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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm26/mm/init.c | |
3 | * | |
4 | * Copyright (C) 1995-2002 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/config.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/ptrace.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/swap.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/initrd.h> | |
24 | #include <linux/bootmem.h> | |
25 | #include <linux/blkdev.h> | |
26 | ||
27 | #include <asm/segment.h> | |
28 | #include <asm/mach-types.h> | |
29 | #include <asm/dma.h> | |
30 | #include <asm/hardware.h> | |
31 | #include <asm/setup.h> | |
32 | #include <asm/tlb.h> | |
33 | ||
34 | #include <asm/map.h> | |
35 | ||
36 | ||
37 | #define TABLE_SIZE PTRS_PER_PTE * sizeof(pte_t)) | |
38 | ||
39 | struct mmu_gather mmu_gathers[NR_CPUS]; | |
40 | ||
41 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
42 | extern char _stext, _text, _etext, _end, __init_begin, __init_end; | |
43 | #ifdef CONFIG_XIP_KERNEL | |
44 | extern char _endtext, _sdata; | |
45 | #endif | |
46 | extern unsigned long phys_initrd_start; | |
47 | extern unsigned long phys_initrd_size; | |
48 | ||
49 | /* | |
50 | * The sole use of this is to pass memory configuration | |
51 | * data from paging_init to mem_init. | |
52 | */ | |
53 | static struct meminfo meminfo __initdata = { 0, }; | |
54 | ||
55 | /* | |
56 | * empty_zero_page is a special page that is used for | |
57 | * zero-initialized data and COW. | |
58 | */ | |
59 | struct page *empty_zero_page; | |
60 | ||
61 | void show_mem(void) | |
62 | { | |
63 | int free = 0, total = 0, reserved = 0; | |
64 | int shared = 0, cached = 0, slab = 0; | |
65 | struct page *page, *end; | |
66 | ||
67 | printk("Mem-info:\n"); | |
68 | show_free_areas(); | |
69 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
70 | ||
71 | ||
72 | page = NODE_MEM_MAP(0); | |
73 | end = page + NODE_DATA(0)->node_spanned_pages; | |
74 | ||
75 | do { | |
76 | total++; | |
77 | if (PageReserved(page)) | |
78 | reserved++; | |
79 | else if (PageSwapCache(page)) | |
80 | cached++; | |
81 | else if (PageSlab(page)) | |
82 | slab++; | |
83 | else if (!page_count(page)) | |
84 | free++; | |
85 | else | |
86 | shared += page_count(page) - 1; | |
87 | page++; | |
88 | } while (page < end); | |
89 | ||
90 | printk("%d pages of RAM\n", total); | |
91 | printk("%d free pages\n", free); | |
92 | printk("%d reserved pages\n", reserved); | |
93 | printk("%d slab pages\n", slab); | |
94 | printk("%d pages shared\n", shared); | |
95 | printk("%d pages swap cached\n", cached); | |
96 | } | |
97 | ||
98 | struct node_info { | |
99 | unsigned int start; | |
100 | unsigned int end; | |
101 | int bootmap_pages; | |
102 | }; | |
103 | ||
104 | #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) | |
105 | #define PFN_UP(x) (PAGE_ALIGN(x) >> PAGE_SHIFT) | |
106 | #define PFN_SIZE(x) ((x) >> PAGE_SHIFT) | |
107 | #define PFN_RANGE(s,e) PFN_SIZE(PAGE_ALIGN((unsigned long)(e)) - \ | |
108 | (((unsigned long)(s)) & PAGE_MASK)) | |
109 | ||
110 | /* | |
111 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
112 | * over the top of the initrd. Hopefully, this is located towards | |
113 | * the start of a bank, so if we allocate the bootmap bitmap at | |
114 | * the end, we won't clash. | |
115 | */ | |
116 | static unsigned int __init | |
117 | find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages) | |
118 | { | |
119 | unsigned int start_pfn, bootmap_pfn; | |
120 | unsigned int start, end; | |
121 | ||
122 | start_pfn = PFN_UP((unsigned long)&_end); | |
123 | bootmap_pfn = 0; | |
124 | ||
125 | /* ARM26 machines only have one node */ | |
126 | if (mi->bank->node != 0) | |
127 | BUG(); | |
128 | ||
129 | start = PFN_UP(mi->bank->start); | |
130 | end = PFN_DOWN(mi->bank->size + mi->bank->start); | |
131 | ||
132 | if (start < start_pfn) | |
133 | start = start_pfn; | |
134 | ||
135 | if (end <= start) | |
136 | BUG(); | |
137 | ||
138 | if (end - start >= bootmap_pages) | |
139 | bootmap_pfn = start; | |
140 | else | |
141 | BUG(); | |
142 | ||
143 | return bootmap_pfn; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Scan the memory info structure and pull out: | |
148 | * - the end of memory | |
149 | * - the number of nodes | |
150 | * - the pfn range of each node | |
151 | * - the number of bootmem bitmap pages | |
152 | */ | |
153 | static void __init | |
154 | find_memend_and_nodes(struct meminfo *mi, struct node_info *np) | |
155 | { | |
156 | unsigned int memend_pfn = 0; | |
157 | ||
158 | nodes_clear(node_online_map); | |
159 | node_set_online(0); | |
160 | ||
161 | np->bootmap_pages = 0; | |
162 | ||
163 | if (mi->bank->size == 0) { | |
164 | BUG(); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Get the start and end pfns for this bank | |
169 | */ | |
170 | np->start = PFN_UP(mi->bank->start); | |
171 | np->end = PFN_DOWN(mi->bank->start + mi->bank->size); | |
172 | ||
173 | if (memend_pfn < np->end) | |
174 | memend_pfn = np->end; | |
175 | ||
176 | /* | |
177 | * Calculate the number of pages we require to | |
178 | * store the bootmem bitmaps. | |
179 | */ | |
180 | np->bootmap_pages = bootmem_bootmap_pages(np->end - np->start); | |
181 | ||
182 | /* | |
183 | * This doesn't seem to be used by the Linux memory | |
184 | * manager any more. If we can get rid of it, we | |
185 | * also get rid of some of the stuff above as well. | |
186 | */ | |
187 | max_low_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); | |
188 | max_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); | |
189 | mi->end = memend_pfn << PAGE_SHIFT; | |
190 | ||
191 | } | |
192 | ||
193 | /* | |
194 | * Initialise the bootmem allocator for all nodes. This is called | |
195 | * early during the architecture specific initialisation. | |
196 | */ | |
197 | void __init bootmem_init(struct meminfo *mi) | |
198 | { | |
199 | struct node_info node_info; | |
200 | unsigned int bootmap_pfn; | |
201 | pg_data_t *pgdat = NODE_DATA(0); | |
202 | ||
203 | find_memend_and_nodes(mi, &node_info); | |
204 | ||
205 | bootmap_pfn = find_bootmap_pfn(mi, node_info.bootmap_pages); | |
206 | ||
207 | /* | |
208 | * Note that node 0 must always have some pages. | |
209 | */ | |
210 | if (node_info.end == 0) | |
211 | BUG(); | |
212 | ||
213 | /* | |
214 | * Initialise the bootmem allocator. | |
215 | */ | |
216 | init_bootmem_node(pgdat, bootmap_pfn, node_info.start, node_info.end); | |
217 | ||
218 | /* | |
219 | * Register all available RAM in this node with the bootmem allocator. | |
220 | */ | |
221 | free_bootmem_node(pgdat, mi->bank->start, mi->bank->size); | |
222 | ||
223 | /* | |
224 | * Register the kernel text and data with bootmem. | |
225 | * Note: with XIP we dont register .text since | |
226 | * its in ROM. | |
227 | */ | |
228 | #ifdef CONFIG_XIP_KERNEL | |
229 | reserve_bootmem_node(pgdat, __pa(&_sdata), &_end - &_sdata); | |
230 | #else | |
231 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
232 | #endif | |
233 | ||
234 | /* | |
235 | * And don't forget to reserve the allocator bitmap, | |
236 | * which will be freed later. | |
237 | */ | |
238 | reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT, | |
239 | node_info.bootmap_pages << PAGE_SHIFT); | |
240 | ||
241 | /* | |
242 | * These should likewise go elsewhere. They pre-reserve | |
243 | * the screen memory region at the start of main system | |
244 | * memory. FIXME - screen RAM is not 512K! | |
245 | */ | |
246 | reserve_bootmem_node(pgdat, 0x02000000, 0x00080000); | |
247 | ||
248 | #ifdef CONFIG_BLK_DEV_INITRD | |
249 | initrd_start = phys_initrd_start; | |
250 | initrd_end = initrd_start + phys_initrd_size; | |
251 | ||
252 | /* Achimedes machines only have one node, so initrd is in node 0 */ | |
253 | #ifdef CONFIG_XIP_KERNEL | |
254 | /* Only reserve initrd space if it is in RAM */ | |
255 | if(initrd_start && initrd_start < 0x03000000){ | |
256 | #else | |
257 | if(initrd_start){ | |
258 | #endif | |
259 | reserve_bootmem_node(pgdat, __pa(initrd_start), | |
260 | initrd_end - initrd_start); | |
261 | } | |
262 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
263 | ||
264 | ||
265 | } | |
266 | ||
267 | /* | |
268 | * paging_init() sets up the page tables, initialises the zone memory | |
269 | * maps, and sets up the zero page, bad page and bad page tables. | |
270 | */ | |
271 | void __init paging_init(struct meminfo *mi) | |
272 | { | |
273 | void *zero_page; | |
274 | unsigned long zone_size[MAX_NR_ZONES]; | |
275 | unsigned long zhole_size[MAX_NR_ZONES]; | |
276 | struct bootmem_data *bdata; | |
277 | pg_data_t *pgdat; | |
278 | int i; | |
279 | ||
280 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
281 | ||
282 | /* | |
283 | * allocate the zero page. Note that we count on this going ok. | |
284 | */ | |
285 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); | |
286 | ||
287 | /* | |
288 | * initialise the page tables. | |
289 | */ | |
290 | memtable_init(mi); | |
291 | flush_tlb_all(); | |
292 | ||
293 | /* | |
294 | * initialise the zones in node 0 (archimedes have only 1 node) | |
295 | */ | |
296 | ||
297 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
298 | zone_size[i] = 0; | |
299 | zhole_size[i] = 0; | |
300 | } | |
301 | ||
302 | pgdat = NODE_DATA(0); | |
303 | bdata = pgdat->bdata; | |
304 | zone_size[0] = bdata->node_low_pfn - | |
305 | (bdata->node_boot_start >> PAGE_SHIFT); | |
306 | if (!zone_size[0]) | |
307 | BUG(); | |
308 | pgdat->node_mem_map = NULL; | |
309 | free_area_init_node(0, pgdat, zone_size, | |
310 | bdata->node_boot_start >> PAGE_SHIFT, zhole_size); | |
311 | ||
312 | /* | |
313 | * finish off the bad pages once | |
314 | * the mem_map is initialised | |
315 | */ | |
316 | memzero(zero_page, PAGE_SIZE); | |
317 | empty_zero_page = virt_to_page(zero_page); | |
318 | } | |
319 | ||
320 | static inline void free_area(unsigned long addr, unsigned long end, char *s) | |
321 | { | |
322 | unsigned int size = (end - addr) >> 10; | |
323 | ||
324 | for (; addr < end; addr += PAGE_SIZE) { | |
325 | struct page *page = virt_to_page(addr); | |
326 | ClearPageReserved(page); | |
327 | set_page_count(page, 1); | |
328 | free_page(addr); | |
329 | totalram_pages++; | |
330 | } | |
331 | ||
332 | if (size && s) | |
333 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
334 | } | |
335 | ||
336 | /* | |
337 | * mem_init() marks the free areas in the mem_map and tells us how much | |
338 | * memory is free. This is done after various parts of the system have | |
339 | * claimed their memory after the kernel image. | |
340 | */ | |
341 | void __init mem_init(void) | |
342 | { | |
343 | unsigned int codepages, datapages, initpages; | |
344 | pg_data_t *pgdat = NODE_DATA(0); | |
345 | extern int sysctl_overcommit_memory; | |
346 | ||
347 | ||
348 | /* Note: data pages includes BSS */ | |
349 | #ifdef CONFIG_XIP_KERNEL | |
350 | codepages = &_endtext - &_text; | |
351 | datapages = &_end - &_sdata; | |
352 | #else | |
353 | codepages = &_etext - &_text; | |
354 | datapages = &_end - &_etext; | |
355 | #endif | |
356 | initpages = &__init_end - &__init_begin; | |
357 | ||
358 | high_memory = (void *)__va(meminfo.end); | |
359 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
360 | ||
361 | /* this will put all unused low memory onto the freelists */ | |
362 | if (pgdat->node_spanned_pages != 0) | |
363 | totalram_pages += free_all_bootmem_node(pgdat); | |
364 | ||
365 | num_physpages = meminfo.bank[0].size >> PAGE_SHIFT; | |
366 | ||
367 | printk(KERN_INFO "Memory: %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
368 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
369 | "%dK data, %dK init)\n", | |
370 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
371 | codepages >> 10, datapages >> 10, initpages >> 10); | |
372 | ||
373 | /* | |
374 | * Turn on overcommit on tiny machines | |
375 | */ | |
376 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
377 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
378 | printk("Turning on overcommit\n"); | |
379 | } | |
380 | } | |
381 | ||
382 | void free_initmem(void){ | |
383 | #ifndef CONFIG_XIP_KERNEL | |
384 | free_area((unsigned long)(&__init_begin), | |
385 | (unsigned long)(&__init_end), | |
386 | "init"); | |
387 | #endif | |
388 | } | |
389 | ||
390 | #ifdef CONFIG_BLK_DEV_INITRD | |
391 | ||
392 | static int keep_initrd; | |
393 | ||
394 | void free_initrd_mem(unsigned long start, unsigned long end) | |
395 | { | |
396 | #ifdef CONFIG_XIP_KERNEL | |
397 | /* Only bin initrd if it is in RAM... */ | |
398 | if(!keep_initrd && start < 0x03000000) | |
399 | #else | |
400 | if (!keep_initrd) | |
401 | #endif | |
402 | free_area(start, end, "initrd"); | |
403 | } | |
404 | ||
405 | static int __init keepinitrd_setup(char *__unused) | |
406 | { | |
407 | keep_initrd = 1; | |
408 | return 1; | |
409 | } | |
410 | ||
411 | __setup("keepinitrd", keepinitrd_setup); | |
412 | #endif |