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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 | extern unsigned long memory_start; |
66 | extern unsigned long memory_end; | |
67 | ||
68 | /* | |
69 | * paging_init() continues the virtual memory environment setup which | |
70 | * was begun by the code in arch/head.S. | |
71 | * The parameters are pointers to where to stick the starting and ending | |
72 | * addresses of available kernel virtual memory. | |
73 | */ | |
f386c3cc | 74 | void __init paging_init(void) |
1da177e4 LT |
75 | { |
76 | /* | |
77 | * Make sure start_mem is page aligned, otherwise bootmem and | |
78 | * page_alloc get different views of the world. | |
79 | */ | |
80 | #ifdef DEBUG | |
81 | unsigned long start_mem = PAGE_ALIGN(memory_start); | |
82 | #endif | |
83 | unsigned long end_mem = memory_end & PAGE_MASK; | |
84 | ||
85 | #ifdef DEBUG | |
86 | printk (KERN_DEBUG "start_mem is %#lx\nvirtual_end is %#lx\n", | |
87 | start_mem, end_mem); | |
88 | #endif | |
89 | ||
90 | /* | |
91 | * Initialize the bad page table and bad page to point | |
92 | * to a couple of allocated pages. | |
93 | */ | |
94 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
95 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
96 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
97 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
98 | ||
99 | /* | |
100 | * Set up SFC/DFC registers (user data space). | |
101 | */ | |
102 | set_fs (USER_DS); | |
103 | ||
104 | #ifdef DEBUG | |
105 | printk (KERN_DEBUG "before free_area_init\n"); | |
106 | ||
107 | printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", | |
108 | start_mem, end_mem); | |
109 | #endif | |
110 | ||
111 | { | |
f06a9684 | 112 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 | 113 | |
dffc9efc | 114 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
1da177e4 LT |
115 | free_area_init(zones_size); |
116 | } | |
117 | } | |
118 | ||
f386c3cc | 119 | void __init mem_init(void) |
1da177e4 LT |
120 | { |
121 | int codek = 0, datak = 0, initk = 0; | |
122 | unsigned long tmp; | |
123 | extern char _etext, _stext, _sdata, _ebss, __init_begin, __init_end; | |
124 | extern unsigned int _ramend, _rambase; | |
125 | unsigned long len = _ramend - _rambase; | |
126 | unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ | |
127 | unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ | |
128 | ||
308e610e | 129 | pr_debug("Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); |
1da177e4 LT |
130 | |
131 | end_mem &= PAGE_MASK; | |
132 | high_memory = (void *) end_mem; | |
133 | ||
134 | start_mem = PAGE_ALIGN(start_mem); | |
135 | max_mapnr = num_physpages = (((unsigned long) high_memory) - PAGE_OFFSET) >> PAGE_SHIFT; | |
136 | ||
137 | /* this will put all memory onto the freelists */ | |
138 | totalram_pages = free_all_bootmem(); | |
139 | ||
140 | codek = (&_etext - &_stext) >> 10; | |
141 | datak = (&_ebss - &_sdata) >> 10; | |
142 | initk = (&__init_begin - &__init_end) >> 10; | |
143 | ||
144 | tmp = nr_free_pages() << PAGE_SHIFT; | |
2082b477 | 145 | printk(KERN_INFO "Memory available: %luk/%luk RAM, (%dk kernel code, %dk data)\n", |
1da177e4 LT |
146 | tmp >> 10, |
147 | len >> 10, | |
1da177e4 LT |
148 | codek, |
149 | datak | |
150 | ); | |
151 | } | |
152 | ||
153 | ||
154 | #ifdef CONFIG_BLK_DEV_INITRD | |
155 | void free_initrd_mem(unsigned long start, unsigned long end) | |
156 | { | |
157 | int pages = 0; | |
158 | for (; start < end; start += PAGE_SIZE) { | |
159 | ClearPageReserved(virt_to_page(start)); | |
7835e98b | 160 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
161 | free_page(start); |
162 | totalram_pages++; | |
163 | pages++; | |
164 | } | |
cd15e8c3 | 165 | printk (KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages * (PAGE_SIZE / 1024)); |
1da177e4 LT |
166 | } |
167 | #endif | |
168 | ||
169 | void | |
170 | free_initmem() | |
171 | { | |
172 | #ifdef CONFIG_RAMKERNEL | |
173 | unsigned long addr; | |
174 | extern char __init_begin, __init_end; | |
175 | /* | |
176 | * The following code should be cool even if these sections | |
177 | * are not page aligned. | |
178 | */ | |
179 | addr = PAGE_ALIGN((unsigned long)(&__init_begin)); | |
180 | /* next to check that the page we free is not a partial page */ | |
181 | for (; addr + PAGE_SIZE < (unsigned long)(&__init_end); addr +=PAGE_SIZE) { | |
182 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 183 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
184 | free_page(addr); |
185 | totalram_pages++; | |
186 | } | |
187 | printk(KERN_NOTICE "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n", | |
188 | (addr - PAGE_ALIGN((long) &__init_begin)) >> 10, | |
189 | (int)(PAGE_ALIGN((unsigned long)(&__init_begin))), | |
190 | (int)(addr - PAGE_SIZE)); | |
191 | #endif | |
192 | } | |
193 |