Linux-2.6.12-rc2
[linux-2.6.git] / arch / mips / kernel / setup.c
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>
36
37 #include <asm/addrspace.h>
38 #include <asm/bootinfo.h>
39 #include <asm/cpu.h>
40 #include <asm/sections.h>
41 #include <asm/setup.h>
42 #include <asm/system.h>
43
44 struct cpuinfo_mips cpu_data[NR_CPUS];
45
46 EXPORT_SYMBOL(cpu_data);
47
48 #ifdef CONFIG_VT
49 struct screen_info screen_info;
50 #endif
51
52 /*
53  * Despite it's name this variable is even if we don't have PCI
54  */
55 unsigned int PCI_DMA_BUS_IS_PHYS;
56
57 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
58
59 /*
60  * Setup information
61  *
62  * These are initialized so they are in the .data section
63  */
64 unsigned long mips_machtype = MACH_UNKNOWN;
65 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
66
67 EXPORT_SYMBOL(mips_machtype);
68 EXPORT_SYMBOL(mips_machgroup);
69
70 struct boot_mem_map boot_mem_map;
71
72 static char command_line[CL_SIZE];
73        char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE;
74
75 /*
76  * mips_io_port_base is the begin of the address space to which x86 style
77  * I/O ports are mapped.
78  */
79 const unsigned long mips_io_port_base = -1;
80 EXPORT_SYMBOL(mips_io_port_base);
81
82 /*
83  * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped
84  * for the processor.
85  */
86 unsigned long isa_slot_offset;
87 EXPORT_SYMBOL(isa_slot_offset);
88
89 static struct resource code_resource = { .name = "Kernel code", };
90 static struct resource data_resource = { .name = "Kernel data", };
91
92 void __init add_memory_region(phys_t start, phys_t size, long type)
93 {
94         int x = boot_mem_map.nr_map;
95         struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
96
97         /*
98          * Try to merge with previous entry if any.  This is far less than
99          * perfect but is sufficient for most real world cases.
100          */
101         if (x && prev->addr + prev->size == start && prev->type == type) {
102                 prev->size += size;
103                 return;
104         }
105
106         if (x == BOOT_MEM_MAP_MAX) {
107                 printk("Ooops! Too many entries in the memory map!\n");
108                 return;
109         }
110
111         boot_mem_map.map[x].addr = start;
112         boot_mem_map.map[x].size = size;
113         boot_mem_map.map[x].type = type;
114         boot_mem_map.nr_map++;
115 }
116
117 static void __init print_memory_map(void)
118 {
119         int i;
120         const int field = 2 * sizeof(unsigned long);
121
122         for (i = 0; i < boot_mem_map.nr_map; i++) {
123                 printk(" memory: %0*Lx @ %0*Lx ",
124                        field, (unsigned long long) boot_mem_map.map[i].size,
125                        field, (unsigned long long) boot_mem_map.map[i].addr);
126
127                 switch (boot_mem_map.map[i].type) {
128                 case BOOT_MEM_RAM:
129                         printk("(usable)\n");
130                         break;
131                 case BOOT_MEM_ROM_DATA:
132                         printk("(ROM data)\n");
133                         break;
134                 case BOOT_MEM_RESERVED:
135                         printk("(reserved)\n");
136                         break;
137                 default:
138                         printk("type %lu\n", boot_mem_map.map[i].type);
139                         break;
140                 }
141         }
142 }
143
144 static inline void parse_cmdline_early(void)
145 {
146         char c = ' ', *to = command_line, *from = saved_command_line;
147         unsigned long start_at, mem_size;
148         int len = 0;
149         int usermem = 0;
150
151         printk("Determined physical RAM map:\n");
152         print_memory_map();
153
154         for (;;) {
155                 /*
156                  * "mem=XXX[kKmM]" defines a memory region from
157                  * 0 to <XXX>, overriding the determined size.
158                  * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
159                  * <YYY> to <YYY>+<XXX>, overriding the determined size.
160                  */
161                 if (c == ' ' && !memcmp(from, "mem=", 4)) {
162                         if (to != command_line)
163                                 to--;
164                         /*
165                          * If a user specifies memory size, we
166                          * blow away any automatically generated
167                          * size.
168                          */
169                         if (usermem == 0) {
170                                 boot_mem_map.nr_map = 0;
171                                 usermem = 1;
172                         }
173                         mem_size = memparse(from + 4, &from);
174                         if (*from == '@')
175                                 start_at = memparse(from + 1, &from);
176                         else
177                                 start_at = 0;
178                         add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
179                 }
180                 c = *(from++);
181                 if (!c)
182                         break;
183                 if (CL_SIZE <= ++len)
184                         break;
185                 *(to++) = c;
186         }
187         *to = '\0';
188
189         if (usermem) {
190                 printk("User-defined physical RAM map:\n");
191                 print_memory_map();
192         }
193 }
194
195 static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end)
196 {
197         /*
198          * "rd_start=0xNNNNNNNN" defines the memory address of an initrd
199          * "rd_size=0xNN" it's size
200          */
201         unsigned long start = 0;
202         unsigned long size = 0;
203         unsigned long end;
204         char cmd_line[CL_SIZE];
205         char *start_str;
206         char *size_str;
207         char *tmp;
208
209         strcpy(cmd_line, command_line);
210         *command_line = 0;
211         tmp = cmd_line;
212         /* Ignore "rd_start=" strings in other parameters. */
213         start_str = strstr(cmd_line, "rd_start=");
214         if (start_str && start_str != cmd_line && *(start_str - 1) != ' ')
215                 start_str = strstr(start_str, " rd_start=");
216         while (start_str) {
217                 if (start_str != cmd_line)
218                         strncat(command_line, tmp, start_str - tmp);
219                 start = memparse(start_str + 9, &start_str);
220                 tmp = start_str + 1;
221                 start_str = strstr(start_str, " rd_start=");
222         }
223         if (*tmp)
224                 strcat(command_line, tmp);
225
226         strcpy(cmd_line, command_line);
227         *command_line = 0;
228         tmp = cmd_line;
229         /* Ignore "rd_size" strings in other parameters. */
230         size_str = strstr(cmd_line, "rd_size=");
231         if (size_str && size_str != cmd_line && *(size_str - 1) != ' ')
232                 size_str = strstr(size_str, " rd_size=");
233         while (size_str) {
234                 if (size_str != cmd_line)
235                         strncat(command_line, tmp, size_str - tmp);
236                 size = memparse(size_str + 8, &size_str);
237                 tmp = size_str + 1;
238                 size_str = strstr(size_str, " rd_size=");
239         }
240         if (*tmp)
241                 strcat(command_line, tmp);
242
243 #ifdef CONFIG_MIPS64
244         /* HACK: Guess if the sign extension was forgotten */
245         if (start > 0x0000000080000000 && start < 0x00000000ffffffff)
246                 start |= 0xffffffff00000000;
247 #endif
248
249         end = start + size;
250         if (start && end) {
251                 *rd_start = start;
252                 *rd_end = end;
253                 return 1;
254         }
255         return 0;
256 }
257
258 #define PFN_UP(x)       (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
259 #define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
260 #define PFN_PHYS(x)     ((x) << PAGE_SHIFT)
261
262 #define MAXMEM          HIGHMEM_START
263 #define MAXMEM_PFN      PFN_DOWN(MAXMEM)
264
265 static inline void bootmem_init(void)
266 {
267         unsigned long start_pfn;
268         unsigned long reserved_end = (unsigned long)&_end;
269 #ifndef CONFIG_SGI_IP27
270         unsigned long first_usable_pfn;
271         unsigned long bootmap_size;
272         int i;
273 #endif
274 #ifdef CONFIG_BLK_DEV_INITRD
275         int initrd_reserve_bootmem = 0;
276
277         /* Board specific code should have set up initrd_start and initrd_end */
278         ROOT_DEV = Root_RAM0;
279         if (parse_rd_cmdline(&initrd_start, &initrd_end)) {
280                 reserved_end = max(reserved_end, initrd_end);
281                 initrd_reserve_bootmem = 1;
282         } else {
283                 unsigned long tmp;
284                 u32 *initrd_header;
285
286                 tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
287                 if (tmp < reserved_end)
288                         tmp += PAGE_SIZE;
289                 initrd_header = (u32 *)tmp;
290                 if (initrd_header[0] == 0x494E5244) {
291                         initrd_start = (unsigned long)&initrd_header[2];
292                         initrd_end = initrd_start + initrd_header[1];
293                         reserved_end = max(reserved_end, initrd_end);
294                         initrd_reserve_bootmem = 1;
295                 }
296         }
297 #endif  /* CONFIG_BLK_DEV_INITRD */
298
299         /*
300          * Partially used pages are not usable - thus
301          * we are rounding upwards.
302          */
303         start_pfn = PFN_UP(CPHYSADDR(reserved_end));
304
305 #ifndef CONFIG_SGI_IP27
306         /* Find the highest page frame number we have available.  */
307         max_pfn = 0;
308         first_usable_pfn = -1UL;
309         for (i = 0; i < boot_mem_map.nr_map; i++) {
310                 unsigned long start, end;
311
312                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
313                         continue;
314
315                 start = PFN_UP(boot_mem_map.map[i].addr);
316                 end = PFN_DOWN(boot_mem_map.map[i].addr
317                       + boot_mem_map.map[i].size);
318
319                 if (start >= end)
320                         continue;
321                 if (end > max_pfn)
322                         max_pfn = end;
323                 if (start < first_usable_pfn) {
324                         if (start > start_pfn) {
325                                 first_usable_pfn = start;
326                         } else if (end > start_pfn) {
327                                 first_usable_pfn = start_pfn;
328                         }
329                 }
330         }
331
332         /*
333          * Determine low and high memory ranges
334          */
335         max_low_pfn = max_pfn;
336         if (max_low_pfn > MAXMEM_PFN) {
337                 max_low_pfn = MAXMEM_PFN;
338 #ifndef CONFIG_HIGHMEM
339                 /* Maximum memory usable is what is directly addressable */
340                 printk(KERN_WARNING "Warning only %ldMB will be used.\n",
341                        MAXMEM >> 20);
342                 printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
343 #endif
344         }
345
346 #ifdef CONFIG_HIGHMEM
347         /*
348          * Crude, we really should make a better attempt at detecting
349          * highstart_pfn
350          */
351         highstart_pfn = highend_pfn = max_pfn;
352         if (max_pfn > MAXMEM_PFN) {
353                 highstart_pfn = MAXMEM_PFN;
354                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
355                        (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
356         }
357 #endif
358
359         /* Initialize the boot-time allocator with low memory only.  */
360         bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
361
362         /*
363          * Register fully available low RAM pages with the bootmem allocator.
364          */
365         for (i = 0; i < boot_mem_map.nr_map; i++) {
366                 unsigned long curr_pfn, last_pfn, size;
367
368                 /*
369                  * Reserve usable memory.
370                  */
371                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
372                         continue;
373
374                 /*
375                  * We are rounding up the start address of usable memory:
376                  */
377                 curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
378                 if (curr_pfn >= max_low_pfn)
379                         continue;
380                 if (curr_pfn < start_pfn)
381                         curr_pfn = start_pfn;
382
383                 /*
384                  * ... and at the end of the usable range downwards:
385                  */
386                 last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
387                                     + boot_mem_map.map[i].size);
388
389                 if (last_pfn > max_low_pfn)
390                         last_pfn = max_low_pfn;
391
392                 /*
393                  * Only register lowmem part of lowmem segment with bootmem.
394                  */
395                 size = last_pfn - curr_pfn;
396                 if (curr_pfn > PFN_DOWN(HIGHMEM_START))
397                         continue;
398                 if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
399                         size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
400                 if (!size)
401                         continue;
402
403                 /*
404                  * ... finally, did all the rounding and playing
405                  * around just make the area go away?
406                  */
407                 if (last_pfn <= curr_pfn)
408                         continue;
409
410                 /* Register lowmem ranges */
411                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
412         }
413
414         /* Reserve the bootmap memory.  */
415         reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
416 #endif /* CONFIG_SGI_IP27 */
417
418 #ifdef CONFIG_BLK_DEV_INITRD
419         initrd_below_start_ok = 1;
420         if (initrd_start) {
421                 unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
422                 printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
423                        (void *)initrd_start, initrd_size);
424
425                 if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) {
426                         printk("initrd extends beyond end of memory "
427                                "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n",
428                                sizeof(long) * 2,
429                                (unsigned long long)CPHYSADDR(initrd_end),
430                                sizeof(long) * 2,
431                                (unsigned long long)PFN_PHYS(max_low_pfn));
432                         initrd_start = initrd_end = 0;
433                         initrd_reserve_bootmem = 0;
434                 }
435
436                 if (initrd_reserve_bootmem)
437                         reserve_bootmem(CPHYSADDR(initrd_start), initrd_size);
438         }
439 #endif /* CONFIG_BLK_DEV_INITRD  */
440 }
441
442 static inline void resource_init(void)
443 {
444         int i;
445
446 #if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
447         /*
448          * The 64bit code in 32bit object format trick can't represent
449          * 64bit wide relocations for linker script symbols.
450          */
451         code_resource.start = CPHYSADDR(&_text);
452         code_resource.end = CPHYSADDR(&_etext) - 1;
453         data_resource.start = CPHYSADDR(&_etext);
454         data_resource.end = CPHYSADDR(&_edata) - 1;
455 #else
456         code_resource.start = virt_to_phys(&_text);
457         code_resource.end = virt_to_phys(&_etext) - 1;
458         data_resource.start = virt_to_phys(&_etext);
459         data_resource.end = virt_to_phys(&_edata) - 1;
460 #endif
461
462         /*
463          * Request address space for all standard RAM.
464          */
465         for (i = 0; i < boot_mem_map.nr_map; i++) {
466                 struct resource *res;
467                 unsigned long start, end;
468
469                 start = boot_mem_map.map[i].addr;
470                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
471                 if (start >= MAXMEM)
472                         continue;
473                 if (end >= MAXMEM)
474                         end = MAXMEM - 1;
475
476                 res = alloc_bootmem(sizeof(struct resource));
477                 switch (boot_mem_map.map[i].type) {
478                 case BOOT_MEM_RAM:
479                 case BOOT_MEM_ROM_DATA:
480                         res->name = "System RAM";
481                         break;
482                 case BOOT_MEM_RESERVED:
483                 default:
484                         res->name = "reserved";
485                 }
486
487                 res->start = start;
488                 res->end = end;
489
490                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
491                 request_resource(&iomem_resource, res);
492
493                 /*
494                  *  We don't know which RAM region contains kernel data,
495                  *  so we try it repeatedly and let the resource manager
496                  *  test it.
497                  */
498                 request_resource(res, &code_resource);
499                 request_resource(res, &data_resource);
500         }
501 }
502
503 #undef PFN_UP
504 #undef PFN_DOWN
505 #undef PFN_PHYS
506
507 #undef MAXMEM
508 #undef MAXMEM_PFN
509
510 static int __initdata earlyinit_debug;
511
512 static int __init earlyinit_debug_setup(char *str)
513 {
514         earlyinit_debug = 1;
515         return 1;
516 }
517 __setup("earlyinit_debug", earlyinit_debug_setup);
518
519 extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
520
521 static void __init do_earlyinitcalls(void)
522 {
523         initcall_t *call, *start, *end;
524
525         start = &__earlyinitcall_start;
526         end = &__earlyinitcall_end;
527
528         for (call = start; call < end; call++) {
529                 if (earlyinit_debug)
530                         printk("calling earlyinitcall 0x%p\n", *call);
531
532                 (*call)();
533         }
534 }
535
536 void __init setup_arch(char **cmdline_p)
537 {
538         cpu_probe();
539         prom_init();
540         cpu_report();
541
542 #if defined(CONFIG_VT)
543 #if defined(CONFIG_VGA_CONSOLE)
544         conswitchp = &vga_con;
545 #elif defined(CONFIG_DUMMY_CONSOLE)
546         conswitchp = &dummy_con;
547 #endif
548 #endif
549
550         /* call board setup routine */
551         do_earlyinitcalls();
552
553         strlcpy(command_line, arcs_cmdline, sizeof(command_line));
554         strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
555
556         *cmdline_p = command_line;
557
558         parse_cmdline_early();
559         bootmem_init();
560         paging_init();
561         resource_init();
562 }
563
564 int __init fpu_disable(char *s)
565 {
566         cpu_data[0].options &= ~MIPS_CPU_FPU;
567
568         return 1;
569 }
570
571 __setup("nofpu", fpu_disable);