init.c revision d8aa899bb27ad7879ab9e621365e04ada2745a65 
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/init.h>
30#include <linux/mm.h>
31#include <linux/mman.h>
32#include <linux/pagemap.h>
33#include <linux/proc_fs.h>
34#include <linux/sched.h>
35#include <linux/initrd.h>
36
37#include <asm/sections.h>
38#include <asm/tlb.h>
39
40DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
41
42unsigned long empty_zero_page;
43EXPORT_SYMBOL_GPL(empty_zero_page);
44
45static struct kcore_list kcore_mem, kcore_vmalloc;
46
47static unsigned long setup_zero_page(void)
48{
49	struct page *page;
50
51	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
52	if (!empty_zero_page)
53		panic("Oh boy, that early out of memory?");
54
55	page = virt_to_page((void *) empty_zero_page);
56	SetPageReserved(page);
57
58	return 1UL;
59}
60
61#ifndef CONFIG_NEED_MULTIPLE_NODES
62static int __init page_is_ram(unsigned long pagenr)
63{
64	if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
65		return 1;
66	else
67		return 0;
68}
69
70void __init paging_init(void)
71{
72	unsigned long max_zone_pfns[MAX_NR_ZONES];
73	unsigned long lastpfn;
74
75	pagetable_init();
76	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
77	lastpfn = max_low_pfn;
78	free_area_init_nodes(max_zone_pfns);
79}
80
81void __init mem_init(void)
82{
83	unsigned long codesize, reservedpages, datasize, initsize;
84	unsigned long tmp, ram = 0;
85
86	max_mapnr = max_low_pfn;
87	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
88	totalram_pages += free_all_bootmem();
89	totalram_pages -= setup_zero_page();	/* Setup zeroed pages. */
90	reservedpages = 0;
91
92	for (tmp = 0; tmp < max_low_pfn; tmp++)
93		if (page_is_ram(tmp)) {
94			ram++;
95			if (PageReserved(pfn_to_page(tmp)))
96				reservedpages++;
97		}
98
99	num_physpages = ram;
100	codesize = (unsigned long) &_etext - (unsigned long) &_text;
101	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
102	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
103
104	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
105	kclist_add(&kcore_vmalloc, (void *) VMALLOC_START,
106			VMALLOC_END - VMALLOC_START);
107
108	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
109			"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
110			(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
111			ram << (PAGE_SHIFT-10), codesize >> 10,
112			reservedpages << (PAGE_SHIFT-10), datasize >> 10,
113			initsize >> 10,
114			(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
115}
116#endif /* !CONFIG_NEED_MULTIPLE_NODES */
117
118static void free_init_pages(const char *what, unsigned long begin, unsigned long end)
119{
120	unsigned long pfn;
121
122	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
123		struct page *page = pfn_to_page(pfn);
124		void *addr = phys_to_virt(PFN_PHYS(pfn));
125
126		ClearPageReserved(page);
127		init_page_count(page);
128		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
129		__free_page(page);
130		totalram_pages++;
131	}
132	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
133}
134
135#ifdef CONFIG_BLK_DEV_INITRD
136void free_initrd_mem(unsigned long start, unsigned long end)
137{
138	free_init_pages("initrd memory",
139		virt_to_phys((void *) start),
140		virt_to_phys((void *) end));
141}
142#endif
143
144void __init_refok free_initmem(void)
145{
146	free_init_pages("unused kernel memory",
147	__pa(&__init_begin),
148	__pa(&__init_end));
149}
150
151unsigned long pgd_current;
152
153#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
154
155/*
156 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
157 * are constants.  So we use the variants from asm-offset.h until that gcc
158 * will officially be retired.
159 */
160pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
161pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
162