m68k: Kill several external declarations in source files
[linux-3.10.git] / arch / m68k / mm / init.c
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
21 #include <asm/setup.h>
22 #include <asm/uaccess.h>
23 #include <asm/page.h>
24 #include <asm/pgalloc.h>
25 #include <asm/system.h>
26 #include <asm/machdep.h>
27 #include <asm/io.h>
28 #ifdef CONFIG_ATARI
29 #include <asm/atari_stram.h>
30 #endif
31 #include <asm/sections.h>
32 #include <asm/tlb.h>
33
34 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
35
36 pg_data_t pg_data_map[MAX_NUMNODES];
37 EXPORT_SYMBOL(pg_data_map);
38
39 int m68k_virt_to_node_shift;
40
41 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
42 pg_data_t *pg_data_table[65];
43 EXPORT_SYMBOL(pg_data_table);
44 #endif
45
46 void __init m68k_setup_node(int node)
47 {
48 #ifndef CONFIG_SINGLE_MEMORY_CHUNK
49         struct mem_info *info = m68k_memory + node;
50         int i, end;
51
52         i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
53         end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
54         for (; i <= end; i++) {
55                 if (pg_data_table[i])
56                         printk("overlap at %u for chunk %u\n", i, node);
57                 pg_data_table[i] = pg_data_map + node;
58         }
59 #endif
60         pg_data_map[node].bdata = bootmem_node_data + node;
61         node_set_online(node);
62 }
63
64
65 /*
66  * ZERO_PAGE is a special page that is used for zero-initialized
67  * data and COW.
68  */
69
70 void *empty_zero_page;
71 EXPORT_SYMBOL(empty_zero_page);
72
73 extern void init_pointer_table(unsigned long ptable);
74
75 /* References to section boundaries */
76
77 extern pmd_t *zero_pgtable;
78
79 void __init mem_init(void)
80 {
81         pg_data_t *pgdat;
82         int codepages = 0;
83         int datapages = 0;
84         int initpages = 0;
85         int i;
86
87 #ifdef CONFIG_ATARI
88         if (MACH_IS_ATARI)
89                 atari_stram_mem_init_hook();
90 #endif
91
92         /* this will put all memory onto the freelists */
93         totalram_pages = num_physpages = 0;
94         for_each_online_pgdat(pgdat) {
95                 num_physpages += pgdat->node_present_pages;
96
97                 totalram_pages += free_all_bootmem_node(pgdat);
98                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
99                         struct page *page = pgdat->node_mem_map + i;
100                         char *addr = page_to_virt(page);
101
102                         if (!PageReserved(page))
103                                 continue;
104                         if (addr >= _text &&
105                             addr < _etext)
106                                 codepages++;
107                         else if (addr >= __init_begin &&
108                                  addr < __init_end)
109                                 initpages++;
110                         else
111                                 datapages++;
112                 }
113         }
114
115 #ifndef CONFIG_SUN3
116         /* insert pointer tables allocated so far into the tablelist */
117         init_pointer_table((unsigned long)kernel_pg_dir);
118         for (i = 0; i < PTRS_PER_PGD; i++) {
119                 if (pgd_present(kernel_pg_dir[i]))
120                         init_pointer_table(__pgd_page(kernel_pg_dir[i]));
121         }
122
123         /* insert also pointer table that we used to unmap the zero page */
124         if (zero_pgtable)
125                 init_pointer_table((unsigned long)zero_pgtable);
126 #endif
127
128         printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
129                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
130                totalram_pages << (PAGE_SHIFT-10),
131                codepages << (PAGE_SHIFT-10),
132                datapages << (PAGE_SHIFT-10),
133                initpages << (PAGE_SHIFT-10));
134 }
135
136 #ifdef CONFIG_BLK_DEV_INITRD
137 void free_initrd_mem(unsigned long start, unsigned long end)
138 {
139         int pages = 0;
140         for (; start < end; start += PAGE_SIZE) {
141                 ClearPageReserved(virt_to_page(start));
142                 init_page_count(virt_to_page(start));
143                 free_page(start);
144                 totalram_pages++;
145                 pages++;
146         }
147         printk ("Freeing initrd memory: %dk freed\n", pages);
148 }
149 #endif