blob: 8f6e89697ccfd5fc649f9446f8d26038615e1fbc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/init.h>
14#include <linux/ioport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/module.h>
Jon Smirl894673e2006-07-10 04:44:13 -070016#include <linux/screen_info.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/bootmem.h>
18#include <linux/initrd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/root_dev.h>
20#include <linux/highmem.h>
21#include <linux/console.h>
Dave Hansen22a98352006-03-27 01:16:04 -080022#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <asm/addrspace.h>
25#include <asm/bootinfo.h>
Ralf Baechleec74e362005-07-13 11:48:45 +000026#include <asm/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <asm/cpu.h>
28#include <asm/sections.h>
29#include <asm/setup.h>
30#include <asm/system.h>
31
Ralf Baechleec74e362005-07-13 11:48:45 +000032struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34EXPORT_SYMBOL(cpu_data);
35
36#ifdef CONFIG_VT
37struct screen_info screen_info;
38#endif
39
40/*
41 * Despite it's name this variable is even if we don't have PCI
42 */
43unsigned int PCI_DMA_BUS_IS_PHYS;
44
45EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
46
47/*
48 * Setup information
49 *
50 * These are initialized so they are in the .data section
51 */
Ralf Baechleec74e362005-07-13 11:48:45 +000052unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
53unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55EXPORT_SYMBOL(mips_machtype);
56EXPORT_SYMBOL(mips_machgroup);
57
58struct boot_mem_map boot_mem_map;
59
60static 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 */
Ralf Baechleec74e362005-07-13 11:48:45 +000067const unsigned long mips_io_port_base __read_mostly = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068EXPORT_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 */
74unsigned long isa_slot_offset;
75EXPORT_SYMBOL(isa_slot_offset);
76
77static struct resource code_resource = { .name = "Kernel code", };
78static struct resource data_resource = { .name = "Kernel data", };
79
80void __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
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +020085 /* Sanity check */
86 if (start + size < start) {
87 printk("Trying to add an invalid memory region, skipped\n");
88 return;
89 }
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 /*
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
111static 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
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200138/*
139 * Manage initrd
140 */
141#ifdef CONFIG_BLK_DEV_INITRD
142
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200143static int __init rd_start_early(char *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200145 unsigned long start = memparse(p, &p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
Ralf Baechle875d43e2005-09-03 15:56:16 -0700147#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 /* HACK: Guess if the sign extension was forgotten */
149 if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
Atsushi Nemoto460c0422006-06-01 01:00:39 +0900150 start |= 0xffffffff00000000UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151#endif
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200152 initrd_start = start;
153 initrd_end += start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return 0;
156}
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200157early_param("rd_start", rd_start_early);
158
159static int __init rd_size_early(char *p)
160{
161 initrd_end += memparse(p, &p);
162
163 return 0;
164}
165early_param("rd_size", rd_size_early);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200167static unsigned long __init init_initrd(void)
168{
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200169 unsigned long tmp, end, size;
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200170 u32 *initrd_header;
171
172 ROOT_DEV = Root_RAM0;
173
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200174 /*
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200175 * Board specific code or command line parser should have
176 * already set up initrd_start and initrd_end. In these cases
177 * perfom sanity checks and use them if all looks good.
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200178 */
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200179 size = initrd_end - initrd_start;
180 if (initrd_end == 0 || size == 0) {
181 initrd_start = 0;
182 initrd_end = 0;
183 } else
184 return initrd_end;
185
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200186 end = (unsigned long)&_end;
187 tmp = PAGE_ALIGN(end) - sizeof(u32) * 2;
188 if (tmp < end)
189 tmp += PAGE_SIZE;
190
191 initrd_header = (u32 *)tmp;
192 if (initrd_header[0] == 0x494E5244) {
193 initrd_start = (unsigned long)&initrd_header[2];
194 initrd_end = initrd_start + initrd_header[1];
195 }
196 return initrd_end;
197}
198
199static void __init finalize_initrd(void)
200{
201 unsigned long size = initrd_end - initrd_start;
202
203 if (size == 0) {
204 printk(KERN_INFO "Initrd not found or empty");
205 goto disable;
206 }
207 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
208 printk("Initrd extends beyond end of memory");
209 goto disable;
210 }
211
212 reserve_bootmem(CPHYSADDR(initrd_start), size);
213 initrd_below_start_ok = 1;
214
215 printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
216 initrd_start, size);
217 return;
218disable:
219 printk(" - disabling initrd\n");
220 initrd_start = 0;
221 initrd_end = 0;
222}
223
224#else /* !CONFIG_BLK_DEV_INITRD */
225
Ralf Baechle9ba126c2006-10-13 11:22:52 +0100226static unsigned long __init init_initrd(void)
227{
228 return 0;
229}
230
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200231#define finalize_initrd() do {} while (0)
232
233#endif
234
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200235/*
236 * Initialize the bootmem allocator. It also setup initrd related data
237 * if needed.
238 */
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200239#ifdef CONFIG_SGI_IP27
240
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200241static void __init bootmem_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200243 init_initrd();
244 finalize_initrd();
245}
246
247#else /* !CONFIG_SGI_IP27 */
248
249static void __init bootmem_init(void)
250{
251 unsigned long reserved_end;
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200252 unsigned long highest = 0;
253 unsigned long mapstart = -1UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 unsigned long bootmap_size;
255 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200257 /*
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200258 * Init any data related to initrd. It's a nop if INITRD is
259 * not selected. Once that done we can determine the low bound
260 * of usable memory.
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200261 */
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200262 reserved_end = init_initrd();
263 reserved_end = PFN_UP(CPHYSADDR(max(reserved_end, (unsigned long)&_end)));
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200264
265 /*
266 * Find the highest page frame number we have available.
267 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 for (i = 0; i < boot_mem_map.nr_map; i++) {
269 unsigned long start, end;
270
271 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
272 continue;
273
274 start = PFN_UP(boot_mem_map.map[i].addr);
275 end = PFN_DOWN(boot_mem_map.map[i].addr
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200276 + boot_mem_map.map[i].size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200278 if (end > highest)
279 highest = end;
280 if (end <= reserved_end)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 continue;
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200282 if (start >= mapstart)
283 continue;
284 mapstart = max(reserved_end, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
286
287 /*
288 * Determine low and high memory ranges
289 */
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200290 if (highest > PFN_DOWN(HIGHMEM_START)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291#ifdef CONFIG_HIGHMEM
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200292 highstart_pfn = PFN_DOWN(HIGHMEM_START);
293 highend_pfn = highest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294#endif
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200295 highest = PFN_DOWN(HIGHMEM_START);
296 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200298 /*
299 * Initialize the boot-time allocator with low memory only.
300 */
301 bootmap_size = init_bootmem(mapstart, highest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 /*
304 * Register fully available low RAM pages with the bootmem allocator.
305 */
306 for (i = 0; i < boot_mem_map.nr_map; i++) {
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200307 unsigned long start, end, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 /*
310 * Reserve usable memory.
311 */
312 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
313 continue;
314
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200315 start = PFN_UP(boot_mem_map.map[i].addr);
316 end = PFN_DOWN(boot_mem_map.map[i].addr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 + boot_mem_map.map[i].size);
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200318 /*
319 * We are rounding up the start address of usable memory
320 * and at the end of the usable range downwards.
321 */
322 if (start >= max_low_pfn)
323 continue;
324 if (start < reserved_end)
325 start = reserved_end;
326 if (end > max_low_pfn)
327 end = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 /*
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200330 * ... finally, is the area going away?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 */
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200332 if (end <= start)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 continue;
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200334 size = end - start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 /* Register lowmem ranges */
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200337 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
338 memory_present(0, start, end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 }
340
Franck Bui-Huub6f1f0d2006-08-11 17:51:48 +0200341 /*
342 * Reserve the bootmap memory.
343 */
344 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
345
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200346 /*
347 * Reserve initrd memory if needed.
348 */
349 finalize_initrd();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350}
351
Franck Bui-Huud2043ca2006-08-11 17:51:49 +0200352#endif /* CONFIG_SGI_IP27 */
353
Ralf Baechle2925aba2006-06-18 01:32:22 +0100354/*
355 * arch_mem_init - initialize memory managment subsystem
356 *
357 * o plat_mem_setup() detects the memory configuration and will record detected
358 * memory areas using add_memory_region.
Ralf Baechle2925aba2006-06-18 01:32:22 +0100359 *
360 * At this stage the memory configuration of the system is known to the
361 * kernel but generic memory managment system is still entirely uninitialized.
362 *
363 * o bootmem_init()
364 * o sparse_init()
365 * o paging_init()
366 *
367 * At this stage the bootmem allocator is ready to use.
368 *
369 * NOTE: historically plat_mem_setup did the entire platform initialization.
370 * This was rather impractical because it meant plat_mem_setup had to
371 * get away without any kind of memory allocator. To keep old code from
372 * breaking plat_setup was just renamed to plat_setup and a second platform
373 * initialization hook for anything else was introduced.
374 */
375
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200376static int usermem __initdata = 0;
377
378static int __init early_parse_mem(char *p)
379{
380 unsigned long start, size;
381
382 /*
383 * If a user specifies memory size, we
384 * blow away any automatically generated
385 * size.
386 */
387 if (usermem == 0) {
388 boot_mem_map.nr_map = 0;
389 usermem = 1;
390 }
391 start = 0;
392 size = memparse(p, &p);
393 if (*p == '@')
394 start = memparse(p + 1, &p);
395
396 add_memory_region(start, size, BOOT_MEM_RAM);
397 return 0;
398}
399early_param("mem", early_parse_mem);
Ralf Baechle2925aba2006-06-18 01:32:22 +0100400
401static void __init arch_mem_init(char **cmdline_p)
402{
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200403 extern void plat_mem_setup(void);
404
Ralf Baechle2925aba2006-06-18 01:32:22 +0100405 /* call board setup routine */
406 plat_mem_setup();
407
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200408 printk("Determined physical RAM map:\n");
409 print_memory_map();
410
Ralf Baechle2925aba2006-06-18 01:32:22 +0100411 strlcpy(command_line, arcs_cmdline, sizeof(command_line));
412 strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
413
414 *cmdline_p = command_line;
415
Franck Bui-Huua09fc442006-08-11 17:51:53 +0200416 parse_early_param();
417
418 if (usermem) {
419 printk("User-defined physical RAM map:\n");
420 print_memory_map();
421 }
422
Ralf Baechle2925aba2006-06-18 01:32:22 +0100423 bootmem_init();
424 sparse_init();
425 paging_init();
426}
427
Franck Bui-Huu8df32c62006-08-11 17:51:51 +0200428static void __init resource_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 int i;
431
Ralf Baechle6adb5fe2006-06-20 12:47:53 +0100432 if (UNCAC_BASE != IO_BASE)
433 return;
434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 code_resource.start = virt_to_phys(&_text);
436 code_resource.end = virt_to_phys(&_etext) - 1;
437 data_resource.start = virt_to_phys(&_etext);
438 data_resource.end = virt_to_phys(&_edata) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
440 /*
441 * Request address space for all standard RAM.
442 */
443 for (i = 0; i < boot_mem_map.nr_map; i++) {
444 struct resource *res;
445 unsigned long start, end;
446
447 start = boot_mem_map.map[i].addr;
448 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
Franck Bui-Huu1c6fd442006-08-11 17:51:52 +0200449 if (start >= HIGHMEM_START)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 continue;
Franck Bui-Huu1c6fd442006-08-11 17:51:52 +0200451 if (end >= HIGHMEM_START)
452 end = HIGHMEM_START - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 res = alloc_bootmem(sizeof(struct resource));
455 switch (boot_mem_map.map[i].type) {
456 case BOOT_MEM_RAM:
457 case BOOT_MEM_ROM_DATA:
458 res->name = "System RAM";
459 break;
460 case BOOT_MEM_RESERVED:
461 default:
462 res->name = "reserved";
463 }
464
465 res->start = start;
466 res->end = end;
467
468 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
469 request_resource(&iomem_resource, res);
470
471 /*
472 * We don't know which RAM region contains kernel data,
473 * so we try it repeatedly and let the resource manager
474 * test it.
475 */
476 request_resource(res, &code_resource);
477 request_resource(res, &data_resource);
478 }
479}
480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481void __init setup_arch(char **cmdline_p)
482{
483 cpu_probe();
484 prom_init();
485 cpu_report();
486
487#if defined(CONFIG_VT)
488#if defined(CONFIG_VGA_CONSOLE)
489 conswitchp = &vga_con;
490#elif defined(CONFIG_DUMMY_CONSOLE)
491 conswitchp = &dummy_con;
492#endif
493#endif
494
Ralf Baechle2925aba2006-06-18 01:32:22 +0100495 arch_mem_init(cmdline_p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 resource_init();
Ralf Baechle9b6695a2006-02-23 12:23:27 +0000498#ifdef CONFIG_SMP
499 plat_smp_setup();
500#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
503int __init fpu_disable(char *s)
504{
Ralf Baechlef088fc82006-04-05 09:45:47 +0100505 int i;
506
507 for (i = 0; i < NR_CPUS; i++)
508 cpu_data[i].options &= ~MIPS_CPU_FPU;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 return 1;
511}
512
513__setup("nofpu", fpu_disable);
Ralf Baechlee50c0a82005-05-31 11:49:19 +0000514
515int __init dsp_disable(char *s)
516{
517 cpu_data[0].ases &= ~MIPS_ASE_DSP;
518
519 return 1;
520}
521
522__setup("nodsp", dsp_disable);