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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68knommu/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/m68k/mm/init.c | |
11 | * | |
12 | * Copyright (C) 1995 Hamish Macdonald | |
13 | * | |
14 | * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) | |
15 | * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> | |
16 | */ | |
17 | ||
18 | #include <linux/config.h> | |
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/slab.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/system.h> | |
40 | #include <asm/machdep.h> | |
41 | ||
42 | #undef DEBUG | |
43 | ||
44 | extern void die_if_kernel(char *,struct pt_regs *,long); | |
45 | extern void free_initmem(void); | |
46 | ||
47 | /* | |
48 | * BAD_PAGE is the page that is used for page faults when linux | |
49 | * is out-of-memory. Older versions of linux just did a | |
50 | * do_exit(), but using this instead means there is less risk | |
51 | * for a process dying in kernel mode, possibly leaving a inode | |
52 | * unused etc.. | |
53 | * | |
54 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
55 | * to point to BAD_PAGE entries. | |
56 | * | |
57 | * ZERO_PAGE is a special page that is used for zero-initialized | |
58 | * data and COW. | |
59 | */ | |
60 | static unsigned long empty_bad_page_table; | |
61 | ||
62 | static unsigned long empty_bad_page; | |
63 | ||
64 | unsigned long empty_zero_page; | |
65 | ||
66 | extern unsigned long rom_length; | |
67 | ||
68 | void show_mem(void) | |
69 | { | |
70 | unsigned long i; | |
71 | int free = 0, total = 0, reserved = 0, shared = 0; | |
72 | int cached = 0; | |
73 | ||
74 | printk(KERN_INFO "\nMem-info:\n"); | |
75 | show_free_areas(); | |
76 | i = max_mapnr; | |
77 | while (i-- > 0) { | |
78 | total++; | |
79 | if (PageReserved(mem_map+i)) | |
80 | reserved++; | |
81 | else if (PageSwapCache(mem_map+i)) | |
82 | cached++; | |
83 | else if (!page_count(mem_map+i)) | |
84 | free++; | |
85 | else | |
86 | shared += page_count(mem_map+i) - 1; | |
87 | } | |
88 | printk(KERN_INFO "%d pages of RAM\n",total); | |
89 | printk(KERN_INFO "%d free pages\n",free); | |
90 | printk(KERN_INFO "%d reserved pages\n",reserved); | |
91 | printk(KERN_INFO "%d pages shared\n",shared); | |
92 | printk(KERN_INFO "%d pages swap cached\n",cached); | |
93 | } | |
94 | ||
95 | extern unsigned long memory_start; | |
96 | extern unsigned long memory_end; | |
97 | ||
98 | /* | |
99 | * paging_init() continues the virtual memory environment setup which | |
100 | * was begun by the code in arch/head.S. | |
101 | * The parameters are pointers to where to stick the starting and ending | |
102 | * addresses of available kernel virtual memory. | |
103 | */ | |
104 | void paging_init(void) | |
105 | { | |
106 | /* | |
107 | * Make sure start_mem is page aligned, otherwise bootmem and | |
108 | * page_alloc get different views of the world. | |
109 | */ | |
110 | #ifdef DEBUG | |
111 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
112 | #endif | |
113 | unsigned long end_mem = memory_end & PAGE_MASK; | |
114 | ||
115 | #ifdef DEBUG | |
116 | printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n", | |
117 | start_mem, end_mem); | |
118 | #endif | |
119 | ||
120 | /* | |
121 | * Initialize the bad page table and bad page to point | |
122 | * to a couple of allocated pages. | |
123 | */ | |
124 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
125 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
126 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
127 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
128 | ||
129 | /* | |
130 | * Set up SFC/DFC registers (user data space). | |
131 | */ | |
132 | set_fs (USER_DS); | |
133 | ||
134 | #ifdef DEBUG | |
135 | printk (KERN_DEBUG "before free_area_init\n"); | |
136 | ||
137 | printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
138 | start_mem, end_mem); | |
139 | #endif | |
140 | ||
141 | { | |
142 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
143 | ||
144 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
145 | zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
146 | #ifdef CONFIG_HIGHMEM | |
147 | zones_size[ZONE_HIGHMEM] = 0; | |
148 | #endif | |
149 | free_area_init(zones_size); | |
150 | } | |
151 | } | |
152 | ||
153 | void mem_init(void) | |
154 | { | |
155 | int codek = 0, datak = 0, initk = 0; | |
156 | unsigned long tmp; | |
157 | extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end; | |
158 | extern unsigned int _ramend, _rambase; | |
159 | unsigned long len = _ramend - _rambase; | |
160 | unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ | |
161 | unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ | |
162 | ||
163 | #ifdef DEBUG | |
164 | printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); | |
165 | #endif | |
166 | ||
167 | end_mem &= PAGE_MASK; | |
168 | high_memory = (void *) end_mem; | |
169 | ||
170 | start_mem = PAGE_ALIGN(start_mem); | |
171 | max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT; | |
172 | ||
173 | /* this will put all memory onto the freelists */ | |
174 | totalram_pages = free_all_bootmem(); | |
175 | ||
176 | codek = (&_etext - &_stext) >> 10; | |
177 | datak = (&_ebss - &_sdata) >> 10; | |
178 | initk = (&__init_begin - &__init_end) >> 10; | |
179 | ||
180 | tmp = nr_free_pages() << PAGE_SHIFT; | |
181 | printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n", | |
182 | tmp >> 10, | |
183 | len >> 10, | |
184 | (rom_length > 0) ? ((rom_length >> 10) - codek) : 0, | |
185 | rom_length >> 10, | |
186 | codek, | |
187 | datak | |
188 | ); | |
189 | } | |
190 | ||
191 | ||
192 | #ifdef CONFIG_BLK_DEV_INITRD | |
193 | void free_initrd_mem(unsigned long start, unsigned long end) | |
194 | { | |
195 | int pages = 0; | |
196 | for (; start < end; start += PAGE_SIZE) { | |
197 | ClearPageReserved(virt_to_page(start)); | |
198 | set_page_count(virt_to_page(start), 1); | |
199 | free_page(start); | |
200 | totalram_pages++; | |
201 | pages++; | |
202 | } | |
203 | printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages); | |
204 | } | |
205 | #endif | |
206 | ||
207 | void | |
208 | free_initmem() | |
209 | { | |
210 | #ifdef CONFIG_RAMKERNEL | |
211 | unsigned long addr; | |
212 | extern char __init_begin, __init_end; | |
213 | /* | |
214 | * The following code should be cool even if these sections | |
215 | * are not page aligned. | |
216 | */ | |
217 | addr = PAGE_ALIGN((unsigned long)(&__init_begin)); | |
218 | /* next to check that the page we free is not a partial page */ | |
219 | for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) { | |
220 | ClearPageReserved(virt_to_page(addr)); | |
221 | set_page_count(virt_to_page(addr), 1); | |
222 | free_page(addr); | |
223 | totalram_pages++; | |
224 | } | |
225 | printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n", | |
226 | (addr - PAGE_ALIGN((long) &__init_begin)) >> 10, | |
227 | (int)(PAGE_ALIGN((unsigned long)(&__init_begin))), | |
228 | (int)(addr - PAGE_SIZE)); | |
229 | #endif | |
230 | } | |
231 |