summaryrefslogtreecommitdiffstats
path: root/arch/score/mm/init.c
blob: 7780eecc5a43005e9a3d7db7fc334b6de93796fa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/*
 * arch/score/mm/init.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *  Chen Liqin <liqin.chen@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/errno.h>
#include <linux/bootmem.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <asm-generic/sections.h>

#include <asm/tlb.h>

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

/*
 * We have up to 8 empty zeroed pages so we can map one of the right colour
 * when needed.
 */
unsigned long zero_page_mask;
unsigned long empty_zero_page;
EXPORT_SYMBOL_GPL(empty_zero_page);

static struct kcore_list kcore_mem, kcore_vmalloc;

unsigned long setup_zero_pages(void)
{
	unsigned int order = 0;
	unsigned long size;
	struct page *page;

	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
	if (!empty_zero_page)
		panic("Oh boy, that early out of memory?");

	page = virt_to_page((void *) empty_zero_page);
	split_page(page, order);
	while (page < virt_to_page((void *) (empty_zero_page +
					     (PAGE_SIZE << order)))) {
		SetPageReserved(page);
		page++;
	}

	size = PAGE_SIZE << order;
	zero_page_mask = (size - 1) & PAGE_MASK;

	return 1UL << order;
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
static int __init page_is_ram(unsigned long pagenr)
{
	if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
		return 1;
	else
		return 0;
}

void __init paging_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES];
	unsigned long lastpfn;

	pagetable_init();
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	lastpfn = max_low_pfn;
	free_area_init_nodes(max_zone_pfns);
}

void __init mem_init(void)
{
	unsigned long codesize, reservedpages, datasize, initsize;
	unsigned long tmp, ram = 0;

	max_mapnr = max_low_pfn;
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	totalram_pages += free_all_bootmem();
	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages. */
	reservedpages = 0;

	for (tmp = 0; tmp < max_low_pfn; tmp++)
		if (page_is_ram(tmp)) {
			ram++;
			if (PageReserved(pfn_to_page(tmp)))
				reservedpages++;
		}

	num_physpages = ram;
	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;

	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *) VMALLOC_START,
			VMALLOC_END - VMALLOC_START);

	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
			"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
			(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
			ram << (PAGE_SHIFT-10), codesize >> 10,
			reservedpages << (PAGE_SHIFT-10), datasize >> 10,
			initsize >> 10,
			(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
}
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void free_init_pages(const char *what, unsigned long begin, unsigned long end)
{
	unsigned long pfn;

	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
		struct page *page = pfn_to_page(pfn);
		void *addr = phys_to_virt(PFN_PHYS(pfn));

		ClearPageReserved(page);
		init_page_count(page);
		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
		__free_page(page);
		totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_init_pages("initrd memory",
	virt_to_phys((void *) start),
	virt_to_phys((void *) end));
}
#endif

void __init_refok free_initmem(void)
{
	free_init_pages("unused kernel memory",
	    (unsigned long)__init_begin, (unsigned long)__init_end);
}

unsigned long pgd_current;

#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))

/*
 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 * are constants.  So we use the variants from asm-offset.h until that gcc
 * will officially be retired.
 */
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);