1. 根目录:
2. arch
3. score
4. kernel
5. setup.c

/*
 * arch/score/kernel/setup.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/ioport.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/screen_info.h>

#include <asm-generic/sections.h>
#include <asm/setup.h>

struct screen_info screen_info;
unsigned long kernelsp;

static char command_line[COMMAND_LINE_SIZE];
static struct resource code_resource = { .name = "Kernel code",};
static struct resource data_resource = { .name = "Kernel data",};

static void __init bootmem_init(void)
{
	unsigned long start_pfn, bootmap_size;
	unsigned long size = initrd_end - initrd_start;

	start_pfn = PFN_UP(__pa(&_end));

	min_low_pfn = PFN_UP(MEMORY_START);
	max_low_pfn = PFN_UP(MEMORY_START + MEMORY_SIZE);
	max_mapnr = max_low_pfn - min_low_pfn;

	/* Initialize the boot-time allocator with low memory only. */
	bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
					 min_low_pfn, max_low_pfn);
	memblock_add_node(PFN_PHYS(min_low_pfn),
			  PFN_PHYS(max_low_pfn - min_low_pfn), 0);

	free_bootmem(PFN_PHYS(start_pfn),
		     (max_low_pfn - start_pfn) << PAGE_SHIFT);
	memory_present(0, start_pfn, max_low_pfn);

	/* Reserve space for the bootmem bitmap. */
	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);

	if (size == 0) {
		printk(KERN_INFO "Initrd not found or empty");
		goto disable;
	}

	if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
		printk(KERN_ERR "Initrd extends beyond end of memory");
		goto disable;
	}

	/* Reserve space for the initrd bitmap. */
	reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
	initrd_below_start_ok = 1;

	pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
		 initrd_start, size);
	return;
disable:
	printk(KERN_CONT " - disabling initrd\n");
	initrd_start = 0;
	initrd_end = 0;
}

static void __init resource_init(void)
{
	struct resource *res;

	code_resource.start = __pa(&_text);
	code_resource.end = __pa(&_etext) - 1;
	data_resource.start = __pa(&_etext);
	data_resource.end = __pa(&_edata) - 1;

	res = alloc_bootmem(sizeof(struct resource));
	res->name = "System RAM";
	res->start = MEMORY_START;
	res->end = MEMORY_START + MEMORY_SIZE - 1;
	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
	request_resource(&iomem_resource, res);

	request_resource(res, &code_resource);
	request_resource(res, &data_resource);
}

void __init setup_arch(char **cmdline_p)
{
	randomize_va_space = 0;
	*cmdline_p = command_line;

	cpu_cache_init();
	tlb_init();
	bootmem_init();
	paging_init();
	resource_init();
}

static int show_cpuinfo(struct seq_file *m, void *v)
{
	unsigned long n = (unsigned long) v - 1;

	seq_printf(m, "processor\t\t: %ld\n", n);
	seq_printf(m, "\n");

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	unsigned long i = *pos;

	return i < 1 ? (void *) (i + 1) : NULL;
}

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

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

const struct seq_operations cpuinfo_op = {
	.start	= c_start,
	.next	= c_next,
	.stop	= c_stop,
	.show	= show_cpuinfo,
};

static int __init topology_init(void)
{
	return 0;
}

subsys_initcall(topology_init);