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1 | /* |
2 | * linux/arch/h8300/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, | |
5 | * Kenneth Albanowski <kjahds@kjahds.com>, | |
6 | * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) | |
7 | * | |
8 | * Based on: | |
9 | * | |
10 | * linux/arch/m68knommu/mm/init.c | |
11 | * linux/arch/m68k/mm/init.c | |
12 | * | |
13 | * Copyright (C) 1995 Hamish Macdonald | |
14 | * | |
15 | * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) | |
16 | * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> | |
17 | */ | |
18 | ||
19 | #include <linux/signal.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/ptrace.h> | |
26 | #include <linux/mman.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/swap.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/highmem.h> | |
31 | #include <linux/pagemap.h> | |
32 | #include <linux/bootmem.h> | |
33 | #include <linux/gfp.h> | |
34 | ||
35 | #include <asm/setup.h> | |
36 | #include <asm/segment.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/sections.h> | |
40 | ||
41 | /* | |
42 | * BAD_PAGE is the page that is used for page faults when linux | |
43 | * is out-of-memory. Older versions of linux just did a | |
44 | * do_exit(), but using this instead means there is less risk | |
45 | * for a process dying in kernel mode, possibly leaving a inode | |
46 | * unused etc.. | |
47 | * | |
48 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
49 | * to point to BAD_PAGE entries. | |
50 | * | |
51 | * ZERO_PAGE is a special page that is used for zero-initialized | |
52 | * data and COW. | |
53 | */ | |
54 | static unsigned long empty_bad_page_table; | |
55 | static unsigned long empty_bad_page; | |
56 | unsigned long empty_zero_page; | |
57 | ||
58 | /* | |
59 | * paging_init() continues the virtual memory environment setup which | |
60 | * was begun by the code in arch/head.S. | |
61 | * The parameters are pointers to where to stick the starting and ending | |
62 | * addresses of available kernel virtual memory. | |
63 | */ | |
64 | void __init paging_init(void) | |
65 | { | |
66 | /* | |
67 | * Make sure start_mem is page aligned, otherwise bootmem and | |
68 | * page_alloc get different views og the world. | |
69 | */ | |
70 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
71 | unsigned long end_mem = memory_end & PAGE_MASK; | |
72 | ||
73 | pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", | |
74 | start_mem, end_mem); | |
75 | ||
76 | /* | |
77 | * Initialize the bad page table and bad page to point | |
78 | * to a couple of allocated pages. | |
79 | */ | |
80 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
81 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
82 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
83 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
84 | ||
85 | /* | |
86 | * Set up SFC/DFC registers (user data space). | |
87 | */ | |
88 | set_fs(USER_DS); | |
89 | ||
90 | pr_debug("before free_area_init\n"); | |
91 | ||
92 | pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
93 | start_mem, end_mem); | |
94 | ||
95 | { | |
96 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; | |
97 | ||
98 | zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
99 | free_area_init(zones_size); | |
100 | } | |
101 | } | |
102 | ||
103 | void __init mem_init(void) | |
104 | { | |
105 | pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); | |
106 | ||
107 | high_memory = (void *) (memory_end & PAGE_MASK); | |
108 | max_mapnr = MAP_NR(high_memory); | |
109 | ||
110 | /* this will put all low memory onto the freelists */ | |
111 | free_all_bootmem(); | |
112 | ||
113 | mem_init_print_info(NULL); | |
114 | } | |
115 | ||
116 | ||
117 | #ifdef CONFIG_BLK_DEV_INITRD | |
118 | void free_initrd_mem(unsigned long start, unsigned long end) | |
119 | { | |
120 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); | |
121 | } | |
122 | #endif | |
123 | ||
124 | void | |
125 | free_initmem(void) | |
126 | { | |
127 | free_initmem_default(-1); | |
128 | } |