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/config.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/blkdev.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>
26 #include <asm/hardware.h>
28 #include <asm/procinfo.h>
29 #include <asm/setup.h>
30 #include <asm/mach-types.h>
31 #include <asm/tlbflush.h>
33 #include <asm/irqchip.h>
36 #define MEM_SIZE (16*1024*1024)
40 DEFINE_SPINLOCK(kernel_flag);
43 #if defined(CONFIG_FPE_NWFPE)
46 static int __init fpe_setup(char *line)
48 memcpy(fpe_type, line, 8);
52 __setup("fpe=", fpe_setup);
55 extern void paging_init(struct meminfo *);
56 extern void convert_to_tag_list(struct tag *tags);
57 extern void squash_mem_tags(struct tag *tag);
58 extern void bootmem_init(struct meminfo *);
59 extern int root_mountflags;
60 extern int _stext, _text, _etext, _edata, _end;
61 #ifdef CONFIG_XIP_KERNEL
62 extern int _endtext, _sdata;
66 unsigned int processor_id;
67 unsigned int __machine_arch_type;
68 unsigned int system_rev;
69 unsigned int system_serial_low;
70 unsigned int system_serial_high;
71 unsigned int elf_hwcap;
72 unsigned int memc_ctrl_reg;
73 unsigned int number_mfm_drives;
75 struct processor processor;
77 char elf_platform[ELF_PLATFORM_SIZE];
79 unsigned long phys_initrd_start __initdata = 0;
80 unsigned long phys_initrd_size __initdata = 0;
81 static struct meminfo meminfo __initdata = { 0, };
82 static struct proc_info_item proc_info;
83 static const char *machine_name;
84 static char command_line[COMMAND_LINE_SIZE];
86 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
89 * Standard memory resources
91 static struct resource mem_res[] = {
92 { "Video RAM", 0, 0, IORESOURCE_MEM },
93 { "Kernel code", 0, 0, IORESOURCE_MEM },
94 { "Kernel data", 0, 0, IORESOURCE_MEM }
97 #define video_ram mem_res[0]
98 #define kernel_code mem_res[1]
99 #define kernel_data mem_res[2]
101 static struct resource io_res[] = {
102 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY },
103 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY },
104 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY }
107 #define lp0 io_res[0]
108 #define lp1 io_res[1]
109 #define lp2 io_res[2]
111 #define dump_cpu_info() do { } while (0)
113 static void __init setup_processor(void)
115 extern struct proc_info_list __proc_info_begin, __proc_info_end;
116 struct proc_info_list *list;
119 * locate processor in the list of supported processor
120 * types. The linker builds this table for us from the
121 * entries in arch/arm26/mm/proc-*.S
123 for (list = &__proc_info_begin; list < &__proc_info_end ; list++)
124 if ((processor_id & list->cpu_mask) == list->cpu_val)
128 * If processor type is unrecognised, then we
131 if (list >= &__proc_info_end) {
132 printk("CPU configuration botched (ID %08x), unable "
133 "to continue.\n", processor_id);
137 proc_info = *list->info;
138 processor = *list->proc;
141 printk("CPU: %s %s revision %d\n",
142 proc_info.manufacturer, proc_info.cpu_name,
143 (int)processor_id & 15);
147 sprintf(system_utsname.machine, "%s", list->arch_name);
148 sprintf(elf_platform, "%s", list->elf_name);
149 elf_hwcap = list->elf_hwcap;
155 * Initial parsing of the command line. We need to pick out the
156 * memory size. We look for mem=size@start, where start and size
160 parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from)
162 char c = ' ', *to = command_line;
163 int usermem = 0, len = 0;
166 if (c == ' ' && !memcmp(from, "mem=", 4)) {
167 unsigned long size, start;
169 if (to != command_line)
173 * If the user specifies memory size, we
174 * blow away any automatically generated
183 size = memparse(from + 4, &from);
185 start = memparse(from + 1, &from);
187 mi->bank[mi->nr_banks].start = start;
188 mi->bank[mi->nr_banks].size = size;
189 mi->bank[mi->nr_banks].node = PHYS_TO_NID(start);
195 if (COMMAND_LINE_SIZE <= ++len)
200 *cmdline_p = command_line;
204 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
206 #ifdef CONFIG_BLK_DEV_RAM
207 extern int rd_size, rd_image_start, rd_prompt, rd_doload;
209 rd_image_start = image_start;
219 request_standard_resources(struct meminfo *mi)
221 struct resource *res;
224 kernel_code.start = init_mm.start_code;
225 kernel_code.end = init_mm.end_code - 1;
226 #ifdef CONFIG_XIP_KERNEL
227 kernel_data.start = init_mm.start_data;
229 kernel_data.start = init_mm.end_code;
231 kernel_data.end = init_mm.brk - 1;
233 for (i = 0; i < mi->nr_banks; i++) {
234 unsigned long virt_start, virt_end;
236 if (mi->bank[i].size == 0)
239 virt_start = mi->bank[i].start;
240 virt_end = virt_start + mi->bank[i].size - 1;
242 res = alloc_bootmem_low(sizeof(*res));
243 res->name = "System RAM";
244 res->start = virt_start;
246 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
248 request_resource(&iomem_resource, res);
250 if (kernel_code.start >= res->start &&
251 kernel_code.end <= res->end)
252 request_resource(res, &kernel_code);
253 if (kernel_data.start >= res->start &&
254 kernel_data.end <= res->end)
255 request_resource(res, &kernel_data);
258 /* FIXME - needed? if (mdesc->video_start) {
259 video_ram.start = mdesc->video_start;
260 video_ram.end = mdesc->video_end;
261 request_resource(&iomem_resource, &video_ram);
265 * Some machines don't have the possibility of ever
266 * possessing lp1 or lp2
268 if (0) /* FIXME - need to do this for A5k at least */
269 request_resource(&ioport_resource, &lp0);
275 * This is the new way of passing data to the kernel at boot time. Rather
276 * than passing a fixed inflexible structure to the kernel, we pass a list
277 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE
278 * tag for the list to be recognised (to distinguish the tagged list from
279 * a param_struct). The list is terminated with a zero-length tag (this tag
280 * is not parsed in any way).
282 static int __init parse_tag_core(const struct tag *tag)
284 if (tag->hdr.size > 2) {
285 if ((tag->u.core.flags & 1) == 0)
286 root_mountflags &= ~MS_RDONLY;
287 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
292 __tagtable(ATAG_CORE, parse_tag_core);
294 static int __init parse_tag_mem32(const struct tag *tag)
296 if (meminfo.nr_banks >= NR_BANKS) {
298 "Ignoring memory bank 0x%08x size %dKB\n",
299 tag->u.mem.start, tag->u.mem.size / 1024);
302 meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
303 meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
304 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
305 meminfo.nr_banks += 1;
310 __tagtable(ATAG_MEM, parse_tag_mem32);
312 #if defined(CONFIG_DUMMY_CONSOLE)
313 struct screen_info screen_info = {
314 .orig_video_lines = 30,
315 .orig_video_cols = 80,
316 .orig_video_mode = 0,
317 .orig_video_ega_bx = 0,
318 .orig_video_isVGA = 1,
319 .orig_video_points = 8
322 static int __init parse_tag_videotext(const struct tag *tag)
324 screen_info.orig_x = tag->u.videotext.x;
325 screen_info.orig_y = tag->u.videotext.y;
326 screen_info.orig_video_page = tag->u.videotext.video_page;
327 screen_info.orig_video_mode = tag->u.videotext.video_mode;
328 screen_info.orig_video_cols = tag->u.videotext.video_cols;
329 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
330 screen_info.orig_video_lines = tag->u.videotext.video_lines;
331 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga;
332 screen_info.orig_video_points = tag->u.videotext.video_points;
336 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
339 static int __init parse_tag_acorn(const struct tag *tag)
341 memc_ctrl_reg = tag->u.acorn.memc_control_reg;
342 number_mfm_drives = tag->u.acorn.adfsdrives;
346 __tagtable(ATAG_ACORN, parse_tag_acorn);
348 static int __init parse_tag_ramdisk(const struct tag *tag)
350 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
351 (tag->u.ramdisk.flags & 2) == 0,
352 tag->u.ramdisk.start, tag->u.ramdisk.size);
356 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
358 static int __init parse_tag_initrd(const struct tag *tag)
360 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
361 phys_initrd_start = (unsigned long)tag->u.initrd.start;
362 phys_initrd_size = (unsigned long)tag->u.initrd.size;
366 __tagtable(ATAG_INITRD, parse_tag_initrd);
368 static int __init parse_tag_initrd2(const struct tag *tag)
370 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n");
371 phys_initrd_start = (unsigned long)tag->u.initrd.start;
372 phys_initrd_size = (unsigned long)tag->u.initrd.size;
376 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
378 static int __init parse_tag_serialnr(const struct tag *tag)
380 system_serial_low = tag->u.serialnr.low;
381 system_serial_high = tag->u.serialnr.high;
385 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
387 static int __init parse_tag_revision(const struct tag *tag)
389 system_rev = tag->u.revision.rev;
393 __tagtable(ATAG_REVISION, parse_tag_revision);
395 static int __init parse_tag_cmdline(const struct tag *tag)
397 strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
398 default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
402 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
405 * Scan the tag table for this tag, and call its parse function.
406 * The tag table is built by the linker from all the __tagtable
409 static int __init parse_tag(const struct tag *tag)
411 extern struct tagtable __tagtable_begin, __tagtable_end;
414 for (t = &__tagtable_begin; t < &__tagtable_end; t++)
415 if (tag->hdr.tag == t->tag) {
420 return t < &__tagtable_end;
424 * Parse all tags in the list, checking both the global and architecture
425 * specific tag tables.
427 static void __init parse_tags(const struct tag *t)
429 for (; t->hdr.size; t = tag_next(t))
432 "Ignoring unrecognised tag 0x%08x\n",
437 * This holds our defaults.
439 static struct init_tags {
440 struct tag_header hdr1;
441 struct tag_core core;
442 struct tag_header hdr2;
443 struct tag_mem32 mem;
444 struct tag_header hdr3;
445 } init_tags __initdata = {
446 { tag_size(tag_core), ATAG_CORE },
447 { 1, PAGE_SIZE, 0xff },
448 { tag_size(tag_mem32), ATAG_MEM },
449 { MEM_SIZE, PHYS_OFFSET },
453 void __init setup_arch(char **cmdline_p)
455 struct tag *tags = (struct tag *)&init_tags;
456 char *from = default_command_line;
459 if(machine_arch_type == MACH_TYPE_A5K)
460 machine_name = "A5000";
461 else if(machine_arch_type == MACH_TYPE_ARCHIMEDES)
462 machine_name = "Archimedes";
464 machine_name = "UNKNOWN";
466 //FIXME - the tag struct is always copied here but this is a block
467 // of RAM that is accidentally reserved along with video RAM. perhaps
468 // it would be a good idea to explicitly reserve this?
470 tags = (struct tag *)0x0207c000;
473 * If we have the old style parameters, convert them to
476 if (tags->hdr.tag != ATAG_CORE)
477 convert_to_tag_list(tags);
478 if (tags->hdr.tag != ATAG_CORE)
479 tags = (struct tag *)&init_tags;
480 if (tags->hdr.tag == ATAG_CORE) {
481 if (meminfo.nr_banks != 0)
482 squash_mem_tags(tags);
486 init_mm.start_code = (unsigned long) &_text;
487 #ifndef CONFIG_XIP_KERNEL
488 init_mm.end_code = (unsigned long) &_etext;
490 init_mm.end_code = (unsigned long) &_endtext;
491 init_mm.start_data = (unsigned long) &_sdata;
493 init_mm.end_data = (unsigned long) &_edata;
494 init_mm.brk = (unsigned long) &_end;
496 memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
497 saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
498 parse_cmdline(&meminfo, cmdline_p, from);
499 bootmem_init(&meminfo);
500 paging_init(&meminfo);
501 request_standard_resources(&meminfo);
504 #if defined(CONFIG_DUMMY_CONSOLE)
505 conswitchp = &dummy_con;
510 static const char *hwcap_str[] = {
522 static int c_show(struct seq_file *m, void *v)
526 seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
527 proc_info.manufacturer, proc_info.cpu_name,
528 (int)processor_id & 15, elf_platform);
530 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
531 loops_per_jiffy / (500000/HZ),
532 (loops_per_jiffy / (5000/HZ)) % 100);
534 /* dump out the processor features */
535 seq_puts(m, "Features\t: ");
537 for (i = 0; hwcap_str[i]; i++)
538 if (elf_hwcap & (1 << i))
539 seq_printf(m, "%s ", hwcap_str[i]);
543 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
544 seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15);
545 seq_printf(m, "Hardware\t: %s\n", machine_name);
546 seq_printf(m, "Revision\t: %04x\n", system_rev);
547 seq_printf(m, "Serial\t\t: %08x%08x\n",
548 system_serial_high, system_serial_low);
553 static void *c_start(struct seq_file *m, loff_t *pos)
555 return *pos < 1 ? (void *)1 : NULL;
558 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
564 static void c_stop(struct seq_file *m, void *v)
568 struct seq_operations cpuinfo_op = {