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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 | ||
1da177e4 LT |
18 | #include <linux/signal.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/swap.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/highmem.h> | |
30 | #include <linux/pagemap.h> | |
31 | #include <linux/bootmem.h> | |
32 | #include <linux/slab.h> | |
33 | ||
34 | #include <asm/setup.h> | |
35 | #include <asm/segment.h> | |
36 | #include <asm/page.h> | |
37 | #include <asm/pgtable.h> | |
38 | #include <asm/system.h> | |
39 | #include <asm/machdep.h> | |
40 | ||
41 | #undef DEBUG | |
42 | ||
43 | extern void die_if_kernel(char *,struct pt_regs *,long); | |
44 | extern void free_initmem(void); | |
45 | ||
46 | /* | |
47 | * BAD_PAGE is the page that is used for page faults when linux | |
48 | * is out-of-memory. Older versions of linux just did a | |
49 | * do_exit(), but using this instead means there is less risk | |
50 | * for a process dying in kernel mode, possibly leaving a inode | |
51 | * unused etc.. | |
52 | * | |
53 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
54 | * to point to BAD_PAGE entries. | |
55 | * | |
56 | * ZERO_PAGE is a special page that is used for zero-initialized | |
57 | * data and COW. | |
58 | */ | |
59 | static unsigned long empty_bad_page_table; | |
60 | ||
61 | static unsigned long empty_bad_page; | |
62 | ||
63 | unsigned long empty_zero_page; | |
64 | ||
1da177e4 LT |
65 | void show_mem(void) |
66 | { | |
67 | unsigned long i; | |
68 | int free = 0, total = 0, reserved = 0, shared = 0; | |
69 | int cached = 0; | |
70 | ||
71 | printk(KERN_INFO "\nMem-info:\n"); | |
72 | show_free_areas(); | |
73 | i = max_mapnr; | |
74 | while (i-- > 0) { | |
75 | total++; | |
76 | if (PageReserved(mem_map+i)) | |
77 | reserved++; | |
78 | else if (PageSwapCache(mem_map+i)) | |
79 | cached++; | |
80 | else if (!page_count(mem_map+i)) | |
81 | free++; | |
82 | else | |
83 | shared += page_count(mem_map+i) - 1; | |
84 | } | |
85 | printk(KERN_INFO "%d pages of RAM\n",total); | |
86 | printk(KERN_INFO "%d free pages\n",free); | |
87 | printk(KERN_INFO "%d reserved pages\n",reserved); | |
88 | printk(KERN_INFO "%d pages shared\n",shared); | |
89 | printk(KERN_INFO "%d pages swap cached\n",cached); | |
90 | } | |
91 | ||
92 | extern unsigned long memory_start; | |
93 | extern unsigned long memory_end; | |
94 | ||
95 | /* | |
96 | * paging_init() continues the virtual memory environment setup which | |
97 | * was begun by the code in arch/head.S. | |
98 | * The parameters are pointers to where to stick the starting and ending | |
99 | * addresses of available kernel virtual memory. | |
100 | */ | |
101 | void paging_init(void) | |
102 | { | |
103 | /* | |
104 | * Make sure start_mem is page aligned, otherwise bootmem and | |
105 | * page_alloc get different views of the world. | |
106 | */ | |
107 | #ifdef DEBUG | |
108 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
109 | #endif | |
110 | unsigned long end_mem = memory_end & PAGE_MASK; | |
111 | ||
112 | #ifdef DEBUG | |
113 | printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n", | |
114 | start_mem, end_mem); | |
115 | #endif | |
116 | ||
117 | /* | |
118 | * Initialize the bad page table and bad page to point | |
119 | * to a couple of allocated pages. | |
120 | */ | |
121 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
122 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
123 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
124 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
125 | ||
126 | /* | |
127 | * Set up SFC/DFC registers (user data space). | |
128 | */ | |
129 | set_fs (USER_DS); | |
130 | ||
131 | #ifdef DEBUG | |
132 | printk (KERN_DEBUG "before free_area_init\n"); | |
133 | ||
134 | printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
135 | start_mem, end_mem); | |
136 | #endif | |
137 | ||
138 | { | |
139 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
140 | ||
141 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
142 | zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
143 | #ifdef CONFIG_HIGHMEM | |
144 | zones_size[ZONE_HIGHMEM] = 0; | |
145 | #endif | |
146 | free_area_init(zones_size); | |
147 | } | |
148 | } | |
149 | ||
150 | void mem_init(void) | |
151 | { | |
152 | int codek = 0, datak = 0, initk = 0; | |
153 | unsigned long tmp; | |
154 | extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end; | |
155 | extern unsigned int _ramend, _rambase; | |
156 | unsigned long len = _ramend - _rambase; | |
157 | unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ | |
158 | unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ | |
159 | ||
160 | #ifdef DEBUG | |
161 | printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); | |
162 | #endif | |
163 | ||
164 | end_mem &= PAGE_MASK; | |
165 | high_memory = (void *) end_mem; | |
166 | ||
167 | start_mem = PAGE_ALIGN(start_mem); | |
168 | max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT; | |
169 | ||
170 | /* this will put all memory onto the freelists */ | |
171 | totalram_pages = free_all_bootmem(); | |
172 | ||
173 | codek = (&_etext - &_stext) >> 10; | |
174 | datak = (&_ebss - &_sdata) >> 10; | |
175 | initk = (&__init_begin - &__init_end) >> 10; | |
176 | ||
177 | tmp = nr_free_pages() << PAGE_SHIFT; | |
2082b477 | 178 | printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n", |
1da177e4 LT |
179 | tmp >> 10, |
180 | len >> 10, | |
1da177e4 LT |
181 | codek, |
182 | datak | |
183 | ); | |
184 | } | |
185 | ||
186 | ||
187 | #ifdef CONFIG_BLK_DEV_INITRD | |
188 | void free_initrd_mem(unsigned long start, unsigned long end) | |
189 | { | |
190 | int pages = 0; | |
191 | for (; start < end; start += PAGE_SIZE) { | |
192 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 193 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
194 | free_page(start); |
195 | totalram_pages++; | |
196 | pages++; | |
197 | } | |
198 | printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages); | |
199 | } | |
200 | #endif | |
201 | ||
202 | void | |
203 | free_initmem() | |
204 | { | |
205 | #ifdef CONFIG_RAMKERNEL | |
206 | unsigned long addr; | |
207 | extern char __init_begin, __init_end; | |
208 | /* | |
209 | * The following code should be cool even if these sections | |
210 | * are not page aligned. | |
211 | */ | |
212 | addr = PAGE_ALIGN((unsigned long)(&__init_begin)); | |
213 | /* next to check that the page we free is not a partial page */ | |
214 | for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) { | |
215 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 216 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
217 | free_page(addr); |
218 | totalram_pages++; | |
219 | } | |
220 | printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n", | |
221 | (addr - PAGE_ALIGN((long) &__init_begin)) >> 10, | |
222 | (int)(PAGE_ALIGN((unsigned long)(&__init_begin))), | |
223 | (int)(addr - PAGE_SIZE)); | |
224 | #endif | |
225 | } | |
226 |