setup.c

上传linux-jx2410的源代码

	}

	/*
	 * Some machines don't have the possibility of ever
	 * possessing lp0, lp1 or lp2
	 */
	if (mdesc->reserve_lp0)
		request_resource(&ioport_resource, &lp0);
	if (mdesc->reserve_lp1)
		request_resource(&ioport_resource, &lp1);
	if (mdesc->reserve_lp2)
		request_resource(&ioport_resource, &lp2);
}

/*
 *  Tag parsing.
 *
 * This is the new way of passing data to the kernel at boot time.  Rather
 * than passing a fixed inflexible structure to the kernel, we pass a list
 * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 * tag for the list to be recognised (to distinguish the tagged list from
 * a param_struct).  The list is terminated with a zero-length tag (this tag
 * is not parsed in any way).
 */
static int __init parse_tag_core(const struct tag *tag)
{
	if (tag->hdr.size > 2) {
		if ((tag->u.core.flags & 1) == 0)
			root_mountflags &= ~MS_RDONLY;
		ROOT_DEV = to_kdev_t(tag->u.core.rootdev);
	}
	return 0;
}

__tagtable(ATAG_CORE, parse_tag_core);

static int __init parse_tag_mem32(const struct tag *tag)
{
	if (meminfo.nr_banks >= NR_BANKS) {
		printk(KERN_WARNING
		       "Ignoring memory bank 0x%08x size %dKB\n",
			tag->u.mem.start, tag->u.mem.size / 1024);
		return -EINVAL;
	}
	meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
	meminfo.bank[meminfo.nr_banks].size  = tag->u.mem.size;
	meminfo.bank[meminfo.nr_banks].node  = PHYS_TO_NID(tag->u.mem.start);
	meminfo.nr_banks += 1;

	return 0;
}

__tagtable(ATAG_MEM, parse_tag_mem32);

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
struct screen_info screen_info = {
 orig_video_lines:	30,
 orig_video_cols:	80,
 orig_video_mode:	0,
 orig_video_ega_bx:	0,
 orig_video_isVGA:	1,
 orig_video_points:	8
};

static int __init parse_tag_videotext(const struct tag *tag)
{
	screen_info.orig_x            = tag->u.videotext.x;
	screen_info.orig_y            = tag->u.videotext.y;
	screen_info.orig_video_page   = tag->u.videotext.video_page;
	screen_info.orig_video_mode   = tag->u.videotext.video_mode;
	screen_info.orig_video_cols   = tag->u.videotext.video_cols;
	screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
	screen_info.orig_video_lines  = tag->u.videotext.video_lines;
	screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
	screen_info.orig_video_points = tag->u.videotext.video_points;
	return 0;
}

__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
#endif

static int __init parse_tag_ramdisk(const struct tag *tag)
{
	setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
		      (tag->u.ramdisk.flags & 2) == 0,
		      tag->u.ramdisk.start, tag->u.ramdisk.size);
	return 0;
}

__tagtable(ATAG_RAMDISK, parse_tag_ramdisk);

static int __init parse_tag_initrd(const struct tag *tag)
{
	setup_initrd(tag->u.initrd.start, tag->u.initrd.size);
	return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
	unsigned long start = 0;

	if (tag->u.initrd.size) {
		start = (unsigned long)phys_to_virt(tag->u.initrd.start);

		setup_initrd(start, tag->u.initrd.size);
	}
	return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

static int __init parse_tag_serialnr(const struct tag *tag)
{
	system_serial_low = tag->u.serialnr.low;
	system_serial_high = tag->u.serialnr.high;
	return 0;
}

__tagtable(ATAG_SERIAL, parse_tag_serialnr);

static int __init parse_tag_revision(const struct tag *tag)
{
	system_rev = tag->u.revision.rev;
	return 0;
}

__tagtable(ATAG_REVISION, parse_tag_revision);

static int __init parse_tag_cmdline(const struct tag *tag)
{
#ifndef CONFIG_NO_TAG_CMDLINE
	strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
#endif
	default_command_line[COMMAND_LINE_SIZE - 1] = '\0';
	return 0;
}

__tagtable(ATAG_CMDLINE, parse_tag_cmdline);

/*
 * Scan the tag table for this tag, and call its parse function.
 * The tag table is built by the linker from all the __tagtable
 * declarations.
 */
static int __init parse_tag(const struct tag *tag)
{
	extern struct tagtable __tagtable_begin, __tagtable_end;
	struct tagtable *t;

	for (t = &__tagtable_begin; t < &__tagtable_end; t++)
		if (tag->hdr.tag == t->tag) {
			t->parse(tag);
			break;
		}

	return t < &__tagtable_end;
}

/*
 * Parse all tags in the list, checking both the global and architecture
 * specific tag tables.
 */
static void __init parse_tags(const struct tag *t)
{
	for (; t->hdr.size; t = tag_next(t))
		if (!parse_tag(t))
			printk(KERN_WARNING
				"Ignoring unrecognised tag 0x%08x\n",
				t->hdr.tag);
}

void __init setup_arch(char **cmdline_p)
{
	struct tag *tags = NULL;
	struct machine_desc *mdesc;
	char *from = default_command_line;

	ROOT_DEV = MKDEV(0, 255);

	setup_processor();
	mdesc = setup_machine(machine_arch_type);
	machine_name = mdesc->name;

	if (mdesc->soft_reboot)
		reboot_setup("s");

	if (mdesc->param_offset)
		tags = phys_to_virt(mdesc->param_offset);

	/*
	 * Do the machine-specific fixups before we parse the
	 * parameters or tags.
	 */
	if (mdesc->fixup)
		mdesc->fixup(mdesc, (struct param_struct *)tags,
			     &from, &meminfo);

	/*
	 * If we have the old style parameters, convert them to
	 * a tag list before.
	 */
	if (tags && tags->hdr.tag != ATAG_CORE)
		convert_to_tag_list((struct param_struct *)tags,
				    meminfo.nr_banks == 0);

	if (tags && tags->hdr.tag == ATAG_CORE)
		parse_tags(tags);

	if (meminfo.nr_banks == 0) {
		meminfo.nr_banks      = 1;
		meminfo.bank[0].start = PHYS_OFFSET;
		meminfo.bank[0].size  = MEM_SIZE;
	}

	init_mm.start_code = (unsigned long) &_text;
	init_mm.end_code   = (unsigned long) &_etext;
	init_mm.end_data   = (unsigned long) &_edata;
	init_mm.brk	   = (unsigned long) &_end;

	memcpy(saved_command_line, from, COMMAND_LINE_SIZE);
	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
	parse_cmdline(&meminfo, cmdline_p, from);
	bootmem_init(&meminfo);
	paging_init(&meminfo, mdesc);
	request_standard_resources(&meminfo, mdesc);

	/*
	 * Set up various architecture-specific pointers
	 */
	init_arch_irq = mdesc->init_irq;

#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
	conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
#endif
}

static const char *hwcap_str[] = {
	"swp",
	"half",
	"thumb",
	"26bit",
	"fastmult",
	"fpa",
	"vfp",
	"edsp",
	NULL
};

static const char *proc_arch[16] = {
	"undefined 0",
	"4",
	"4T",
	"5",
	"5T",
	"5TE",
	"undefined 6",
	"undefined 7",
	"undefined 8",
	"undefined 9",
	"undefined 10",
	"undefined 11",
	"undefined 12",
	"undefined 13",
	"undefined 14",
	"undefined 15"
};

static void
c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
{
	unsigned int mult = 2 + CACHE_M(cache) ? 1 : 0;

	seq_printf(m, "%s size\t\t: %d\n"
		      "%s assoc\t\t: %d\n"
		      "%s line length\t: %d\n"
		      "%s sets\t\t: %d\n",
		type, mult << (8 + CACHE_SIZE(cache)),
		type, (mult << CACHE_ASSOC(cache)) >> 1,
		type, 8 << CACHE_LINE(cache),
		type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
			    CACHE_LINE(cache)));
}

static int c_show(struct seq_file *m, void *v)
{
	int i;

	seq_printf(m, "Processor\t: %s %s rev %d (%s)\n",
		   proc_info.manufacturer, proc_info.cpu_name,
		   (int)processor_id & 15, elf_platform);

	seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
		   loops_per_jiffy / (500000/HZ),
		   (loops_per_jiffy / (5000/HZ)) % 100);

	/* dump out the processor features */
	seq_puts(m, "Features\t: ");

	for (i = 0; hwcap_str[i]; i++)
		if (elf_hwcap & (1 << i))
			seq_printf(m, "%s ", hwcap_str[i]);

	seq_puts(m, "\n");

	if ((processor_id & 0x0000f000) == 0x00000000) {
		/* pre-ARM7 */
		seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
	} else if ((processor_id & 0x0000f000) == 0x00007000) {
		/* ARM7 */
		seq_printf(m, "CPU implementor\t: 0x%02x\n"
			      "CPU architecture: %s\n"
			      "CPU variant\t: 0x%02x\n"
			      "CPU part\t: 0x%03x\n",
			   processor_id >> 24,
			   processor_id & (1 << 23) ? "4T" : "3",
			   (processor_id >> 16) & 127,
			   (processor_id >> 4) & 0xfff);
	} else {
		/* post-ARM7 */
		seq_printf(m, "CPU implementor\t: 0x%02x\n"
			      "CPU architecture: %s\n"
			      "CPU variant\t: 0x%x\n"
			      "CPU part\t: 0x%03x\n",
			   processor_id >> 24,
			   proc_arch[(processor_id >> 16) & 15],
			   (processor_id >> 20) & 15,
			   (processor_id >> 4) & 0xfff);
	}
	seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);

#ifdef CONFIG_CPU_32
	{
		unsigned int cache_info;

		asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (cache_info));
		if (cache_info != processor_id) {
			seq_printf(m, "Cache type\t: %s\n"
				      "Cache clean\t: %s\n"
				      "Cache lockdown\t: %s\n"
				      "Cache unified\t: %s\n",
				   cache_types[CACHE_TYPE(cache_info)],
				   cache_clean[CACHE_TYPE(cache_info)],
				   cache_lockdown[CACHE_TYPE(cache_info)],
				   CACHE_S(cache_info) ? "harvard" : "unified");

			if (CACHE_S(cache_info)) {
				c_show_cache(m, "I", CACHE_ISIZE(cache_info));
				c_show_cache(m, "D", CACHE_DSIZE(cache_info));
			} else {
				c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
			}
		}
	}
#endif

	seq_puts(m, "\n");

	seq_printf(m, "Hardware\t: %s\n", machine_name);
	seq_printf(m, "Revision\t: %04x\n", system_rev);
	seq_printf(m, "Serial\t\t: %08x%08x\n",
		   system_serial_high, system_serial_low);

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < 1 ? (void *)1 : NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	start:	c_start,
	next:	c_next,
	stop:	c_stop,
	show:	c_show
};