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14cf11af PM |
1 | /* |
2 | * PowerPC version | |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * | |
5 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
6 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
7 | * Copyright (C) 1996 Paul Mackerras | |
8 | * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk). | |
9 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) | |
10 | * | |
11 | * Derived from "arch/i386/mm/init.c" | |
12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/config.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/mm.h> | |
29 | #include <linux/stddef.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/bootmem.h> | |
32 | #include <linux/highmem.h> | |
33 | #include <linux/initrd.h> | |
34 | #include <linux/pagemap.h> | |
35 | ||
36 | #include <asm/pgalloc.h> | |
37 | #include <asm/prom.h> | |
38 | #include <asm/io.h> | |
39 | #include <asm/mmu_context.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/mmu.h> | |
42 | #include <asm/smp.h> | |
43 | #include <asm/machdep.h> | |
44 | #include <asm/btext.h> | |
45 | #include <asm/tlb.h> | |
14cf11af | 46 | #include <asm/prom.h> |
7c8c6b97 PM |
47 | #include <asm/lmb.h> |
48 | #include <asm/sections.h> | |
ab1f9dac PM |
49 | #ifdef CONFIG_PPC64 |
50 | #include <asm/vdso.h> | |
51 | #endif | |
14cf11af | 52 | |
14cf11af PM |
53 | #include "mmu_decl.h" |
54 | ||
55 | #ifndef CPU_FTR_COHERENT_ICACHE | |
56 | #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */ | |
57 | #define CPU_FTR_NOEXECUTE 0 | |
58 | #endif | |
59 | ||
7c8c6b97 PM |
60 | int init_bootmem_done; |
61 | int mem_init_done; | |
cf00a8d1 | 62 | unsigned long memory_limit; |
7c8c6b97 | 63 | |
14cf11af PM |
64 | /* |
65 | * This is called by /dev/mem to know if a given address has to | |
66 | * be mapped non-cacheable or not | |
67 | */ | |
68 | int page_is_ram(unsigned long pfn) | |
69 | { | |
70 | unsigned long paddr = (pfn << PAGE_SHIFT); | |
71 | ||
72 | #ifndef CONFIG_PPC64 /* XXX for now */ | |
73 | return paddr < __pa(high_memory); | |
74 | #else | |
75 | int i; | |
76 | for (i=0; i < lmb.memory.cnt; i++) { | |
77 | unsigned long base; | |
78 | ||
79 | base = lmb.memory.region[i].base; | |
80 | ||
81 | if ((paddr >= base) && | |
82 | (paddr < (base + lmb.memory.region[i].size))) { | |
83 | return 1; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | #endif | |
89 | } | |
90 | EXPORT_SYMBOL(page_is_ram); | |
91 | ||
8b150478 | 92 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
14cf11af PM |
93 | unsigned long size, pgprot_t vma_prot) |
94 | { | |
95 | if (ppc_md.phys_mem_access_prot) | |
8b150478 | 96 | return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot); |
14cf11af | 97 | |
8b150478 | 98 | if (!page_is_ram(pfn)) |
14cf11af PM |
99 | vma_prot = __pgprot(pgprot_val(vma_prot) |
100 | | _PAGE_GUARDED | _PAGE_NO_CACHE); | |
101 | return vma_prot; | |
102 | } | |
103 | EXPORT_SYMBOL(phys_mem_access_prot); | |
104 | ||
105 | void show_mem(void) | |
106 | { | |
107 | unsigned long total = 0, reserved = 0; | |
108 | unsigned long shared = 0, cached = 0; | |
109 | unsigned long highmem = 0; | |
110 | struct page *page; | |
111 | pg_data_t *pgdat; | |
112 | unsigned long i; | |
113 | ||
114 | printk("Mem-info:\n"); | |
115 | show_free_areas(); | |
116 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
117 | for_each_pgdat(pgdat) { | |
118 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
119 | page = pgdat_page_nr(pgdat, i); | |
120 | total++; | |
121 | if (PageHighMem(page)) | |
122 | highmem++; | |
123 | if (PageReserved(page)) | |
124 | reserved++; | |
125 | else if (PageSwapCache(page)) | |
126 | cached++; | |
127 | else if (page_count(page)) | |
128 | shared += page_count(page) - 1; | |
129 | } | |
130 | } | |
131 | printk("%ld pages of RAM\n", total); | |
132 | #ifdef CONFIG_HIGHMEM | |
133 | printk("%ld pages of HIGHMEM\n", highmem); | |
134 | #endif | |
135 | printk("%ld reserved pages\n", reserved); | |
136 | printk("%ld pages shared\n", shared); | |
137 | printk("%ld pages swap cached\n", cached); | |
138 | } | |
139 | ||
7c8c6b97 PM |
140 | /* |
141 | * Initialize the bootmem system and give it all the memory we | |
142 | * have available. If we are using highmem, we only put the | |
143 | * lowmem into the bootmem system. | |
144 | */ | |
145 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
146 | void __init do_init_bootmem(void) | |
147 | { | |
148 | unsigned long i; | |
149 | unsigned long start, bootmap_pages; | |
150 | unsigned long total_pages; | |
151 | int boot_mapsize; | |
152 | ||
153 | max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT; | |
154 | #ifdef CONFIG_HIGHMEM | |
155 | total_pages = total_lowmem >> PAGE_SHIFT; | |
156 | #endif | |
157 | ||
158 | /* | |
159 | * Find an area to use for the bootmem bitmap. Calculate the size of | |
160 | * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE. | |
161 | * Add 1 additional page in case the address isn't page-aligned. | |
162 | */ | |
163 | bootmap_pages = bootmem_bootmap_pages(total_pages); | |
164 | ||
165 | start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE); | |
166 | BUG_ON(!start); | |
167 | ||
168 | boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages); | |
169 | ||
170 | /* Add all physical memory to the bootmem map, mark each area | |
171 | * present. | |
172 | */ | |
173 | for (i = 0; i < lmb.memory.cnt; i++) { | |
174 | unsigned long base = lmb.memory.region[i].base; | |
175 | unsigned long size = lmb_size_bytes(&lmb.memory, i); | |
176 | #ifdef CONFIG_HIGHMEM | |
177 | if (base >= total_lowmem) | |
178 | continue; | |
179 | if (base + size > total_lowmem) | |
180 | size = total_lowmem - base; | |
181 | #endif | |
182 | free_bootmem(base, size); | |
183 | } | |
184 | ||
185 | /* reserve the sections we're already using */ | |
186 | for (i = 0; i < lmb.reserved.cnt; i++) | |
187 | reserve_bootmem(lmb.reserved.region[i].base, | |
188 | lmb_size_bytes(&lmb.reserved, i)); | |
189 | ||
190 | /* XXX need to clip this if using highmem? */ | |
191 | for (i = 0; i < lmb.memory.cnt; i++) | |
192 | memory_present(0, lmb_start_pfn(&lmb.memory, i), | |
193 | lmb_end_pfn(&lmb.memory, i)); | |
194 | init_bootmem_done = 1; | |
195 | } | |
196 | ||
197 | /* | |
198 | * paging_init() sets up the page tables - in fact we've already done this. | |
199 | */ | |
200 | void __init paging_init(void) | |
201 | { | |
202 | unsigned long zones_size[MAX_NR_ZONES]; | |
203 | unsigned long zholes_size[MAX_NR_ZONES]; | |
204 | unsigned long total_ram = lmb_phys_mem_size(); | |
205 | unsigned long top_of_ram = lmb_end_of_DRAM(); | |
206 | ||
207 | #ifdef CONFIG_HIGHMEM | |
208 | map_page(PKMAP_BASE, 0, 0); /* XXX gross */ | |
209 | pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k | |
210 | (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE); | |
211 | map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */ | |
212 | kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k | |
213 | (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN); | |
214 | kmap_prot = PAGE_KERNEL; | |
215 | #endif /* CONFIG_HIGHMEM */ | |
216 | ||
217 | printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n", | |
218 | top_of_ram, total_ram); | |
219 | printk(KERN_INFO "Memory hole size: %ldMB\n", | |
220 | (top_of_ram - total_ram) >> 20); | |
221 | /* | |
222 | * All pages are DMA-able so we put them all in the DMA zone. | |
223 | */ | |
224 | memset(zones_size, 0, sizeof(zones_size)); | |
225 | memset(zholes_size, 0, sizeof(zholes_size)); | |
226 | ||
227 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
228 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
229 | ||
230 | #ifdef CONFIG_HIGHMEM | |
231 | zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT; | |
232 | zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT; | |
233 | zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
234 | #else | |
235 | zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; | |
236 | zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT; | |
237 | #endif /* CONFIG_HIGHMEM */ | |
238 | ||
239 | free_area_init_node(0, NODE_DATA(0), zones_size, | |
240 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
241 | } | |
242 | #endif /* ! CONFIG_NEED_MULTIPLE_NODES */ | |
243 | ||
244 | void __init mem_init(void) | |
245 | { | |
246 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
247 | int nid; | |
248 | #endif | |
249 | pg_data_t *pgdat; | |
250 | unsigned long i; | |
251 | struct page *page; | |
252 | unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize; | |
253 | ||
254 | num_physpages = max_pfn; /* RAM is assumed contiguous */ | |
255 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
256 | ||
257 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
258 | for_each_online_node(nid) { | |
259 | if (NODE_DATA(nid)->node_spanned_pages != 0) { | |
260 | printk("freeing bootmem node %x\n", nid); | |
261 | totalram_pages += | |
262 | free_all_bootmem_node(NODE_DATA(nid)); | |
263 | } | |
264 | } | |
265 | #else | |
266 | max_mapnr = num_physpages; | |
267 | totalram_pages += free_all_bootmem(); | |
268 | #endif | |
269 | for_each_pgdat(pgdat) { | |
270 | for (i = 0; i < pgdat->node_spanned_pages; i++) { | |
271 | page = pgdat_page_nr(pgdat, i); | |
272 | if (PageReserved(page)) | |
273 | reservedpages++; | |
274 | } | |
275 | } | |
276 | ||
277 | codesize = (unsigned long)&_sdata - (unsigned long)&_stext; | |
278 | datasize = (unsigned long)&__init_begin - (unsigned long)&_sdata; | |
279 | initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin; | |
280 | bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start; | |
281 | ||
282 | #ifdef CONFIG_HIGHMEM | |
283 | { | |
284 | unsigned long pfn, highmem_mapnr; | |
285 | ||
286 | highmem_mapnr = total_lowmem >> PAGE_SHIFT; | |
287 | for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) { | |
288 | struct page *page = pfn_to_page(pfn); | |
289 | ||
290 | ClearPageReserved(page); | |
291 | set_page_count(page, 1); | |
292 | __free_page(page); | |
293 | totalhigh_pages++; | |
294 | } | |
295 | totalram_pages += totalhigh_pages; | |
296 | printk(KERN_INFO "High memory: %luk\n", | |
297 | totalhigh_pages << (PAGE_SHIFT-10)); | |
298 | } | |
299 | #endif /* CONFIG_HIGHMEM */ | |
300 | ||
301 | printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, " | |
302 | "%luk reserved, %luk data, %luk bss, %luk init)\n", | |
303 | (unsigned long)nr_free_pages() << (PAGE_SHIFT-10), | |
304 | num_physpages << (PAGE_SHIFT-10), | |
305 | codesize >> 10, | |
306 | reservedpages << (PAGE_SHIFT-10), | |
307 | datasize >> 10, | |
308 | bsssize >> 10, | |
309 | initsize >> 10); | |
310 | ||
311 | mem_init_done = 1; | |
312 | ||
313 | #ifdef CONFIG_PPC64 | |
314 | /* Initialize the vDSO */ | |
315 | vdso_init(); | |
316 | #endif | |
317 | } | |
318 | ||
14cf11af PM |
319 | /* |
320 | * This is called when a page has been modified by the kernel. | |
321 | * It just marks the page as not i-cache clean. We do the i-cache | |
322 | * flush later when the page is given to a user process, if necessary. | |
323 | */ | |
324 | void flush_dcache_page(struct page *page) | |
325 | { | |
326 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
327 | return; | |
328 | /* avoid an atomic op if possible */ | |
329 | if (test_bit(PG_arch_1, &page->flags)) | |
330 | clear_bit(PG_arch_1, &page->flags); | |
331 | } | |
332 | EXPORT_SYMBOL(flush_dcache_page); | |
333 | ||
334 | void flush_dcache_icache_page(struct page *page) | |
335 | { | |
336 | #ifdef CONFIG_BOOKE | |
337 | void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE); | |
338 | __flush_dcache_icache(start); | |
339 | kunmap_atomic(start, KM_PPC_SYNC_ICACHE); | |
ab1f9dac | 340 | #elif defined(CONFIG_8xx) || defined(CONFIG_PPC64) |
14cf11af PM |
341 | /* On 8xx there is no need to kmap since highmem is not supported */ |
342 | __flush_dcache_icache(page_address(page)); | |
343 | #else | |
344 | __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT); | |
345 | #endif | |
346 | ||
347 | } | |
348 | void clear_user_page(void *page, unsigned long vaddr, struct page *pg) | |
349 | { | |
350 | clear_page(page); | |
351 | ||
352 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
353 | return; | |
354 | /* | |
355 | * We shouldnt have to do this, but some versions of glibc | |
356 | * require it (ld.so assumes zero filled pages are icache clean) | |
357 | * - Anton | |
358 | */ | |
359 | ||
360 | /* avoid an atomic op if possible */ | |
361 | if (test_bit(PG_arch_1, &pg->flags)) | |
362 | clear_bit(PG_arch_1, &pg->flags); | |
363 | } | |
364 | EXPORT_SYMBOL(clear_user_page); | |
365 | ||
366 | void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, | |
367 | struct page *pg) | |
368 | { | |
369 | copy_page(vto, vfrom); | |
370 | ||
371 | /* | |
372 | * We should be able to use the following optimisation, however | |
373 | * there are two problems. | |
374 | * Firstly a bug in some versions of binutils meant PLT sections | |
375 | * were not marked executable. | |
376 | * Secondly the first word in the GOT section is blrl, used | |
377 | * to establish the GOT address. Until recently the GOT was | |
378 | * not marked executable. | |
379 | * - Anton | |
380 | */ | |
381 | #if 0 | |
382 | if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0)) | |
383 | return; | |
384 | #endif | |
385 | ||
386 | if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) | |
387 | return; | |
388 | ||
389 | /* avoid an atomic op if possible */ | |
390 | if (test_bit(PG_arch_1, &pg->flags)) | |
391 | clear_bit(PG_arch_1, &pg->flags); | |
392 | } | |
393 | ||
394 | void flush_icache_user_range(struct vm_area_struct *vma, struct page *page, | |
395 | unsigned long addr, int len) | |
396 | { | |
397 | unsigned long maddr; | |
398 | ||
399 | maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); | |
400 | flush_icache_range(maddr, maddr + len); | |
401 | kunmap(page); | |
402 | } | |
403 | EXPORT_SYMBOL(flush_icache_user_range); | |
404 | ||
405 | /* | |
406 | * This is called at the end of handling a user page fault, when the | |
407 | * fault has been handled by updating a PTE in the linux page tables. | |
408 | * We use it to preload an HPTE into the hash table corresponding to | |
409 | * the updated linux PTE. | |
410 | * | |
411 | * This must always be called with the mm->page_table_lock held | |
412 | */ | |
413 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, | |
414 | pte_t pte) | |
415 | { | |
416 | /* handle i-cache coherency */ | |
417 | unsigned long pfn = pte_pfn(pte); | |
418 | #ifdef CONFIG_PPC32 | |
419 | pmd_t *pmd; | |
420 | #else | |
421 | unsigned long vsid; | |
422 | void *pgdir; | |
423 | pte_t *ptep; | |
424 | int local = 0; | |
425 | cpumask_t tmp; | |
426 | unsigned long flags; | |
427 | #endif | |
428 | ||
429 | /* handle i-cache coherency */ | |
430 | if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) && | |
431 | !cpu_has_feature(CPU_FTR_NOEXECUTE) && | |
432 | pfn_valid(pfn)) { | |
433 | struct page *page = pfn_to_page(pfn); | |
434 | if (!PageReserved(page) | |
435 | && !test_bit(PG_arch_1, &page->flags)) { | |
436 | if (vma->vm_mm == current->active_mm) { | |
437 | #ifdef CONFIG_8xx | |
438 | /* On 8xx, cache control instructions (particularly | |
439 | * "dcbst" from flush_dcache_icache) fault as write | |
440 | * operation if there is an unpopulated TLB entry | |
441 | * for the address in question. To workaround that, | |
442 | * we invalidate the TLB here, thus avoiding dcbst | |
443 | * misbehaviour. | |
444 | */ | |
445 | _tlbie(address); | |
446 | #endif | |
447 | __flush_dcache_icache((void *) address); | |
448 | } else | |
449 | flush_dcache_icache_page(page); | |
450 | set_bit(PG_arch_1, &page->flags); | |
451 | } | |
452 | } | |
453 | ||
454 | #ifdef CONFIG_PPC_STD_MMU | |
455 | /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */ | |
456 | if (!pte_young(pte) || address >= TASK_SIZE) | |
457 | return; | |
458 | #ifdef CONFIG_PPC32 | |
459 | if (Hash == 0) | |
460 | return; | |
461 | pmd = pmd_offset(pgd_offset(vma->vm_mm, address), address); | |
462 | if (!pmd_none(*pmd)) | |
463 | add_hash_page(vma->vm_mm->context, address, pmd_val(*pmd)); | |
464 | #else | |
465 | pgdir = vma->vm_mm->pgd; | |
466 | if (pgdir == NULL) | |
467 | return; | |
468 | ||
ab1f9dac | 469 | ptep = find_linux_pte(pgdir, address); |
14cf11af PM |
470 | if (!ptep) |
471 | return; | |
472 | ||
ab1f9dac | 473 | vsid = get_vsid(vma->vm_mm->context.id, address); |
14cf11af PM |
474 | |
475 | local_irq_save(flags); | |
476 | tmp = cpumask_of_cpu(smp_processor_id()); | |
477 | if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp)) | |
478 | local = 1; | |
479 | ||
98599013 | 480 | __hash_page(address, 0, vsid, ptep, 0x300, local); |
14cf11af PM |
481 | local_irq_restore(flags); |
482 | #endif | |
483 | #endif | |
484 | } |