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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> | |
22a9835c | 26 | #include <linux/pfn.h> |
1da177e4 LT |
27 | |
28 | #include <asm/segment.h> | |
29 | #include <asm/mach-types.h> | |
30 | #include <asm/dma.h> | |
31 | #include <asm/hardware.h> | |
32 | #include <asm/setup.h> | |
33 | #include <asm/tlb.h> | |
34 | ||
35 | #include <asm/map.h> | |
36 | ||
37 | ||
38 | #define TABLE_SIZE PTRS_PER_PTE * sizeof(pte_t)) | |
39 | ||
40 | struct mmu_gather mmu_gathers[NR_CPUS]; | |
41 | ||
42 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
43 | extern char _stext, _text, _etext, _end, __init_begin, __init_end; | |
44 | #ifdef CONFIG_XIP_KERNEL | |
45 | extern char _endtext, _sdata; | |
46 | #endif | |
47 | extern unsigned long phys_initrd_start; | |
48 | extern unsigned long phys_initrd_size; | |
49 | ||
50 | /* | |
51 | * The sole use of this is to pass memory configuration | |
52 | * data from paging_init to mem_init. | |
53 | */ | |
54 | static struct meminfo meminfo __initdata = { 0, }; | |
55 | ||
56 | /* | |
57 | * empty_zero_page is a special page that is used for | |
58 | * zero-initialized data and COW. | |
59 | */ | |
60 | struct page *empty_zero_page; | |
61 | ||
62 | void show_mem(void) | |
63 | { | |
64 | int free = 0, total = 0, reserved = 0; | |
65 | int shared = 0, cached = 0, slab = 0; | |
66 | struct page *page, *end; | |
67 | ||
68 | printk("Mem-info:\n"); | |
69 | show_free_areas(); | |
70 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
71 | ||
72 | ||
73 | page = NODE_MEM_MAP(0); | |
74 | end = page + NODE_DATA(0)->node_spanned_pages; | |
75 | ||
76 | do { | |
77 | total++; | |
78 | if (PageReserved(page)) | |
79 | reserved++; | |
80 | else if (PageSwapCache(page)) | |
81 | cached++; | |
82 | else if (PageSlab(page)) | |
83 | slab++; | |
84 | else if (!page_count(page)) | |
85 | free++; | |
86 | else | |
87 | shared += page_count(page) - 1; | |
88 | page++; | |
89 | } while (page < end); | |
90 | ||
91 | printk("%d pages of RAM\n", total); | |
92 | printk("%d free pages\n", free); | |
93 | printk("%d reserved pages\n", reserved); | |
94 | printk("%d slab pages\n", slab); | |
95 | printk("%d pages shared\n", shared); | |
96 | printk("%d pages swap cached\n", cached); | |
97 | } | |
98 | ||
99 | struct node_info { | |
100 | unsigned int start; | |
101 | unsigned int end; | |
102 | int bootmap_pages; | |
103 | }; | |
104 | ||
1da177e4 LT |
105 | /* |
106 | * FIXME: We really want to avoid allocating the bootmap bitmap | |
107 | * over the top of the initrd. Hopefully, this is located towards | |
108 | * the start of a bank, so if we allocate the bootmap bitmap at | |
109 | * the end, we won't clash. | |
110 | */ | |
111 | static unsigned int __init | |
112 | find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages) | |
113 | { | |
114 | unsigned int start_pfn, bootmap_pfn; | |
115 | unsigned int start, end; | |
116 | ||
117 | start_pfn = PFN_UP((unsigned long)&_end); | |
118 | bootmap_pfn = 0; | |
119 | ||
120 | /* ARM26 machines only have one node */ | |
121 | if (mi->bank->node != 0) | |
122 | BUG(); | |
123 | ||
124 | start = PFN_UP(mi->bank->start); | |
125 | end = PFN_DOWN(mi->bank->size + mi->bank->start); | |
126 | ||
127 | if (start < start_pfn) | |
128 | start = start_pfn; | |
129 | ||
130 | if (end <= start) | |
131 | BUG(); | |
132 | ||
133 | if (end - start >= bootmap_pages) | |
134 | bootmap_pfn = start; | |
135 | else | |
136 | BUG(); | |
137 | ||
138 | return bootmap_pfn; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Scan the memory info structure and pull out: | |
143 | * - the end of memory | |
144 | * - the number of nodes | |
145 | * - the pfn range of each node | |
146 | * - the number of bootmem bitmap pages | |
147 | */ | |
148 | static void __init | |
149 | find_memend_and_nodes(struct meminfo *mi, struct node_info *np) | |
150 | { | |
151 | unsigned int memend_pfn = 0; | |
152 | ||
153 | nodes_clear(node_online_map); | |
154 | node_set_online(0); | |
155 | ||
156 | np->bootmap_pages = 0; | |
157 | ||
158 | if (mi->bank->size == 0) { | |
159 | BUG(); | |
160 | } | |
161 | ||
162 | /* | |
163 | * Get the start and end pfns for this bank | |
164 | */ | |
165 | np->start = PFN_UP(mi->bank->start); | |
166 | np->end = PFN_DOWN(mi->bank->start + mi->bank->size); | |
167 | ||
168 | if (memend_pfn < np->end) | |
169 | memend_pfn = np->end; | |
170 | ||
171 | /* | |
172 | * Calculate the number of pages we require to | |
173 | * store the bootmem bitmaps. | |
174 | */ | |
175 | np->bootmap_pages = bootmem_bootmap_pages(np->end - np->start); | |
176 | ||
177 | /* | |
178 | * This doesn't seem to be used by the Linux memory | |
179 | * manager any more. If we can get rid of it, we | |
180 | * also get rid of some of the stuff above as well. | |
181 | */ | |
182 | max_low_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); | |
183 | max_pfn = memend_pfn - PFN_DOWN(PHYS_OFFSET); | |
184 | mi->end = memend_pfn << PAGE_SHIFT; | |
185 | ||
186 | } | |
187 | ||
188 | /* | |
189 | * Initialise the bootmem allocator for all nodes. This is called | |
190 | * early during the architecture specific initialisation. | |
191 | */ | |
192 | void __init bootmem_init(struct meminfo *mi) | |
193 | { | |
194 | struct node_info node_info; | |
195 | unsigned int bootmap_pfn; | |
196 | pg_data_t *pgdat = NODE_DATA(0); | |
197 | ||
198 | find_memend_and_nodes(mi, &node_info); | |
199 | ||
200 | bootmap_pfn = find_bootmap_pfn(mi, node_info.bootmap_pages); | |
201 | ||
202 | /* | |
203 | * Note that node 0 must always have some pages. | |
204 | */ | |
205 | if (node_info.end == 0) | |
206 | BUG(); | |
207 | ||
208 | /* | |
209 | * Initialise the bootmem allocator. | |
210 | */ | |
211 | init_bootmem_node(pgdat, bootmap_pfn, node_info.start, node_info.end); | |
212 | ||
213 | /* | |
214 | * Register all available RAM in this node with the bootmem allocator. | |
215 | */ | |
216 | free_bootmem_node(pgdat, mi->bank->start, mi->bank->size); | |
217 | ||
218 | /* | |
219 | * Register the kernel text and data with bootmem. | |
220 | * Note: with XIP we dont register .text since | |
221 | * its in ROM. | |
222 | */ | |
223 | #ifdef CONFIG_XIP_KERNEL | |
224 | reserve_bootmem_node(pgdat, __pa(&_sdata), &_end - &_sdata); | |
225 | #else | |
226 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
227 | #endif | |
228 | ||
229 | /* | |
230 | * And don't forget to reserve the allocator bitmap, | |
231 | * which will be freed later. | |
232 | */ | |
233 | reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT, | |
234 | node_info.bootmap_pages << PAGE_SHIFT); | |
235 | ||
236 | /* | |
237 | * These should likewise go elsewhere. They pre-reserve | |
238 | * the screen memory region at the start of main system | |
239 | * memory. FIXME - screen RAM is not 512K! | |
240 | */ | |
241 | reserve_bootmem_node(pgdat, 0x02000000, 0x00080000); | |
242 | ||
243 | #ifdef CONFIG_BLK_DEV_INITRD | |
244 | initrd_start = phys_initrd_start; | |
245 | initrd_end = initrd_start + phys_initrd_size; | |
246 | ||
247 | /* Achimedes machines only have one node, so initrd is in node 0 */ | |
248 | #ifdef CONFIG_XIP_KERNEL | |
249 | /* Only reserve initrd space if it is in RAM */ | |
250 | if(initrd_start && initrd_start < 0x03000000){ | |
251 | #else | |
252 | if(initrd_start){ | |
253 | #endif | |
254 | reserve_bootmem_node(pgdat, __pa(initrd_start), | |
255 | initrd_end - initrd_start); | |
256 | } | |
257 | #endif /* CONFIG_BLK_DEV_INITRD */ | |
258 | ||
259 | ||
260 | } | |
261 | ||
262 | /* | |
263 | * paging_init() sets up the page tables, initialises the zone memory | |
264 | * maps, and sets up the zero page, bad page and bad page tables. | |
265 | */ | |
266 | void __init paging_init(struct meminfo *mi) | |
267 | { | |
268 | void *zero_page; | |
269 | unsigned long zone_size[MAX_NR_ZONES]; | |
270 | unsigned long zhole_size[MAX_NR_ZONES]; | |
271 | struct bootmem_data *bdata; | |
272 | pg_data_t *pgdat; | |
273 | int i; | |
274 | ||
275 | memcpy(&meminfo, mi, sizeof(meminfo)); | |
276 | ||
277 | /* | |
278 | * allocate the zero page. Note that we count on this going ok. | |
279 | */ | |
280 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); | |
281 | ||
282 | /* | |
283 | * initialise the page tables. | |
284 | */ | |
285 | memtable_init(mi); | |
286 | flush_tlb_all(); | |
287 | ||
288 | /* | |
289 | * initialise the zones in node 0 (archimedes have only 1 node) | |
290 | */ | |
291 | ||
292 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
293 | zone_size[i] = 0; | |
294 | zhole_size[i] = 0; | |
295 | } | |
296 | ||
297 | pgdat = NODE_DATA(0); | |
298 | bdata = pgdat->bdata; | |
299 | zone_size[0] = bdata->node_low_pfn - | |
300 | (bdata->node_boot_start >> PAGE_SHIFT); | |
301 | if (!zone_size[0]) | |
302 | BUG(); | |
303 | pgdat->node_mem_map = NULL; | |
304 | free_area_init_node(0, pgdat, zone_size, | |
305 | bdata->node_boot_start >> PAGE_SHIFT, zhole_size); | |
306 | ||
307 | /* | |
308 | * finish off the bad pages once | |
309 | * the mem_map is initialised | |
310 | */ | |
311 | memzero(zero_page, PAGE_SIZE); | |
312 | empty_zero_page = virt_to_page(zero_page); | |
313 | } | |
314 | ||
315 | static inline void free_area(unsigned long addr, unsigned long end, char *s) | |
316 | { | |
317 | unsigned int size = (end - addr) >> 10; | |
318 | ||
319 | for (; addr < end; addr += PAGE_SIZE) { | |
320 | struct page *page = virt_to_page(addr); | |
321 | ClearPageReserved(page); | |
7835e98b | 322 | init_page_count(page); |
1da177e4 LT |
323 | free_page(addr); |
324 | totalram_pages++; | |
325 | } | |
326 | ||
327 | if (size && s) | |
328 | printk(KERN_INFO "Freeing %s memory: %dK\n", s, size); | |
329 | } | |
330 | ||
331 | /* | |
332 | * mem_init() marks the free areas in the mem_map and tells us how much | |
333 | * memory is free. This is done after various parts of the system have | |
334 | * claimed their memory after the kernel image. | |
335 | */ | |
336 | void __init mem_init(void) | |
337 | { | |
338 | unsigned int codepages, datapages, initpages; | |
339 | pg_data_t *pgdat = NODE_DATA(0); | |
340 | extern int sysctl_overcommit_memory; | |
341 | ||
342 | ||
343 | /* Note: data pages includes BSS */ | |
344 | #ifdef CONFIG_XIP_KERNEL | |
345 | codepages = &_endtext - &_text; | |
346 | datapages = &_end - &_sdata; | |
347 | #else | |
348 | codepages = &_etext - &_text; | |
349 | datapages = &_end - &_etext; | |
350 | #endif | |
351 | initpages = &__init_end - &__init_begin; | |
352 | ||
353 | high_memory = (void *)__va(meminfo.end); | |
354 | max_mapnr = virt_to_page(high_memory) - mem_map; | |
355 | ||
356 | /* this will put all unused low memory onto the freelists */ | |
357 | if (pgdat->node_spanned_pages != 0) | |
358 | totalram_pages += free_all_bootmem_node(pgdat); | |
359 | ||
360 | num_physpages = meminfo.bank[0].size >> PAGE_SHIFT; | |
361 | ||
362 | printk(KERN_INFO "Memory: %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); | |
363 | printk(KERN_NOTICE "Memory: %luKB available (%dK code, " | |
364 | "%dK data, %dK init)\n", | |
365 | (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), | |
366 | codepages >> 10, datapages >> 10, initpages >> 10); | |
367 | ||
368 | /* | |
369 | * Turn on overcommit on tiny machines | |
370 | */ | |
371 | if (PAGE_SIZE >= 16384 && num_physpages <= 128) { | |
372 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; | |
373 | printk("Turning on overcommit\n"); | |
374 | } | |
375 | } | |
376 | ||
377 | void free_initmem(void){ | |
378 | #ifndef CONFIG_XIP_KERNEL | |
379 | free_area((unsigned long)(&__init_begin), | |
380 | (unsigned long)(&__init_end), | |
381 | "init"); | |
382 | #endif | |
383 | } | |
384 | ||
385 | #ifdef CONFIG_BLK_DEV_INITRD | |
386 | ||
387 | static int keep_initrd; | |
388 | ||
389 | void free_initrd_mem(unsigned long start, unsigned long end) | |
390 | { | |
391 | #ifdef CONFIG_XIP_KERNEL | |
392 | /* Only bin initrd if it is in RAM... */ | |
393 | if(!keep_initrd && start < 0x03000000) | |
394 | #else | |
395 | if (!keep_initrd) | |
396 | #endif | |
397 | free_area(start, end, "initrd"); | |
398 | } | |
399 | ||
400 | static int __init keepinitrd_setup(char *__unused) | |
401 | { | |
402 | keep_initrd = 1; | |
403 | return 1; | |
404 | } | |
405 | ||
406 | __setup("keepinitrd", keepinitrd_setup); | |
407 | #endif |