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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
5a0e3ad6 | 33 | #include <linux/gfp.h> |
1da177e4 LT |
34 | |
35 | #include <asm/setup.h> | |
36 | #include <asm/segment.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/pgtable.h> | |
39 | #include <asm/system.h> | |
40 | ||
41 | #undef DEBUG | |
42 | ||
1da177e4 LT |
43 | /* |
44 | * BAD_PAGE is the page that is used for page faults when linux | |
45 | * is out-of-memory. Older versions of linux just did a | |
46 | * do_exit(), but using this instead means there is less risk | |
47 | * for a process dying in kernel mode, possibly leaving a inode | |
48 | * unused etc.. | |
49 | * | |
50 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
51 | * to point to BAD_PAGE entries. | |
52 | * | |
53 | * ZERO_PAGE is a special page that is used for zero-initialized | |
54 | * data and COW. | |
55 | */ | |
56 | static unsigned long empty_bad_page_table; | |
57 | ||
58 | static unsigned long empty_bad_page; | |
59 | ||
60 | unsigned long empty_zero_page; | |
61 | ||
62 | extern unsigned long rom_length; | |
63 | ||
1da177e4 LT |
64 | extern unsigned long memory_start; |
65 | extern unsigned long memory_end; | |
66 | ||
67 | /* | |
68 | * paging_init() continues the virtual memory environment setup which | |
69 | * was begun by the code in arch/head.S. | |
70 | * The parameters are pointers to where to stick the starting and ending | |
71 | * addresses of available kernel virtual memory. | |
72 | */ | |
9de15e91 | 73 | void __init paging_init(void) |
1da177e4 LT |
74 | { |
75 | /* | |
76 | * Make sure start_mem is page aligned, otherwise bootmem and | |
77 | * page_alloc get different views og the world. | |
78 | */ | |
79 | #ifdef DEBUG | |
80 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
81 | #endif | |
82 | unsigned long end_mem = memory_end & PAGE_MASK; | |
83 | ||
84 | #ifdef DEBUG | |
85 | printk ("start_mem is %#lx\nvirtual_end is %#lx\n", | |
86 | start_mem, end_mem); | |
87 | #endif | |
88 | ||
89 | /* | |
90 | * Initialize the bad page table and bad page to point | |
91 | * to a couple of allocated pages. | |
92 | */ | |
93 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
94 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
95 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
96 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
97 | ||
98 | /* | |
99 | * Set up SFC/DFC registers (user data space). | |
100 | */ | |
101 | set_fs (USER_DS); | |
102 | ||
103 | #ifdef DEBUG | |
104 | printk ("before free_area_init\n"); | |
105 | ||
106 | printk ("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
107 | start_mem, end_mem); | |
108 | #endif | |
109 | ||
110 | { | |
f06a9684 | 111 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 LT |
112 | |
113 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
114 | zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
115 | #ifdef CONFIG_HIGHMEM | |
116 | zones_size[ZONE_HIGHMEM] = 0; | |
117 | #endif | |
118 | free_area_init(zones_size); | |
119 | } | |
120 | } | |
121 | ||
9de15e91 | 122 | void __init mem_init(void) |
1da177e4 LT |
123 | { |
124 | int codek = 0, datak = 0, initk = 0; | |
125 | /* DAVIDM look at setup memory map generically with reserved area */ | |
126 | unsigned long tmp; | |
127 | extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end; | |
128 | extern unsigned long _ramend, _ramstart; | |
129 | unsigned long len = &_ramend - &_ramstart; | |
130 | unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ | |
131 | unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ | |
132 | ||
133 | #ifdef DEBUG | |
134 | printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); | |
135 | #endif | |
136 | ||
137 | end_mem &= PAGE_MASK; | |
138 | high_memory = (void *) end_mem; | |
139 | ||
140 | start_mem = PAGE_ALIGN(start_mem); | |
141 | max_mapnr = num_physpages = MAP_NR(high_memory); | |
142 | ||
143 | /* this will put all memory onto the freelists */ | |
144 | totalram_pages = free_all_bootmem(); | |
145 | ||
146 | codek = (&_etext - &_stext) >> 10; | |
147 | datak = (&_ebss - &_sdata) >> 10; | |
148 | initk = (&__init_begin - &__init_end) >> 10; | |
149 | ||
150 | tmp = nr_free_pages() << PAGE_SHIFT; | |
151 | printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n", | |
152 | tmp >> 10, | |
153 | len >> 10, | |
154 | (rom_length > 0) ? ((rom_length >> 10) - codek) : 0, | |
155 | rom_length >> 10, | |
156 | codek, | |
157 | datak | |
158 | ); | |
159 | } | |
160 | ||
161 | ||
162 | #ifdef CONFIG_BLK_DEV_INITRD | |
163 | void free_initrd_mem(unsigned long start, unsigned long end) | |
164 | { | |
165 | int pages = 0; | |
166 | for (; start < end; start += PAGE_SIZE) { | |
167 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 168 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
169 | free_page(start); |
170 | totalram_pages++; | |
171 | pages++; | |
172 | } | |
173 | printk ("Freeing initrd memory: %dk freed\n", pages); | |
174 | } | |
175 | #endif | |
176 | ||
177 | void | |
9de15e91 | 178 | free_initmem(void) |
1da177e4 LT |
179 | { |
180 | #ifdef CONFIG_RAMKERNEL | |
181 | unsigned long addr; | |
182 | extern char __init_begin, __init_end; | |
183 | /* | |
184 | * the following code should be cool even if these sections | |
185 | * are not page aligned. | |
186 | */ | |
187 | addr = PAGE_ALIGN((unsigned long)(&__init_begin)); | |
188 | /* next to check that the page we free is not a partial page */ | |
189 | for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) { | |
190 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 191 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
192 | free_page(addr); |
193 | totalram_pages++; | |
194 | } | |
195 | printk(KERN_INFO "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n", | |
196 | (addr - PAGE_ALIGN((long) &__init_begin)) >> 10, | |
197 | (int)(PAGE_ALIGN((unsigned long)(&__init_begin))), | |
198 | (int)(addr - PAGE_SIZE)); | |
199 | #endif | |
200 | } | |
201 |