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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> |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
1da177e4 LT |
23 | #include <asm/types.h> |
24 | #include <asm/processor.h> | |
25 | #include <asm/page.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/pgalloc.h> | |
28 | #include <asm/mmu_context.h> | |
29 | #include <asm/setup.h> | |
30 | #include <asm/tlb.h> | |
8be65857 | 31 | #include <asm/sections.h> |
1da177e4 LT |
32 | |
33 | pgd_t swapper_pg_dir[1024]; | |
34 | ||
1da177e4 LT |
35 | /* |
36 | * Cache of MMU context last used. | |
37 | */ | |
38 | #ifndef CONFIG_SMP | |
39 | unsigned long mmu_context_cache_dat; | |
40 | #else | |
41 | unsigned long mmu_context_cache_dat[NR_CPUS]; | |
42 | #endif | |
1da177e4 LT |
43 | |
44 | /* | |
45 | * function prototype | |
46 | */ | |
47 | void __init paging_init(void); | |
48 | void __init mem_init(void); | |
49 | void free_initmem(void); | |
50 | #ifdef CONFIG_BLK_DEV_INITRD | |
51 | void free_initrd_mem(unsigned long, unsigned long); | |
52 | #endif | |
53 | ||
54 | /* It'd be good if these lines were in the standard header file. */ | |
3560e249 | 55 | #define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn) |
1da177e4 LT |
56 | #define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn) |
57 | ||
58 | #ifndef CONFIG_DISCONTIGMEM | |
a0e7b805 | 59 | void __init zone_sizes_init(void) |
1da177e4 | 60 | { |
f06a9684 | 61 | unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
1da177e4 LT |
62 | unsigned long max_dma; |
63 | unsigned long low; | |
64 | unsigned long start_pfn; | |
65 | ||
66 | #ifdef CONFIG_MMU | |
67 | start_pfn = START_PFN(0); | |
68 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
69 | low = MAX_LOW_PFN(0); | |
70 | ||
71 | if (low < max_dma){ | |
72 | zones_size[ZONE_DMA] = low - start_pfn; | |
73 | zones_size[ZONE_NORMAL] = 0; | |
74 | } else { | |
75 | zones_size[ZONE_DMA] = low - start_pfn; | |
76 | zones_size[ZONE_NORMAL] = low - max_dma; | |
77 | } | |
78 | #else | |
79 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
80 | zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; | |
81 | start_pfn = __MEMORY_START >> PAGE_SHIFT; | |
82 | #endif /* CONFIG_MMU */ | |
83 | ||
9109fb7b | 84 | free_area_init_node(0, zones_size, start_pfn, 0); |
1da177e4 LT |
85 | } |
86 | #else /* CONFIG_DISCONTIGMEM */ | |
a0e7b805 | 87 | extern void zone_sizes_init(void); |
1da177e4 LT |
88 | #endif /* CONFIG_DISCONTIGMEM */ |
89 | ||
90 | /*======================================================================* | |
91 | * paging_init() : sets up the page tables | |
92 | *======================================================================*/ | |
93 | void __init paging_init(void) | |
94 | { | |
95 | #ifdef CONFIG_MMU | |
96 | int i; | |
97 | pgd_t *pg_dir; | |
98 | ||
99 | /* We don't need kernel mapping as hardware support that. */ | |
100 | pg_dir = swapper_pg_dir; | |
101 | ||
102 | for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++) | |
103 | pgd_val(pg_dir[i]) = 0; | |
104 | #endif /* CONFIG_MMU */ | |
a0e7b805 | 105 | zone_sizes_init(); |
1da177e4 LT |
106 | } |
107 | ||
108 | /*======================================================================* | |
109 | * mem_init() : | |
110 | * orig : arch/sh/mm/init.c | |
111 | *======================================================================*/ | |
112 | void __init mem_init(void) | |
113 | { | |
1da177e4 LT |
114 | #ifndef CONFIG_MMU |
115 | extern unsigned long memory_end; | |
1da177e4 | 116 | |
1da177e4 | 117 | high_memory = (void *)(memory_end & PAGE_MASK); |
c5c009fb JL |
118 | #else |
119 | high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); | |
1da177e4 LT |
120 | #endif /* CONFIG_MMU */ |
121 | ||
122 | /* clear the zero-page */ | |
123 | memset(empty_zero_page, 0, PAGE_SIZE); | |
124 | ||
c5c009fb JL |
125 | set_max_mapnr(get_num_physpages()); |
126 | free_all_bootmem(); | |
a0e7b805 | 127 | mem_init_print_info(NULL); |
1da177e4 LT |
128 | } |
129 | ||
130 | /*======================================================================* | |
131 | * free_initmem() : | |
132 | * orig : arch/sh/mm/init.c | |
133 | *======================================================================*/ | |
134 | void free_initmem(void) | |
135 | { | |
dbe67df4 | 136 | free_initmem_default(-1); |
1da177e4 LT |
137 | } |
138 | ||
139 | #ifdef CONFIG_BLK_DEV_INITRD | |
140 | /*======================================================================* | |
141 | * free_initrd_mem() : | |
142 | * orig : arch/sh/mm/init.c | |
143 | *======================================================================*/ | |
144 | void free_initrd_mem(unsigned long start, unsigned long end) | |
145 | { | |
dbe67df4 | 146 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
1da177e4 LT |
147 | } |
148 | #endif |