]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/arm/kernel/setup.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge master.kernel.org:/home/rmk/linux-2.6-arm
[mirror_ubuntu-bionic-kernel.git] / arch / arm / kernel / setup.c
1 /*
2 * linux/arch/arm/kernel/setup.c
3 *
4 * Copyright (C) 1995-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10 #include <linux/config.h>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/ioport.h>
15 #include <linux/delay.h>
16 #include <linux/utsname.h>
17 #include <linux/initrd.h>
18 #include <linux/console.h>
19 #include <linux/bootmem.h>
20 #include <linux/seq_file.h>
21 #include <linux/tty.h>
22 #include <linux/init.h>
23 #include <linux/root_dev.h>
24 #include <linux/cpu.h>
25 #include <linux/interrupt.h>
26
27 #include <asm/cpu.h>
28 #include <asm/elf.h>
29 #include <asm/procinfo.h>
30 #include <asm/setup.h>
31 #include <asm/mach-types.h>
32 #include <asm/cacheflush.h>
33 #include <asm/tlbflush.h>
34
35 #include <asm/mach/arch.h>
36 #include <asm/mach/irq.h>
37 #include <asm/mach/time.h>
38
39 #ifndef MEM_SIZE
40 #define MEM_SIZE (16*1024*1024)
41 #endif
42
43 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
44 char fpe_type[8];
45
46 static int __init fpe_setup(char *line)
47 {
48 memcpy(fpe_type, line, 8);
49 return 1;
50 }
51
52 __setup("fpe=", fpe_setup);
53 #endif
54
55 extern unsigned int mem_fclk_21285;
56 extern void paging_init(struct meminfo *, struct machine_desc *desc);
57 extern void convert_to_tag_list(struct tag *tags);
58 extern void squash_mem_tags(struct tag *tag);
59 extern void reboot_setup(char *str);
60 extern int root_mountflags;
61 extern void _stext, _text, _etext, __data_start, _edata, _end;
62
63 unsigned int processor_id;
64 unsigned int __machine_arch_type;
65 EXPORT_SYMBOL(__machine_arch_type);
66
67 unsigned int system_rev;
68 EXPORT_SYMBOL(system_rev);
69
70 unsigned int system_serial_low;
71 EXPORT_SYMBOL(system_serial_low);
72
73 unsigned int system_serial_high;
74 EXPORT_SYMBOL(system_serial_high);
75
76 unsigned int elf_hwcap;
77 EXPORT_SYMBOL(elf_hwcap);
78
79
80 #ifdef MULTI_CPU
81 struct processor processor;
82 #endif
83 #ifdef MULTI_TLB
84 struct cpu_tlb_fns cpu_tlb;
85 #endif
86 #ifdef MULTI_USER
87 struct cpu_user_fns cpu_user;
88 #endif
89 #ifdef MULTI_CACHE
90 struct cpu_cache_fns cpu_cache;
91 #endif
92
93 struct stack {
94 u32 irq[3];
95 u32 abt[3];
96 u32 und[3];
97 } ____cacheline_aligned;
98
99 static struct stack stacks[NR_CPUS];
100
101 char elf_platform[ELF_PLATFORM_SIZE];
102 EXPORT_SYMBOL(elf_platform);
103
104 unsigned long phys_initrd_start __initdata = 0;
105 unsigned long phys_initrd_size __initdata = 0;
106
107 static struct meminfo meminfo __initdata = { 0, };
108 static const char *cpu_name;
109 static const char *machine_name;
110 static char command_line[COMMAND_LINE_SIZE];
111
112 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
113 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
114 #define ENDIANNESS ((char)endian_test.l)
115
116 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
117
118 /*
119 * Standard memory resources
120 */
121 static struct resource mem_res[] = {
122 { "Video RAM", 0, 0, IORESOURCE_MEM },
123 { "Kernel text", 0, 0, IORESOURCE_MEM },
124 { "Kernel data", 0, 0, IORESOURCE_MEM }
125 };
126
127 #define video_ram mem_res[0]
128 #define kernel_code mem_res[1]
129 #define kernel_data mem_res[2]
130
131 static struct resource io_res[] = {
132 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
133 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
134 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
135 };
136
137 #define lp0 io_res[0]
138 #define lp1 io_res[1]
139 #define lp2 io_res[2]
140
141 static const char *cache_types[16] = {
142 "write-through",
143 "write-back",
144 "write-back",
145 "undefined 3",
146 "undefined 4",
147 "undefined 5",
148 "write-back",
149 "write-back",
150 "undefined 8",
151 "undefined 9",
152 "undefined 10",
153 "undefined 11",
154 "undefined 12",
155 "undefined 13",
156 "write-back",
157 "undefined 15",
158 };
159
160 static const char *cache_clean[16] = {
161 "not required",
162 "read-block",
163 "cp15 c7 ops",
164 "undefined 3",
165 "undefined 4",
166 "undefined 5",
167 "cp15 c7 ops",
168 "cp15 c7 ops",
169 "undefined 8",
170 "undefined 9",
171 "undefined 10",
172 "undefined 11",
173 "undefined 12",
174 "undefined 13",
175 "cp15 c7 ops",
176 "undefined 15",
177 };
178
179 static const char *cache_lockdown[16] = {
180 "not supported",
181 "not supported",
182 "not supported",
183 "undefined 3",
184 "undefined 4",
185 "undefined 5",
186 "format A",
187 "format B",
188 "undefined 8",
189 "undefined 9",
190 "undefined 10",
191 "undefined 11",
192 "undefined 12",
193 "undefined 13",
194 "format C",
195 "undefined 15",
196 };
197
198 static const char *proc_arch[] = {
199 "undefined/unknown",
200 "3",
201 "4",
202 "4T",
203 "5",
204 "5T",
205 "5TE",
206 "5TEJ",
207 "6TEJ",
208 "?(10)",
209 "?(11)",
210 "?(12)",
211 "?(13)",
212 "?(14)",
213 "?(15)",
214 "?(16)",
215 "?(17)",
216 };
217
218 #define CACHE_TYPE(x) (((x) >> 25) & 15)
219 #define CACHE_S(x) ((x) & (1 << 24))
220 #define CACHE_DSIZE(x) (((x) >> 12) & 4095) /* only if S=1 */
221 #define CACHE_ISIZE(x) ((x) & 4095)
222
223 #define CACHE_SIZE(y) (((y) >> 6) & 7)
224 #define CACHE_ASSOC(y) (((y) >> 3) & 7)
225 #define CACHE_M(y) ((y) & (1 << 2))
226 #define CACHE_LINE(y) ((y) & 3)
227
228 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
229 {
230 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
231
232 printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
233 cpu, prefix,
234 mult << (8 + CACHE_SIZE(cache)),
235 (mult << CACHE_ASSOC(cache)) >> 1,
236 8 << CACHE_LINE(cache),
237 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
238 CACHE_LINE(cache)));
239 }
240
241 static void __init dump_cpu_info(int cpu)
242 {
243 unsigned int info = read_cpuid(CPUID_CACHETYPE);
244
245 if (info != processor_id) {
246 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
247 cache_types[CACHE_TYPE(info)]);
248 if (CACHE_S(info)) {
249 dump_cache("I cache", cpu, CACHE_ISIZE(info));
250 dump_cache("D cache", cpu, CACHE_DSIZE(info));
251 } else {
252 dump_cache("cache", cpu, CACHE_ISIZE(info));
253 }
254 }
255 }
256
257 int cpu_architecture(void)
258 {
259 int cpu_arch;
260
261 if ((processor_id & 0x0000f000) == 0) {
262 cpu_arch = CPU_ARCH_UNKNOWN;
263 } else if ((processor_id & 0x0000f000) == 0x00007000) {
264 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
265 } else {
266 cpu_arch = (processor_id >> 16) & 7;
267 if (cpu_arch)
268 cpu_arch += CPU_ARCH_ARMv3;
269 }
270
271 return cpu_arch;
272 }
273
274 /*
275 * These functions re-use the assembly code in head.S, which
276 * already provide the required functionality.
277 */
278 extern struct proc_info_list *lookup_processor_type(void);
279 extern struct machine_desc *lookup_machine_type(unsigned int);
280
281 static void __init setup_processor(void)
282 {
283 struct proc_info_list *list;
284
285 /*
286 * locate processor in the list of supported processor
287 * types. The linker builds this table for us from the
288 * entries in arch/arm/mm/proc-*.S
289 */
290 list = lookup_processor_type();
291 if (!list) {
292 printk("CPU configuration botched (ID %08x), unable "
293 "to continue.\n", processor_id);
294 while (1);
295 }
296
297 cpu_name = list->cpu_name;
298
299 #ifdef MULTI_CPU
300 processor = *list->proc;
301 #endif
302 #ifdef MULTI_TLB
303 cpu_tlb = *list->tlb;
304 #endif
305 #ifdef MULTI_USER
306 cpu_user = *list->user;
307 #endif
308 #ifdef MULTI_CACHE
309 cpu_cache = *list->cache;
310 #endif
311
312 printk("CPU: %s [%08x] revision %d (ARMv%s)\n",
313 cpu_name, processor_id, (int)processor_id & 15,
314 proc_arch[cpu_architecture()]);
315
316 sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
317 sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
318 elf_hwcap = list->elf_hwcap;
319
320 cpu_proc_init();
321 }
322
323 /*
324 * cpu_init - initialise one CPU.
325 *
326 * cpu_init dumps the cache information, initialises SMP specific
327 * information, and sets up the per-CPU stacks.
328 */
329 void cpu_init(void)
330 {
331 unsigned int cpu = smp_processor_id();
332 struct stack *stk = &stacks[cpu];
333
334 if (cpu >= NR_CPUS) {
335 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
336 BUG();
337 }
338
339 if (system_state == SYSTEM_BOOTING)
340 dump_cpu_info(cpu);
341
342 /*
343 * setup stacks for re-entrant exception handlers
344 */
345 __asm__ (
346 "msr cpsr_c, %1\n\t"
347 "add sp, %0, %2\n\t"
348 "msr cpsr_c, %3\n\t"
349 "add sp, %0, %4\n\t"
350 "msr cpsr_c, %5\n\t"
351 "add sp, %0, %6\n\t"
352 "msr cpsr_c, %7"
353 :
354 : "r" (stk),
355 "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
356 "I" (offsetof(struct stack, irq[0])),
357 "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
358 "I" (offsetof(struct stack, abt[0])),
359 "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
360 "I" (offsetof(struct stack, und[0])),
361 "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
362 : "r14");
363 }
364
365 static struct machine_desc * __init setup_machine(unsigned int nr)
366 {
367 struct machine_desc *list;
368
369 /*
370 * locate machine in the list of supported machines.
371 */
372 list = lookup_machine_type(nr);
373 if (!list) {
374 printk("Machine configuration botched (nr %d), unable "
375 "to continue.\n", nr);
376 while (1);
377 }
378
379 printk("Machine: %s\n", list->name);
380
381 return list;
382 }
383
384 static void __init early_initrd(char **p)
385 {
386 unsigned long start, size;
387
388 start = memparse(*p, p);
389 if (**p == ',') {
390 size = memparse((*p) + 1, p);
391
392 phys_initrd_start = start;
393 phys_initrd_size = size;
394 }
395 }
396 __early_param("initrd=", early_initrd);
397
398 static void __init add_memory(unsigned long start, unsigned long size)
399 {
400 /*
401 * Ensure that start/size are aligned to a page boundary.
402 * Size is appropriately rounded down, start is rounded up.
403 */
404 size -= start & ~PAGE_MASK;
405
406 meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
407 meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
408 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
409 meminfo.nr_banks += 1;
410 }
411
412 /*
413 * Pick out the memory size. We look for mem=size@start,
414 * where start and size are "size[KkMm]"
415 */
416 static void __init early_mem(char **p)
417 {
418 static int usermem __initdata = 0;
419 unsigned long size, start;
420
421 /*
422 * If the user specifies memory size, we
423 * blow away any automatically generated
424 * size.
425 */
426 if (usermem == 0) {
427 usermem = 1;
428 meminfo.nr_banks = 0;
429 }
430
431 start = PHYS_OFFSET;
432 size = memparse(*p, p);
433 if (**p == '@')
434 start = memparse(*p + 1, p);
435
436 add_memory(start, size);
437 }
438 __early_param("mem=", early_mem);
439
440 /*
441 * Initial parsing of the command line.
442 */
443 static void __init parse_cmdline(char **cmdline_p, char *from)
444 {
445 char c = ' ', *to = command_line;
446 int len = 0;
447
448 for (;;) {
449 if (c == ' ') {
450 extern struct early_params __early_begin, __early_end;
451 struct early_params *p;
452
453 for (p = &__early_begin; p < &__early_end; p++) {
454 int len = strlen(p->arg);
455
456 if (memcmp(from, p->arg, len) == 0) {
457 if (to != command_line)
458 to -= 1;
459 from += len;
460 p->fn(&from);
461
462 while (*from != ' ' && *from != '\0')
463 from++;
464 break;
465 }
466 }
467 }
468 c = *from++;
469 if (!c)
470 break;
471 if (COMMAND_LINE_SIZE <= ++len)
472 break;
473 *to++ = c;
474 }
475 *to = '\0';
476 *cmdline_p = command_line;
477 }
478
479 static void __init
480 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
481 {
482 #ifdef CONFIG_BLK_DEV_RAM
483 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
484
485 rd_image_start = image_start;
486 rd_prompt = prompt;
487 rd_doload = doload;
488
489 if (rd_sz)
490 rd_size = rd_sz;
491 #endif
492 }
493
494 static void __init
495 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
496 {
497 struct resource *res;
498 int i;
499
500 kernel_code.start = virt_to_phys(&_text);
501 kernel_code.end = virt_to_phys(&_etext - 1);
502 kernel_data.start = virt_to_phys(&__data_start);
503 kernel_data.end = virt_to_phys(&_end - 1);
504
505 for (i = 0; i < mi->nr_banks; i++) {
506 unsigned long virt_start, virt_end;
507
508 if (mi->bank[i].size == 0)
509 continue;
510
511 virt_start = __phys_to_virt(mi->bank[i].start);
512 virt_end = virt_start + mi->bank[i].size - 1;
513
514 res = alloc_bootmem_low(sizeof(*res));
515 res->name = "System RAM";
516 res->start = __virt_to_phys(virt_start);
517 res->end = __virt_to_phys(virt_end);
518 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
519
520 request_resource(&iomem_resource, res);
521
522 if (kernel_code.start >= res->start &&
523 kernel_code.end <= res->end)
524 request_resource(res, &kernel_code);
525 if (kernel_data.start >= res->start &&
526 kernel_data.end <= res->end)
527 request_resource(res, &kernel_data);
528 }
529
530 if (mdesc->video_start) {
531 video_ram.start = mdesc->video_start;
532 video_ram.end = mdesc->video_end;
533 request_resource(&iomem_resource, &video_ram);
534 }
535
536 /*
537 * Some machines don't have the possibility of ever
538 * possessing lp0, lp1 or lp2
539 */
540 if (mdesc->reserve_lp0)
541 request_resource(&ioport_resource, &lp0);
542 if (mdesc->reserve_lp1)
543 request_resource(&ioport_resource, &lp1);
544 if (mdesc->reserve_lp2)
545 request_resource(&ioport_resource, &lp2);
546 }
547
548 /*
549 * Tag parsing.
550 *
551 * This is the new way of passing data to the kernel at boot time. Rather
552 * than passing a fixed inflexible structure to the kernel, we pass a list
553 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
554 * tag for the list to be recognised (to distinguish the tagged list from
555 * a param_struct). The list is terminated with a zero-length tag (this tag
556 * is not parsed in any way).
557 */
558 static int __init parse_tag_core(const struct tag *tag)
559 {
560 if (tag->hdr.size > 2) {
561 if ((tag->u.core.flags & 1) == 0)
562 root_mountflags &= ~MS_RDONLY;
563 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
564 }
565 return 0;
566 }
567
568 __tagtable(ATAG_CORE, parse_tag_core);
569
570 static int __init parse_tag_mem32(const struct tag *tag)
571 {
572 if (meminfo.nr_banks >= NR_BANKS) {
573 printk(KERN_WARNING
574 "Ignoring memory bank 0x%08x size %dKB\n",
575 tag->u.mem.start, tag->u.mem.size / 1024);
576 return -EINVAL;
577 }
578 add_memory(tag->u.mem.start, tag->u.mem.size);
579 return 0;
580 }
581
582 __tagtable(ATAG_MEM, parse_tag_mem32);
583
584 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
585 struct screen_info screen_info = {
586 .orig_video_lines = 30,
587 .orig_video_cols = 80,
588 .orig_video_mode = 0,
589 .orig_video_ega_bx = 0,
590 .orig_video_isVGA = 1,
591 .orig_video_points = 8
592 };
593
594 static int __init parse_tag_videotext(const struct tag *tag)
595 {
596 screen_info.orig_x = tag->u.videotext.x;
597 screen_info.orig_y = tag->u.videotext.y;
598 screen_info.orig_video_page = tag->u.videotext.video_page;
599 screen_info.orig_video_mode = tag->u.videotext.video_mode;
600 screen_info.orig_video_cols = tag->u.videotext.video_cols;
601 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
602 screen_info.orig_video_lines = tag->u.videotext.video_lines;
603 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
604 screen_info.orig_video_points = tag->u.videotext.video_points;
605 return 0;
606 }
607
608 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
609 #endif
610
611 static int __init parse_tag_ramdisk(const struct tag *tag)
612 {
613 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
614 (tag->u.ramdisk.flags & 2) == 0,
615 tag->u.ramdisk.start, tag->u.ramdisk.size);
616 return 0;
617 }
618
619 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
620
621 static int __init parse_tag_initrd(const struct tag *tag)
622 {
623 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
624 "please update your bootloader.\n");
625 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
626 phys_initrd_size = tag->u.initrd.size;
627 return 0;
628 }
629
630 __tagtable(ATAG_INITRD, parse_tag_initrd);
631
632 static int __init parse_tag_initrd2(const struct tag *tag)
633 {
634 phys_initrd_start = tag->u.initrd.start;
635 phys_initrd_size = tag->u.initrd.size;
636 return 0;
637 }
638
639 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
640
641 static int __init parse_tag_serialnr(const struct tag *tag)
642 {
643 system_serial_low = tag->u.serialnr.low;
644 system_serial_high = tag->u.serialnr.high;
645 return 0;
646 }
647
648 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
649
650 static int __init parse_tag_revision(const struct tag *tag)
651 {
652 system_rev = tag->u.revision.rev;
653 return 0;
654 }
655
656 __tagtable(ATAG_REVISION, parse_tag_revision);
657
658 static int __init parse_tag_cmdline(const struct tag *tag)
659 {
660 strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
661 return 0;
662 }
663
664 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
665
666 /*
667 * Scan the tag table for this tag, and call its parse function.
668 * The tag table is built by the linker from all the __tagtable
669 * declarations.
670 */
671 static int __init parse_tag(const struct tag *tag)
672 {
673 extern struct tagtable __tagtable_begin, __tagtable_end;
674 struct tagtable *t;
675
676 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
677 if (tag->hdr.tag == t->tag) {
678 t->parse(tag);
679 break;
680 }
681
682 return t < &__tagtable_end;
683 }
684
685 /*
686 * Parse all tags in the list, checking both the global and architecture
687 * specific tag tables.
688 */
689 static void __init parse_tags(const struct tag *t)
690 {
691 for (; t->hdr.size; t = tag_next(t))
692 if (!parse_tag(t))
693 printk(KERN_WARNING
694 "Ignoring unrecognised tag 0x%08x\n",
695 t->hdr.tag);
696 }
697
698 /*
699 * This holds our defaults.
700 */
701 static struct init_tags {
702 struct tag_header hdr1;
703 struct tag_core core;
704 struct tag_header hdr2;
705 struct tag_mem32 mem;
706 struct tag_header hdr3;
707 } init_tags __initdata = {
708 { tag_size(tag_core), ATAG_CORE },
709 { 1, PAGE_SIZE, 0xff },
710 { tag_size(tag_mem32), ATAG_MEM },
711 { MEM_SIZE, PHYS_OFFSET },
712 { 0, ATAG_NONE }
713 };
714
715 static void (*init_machine)(void) __initdata;
716
717 static int __init customize_machine(void)
718 {
719 /* customizes platform devices, or adds new ones */
720 if (init_machine)
721 init_machine();
722 return 0;
723 }
724 arch_initcall(customize_machine);
725
726 void __init setup_arch(char **cmdline_p)
727 {
728 struct tag *tags = (struct tag *)&init_tags;
729 struct machine_desc *mdesc;
730 char *from = default_command_line;
731
732 setup_processor();
733 mdesc = setup_machine(machine_arch_type);
734 machine_name = mdesc->name;
735
736 if (mdesc->soft_reboot)
737 reboot_setup("s");
738
739 if (mdesc->boot_params)
740 tags = phys_to_virt(mdesc->boot_params);
741
742 /*
743 * If we have the old style parameters, convert them to
744 * a tag list.
745 */
746 if (tags->hdr.tag != ATAG_CORE)
747 convert_to_tag_list(tags);
748 if (tags->hdr.tag != ATAG_CORE)
749 tags = (struct tag *)&init_tags;
750
751 if (mdesc->fixup)
752 mdesc->fixup(mdesc, tags, &from, &meminfo);
753
754 if (tags->hdr.tag == ATAG_CORE) {
755 if (meminfo.nr_banks != 0)
756 squash_mem_tags(tags);
757 parse_tags(tags);
758 }
759
760 init_mm.start_code = (unsigned long) &_text;
761 init_mm.end_code = (unsigned long) &_etext;
762 init_mm.end_data = (unsigned long) &_edata;
763 init_mm.brk = (unsigned long) &_end;
764
765 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
766 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
767 parse_cmdline(cmdline_p, from);
768 paging_init(&meminfo, mdesc);
769 request_standard_resources(&meminfo, mdesc);
770
771 cpu_init();
772
773 /*
774 * Set up various architecture-specific pointers
775 */
776 init_arch_irq = mdesc->init_irq;
777 system_timer = mdesc->timer;
778 init_machine = mdesc->init_machine;
779
780 #ifdef CONFIG_VT
781 #if defined(CONFIG_VGA_CONSOLE)
782 conswitchp = &vga_con;
783 #elif defined(CONFIG_DUMMY_CONSOLE)
784 conswitchp = &dummy_con;
785 #endif
786 #endif
787 }
788
789
790 static int __init topology_init(void)
791 {
792 int cpu;
793
794 for_each_cpu(cpu)
795 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu, NULL);
796
797 return 0;
798 }
799
800 subsys_initcall(topology_init);
801
802 static const char *hwcap_str[] = {
803 "swp",
804 "half",
805 "thumb",
806 "26bit",
807 "fastmult",
808 "fpa",
809 "vfp",
810 "edsp",
811 "java",
812 NULL
813 };
814
815 static void
816 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
817 {
818 unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
819
820 seq_printf(m, "%s size\t\t: %d\n"
821 "%s assoc\t\t: %d\n"
822 "%s line length\t: %d\n"
823 "%s sets\t\t: %d\n",
824 type, mult << (8 + CACHE_SIZE(cache)),
825 type, (mult << CACHE_ASSOC(cache)) >> 1,
826 type, 8 << CACHE_LINE(cache),
827 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
828 CACHE_LINE(cache)));
829 }
830
831 static int c_show(struct seq_file *m, void *v)
832 {
833 int i;
834
835 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
836 cpu_name, (int)processor_id & 15, elf_platform);
837
838 #if defined(CONFIG_SMP)
839 for_each_online_cpu(i) {
840 /*
841 * glibc reads /proc/cpuinfo to determine the number of
842 * online processors, looking for lines beginning with
843 * "processor". Give glibc what it expects.
844 */
845 seq_printf(m, "processor\t: %d\n", i);
846 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
847 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
848 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
849 }
850 #else /* CONFIG_SMP */
851 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
852 loops_per_jiffy / (500000/HZ),
853 (loops_per_jiffy / (5000/HZ)) % 100);
854 #endif
855
856 /* dump out the processor features */
857 seq_puts(m, "Features\t: ");
858
859 for (i = 0; hwcap_str[i]; i++)
860 if (elf_hwcap & (1 << i))
861 seq_printf(m, "%s ", hwcap_str[i]);
862
863 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
864 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
865
866 if ((processor_id & 0x0000f000) == 0x00000000) {
867 /* pre-ARM7 */
868 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
869 } else {
870 if ((processor_id & 0x0000f000) == 0x00007000) {
871 /* ARM7 */
872 seq_printf(m, "CPU variant\t: 0x%02x\n",
873 (processor_id >> 16) & 127);
874 } else {
875 /* post-ARM7 */
876 seq_printf(m, "CPU variant\t: 0x%x\n",
877 (processor_id >> 20) & 15);
878 }
879 seq_printf(m, "CPU part\t: 0x%03x\n",
880 (processor_id >> 4) & 0xfff);
881 }
882 seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
883
884 {
885 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
886 if (cache_info != processor_id) {
887 seq_printf(m, "Cache type\t: %s\n"
888 "Cache clean\t: %s\n"
889 "Cache lockdown\t: %s\n"
890 "Cache format\t: %s\n",
891 cache_types[CACHE_TYPE(cache_info)],
892 cache_clean[CACHE_TYPE(cache_info)],
893 cache_lockdown[CACHE_TYPE(cache_info)],
894 CACHE_S(cache_info) ? "Harvard" : "Unified");
895
896 if (CACHE_S(cache_info)) {
897 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
898 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
899 } else {
900 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
901 }
902 }
903 }
904
905 seq_puts(m, "\n");
906
907 seq_printf(m, "Hardware\t: %s\n", machine_name);
908 seq_printf(m, "Revision\t: %04x\n", system_rev);
909 seq_printf(m, "Serial\t\t: %08x%08x\n",
910 system_serial_high, system_serial_low);
911
912 return 0;
913 }
914
915 static void *c_start(struct seq_file *m, loff_t *pos)
916 {
917 return *pos < 1 ? (void *)1 : NULL;
918 }
919
920 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
921 {
922 ++*pos;
923 return NULL;
924 }
925
926 static void c_stop(struct seq_file *m, void *v)
927 {
928 }
929
930 struct seq_operations cpuinfo_op = {
931 .start = c_start,
932 .next = c_next,
933 .stop = c_stop,
934 .show = c_show
935 };
ubuntu-bionic-kernel mirror