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/traps.h>
28 #include <asm/machdep.h>
29 #include <asm/io.h>
30 #ifdef CONFIG_ATARI
31 #include <asm/atari_stram.h>
32 #endif
33 #include <asm/sections.h>
34 #include <asm/tlb.h>
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 
m68k_setup_node(int node)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 #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
80 #define VECTORS	&vectors[0]
81 #else
82 #define VECTORS	_ramvec
83 #endif
84 
print_memmap(void)85 void __init print_memmap(void)
86 {
87 #define UL(x) ((unsigned long) (x))
88 #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
89 #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
90 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
91 
92 	pr_notice("Virtual kernel memory layout:\n"
93 		"    vector  : 0x%08lx - 0x%08lx   (%4ld KiB)\n"
94 		"    kmap    : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
95 		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
96 		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MiB)\n"
97 		"      .init : 0x%p" " - 0x%p" "   (%4d KiB)\n"
98 		"      .text : 0x%p" " - 0x%p" "   (%4d KiB)\n"
99 		"      .data : 0x%p" " - 0x%p" "   (%4d KiB)\n"
100 		"      .bss  : 0x%p" " - 0x%p" "   (%4d KiB)\n",
101 		MLK(VECTORS, VECTORS + 256),
102 		MLM(KMAP_START, KMAP_END),
103 		MLM(VMALLOC_START, VMALLOC_END),
104 		MLM(PAGE_OFFSET, (unsigned long)high_memory),
105 		MLK_ROUNDUP(__init_begin, __init_end),
106 		MLK_ROUNDUP(_stext, _etext),
107 		MLK_ROUNDUP(_sdata, _edata),
108 		MLK_ROUNDUP(_sbss, _ebss));
109 }
110 
mem_init(void)111 void __init mem_init(void)
112 {
113 	pg_data_t *pgdat;
114 	int codepages = 0;
115 	int datapages = 0;
116 	int initpages = 0;
117 	int i;
118 
119 	/* this will put all memory onto the freelists */
120 	totalram_pages = num_physpages = 0;
121 	for_each_online_pgdat(pgdat) {
122 		num_physpages += pgdat->node_present_pages;
123 
124 		totalram_pages += free_all_bootmem_node(pgdat);
125 		for (i = 0; i < pgdat->node_spanned_pages; i++) {
126 			struct page *page = pgdat->node_mem_map + i;
127 			char *addr = page_to_virt(page);
128 
129 			if (!PageReserved(page))
130 				continue;
131 			if (addr >= _text &&
132 			    addr < _etext)
133 				codepages++;
134 			else if (addr >= __init_begin &&
135 				 addr < __init_end)
136 				initpages++;
137 			else
138 				datapages++;
139 		}
140 	}
141 
142 #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
143 	/* insert pointer tables allocated so far into the tablelist */
144 	init_pointer_table((unsigned long)kernel_pg_dir);
145 	for (i = 0; i < PTRS_PER_PGD; i++) {
146 		if (pgd_present(kernel_pg_dir[i]))
147 			init_pointer_table(__pgd_page(kernel_pg_dir[i]));
148 	}
149 
150 	/* insert also pointer table that we used to unmap the zero page */
151 	if (zero_pgtable)
152 		init_pointer_table((unsigned long)zero_pgtable);
153 #endif
154 
155 	printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
156 	       nr_free_pages() << (PAGE_SHIFT-10),
157 	       totalram_pages << (PAGE_SHIFT-10),
158 	       codepages << (PAGE_SHIFT-10),
159 	       datapages << (PAGE_SHIFT-10),
160 	       initpages << (PAGE_SHIFT-10));
161 	print_memmap();
162 }
163 
164 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)165 void free_initrd_mem(unsigned long start, unsigned long end)
166 {
167 	int pages = 0;
168 	for (; start < end; start += PAGE_SIZE) {
169 		ClearPageReserved(virt_to_page(start));
170 		init_page_count(virt_to_page(start));
171 		free_page(start);
172 		totalram_pages++;
173 		pages++;
174 	}
175 	printk ("Freeing initrd memory: %dk freed\n", pages);
176 }
177 #endif
178