2 * linux/arch/arm26/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
5 * Copyright (C) 2003 Ian Molton
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/stddef.h>
13 #include <linux/ioport.h>
14 #include <linux/delay.h>
15 #include <linux/utsname.h>
16 #include <linux/blkdev.h>
17 #include <linux/console.h>
18 #include <linux/bootmem.h>
19 #include <linux/seq_file.h>
20 #include <linux/screen_info.h>
21 #include <linux/init.h>
22 #include <linux/root_dev.h>
25 #include <asm/hardware.h>
27 #include <asm/procinfo.h>
28 #include <asm/setup.h>
29 #include <asm/mach-types.h>
30 #include <asm/tlbflush.h>
32 #include <asm/irqchip.h>
35 #define MEM_SIZE (16*1024*1024)
39 DEFINE_SPINLOCK(kernel_flag);
42 #if defined(CONFIG_FPE_NWFPE)
45 static int __init fpe_setup(char *line)
47 memcpy(fpe_type, line, 8);
51 __setup("fpe=", fpe_setup);
54 extern void paging_init(struct meminfo *);
55 extern void convert_to_tag_list(struct tag *tags);
56 extern void squash_mem_tags(struct tag *tag);
57 extern void bootmem_init(struct meminfo *);
58 extern int root_mountflags;
59 extern int _stext, _text, _etext, _edata, _end;
60 #ifdef CONFIG_XIP_KERNEL
61 extern int _endtext, _sdata;
65 unsigned int processor_id;
66 unsigned int __machine_arch_type;
67 unsigned int system_rev;
68 unsigned int system_serial_low;
69 unsigned int system_serial_high;
70 unsigned int elf_hwcap;
71 unsigned int memc_ctrl_reg;
72 unsigned int number_mfm_drives;
74 struct processor processor;
76 char elf_platform[ELF_PLATFORM_SIZE];
78 unsigned long phys_initrd_start __initdata = 0;
79 unsigned long phys_initrd_size __initdata = 0;
80 static struct meminfo meminfo __initdata = { 0, };
81 static struct proc_info_item proc_info;
82 static const char *machine_name;
83 static char command_line[COMMAND_LINE_SIZE];
85 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
88 * Standard memory resources
90 static struct resource mem_res[] = {
91 { "Video RAM", 0, 0, IORESOURCE_MEM },
92 { "Kernel code", 0, 0, IORESOURCE_MEM },
93 { "Kernel data", 0, 0, IORESOURCE_MEM }
96 #define video_ram mem_res[0]
97 #define kernel_code mem_res[1]
98 #define kernel_data mem_res[2]
100 static struct resource io_res[] = {
101 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
102 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
103 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
106 #define lp0 io_res[0]
107 #define lp1 io_res[1]
108 #define lp2 io_res[2]
110 #define dump_cpu_info() do { } while (0)
112 static void __init setup_processor(void)
114 extern struct proc_info_list __proc_info_begin, __proc_info_end;
115 struct proc_info_list *list;
118 * locate processor in the list of supported processor
119 * types. The linker builds this table for us from the
120 * entries in arch/arm26/mm/proc-*.S
122 for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
123 if ((processor_id & list->cpu_mask) == list->cpu_val)
127 * If processor type is unrecognised, then we
130 if (list >= &__proc_info_end) {
131 printk("CPU configuration botched (ID %08x), unable "
132 "to continue.\n", processor_id);
136 proc_info = *list->info;
137 processor = *list->proc;
140 printk("CPU: %s %s revision %d\n",
141 proc_info.manufacturer, proc_info.cpu_name,
142 (int)processor_id & 15);
146 sprintf(init_utsname()->machine, "%s", list->arch_name);
147 sprintf(elf_platform, "%s", list->elf_name);
148 elf_hwcap = list->elf_hwcap;
154 * Initial parsing of the command line. We need to pick out the
155 * memory size. We look for mem=size@start, where start and size
159 parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
161 char c = ' ', *to = command_line;
162 int usermem = 0, len = 0;
165 if (c == ' ' && !memcmp(from, "mem=", 4)) {
166 unsigned long size, start;
168 if (to != command_line)
172 * If the user specifies memory size, we
173 * blow away any automatically generated
182 size = memparse(from + 4, &from);
184 start = memparse(from + 1, &from);
186 mi->bank[mi->nr_banks].start = start;
187 mi->bank[mi->nr_banks].size = size;
188 mi->bank[mi->nr_banks].node = PHYS_TO_NID(start);
194 if (COMMAND_LINE_SIZE <= ++len)
199 *cmdline_p = command_line;
203 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
205 #ifdef CONFIG_BLK_DEV_RAM
206 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
208 rd_image_start = image_start;
218 request_standard_resources(struct meminfo *mi)
220 struct resource *res;
223 kernel_code.start = init_mm.start_code;
224 kernel_code.end = init_mm.end_code - 1;
225 #ifdef CONFIG_XIP_KERNEL
226 kernel_data.start = init_mm.start_data;
228 kernel_data.start = init_mm.end_code;
230 kernel_data.end = init_mm.brk - 1;
232 for (i = 0; i < mi->nr_banks; i++) {
233 unsigned long virt_start, virt_end;
235 if (mi->bank[i].size == 0)
238 virt_start = mi->bank[i].start;
239 virt_end = virt_start + mi->bank[i].size - 1;
241 res = alloc_bootmem_low(sizeof(*res));
242 res->name = "System RAM";
243 res->start = virt_start;
245 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
247 request_resource(&iomem_resource, res);
249 if (kernel_code.start >= res->start &&
250 kernel_code.end <= res->end)
251 request_resource(res, &kernel_code);
252 if (kernel_data.start >= res->start &&
253 kernel_data.end <= res->end)
254 request_resource(res, &kernel_data);
257 /* FIXME - needed? if (mdesc->video_start) {
258 video_ram.start = mdesc->video_start;
259 video_ram.end = mdesc->video_end;
260 request_resource(&iomem_resource, &video_ram);
264 * Some machines don't have the possibility of ever
265 * possessing lp1 or lp2
267 if (0) /* FIXME - need to do this for A5k at least */
268 request_resource(&ioport_resource, &lp0);
274 * This is the new way of passing data to the kernel at boot time. Rather
275 * than passing a fixed inflexible structure to the kernel, we pass a list
276 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
277 * tag for the list to be recognised (to distinguish the tagged list from
278 * a param_struct). The list is terminated with a zero-length tag (this tag
279 * is not parsed in any way).
281 static int __init parse_tag_core(const struct tag *tag)
283 if (tag->hdr.size > 2) {
284 if ((tag->u.core.flags & 1) == 0)
285 root_mountflags &= ~MS_RDONLY;
286 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
291 __tagtable(ATAG_CORE, parse_tag_core);
293 static int __init parse_tag_mem32(const struct tag *tag)
295 if (meminfo.nr_banks >= NR_BANKS) {
297 "Ignoring memory bank 0x%08x size %dKB\n",
298 tag->u.mem.start, tag->u.mem.size / 1024);
301 meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
302 meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
303 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
304 meminfo.nr_banks += 1;
309 __tagtable(ATAG_MEM, parse_tag_mem32);
311 #if defined(CONFIG_DUMMY_CONSOLE)
312 struct screen_info screen_info = {
313 .orig_video_lines = 30,
314 .orig_video_cols = 80,
315 .orig_video_mode = 0,
316 .orig_video_ega_bx = 0,
317 .orig_video_isVGA = 1,
318 .orig_video_points = 8
321 static int __init parse_tag_videotext(const struct tag *tag)
323 screen_info.orig_x = tag->u.videotext.x;
324 screen_info.orig_y = tag->u.videotext.y;
325 screen_info.orig_video_page = tag->u.videotext.video_page;
326 screen_info.orig_video_mode = tag->u.videotext.video_mode;
327 screen_info.orig_video_cols = tag->u.videotext.video_cols;
328 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
329 screen_info.orig_video_lines = tag->u.videotext.video_lines;
330 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
331 screen_info.orig_video_points = tag->u.videotext.video_points;
335 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
338 static int __init parse_tag_acorn(const struct tag *tag)
340 memc_ctrl_reg = tag->u.acorn.memc_control_reg;
341 number_mfm_drives = tag->u.acorn.adfsdrives;
345 __tagtable(ATAG_ACORN, parse_tag_acorn);
347 static int __init parse_tag_ramdisk(const struct tag *tag)
349 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
350 (tag->u.ramdisk.flags & 2) == 0,
351 tag->u.ramdisk.start, tag->u.ramdisk.size);
355 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
357 static int __init parse_tag_initrd(const struct tag *tag)
359 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
360 phys_initrd_start = (unsigned long)tag->u.initrd.start;
361 phys_initrd_size = (unsigned long)tag->u.initrd.size;
365 __tagtable(ATAG_INITRD, parse_tag_initrd);
367 static int __init parse_tag_initrd2(const struct tag *tag)
369 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
370 phys_initrd_start = (unsigned long)tag->u.initrd.start;
371 phys_initrd_size = (unsigned long)tag->u.initrd.size;
375 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
377 static int __init parse_tag_serialnr(const struct tag *tag)
379 system_serial_low = tag->u.serialnr.low;
380 system_serial_high = tag->u.serialnr.high;
384 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
386 static int __init parse_tag_revision(const struct tag *tag)
388 system_rev = tag->u.revision.rev;
392 __tagtable(ATAG_REVISION, parse_tag_revision);
394 static int __init parse_tag_cmdline(const struct tag *tag)
396 strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
397 default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
401 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
404 * Scan the tag table for this tag, and call its parse function.
405 * The tag table is built by the linker from all the __tagtable
408 static int __init parse_tag(const struct tag *tag)
410 extern struct tagtable __tagtable_begin, __tagtable_end;
413 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
414 if (tag->hdr.tag == t->tag) {
419 return t < &__tagtable_end;
423 * Parse all tags in the list, checking both the global and architecture
424 * specific tag tables.
426 static void __init parse_tags(const struct tag *t)
428 for (; t->hdr.size; t = tag_next(t))
431 "Ignoring unrecognised tag 0x%08x\n",
436 * This holds our defaults.
438 static struct init_tags {
439 struct tag_header hdr1;
440 struct tag_core core;
441 struct tag_header hdr2;
442 struct tag_mem32 mem;
443 struct tag_header hdr3;
444 } init_tags __initdata = {
445 { tag_size(tag_core), ATAG_CORE },
446 { 1, PAGE_SIZE, 0xff },
447 { tag_size(tag_mem32), ATAG_MEM },
448 { MEM_SIZE, PHYS_OFFSET },
452 void __init setup_arch(char **cmdline_p)
454 struct tag *tags = (struct tag *)&init_tags;
455 char *from = default_command_line;
458 if(machine_arch_type == MACH_TYPE_A5K)
459 machine_name = "A5000";
460 else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
461 machine_name = "Archimedes";
463 machine_name = "UNKNOWN";
465 //FIXME - the tag struct is always copied here but this is a block
466 // of RAM that is accidentally reserved along with video RAM. perhaps
467 // it would be a good idea to explicitly reserve this?
469 tags = (struct tag *)0x0207c000;
472 * If we have the old style parameters, convert them to
475 if (tags->hdr.tag != ATAG_CORE)
476 convert_to_tag_list(tags);
477 if (tags->hdr.tag != ATAG_CORE)
478 tags = (struct tag *)&init_tags;
479 if (tags->hdr.tag == ATAG_CORE) {
480 if (meminfo.nr_banks != 0)
481 squash_mem_tags(tags);
485 init_mm.start_code = (unsigned long) &_text;
486 #ifndef CONFIG_XIP_KERNEL
487 init_mm.end_code = (unsigned long) &_etext;
489 init_mm.end_code = (unsigned long) &_endtext;
490 init_mm.start_data = (unsigned long) &_sdata;
492 init_mm.end_data = (unsigned long) &_edata;
493 init_mm.brk = (unsigned long) &_end;
495 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
496 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
497 parse_cmdline(&meminfo, cmdline_p, from);
498 bootmem_init(&meminfo);
499 paging_init(&meminfo);
500 request_standard_resources(&meminfo);
503 #if defined(CONFIG_DUMMY_CONSOLE)
504 conswitchp = &dummy_con;
509 static const char *hwcap_str[] = {
521 static int c_show(struct seq_file *m, void *v)
525 seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
526 proc_info.manufacturer, proc_info.cpu_name,
527 (int)processor_id & 15, elf_platform);
529 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
530 loops_per_jiffy / (500000/HZ),
531 (loops_per_jiffy / (5000/HZ)) % 100);
533 /* dump out the processor features */
534 seq_puts(m, "Features\t: ");
536 for (i = 0; hwcap_str[i]; i++)
537 if (elf_hwcap & (1 << i))
538 seq_printf(m, "%s ", hwcap_str[i]);
542 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
543 seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
544 seq_printf(m, "Hardware\t: %s\n", machine_name);
545 seq_printf(m, "Revision\t: %04x\n", system_rev);
546 seq_printf(m, "Serial\t\t: %08x%08x\n",
547 system_serial_high, system_serial_low);
552 static void *c_start(struct seq_file *m, loff_t *pos)
554 return *pos < 1 ? (void *)1 : NULL;
557 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
563 static void c_stop(struct seq_file *m, void *v)
567 struct seq_operations cpuinfo_op = {