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); | |
57 | void setbat(int index, unsigned long virt, phys_addr_t phys, | |
14cf11af PM |
58 | unsigned int size, int flags); |
59 | ||
60 | #else /* !HAVE_BATS */ | |
61 | #define v_mapped_by_bats(x) (0UL) | |
62 | #define p_mapped_by_bats(x) (0UL) | |
63 | #endif /* HAVE_BATS */ | |
64 | ||
65 | #ifdef HAVE_TLBCAM | |
6c24b174 KG |
66 | extern phys_addr_t v_mapped_by_tlbcam(unsigned long va); |
67 | extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa); | |
14cf11af PM |
68 | #else /* !HAVE_TLBCAM */ |
69 | #define v_mapped_by_tlbcam(x) (0UL) | |
70 | #define p_mapped_by_tlbcam(x) (0UL) | |
71 | #endif /* HAVE_TLBCAM */ | |
72 | ||
ca9153a3 | 73 | #define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT) |
14cf11af PM |
74 | |
75 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
76 | { | |
77 | pgd_t *ret; | |
78 | ||
ca9153a3 IY |
79 | /* pgdir take page or two with 4K pages and a page fraction otherwise */ |
80 | #ifndef CONFIG_PPC_4K_PAGES | |
ae9fd31a | 81 | ret = kzalloc(1 << PGDIR_ORDER, GFP_KERNEL); |
ca9153a3 IY |
82 | #else |
83 | ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, | |
84 | PGDIR_ORDER - PAGE_SHIFT); | |
85 | #endif | |
14cf11af PM |
86 | return ret; |
87 | } | |
88 | ||
5e541973 | 89 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
14cf11af | 90 | { |
ca9153a3 IY |
91 | #ifndef CONFIG_PPC_4K_PAGES |
92 | kfree((void *)pgd); | |
93 | #else | |
94 | free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT); | |
95 | #endif | |
14cf11af PM |
96 | } |
97 | ||
f1aed924 | 98 | __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
99 | { |
100 | pte_t *pte; | |
101 | extern int mem_init_done; | |
14cf11af PM |
102 | |
103 | if (mem_init_done) { | |
104 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
105 | } else { | |
10239733 | 106 | pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE)); |
14cf11af PM |
107 | if (pte) |
108 | clear_page(pte); | |
109 | } | |
110 | return pte; | |
111 | } | |
112 | ||
2f569afd | 113 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
114 | { |
115 | struct page *ptepage; | |
116 | ||
2f569afd | 117 | gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; |
14cf11af PM |
118 | |
119 | ptepage = alloc_pages(flags, 0); | |
2f569afd MS |
120 | if (!ptepage) |
121 | return NULL; | |
4f804943 KS |
122 | if (!pgtable_page_ctor(ptepage)) { |
123 | __free_page(ptepage); | |
124 | return NULL; | |
125 | } | |
14cf11af PM |
126 | return ptepage; |
127 | } | |
128 | ||
14cf11af PM |
129 | void __iomem * |
130 | ioremap(phys_addr_t addr, unsigned long size) | |
131 | { | |
1cdab55d BH |
132 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED, |
133 | __builtin_return_address(0)); | |
14cf11af | 134 | } |
920573bd | 135 | EXPORT_SYMBOL(ioremap); |
14cf11af | 136 | |
be135f40 AB |
137 | void __iomem * |
138 | ioremap_wc(phys_addr_t addr, unsigned long size) | |
139 | { | |
140 | return __ioremap_caller(addr, size, _PAGE_NO_CACHE, | |
141 | __builtin_return_address(0)); | |
142 | } | |
143 | EXPORT_SYMBOL(ioremap_wc); | |
144 | ||
68a64357 | 145 | void __iomem * |
40f1ce7f | 146 | ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags) |
68a64357 | 147 | { |
a1f242ff BH |
148 | /* writeable implies dirty for kernel addresses */ |
149 | if (flags & _PAGE_RW) | |
150 | flags |= _PAGE_DIRTY | _PAGE_HWWRITE; | |
151 | ||
152 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
ea3cc330 | 153 | flags &= ~(_PAGE_USER | _PAGE_EXEC); |
a1f242ff | 154 | |
55052eec BH |
155 | #ifdef _PAGE_BAP_SR |
156 | /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format | |
157 | * which means that we just cleared supervisor access... oops ;-) This | |
158 | * restores it | |
159 | */ | |
160 | flags |= _PAGE_BAP_SR; | |
161 | #endif | |
162 | ||
1cdab55d | 163 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); |
68a64357 | 164 | } |
40f1ce7f | 165 | EXPORT_SYMBOL(ioremap_prot); |
68a64357 | 166 | |
14cf11af PM |
167 | void __iomem * |
168 | __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) | |
1cdab55d BH |
169 | { |
170 | return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); | |
171 | } | |
172 | ||
173 | void __iomem * | |
174 | __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags, | |
175 | void *caller) | |
14cf11af PM |
176 | { |
177 | unsigned long v, i; | |
178 | phys_addr_t p; | |
179 | int err; | |
180 | ||
a1f242ff BH |
181 | /* Make sure we have the base flags */ |
182 | if ((flags & _PAGE_PRESENT) == 0) | |
8d1cf34e | 183 | flags |= PAGE_KERNEL; |
a1f242ff BH |
184 | |
185 | /* Non-cacheable page cannot be coherent */ | |
186 | if (flags & _PAGE_NO_CACHE) | |
187 | flags &= ~_PAGE_COHERENT; | |
188 | ||
14cf11af PM |
189 | /* |
190 | * Choose an address to map it to. | |
191 | * Once the vmalloc system is running, we use it. | |
192 | * Before then, we use space going down from ioremap_base | |
193 | * (ioremap_bot records where we're up to). | |
194 | */ | |
195 | p = addr & PAGE_MASK; | |
196 | size = PAGE_ALIGN(addr + size) - p; | |
197 | ||
198 | /* | |
199 | * If the address lies within the first 16 MB, assume it's in ISA | |
200 | * memory space | |
201 | */ | |
202 | if (p < 16*1024*1024) | |
203 | p += _ISA_MEM_BASE; | |
204 | ||
01695a96 | 205 | #ifndef CONFIG_CRASH_DUMP |
14cf11af PM |
206 | /* |
207 | * Don't allow anybody to remap normal RAM that we're using. | |
208 | * mem_init() sets high_memory so only do the check after that. | |
209 | */ | |
c5df7f77 | 210 | if (mem_init_done && (p < virt_to_phys(high_memory)) && |
95f72d1e | 211 | !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { |
a2234b4b | 212 | printk("__ioremap(): phys addr 0x%llx is RAM lr %pf\n", |
37f01d64 | 213 | (unsigned long long)p, __builtin_return_address(0)); |
14cf11af PM |
214 | return NULL; |
215 | } | |
01695a96 | 216 | #endif |
14cf11af PM |
217 | |
218 | if (size == 0) | |
219 | return NULL; | |
220 | ||
221 | /* | |
222 | * Is it already mapped? Perhaps overlapped by a previous | |
223 | * BAT mapping. If the whole area is mapped then we're done, | |
224 | * otherwise remap it since we want to keep the virt addrs for | |
225 | * each request contiguous. | |
226 | * | |
227 | * We make the assumption here that if the bottom and top | |
228 | * of the range we want are mapped then it's mapped to the | |
229 | * same virt address (and this is contiguous). | |
230 | * -- Cort | |
231 | */ | |
232 | if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) | |
233 | goto out; | |
234 | ||
235 | if ((v = p_mapped_by_tlbcam(p))) | |
236 | goto out; | |
237 | ||
238 | if (mem_init_done) { | |
239 | struct vm_struct *area; | |
1cdab55d | 240 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
14cf11af PM |
241 | if (area == 0) |
242 | return NULL; | |
7a9d1256 | 243 | area->phys_addr = p; |
14cf11af PM |
244 | v = (unsigned long) area->addr; |
245 | } else { | |
246 | v = (ioremap_bot -= size); | |
247 | } | |
248 | ||
14cf11af PM |
249 | /* |
250 | * Should check if it is a candidate for a BAT mapping | |
251 | */ | |
252 | ||
253 | err = 0; | |
254 | for (i = 0; i < size && err == 0; i += PAGE_SIZE) | |
255 | err = map_page(v+i, p+i, flags); | |
256 | if (err) { | |
257 | if (mem_init_done) | |
258 | vunmap((void *)v); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | out: | |
263 | return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); | |
264 | } | |
920573bd | 265 | EXPORT_SYMBOL(__ioremap); |
14cf11af PM |
266 | |
267 | void iounmap(volatile void __iomem *addr) | |
268 | { | |
269 | /* | |
270 | * If mapped by BATs then there is nothing to do. | |
271 | * Calling vfree() generates a benign warning. | |
272 | */ | |
273 | if (v_mapped_by_bats((unsigned long)addr)) return; | |
274 | ||
275 | if (addr > high_memory && (unsigned long) addr < ioremap_bot) | |
276 | vunmap((void *) (PAGE_MASK & (unsigned long)addr)); | |
277 | } | |
920573bd | 278 | EXPORT_SYMBOL(iounmap); |
14cf11af | 279 | |
68a64357 | 280 | int map_page(unsigned long va, phys_addr_t pa, int flags) |
14cf11af PM |
281 | { |
282 | pmd_t *pd; | |
283 | pte_t *pg; | |
284 | int err = -ENOMEM; | |
285 | ||
14cf11af | 286 | /* Use upper 10 bits of VA to index the first level map */ |
d1953c88 | 287 | pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); |
14cf11af | 288 | /* Use middle 10 bits of VA to index the second-level map */ |
e2f2e58e | 289 | pg = pte_alloc_kernel(pd, va); |
14cf11af PM |
290 | if (pg != 0) { |
291 | err = 0; | |
3be4e699 BH |
292 | /* The PTE should never be already set nor present in the |
293 | * hash table | |
294 | */ | |
7021d86a AV |
295 | BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) && |
296 | flags); | |
3be4e699 BH |
297 | set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, |
298 | __pgprot(flags))); | |
14cf11af | 299 | } |
47ce8af4 | 300 | smp_wmb(); |
14cf11af PM |
301 | return err; |
302 | } | |
303 | ||
304 | /* | |
de32400d | 305 | * Map in a chunk of physical memory starting at start. |
14cf11af | 306 | */ |
de32400d | 307 | void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) |
14cf11af | 308 | { |
99c62dd7 KG |
309 | unsigned long v, s, f; |
310 | phys_addr_t p; | |
ee4f2ea4 | 311 | int ktext; |
14cf11af | 312 | |
de32400d | 313 | s = offset; |
ccdcef72 | 314 | v = PAGE_OFFSET + s; |
99c62dd7 | 315 | p = memstart_addr + s; |
de32400d | 316 | for (; s < top; s += PAGE_SIZE) { |
ee4f2ea4 | 317 | ktext = ((char *) v >= _stext && (char *) v < etext); |
8d1cf34e | 318 | f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL; |
14cf11af | 319 | map_page(v, p, f); |
ee4f2ea4 BH |
320 | #ifdef CONFIG_PPC_STD_MMU_32 |
321 | if (ktext) | |
322 | hash_preload(&init_mm, v, 0, 0x300); | |
323 | #endif | |
14cf11af PM |
324 | v += PAGE_SIZE; |
325 | p += PAGE_SIZE; | |
326 | } | |
327 | } | |
328 | ||
de32400d AH |
329 | void __init mapin_ram(void) |
330 | { | |
331 | unsigned long s, top; | |
332 | ||
333 | #ifndef CONFIG_WII | |
334 | top = total_lowmem; | |
335 | s = mmu_mapin_ram(top); | |
336 | __mapin_ram_chunk(s, top); | |
337 | #else | |
338 | if (!wii_hole_size) { | |
339 | s = mmu_mapin_ram(total_lowmem); | |
340 | __mapin_ram_chunk(s, total_lowmem); | |
341 | } else { | |
342 | top = wii_hole_start; | |
343 | s = mmu_mapin_ram(top); | |
344 | __mapin_ram_chunk(s, top); | |
345 | ||
95f72d1e | 346 | top = memblock_end_of_DRAM(); |
de32400d AH |
347 | s = wii_mmu_mapin_mem2(top); |
348 | __mapin_ram_chunk(s, top); | |
349 | } | |
350 | #endif | |
351 | } | |
352 | ||
14cf11af PM |
353 | /* Scan the real Linux page tables and return a PTE pointer for |
354 | * a virtual address in a context. | |
355 | * Returns true (1) if PTE was found, zero otherwise. The pointer to | |
356 | * the PTE pointer is unmodified if PTE is not found. | |
357 | */ | |
358 | int | |
bab70a4a | 359 | get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) |
14cf11af PM |
360 | { |
361 | pgd_t *pgd; | |
d1953c88 | 362 | pud_t *pud; |
14cf11af PM |
363 | pmd_t *pmd; |
364 | pte_t *pte; | |
365 | int retval = 0; | |
366 | ||
367 | pgd = pgd_offset(mm, addr & PAGE_MASK); | |
368 | if (pgd) { | |
d1953c88 DG |
369 | pud = pud_offset(pgd, addr & PAGE_MASK); |
370 | if (pud && pud_present(*pud)) { | |
371 | pmd = pmd_offset(pud, addr & PAGE_MASK); | |
372 | if (pmd_present(*pmd)) { | |
373 | pte = pte_offset_map(pmd, addr & PAGE_MASK); | |
374 | if (pte) { | |
375 | retval = 1; | |
376 | *ptep = pte; | |
377 | if (pmdp) | |
378 | *pmdp = pmd; | |
379 | /* XXX caller needs to do pte_unmap, yuck */ | |
380 | } | |
381 | } | |
382 | } | |
14cf11af PM |
383 | } |
384 | return(retval); | |
385 | } | |
386 | ||
88df6e90 BH |
387 | #ifdef CONFIG_DEBUG_PAGEALLOC |
388 | ||
389 | static int __change_page_attr(struct page *page, pgprot_t prot) | |
390 | { | |
391 | pte_t *kpte; | |
392 | pmd_t *kpmd; | |
393 | unsigned long address; | |
394 | ||
395 | BUG_ON(PageHighMem(page)); | |
396 | address = (unsigned long)page_address(page); | |
397 | ||
398 | if (v_mapped_by_bats(address) || v_mapped_by_tlbcam(address)) | |
399 | return 0; | |
400 | if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) | |
401 | return -EINVAL; | |
50891457 | 402 | __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); |
88df6e90 | 403 | wmb(); |
f63837f0 | 404 | flush_tlb_page(NULL, address); |
88df6e90 BH |
405 | pte_unmap(kpte); |
406 | ||
407 | return 0; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Change the page attributes of an page in the linear mapping. | |
412 | * | |
413 | * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY | |
414 | */ | |
415 | static int change_page_attr(struct page *page, int numpages, pgprot_t prot) | |
416 | { | |
417 | int i, err = 0; | |
418 | unsigned long flags; | |
419 | ||
420 | local_irq_save(flags); | |
421 | for (i = 0; i < numpages; i++, page++) { | |
422 | err = __change_page_attr(page, prot); | |
423 | if (err) | |
424 | break; | |
425 | } | |
426 | local_irq_restore(flags); | |
427 | return err; | |
428 | } | |
429 | ||
430 | ||
031bc574 | 431 | void __kernel_map_pages(struct page *page, int numpages, int enable) |
88df6e90 BH |
432 | { |
433 | if (PageHighMem(page)) | |
434 | return; | |
435 | ||
436 | change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); | |
437 | } | |
438 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2c419bde KG |
439 | |
440 | static int fixmaps; | |
2c419bde KG |
441 | |
442 | void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) | |
443 | { | |
444 | unsigned long address = __fix_to_virt(idx); | |
445 | ||
446 | if (idx >= __end_of_fixed_addresses) { | |
447 | BUG(); | |
448 | return; | |
449 | } | |
450 | ||
46a74179 | 451 | map_page(address, phys, pgprot_val(flags)); |
2c419bde KG |
452 | fixmaps++; |
453 | } | |
454 | ||
455 | void __this_fixmap_does_not_exist(void) | |
456 | { | |
457 | WARN_ON(1); | |
458 | } |