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66d857b0 GU |
1 | /* |
2 | * linux/arch/m68k/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995 Hamish Macdonald | |
5 | * | |
6 | * Contains common initialization routines, specific init code moved | |
7 | * to motorola.c and sun3mmu.c | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/mm.h> | |
14 | #include <linux/swap.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/bootmem.h> | |
20 | #include <linux/gfp.h> | |
21 | ||
22 | #include <asm/setup.h> | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/pgalloc.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/machdep.h> | |
28 | #include <asm/io.h> | |
29 | #ifdef CONFIG_ATARI | |
30 | #include <asm/atari_stram.h> | |
31 | #endif | |
32 | #include <asm/sections.h> | |
33 | #include <asm/tlb.h> | |
34 | ||
35 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
36 | ||
37 | pg_data_t pg_data_map[MAX_NUMNODES]; | |
38 | EXPORT_SYMBOL(pg_data_map); | |
39 | ||
40 | int m68k_virt_to_node_shift; | |
41 | ||
42 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
43 | pg_data_t *pg_data_table[65]; | |
44 | EXPORT_SYMBOL(pg_data_table); | |
45 | #endif | |
46 | ||
47 | void __init m68k_setup_node(int node) | |
48 | { | |
49 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
50 | struct mem_info *info = m68k_memory + node; | |
51 | int i, end; | |
52 | ||
53 | i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); | |
54 | end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); | |
55 | for (; i <= end; i++) { | |
56 | if (pg_data_table[i]) | |
57 | printk("overlap at %u for chunk %u\n", i, node); | |
58 | pg_data_table[i] = pg_data_map + node; | |
59 | } | |
60 | #endif | |
61 | pg_data_map[node].bdata = bootmem_node_data + node; | |
62 | node_set_online(node); | |
63 | } | |
64 | ||
65 | ||
66 | /* | |
67 | * ZERO_PAGE is a special page that is used for zero-initialized | |
68 | * data and COW. | |
69 | */ | |
70 | ||
71 | void *empty_zero_page; | |
72 | EXPORT_SYMBOL(empty_zero_page); | |
73 | ||
74 | extern void init_pointer_table(unsigned long ptable); | |
75 | ||
76 | /* References to section boundaries */ | |
77 | ||
78 | extern pmd_t *zero_pgtable; | |
79 | ||
80 | void __init mem_init(void) | |
81 | { | |
82 | pg_data_t *pgdat; | |
83 | int codepages = 0; | |
84 | int datapages = 0; | |
85 | int initpages = 0; | |
86 | int i; | |
87 | ||
88 | #ifdef CONFIG_ATARI | |
89 | if (MACH_IS_ATARI) | |
90 | atari_stram_mem_init_hook(); | |
91 | #endif | |
92 | ||
93 | /* this will put all memory onto the freelists */ | |
94 | totalram_pages = num_physpages = 0; | |
95 | for_each_online_pgdat(pgdat) { | |
96 | num_physpages += pgdat->node_present_pages; | |
97 | ||
98 | totalram_pages += free_all_bootmem_node(pgdat); | |
99 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
100 | struct page *page = pgdat->node_mem_map + i; | |
101 | char *addr = page_to_virt(page); | |
102 | ||
103 | if (!PageReserved(page)) | |
104 | continue; | |
105 | if (addr >= _text && | |
106 | addr < _etext) | |
107 | codepages++; | |
108 | else if (addr >= __init_begin && | |
109 | addr < __init_end) | |
110 | initpages++; | |
111 | else | |
112 | datapages++; | |
113 | } | |
114 | } | |
115 | ||
116 | #ifndef CONFIG_SUN3 | |
117 | /* insert pointer tables allocated so far into the tablelist */ | |
118 | init_pointer_table((unsigned long)kernel_pg_dir); | |
119 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
120 | if (pgd_present(kernel_pg_dir[i])) | |
121 | init_pointer_table(__pgd_page(kernel_pg_dir[i])); | |
122 | } | |
123 | ||
124 | /* insert also pointer table that we used to unmap the zero page */ | |
125 | if (zero_pgtable) | |
126 | init_pointer_table((unsigned long)zero_pgtable); | |
127 | #endif | |
128 | ||
129 | printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", | |
130 | nr_free_pages() << (PAGE_SHIFT-10), | |
131 | totalram_pages << (PAGE_SHIFT-10), | |
132 | codepages << (PAGE_SHIFT-10), | |
133 | datapages << (PAGE_SHIFT-10), | |
134 | initpages << (PAGE_SHIFT-10)); | |
135 | } | |
136 | ||
137 | #ifdef CONFIG_BLK_DEV_INITRD | |
138 | void free_initrd_mem(unsigned long start, unsigned long end) | |
139 | { | |
140 | int pages = 0; | |
141 | for (; start < end; start += PAGE_SIZE) { | |
142 | ClearPageReserved(virt_to_page(start)); | |
143 | init_page_count(virt_to_page(start)); | |
144 | free_page(start); | |
145 | totalram_pages++; | |
146 | pages++; | |
147 | } | |
148 | printk ("Freeing initrd memory: %dk freed\n", pages); | |
149 | } | |
150 | #endif |