]>
Commit | Line | Data |
---|---|---|
d111e8f9 RK |
1 | /* |
2 | * linux/arch/arm/mm/mmu.c | |
3 | * | |
4 | * Copyright (C) 1995-2005 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
ae8f1541 | 10 | #include <linux/module.h> |
d111e8f9 RK |
11 | #include <linux/kernel.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/bootmem.h> | |
15 | #include <linux/mman.h> | |
16 | #include <linux/nodemask.h> | |
17 | ||
18 | #include <asm/mach-types.h> | |
19 | #include <asm/setup.h> | |
20 | #include <asm/sizes.h> | |
21 | #include <asm/tlb.h> | |
22 | ||
23 | #include <asm/mach/arch.h> | |
24 | #include <asm/mach/map.h> | |
25 | ||
26 | #include "mm.h" | |
27 | ||
28 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
29 | ||
6ae5a6ef | 30 | extern void _stext, _etext, __data_start, _end; |
d111e8f9 RK |
31 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
32 | ||
33 | /* | |
34 | * empty_zero_page is a special page that is used for | |
35 | * zero-initialized data and COW. | |
36 | */ | |
37 | struct page *empty_zero_page; | |
38 | ||
39 | /* | |
40 | * The pmd table for the upper-most set of pages. | |
41 | */ | |
42 | pmd_t *top_pmd; | |
43 | ||
ae8f1541 RK |
44 | #define CPOLICY_UNCACHED 0 |
45 | #define CPOLICY_BUFFERED 1 | |
46 | #define CPOLICY_WRITETHROUGH 2 | |
47 | #define CPOLICY_WRITEBACK 3 | |
48 | #define CPOLICY_WRITEALLOC 4 | |
49 | ||
50 | static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK; | |
51 | static unsigned int ecc_mask __initdata = 0; | |
44b18693 | 52 | pgprot_t pgprot_user; |
ae8f1541 RK |
53 | pgprot_t pgprot_kernel; |
54 | ||
44b18693 | 55 | EXPORT_SYMBOL(pgprot_user); |
ae8f1541 RK |
56 | EXPORT_SYMBOL(pgprot_kernel); |
57 | ||
58 | struct cachepolicy { | |
59 | const char policy[16]; | |
60 | unsigned int cr_mask; | |
61 | unsigned int pmd; | |
62 | unsigned int pte; | |
63 | }; | |
64 | ||
65 | static struct cachepolicy cache_policies[] __initdata = { | |
66 | { | |
67 | .policy = "uncached", | |
68 | .cr_mask = CR_W|CR_C, | |
69 | .pmd = PMD_SECT_UNCACHED, | |
70 | .pte = 0, | |
71 | }, { | |
72 | .policy = "buffered", | |
73 | .cr_mask = CR_C, | |
74 | .pmd = PMD_SECT_BUFFERED, | |
75 | .pte = PTE_BUFFERABLE, | |
76 | }, { | |
77 | .policy = "writethrough", | |
78 | .cr_mask = 0, | |
79 | .pmd = PMD_SECT_WT, | |
80 | .pte = PTE_CACHEABLE, | |
81 | }, { | |
82 | .policy = "writeback", | |
83 | .cr_mask = 0, | |
84 | .pmd = PMD_SECT_WB, | |
85 | .pte = PTE_BUFFERABLE|PTE_CACHEABLE, | |
86 | }, { | |
87 | .policy = "writealloc", | |
88 | .cr_mask = 0, | |
89 | .pmd = PMD_SECT_WBWA, | |
90 | .pte = PTE_BUFFERABLE|PTE_CACHEABLE, | |
91 | } | |
92 | }; | |
93 | ||
94 | /* | |
95 | * These are useful for identifing cache coherency | |
96 | * problems by allowing the cache or the cache and | |
97 | * writebuffer to be turned off. (Note: the write | |
98 | * buffer should not be on and the cache off). | |
99 | */ | |
100 | static void __init early_cachepolicy(char **p) | |
101 | { | |
102 | int i; | |
103 | ||
104 | for (i = 0; i < ARRAY_SIZE(cache_policies); i++) { | |
105 | int len = strlen(cache_policies[i].policy); | |
106 | ||
107 | if (memcmp(*p, cache_policies[i].policy, len) == 0) { | |
108 | cachepolicy = i; | |
109 | cr_alignment &= ~cache_policies[i].cr_mask; | |
110 | cr_no_alignment &= ~cache_policies[i].cr_mask; | |
111 | *p += len; | |
112 | break; | |
113 | } | |
114 | } | |
115 | if (i == ARRAY_SIZE(cache_policies)) | |
116 | printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n"); | |
117 | flush_cache_all(); | |
118 | set_cr(cr_alignment); | |
119 | } | |
120 | __early_param("cachepolicy=", early_cachepolicy); | |
121 | ||
122 | static void __init early_nocache(char **__unused) | |
123 | { | |
124 | char *p = "buffered"; | |
125 | printk(KERN_WARNING "nocache is deprecated; use cachepolicy=%s\n", p); | |
126 | early_cachepolicy(&p); | |
127 | } | |
128 | __early_param("nocache", early_nocache); | |
129 | ||
130 | static void __init early_nowrite(char **__unused) | |
131 | { | |
132 | char *p = "uncached"; | |
133 | printk(KERN_WARNING "nowb is deprecated; use cachepolicy=%s\n", p); | |
134 | early_cachepolicy(&p); | |
135 | } | |
136 | __early_param("nowb", early_nowrite); | |
137 | ||
138 | static void __init early_ecc(char **p) | |
139 | { | |
140 | if (memcmp(*p, "on", 2) == 0) { | |
141 | ecc_mask = PMD_PROTECTION; | |
142 | *p += 2; | |
143 | } else if (memcmp(*p, "off", 3) == 0) { | |
144 | ecc_mask = 0; | |
145 | *p += 3; | |
146 | } | |
147 | } | |
148 | __early_param("ecc=", early_ecc); | |
149 | ||
150 | static int __init noalign_setup(char *__unused) | |
151 | { | |
152 | cr_alignment &= ~CR_A; | |
153 | cr_no_alignment &= ~CR_A; | |
154 | set_cr(cr_alignment); | |
155 | return 1; | |
156 | } | |
157 | __setup("noalign", noalign_setup); | |
158 | ||
255d1f86 RK |
159 | #ifndef CONFIG_SMP |
160 | void adjust_cr(unsigned long mask, unsigned long set) | |
161 | { | |
162 | unsigned long flags; | |
163 | ||
164 | mask &= ~CR_A; | |
165 | ||
166 | set &= mask; | |
167 | ||
168 | local_irq_save(flags); | |
169 | ||
170 | cr_no_alignment = (cr_no_alignment & ~mask) | set; | |
171 | cr_alignment = (cr_alignment & ~mask) | set; | |
172 | ||
173 | set_cr((get_cr() & ~mask) | set); | |
174 | ||
175 | local_irq_restore(flags); | |
176 | } | |
177 | #endif | |
178 | ||
2497f0a8 | 179 | struct mem_type { |
ae8f1541 RK |
180 | unsigned int prot_pte; |
181 | unsigned int prot_l1; | |
182 | unsigned int prot_sect; | |
183 | unsigned int domain; | |
184 | }; | |
185 | ||
2497f0a8 | 186 | static struct mem_type mem_types[] __initdata = { |
ae8f1541 RK |
187 | [MT_DEVICE] = { |
188 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
189 | L_PTE_WRITE, | |
190 | .prot_l1 = PMD_TYPE_TABLE, | |
191 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED | | |
192 | PMD_SECT_AP_WRITE, | |
193 | .domain = DOMAIN_IO, | |
194 | }, | |
195 | [MT_CACHECLEAN] = { | |
196 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4, | |
197 | .domain = DOMAIN_KERNEL, | |
198 | }, | |
199 | [MT_MINICLEAN] = { | |
200 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_MINICACHE, | |
201 | .domain = DOMAIN_KERNEL, | |
202 | }, | |
203 | [MT_LOW_VECTORS] = { | |
204 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
205 | L_PTE_EXEC, | |
206 | .prot_l1 = PMD_TYPE_TABLE, | |
207 | .domain = DOMAIN_USER, | |
208 | }, | |
209 | [MT_HIGH_VECTORS] = { | |
210 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
211 | L_PTE_USER | L_PTE_EXEC, | |
212 | .prot_l1 = PMD_TYPE_TABLE, | |
213 | .domain = DOMAIN_USER, | |
214 | }, | |
215 | [MT_MEMORY] = { | |
216 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_AP_WRITE, | |
217 | .domain = DOMAIN_KERNEL, | |
218 | }, | |
219 | [MT_ROM] = { | |
220 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4, | |
221 | .domain = DOMAIN_KERNEL, | |
222 | }, | |
223 | [MT_IXP2000_DEVICE] = { /* IXP2400 requires XCB=101 for on-chip I/O */ | |
224 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
225 | L_PTE_WRITE, | |
226 | .prot_l1 = PMD_TYPE_TABLE, | |
227 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_UNCACHED | | |
228 | PMD_SECT_AP_WRITE | PMD_SECT_BUFFERABLE | | |
229 | PMD_SECT_TEX(1), | |
230 | .domain = DOMAIN_IO, | |
231 | }, | |
232 | [MT_NONSHARED_DEVICE] = { | |
233 | .prot_l1 = PMD_TYPE_TABLE, | |
234 | .prot_sect = PMD_TYPE_SECT | PMD_BIT4 | PMD_SECT_NONSHARED_DEV | | |
235 | PMD_SECT_AP_WRITE, | |
236 | .domain = DOMAIN_IO, | |
237 | } | |
238 | }; | |
239 | ||
240 | /* | |
241 | * Adjust the PMD section entries according to the CPU in use. | |
242 | */ | |
243 | static void __init build_mem_type_table(void) | |
244 | { | |
245 | struct cachepolicy *cp; | |
246 | unsigned int cr = get_cr(); | |
247 | unsigned int user_pgprot, kern_pgprot; | |
248 | int cpu_arch = cpu_architecture(); | |
249 | int i; | |
250 | ||
251 | #if defined(CONFIG_CPU_DCACHE_DISABLE) | |
252 | if (cachepolicy > CPOLICY_BUFFERED) | |
253 | cachepolicy = CPOLICY_BUFFERED; | |
254 | #elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH) | |
255 | if (cachepolicy > CPOLICY_WRITETHROUGH) | |
256 | cachepolicy = CPOLICY_WRITETHROUGH; | |
257 | #endif | |
258 | if (cpu_arch < CPU_ARCH_ARMv5) { | |
259 | if (cachepolicy >= CPOLICY_WRITEALLOC) | |
260 | cachepolicy = CPOLICY_WRITEBACK; | |
261 | ecc_mask = 0; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Xscale must not have PMD bit 4 set for section mappings. | |
266 | */ | |
267 | if (cpu_is_xscale()) | |
268 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) | |
269 | mem_types[i].prot_sect &= ~PMD_BIT4; | |
270 | ||
271 | /* | |
272 | * ARMv5 and lower, excluding Xscale, bit 4 must be set for | |
273 | * page tables. | |
274 | */ | |
275 | if (cpu_arch < CPU_ARCH_ARMv6 && !cpu_is_xscale()) | |
276 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) | |
277 | if (mem_types[i].prot_l1) | |
278 | mem_types[i].prot_l1 |= PMD_BIT4; | |
279 | ||
280 | cp = &cache_policies[cachepolicy]; | |
281 | kern_pgprot = user_pgprot = cp->pte; | |
282 | ||
283 | /* | |
284 | * Enable CPU-specific coherency if supported. | |
285 | * (Only available on XSC3 at the moment.) | |
286 | */ | |
287 | if (arch_is_coherent()) { | |
288 | if (cpu_is_xsc3()) { | |
289 | mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S; | |
0e5fdca7 | 290 | mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED; |
ae8f1541 RK |
291 | } |
292 | } | |
293 | ||
294 | /* | |
295 | * ARMv6 and above have extended page tables. | |
296 | */ | |
297 | if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) { | |
298 | /* | |
299 | * bit 4 becomes XN which we must clear for the | |
300 | * kernel memory mapping. | |
301 | */ | |
302 | mem_types[MT_MEMORY].prot_sect &= ~PMD_SECT_XN; | |
303 | mem_types[MT_ROM].prot_sect &= ~PMD_SECT_XN; | |
304 | ||
305 | /* | |
306 | * Mark cache clean areas and XIP ROM read only | |
307 | * from SVC mode and no access from userspace. | |
308 | */ | |
309 | mem_types[MT_ROM].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
310 | mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
311 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
312 | ||
313 | /* | |
314 | * Mark the device area as "shared device" | |
315 | */ | |
316 | mem_types[MT_DEVICE].prot_pte |= L_PTE_BUFFERABLE; | |
317 | mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED; | |
318 | ||
ae8f1541 RK |
319 | #ifdef CONFIG_SMP |
320 | /* | |
321 | * Mark memory with the "shared" attribute for SMP systems | |
322 | */ | |
323 | user_pgprot |= L_PTE_SHARED; | |
324 | kern_pgprot |= L_PTE_SHARED; | |
325 | mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S; | |
326 | #endif | |
327 | } | |
328 | ||
329 | for (i = 0; i < 16; i++) { | |
330 | unsigned long v = pgprot_val(protection_map[i]); | |
331 | v = (v & ~(L_PTE_BUFFERABLE|L_PTE_CACHEABLE)) | user_pgprot; | |
332 | protection_map[i] = __pgprot(v); | |
333 | } | |
334 | ||
335 | mem_types[MT_LOW_VECTORS].prot_pte |= kern_pgprot; | |
336 | mem_types[MT_HIGH_VECTORS].prot_pte |= kern_pgprot; | |
337 | ||
338 | if (cpu_arch >= CPU_ARCH_ARMv5) { | |
339 | #ifndef CONFIG_SMP | |
340 | /* | |
341 | * Only use write-through for non-SMP systems | |
342 | */ | |
343 | mem_types[MT_LOW_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE; | |
344 | mem_types[MT_HIGH_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE; | |
345 | #endif | |
346 | } else { | |
347 | mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1); | |
348 | } | |
349 | ||
44b18693 | 350 | pgprot_user = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot); |
ae8f1541 RK |
351 | pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | |
352 | L_PTE_DIRTY | L_PTE_WRITE | | |
353 | L_PTE_EXEC | kern_pgprot); | |
354 | ||
355 | mem_types[MT_LOW_VECTORS].prot_l1 |= ecc_mask; | |
356 | mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask; | |
357 | mem_types[MT_MEMORY].prot_sect |= ecc_mask | cp->pmd; | |
358 | mem_types[MT_ROM].prot_sect |= cp->pmd; | |
359 | ||
360 | switch (cp->pmd) { | |
361 | case PMD_SECT_WT: | |
362 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WT; | |
363 | break; | |
364 | case PMD_SECT_WB: | |
365 | case PMD_SECT_WBWA: | |
366 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WB; | |
367 | break; | |
368 | } | |
369 | printk("Memory policy: ECC %sabled, Data cache %s\n", | |
370 | ecc_mask ? "en" : "dis", cp->policy); | |
2497f0a8 RK |
371 | |
372 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) { | |
373 | struct mem_type *t = &mem_types[i]; | |
374 | if (t->prot_l1) | |
375 | t->prot_l1 |= PMD_DOMAIN(t->domain); | |
376 | if (t->prot_sect) | |
377 | t->prot_sect |= PMD_DOMAIN(t->domain); | |
378 | } | |
ae8f1541 RK |
379 | } |
380 | ||
381 | #define vectors_base() (vectors_high() ? 0xffff0000 : 0) | |
382 | ||
383 | /* | |
384 | * Create a SECTION PGD between VIRT and PHYS in domain | |
385 | * DOMAIN with protection PROT. This operates on half- | |
386 | * pgdir entry increments. | |
387 | */ | |
388 | static inline void | |
389 | alloc_init_section(unsigned long virt, unsigned long phys, int prot) | |
390 | { | |
391 | pmd_t *pmdp = pmd_off_k(virt); | |
392 | ||
393 | if (virt & (1 << 20)) | |
394 | pmdp++; | |
395 | ||
396 | *pmdp = __pmd(phys | prot); | |
397 | flush_pmd_entry(pmdp); | |
398 | } | |
399 | ||
400 | /* | |
401 | * Create a SUPER SECTION PGD between VIRT and PHYS with protection PROT | |
402 | */ | |
403 | static inline void | |
404 | alloc_init_supersection(unsigned long virt, unsigned long phys, int prot) | |
405 | { | |
406 | int i; | |
407 | ||
408 | for (i = 0; i < 16; i += 1) { | |
409 | alloc_init_section(virt, phys, prot | PMD_SECT_SUPER); | |
410 | ||
411 | virt += (PGDIR_SIZE / 2); | |
412 | } | |
413 | } | |
414 | ||
415 | /* | |
416 | * Add a PAGE mapping between VIRT and PHYS in domain | |
417 | * DOMAIN with protection PROT. Note that due to the | |
418 | * way we map the PTEs, we must allocate two PTE_SIZE'd | |
419 | * blocks - one for the Linux pte table, and one for | |
420 | * the hardware pte table. | |
421 | */ | |
422 | static inline void | |
d5c98176 | 423 | alloc_init_page(unsigned long virt, unsigned long phys, const struct mem_type *type) |
ae8f1541 RK |
424 | { |
425 | pmd_t *pmdp = pmd_off_k(virt); | |
426 | pte_t *ptep; | |
427 | ||
428 | if (pmd_none(*pmdp)) { | |
429 | ptep = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * | |
430 | sizeof(pte_t)); | |
431 | ||
d5c98176 | 432 | __pmd_populate(pmdp, __pa(ptep) | type->prot_l1); |
ae8f1541 RK |
433 | } |
434 | ptep = pte_offset_kernel(pmdp, virt); | |
435 | ||
d5c98176 | 436 | set_pte_ext(ptep, pfn_pte(phys >> PAGE_SHIFT, __pgprot(type->prot_pte)), 0); |
ae8f1541 RK |
437 | } |
438 | ||
439 | /* | |
440 | * Create the page directory entries and any necessary | |
441 | * page tables for the mapping specified by `md'. We | |
442 | * are able to cope here with varying sizes and address | |
443 | * offsets, and we take full advantage of sections and | |
444 | * supersections. | |
445 | */ | |
446 | void __init create_mapping(struct map_desc *md) | |
447 | { | |
448 | unsigned long virt, length; | |
ae8f1541 | 449 | unsigned long off = (u32)__pfn_to_phys(md->pfn); |
d5c98176 | 450 | const struct mem_type *type; |
ae8f1541 RK |
451 | |
452 | if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) { | |
453 | printk(KERN_WARNING "BUG: not creating mapping for " | |
454 | "0x%08llx at 0x%08lx in user region\n", | |
455 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
456 | return; | |
457 | } | |
458 | ||
459 | if ((md->type == MT_DEVICE || md->type == MT_ROM) && | |
460 | md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) { | |
461 | printk(KERN_WARNING "BUG: mapping for 0x%08llx at 0x%08lx " | |
462 | "overlaps vmalloc space\n", | |
463 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
464 | } | |
465 | ||
d5c98176 | 466 | type = &mem_types[md->type]; |
ae8f1541 RK |
467 | |
468 | /* | |
469 | * Catch 36-bit addresses | |
470 | */ | |
471 | if(md->pfn >= 0x100000) { | |
d5c98176 | 472 | if (type->domain) { |
ae8f1541 RK |
473 | printk(KERN_ERR "MM: invalid domain in supersection " |
474 | "mapping for 0x%08llx at 0x%08lx\n", | |
475 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
476 | return; | |
477 | } | |
478 | if((md->virtual | md->length | __pfn_to_phys(md->pfn)) | |
479 | & ~SUPERSECTION_MASK) { | |
480 | printk(KERN_ERR "MM: cannot create mapping for " | |
481 | "0x%08llx at 0x%08lx invalid alignment\n", | |
482 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
483 | return; | |
484 | } | |
485 | ||
486 | /* | |
487 | * Shift bits [35:32] of address into bits [23:20] of PMD | |
488 | * (See ARMv6 spec). | |
489 | */ | |
490 | off |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20); | |
491 | } | |
492 | ||
493 | virt = md->virtual; | |
494 | off -= virt; | |
495 | length = md->length; | |
496 | ||
d5c98176 | 497 | if (type->prot_l1 == 0 && |
ae8f1541 RK |
498 | (virt & 0xfffff || (virt + off) & 0xfffff || (virt + length) & 0xfffff)) { |
499 | printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not " | |
500 | "be mapped using pages, ignoring.\n", | |
501 | __pfn_to_phys(md->pfn), md->virtual); | |
502 | return; | |
503 | } | |
504 | ||
505 | while ((virt & 0xfffff || (virt + off) & 0xfffff) && length >= PAGE_SIZE) { | |
d5c98176 | 506 | alloc_init_page(virt, virt + off, type); |
ae8f1541 RK |
507 | |
508 | virt += PAGE_SIZE; | |
509 | length -= PAGE_SIZE; | |
510 | } | |
511 | ||
512 | /* N.B. ARMv6 supersections are only defined to work with domain 0. | |
513 | * Since domain assignments can in fact be arbitrary, the | |
514 | * 'domain == 0' check below is required to insure that ARMv6 | |
515 | * supersections are only allocated for domain 0 regardless | |
516 | * of the actual domain assignments in use. | |
517 | */ | |
518 | if ((cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3()) | |
d5c98176 | 519 | && type->domain == 0) { |
ae8f1541 RK |
520 | /* |
521 | * Align to supersection boundary if !high pages. | |
522 | * High pages have already been checked for proper | |
523 | * alignment above and they will fail the SUPSERSECTION_MASK | |
524 | * check because of the way the address is encoded into | |
525 | * offset. | |
526 | */ | |
527 | if (md->pfn <= 0x100000) { | |
528 | while ((virt & ~SUPERSECTION_MASK || | |
529 | (virt + off) & ~SUPERSECTION_MASK) && | |
530 | length >= (PGDIR_SIZE / 2)) { | |
d5c98176 | 531 | alloc_init_section(virt, virt + off, type->prot_sect); |
ae8f1541 RK |
532 | |
533 | virt += (PGDIR_SIZE / 2); | |
534 | length -= (PGDIR_SIZE / 2); | |
535 | } | |
536 | } | |
537 | ||
538 | while (length >= SUPERSECTION_SIZE) { | |
d5c98176 | 539 | alloc_init_supersection(virt, virt + off, type->prot_sect); |
ae8f1541 RK |
540 | |
541 | virt += SUPERSECTION_SIZE; | |
542 | length -= SUPERSECTION_SIZE; | |
543 | } | |
544 | } | |
545 | ||
546 | /* | |
547 | * A section mapping covers half a "pgdir" entry. | |
548 | */ | |
549 | while (length >= (PGDIR_SIZE / 2)) { | |
d5c98176 | 550 | alloc_init_section(virt, virt + off, type->prot_sect); |
ae8f1541 RK |
551 | |
552 | virt += (PGDIR_SIZE / 2); | |
553 | length -= (PGDIR_SIZE / 2); | |
554 | } | |
555 | ||
556 | while (length >= PAGE_SIZE) { | |
d5c98176 | 557 | alloc_init_page(virt, virt + off, type); |
ae8f1541 RK |
558 | |
559 | virt += PAGE_SIZE; | |
560 | length -= PAGE_SIZE; | |
561 | } | |
562 | } | |
563 | ||
564 | /* | |
565 | * Create the architecture specific mappings | |
566 | */ | |
567 | void __init iotable_init(struct map_desc *io_desc, int nr) | |
568 | { | |
569 | int i; | |
570 | ||
571 | for (i = 0; i < nr; i++) | |
572 | create_mapping(io_desc + i); | |
573 | } | |
574 | ||
d111e8f9 RK |
575 | static inline void prepare_page_table(struct meminfo *mi) |
576 | { | |
577 | unsigned long addr; | |
578 | ||
579 | /* | |
580 | * Clear out all the mappings below the kernel image. | |
581 | */ | |
582 | for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE) | |
583 | pmd_clear(pmd_off_k(addr)); | |
584 | ||
585 | #ifdef CONFIG_XIP_KERNEL | |
586 | /* The XIP kernel is mapped in the module area -- skip over it */ | |
587 | addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK; | |
588 | #endif | |
589 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) | |
590 | pmd_clear(pmd_off_k(addr)); | |
591 | ||
592 | /* | |
593 | * Clear out all the kernel space mappings, except for the first | |
594 | * memory bank, up to the end of the vmalloc region. | |
595 | */ | |
596 | for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size); | |
597 | addr < VMALLOC_END; addr += PGDIR_SIZE) | |
598 | pmd_clear(pmd_off_k(addr)); | |
599 | } | |
600 | ||
601 | /* | |
602 | * Reserve the various regions of node 0 | |
603 | */ | |
604 | void __init reserve_node_zero(pg_data_t *pgdat) | |
605 | { | |
606 | unsigned long res_size = 0; | |
607 | ||
608 | /* | |
609 | * Register the kernel text and data with bootmem. | |
610 | * Note that this can only be in node 0. | |
611 | */ | |
612 | #ifdef CONFIG_XIP_KERNEL | |
613 | reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start); | |
614 | #else | |
615 | reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext); | |
616 | #endif | |
617 | ||
618 | /* | |
619 | * Reserve the page tables. These are already in use, | |
620 | * and can only be in node 0. | |
621 | */ | |
622 | reserve_bootmem_node(pgdat, __pa(swapper_pg_dir), | |
623 | PTRS_PER_PGD * sizeof(pgd_t)); | |
624 | ||
625 | /* | |
626 | * Hmm... This should go elsewhere, but we really really need to | |
627 | * stop things allocating the low memory; ideally we need a better | |
628 | * implementation of GFP_DMA which does not assume that DMA-able | |
629 | * memory starts at zero. | |
630 | */ | |
631 | if (machine_is_integrator() || machine_is_cintegrator()) | |
632 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
633 | ||
634 | /* | |
635 | * These should likewise go elsewhere. They pre-reserve the | |
636 | * screen memory region at the start of main system memory. | |
637 | */ | |
638 | if (machine_is_edb7211()) | |
639 | res_size = 0x00020000; | |
640 | if (machine_is_p720t()) | |
641 | res_size = 0x00014000; | |
642 | ||
bbf6f280 BD |
643 | /* H1940 and RX3715 need to reserve this for suspend */ |
644 | ||
645 | if (machine_is_h1940() || machine_is_rx3715()) { | |
9073341c BD |
646 | reserve_bootmem_node(pgdat, 0x30003000, 0x1000); |
647 | reserve_bootmem_node(pgdat, 0x30081000, 0x1000); | |
648 | } | |
649 | ||
d111e8f9 RK |
650 | #ifdef CONFIG_SA1111 |
651 | /* | |
652 | * Because of the SA1111 DMA bug, we want to preserve our | |
653 | * precious DMA-able memory... | |
654 | */ | |
655 | res_size = __pa(swapper_pg_dir) - PHYS_OFFSET; | |
656 | #endif | |
657 | if (res_size) | |
658 | reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size); | |
659 | } | |
660 | ||
661 | /* | |
662 | * Set up device the mappings. Since we clear out the page tables for all | |
663 | * mappings above VMALLOC_END, we will remove any debug device mappings. | |
664 | * This means you have to be careful how you debug this function, or any | |
665 | * called function. This means you can't use any function or debugging | |
666 | * method which may touch any device, otherwise the kernel _will_ crash. | |
667 | */ | |
668 | static void __init devicemaps_init(struct machine_desc *mdesc) | |
669 | { | |
670 | struct map_desc map; | |
671 | unsigned long addr; | |
672 | void *vectors; | |
673 | ||
674 | /* | |
675 | * Allocate the vector page early. | |
676 | */ | |
677 | vectors = alloc_bootmem_low_pages(PAGE_SIZE); | |
678 | BUG_ON(!vectors); | |
679 | ||
680 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) | |
681 | pmd_clear(pmd_off_k(addr)); | |
682 | ||
683 | /* | |
684 | * Map the kernel if it is XIP. | |
685 | * It is always first in the modulearea. | |
686 | */ | |
687 | #ifdef CONFIG_XIP_KERNEL | |
688 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK); | |
689 | map.virtual = MODULE_START; | |
690 | map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK; | |
691 | map.type = MT_ROM; | |
692 | create_mapping(&map); | |
693 | #endif | |
694 | ||
695 | /* | |
696 | * Map the cache flushing regions. | |
697 | */ | |
698 | #ifdef FLUSH_BASE | |
699 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); | |
700 | map.virtual = FLUSH_BASE; | |
701 | map.length = SZ_1M; | |
702 | map.type = MT_CACHECLEAN; | |
703 | create_mapping(&map); | |
704 | #endif | |
705 | #ifdef FLUSH_BASE_MINICACHE | |
706 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M); | |
707 | map.virtual = FLUSH_BASE_MINICACHE; | |
708 | map.length = SZ_1M; | |
709 | map.type = MT_MINICLEAN; | |
710 | create_mapping(&map); | |
711 | #endif | |
712 | ||
713 | /* | |
714 | * Create a mapping for the machine vectors at the high-vectors | |
715 | * location (0xffff0000). If we aren't using high-vectors, also | |
716 | * create a mapping at the low-vectors virtual address. | |
717 | */ | |
718 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); | |
719 | map.virtual = 0xffff0000; | |
720 | map.length = PAGE_SIZE; | |
721 | map.type = MT_HIGH_VECTORS; | |
722 | create_mapping(&map); | |
723 | ||
724 | if (!vectors_high()) { | |
725 | map.virtual = 0; | |
726 | map.type = MT_LOW_VECTORS; | |
727 | create_mapping(&map); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Ask the machine support to map in the statically mapped devices. | |
732 | */ | |
733 | if (mdesc->map_io) | |
734 | mdesc->map_io(); | |
735 | ||
736 | /* | |
737 | * Finally flush the caches and tlb to ensure that we're in a | |
738 | * consistent state wrt the writebuffer. This also ensures that | |
739 | * any write-allocated cache lines in the vector page are written | |
740 | * back. After this point, we can start to touch devices again. | |
741 | */ | |
742 | local_flush_tlb_all(); | |
743 | flush_cache_all(); | |
744 | } | |
745 | ||
746 | /* | |
747 | * paging_init() sets up the page tables, initialises the zone memory | |
748 | * maps, and sets up the zero page, bad page and bad page tables. | |
749 | */ | |
750 | void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc) | |
751 | { | |
752 | void *zero_page; | |
753 | ||
754 | build_mem_type_table(); | |
755 | prepare_page_table(mi); | |
756 | bootmem_init(mi); | |
757 | devicemaps_init(mdesc); | |
758 | ||
759 | top_pmd = pmd_off_k(0xffff0000); | |
760 | ||
761 | /* | |
762 | * allocate the zero page. Note that we count on this going ok. | |
763 | */ | |
764 | zero_page = alloc_bootmem_low_pages(PAGE_SIZE); | |
765 | memzero(zero_page, PAGE_SIZE); | |
766 | empty_zero_page = virt_to_page(zero_page); | |
767 | flush_dcache_page(empty_zero_page); | |
768 | } | |
ae8f1541 RK |
769 | |
770 | /* | |
771 | * In order to soft-boot, we need to insert a 1:1 mapping in place of | |
772 | * the user-mode pages. This will then ensure that we have predictable | |
773 | * results when turning the mmu off | |
774 | */ | |
775 | void setup_mm_for_reboot(char mode) | |
776 | { | |
777 | unsigned long base_pmdval; | |
778 | pgd_t *pgd; | |
779 | int i; | |
780 | ||
781 | if (current->mm && current->mm->pgd) | |
782 | pgd = current->mm->pgd; | |
783 | else | |
784 | pgd = init_mm.pgd; | |
785 | ||
786 | base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT; | |
787 | if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale()) | |
788 | base_pmdval |= PMD_BIT4; | |
789 | ||
790 | for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) { | |
791 | unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval; | |
792 | pmd_t *pmd; | |
793 | ||
794 | pmd = pmd_off(pgd, i << PGDIR_SHIFT); | |
795 | pmd[0] = __pmd(pmdval); | |
796 | pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1))); | |
797 | flush_pmd_entry(pmd); | |
798 | } | |
799 | } |