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 | ||
1da177e4 LT |
39 | /* |
40 | * Cache of MMU context last used. | |
41 | */ | |
42 | #ifndef CONFIG_SMP | |
43 | unsigned long mmu_context_cache_dat; | |
44 | #else | |
45 | unsigned long mmu_context_cache_dat[NR_CPUS]; | |
46 | #endif | |
47 | static unsigned long hole_pages; | |
48 | ||
49 | /* | |
50 | * function prototype | |
51 | */ | |
52 | void __init paging_init(void); | |
53 | void __init mem_init(void); | |
54 | void free_initmem(void); | |
55 | #ifdef CONFIG_BLK_DEV_INITRD | |
56 | void free_initrd_mem(unsigned long, unsigned long); | |
57 | #endif | |
58 | ||
59 | /* It'd be good if these lines were in the standard header file. */ | |
3560e249 | 60 | #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn) |
1da177e4 LT |
61 | #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn) |
62 | ||
63 | #ifndef CONFIG_DISCONTIGMEM | |
64 | unsigned long __init zone_sizes_init(void) | |
65 | { | |
f06a9684 | 66 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 LT |
67 | unsigned long max_dma; |
68 | unsigned long low; | |
69 | unsigned long start_pfn; | |
70 | ||
71 | #ifdef CONFIG_MMU | |
72 | start_pfn = START_PFN(0); | |
73 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
74 | low = MAX_LOW_PFN(0); | |
75 | ||
76 | if (low < max_dma){ | |
77 | zones_size[ZONE_DMA] = low - start_pfn; | |
78 | zones_size[ZONE_NORMAL] = 0; | |
79 | } else { | |
80 | zones_size[ZONE_DMA] = low - start_pfn; | |
81 | zones_size[ZONE_NORMAL] = low - max_dma; | |
82 | } | |
83 | #else | |
84 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
85 | zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; | |
86 | start_pfn = __MEMORY_START >> PAGE_SHIFT; | |
87 | #endif /* CONFIG_MMU */ | |
88 | ||
9109fb7b | 89 | free_area_init_node(0, zones_size, start_pfn, 0); |
1da177e4 LT |
90 | |
91 | return 0; | |
92 | } | |
93 | #else /* CONFIG_DISCONTIGMEM */ | |
94 | extern unsigned long zone_sizes_init(void); | |
95 | #endif /* CONFIG_DISCONTIGMEM */ | |
96 | ||
97 | /*======================================================================* | |
98 | * paging_init() : sets up the page tables | |
99 | *======================================================================*/ | |
100 | void __init paging_init(void) | |
101 | { | |
102 | #ifdef CONFIG_MMU | |
103 | int i; | |
104 | pgd_t *pg_dir; | |
105 | ||
106 | /* We don't need kernel mapping as hardware support that. */ | |
107 | pg_dir = swapper_pg_dir; | |
108 | ||
109 | for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++) | |
110 | pgd_val(pg_dir[i]) = 0; | |
111 | #endif /* CONFIG_MMU */ | |
112 | hole_pages = zone_sizes_init(); | |
113 | } | |
114 | ||
115 | int __init reservedpages_count(void) | |
116 | { | |
117 | int reservedpages, nid, i; | |
118 | ||
119 | reservedpages = 0; | |
208d54e5 DH |
120 | for_each_online_node(nid) { |
121 | unsigned long flags; | |
122 | pgdat_resize_lock(NODE_DATA(nid), &flags); | |
1da177e4 | 123 | for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++) |
408fde81 | 124 | if (PageReserved(nid_page_nr(nid, i))) |
1da177e4 | 125 | reservedpages++; |
208d54e5 DH |
126 | pgdat_resize_unlock(NODE_DATA(nid), &flags); |
127 | } | |
1da177e4 LT |
128 | |
129 | return reservedpages; | |
130 | } | |
131 | ||
132 | /*======================================================================* | |
133 | * mem_init() : | |
134 | * orig : arch/sh/mm/init.c | |
135 | *======================================================================*/ | |
136 | void __init mem_init(void) | |
137 | { | |
138 | int codesize, reservedpages, datasize, initsize; | |
139 | int nid; | |
140 | #ifndef CONFIG_MMU | |
141 | extern unsigned long memory_end; | |
142 | #endif | |
143 | ||
144 | num_physpages = 0; | |
145 | for_each_online_node(nid) | |
146 | num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1; | |
147 | ||
148 | num_physpages -= hole_pages; | |
149 | ||
150 | #ifndef CONFIG_DISCONTIGMEM | |
151 | max_mapnr = num_physpages; | |
152 | #endif /* CONFIG_DISCONTIGMEM */ | |
153 | ||
154 | #ifdef CONFIG_MMU | |
155 | high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); | |
156 | #else | |
157 | high_memory = (void *)(memory_end & PAGE_MASK); | |
158 | #endif /* CONFIG_MMU */ | |
159 | ||
160 | /* clear the zero-page */ | |
161 | memset(empty_zero_page, 0, PAGE_SIZE); | |
162 | ||
163 | /* this will put all low memory onto the freelists */ | |
164 | for_each_online_node(nid) | |
165 | totalram_pages += free_all_bootmem_node(NODE_DATA(nid)); | |
166 | ||
167 | reservedpages = reservedpages_count() - hole_pages; | |
168 | codesize = (unsigned long) &_etext - (unsigned long)&_text; | |
169 | datasize = (unsigned long) &_edata - (unsigned long)&_etext; | |
170 | initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin; | |
171 | ||
172 | printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " | |
173 | "%dk reserved, %dk data, %dk init)\n", | |
cc013a88 | 174 | nr_free_pages() << (PAGE_SHIFT-10), |
1da177e4 LT |
175 | num_physpages << (PAGE_SHIFT-10), |
176 | codesize >> 10, | |
177 | reservedpages << (PAGE_SHIFT-10), | |
178 | datasize >> 10, | |
179 | initsize >> 10); | |
180 | } | |
181 | ||
182 | /*======================================================================* | |
183 | * free_initmem() : | |
184 | * orig : arch/sh/mm/init.c | |
185 | *======================================================================*/ | |
186 | void free_initmem(void) | |
187 | { | |
188 | unsigned long addr; | |
189 | ||
190 | addr = (unsigned long)(&__init_begin); | |
191 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
192 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 193 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
194 | free_page(addr); |
195 | totalram_pages++; | |
196 | } | |
197 | printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \ | |
198 | (int)(&__init_end - &__init_begin) >> 10); | |
199 | } | |
200 | ||
201 | #ifdef CONFIG_BLK_DEV_INITRD | |
202 | /*======================================================================* | |
203 | * free_initrd_mem() : | |
204 | * orig : arch/sh/mm/init.c | |
205 | *======================================================================*/ | |
206 | void free_initrd_mem(unsigned long start, unsigned long end) | |
207 | { | |
208 | unsigned long p; | |
209 | for (p = start; p < end; p += PAGE_SIZE) { | |
210 | ClearPageReserved(virt_to_page(p)); | |
7835e98b | 211 | init_page_count(virt_to_page(p)); |
1da177e4 LT |
212 | free_page(p); |
213 | totalram_pages++; | |
214 | } | |
215 | printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
216 | } | |
217 | #endif |