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Commit | Line | Data |
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14cf11af PM |
1 | /* |
2 | * This file contains the routines setting up the linux page tables. | |
3 | * -- paulus | |
4 | * | |
5 | * Derived from arch/ppc/mm/init.c: | |
6 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
7 | * | |
8 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) | |
9 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) | |
10 | * Copyright (C) 1996 Paul Mackerras | |
14cf11af PM |
11 | * |
12 | * Derived from "arch/i386/mm/init.c" | |
13 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * as published by the Free Software Foundation; either version | |
18 | * 2 of the License, or (at your option) any later version. | |
19 | * | |
20 | */ | |
21 | ||
14cf11af PM |
22 | #include <linux/kernel.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/types.h> | |
25 | #include <linux/mm.h> | |
26 | #include <linux/vmalloc.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/highmem.h> | |
95f72d1e | 29 | #include <linux/memblock.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
14cf11af PM |
31 | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/pgalloc.h> | |
2c419bde | 34 | #include <asm/fixmap.h> |
14cf11af | 35 | #include <asm/io.h> |
ae3a197e | 36 | #include <asm/setup.h> |
14cf11af PM |
37 | |
38 | #include "mmu_decl.h" | |
39 | ||
40 | unsigned long ioremap_base; | |
41 | unsigned long ioremap_bot; | |
920573bd | 42 | EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ |
14cf11af | 43 | |
c3993f10 | 44 | #ifdef CONFIG_6xx |
14cf11af PM |
45 | #define HAVE_BATS 1 |
46 | #endif | |
47 | ||
48 | #if defined(CONFIG_FSL_BOOKE) | |
49 | #define HAVE_TLBCAM 1 | |
50 | #endif | |
51 | ||
52 | extern char etext[], _stext[]; | |
53 | ||
14cf11af | 54 | #ifdef HAVE_BATS |
7c5c4325 BB |
55 | extern phys_addr_t v_mapped_by_bats(unsigned long va); |
56 | extern unsigned long p_mapped_by_bats(phys_addr_t pa); | |
14cf11af PM |
57 | #else /* !HAVE_BATS */ |
58 | #define v_mapped_by_bats(x) (0UL) | |
59 | #define p_mapped_by_bats(x) (0UL) | |
60 | #endif /* HAVE_BATS */ | |
61 | ||
62 | #ifdef HAVE_TLBCAM | |
6c24b174 KG |
63 | extern phys_addr_t v_mapped_by_tlbcam(unsigned long va); |
64 | extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa); | |
14cf11af PM |
65 | #else /* !HAVE_TLBCAM */ |
66 | #define v_mapped_by_tlbcam(x) (0UL) | |
67 | #define p_mapped_by_tlbcam(x) (0UL) | |
68 | #endif /* HAVE_TLBCAM */ | |
69 | ||
ca9153a3 | 70 | #define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) |
14cf11af | 71 | |
ce67f5d0 LC |
72 | #ifndef CONFIG_PPC_4K_PAGES |
73 | static struct kmem_cache *pgtable_cache; | |
74 | ||
75 | void pgtable_cache_init(void) | |
76 | { | |
77 | pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER, | |
78 | 1 << PGDIR_ORDER, 0, NULL); | |
79 | if (pgtable_cache == NULL) | |
80 | panic("Couldn't allocate pgtable caches"); | |
81 | } | |
82 | #endif | |
83 | ||
14cf11af PM |
84 | pgd_t *pgd_alloc(struct mm_struct *mm) |
85 | { | |
86 | pgd_t *ret; | |
87 | ||
ca9153a3 IY |
88 | /* pgdir take page or two with 4K pages and a page fraction otherwise */ |
89 | #ifndef CONFIG_PPC_4K_PAGES | |
ce67f5d0 | 90 | ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO); |
ca9153a3 IY |
91 | #else |
92 | ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, | |
93 | PGDIR_ORDER - PAGE_SHIFT); | |
94 | #endif | |
14cf11af PM |
95 | return ret; |
96 | } | |
97 | ||
5e541973 | 98 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
14cf11af | 99 | { |
ca9153a3 | 100 | #ifndef CONFIG_PPC_4K_PAGES |
ce67f5d0 | 101 | kmem_cache_free(pgtable_cache, (void *)pgd); |
ca9153a3 IY |
102 | #else |
103 | free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); | |
104 | #endif | |
14cf11af PM |
105 | } |
106 | ||
f1aed924 | 107 | __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
108 | { |
109 | pte_t *pte; | |
14cf11af | 110 | |
f691fa10 | 111 | if (slab_is_available()) { |
14cf11af PM |
112 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
113 | } else { | |
10239733 | 114 | pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
14cf11af PM |
115 | if (pte) |
116 | clear_page(pte); | |
117 | } | |
118 | return pte; | |
119 | } | |
120 | ||
2f569afd | 121 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
122 | { |
123 | struct page *ptepage; | |
124 | ||
2f569afd | 125 | gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; |
14cf11af PM |
126 | |
127 | ptepage = alloc_pages(flags, 0); | |
2f569afd MS |
128 | if (!ptepage) |
129 | return NULL; | |
4f804943 KS |
130 | if (!pgtable_page_ctor(ptepage)) { |
131 | __free_page(ptepage); | |
132 | return NULL; | |
133 | } | |
14cf11af PM |
134 | return ptepage; |
135 | } | |
136 | ||
14cf11af PM |
137 | void __iomem * |
138 | ioremap(phys_addr_t addr, unsigned long size) | |
139 | { | |
1cdab55d BH |
140 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED, |
141 | __builtin_return_address(0)); | |
14cf11af | 142 | } |
920573bd | 143 | EXPORT_SYMBOL(ioremap); |
14cf11af | 144 | |
be135f40 AB |
145 | void __iomem * |
146 | ioremap_wc(phys_addr_t addr, unsigned long size) | |
147 | { | |
148 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE, | |
149 | __builtin_return_address(0)); | |
150 | } | |
151 | EXPORT_SYMBOL(ioremap_wc); | |
152 | ||
68a64357 | 153 | void __iomem * |
40f1ce7f | 154 | ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) |
68a64357 | 155 | { |
a1f242ff | 156 | /* writeable implies dirty for kernel addresses */ |
a7b9f671 | 157 | if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO) |
a1f242ff BH |
158 | flags |= _PAGE_DIRTY | _PAGE_HWWRITE; |
159 | ||
160 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
ea3cc330 | 161 | flags &= ~(_PAGE_USER | _PAGE_EXEC); |
a1f242ff | 162 | |
55052eec BH |
163 | #ifdef _PAGE_BAP_SR |
164 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format | |
165 | * which means that we just cleared supervisor access... oops ;-) This | |
166 | * restores it | |
167 | */ | |
168 | flags |= _PAGE_BAP_SR; | |
169 | #endif | |
170 | ||
1cdab55d | 171 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
68a64357 | 172 | } |
40f1ce7f | 173 | EXPORT_SYMBOL(ioremap_prot); |
68a64357 | 174 | |
14cf11af PM |
175 | void __iomem * |
176 | __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) | |
1cdab55d BH |
177 | { |
178 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
179 | } | |
180 | ||
181 | void __iomem * | |
182 | __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags, | |
183 | void *caller) | |
14cf11af PM |
184 | { |
185 | unsigned long v, i; | |
186 | phys_addr_t p; | |
187 | int err; | |
188 | ||
a1f242ff BH |
189 | /* Make sure we have the base flags */ |
190 | if ((flags & _PAGE_PRESENT) == 0) | |
4f9c53c8 | 191 | flags |= pgprot_val(PAGE_KERNEL); |
a1f242ff BH |
192 | |
193 | /* Non-cacheable page cannot be coherent */ | |
194 | if (flags & _PAGE_NO_CACHE) | |
195 | flags &= ~_PAGE_COHERENT; | |
196 | ||
14cf11af PM |
197 | /* |
198 | * Choose an address to map it to. | |
199 | * Once the vmalloc system is running, we use it. | |
200 | * Before then, we use space going down from ioremap_base | |
201 | * (ioremap_bot records where we're up to). | |
202 | */ | |
203 | p = addr & PAGE_MASK; | |
204 | size = PAGE_ALIGN(addr + size) - p; | |
205 | ||
206 | /* | |
207 | * If the address lies within the first 16 MB, assume it's in ISA | |
208 | * memory space | |
209 | */ | |
210 | if (p < 16*1024*1024) | |
211 | p += _ISA_MEM_BASE; | |
212 | ||
01695a96 | 213 | #ifndef CONFIG_CRASH_DUMP |
14cf11af PM |
214 | /* |
215 | * Don't allow anybody to remap normal RAM that we're using. | |
216 | * mem_init() sets high_memory so only do the check after that. | |
217 | */ | |
f691fa10 | 218 | if (slab_is_available() && (p < virt_to_phys(high_memory)) && |
95f72d1e | 219 | !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { |
cc83458d | 220 | printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n", |
37f01d64 | 221 | (unsigned long long)p, __builtin_return_address(0)); |
14cf11af PM |
222 | return NULL; |
223 | } | |
01695a96 | 224 | #endif |
14cf11af PM |
225 | |
226 | if (size == 0) | |
227 | return NULL; | |
228 | ||
229 | /* | |
230 | * Is it already mapped? Perhaps overlapped by a previous | |
231 | * BAT mapping. If the whole area is mapped then we're done, | |
232 | * otherwise remap it since we want to keep the virt addrs for | |
233 | * each request contiguous. | |
234 | * | |
235 | * We make the assumption here that if the bottom and top | |
236 | * of the range we want are mapped then it's mapped to the | |
237 | * same virt address (and this is contiguous). | |
238 | * -- Cort | |
239 | */ | |
240 | if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) | |
241 | goto out; | |
242 | ||
243 | if ((v = p_mapped_by_tlbcam(p))) | |
244 | goto out; | |
245 | ||
f691fa10 | 246 | if (slab_is_available()) { |
14cf11af | 247 | struct vm_struct *area; |
1cdab55d | 248 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
14cf11af PM |
249 | if (area == 0) |
250 | return NULL; | |
7a9d1256 | 251 | area->phys_addr = p; |
14cf11af PM |
252 | v = (unsigned long) area->addr; |
253 | } else { | |
254 | v = (ioremap_bot -= size); | |
255 | } | |
256 | ||
14cf11af PM |
257 | /* |
258 | * Should check if it is a candidate for a BAT mapping | |
259 | */ | |
260 | ||
261 | err = 0; | |
262 | for (i = 0; i < size && err == 0; i += PAGE_SIZE) | |
263 | err = map_page(v+i, p+i, flags); | |
264 | if (err) { | |
f691fa10 | 265 | if (slab_is_available()) |
14cf11af PM |
266 | vunmap((void *)v); |
267 | return NULL; | |
268 | } | |
269 | ||
270 | out: | |
271 | return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); | |
272 | } | |
920573bd | 273 | EXPORT_SYMBOL(__ioremap); |
14cf11af PM |
274 | |
275 | void iounmap(volatile void __iomem *addr) | |
276 | { | |
277 | /* | |
278 | * If mapped by BATs then there is nothing to do. | |
279 | * Calling vfree() generates a benign warning. | |
280 | */ | |
281 | if (v_mapped_by_bats((unsigned long)addr)) return; | |
282 | ||
283 | if (addr > high_memory && (unsigned long) addr < ioremap_bot) | |
284 | vunmap((void *) (PAGE_MASK & (unsigned long)addr)); | |
285 | } | |
920573bd | 286 | EXPORT_SYMBOL(iounmap); |
14cf11af | 287 | |
68a64357 | 288 | int map_page(unsigned long va, phys_addr_t pa, int flags) |
14cf11af PM |
289 | { |
290 | pmd_t *pd; | |
291 | pte_t *pg; | |
292 | int err = -ENOMEM; | |
293 | ||
14cf11af | 294 | /* Use upper 10 bits of VA to index the first level map */ |
d1953c88 | 295 | pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); |
14cf11af | 296 | /* Use middle 10 bits of VA to index the second-level map */ |
e2f2e58e | 297 | pg = pte_alloc_kernel(pd, va); |
14cf11af PM |
298 | if (pg != 0) { |
299 | err = 0; | |
3be4e699 BH |
300 | /* The PTE should never be already set nor present in the |
301 | * hash table | |
302 | */ | |
7021d86a AV |
303 | BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) && |
304 | flags); | |
3be4e699 BH |
305 | set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, |
306 | __pgprot(flags))); | |
14cf11af | 307 | } |
47ce8af4 | 308 | smp_wmb(); |
14cf11af PM |
309 | return err; |
310 | } | |
311 | ||
312 | /* | |
de32400d | 313 | * Map in a chunk of physical memory starting at start. |
14cf11af | 314 | */ |
de32400d | 315 | void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) |
14cf11af | 316 | { |
99c62dd7 KG |
317 | unsigned long v, s, f; |
318 | phys_addr_t p; | |
ee4f2ea4 | 319 | int ktext; |
14cf11af | 320 | |
de32400d | 321 | s = offset; |
ccdcef72 | 322 | v = PAGE_OFFSET + s; |
99c62dd7 | 323 | p = memstart_addr + s; |
de32400d | 324 | for (; s < top; s += PAGE_SIZE) { |
ee4f2ea4 | 325 | ktext = ((char *) v >= _stext && (char *) v < etext); |
4f9c53c8 | 326 | f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL); |
14cf11af | 327 | map_page(v, p, f); |
ee4f2ea4 BH |
328 | #ifdef CONFIG_PPC_STD_MMU_32 |
329 | if (ktext) | |
330 | hash_preload(&init_mm, v, 0, 0x300); | |
331 | #endif | |
14cf11af PM |
332 | v += PAGE_SIZE; |
333 | p += PAGE_SIZE; | |
334 | } | |
335 | } | |
336 | ||
de32400d AH |
337 | void __init mapin_ram(void) |
338 | { | |
339 | unsigned long s, top; | |
340 | ||
341 | #ifndef CONFIG_WII | |
342 | top = total_lowmem; | |
343 | s = mmu_mapin_ram(top); | |
344 | __mapin_ram_chunk(s, top); | |
345 | #else | |
346 | if (!wii_hole_size) { | |
347 | s = mmu_mapin_ram(total_lowmem); | |
348 | __mapin_ram_chunk(s, total_lowmem); | |
349 | } else { | |
350 | top = wii_hole_start; | |
351 | s = mmu_mapin_ram(top); | |
352 | __mapin_ram_chunk(s, top); | |
353 | ||
95f72d1e | 354 | top = memblock_end_of_DRAM(); |
de32400d AH |
355 | s = wii_mmu_mapin_mem2(top); |
356 | __mapin_ram_chunk(s, top); | |
357 | } | |
358 | #endif | |
359 | } | |
360 | ||
14cf11af PM |
361 | /* Scan the real Linux page tables and return a PTE pointer for |
362 | * a virtual address in a context. | |
363 | * Returns true (1) if PTE was found, zero otherwise. The pointer to | |
364 | * the PTE pointer is unmodified if PTE is not found. | |
365 | */ | |
366 | int | |
bab70a4a | 367 | get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) |
14cf11af PM |
368 | { |
369 | pgd_t *pgd; | |
d1953c88 | 370 | pud_t *pud; |
14cf11af PM |
371 | pmd_t *pmd; |
372 | pte_t *pte; | |
373 | int retval = 0; | |
374 | ||
375 | pgd = pgd_offset(mm, addr & PAGE_MASK); | |
376 | if (pgd) { | |
d1953c88 DG |
377 | pud = pud_offset(pgd, addr & PAGE_MASK); |
378 | if (pud && pud_present(*pud)) { | |
379 | pmd = pmd_offset(pud, addr & PAGE_MASK); | |
380 | if (pmd_present(*pmd)) { | |
381 | pte = pte_offset_map(pmd, addr & PAGE_MASK); | |
382 | if (pte) { | |
383 | retval = 1; | |
384 | *ptep = pte; | |
385 | if (pmdp) | |
386 | *pmdp = pmd; | |
387 | /* XXX caller needs to do pte_unmap, yuck */ | |
388 | } | |
389 | } | |
390 | } | |
14cf11af PM |
391 | } |
392 | return(retval); | |
393 | } | |
394 | ||
88df6e90 BH |
395 | #ifdef CONFIG_DEBUG_PAGEALLOC |
396 | ||
397 | static int __change_page_attr(struct page *page, pgprot_t prot) | |
398 | { | |
399 | pte_t *kpte; | |
400 | pmd_t *kpmd; | |
401 | unsigned long address; | |
402 | ||
403 | BUG_ON(PageHighMem(page)); | |
404 | address = (unsigned long)page_address(page); | |
405 | ||
406 | if (v_mapped_by_bats(address) || v_mapped_by_tlbcam(address)) | |
407 | return 0; | |
408 | if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) | |
409 | return -EINVAL; | |
50891457 | 410 | __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); |
88df6e90 | 411 | wmb(); |
f63837f0 | 412 | flush_tlb_page(NULL, address); |
88df6e90 BH |
413 | pte_unmap(kpte); |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Change the page attributes of an page in the linear mapping. | |
420 | * | |
421 | * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY | |
422 | */ | |
423 | static int change_page_attr(struct page *page, int numpages, pgprot_t prot) | |
424 | { | |
425 | int i, err = 0; | |
426 | unsigned long flags; | |
427 | ||
428 | local_irq_save(flags); | |
429 | for (i = 0; i < numpages; i++, page++) { | |
430 | err = __change_page_attr(page, prot); | |
431 | if (err) | |
432 | break; | |
433 | } | |
434 | local_irq_restore(flags); | |
435 | return err; | |
436 | } | |
437 | ||
438 | ||
031bc574 | 439 | void __kernel_map_pages(struct page *page, int numpages, int enable) |
88df6e90 BH |
440 | { |
441 | if (PageHighMem(page)) | |
442 | return; | |
443 | ||
444 | change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); | |
445 | } | |
446 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2c419bde KG |
447 | |
448 | static int fixmaps; | |
2c419bde KG |
449 | |
450 | void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) | |
451 | { | |
452 | unsigned long address = __fix_to_virt(idx); | |
453 | ||
454 | if (idx >= __end_of_fixed_addresses) { | |
455 | BUG(); | |
456 | return; | |
457 | } | |
458 | ||
46a74179 | 459 | map_page(address, phys, pgprot_val(flags)); |
2c419bde KG |
460 | fixmaps++; |
461 | } | |
462 | ||
463 | void __this_fixmap_does_not_exist(void) | |
464 | { | |
465 | WARN_ON(1); | |
466 | } |