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> | |
29 | ||
30 | #include <asm/pgtable.h> | |
31 | #include <asm/pgalloc.h> | |
2c419bde | 32 | #include <asm/fixmap.h> |
14cf11af PM |
33 | #include <asm/io.h> |
34 | ||
35 | #include "mmu_decl.h" | |
36 | ||
37 | unsigned long ioremap_base; | |
38 | unsigned long ioremap_bot; | |
920573bd | 39 | EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */ |
14cf11af PM |
40 | |
41 | #if defined(CONFIG_6xx) || defined(CONFIG_POWER3) | |
42 | #define HAVE_BATS 1 | |
43 | #endif | |
44 | ||
45 | #if defined(CONFIG_FSL_BOOKE) | |
46 | #define HAVE_TLBCAM 1 | |
47 | #endif | |
48 | ||
49 | extern char etext[], _stext[]; | |
50 | ||
51 | #ifdef CONFIG_SMP | |
52 | extern void hash_page_sync(void); | |
53 | #endif | |
54 | ||
55 | #ifdef HAVE_BATS | |
7c5c4325 BB |
56 | extern phys_addr_t v_mapped_by_bats(unsigned long va); |
57 | extern unsigned long p_mapped_by_bats(phys_addr_t pa); | |
58 | void setbat(int index, unsigned long virt, phys_addr_t phys, | |
14cf11af PM |
59 | unsigned int size, int flags); |
60 | ||
61 | #else /* !HAVE_BATS */ | |
62 | #define v_mapped_by_bats(x) (0UL) | |
63 | #define p_mapped_by_bats(x) (0UL) | |
64 | #endif /* HAVE_BATS */ | |
65 | ||
66 | #ifdef HAVE_TLBCAM | |
67 | extern unsigned int tlbcam_index; | |
68 | extern unsigned long v_mapped_by_tlbcam(unsigned long va); | |
69 | extern unsigned long p_mapped_by_tlbcam(unsigned long pa); | |
70 | #else /* !HAVE_TLBCAM */ | |
71 | #define v_mapped_by_tlbcam(x) (0UL) | |
72 | #define p_mapped_by_tlbcam(x) (0UL) | |
73 | #endif /* HAVE_TLBCAM */ | |
74 | ||
75 | #ifdef CONFIG_PTE_64BIT | |
4ee7084e | 76 | /* Some processors use an 8kB pgdir because they have 8-byte Linux PTEs. */ |
14cf11af PM |
77 | #define PGDIR_ORDER 1 |
78 | #else | |
79 | #define PGDIR_ORDER 0 | |
80 | #endif | |
81 | ||
82 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
83 | { | |
84 | pgd_t *ret; | |
85 | ||
86 | ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER); | |
87 | return ret; | |
88 | } | |
89 | ||
5e541973 | 90 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) |
14cf11af PM |
91 | { |
92 | free_pages((unsigned long)pgd, PGDIR_ORDER); | |
93 | } | |
94 | ||
f1aed924 | 95 | __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
96 | { |
97 | pte_t *pte; | |
98 | extern int mem_init_done; | |
99 | extern void *early_get_page(void); | |
100 | ||
101 | if (mem_init_done) { | |
102 | pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); | |
103 | } else { | |
104 | pte = (pte_t *)early_get_page(); | |
105 | if (pte) | |
106 | clear_page(pte); | |
107 | } | |
108 | return pte; | |
109 | } | |
110 | ||
2f569afd | 111 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
14cf11af PM |
112 | { |
113 | struct page *ptepage; | |
114 | ||
115 | #ifdef CONFIG_HIGHPTE | |
2f569afd | 116 | gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT | __GFP_ZERO; |
14cf11af | 117 | #else |
2f569afd | 118 | gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO; |
14cf11af PM |
119 | #endif |
120 | ||
121 | ptepage = alloc_pages(flags, 0); | |
2f569afd MS |
122 | if (!ptepage) |
123 | return NULL; | |
124 | pgtable_page_ctor(ptepage); | |
14cf11af PM |
125 | return ptepage; |
126 | } | |
127 | ||
5e541973 | 128 | void pte_free_kernel(struct mm_struct *mm, pte_t *pte) |
14cf11af PM |
129 | { |
130 | #ifdef CONFIG_SMP | |
131 | hash_page_sync(); | |
132 | #endif | |
133 | free_page((unsigned long)pte); | |
134 | } | |
135 | ||
2f569afd | 136 | void pte_free(struct mm_struct *mm, pgtable_t ptepage) |
14cf11af PM |
137 | { |
138 | #ifdef CONFIG_SMP | |
139 | hash_page_sync(); | |
140 | #endif | |
2f569afd | 141 | pgtable_page_dtor(ptepage); |
14cf11af PM |
142 | __free_page(ptepage); |
143 | } | |
144 | ||
14cf11af PM |
145 | void __iomem * |
146 | ioremap(phys_addr_t addr, unsigned long size) | |
147 | { | |
a1f242ff | 148 | return __ioremap(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED); |
14cf11af | 149 | } |
920573bd | 150 | EXPORT_SYMBOL(ioremap); |
14cf11af | 151 | |
68a64357 BH |
152 | void __iomem * |
153 | ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags) | |
154 | { | |
a1f242ff BH |
155 | /* writeable implies dirty for kernel addresses */ |
156 | if (flags & _PAGE_RW) | |
157 | flags |= _PAGE_DIRTY | _PAGE_HWWRITE; | |
158 | ||
159 | /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ | |
160 | flags &= ~(_PAGE_USER | _PAGE_EXEC | _PAGE_HWEXEC); | |
161 | ||
68a64357 BH |
162 | return __ioremap(addr, size, flags); |
163 | } | |
164 | EXPORT_SYMBOL(ioremap_flags); | |
165 | ||
14cf11af PM |
166 | void __iomem * |
167 | __ioremap(phys_addr_t addr, unsigned long size, unsigned long flags) | |
168 | { | |
169 | unsigned long v, i; | |
170 | phys_addr_t p; | |
171 | int err; | |
172 | ||
a1f242ff BH |
173 | /* Make sure we have the base flags */ |
174 | if ((flags & _PAGE_PRESENT) == 0) | |
175 | flags |= _PAGE_KERNEL; | |
176 | ||
177 | /* Non-cacheable page cannot be coherent */ | |
178 | if (flags & _PAGE_NO_CACHE) | |
179 | flags &= ~_PAGE_COHERENT; | |
180 | ||
14cf11af PM |
181 | /* |
182 | * Choose an address to map it to. | |
183 | * Once the vmalloc system is running, we use it. | |
184 | * Before then, we use space going down from ioremap_base | |
185 | * (ioremap_bot records where we're up to). | |
186 | */ | |
187 | p = addr & PAGE_MASK; | |
188 | size = PAGE_ALIGN(addr + size) - p; | |
189 | ||
190 | /* | |
191 | * If the address lies within the first 16 MB, assume it's in ISA | |
192 | * memory space | |
193 | */ | |
194 | if (p < 16*1024*1024) | |
195 | p += _ISA_MEM_BASE; | |
196 | ||
197 | /* | |
198 | * Don't allow anybody to remap normal RAM that we're using. | |
199 | * mem_init() sets high_memory so only do the check after that. | |
200 | */ | |
7c8c6b97 | 201 | if (mem_init_done && (p < virt_to_phys(high_memory))) { |
37f01d64 DG |
202 | printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n", |
203 | (unsigned long long)p, __builtin_return_address(0)); | |
14cf11af PM |
204 | return NULL; |
205 | } | |
206 | ||
207 | if (size == 0) | |
208 | return NULL; | |
209 | ||
210 | /* | |
211 | * Is it already mapped? Perhaps overlapped by a previous | |
212 | * BAT mapping. If the whole area is mapped then we're done, | |
213 | * otherwise remap it since we want to keep the virt addrs for | |
214 | * each request contiguous. | |
215 | * | |
216 | * We make the assumption here that if the bottom and top | |
217 | * of the range we want are mapped then it's mapped to the | |
218 | * same virt address (and this is contiguous). | |
219 | * -- Cort | |
220 | */ | |
221 | if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ ) | |
222 | goto out; | |
223 | ||
224 | if ((v = p_mapped_by_tlbcam(p))) | |
225 | goto out; | |
226 | ||
227 | if (mem_init_done) { | |
228 | struct vm_struct *area; | |
229 | area = get_vm_area(size, VM_IOREMAP); | |
230 | if (area == 0) | |
231 | return NULL; | |
232 | v = (unsigned long) area->addr; | |
233 | } else { | |
234 | v = (ioremap_bot -= size); | |
235 | } | |
236 | ||
14cf11af PM |
237 | /* |
238 | * Should check if it is a candidate for a BAT mapping | |
239 | */ | |
240 | ||
241 | err = 0; | |
242 | for (i = 0; i < size && err == 0; i += PAGE_SIZE) | |
243 | err = map_page(v+i, p+i, flags); | |
244 | if (err) { | |
245 | if (mem_init_done) | |
246 | vunmap((void *)v); | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | out: | |
251 | return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK)); | |
252 | } | |
920573bd | 253 | EXPORT_SYMBOL(__ioremap); |
14cf11af PM |
254 | |
255 | void iounmap(volatile void __iomem *addr) | |
256 | { | |
257 | /* | |
258 | * If mapped by BATs then there is nothing to do. | |
259 | * Calling vfree() generates a benign warning. | |
260 | */ | |
261 | if (v_mapped_by_bats((unsigned long)addr)) return; | |
262 | ||
263 | if (addr > high_memory && (unsigned long) addr < ioremap_bot) | |
264 | vunmap((void *) (PAGE_MASK & (unsigned long)addr)); | |
265 | } | |
920573bd | 266 | EXPORT_SYMBOL(iounmap); |
14cf11af | 267 | |
68a64357 | 268 | int map_page(unsigned long va, phys_addr_t pa, int flags) |
14cf11af PM |
269 | { |
270 | pmd_t *pd; | |
271 | pte_t *pg; | |
272 | int err = -ENOMEM; | |
273 | ||
14cf11af | 274 | /* Use upper 10 bits of VA to index the first level map */ |
d1953c88 | 275 | pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); |
14cf11af | 276 | /* Use middle 10 bits of VA to index the second-level map */ |
e2f2e58e | 277 | pg = pte_alloc_kernel(pd, va); |
14cf11af PM |
278 | if (pg != 0) { |
279 | err = 0; | |
3be4e699 BH |
280 | /* The PTE should never be already set nor present in the |
281 | * hash table | |
282 | */ | |
283 | BUG_ON(pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)); | |
284 | set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, | |
285 | __pgprot(flags))); | |
14cf11af | 286 | } |
14cf11af PM |
287 | return err; |
288 | } | |
289 | ||
290 | /* | |
4ee7084e | 291 | * Map in a big chunk of physical memory starting at KERNELBASE. |
14cf11af PM |
292 | */ |
293 | void __init mapin_ram(void) | |
294 | { | |
99c62dd7 KG |
295 | unsigned long v, s, f; |
296 | phys_addr_t p; | |
ee4f2ea4 | 297 | int ktext; |
14cf11af PM |
298 | |
299 | s = mmu_mapin_ram(); | |
300 | v = KERNELBASE + s; | |
99c62dd7 | 301 | p = memstart_addr + s; |
14cf11af | 302 | for (; s < total_lowmem; s += PAGE_SIZE) { |
ee4f2ea4 BH |
303 | ktext = ((char *) v >= _stext && (char *) v < etext); |
304 | f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM; | |
14cf11af | 305 | map_page(v, p, f); |
ee4f2ea4 BH |
306 | #ifdef CONFIG_PPC_STD_MMU_32 |
307 | if (ktext) | |
308 | hash_preload(&init_mm, v, 0, 0x300); | |
309 | #endif | |
14cf11af PM |
310 | v += PAGE_SIZE; |
311 | p += PAGE_SIZE; | |
312 | } | |
313 | } | |
314 | ||
14cf11af PM |
315 | /* Scan the real Linux page tables and return a PTE pointer for |
316 | * a virtual address in a context. | |
317 | * Returns true (1) if PTE was found, zero otherwise. The pointer to | |
318 | * the PTE pointer is unmodified if PTE is not found. | |
319 | */ | |
320 | int | |
bab70a4a | 321 | get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) |
14cf11af PM |
322 | { |
323 | pgd_t *pgd; | |
d1953c88 | 324 | pud_t *pud; |
14cf11af PM |
325 | pmd_t *pmd; |
326 | pte_t *pte; | |
327 | int retval = 0; | |
328 | ||
329 | pgd = pgd_offset(mm, addr & PAGE_MASK); | |
330 | if (pgd) { | |
d1953c88 DG |
331 | pud = pud_offset(pgd, addr & PAGE_MASK); |
332 | if (pud && pud_present(*pud)) { | |
333 | pmd = pmd_offset(pud, addr & PAGE_MASK); | |
334 | if (pmd_present(*pmd)) { | |
335 | pte = pte_offset_map(pmd, addr & PAGE_MASK); | |
336 | if (pte) { | |
337 | retval = 1; | |
338 | *ptep = pte; | |
339 | if (pmdp) | |
340 | *pmdp = pmd; | |
341 | /* XXX caller needs to do pte_unmap, yuck */ | |
342 | } | |
343 | } | |
344 | } | |
14cf11af PM |
345 | } |
346 | return(retval); | |
347 | } | |
348 | ||
88df6e90 BH |
349 | #ifdef CONFIG_DEBUG_PAGEALLOC |
350 | ||
351 | static int __change_page_attr(struct page *page, pgprot_t prot) | |
352 | { | |
353 | pte_t *kpte; | |
354 | pmd_t *kpmd; | |
355 | unsigned long address; | |
356 | ||
357 | BUG_ON(PageHighMem(page)); | |
358 | address = (unsigned long)page_address(page); | |
359 | ||
360 | if (v_mapped_by_bats(address) || v_mapped_by_tlbcam(address)) | |
361 | return 0; | |
362 | if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) | |
363 | return -EINVAL; | |
364 | set_pte_at(&init_mm, address, kpte, mk_pte(page, prot)); | |
365 | wmb(); | |
366 | flush_HPTE(0, address, pmd_val(*kpmd)); | |
367 | pte_unmap(kpte); | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Change the page attributes of an page in the linear mapping. | |
374 | * | |
375 | * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY | |
376 | */ | |
377 | static int change_page_attr(struct page *page, int numpages, pgprot_t prot) | |
378 | { | |
379 | int i, err = 0; | |
380 | unsigned long flags; | |
381 | ||
382 | local_irq_save(flags); | |
383 | for (i = 0; i < numpages; i++, page++) { | |
384 | err = __change_page_attr(page, prot); | |
385 | if (err) | |
386 | break; | |
387 | } | |
388 | local_irq_restore(flags); | |
389 | return err; | |
390 | } | |
391 | ||
392 | ||
393 | void kernel_map_pages(struct page *page, int numpages, int enable) | |
394 | { | |
395 | if (PageHighMem(page)) | |
396 | return; | |
397 | ||
398 | change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); | |
399 | } | |
400 | #endif /* CONFIG_DEBUG_PAGEALLOC */ | |
2c419bde KG |
401 | |
402 | static int fixmaps; | |
403 | unsigned long FIXADDR_TOP = 0xfffff000; | |
404 | EXPORT_SYMBOL(FIXADDR_TOP); | |
405 | ||
406 | void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) | |
407 | { | |
408 | unsigned long address = __fix_to_virt(idx); | |
409 | ||
410 | if (idx >= __end_of_fixed_addresses) { | |
411 | BUG(); | |
412 | return; | |
413 | } | |
414 | ||
46a74179 | 415 | map_page(address, phys, pgprot_val(flags)); |
2c419bde KG |
416 | fixmaps++; |
417 | } | |
418 | ||
419 | void __this_fixmap_does_not_exist(void) | |
420 | { | |
421 | WARN_ON(1); | |
422 | } |