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, 2007 Maciej W. Rozycki
12 */
13 #include <linux/init.h>
14 #include <linux/ioport.h>
15 #include <linux/module.h>
16 #include <linux/screen_info.h>
17 #include <linux/bootmem.h>
18 #include <linux/initrd.h>
19 #include <linux/root_dev.h>
20 #include <linux/highmem.h>
21 #include <linux/console.h>
22 #include <linux/pfn.h>
23 #include <linux/debugfs.h>
24
25 #include <asm/addrspace.h>
26 #include <asm/bootinfo.h>
27 #include <asm/bugs.h>
28 #include <asm/cache.h>
29 #include <asm/cpu.h>
30 #include <asm/sections.h>
31 #include <asm/setup.h>
32 #include <asm/smp-ops.h>
33 #include <asm/system.h>
34 #include <asm/prom.h>
35
36 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
37
38 EXPORT_SYMBOL(cpu_data);
39
40 #ifdef CONFIG_VT
41 struct screen_info screen_info;
42 #endif
43
44 /*
45 * Despite it's name this variable is even if we don't have PCI
46 */
47 unsigned int PCI_DMA_BUS_IS_PHYS;
48
49 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
50
51 /*
52 * Setup information
53 *
54 * These are initialized so they are in the .data section
55 */
56 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
57
58 EXPORT_SYMBOL(mips_machtype);
59
60 struct boot_mem_map boot_mem_map;
61
62 static char __initdata command_line[COMMAND_LINE_SIZE];
63 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
64
65 #ifdef CONFIG_CMDLINE_BOOL
66 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
67 #endif
68
69 /*
70 * mips_io_port_base is the begin of the address space to which x86 style
71 * I/O ports are mapped.
72 */
73 const unsigned long mips_io_port_base = -1;
74 EXPORT_SYMBOL(mips_io_port_base);
75
76 static struct resource code_resource = { .name = "Kernel code", };
77 static struct resource data_resource = { .name = "Kernel data", };
78
add_memory_region(phys_t start,phys_t size,long type)79 void __init add_memory_region(phys_t start, phys_t size, long type)
80 {
81 int x = boot_mem_map.nr_map;
82 struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
83
84 /* Sanity check */
85 if (start + size < start) {
86 pr_warning("Trying to add an invalid memory region, skipped\n");
87 return;
88 }
89
90 /*
91 * Try to merge with previous entry if any. This is far less than
92 * perfect but is sufficient for most real world cases.
93 */
94 if (x && prev->addr + prev->size == start && prev->type == type) {
95 prev->size += size;
96 return;
97 }
98
99 if (x == BOOT_MEM_MAP_MAX) {
100 pr_err("Ooops! Too many entries in the memory map!\n");
101 return;
102 }
103
104 boot_mem_map.map[x].addr = start;
105 boot_mem_map.map[x].size = size;
106 boot_mem_map.map[x].type = type;
107 boot_mem_map.nr_map++;
108 }
109
print_memory_map(void)110 static void __init print_memory_map(void)
111 {
112 int i;
113 const int field = 2 * sizeof(unsigned long);
114
115 for (i = 0; i < boot_mem_map.nr_map; i++) {
116 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
117 field, (unsigned long long) boot_mem_map.map[i].size,
118 field, (unsigned long long) boot_mem_map.map[i].addr);
119
120 switch (boot_mem_map.map[i].type) {
121 case BOOT_MEM_RAM:
122 printk(KERN_CONT "(usable)\n");
123 break;
124 case BOOT_MEM_ROM_DATA:
125 printk(KERN_CONT "(ROM data)\n");
126 break;
127 case BOOT_MEM_RESERVED:
128 printk(KERN_CONT "(reserved)\n");
129 break;
130 default:
131 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
132 break;
133 }
134 }
135 }
136
137 /*
138 * Manage initrd
139 */
140 #ifdef CONFIG_BLK_DEV_INITRD
141
rd_start_early(char * p)142 static int __init rd_start_early(char *p)
143 {
144 unsigned long start = memparse(p, &p);
145
146 #ifdef CONFIG_64BIT
147 /* Guess if the sign extension was forgotten by bootloader */
148 if (start < XKPHYS)
149 start = (int)start;
150 #endif
151 initrd_start = start;
152 initrd_end += start;
153 return 0;
154 }
155 early_param("rd_start", rd_start_early);
156
rd_size_early(char * p)157 static int __init rd_size_early(char *p)
158 {
159 initrd_end += memparse(p, &p);
160 return 0;
161 }
162 early_param("rd_size", rd_size_early);
163
164 /* it returns the next free pfn after initrd */
init_initrd(void)165 static unsigned long __init init_initrd(void)
166 {
167 unsigned long end;
168
169 /*
170 * Board specific code or command line parser should have
171 * already set up initrd_start and initrd_end. In these cases
172 * perfom sanity checks and use them if all looks good.
173 */
174 if (!initrd_start || initrd_end <= initrd_start)
175 goto disable;
176
177 if (initrd_start & ~PAGE_MASK) {
178 pr_err("initrd start must be page aligned\n");
179 goto disable;
180 }
181 if (initrd_start < PAGE_OFFSET) {
182 pr_err("initrd start < PAGE_OFFSET\n");
183 goto disable;
184 }
185
186 /*
187 * Sanitize initrd addresses. For example firmware
188 * can't guess if they need to pass them through
189 * 64-bits values if the kernel has been built in pure
190 * 32-bit. We need also to switch from KSEG0 to XKPHYS
191 * addresses now, so the code can now safely use __pa().
192 */
193 end = __pa(initrd_end);
194 initrd_end = (unsigned long)__va(end);
195 initrd_start = (unsigned long)__va(__pa(initrd_start));
196
197 ROOT_DEV = Root_RAM0;
198 return PFN_UP(end);
199 disable:
200 initrd_start = 0;
201 initrd_end = 0;
202 return 0;
203 }
204
finalize_initrd(void)205 static void __init finalize_initrd(void)
206 {
207 unsigned long size = initrd_end - initrd_start;
208
209 if (size == 0) {
210 printk(KERN_INFO "Initrd not found or empty");
211 goto disable;
212 }
213 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
214 printk(KERN_ERR "Initrd extends beyond end of memory");
215 goto disable;
216 }
217
218 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
219 initrd_below_start_ok = 1;
220
221 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
222 initrd_start, size);
223 return;
224 disable:
225 printk(KERN_CONT " - disabling initrd\n");
226 initrd_start = 0;
227 initrd_end = 0;
228 }
229
230 #else /* !CONFIG_BLK_DEV_INITRD */
231
init_initrd(void)232 static unsigned long __init init_initrd(void)
233 {
234 return 0;
235 }
236
237 #define finalize_initrd() do {} while (0)
238
239 #endif
240
241 /*
242 * Initialize the bootmem allocator. It also setup initrd related data
243 * if needed.
244 */
245 #ifdef CONFIG_SGI_IP27
246
bootmem_init(void)247 static void __init bootmem_init(void)
248 {
249 init_initrd();
250 finalize_initrd();
251 }
252
253 #else /* !CONFIG_SGI_IP27 */
254
bootmem_init(void)255 static void __init bootmem_init(void)
256 {
257 unsigned long reserved_end;
258 unsigned long mapstart = ~0UL;
259 unsigned long bootmap_size;
260 int i;
261
262 /*
263 * Init any data related to initrd. It's a nop if INITRD is
264 * not selected. Once that done we can determine the low bound
265 * of usable memory.
266 */
267 reserved_end = max(init_initrd(),
268 (unsigned long) PFN_UP(__pa_symbol(&_end)));
269
270 /*
271 * max_low_pfn is not a number of pages. The number of pages
272 * of the system is given by 'max_low_pfn - min_low_pfn'.
273 */
274 min_low_pfn = ~0UL;
275 max_low_pfn = 0;
276
277 /*
278 * Find the highest page frame number we have available.
279 */
280 for (i = 0; i < boot_mem_map.nr_map; i++) {
281 unsigned long start, end;
282
283 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
284 continue;
285
286 start = PFN_UP(boot_mem_map.map[i].addr);
287 end = PFN_DOWN(boot_mem_map.map[i].addr
288 + boot_mem_map.map[i].size);
289
290 if (end > max_low_pfn)
291 max_low_pfn = end;
292 if (start < min_low_pfn)
293 min_low_pfn = start;
294 if (end <= reserved_end)
295 continue;
296 if (start >= mapstart)
297 continue;
298 mapstart = max(reserved_end, start);
299 }
300
301 if (min_low_pfn >= max_low_pfn)
302 panic("Incorrect memory mapping !!!");
303 if (min_low_pfn > ARCH_PFN_OFFSET) {
304 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
305 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
306 min_low_pfn - ARCH_PFN_OFFSET);
307 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
308 pr_info("%lu free pages won't be used\n",
309 ARCH_PFN_OFFSET - min_low_pfn);
310 }
311 min_low_pfn = ARCH_PFN_OFFSET;
312
313 /*
314 * Determine low and high memory ranges
315 */
316 max_pfn = max_low_pfn;
317 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
318 #ifdef CONFIG_HIGHMEM
319 highstart_pfn = PFN_DOWN(HIGHMEM_START);
320 highend_pfn = max_low_pfn;
321 #endif
322 max_low_pfn = PFN_DOWN(HIGHMEM_START);
323 }
324
325 /*
326 * Initialize the boot-time allocator with low memory only.
327 */
328 bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
329 min_low_pfn, max_low_pfn);
330
331
332 for (i = 0; i < boot_mem_map.nr_map; i++) {
333 unsigned long start, end;
334
335 start = PFN_UP(boot_mem_map.map[i].addr);
336 end = PFN_DOWN(boot_mem_map.map[i].addr
337 + boot_mem_map.map[i].size);
338
339 if (start <= min_low_pfn)
340 start = min_low_pfn;
341 if (start >= end)
342 continue;
343
344 #ifndef CONFIG_HIGHMEM
345 if (end > max_low_pfn)
346 end = max_low_pfn;
347
348 /*
349 * ... finally, is the area going away?
350 */
351 if (end <= start)
352 continue;
353 #endif
354
355 add_active_range(0, start, end);
356 }
357
358 /*
359 * Register fully available low RAM pages with the bootmem allocator.
360 */
361 for (i = 0; i < boot_mem_map.nr_map; i++) {
362 unsigned long start, end, size;
363
364 /*
365 * Reserve usable memory.
366 */
367 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
368 continue;
369
370 start = PFN_UP(boot_mem_map.map[i].addr);
371 end = PFN_DOWN(boot_mem_map.map[i].addr
372 + boot_mem_map.map[i].size);
373 /*
374 * We are rounding up the start address of usable memory
375 * and at the end of the usable range downwards.
376 */
377 if (start >= max_low_pfn)
378 continue;
379 if (start < reserved_end)
380 start = reserved_end;
381 if (end > max_low_pfn)
382 end = max_low_pfn;
383
384 /*
385 * ... finally, is the area going away?
386 */
387 if (end <= start)
388 continue;
389 size = end - start;
390
391 /* Register lowmem ranges */
392 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
393 memory_present(0, start, end);
394 }
395
396 /*
397 * Reserve the bootmap memory.
398 */
399 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
400
401 /*
402 * Reserve initrd memory if needed.
403 */
404 finalize_initrd();
405 }
406
407 #endif /* CONFIG_SGI_IP27 */
408
409 /*
410 * arch_mem_init - initialize memory management subsystem
411 *
412 * o plat_mem_setup() detects the memory configuration and will record detected
413 * memory areas using add_memory_region.
414 *
415 * At this stage the memory configuration of the system is known to the
416 * kernel but generic memory management system is still entirely uninitialized.
417 *
418 * o bootmem_init()
419 * o sparse_init()
420 * o paging_init()
421 *
422 * At this stage the bootmem allocator is ready to use.
423 *
424 * NOTE: historically plat_mem_setup did the entire platform initialization.
425 * This was rather impractical because it meant plat_mem_setup had to
426 * get away without any kind of memory allocator. To keep old code from
427 * breaking plat_setup was just renamed to plat_setup and a second platform
428 * initialization hook for anything else was introduced.
429 */
430
431 static int usermem __initdata;
432
early_parse_mem(char * p)433 static int __init early_parse_mem(char *p)
434 {
435 unsigned long start, size;
436
437 /*
438 * If a user specifies memory size, we
439 * blow away any automatically generated
440 * size.
441 */
442 if (usermem == 0) {
443 boot_mem_map.nr_map = 0;
444 usermem = 1;
445 }
446 start = 0;
447 size = memparse(p, &p);
448 if (*p == '@')
449 start = memparse(p + 1, &p);
450
451 add_memory_region(start, size, BOOT_MEM_RAM);
452 return 0;
453 }
454 early_param("mem", early_parse_mem);
455
arch_mem_init(char ** cmdline_p)456 static void __init arch_mem_init(char **cmdline_p)
457 {
458 extern void plat_mem_setup(void);
459
460 /* call board setup routine */
461 plat_mem_setup();
462
463 pr_info("Determined physical RAM map:\n");
464 print_memory_map();
465
466 #ifdef CONFIG_CMDLINE_BOOL
467 #ifdef CONFIG_CMDLINE_OVERRIDE
468 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
469 #else
470 if (builtin_cmdline[0]) {
471 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
472 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
473 }
474 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
475 #endif
476 #else
477 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
478 #endif
479 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
480
481 *cmdline_p = command_line;
482
483 parse_early_param();
484
485 if (usermem) {
486 pr_info("User-defined physical RAM map:\n");
487 print_memory_map();
488 }
489
490 bootmem_init();
491 device_tree_init();
492 sparse_init();
493 plat_swiotlb_setup();
494 paging_init();
495 }
496
resource_init(void)497 static void __init resource_init(void)
498 {
499 int i;
500
501 if (UNCAC_BASE != IO_BASE)
502 return;
503
504 code_resource.start = __pa_symbol(&_text);
505 code_resource.end = __pa_symbol(&_etext) - 1;
506 data_resource.start = __pa_symbol(&_etext);
507 data_resource.end = __pa_symbol(&_edata) - 1;
508
509 /*
510 * Request address space for all standard RAM.
511 */
512 for (i = 0; i < boot_mem_map.nr_map; i++) {
513 struct resource *res;
514 unsigned long start, end;
515
516 start = boot_mem_map.map[i].addr;
517 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
518 if (start >= HIGHMEM_START)
519 continue;
520 if (end >= HIGHMEM_START)
521 end = HIGHMEM_START - 1;
522
523 res = alloc_bootmem(sizeof(struct resource));
524 switch (boot_mem_map.map[i].type) {
525 case BOOT_MEM_RAM:
526 case BOOT_MEM_ROM_DATA:
527 res->name = "System RAM";
528 break;
529 case BOOT_MEM_RESERVED:
530 default:
531 res->name = "reserved";
532 }
533
534 res->start = start;
535 res->end = end;
536
537 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
538 request_resource(&iomem_resource, res);
539
540 /*
541 * We don't know which RAM region contains kernel data,
542 * so we try it repeatedly and let the resource manager
543 * test it.
544 */
545 request_resource(res, &code_resource);
546 request_resource(res, &data_resource);
547 }
548 }
549
setup_arch(char ** cmdline_p)550 void __init setup_arch(char **cmdline_p)
551 {
552 cpu_probe();
553 prom_init();
554
555 #ifdef CONFIG_EARLY_PRINTK
556 setup_early_printk();
557 #endif
558 cpu_report();
559 check_bugs_early();
560
561 #if defined(CONFIG_VT)
562 #if defined(CONFIG_VGA_CONSOLE)
563 conswitchp = &vga_con;
564 #elif defined(CONFIG_DUMMY_CONSOLE)
565 conswitchp = &dummy_con;
566 #endif
567 #endif
568
569 arch_mem_init(cmdline_p);
570
571 resource_init();
572 plat_smp_setup();
573 }
574
575 unsigned long kernelsp[NR_CPUS];
576 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
577
578 #ifdef CONFIG_DEBUG_FS
579 struct dentry *mips_debugfs_dir;
debugfs_mips(void)580 static int __init debugfs_mips(void)
581 {
582 struct dentry *d;
583
584 d = debugfs_create_dir("mips", NULL);
585 if (!d)
586 return -ENOMEM;
587 mips_debugfs_dir = d;
588 return 0;
589 }
590 arch_initcall(debugfs_mips);
591 #endif
592