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 | ||
14cf11af | 40 | unsigned long ioremap_bot; |
920573bd | 41 | EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ |
14cf11af | 42 | |
060ef9d8 | 43 | extern char etext[], _stext[], _sinittext[], _einittext[]; |
14cf11af | 44 | |
ca9153a3 | 45 | #define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) |
14cf11af | 46 | |
ce67f5d0 LC |
47 | #ifndef CONFIG_PPC_4K_PAGES |
48 | static struct kmem_cache *pgtable_cache; | |
49 | ||
50 | void pgtable_cache_init(void) | |
51 | { | |
52 | pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER, | |
53 | 1 << PGDIR_ORDER, 0, NULL); | |
54 | if (pgtable_cache == NULL) | |
55 | panic("Couldn't allocate pgtable caches"); | |
56 | } | |
57 | #endif | |
58 | ||
14cf11af PM |
59 | pgd_t *pgd_alloc(struct mm_struct *mm) |
60 | { | |
61 | pgd_t *ret; | |
62 | ||
ca9153a3 IY |
63 | /* pgdir take page or two with 4K pages and a page fraction otherwise */ |
64 | #ifndef CONFIG_PPC_4K_PAGES | |
ce67f5d0 | 65 | ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO); |
ca9153a3 IY |
66 | #else |
67 | ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, | |
68 | PGDIR_ORDER - PAGE_SHIFT); | |
69 | #endif | |
14cf11af PM |
70 | return ret; |
71 | } | |
72 | ||
5e541973 | 73 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
14cf11af | 74 | { |
ca9153a3 | 75 | #ifndef CONFIG_PPC_4K_PAGES |
ce67f5d0 | 76 | kmem_cache_free(pgtable_cache, (void *)pgd); |
ca9153a3 IY |
77 | #else |
78 | free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); | |
79 | #endif | |
14cf11af PM |
80 | } |
81 | ||
bd721ea7 | 82 | __ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
83 | { |
84 | pte_t *pte; | |
14cf11af | 85 | |
f691fa10 | 86 | if (slab_is_available()) { |
32d6bd90 | 87 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO); |
14cf11af | 88 | } else { |
10239733 | 89 | pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
14cf11af PM |
90 | if (pte) |
91 | clear_page(pte); | |
92 | } | |
93 | return pte; | |
94 | } | |
95 | ||
2f569afd | 96 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
97 | { |
98 | struct page *ptepage; | |
99 | ||
32d6bd90 | 100 | gfp_t flags = GFP_KERNEL | __GFP_ZERO; |
14cf11af PM |
101 | |
102 | ptepage = alloc_pages(flags, 0); | |
2f569afd MS |
103 | if (!ptepage) |
104 | return NULL; | |
4f804943 KS |
105 | if (!pgtable_page_ctor(ptepage)) { |
106 | __free_page(ptepage); | |
107 | return NULL; | |
108 | } | |
14cf11af PM |
109 | return ptepage; |
110 | } | |
111 | ||
14cf11af PM |
112 | void __iomem * |
113 | ioremap(phys_addr_t addr, unsigned long size) | |
114 | { | |
1cdab55d BH |
115 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED, |
116 | __builtin_return_address(0)); | |
14cf11af | 117 | } |
920573bd | 118 | EXPORT_SYMBOL(ioremap); |
14cf11af | 119 | |
be135f40 AB |
120 | void __iomem * |
121 | ioremap_wc(phys_addr_t addr, unsigned long size) | |
122 | { | |
123 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE, | |
124 | __builtin_return_address(0)); | |
125 | } | |
126 | EXPORT_SYMBOL(ioremap_wc); | |
127 | ||
68a64357 | 128 | void __iomem * |
40f1ce7f | 129 | ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) |
68a64357 | 130 | { |
a1f242ff | 131 | /* writeable implies dirty for kernel addresses */ |
a7b9f671 | 132 | if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO) |
a1f242ff BH |
133 | flags |= _PAGE_DIRTY | _PAGE_HWWRITE; |
134 | ||
135 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
ea3cc330 | 136 | flags &= ~(_PAGE_USER | _PAGE_EXEC); |
a1f242ff | 137 | |
55052eec BH |
138 | #ifdef _PAGE_BAP_SR |
139 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format | |
140 | * which means that we just cleared supervisor access... oops ;-) This | |
141 | * restores it | |
142 | */ | |
143 | flags |= _PAGE_BAP_SR; | |
144 | #endif | |
145 | ||
1cdab55d | 146 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
68a64357 | 147 | } |
40f1ce7f | 148 | EXPORT_SYMBOL(ioremap_prot); |
68a64357 | 149 | |
14cf11af PM |
150 | void __iomem * |
151 | __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) | |
1cdab55d BH |
152 | { |
153 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
154 | } | |
155 | ||
156 | void __iomem * | |
157 | __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags, | |
158 | void *caller) | |
14cf11af PM |
159 | { |
160 | unsigned long v, i; | |
161 | phys_addr_t p; | |
162 | int err; | |
163 | ||
a1f242ff BH |
164 | /* Make sure we have the base flags */ |
165 | if ((flags & _PAGE_PRESENT) == 0) | |
4f9c53c8 | 166 | flags |= pgprot_val(PAGE_KERNEL); |
a1f242ff BH |
167 | |
168 | /* Non-cacheable page cannot be coherent */ | |
169 | if (flags & _PAGE_NO_CACHE) | |
170 | flags &= ~_PAGE_COHERENT; | |
171 | ||
14cf11af PM |
172 | /* |
173 | * Choose an address to map it to. | |
174 | * Once the vmalloc system is running, we use it. | |
e974cd4b | 175 | * Before then, we use space going down from IOREMAP_TOP |
14cf11af PM |
176 | * (ioremap_bot records where we're up to). |
177 | */ | |
178 | p = addr & PAGE_MASK; | |
179 | size = PAGE_ALIGN(addr + size) - p; | |
180 | ||
181 | /* | |
182 | * If the address lies within the first 16 MB, assume it's in ISA | |
183 | * memory space | |
184 | */ | |
185 | if (p < 16*1024*1024) | |
186 | p += _ISA_MEM_BASE; | |
187 | ||
01695a96 | 188 | #ifndef CONFIG_CRASH_DUMP |
14cf11af PM |
189 | /* |
190 | * Don't allow anybody to remap normal RAM that we're using. | |
191 | * mem_init() sets high_memory so only do the check after that. | |
192 | */ | |
f691fa10 | 193 | if (slab_is_available() && (p < virt_to_phys(high_memory)) && |
95f72d1e | 194 | !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { |
cc83458d | 195 | printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n", |
37f01d64 | 196 | (unsigned long long)p, __builtin_return_address(0)); |
14cf11af PM |
197 | return NULL; |
198 | } | |
01695a96 | 199 | #endif |
14cf11af PM |
200 | |
201 | if (size == 0) | |
202 | return NULL; | |
203 | ||
204 | /* | |
205 | * Is it already mapped? Perhaps overlapped by a previous | |
3084cdb7 | 206 | * mapping. |
14cf11af | 207 | */ |
3084cdb7 CL |
208 | v = p_block_mapped(p); |
209 | if (v) | |
14cf11af PM |
210 | goto out; |
211 | ||
f691fa10 | 212 | if (slab_is_available()) { |
14cf11af | 213 | struct vm_struct *area; |
1cdab55d | 214 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
14cf11af PM |
215 | if (area == 0) |
216 | return NULL; | |
7a9d1256 | 217 | area->phys_addr = p; |
14cf11af PM |
218 | v = (unsigned long) area->addr; |
219 | } else { | |
220 | v = (ioremap_bot -= size); | |
221 | } | |
222 | ||
14cf11af PM |
223 | /* |
224 | * Should check if it is a candidate for a BAT mapping | |
225 | */ | |
226 | ||
227 | err = 0; | |
228 | for (i = 0; i < size && err == 0; i += PAGE_SIZE) | |
229 | err = map_page(v+i, p+i, flags); | |
230 | if (err) { | |
f691fa10 | 231 | if (slab_is_available()) |
14cf11af PM |
232 | vunmap((void *)v); |
233 | return NULL; | |
234 | } | |
235 | ||
236 | out: | |
237 | return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); | |
238 | } | |
920573bd | 239 | EXPORT_SYMBOL(__ioremap); |
14cf11af PM |
240 | |
241 | void iounmap(volatile void __iomem *addr) | |
242 | { | |
243 | /* | |
244 | * If mapped by BATs then there is nothing to do. | |
245 | * Calling vfree() generates a benign warning. | |
246 | */ | |
3084cdb7 CL |
247 | if (v_block_mapped((unsigned long)addr)) |
248 | return; | |
14cf11af PM |
249 | |
250 | if (addr > high_memory && (unsigned long) addr < ioremap_bot) | |
251 | vunmap((void *) (PAGE_MASK & (unsigned long)addr)); | |
252 | } | |
920573bd | 253 | EXPORT_SYMBOL(iounmap); |
14cf11af | 254 | |
68a64357 | 255 | int map_page(unsigned long va, phys_addr_t pa, int flags) |
14cf11af PM |
256 | { |
257 | pmd_t *pd; | |
258 | pte_t *pg; | |
259 | int err = -ENOMEM; | |
260 | ||
14cf11af | 261 | /* Use upper 10 bits of VA to index the first level map */ |
d1953c88 | 262 | pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); |
14cf11af | 263 | /* Use middle 10 bits of VA to index the second-level map */ |
e2f2e58e | 264 | pg = pte_alloc_kernel(pd, va); |
14cf11af PM |
265 | if (pg != 0) { |
266 | err = 0; | |
3be4e699 BH |
267 | /* The PTE should never be already set nor present in the |
268 | * hash table | |
269 | */ | |
7021d86a AV |
270 | BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) && |
271 | flags); | |
3be4e699 BH |
272 | set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, |
273 | __pgprot(flags))); | |
14cf11af | 274 | } |
47ce8af4 | 275 | smp_wmb(); |
14cf11af PM |
276 | return err; |
277 | } | |
278 | ||
279 | /* | |
de32400d | 280 | * Map in a chunk of physical memory starting at start. |
14cf11af | 281 | */ |
de32400d | 282 | void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) |
14cf11af | 283 | { |
99c62dd7 KG |
284 | unsigned long v, s, f; |
285 | phys_addr_t p; | |
ee4f2ea4 | 286 | int ktext; |
14cf11af | 287 | |
de32400d | 288 | s = offset; |
ccdcef72 | 289 | v = PAGE_OFFSET + s; |
99c62dd7 | 290 | p = memstart_addr + s; |
de32400d | 291 | for (; s < top; s += PAGE_SIZE) { |
060ef9d8 CL |
292 | ktext = ((char *)v >= _stext && (char *)v < etext) || |
293 | ((char *)v >= _sinittext && (char *)v < _einittext); | |
4f9c53c8 | 294 | f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL); |
14cf11af | 295 | map_page(v, p, f); |
ee4f2ea4 BH |
296 | #ifdef CONFIG_PPC_STD_MMU_32 |
297 | if (ktext) | |
298 | hash_preload(&init_mm, v, 0, 0x300); | |
299 | #endif | |
14cf11af PM |
300 | v += PAGE_SIZE; |
301 | p += PAGE_SIZE; | |
302 | } | |
303 | } | |
304 | ||
de32400d AH |
305 | void __init mapin_ram(void) |
306 | { | |
307 | unsigned long s, top; | |
308 | ||
309 | #ifndef CONFIG_WII | |
310 | top = total_lowmem; | |
311 | s = mmu_mapin_ram(top); | |
312 | __mapin_ram_chunk(s, top); | |
313 | #else | |
314 | if (!wii_hole_size) { | |
315 | s = mmu_mapin_ram(total_lowmem); | |
316 | __mapin_ram_chunk(s, total_lowmem); | |
317 | } else { | |
318 | top = wii_hole_start; | |
319 | s = mmu_mapin_ram(top); | |
320 | __mapin_ram_chunk(s, top); | |
321 | ||
95f72d1e | 322 | top = memblock_end_of_DRAM(); |
de32400d AH |
323 | s = wii_mmu_mapin_mem2(top); |
324 | __mapin_ram_chunk(s, top); | |
325 | } | |
326 | #endif | |
327 | } | |
328 | ||
14cf11af PM |
329 | /* Scan the real Linux page tables and return a PTE pointer for |
330 | * a virtual address in a context. | |
331 | * Returns true (1) if PTE was found, zero otherwise. The pointer to | |
332 | * the PTE pointer is unmodified if PTE is not found. | |
333 | */ | |
334 | int | |
bab70a4a | 335 | get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) |
14cf11af PM |
336 | { |
337 | pgd_t *pgd; | |
d1953c88 | 338 | pud_t *pud; |
14cf11af PM |
339 | pmd_t *pmd; |
340 | pte_t *pte; | |
341 | int retval = 0; | |
342 | ||
343 | pgd = pgd_offset(mm, addr & PAGE_MASK); | |
344 | if (pgd) { | |
d1953c88 DG |
345 | pud = pud_offset(pgd, addr & PAGE_MASK); |
346 | if (pud && pud_present(*pud)) { | |
347 | pmd = pmd_offset(pud, addr & PAGE_MASK); | |
348 | if (pmd_present(*pmd)) { | |
349 | pte = pte_offset_map(pmd, addr & PAGE_MASK); | |
350 | if (pte) { | |
351 | retval = 1; | |
352 | *ptep = pte; | |
353 | if (pmdp) | |
354 | *pmdp = pmd; | |
355 | /* XXX caller needs to do pte_unmap, yuck */ | |
356 | } | |
357 | } | |
358 | } | |
14cf11af PM |
359 | } |
360 | return(retval); | |
361 | } | |
362 | ||
88df6e90 BH |
363 | #ifdef CONFIG_DEBUG_PAGEALLOC |
364 | ||
365 | static int __change_page_attr(struct page *page, pgprot_t prot) | |
366 | { | |
367 | pte_t *kpte; | |
368 | pmd_t *kpmd; | |
369 | unsigned long address; | |
370 | ||
371 | BUG_ON(PageHighMem(page)); | |
372 | address = (unsigned long)page_address(page); | |
373 | ||
3084cdb7 | 374 | if (v_block_mapped(address)) |
88df6e90 BH |
375 | return 0; |
376 | if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) | |
377 | return -EINVAL; | |
50891457 | 378 | __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); |
88df6e90 | 379 | wmb(); |
f63837f0 | 380 | flush_tlb_page(NULL, address); |
88df6e90 BH |
381 | pte_unmap(kpte); |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /* | |
387 | * Change the page attributes of an page in the linear mapping. | |
388 | * | |
389 | * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY | |
390 | */ | |
391 | static int change_page_attr(struct page *page, int numpages, pgprot_t prot) | |
392 | { | |
393 | int i, err = 0; | |
394 | unsigned long flags; | |
395 | ||
396 | local_irq_save(flags); | |
397 | for (i = 0; i < numpages; i++, page++) { | |
398 | err = __change_page_attr(page, prot); | |
399 | if (err) | |
400 | break; | |
401 | } | |
402 | local_irq_restore(flags); | |
403 | return err; | |
404 | } | |
405 | ||
406 | ||
031bc574 | 407 | void __kernel_map_pages(struct page *page, int numpages, int enable) |
88df6e90 BH |
408 | { |
409 | if (PageHighMem(page)) | |
410 | return; | |
411 | ||
412 | change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); | |
413 | } | |
414 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2c419bde KG |
415 | |
416 | static int fixmaps; | |
2c419bde KG |
417 | |
418 | void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) | |
419 | { | |
420 | unsigned long address = __fix_to_virt(idx); | |
421 | ||
422 | if (idx >= __end_of_fixed_addresses) { | |
423 | BUG(); | |
424 | return; | |
425 | } | |
426 | ||
46a74179 | 427 | map_page(address, phys, pgprot_val(flags)); |
2c419bde KG |
428 | fixmaps++; |
429 | } | |
430 | ||
431 | void __this_fixmap_does_not_exist(void) | |
432 | { | |
433 | WARN_ON(1); | |
434 | } |