]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $ |
2 | * | |
3 | * linux/arch/sh/mm/init.c | |
4 | * | |
5 | * Copyright (C) 1999 Niibe Yutaka | |
6 | * Copyright (C) 2002, 2004 Paul Mundt | |
7 | * | |
8 | * Based on linux/arch/i386/mm/init.c: | |
9 | * Copyright (C) 1995 Linus Torvalds | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/signal.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/ptrace.h> | |
20 | #include <linux/mman.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/pagemap.h> | |
28 | ||
29 | #include <asm/processor.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/uaccess.h> | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/mmu_context.h> | |
35 | #include <asm/io.h> | |
36 | #include <asm/tlb.h> | |
37 | #include <asm/cacheflush.h> | |
38 | #include <asm/cache.h> | |
39 | ||
40 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
41 | pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
42 | ||
43 | /* | |
44 | * Cache of MMU context last used. | |
45 | */ | |
46 | unsigned long mmu_context_cache = NO_CONTEXT; | |
47 | ||
48 | #ifdef CONFIG_MMU | |
49 | /* It'd be good if these lines were in the standard header file. */ | |
50 | #define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT) | |
51 | #define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn) | |
52 | #endif | |
53 | ||
1da177e4 LT |
54 | void (*copy_page)(void *from, void *to); |
55 | void (*clear_page)(void *to); | |
56 | ||
57 | void show_mem(void) | |
58 | { | |
59 | int i, total = 0, reserved = 0; | |
60 | int shared = 0, cached = 0; | |
61 | ||
62 | printk("Mem-info:\n"); | |
63 | show_free_areas(); | |
64 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
65 | i = max_mapnr; | |
66 | while (i-- > 0) { | |
67 | total++; | |
68 | if (PageReserved(mem_map+i)) | |
69 | reserved++; | |
70 | else if (PageSwapCache(mem_map+i)) | |
71 | cached++; | |
72 | else if (page_count(mem_map+i)) | |
73 | shared += page_count(mem_map+i) - 1; | |
74 | } | |
75 | printk("%d pages of RAM\n",total); | |
76 | printk("%d reserved pages\n",reserved); | |
77 | printk("%d pages shared\n",shared); | |
78 | printk("%d pages swap cached\n",cached); | |
79 | } | |
80 | ||
81 | static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) | |
82 | { | |
83 | pgd_t *pgd; | |
84 | pmd_t *pmd; | |
85 | pte_t *pte; | |
86 | ||
87 | pgd = swapper_pg_dir + pgd_index(addr); | |
88 | if (pgd_none(*pgd)) { | |
89 | pgd_ERROR(*pgd); | |
90 | return; | |
91 | } | |
92 | ||
93 | pmd = pmd_offset(pgd, addr); | |
94 | if (pmd_none(*pmd)) { | |
95 | pte = (pte_t *)get_zeroed_page(GFP_ATOMIC); | |
96 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER)); | |
97 | if (pte != pte_offset_kernel(pmd, 0)) { | |
98 | pmd_ERROR(*pmd); | |
99 | return; | |
100 | } | |
101 | } | |
102 | ||
103 | pte = pte_offset_kernel(pmd, addr); | |
104 | if (!pte_none(*pte)) { | |
105 | pte_ERROR(*pte); | |
106 | return; | |
107 | } | |
108 | ||
109 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); | |
110 | ||
111 | __flush_tlb_page(get_asid(), addr); | |
112 | } | |
113 | ||
114 | /* | |
115 | * As a performance optimization, other platforms preserve the fixmap mapping | |
116 | * across a context switch, we don't presently do this, but this could be done | |
117 | * in a similar fashion as to the wired TLB interface that sh64 uses (by way | |
118 | * of the memorry mapped UTLB configuration) -- this unfortunately forces us to | |
119 | * give up a TLB entry for each mapping we want to preserve. While this may be | |
120 | * viable for a small number of fixmaps, it's not particularly useful for | |
121 | * everything and needs to be carefully evaluated. (ie, we may want this for | |
122 | * the vsyscall page). | |
123 | * | |
124 | * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass | |
125 | * in at __set_fixmap() time to determine the appropriate behavior to follow. | |
126 | * | |
127 | * -- PFM. | |
128 | */ | |
129 | void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) | |
130 | { | |
131 | unsigned long address = __fix_to_virt(idx); | |
132 | ||
133 | if (idx >= __end_of_fixed_addresses) { | |
134 | BUG(); | |
135 | return; | |
136 | } | |
137 | ||
138 | set_pte_phys(address, phys, prot); | |
139 | } | |
140 | ||
141 | /* References to section boundaries */ | |
142 | ||
143 | extern char _text, _etext, _edata, __bss_start, _end; | |
144 | extern char __init_begin, __init_end; | |
145 | ||
146 | /* | |
147 | * paging_init() sets up the page tables | |
148 | * | |
149 | * This routines also unmaps the page at virtual kernel address 0, so | |
150 | * that we can trap those pesky NULL-reference errors in the kernel. | |
151 | */ | |
152 | void __init paging_init(void) | |
153 | { | |
154 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
155 | ||
156 | /* | |
157 | * Setup some defaults for the zone sizes.. these should be safe | |
158 | * regardless of distcontiguous memory or MMU settings. | |
159 | */ | |
160 | zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; | |
161 | zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; | |
162 | #ifdef CONFIG_HIGHMEM | |
163 | zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT; | |
164 | #endif | |
165 | ||
166 | #ifdef CONFIG_MMU | |
167 | /* | |
168 | * If we have an MMU, and want to be using it .. we need to adjust | |
169 | * the zone sizes accordingly, in addition to turning it on. | |
170 | */ | |
171 | { | |
172 | unsigned long max_dma, low, start_pfn; | |
173 | pgd_t *pg_dir; | |
174 | int i; | |
175 | ||
176 | /* We don't need kernel mapping as hardware support that. */ | |
177 | pg_dir = swapper_pg_dir; | |
178 | ||
179 | for (i = 0; i < PTRS_PER_PGD; i++) | |
180 | pgd_val(pg_dir[i]) = 0; | |
181 | ||
182 | /* Turn on the MMU */ | |
183 | enable_mmu(); | |
184 | ||
185 | /* Fixup the zone sizes */ | |
186 | start_pfn = START_PFN; | |
187 | max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
188 | low = MAX_LOW_PFN; | |
189 | ||
190 | if (low < max_dma) { | |
191 | zones_size[ZONE_DMA] = low - start_pfn; | |
192 | zones_size[ZONE_NORMAL] = 0; | |
193 | } else { | |
194 | zones_size[ZONE_DMA] = max_dma - start_pfn; | |
195 | zones_size[ZONE_NORMAL] = low - max_dma; | |
196 | } | |
197 | } | |
198 | ||
199 | #elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4) | |
200 | /* | |
201 | * If we don't have CONFIG_MMU set and the processor in question | |
202 | * still has an MMU, care needs to be taken to make sure it doesn't | |
203 | * stay on.. Since the boot loader could have potentially already | |
204 | * turned it on, and we clearly don't want it, we simply turn it off. | |
205 | * | |
206 | * We don't need to do anything special for the zone sizes, since the | |
207 | * default values that were already configured up above should be | |
208 | * satisfactory. | |
209 | */ | |
210 | disable_mmu(); | |
211 | #endif | |
212 | NODE_DATA(0)->node_mem_map = NULL; | |
213 | free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0); | |
1da177e4 LT |
214 | } |
215 | ||
216 | void __init mem_init(void) | |
217 | { | |
218 | extern unsigned long empty_zero_page[1024]; | |
219 | int codesize, reservedpages, datasize, initsize; | |
220 | int tmp; | |
221 | extern unsigned long memory_start; | |
222 | ||
223 | #ifdef CONFIG_MMU | |
224 | high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE); | |
225 | #else | |
226 | extern unsigned long memory_end; | |
227 | ||
228 | high_memory = (void *)(memory_end & PAGE_MASK); | |
229 | #endif | |
230 | ||
231 | max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start); | |
232 | ||
233 | /* clear the zero-page */ | |
234 | memset(empty_zero_page, 0, PAGE_SIZE); | |
235 | __flush_wback_region(empty_zero_page, PAGE_SIZE); | |
236 | ||
65463b73 | 237 | /* |
1da177e4 LT |
238 | * Setup wrappers for copy/clear_page(), these will get overridden |
239 | * later in the boot process if a better method is available. | |
240 | */ | |
241 | copy_page = copy_page_slow; | |
242 | clear_page = clear_page_slow; | |
243 | ||
244 | /* this will put all low memory onto the freelists */ | |
245 | totalram_pages += free_all_bootmem_node(NODE_DATA(0)); | |
1da177e4 LT |
246 | reservedpages = 0; |
247 | for (tmp = 0; tmp < num_physpages; tmp++) | |
248 | /* | |
249 | * Only count reserved RAM pages | |
250 | */ | |
251 | if (PageReserved(mem_map+tmp)) | |
252 | reservedpages++; | |
253 | ||
254 | codesize = (unsigned long) &_etext - (unsigned long) &_text; | |
255 | datasize = (unsigned long) &_edata - (unsigned long) &_etext; | |
256 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; | |
257 | ||
258 | printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", | |
259 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
260 | max_mapnr << (PAGE_SHIFT-10), | |
261 | codesize >> 10, | |
262 | reservedpages << (PAGE_SHIFT-10), | |
263 | datasize >> 10, | |
264 | initsize >> 10); | |
265 | ||
266 | p3_cache_init(); | |
267 | } | |
268 | ||
269 | void free_initmem(void) | |
270 | { | |
271 | unsigned long addr; | |
65463b73 | 272 | |
1da177e4 LT |
273 | addr = (unsigned long)(&__init_begin); |
274 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
275 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 276 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
277 | free_page(addr); |
278 | totalram_pages++; | |
279 | } | |
280 | printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10); | |
281 | } | |
282 | ||
283 | #ifdef CONFIG_BLK_DEV_INITRD | |
284 | void free_initrd_mem(unsigned long start, unsigned long end) | |
285 | { | |
286 | unsigned long p; | |
287 | for (p = start; p < end; p += PAGE_SIZE) { | |
288 | ClearPageReserved(virt_to_page(p)); | |
7835e98b | 289 | init_page_count(virt_to_page(p)); |
1da177e4 LT |
290 | free_page(p); |
291 | totalram_pages++; | |
292 | } | |
293 | printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); | |
294 | } | |
295 | #endif | |
296 |