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f5df8e26 JH |
1 | /* |
2 | * Copyright (C) 2005,2006,2007,2008,2009,2010 Imagination Technologies | |
3 | * | |
4 | */ | |
5 | ||
44c24510 | 6 | #include <linux/export.h> |
f5df8e26 JH |
7 | #include <linux/mm.h> |
8 | #include <linux/swap.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/bootmem.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/percpu.h> | |
13 | #include <linux/memblock.h> | |
14 | #include <linux/initrd.h> | |
f5df8e26 JH |
15 | |
16 | #include <asm/setup.h> | |
17 | #include <asm/page.h> | |
18 | #include <asm/pgalloc.h> | |
19 | #include <asm/mmu.h> | |
20 | #include <asm/mmu_context.h> | |
21 | #include <asm/sections.h> | |
22 | #include <asm/tlb.h> | |
23 | #include <asm/user_gateway.h> | |
24 | #include <asm/mmzone.h> | |
25 | #include <asm/fixmap.h> | |
26 | ||
27 | unsigned long pfn_base; | |
44c24510 | 28 | EXPORT_SYMBOL(pfn_base); |
f5df8e26 JH |
29 | |
30 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data; | |
31 | ||
32 | unsigned long empty_zero_page; | |
44c24510 | 33 | EXPORT_SYMBOL(empty_zero_page); |
f5df8e26 JH |
34 | |
35 | extern char __user_gateway_start; | |
36 | extern char __user_gateway_end; | |
37 | ||
38 | void *gateway_page; | |
39 | ||
40 | /* | |
41 | * Insert the gateway page into a set of page tables, creating the | |
42 | * page tables if necessary. | |
43 | */ | |
44 | static void insert_gateway_page(pgd_t *pgd, unsigned long address) | |
45 | { | |
46 | pud_t *pud; | |
47 | pmd_t *pmd; | |
48 | pte_t *pte; | |
49 | ||
50 | BUG_ON(!pgd_present(*pgd)); | |
51 | ||
52 | pud = pud_offset(pgd, address); | |
53 | BUG_ON(!pud_present(*pud)); | |
54 | ||
55 | pmd = pmd_offset(pud, address); | |
56 | if (!pmd_present(*pmd)) { | |
57 | pte = alloc_bootmem_pages(PAGE_SIZE); | |
58 | set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte))); | |
59 | } | |
60 | ||
61 | pte = pte_offset_kernel(pmd, address); | |
62 | set_pte(pte, pfn_pte(__pa(gateway_page) >> PAGE_SHIFT, PAGE_READONLY)); | |
63 | } | |
64 | ||
65 | /* Alloc and map a page in a known location accessible to userspace. */ | |
66 | static void __init user_gateway_init(void) | |
67 | { | |
68 | unsigned long address = USER_GATEWAY_PAGE; | |
69 | int offset = pgd_index(address); | |
70 | pgd_t *pgd; | |
71 | ||
72 | gateway_page = alloc_bootmem_pages(PAGE_SIZE); | |
73 | ||
74 | pgd = swapper_pg_dir + offset; | |
75 | insert_gateway_page(pgd, address); | |
76 | ||
77 | #ifdef CONFIG_METAG_META12 | |
78 | /* | |
79 | * Insert the gateway page into our current page tables even | |
80 | * though we've already inserted it into our reference page | |
81 | * table (swapper_pg_dir). This is because with a META1 mmu we | |
82 | * copy just the user address range and not the gateway page | |
83 | * entry on context switch, see switch_mmu(). | |
84 | */ | |
85 | pgd = (pgd_t *)mmu_get_base() + offset; | |
86 | insert_gateway_page(pgd, address); | |
87 | #endif /* CONFIG_METAG_META12 */ | |
88 | ||
89 | BUG_ON((&__user_gateway_end - &__user_gateway_start) > PAGE_SIZE); | |
90 | ||
91 | gateway_page += (address & ~PAGE_MASK); | |
92 | ||
93 | memcpy(gateway_page, &__user_gateway_start, | |
94 | &__user_gateway_end - &__user_gateway_start); | |
95 | ||
96 | /* | |
97 | * We don't need to flush the TLB here, there should be no mapping | |
98 | * present at boot for this address and only valid mappings are in | |
99 | * the TLB (apart from on Meta 1.x, but those cached invalid | |
100 | * mappings should be impossible to hit here). | |
101 | * | |
102 | * We don't flush the code cache here even though we have written | |
103 | * code through the data cache and they may not be coherent. At | |
104 | * this point we assume there is no stale data in the code cache | |
105 | * for this address so there is no need to flush. | |
106 | */ | |
107 | } | |
108 | ||
109 | static void __init allocate_pgdat(unsigned int nid) | |
110 | { | |
111 | unsigned long start_pfn, end_pfn; | |
112 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
113 | unsigned long phys; | |
114 | #endif | |
115 | ||
116 | get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); | |
117 | ||
118 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
119 | phys = __memblock_alloc_base(sizeof(struct pglist_data), | |
120 | SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT); | |
121 | /* Retry with all of system memory */ | |
122 | if (!phys) | |
123 | phys = __memblock_alloc_base(sizeof(struct pglist_data), | |
124 | SMP_CACHE_BYTES, | |
125 | memblock_end_of_DRAM()); | |
126 | if (!phys) | |
127 | panic("Can't allocate pgdat for node %d\n", nid); | |
128 | ||
129 | NODE_DATA(nid) = __va(phys); | |
130 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); | |
131 | ||
132 | NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; | |
133 | #endif | |
134 | ||
135 | NODE_DATA(nid)->node_start_pfn = start_pfn; | |
136 | NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; | |
137 | } | |
138 | ||
139 | static void __init bootmem_init_one_node(unsigned int nid) | |
140 | { | |
141 | unsigned long total_pages, paddr; | |
142 | unsigned long end_pfn; | |
143 | struct pglist_data *p; | |
144 | ||
145 | p = NODE_DATA(nid); | |
146 | ||
147 | /* Nothing to do.. */ | |
148 | if (!p->node_spanned_pages) | |
149 | return; | |
150 | ||
6408068e | 151 | end_pfn = pgdat_end_pfn(p); |
f5df8e26 JH |
152 | #ifdef CONFIG_HIGHMEM |
153 | if (end_pfn > max_low_pfn) | |
154 | end_pfn = max_low_pfn; | |
155 | #endif | |
156 | ||
157 | total_pages = bootmem_bootmap_pages(end_pfn - p->node_start_pfn); | |
158 | ||
159 | paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE); | |
160 | if (!paddr) | |
161 | panic("Can't allocate bootmap for nid[%d]\n", nid); | |
162 | ||
163 | init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn); | |
164 | ||
165 | free_bootmem_with_active_regions(nid, end_pfn); | |
166 | ||
167 | /* | |
168 | * XXX Handle initial reservations for the system memory node | |
169 | * only for the moment, we'll refactor this later for handling | |
170 | * reservations in other nodes. | |
171 | */ | |
172 | if (nid == 0) { | |
173 | struct memblock_region *reg; | |
174 | ||
175 | /* Reserve the sections we're already using. */ | |
176 | for_each_memblock(reserved, reg) { | |
177 | unsigned long size = reg->size; | |
178 | ||
179 | #ifdef CONFIG_HIGHMEM | |
180 | /* ...but not highmem */ | |
181 | if (PFN_DOWN(reg->base) >= highstart_pfn) | |
182 | continue; | |
183 | ||
184 | if (PFN_UP(reg->base + size) > highstart_pfn) | |
185 | size = (highstart_pfn - PFN_DOWN(reg->base)) | |
186 | << PAGE_SHIFT; | |
187 | #endif | |
188 | ||
189 | reserve_bootmem(reg->base, size, BOOTMEM_DEFAULT); | |
190 | } | |
191 | } | |
192 | ||
193 | sparse_memory_present_with_active_regions(nid); | |
194 | } | |
195 | ||
196 | static void __init do_init_bootmem(void) | |
197 | { | |
198 | struct memblock_region *reg; | |
199 | int i; | |
200 | ||
201 | /* Add active regions with valid PFNs. */ | |
202 | for_each_memblock(memory, reg) { | |
203 | unsigned long start_pfn, end_pfn; | |
204 | start_pfn = memblock_region_memory_base_pfn(reg); | |
205 | end_pfn = memblock_region_memory_end_pfn(reg); | |
206 | memblock_set_node(PFN_PHYS(start_pfn), | |
e7e8de59 TC |
207 | PFN_PHYS(end_pfn - start_pfn), |
208 | &memblock.memory, 0); | |
f5df8e26 JH |
209 | } |
210 | ||
211 | /* All of system RAM sits in node 0 for the non-NUMA case */ | |
212 | allocate_pgdat(0); | |
213 | node_set_online(0); | |
214 | ||
215 | soc_mem_setup(); | |
216 | ||
217 | for_each_online_node(i) | |
218 | bootmem_init_one_node(i); | |
219 | ||
220 | sparse_init(); | |
221 | } | |
222 | ||
223 | extern char _heap_start[]; | |
224 | ||
225 | static void __init init_and_reserve_mem(void) | |
226 | { | |
227 | unsigned long start_pfn, heap_start; | |
228 | u64 base = min_low_pfn << PAGE_SHIFT; | |
229 | u64 size = (max_low_pfn << PAGE_SHIFT) - base; | |
230 | ||
231 | heap_start = (unsigned long) &_heap_start; | |
232 | ||
233 | memblock_add(base, size); | |
234 | ||
235 | /* | |
236 | * Partially used pages are not usable - thus | |
237 | * we are rounding upwards: | |
238 | */ | |
239 | start_pfn = PFN_UP(__pa(heap_start)); | |
240 | ||
241 | /* | |
242 | * Reserve the kernel text. | |
243 | */ | |
244 | memblock_reserve(base, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - base); | |
245 | ||
246 | #ifdef CONFIG_HIGHMEM | |
247 | /* | |
248 | * Add & reserve highmem, so page structures are initialised. | |
249 | */ | |
250 | base = highstart_pfn << PAGE_SHIFT; | |
251 | size = (highend_pfn << PAGE_SHIFT) - base; | |
252 | if (size) { | |
253 | memblock_add(base, size); | |
254 | memblock_reserve(base, size); | |
255 | } | |
256 | #endif | |
257 | } | |
258 | ||
259 | #ifdef CONFIG_HIGHMEM | |
260 | /* | |
261 | * Ensure we have allocated page tables in swapper_pg_dir for the | |
262 | * fixed mappings range from 'start' to 'end'. | |
263 | */ | |
264 | static void __init allocate_pgtables(unsigned long start, unsigned long end) | |
265 | { | |
266 | pgd_t *pgd; | |
267 | pmd_t *pmd; | |
268 | pte_t *pte; | |
269 | int i, j; | |
270 | unsigned long vaddr; | |
271 | ||
272 | vaddr = start; | |
273 | i = pgd_index(vaddr); | |
274 | j = pmd_index(vaddr); | |
275 | pgd = swapper_pg_dir + i; | |
276 | ||
277 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
278 | pmd = (pmd_t *)pgd; | |
279 | for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) { | |
280 | vaddr += PMD_SIZE; | |
281 | ||
282 | if (!pmd_none(*pmd)) | |
283 | continue; | |
284 | ||
285 | pte = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE); | |
286 | pmd_populate_kernel(&init_mm, pmd, pte); | |
287 | } | |
288 | j = 0; | |
289 | } | |
290 | } | |
291 | ||
292 | static void __init fixedrange_init(void) | |
293 | { | |
294 | unsigned long vaddr, end; | |
295 | pgd_t *pgd; | |
296 | pud_t *pud; | |
297 | pmd_t *pmd; | |
298 | pte_t *pte; | |
299 | ||
300 | /* | |
301 | * Fixed mappings: | |
302 | */ | |
303 | vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; | |
304 | end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; | |
305 | allocate_pgtables(vaddr, end); | |
306 | ||
307 | /* | |
308 | * Permanent kmaps: | |
309 | */ | |
310 | vaddr = PKMAP_BASE; | |
311 | allocate_pgtables(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP); | |
312 | ||
313 | pgd = swapper_pg_dir + pgd_index(vaddr); | |
314 | pud = pud_offset(pgd, vaddr); | |
315 | pmd = pmd_offset(pud, vaddr); | |
316 | pte = pte_offset_kernel(pmd, vaddr); | |
317 | pkmap_page_table = pte; | |
318 | } | |
319 | #endif /* CONFIG_HIGHMEM */ | |
320 | ||
321 | /* | |
322 | * paging_init() continues the virtual memory environment setup which | |
323 | * was begun by the code in arch/metag/kernel/setup.c. | |
324 | */ | |
325 | void __init paging_init(unsigned long mem_end) | |
326 | { | |
327 | unsigned long max_zone_pfns[MAX_NR_ZONES]; | |
328 | int nid; | |
329 | ||
330 | init_and_reserve_mem(); | |
331 | ||
332 | memblock_allow_resize(); | |
333 | ||
334 | memblock_dump_all(); | |
335 | ||
336 | nodes_clear(node_online_map); | |
337 | ||
338 | init_new_context(&init_task, &init_mm); | |
339 | ||
340 | memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); | |
341 | ||
342 | do_init_bootmem(); | |
343 | mmu_init(mem_end); | |
344 | ||
345 | #ifdef CONFIG_HIGHMEM | |
346 | fixedrange_init(); | |
347 | kmap_init(); | |
348 | #endif | |
349 | ||
350 | /* Initialize the zero page to a bootmem page, already zeroed. */ | |
351 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
352 | ||
353 | user_gateway_init(); | |
354 | ||
355 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); | |
356 | ||
357 | for_each_online_node(nid) { | |
358 | pg_data_t *pgdat = NODE_DATA(nid); | |
359 | unsigned long low, start_pfn; | |
360 | ||
361 | start_pfn = pgdat->bdata->node_min_pfn; | |
362 | low = pgdat->bdata->node_low_pfn; | |
363 | ||
364 | if (max_zone_pfns[ZONE_NORMAL] < low) | |
365 | max_zone_pfns[ZONE_NORMAL] = low; | |
366 | ||
367 | #ifdef CONFIG_HIGHMEM | |
368 | max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; | |
369 | #endif | |
370 | pr_info("Node %u: start_pfn = 0x%lx, low = 0x%lx\n", | |
371 | nid, start_pfn, low); | |
372 | } | |
373 | ||
374 | free_area_init_nodes(max_zone_pfns); | |
375 | } | |
376 | ||
377 | void __init mem_init(void) | |
378 | { | |
f5df8e26 JH |
379 | #ifdef CONFIG_HIGHMEM |
380 | unsigned long tmp; | |
7b4b2a0d JL |
381 | |
382 | /* | |
383 | * Explicitly reset zone->managed_pages because highmem pages are | |
5ad62f24 | 384 | * freed before calling free_all_bootmem(); |
7b4b2a0d JL |
385 | */ |
386 | reset_all_zones_managed_pages(); | |
a564496e JL |
387 | for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) |
388 | free_highmem_page(pfn_to_page(tmp)); | |
f5df8e26 JH |
389 | #endif /* CONFIG_HIGHMEM */ |
390 | ||
5ad62f24 | 391 | free_all_bootmem(); |
132de671 | 392 | mem_init_print_info(NULL); |
f5df8e26 JH |
393 | } |
394 | ||
f5df8e26 JH |
395 | void free_initmem(void) |
396 | { | |
c9418368 | 397 | free_initmem_default(POISON_FREE_INITMEM); |
f5df8e26 JH |
398 | } |
399 | ||
400 | #ifdef CONFIG_BLK_DEV_INITRD | |
401 | void free_initrd_mem(unsigned long start, unsigned long end) | |
402 | { | |
11199692 JL |
403 | free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, |
404 | "initrd"); | |
f5df8e26 JH |
405 | } |
406 | #endif |