init.c revision 11199692d83dd3fe1511203024fb9853d176ec4c 
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	unsigned long codesize, reservedpages, datasize, initsize;
79	unsigned long tmp, ram = 0;
80
81	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
82	totalram_pages += free_all_bootmem();
83	setup_zero_page();	/* Setup zeroed pages. */
84	reservedpages = 0;
85
86	for (tmp = 0; tmp < max_low_pfn; tmp++)
87		if (page_is_ram(tmp)) {
88			ram++;
89			if (PageReserved(pfn_to_page(tmp)))
90				reservedpages++;
91		}
92
93	num_physpages = ram;
94	codesize = (unsigned long) &_etext - (unsigned long) &_text;
95	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
96	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
97
98	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
99			"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
100			(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
101			ram << (PAGE_SHIFT-10), codesize >> 10,
102			reservedpages << (PAGE_SHIFT-10), datasize >> 10,
103			initsize >> 10,
104			totalhigh_pages << (PAGE_SHIFT-10));
105}
106#endif /* !CONFIG_NEED_MULTIPLE_NODES */
107
108#ifdef CONFIG_BLK_DEV_INITRD
109void free_initrd_mem(unsigned long start, unsigned long end)
110{
111	free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
112			   "initrd");
113}
114#endif
115
116void __init_refok free_initmem(void)
117{
118	free_initmem_default(POISON_FREE_INITMEM);
119}
120
121unsigned long pgd_current;
122
123#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
124
125/*
126 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
127 * are constants.  So we use the variants from asm-offset.h until that gcc
128 * will officially be retired.
129 */
130pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
131pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
132