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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 | ||
66d857b0 | 42 | #ifdef CONFIG_MMU |
dd1cb3a7 GU |
43 | |
44 | pg_data_t pg_data_map[MAX_NUMNODES]; | |
45 | EXPORT_SYMBOL(pg_data_map); | |
46 | ||
47 | int m68k_virt_to_node_shift; | |
48 | ||
49 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
50 | pg_data_t *pg_data_table[65]; | |
51 | EXPORT_SYMBOL(pg_data_table); | |
52 | #endif | |
53 | ||
54 | void __init m68k_setup_node(int node) | |
55 | { | |
56 | #ifndef CONFIG_SINGLE_MEMORY_CHUNK | |
57 | struct mem_info *info = m68k_memory + node; | |
58 | int i, end; | |
59 | ||
60 | i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift(); | |
61 | end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift(); | |
62 | for (; i <= end; i++) { | |
63 | if (pg_data_table[i]) | |
64 | printk("overlap at %u for chunk %u\n", i, node); | |
65 | pg_data_table[i] = pg_data_map + node; | |
66 | } | |
67 | #endif | |
68 | pg_data_map[node].bdata = bootmem_node_data + node; | |
69 | node_set_online(node); | |
70 | } | |
71 | ||
72 | extern void init_pointer_table(unsigned long ptable); | |
73 | extern pmd_t *zero_pgtable; | |
74 | ||
75 | #else /* CONFIG_MMU */ | |
76 | ||
77 | /* | |
78 | * paging_init() continues the virtual memory environment setup which | |
79 | * was begun by the code in arch/head.S. | |
80 | * The parameters are pointers to where to stick the starting and ending | |
81 | * addresses of available kernel virtual memory. | |
82 | */ | |
83 | void __init paging_init(void) | |
84 | { | |
85 | /* | |
86 | * Make sure start_mem is page aligned, otherwise bootmem and | |
87 | * page_alloc get different views of the world. | |
88 | */ | |
89 | unsigned long end_mem = memory_end & PAGE_MASK; | |
90 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
91 | ||
92 | high_memory = (void *) end_mem; | |
93 | ||
94 | empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); | |
95 | memset(empty_zero_page, 0, PAGE_SIZE); | |
96 | ||
97 | /* | |
98 | * Set up SFC/DFC registers (user data space). | |
99 | */ | |
100 | set_fs (USER_DS); | |
101 | ||
102 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; | |
103 | free_area_init(zones_size); | |
104 | } | |
105 | ||
106 | void free_initmem(void) | |
107 | { | |
108 | #ifdef CONFIG_RAMKERNEL | |
109 | unsigned long addr; | |
110 | ||
111 | /* | |
112 | * The following code should be cool even if these sections | |
113 | * are not page aligned. | |
114 | */ | |
115 | addr = PAGE_ALIGN((unsigned long) __init_begin); | |
116 | /* next to check that the page we free is not a partial page */ | |
117 | for (; addr + PAGE_SIZE < ((unsigned long) __init_end); addr += PAGE_SIZE) { | |
118 | ClearPageReserved(virt_to_page(addr)); | |
119 | init_page_count(virt_to_page(addr)); | |
120 | free_page(addr); | |
121 | totalram_pages++; | |
122 | } | |
123 | pr_notice("Freeing unused kernel memory: %luk freed (0x%x - 0x%x)\n", | |
124 | (addr - PAGE_ALIGN((unsigned long) __init_begin)) >> 10, | |
125 | (int)(PAGE_ALIGN((unsigned long) __init_begin)), | |
126 | (int)(addr - PAGE_SIZE)); | |
127 | #endif | |
128 | } | |
129 | ||
130 | #endif /* CONFIG_MMU */ | |
131 | ||
132 | #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) | |
133 | #define VECTORS &vectors[0] | |
66d857b0 | 134 | #else |
dd1cb3a7 GU |
135 | #define VECTORS _ramvec |
136 | #endif | |
137 | ||
138 | void __init print_memmap(void) | |
139 | { | |
140 | #define UL(x) ((unsigned long) (x)) | |
141 | #define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10 | |
142 | #define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20 | |
143 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024) | |
144 | ||
145 | pr_notice("Virtual kernel memory layout:\n" | |
146 | " vector : 0x%08lx - 0x%08lx (%4ld KiB)\n" | |
147 | " kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
148 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
149 | " lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n" | |
150 | " .init : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
151 | " .text : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
152 | " .data : 0x%p" " - 0x%p" " (%4d KiB)\n" | |
153 | " .bss : 0x%p" " - 0x%p" " (%4d KiB)\n", | |
154 | MLK(VECTORS, VECTORS + 256), | |
155 | MLM(KMAP_START, KMAP_END), | |
156 | MLM(VMALLOC_START, VMALLOC_END), | |
157 | MLM(PAGE_OFFSET, (unsigned long)high_memory), | |
158 | MLK_ROUNDUP(__init_begin, __init_end), | |
159 | MLK_ROUNDUP(_stext, _etext), | |
160 | MLK_ROUNDUP(_sdata, _edata), | |
161 | MLK_ROUNDUP(__bss_start, __bss_stop)); | |
162 | } | |
163 | ||
164 | void __init mem_init(void) | |
165 | { | |
166 | pg_data_t *pgdat; | |
167 | int codepages = 0; | |
168 | int datapages = 0; | |
169 | int initpages = 0; | |
170 | int i; | |
171 | ||
172 | /* this will put all memory onto the freelists */ | |
173 | totalram_pages = num_physpages = 0; | |
174 | for_each_online_pgdat(pgdat) { | |
175 | num_physpages += pgdat->node_present_pages; | |
176 | ||
177 | totalram_pages += free_all_bootmem_node(pgdat); | |
178 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
179 | struct page *page = pgdat->node_mem_map + i; | |
180 | char *addr = page_to_virt(page); | |
181 | ||
182 | if (!PageReserved(page)) | |
183 | continue; | |
184 | if (addr >= _text && | |
185 | addr < _etext) | |
186 | codepages++; | |
187 | else if (addr >= __init_begin && | |
188 | addr < __init_end) | |
189 | initpages++; | |
190 | else | |
191 | datapages++; | |
192 | } | |
193 | } | |
194 | ||
195 | #if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) | |
196 | /* insert pointer tables allocated so far into the tablelist */ | |
197 | init_pointer_table((unsigned long)kernel_pg_dir); | |
198 | for (i = 0; i < PTRS_PER_PGD; i++) { | |
199 | if (pgd_present(kernel_pg_dir[i])) | |
200 | init_pointer_table(__pgd_page(kernel_pg_dir[i])); | |
201 | } | |
202 | ||
203 | /* insert also pointer table that we used to unmap the zero page */ | |
204 | if (zero_pgtable) | |
205 | init_pointer_table((unsigned long)zero_pgtable); | |
206 | #endif | |
207 | ||
208 | pr_info("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n", | |
209 | nr_free_pages() << (PAGE_SHIFT-10), | |
210 | totalram_pages << (PAGE_SHIFT-10), | |
211 | codepages << (PAGE_SHIFT-10), | |
212 | datapages << (PAGE_SHIFT-10), | |
213 | initpages << (PAGE_SHIFT-10)); | |
214 | print_memmap(); | |
215 | } | |
216 | ||
217 | #ifdef CONFIG_BLK_DEV_INITRD | |
218 | void free_initrd_mem(unsigned long start, unsigned long end) | |
219 | { | |
220 | int pages = 0; | |
221 | for (; start < end; start += PAGE_SIZE) { | |
222 | ClearPageReserved(virt_to_page(start)); | |
223 | init_page_count(virt_to_page(start)); | |
224 | free_page(start); | |
225 | totalram_pages++; | |
226 | pages++; | |
227 | } | |
228 | pr_notice("Freeing initrd memory: %dk freed\n", | |
229 | pages << (PAGE_SHIFT - 10)); | |
230 | } | |
1da177e4 | 231 | #endif |