_pfn; | |
1da177e4 LT |
349 | |
350 | /* | |
b6f1f0de | 351 | * ... finally, is the area going away? |
1da177e4 | 352 | */ |
b6f1f0de | 353 | if (end <= start) |
1da177e4 | 354 | continue; |
b6f1f0de | 355 | size = end - start; |
1da177e4 LT |
356 | |
357 | /* Register lowmem ranges */ | |
b6f1f0de FBH |
358 | free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT); |
359 | memory_present(0, start, end); | |
1da177e4 LT |
360 | } |
361 | ||
b6f1f0de FBH |
362 | /* |
363 | * Reserve the bootmap memory. | |
364 | */ | |
365 | reserve_bootmem(PFN_PHYS(mapstart), bootmap_size); | |
366 | ||
d2043ca8 FBH |
367 | /* |
368 | * Reserve initrd memory if needed. | |
369 | */ | |
370 | finalize_initrd(); | |
1da177e4 LT |
371 | } |
372 | ||
d2043ca8 FBH |
373 | #endif /* CONFIG_SGI_IP27 */ |
374 | ||
2925aba4 RB |
375 | /* |
376 | * arch_mem_init - initialize memory managment subsystem | |
377 | * | |
378 | * o plat_mem_setup() detects the memory configuration and will record detected | |
379 | * memory areas using add_memory_region. | |
2925aba4 RB |
380 | * |
381 | * At this stage the memory configuration of the system is known to the | |
382 | * kernel but generic memory managment system is still entirely uninitialized. | |
383 | * | |
384 | * o bootmem_init() | |
385 | * o sparse_init() | |
386 | * o paging_init() | |
387 | * | |
388 | * At this stage the bootmem allocator is ready to use. | |
389 | * | |
390 | * NOTE: historically plat_mem_setup did the entire platform initialization. | |
391 | * This was rather impractical because it meant plat_mem_setup had to | |
392 | * get away without any kind of memory allocator. To keep old code from | |
393 | * breaking plat_setup was just renamed to plat_setup and a second platform | |
394 | * initialization hook for anything else was introduced. | |
395 | */ | |
396 | ||
a09fc446 FBH |
397 | static int usermem __initdata = 0; |
398 | ||
399 | static int __init early_parse_mem(char *p) | |
400 | { | |
401 | unsigned long start, size; | |
402 | ||
403 | /* | |
404 | * If a user specifies memory size, we | |
405 | * blow away any automatically generated | |
406 | * size. | |
407 | */ | |
408 | if (usermem == 0) { | |
409 | boot_mem_map.nr_map = 0; | |
410 | usermem = 1; | |
411 | } | |
412 | start = 0; | |
413 | size = memparse(p, &p); | |
414 | if (*p == '@') | |
415 | start = memparse(p + 1, &p); | |
416 | ||
417 | add_memory_region(start, size, BOOT_MEM_RAM); | |
418 | return 0; | |
419 | } | |
420 | early_param("mem", early_parse_mem); | |
2925aba4 RB |
421 | |
422 | static void __init arch_mem_init(char **cmdline_p) | |
423 | { | |
a09fc446 FBH |
424 | extern void plat_mem_setup(void); |
425 | ||
2925aba4 RB |
426 | /* call board setup routine */ |
427 | plat_mem_setup(); | |
428 | ||
a09fc446 FBH |
429 | printk("Determined physical RAM map:\n"); |
430 | print_memory_map(); | |
431 | ||
2925aba4 RB |
432 | strlcpy(command_line, arcs_cmdline, sizeof(command_line)); |
433 | strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); | |
434 | ||
435 | *cmdline_p = command_line; | |
436 | ||
a09fc446 FBH |
437 | parse_early_param(); |
438 | ||
439 | if (usermem) { | |
440 | printk("User-defined physical RAM map:\n"); | |
441 | print_memory_map(); | |
442 | } | |
443 | ||
2925aba4 RB |
444 | bootmem_init(); |
445 | sparse_init(); | |
446 | paging_init(); | |
447 | } | |
448 | ||
8df32c63 | 449 | static void __init resource_init(void) |
1da177e4 LT |
450 | { |
451 | int i; | |
452 | ||
6adb5fe7 RB |
453 | if (UNCAC_BASE != IO_BASE) |
454 | return; | |
455 | ||
f5bffe3a FBH |
456 | code_resource.start = __pa_symbol(&_text); |
457 | code_resource.end = __pa_symbol(&_etext) - 1; | |
458 | data_resource.start = __pa_symbol(&_etext); | |
459 | data_resource.end = __pa_symbol(&_edata) - 1; | |
1da177e4 LT |
460 | |
461 | /* | |
462 | * Request address space for all standard RAM. | |
463 | */ | |
464 | for (i = 0; i < boot_mem_map.nr_map; i++) { | |
465 | struct resource *res; | |
466 | unsigned long start, end; | |
467 | ||
468 | start = boot_mem_map.map[i].addr; | |
469 | end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; | |
1c6fd44d | 470 | if (start >= HIGHMEM_START) |
1da177e4 | 471 | continue; |
1c6fd44d FBH |
472 | if (end >= HIGHMEM_START) |
473 | end = HIGHMEM_START - 1; | |
1da177e4 LT |
474 | |
475 | res = alloc_bootmem(sizeof(struct resource)); | |
476 | switch (boot_mem_map.map[i].type) { | |
477 | case BOOT_MEM_RAM: | |
478 | case BOOT_MEM_ROM_DATA: | |
479 | res->name = "System RAM"; | |
480 | break; | |
481 | case BOOT_MEM_RESERVED: | |
482 | default: | |
483 | res->name = "reserved"; | |
484 | } | |
485 | ||
486 | res->start = start; | |
487 | res->end = end; | |
488 | ||
489 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; | |
490 | request_resource(&iomem_resource, res); | |
491 | ||
492 | /* | |
493 | * We don't know which RAM region contains kernel data, | |
494 | * so we try it repeatedly and let the resource manager | |
495 | * test it. | |
496 | */ | |
497 | request_resource(res, &code_resource); | |
498 | request_resource(res, &data_resource); | |
499 | } | |
500 | } | |
501 | ||
1da177e4 LT |
502 | void __init setup_arch(char **cmdline_p) |
503 | { | |
504 | cpu_probe(); | |
505 | prom_init(); | |
506 | cpu_report(); | |
507 | ||
508 | #if defined(CONFIG_VT) | |
509 | #if defined(CONFIG_VGA_CONSOLE) | |
510 | conswitchp = &vga_con; | |
511 | #elif defined(CONFIG_DUMMY_CONSOLE) | |
512 | conswitchp = &dummy_con; | |
513 | #endif | |
514 | #endif | |
515 | ||
2925aba4 | 516 | arch_mem_init(cmdline_p); |
1da177e4 | 517 | |
1da177e4 | 518 | resource_init(); |
9b6695a8 RB |
519 | #ifdef CONFIG_SMP |
520 | plat_smp_setup(); | |
521 | #endif | |
1da177e4 LT |
522 | } |
523 | ||
524 | int __init fpu_disable(char *s) | |
525 | { | |
f088fc84 RB |
526 | int i; |
527 | ||
528 | for (i = 0; i < NR_CPUS; i++) | |
529 | cpu_data[i].options &= ~MIPS_CPU_FPU; | |
1da177e4 LT |
530 | |
531 | return 1; | |
532 | } | |
533 | ||
534 | __setup("nofpu", fpu_disable); | |
e50c0a8f RB |
535 | |
536 | int __init dsp_disable(char *s) | |
537 | { | |
538 | cpu_data[0].ases &= ~MIPS_ASE_DSP; | |
539 | ||
540 | return 1; | |
541 | } | |
542 | ||
543 | __setup("nodsp", dsp_disable); |