Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/m32r/mm/init.c | |
3 | * | |
4 | * Copyright (c) 2001, 2002 Hitoshi Yamamoto | |
5 | * | |
6 | * Some code taken from sh version. | |
7 | * Copyright (C) 1999 Niibe Yutaka | |
8 | * Based on linux/arch/i386/mm/init.c: | |
9 | * Copyright (C) 1995 Linus Torvalds | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/bootmem.h> | |
17 | #include <linux/swap.h> | |
18 | #include <linux/highmem.h> | |
19 | #include <linux/bitops.h> | |
20 | #include <linux/nodemask.h> | |
22a9835c | 21 | #include <linux/pfn.h> |
1da177e4 LT |
22 | #include <asm/types.h> |
23 | #include <asm/processor.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/pgtable.h> | |
26 | #include <asm/pgalloc.h> | |
27 | #include <asm/mmu_context.h> | |
28 | #include <asm/setup.h> | |
29 | #include <asm/tlb.h> | |
30 | ||
31 | /* References to section boundaries */ | |
32 | extern char _text, _etext, _edata; | |
33 | extern char __init_begin, __init_end; | |
34 | ||
35 | pgd_t swapper_pg_dir[1024]; | |
36 | ||
37 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
38 | ||
39 | void show_mem(void) | |
40 | { | |
41 | int total = 0, reserved = 0; | |
42 | int shared = 0, cached = 0; | |
43 | int highmem = 0; | |
44 | struct page *page; | |
45 | pg_data_t *pgdat; | |
46 | unsigned long i; | |
47 | ||
48 | printk("Mem-info:\n"); | |
49 | show_free_areas(); | |
50 | printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10)); | |
ec936fc5 | 51 | for_each_online_pgdat(pgdat) { |
208d54e5 DH |
52 | unsigned long flags; |
53 | pgdat_resize_lock(pgdat, &flags); | |
1da177e4 | 54 | for (i = 0; i < pgdat->node_spanned_pages; ++i) { |
408fde81 | 55 | page = pgdat_page_nr(pgdat, i); |
1da177e4 LT |
56 | total++; |
57 | if (PageHighMem(page)) | |
58 | highmem++; | |
59 | if (PageReserved(page)) | |
60 | reserved++; | |
61 | else if (PageSwapCache(page)) | |
62 | cached++; | |
63 | else if (page_count(page)) | |
64 | shared += page_count(page) - 1; | |
65 | } | |
208d54e5 | 66 | pgdat_resize_unlock(pgdat, &flags); |
1da177e4 LT |
67 | } |
68 | printk("%d pages of RAM\n", total); | |
69 | printk("%d pages of HIGHMEM\n",highmem); | |
70 | printk("%d reserved pages\n",reserved); | |
71 | printk("%d pages shared\n",shared); | |
72 | printk("%d pages swap cached\n",cached); | |
73 | } | |
74 | ||
75 | /* | |
76 | * Cache of MMU context last used. | |
77 | */ | |
78 | #ifndef CONFIG_SMP | |
79 | unsigned long mmu_context_cache_dat; | |
80 | #else | |
81 | unsigned long mmu_context_cache_dat[NR_CPUS]; | |
82 | #endif | |
83 | static unsigned long hole_pages; | |
84 | ||
85 | /* | |
86 | * function prototype | |
87 | */ | |
88 | void __init paging_init(void); | |
89 | void __init mem_init(void); | |
90 | void free_initmem(void); | |
91 | #ifdef CONFIG_BLK_DEV_INITRD | |
92 | void free_initrd_mem(unsigned long, unsigned long); | |
93 | #endif | |
94 | ||
95 | /* It'd be good if these lines were in the standard header file. */ | |
3560e249 | 96 | #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn) |
1da177e4 LT |
97 | #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn) |
98 | ||
99 | #ifndef CONFIG_DISCONTIGMEM | |
100 | unsigned long __init zone_sizes_init(void) | |
101 | { | |
f06a9684 | 102 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 LT |
103 | unsigned long max_dma; |
104 | unsigned long low; | |
105 | unsigned long start_pfn; | |
106 | ||
107 | #ifdef CONFIG_MMU | |
108 | start_pfn = START_PFN(0); | |
109 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
110 | low = MAX_LOW_PFN(0); | |
111 | ||
112 | if (low < max_dma){ | |
113 | zones_size[ZONE_DMA] = low - start_pfn; | |
114 | zones_size[ZONE_NORMAL] = 0; | |
115 | } else { | |
116 | zones_size[ZONE_DMA] = low - start_pfn; | |
117 | zones_size[ZONE_NORMAL] = low - max_dma; | |
118 | } | |
119 | #else | |
120 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
121 | zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; | |
122 | start_pfn = __MEMORY_START >> PAGE_SHIFT; | |
123 | #endif /* CONFIG_MMU */ | |
124 | ||
9109fb7b | 125 | free_area_init_node(0, zones_size, start_pfn, 0); |
1da177e4 LT |
126 | |
127 | return 0; | |
128 | } | |
129 | #else /* CONFIG_DISCONTIGMEM */ | |
130 | extern unsigned long zone_sizes_init(void); | |
131 | #endif /* CONFIG_DISCONTIGMEM */ | |
132 | ||
133 | /*======================================================================* | |
134 | * paging_init() : sets up the page tables | |
135 | *======================================================================*/ | |
136 | void __init paging_init(void) | |
137 | { | |
138 | #ifdef CONFIG_MMU | |
139 | int i; | |
140 | pgd_t *pg_dir; | |
141 | ||
142 | /* We don't need kernel mapping as hardware support that. */ | |
143 | pg_dir = swapper_pg_dir; | |
144 | ||
145 | for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++) | |
146 | pgd_val(pg_dir[i]) = 0; | |
147 | #endif /* CONFIG_MMU */ | |
148 | hole_pages = zone_sizes_init(); | |
149 | } | |
150 | ||
151 | int __init reservedpages_count(void) | |
152 | { | |
153 | int reservedpages, nid, i; | |
154 | ||
155 | reservedpages = 0; | |
208d54e5 DH |
156 | for_each_online_node(nid) { |
157 | unsigned long flags; | |
158 | pgdat_resize_lock(NODE_DATA(nid), &flags); | |
1da177e4 | 159 | for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++) |
408fde81 | 160 | if (PageReserved(nid_page_nr(nid, i))) |
1da177e4 | 161 | reservedpages++; |
208d54e5 DH |
162 | pgdat_resize_unlock(NODE_DATA(nid), &flags); |
163 | } | |
1da177e4 LT |
164 | |
165 | return reservedpages; | |
166 | } | |
167 | ||
168 | /*======================================================================* | |
169 | * mem_init() : | |
170 | * orig : arch/sh/mm/init.c | |
171 | *======================================================================*/ | |
172 | void __init mem_init(void) | |
173 | { | |
174 | int codesize, reservedpages, datasize, initsize; | |
175 | int nid; | |
176 | #ifndef CONFIG_MMU | |
177 | extern unsigned long memory_end; | |
178 | #endif | |
179 | ||
180 | num_physpages = 0; | |
181 | for_each_online_node(nid) | |
182 | num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1; | |
183 | ||
184 | num_physpages -= hole_pages; | |
185 | ||
186 | #ifndef CONFIG_DISCONTIGMEM | |
187 | max_mapnr = num_physpages; | |
188 | #endif /* CONFIG_DISCONTIGMEM */ | |
189 | ||
190 | #ifdef CONFIG_MMU | |
191 | high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); | |
192 | #else | |
193 | high_memory = (void *)(memory_end & PAGE_MASK); | |
194 | #endif /* CONFIG_MMU */ | |
195 | ||
196 | /* clear the zero-page */ | |
197 | memset(empty_zero_page, 0, PAGE_SIZE); | |
198 | ||
199 | /* this will put all low memory onto the freelists */ | |
200 | for_each_online_node(nid) | |
201 | totalram_pages += free_all_bootmem_node(NODE_DATA(nid)); | |
202 | ||
203 | reservedpages = reservedpages_count() - hole_pages; | |
204 | codesize = (unsigned long) &_etext - (unsigned long)&_text; | |
205 | datasize = (unsigned long) &_edata - (unsigned long)&_etext; | |
206 | initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin; | |
207 | ||
208 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " | |
209 | "%dk reserved, %dk data, %dk init)\n", | |
210 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
211 | num_physpages << (PAGE_SHIFT-10), | |
212 | codesize >> 10, | |
213 | reservedpages << (PAGE_SHIFT-10), | |
214 | datasize >> 10, | |
215 | initsize >> 10); | |
216 | } | |
217 | ||
218 | /*======================================================================* | |
219 | * free_initmem() : | |
220 | * orig : arch/sh/mm/init.c | |
221 | *======================================================================*/ | |
222 | void free_initmem(void) | |
223 | { | |
224 | unsigned long addr; | |
225 | ||
226 | addr = (unsigned long)(&__init_begin); | |
227 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
228 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 229 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
230 | free_page(addr); |
231 | totalram_pages++; | |
232 | } | |
233 | printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \ | |
234 | (int)(&__init_end - &__init_begin) >> 10); | |
235 | } | |
236 | ||
237 | #ifdef CONFIG_BLK_DEV_INITRD | |
238 | /*======================================================================* | |
239 | * free_initrd_mem() : | |
240 | * orig : arch/sh/mm/init.c | |
241 | *======================================================================*/ | |
242 | void free_initrd_mem(unsigned long start, unsigned long end) | |
243 | { | |
244 | unsigned long p; | |
245 | for (p = start; p < end; p += PAGE_SIZE) { | |
246 | ClearPageReserved(virt_to_page(p)); | |
7835e98b | 247 | init_page_count(virt_to_page(p)); |
1da177e4 LT |
248 | free_page(p); |
249 | totalram_pages++; | |
250 | } | |
251 | printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
252 | } | |
253 | #endif |