init.c

/*
 * OpenRISC idle.c
 *
 * Linux architectural port borrowing liberally from similar works of
 * others.  All original copyrights apply as per the original source
 * declaration.
 *
 * Modifications for the OpenRISC architecture:
 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 *
 *      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.
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/memblock.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/blkdev.h>	/* for initrd_* */
#include <linux/pagemap.h>

#include <asm/segment.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/kmap_types.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>

int mem_init_done;

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

static void __init zone_sizes_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES];

	/* Clear the zone sizes */
	memset(zones_size, 0, sizeof(zones_size));

	/*
	 * We use only ZONE_NORMAL
	 */
	zones_size[ZONE_NORMAL] = max_low_pfn;

	free_area_init(zones_size);
}

extern const char _s_kernel_ro[], _e_kernel_ro[];

/*
 * Map all physical memory into kernel's address space.
 *