xref: /linux/arch/m68k/mm/init.c (revision d39d0ed196aa1685bb24771e92f78633c66ac9cb)
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
151