1/*
  2 * arch/score/mm/init.c
  3 *
  4 * Score Processor version.
  5 *
  6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
  7 *  Lennox Wu <lennox.wu@sunplusct.com>
  8 *  Chen Liqin <liqin.chen@sunplusct.com>
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License as published by
 12 * the Free Software Foundation; either version 2 of the License, or
 13 * (at your option) any later version.
 14 *
 15 * This program is distributed in the hope that it will be useful,
 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18 * GNU General Public License for more details.
 19 *
 20 * You should have received a copy of the GNU General Public License
 21 * along with this program; if not, see the file COPYING, or write
 22 * to the Free Software Foundation, Inc.,
 23 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 24 */
 25
 26#include <linux/errno.h>
 27#include <linux/bootmem.h>
 28#include <linux/kernel.h>
 29#include <linux/gfp.h>
 30#include <linux/init.h>
 31#include <linux/mm.h>
 32#include <linux/mman.h>
 33#include <linux/pagemap.h>
 34#include <linux/kcore.h>
 35#include <linux/sched.h>
 36#include <linux/initrd.h>
 37
 38#include <asm/sections.h>
 39#include <asm/tlb.h>
 40
 41unsigned long empty_zero_page;
 42EXPORT_SYMBOL_GPL(empty_zero_page);
 43
 44static void setup_zero_page(void)
 45{
 46	struct page *page;
 47
 48	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
 49	if (!empty_zero_page)
 50		panic("Oh boy, that early out of memory?");
 51
 52	page = virt_to_page((void *) empty_zero_page);
 53	mark_page_reserved(page);
 54}
 55
 56#ifndef CONFIG_NEED_MULTIPLE_NODES
 57int page_is_ram(unsigned long pagenr)
 58{
 59	if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
 60		return 1;
 61	else
 62		return 0;
 63}
 64
 65void __init paging_init(void)
 66{
 67	unsigned long max_zone_pfns[MAX_NR_ZONES];
 68	unsigned long lastpfn;
 69
 70	pagetable_init();
 71	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 72	lastpfn = max_low_pfn;
 73	free_area_init_nodes(max_zone_pfns);
 74}
 75
 76void __init mem_init(void)
 77{
 78	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 79	free_all_bootmem();
 80	setup_zero_page();	/* Setup zeroed pages. */
 81
 82	mem_init_print_info(NULL);
 83}
 84#endif /* !CONFIG_NEED_MULTIPLE_NODES */
 85
 86#ifdef CONFIG_BLK_DEV_INITRD
 87void free_initrd_mem(unsigned long start, unsigned long end)
 88{
 89	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
 90			   "initrd");
 91}
 92#endif
 93
 94void __init_refok free_initmem(void)
 95{
 96	free_initmem_default(POISON_FREE_INITMEM);
 97}
 98
 99unsigned long pgd_current;
100
101#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
102
103/*
104 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
105 * are constants.  So we use the variants from asm-offset.h until that gcc
106 * will officially be retired.
107 */
108pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
109pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);