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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * arch/sh64/mm/init.c | |
7 | * | |
8 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
9 | * Copyright (C) 2003, 2004 Paul Mundt | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/rwsem.h> | |
15 | #include <linux/mm.h> | |
16 | #include <linux/swap.h> | |
17 | #include <linux/bootmem.h> | |
18 | ||
19 | #include <asm/mmu_context.h> | |
20 | #include <asm/page.h> | |
21 | #include <asm/pgalloc.h> | |
22 | #include <asm/pgtable.h> | |
23 | #include <asm/tlb.h> | |
24 | ||
25 | #ifdef CONFIG_BLK_DEV_INITRD | |
26 | #include <linux/blk.h> | |
27 | #endif | |
28 | ||
29 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
30 | ||
31 | /* | |
32 | * Cache of MMU context last used. | |
33 | */ | |
34 | unsigned long mmu_context_cache; | |
35 | pgd_t * mmu_pdtp_cache; | |
36 | int after_bootmem = 0; | |
37 | ||
38 | /* | |
39 | * BAD_PAGE is the page that is used for page faults when linux | |
40 | * is out-of-memory. Older versions of linux just did a | |
41 | * do_exit(), but using this instead means there is less risk | |
42 | * for a process dying in kernel mode, possibly leaving an inode | |
43 | * unused etc.. | |
44 | * | |
45 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
46 | * to point to BAD_PAGE entries. | |
47 | * | |
48 | * ZERO_PAGE is a special page that is used for zero-initialized | |
49 | * data and COW. | |
50 | */ | |
51 | ||
52 | extern unsigned char empty_zero_page[PAGE_SIZE]; | |
53 | extern unsigned char empty_bad_page[PAGE_SIZE]; | |
54 | extern pte_t empty_bad_pte_table[PTRS_PER_PTE]; | |
55 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
56 | ||
57 | extern char _text, _etext, _edata, __bss_start, _end; | |
58 | extern char __init_begin, __init_end; | |
59 | ||
60 | /* It'd be good if these lines were in the standard header file. */ | |
61 | #define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT) | |
62 | #define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn) | |
63 | ||
64 | ||
65 | void show_mem(void) | |
66 | { | |
67 | int i, total = 0, reserved = 0; | |
68 | int shared = 0, cached = 0; | |
69 | ||
70 | printk("Mem-info:\n"); | |
71 | show_free_areas(); | |
72 | printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10)); | |
73 | i = max_mapnr; | |
74 | while (i-- > 0) { | |
75 | total++; | |
76 | if (PageReserved(mem_map+i)) | |
77 | reserved++; | |
78 | else if (PageSwapCache(mem_map+i)) | |
79 | cached++; | |
80 | else if (page_count(mem_map+i)) | |
81 | shared += page_count(mem_map+i) - 1; | |
82 | } | |
83 | printk("%d pages of RAM\n",total); | |
84 | printk("%d reserved pages\n",reserved); | |
85 | printk("%d pages shared\n",shared); | |
86 | printk("%d pages swap cached\n",cached); | |
87 | printk("%ld pages in page table cache\n",pgtable_cache_size); | |
88 | } | |
89 | ||
90 | /* | |
91 | * paging_init() sets up the page tables. | |
92 | * | |
93 | * head.S already did a lot to set up address translation for the kernel. | |
94 | * Here we comes with: | |
95 | * . MMU enabled | |
96 | * . ASID set (SR) | |
97 | * . some 512MB regions being mapped of which the most relevant here is: | |
98 | * . CACHED segment (ASID 0 [irrelevant], shared AND NOT user) | |
99 | * . possible variable length regions being mapped as: | |
100 | * . UNCACHED segment (ASID 0 [irrelevant], shared AND NOT user) | |
101 | * . All of the memory regions are placed, independently from the platform | |
102 | * on high addresses, above 0x80000000. | |
103 | * . swapper_pg_dir is already cleared out by the .space directive | |
104 | * in any case swapper does not require a real page directory since | |
105 | * it's all kernel contained. | |
106 | * | |
107 | * Those pesky NULL-reference errors in the kernel are then | |
108 | * dealt with by not mapping address 0x00000000 at all. | |
109 | * | |
110 | */ | |
111 | void __init paging_init(void) | |
112 | { | |
113 | unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; | |
114 | ||
115 | pgd_init((unsigned long)swapper_pg_dir); | |
116 | pgd_init((unsigned long)swapper_pg_dir + | |
117 | sizeof(pgd_t) * USER_PTRS_PER_PGD); | |
118 | ||
119 | mmu_context_cache = MMU_CONTEXT_FIRST_VERSION; | |
120 | ||
121 | /* | |
122 | * All memory is good as ZONE_NORMAL (fall-through) and ZONE_DMA. | |
123 | */ | |
124 | zones_size[ZONE_DMA] = MAX_LOW_PFN - START_PFN; | |
125 | NODE_DATA(0)->node_mem_map = NULL; | |
126 | free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0); | |
127 | } | |
128 | ||
129 | void __init mem_init(void) | |
130 | { | |
131 | int codesize, reservedpages, datasize, initsize; | |
132 | int tmp; | |
133 | ||
134 | max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN; | |
135 | high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE); | |
136 | ||
137 | /* | |
138 | * Clear the zero-page. | |
139 | * This is not required but we might want to re-use | |
140 | * this very page to pass boot parameters, one day. | |
141 | */ | |
142 | memset(empty_zero_page, 0, PAGE_SIZE); | |
143 | ||
144 | /* this will put all low memory onto the freelists */ | |
145 | totalram_pages += free_all_bootmem_node(NODE_DATA(0)); | |
146 | reservedpages = 0; | |
147 | for (tmp = 0; tmp < num_physpages; tmp++) | |
148 | /* | |
149 | * Only count reserved RAM pages | |
150 | */ | |
151 | if (PageReserved(mem_map+tmp)) | |
152 | reservedpages++; | |
153 | ||
154 | after_bootmem = 1; | |
155 | ||
156 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
157 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
158 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
159 | ||
160 | printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", | |
161 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
162 | max_mapnr << (PAGE_SHIFT-10), | |
163 | codesize >> 10, | |
164 | reservedpages << (PAGE_SHIFT-10), | |
165 | datasize >> 10, | |
166 | initsize >> 10); | |
167 | } | |
168 | ||
169 | void free_initmem(void) | |
170 | { | |
171 | unsigned long addr; | |
172 | ||
173 | addr = (unsigned long)(&__init_begin); | |
174 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
175 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 176 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
177 | free_page(addr); |
178 | totalram_pages++; | |
179 | } | |
180 | printk ("Freeing unused kernel memory: %ldk freed\n", (&__init_end - &__init_begin) >> 10); | |
181 | } | |
182 | ||
183 | #ifdef CONFIG_BLK_DEV_INITRD | |
184 | void free_initrd_mem(unsigned long start, unsigned long end) | |
185 | { | |
186 | unsigned long p; | |
187 | for (p = start; p < end; p += PAGE_SIZE) { | |
188 | ClearPageReserved(virt_to_page(p)); | |
7835e98b | 189 | init_page_count(virt_to_page(p)); |
1da177e4 LT |
190 | free_page(p); |
191 | totalram_pages++; | |
192 | } | |
193 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
194 | } | |
195 | #endif | |
196 |