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dd1cb3a7 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/traps.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 | /* | |
36 | * ZERO_PAGE is a special page that is used for zero-initialized | |
37 | * data and COW. | |
38 | */ | |
39 | void *empty_zero_page; | |
40 | EXPORT_SYMBOL(empty_zero_page); | |
41 | ||
d6fccc75 GU |
42 | #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) |
43 | extern void init_pointer_table(unsigned long ptable); | |
44 | extern pmd_t *zero_pgtable; | |
45 | #endif | |
46 | ||
66d857b0 | 47 | #ifdef CONFIG_MMU |
dd1cb3a7 GU |
48 | |
49 | pg_data_t pg_data_map[MAX_NUMNODES]; | |
50 | EXPORT_SYMBOL(pg_data_map); | |
51 | ||
52 | int m68k_virt_to_node_shift; | |
53 | ||
54 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
55 | pg_data_t *pg_data_table[65]; | |
56 | EXPORT_SYMBOL(pg_data_table); | |
57 | #endif | |
58 | ||
59 | void __init m68k_setup_node(int node) | |
60 | { | |
61 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
62 | struct mem_info *info = m68k_memory + node; | |
63 | int i, end; | |
64 | ||
65 | i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); | |
66 | end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); | |
67 | for (; i <= end; i++) { | |
68 | if (pg_data_table[i]) | |
69 | printk("overlap at %u for chunk %u\n", i, node); | |
70 | pg_data_table[i] = pg_data_map + node; | |
71 | } | |
72 | #endif | |
73 | pg_data_map[node].bdata = bootmem_node_data + node; | |
74 | node_set_online(node); | |
75 | } | |
76 | ||
dd1cb3a7 GU |
77 | #else /* CONFIG_MMU */ |
78 | ||
79 | /* | |
80 | * paging_init() continues the virtual memory environment setup which | |
81 | * was begun by the code in arch/head.S. | |
82 | * The parameters are pointers to where to stick the starting and ending | |
83 | * addresses of available kernel virtual memory. | |
84 | */ | |
85 | void __init paging_init(void) | |
86 | { | |
87 | /* | |
88 | * Make sure start_mem is page aligned, otherwise bootmem and | |
89 | * page_alloc get different views of the world. | |
90 | */ | |
91 | unsigned long end_mem = memory_end & PAGE_MASK; | |
92 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
93 | ||
94 | high_memory = (void *) end_mem; | |
95 | ||
96 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
97 | memset(empty_zero_page, 0, PAGE_SIZE); | |
98 | ||
99 | /* | |
100 | * Set up SFC/DFC registers (user data space). | |
101 | */ | |
102 | set_fs (USER_DS); | |
103 | ||
104 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
105 | free_area_init(zones_size); | |
106 | } | |
107 | ||
f50bf88d GU |
108 | #endif /* CONFIG_MMU */ |
109 | ||
dd1cb3a7 GU |
110 | void free_initmem(void) |
111 | { | |
f50bf88d | 112 | #ifndef CONFIG_MMU_SUN3 |
dd1cb3a7 GU |
113 | unsigned long addr; |
114 | ||
f50bf88d GU |
115 | addr = (unsigned long) __init_begin; |
116 | for (; addr < ((unsigned long) __init_end); addr += PAGE_SIZE) { | |
dd1cb3a7 GU |
117 | ClearPageReserved(virt_to_page(addr)); |
118 | init_page_count(virt_to_page(addr)); | |
119 | free_page(addr); | |
120 | totalram_pages++; | |
121 | } | |
122 | pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n", | |
f50bf88d GU |
123 | (addr - (unsigned long) __init_begin) >> 10, |
124 | (unsigned int) __init_begin, (unsigned int) __init_end); | |
125 | #endif /* CONFIG_MMU_SUN3 */ | |
dd1cb3a7 GU |
126 | } |
127 | ||
dd1cb3a7 GU |
128 | #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) |
129 | #define VECTORS &vectors[0] | |
66d857b0 | 130 | #else |
dd1cb3a7 GU |
131 | #define VECTORS _ramvec |
132 | #endif | |
133 | ||
134 | void __init print_memmap(void) | |
135 | { | |
136 | #define UL(x) ((unsigned long) (x)) | |
137 | #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10 | |
138 | #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20 | |
139 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024) | |
140 | ||
141 | pr_notice("Virtual kernel memory layout:\n" | |
142 | " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n" | |
143 | " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
144 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
145 | " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
146 | " .init : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
147 | " .text : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
148 | " .data : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
149 | " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n", | |
150 | MLK(VECTORS, VECTORS + 256), | |
151 | MLM(KMAP_START, KMAP_END), | |
152 | MLM(VMALLOC_START, VMALLOC_END), | |
153 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
154 | MLK_ROUNDUP(__init_begin, __init_end), | |
155 | MLK_ROUNDUP(_stext, _etext), | |
156 | MLK_ROUNDUP(_sdata, _edata), | |
157 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
158 | } | |
159 | ||
160 | void __init mem_init(void) | |
161 | { | |
162 | pg_data_t *pgdat; | |
163 | int codepages = 0; | |
164 | int datapages = 0; | |
165 | int initpages = 0; | |
166 | int i; | |
167 | ||
168 | /* this will put all memory onto the freelists */ | |
169 | totalram_pages = num_physpages = 0; | |
170 | for_each_online_pgdat(pgdat) { | |
171 | num_physpages += pgdat->node_present_pages; | |
172 | ||
173 | totalram_pages += free_all_bootmem_node(pgdat); | |
174 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
175 | struct page *page = pgdat->node_mem_map + i; | |
176 | char *addr = page_to_virt(page); | |
177 | ||
178 | if (!PageReserved(page)) | |
179 | continue; | |
180 | if (addr >= _text && | |
181 | addr < _etext) | |
182 | codepages++; | |
183 | else if (addr >= __init_begin && | |
184 | addr < __init_end) | |
185 | initpages++; | |
186 | else | |
187 | datapages++; | |
188 | } | |
189 | } | |
190 | ||
191 | #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) | |
192 | /* insert pointer tables allocated so far into the tablelist */ | |
193 | init_pointer_table((unsigned long)kernel_pg_dir); | |
194 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
195 | if (pgd_present(kernel_pg_dir[i])) | |
196 | init_pointer_table(__pgd_page(kernel_pg_dir[i])); | |
197 | } | |
198 | ||
199 | /* insert also pointer table that we used to unmap the zero page */ | |
200 | if (zero_pgtable) | |
201 | init_pointer_table((unsigned long)zero_pgtable); | |
202 | #endif | |
203 | ||
204 | pr_info("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", | |
205 | nr_free_pages() << (PAGE_SHIFT-10), | |
206 | totalram_pages << (PAGE_SHIFT-10), | |
207 | codepages << (PAGE_SHIFT-10), | |
208 | datapages << (PAGE_SHIFT-10), | |
209 | initpages << (PAGE_SHIFT-10)); | |
210 | print_memmap(); | |
211 | } | |
212 | ||
213 | #ifdef CONFIG_BLK_DEV_INITRD | |
214 | void free_initrd_mem(unsigned long start, unsigned long end) | |
215 | { | |
216 | int pages = 0; | |
217 | for (; start < end; start += PAGE_SIZE) { | |
218 | ClearPageReserved(virt_to_page(start)); | |
219 | init_page_count(virt_to_page(start)); | |
220 | free_page(start); | |
221 | totalram_pages++; | |
222 | pages++; | |
223 | } | |
224 | pr_notice("Freeing initrd memory: %dk freed\n", | |
225 | pages << (PAGE_SHIFT - 10)); | |
226 | } | |
1da177e4 | 227 | #endif |