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
41 unsigned long empty_zero_page;
42 EXPORT_SYMBOL_GPL(empty_zero_page);
43
setup_zero_page(void)44 static 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
page_is_ram(unsigned long pagenr)57 int 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
paging_init(void)65 void __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
mem_init(void)76 void __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
free_initrd_mem(unsigned long start,unsigned long end)87 void 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
free_initmem(void)94 void __init_refok free_initmem(void)
95 {
96 free_initmem_default(POISON_FREE_INITMEM);
97 }
98
99 unsigned 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 */
108 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PTE_ORDER);
109 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
110