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IB/srp: Let srp_abort() return FAST_IO_FAIL if TL offline
[linux/fpc-iii.git] / arch / arm / mm / mmu.c
blobe0d8565671a6c8104c643937098b963ac2f517ee
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 */
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/init.h>
14 #include <linux/mman.h>
15 #include <linux/nodemask.h>
16 #include <linux/memblock.h>
17 #include <linux/fs.h>
18 #include <linux/vmalloc.h>
19 #include <linux/sizes.h>
20
21 #include <asm/cp15.h>
22 #include <asm/cputype.h>
23 #include <asm/sections.h>
24 #include <asm/cachetype.h>
25 #include <asm/setup.h>
26 #include <asm/smp_plat.h>
27 #include <asm/tlb.h>
28 #include <asm/highmem.h>
29 #include <asm/system_info.h>
30 #include <asm/traps.h>
31
32 #include <asm/mach/arch.h>
33 #include <asm/mach/map.h>
34 #include <asm/mach/pci.h>
35
36 #include "mm.h"
37 #include "tcm.h"
38
39 /*
40 * empty_zero_page is a special page that is used for
41 * zero-initialized data and COW.
42 */
43 struct page *empty_zero_page;
44 EXPORT_SYMBOL(empty_zero_page);
45
46 /*
47 * The pmd table for the upper-most set of pages.
48 */
49 pmd_t *top_pmd;
50
51 #define CPOLICY_UNCACHED 0
52 #define CPOLICY_BUFFERED 1
53 #define CPOLICY_WRITETHROUGH 2
54 #define CPOLICY_WRITEBACK 3
55 #define CPOLICY_WRITEALLOC 4
56
57 static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK;
58 static unsigned int ecc_mask __initdata = 0;
59 pgprot_t pgprot_user;
60 pgprot_t pgprot_kernel;
61 pgprot_t pgprot_hyp_device;
62 pgprot_t pgprot_s2;
63 pgprot_t pgprot_s2_device;
64
65 EXPORT_SYMBOL(pgprot_user);
66 EXPORT_SYMBOL(pgprot_kernel);
67
68 struct cachepolicy {
69 const char policy[16];
70 unsigned int cr_mask;
71 pmdval_t pmd;
72 pteval_t pte;
73 pteval_t pte_s2;
74 };
75
76 #ifdef CONFIG_ARM_LPAE
77 #define s2_policy(policy) policy
78 #else
79 #define s2_policy(policy) 0
80 #endif
81
82 static struct cachepolicy cache_policies[] __initdata = {
83 {
84 .policy = "uncached",
85 .cr_mask = CR_W|CR_C,
86 .pmd = PMD_SECT_UNCACHED,
87 .pte = L_PTE_MT_UNCACHED,
88 .pte_s2 = s2_policy(L_PTE_S2_MT_UNCACHED),
89 }, {
90 .policy = "buffered",
91 .cr_mask = CR_C,
92 .pmd = PMD_SECT_BUFFERED,
93 .pte = L_PTE_MT_BUFFERABLE,
94 .pte_s2 = s2_policy(L_PTE_S2_MT_UNCACHED),
95 }, {
96 .policy = "writethrough",
97 .cr_mask = 0,
98 .pmd = PMD_SECT_WT,
99 .pte = L_PTE_MT_WRITETHROUGH,
100 .pte_s2 = s2_policy(L_PTE_S2_MT_WRITETHROUGH),
101 }, {
102 .policy = "writeback",
103 .cr_mask = 0,
104 .pmd = PMD_SECT_WB,
105 .pte = L_PTE_MT_WRITEBACK,
106 .pte_s2 = s2_policy(L_PTE_S2_MT_WRITEBACK),
107 }, {
108 .policy = "writealloc",
109 .cr_mask = 0,
110 .pmd = PMD_SECT_WBWA,
111 .pte = L_PTE_MT_WRITEALLOC,
112 .pte_s2 = s2_policy(L_PTE_S2_MT_WRITEBACK),
113 }
114 };
115
116 #ifdef CONFIG_CPU_CP15
117 /*
118 * These are useful for identifying cache coherency
119 * problems by allowing the cache or the cache and
120 * writebuffer to be turned off. (Note: the write
121 * buffer should not be on and the cache off).
122 */
123 static int __init early_cachepolicy(char *p)
124 {
125 int i;
126
127 for (i = 0; i < ARRAY_SIZE(cache_policies); i++) {
128 int len = strlen(cache_policies[i].policy);
129
130 if (memcmp(p, cache_policies[i].policy, len) == 0) {
131 cachepolicy = i;
132 cr_alignment &= ~cache_policies[i].cr_mask;
133 cr_no_alignment &= ~cache_policies[i].cr_mask;
134 break;
135 }
136 }
137 if (i == ARRAY_SIZE(cache_policies))
138 printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n");
139 /*
140 * This restriction is partly to do with the way we boot; it is
141 * unpredictable to have memory mapped using two different sets of
142 * memory attributes (shared, type, and cache attribs). We can not
143 * change these attributes once the initial assembly has setup the
144 * page tables.
145 */
146 if (cpu_architecture() >= CPU_ARCH_ARMv6) {
147 printk(KERN_WARNING "Only cachepolicy=writeback supported on ARMv6 and later\n");
148 cachepolicy = CPOLICY_WRITEBACK;
149 }
150 flush_cache_all();
151 set_cr(cr_alignment);
152 return 0;
153 }
154 early_param("cachepolicy", early_cachepolicy);
155
156 static int __init early_nocache(char *__unused)
157 {
158 char *p = "buffered";
159 printk(KERN_WARNING "nocache is deprecated; use cachepolicy=%s\n", p);
160 early_cachepolicy(p);
161 return 0;
162 }
163 early_param("nocache", early_nocache);
164
165 static int __init early_nowrite(char *__unused)
166 {
167 char *p = "uncached";
168 printk(KERN_WARNING "nowb is deprecated; use cachepolicy=%s\n", p);
169 early_cachepolicy(p);
170 return 0;
171 }
172 early_param("nowb", early_nowrite);
173
174 #ifndef CONFIG_ARM_LPAE
175 static int __init early_ecc(char *p)
176 {
177 if (memcmp(p, "on", 2) == 0)
178 ecc_mask = PMD_PROTECTION;
179 else if (memcmp(p, "off", 3) == 0)
180 ecc_mask = 0;
181 return 0;
182 }
183 early_param("ecc", early_ecc);
184 #endif
185
186 static int __init noalign_setup(char *__unused)
187 {
188 cr_alignment &= ~CR_A;
189 cr_no_alignment &= ~CR_A;
190 set_cr(cr_alignment);
191 return 1;
192 }
193 __setup("noalign", noalign_setup);
194
195 #ifndef CONFIG_SMP
196 void adjust_cr(unsigned long mask, unsigned long set)
197 {
198 unsigned long flags;
199
200 mask &= ~CR_A;
201
202 set &= mask;
203
204 local_irq_save(flags);
205
206 cr_no_alignment = (cr_no_alignment & ~mask) | set;
207 cr_alignment = (cr_alignment & ~mask) | set;
208
209 set_cr((get_cr() & ~mask) | set);
210
211 local_irq_restore(flags);
212 }
213 #endif
214
215 #else /* ifdef CONFIG_CPU_CP15 */
216
217 static int __init early_cachepolicy(char *p)
218 {
219 pr_warning("cachepolicy kernel parameter not supported without cp15\n");
220 }
221 early_param("cachepolicy", early_cachepolicy);
222
223 static int __init noalign_setup(char *__unused)
224 {
225 pr_warning("noalign kernel parameter not supported without cp15\n");
226 }
227 __setup("noalign", noalign_setup);
228
229 #endif /* ifdef CONFIG_CPU_CP15 / else */
230
231 #define PROT_PTE_DEVICE L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_XN
232 #define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_AP_WRITE
233
234 static struct mem_type mem_types[] = {
235 [MT_DEVICE] = { /* Strongly ordered / ARMv6 shared device */
236 .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
237 L_PTE_SHARED,
238 .prot_l1 = PMD_TYPE_TABLE,
239 .prot_sect = PROT_SECT_DEVICE | PMD_SECT_S,
240 .domain = DOMAIN_IO,
241 },
242 [MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
243 .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_NONSHARED,
244 .prot_l1 = PMD_TYPE_TABLE,
245 .prot_sect = PROT_SECT_DEVICE,
246 .domain = DOMAIN_IO,
247 },
248 [MT_DEVICE_CACHED] = { /* ioremap_cached */
249 .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_CACHED,
250 .prot_l1 = PMD_TYPE_TABLE,
251 .prot_sect = PROT_SECT_DEVICE | PMD_SECT_WB,
252 .domain = DOMAIN_IO,
253 },
254 [MT_DEVICE_WC] = { /* ioremap_wc */
255 .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
256 .prot_l1 = PMD_TYPE_TABLE,
257 .prot_sect = PROT_SECT_DEVICE,
258 .domain = DOMAIN_IO,
259 },
260 [MT_UNCACHED] = {
261 .prot_pte = PROT_PTE_DEVICE,
262 .prot_l1 = PMD_TYPE_TABLE,
263 .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
264 .domain = DOMAIN_IO,
265 },
266 [MT_CACHECLEAN] = {
267 .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
268 .domain = DOMAIN_KERNEL,
269 },
270 #ifndef CONFIG_ARM_LPAE
271 [MT_MINICLEAN] = {
272 .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_MINICACHE,
273 .domain = DOMAIN_KERNEL,
274 },
275 #endif
276 [MT_LOW_VECTORS] = {
277 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
278 L_PTE_RDONLY,
279 .prot_l1 = PMD_TYPE_TABLE,
280 .domain = DOMAIN_USER,
281 },
282 [MT_HIGH_VECTORS] = {
283 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
284 L_PTE_USER | L_PTE_RDONLY,
285 .prot_l1 = PMD_TYPE_TABLE,
286 .domain = DOMAIN_USER,
287 },
288 [MT_MEMORY] = {
289 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY,
290 .prot_l1 = PMD_TYPE_TABLE,
291 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
292 .domain = DOMAIN_KERNEL,
293 },
294 [MT_ROM] = {
295 .prot_sect = PMD_TYPE_SECT,
296 .domain = DOMAIN_KERNEL,
297 },
298 [MT_MEMORY_NONCACHED] = {
299 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
300 L_PTE_MT_BUFFERABLE,
301 .prot_l1 = PMD_TYPE_TABLE,
302 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
303 .domain = DOMAIN_KERNEL,
304 },
305 [MT_MEMORY_DTCM] = {
306 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
307 L_PTE_XN,
308 .prot_l1 = PMD_TYPE_TABLE,
309 .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
310 .domain = DOMAIN_KERNEL,
311 },
312 [MT_MEMORY_ITCM] = {
313 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY,
314 .prot_l1 = PMD_TYPE_TABLE,
315 .domain = DOMAIN_KERNEL,
316 },
317 [MT_MEMORY_SO] = {
318 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
319 L_PTE_MT_UNCACHED | L_PTE_XN,
320 .prot_l1 = PMD_TYPE_TABLE,
321 .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_S |
322 PMD_SECT_UNCACHED | PMD_SECT_XN,
323 .domain = DOMAIN_KERNEL,
324 },
325 [MT_MEMORY_DMA_READY] = {
326 .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY,
327 .prot_l1 = PMD_TYPE_TABLE,
328 .domain = DOMAIN_KERNEL,
329 },
330 };
331
332 const struct mem_type *get_mem_type(unsigned int type)
333 {
334 return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL;
335 }
336 EXPORT_SYMBOL(get_mem_type);
337
338 /*
339 * Adjust the PMD section entries according to the CPU in use.
340 */
341 static void __init build_mem_type_table(void)
342 {
343 struct cachepolicy *cp;
344 unsigned int cr = get_cr();
345 pteval_t user_pgprot, kern_pgprot, vecs_pgprot;
346 pteval_t hyp_device_pgprot, s2_pgprot, s2_device_pgprot;
347 int cpu_arch = cpu_architecture();
348 int i;
349
350 if (cpu_arch < CPU_ARCH_ARMv6) {
351 #if defined(CONFIG_CPU_DCACHE_DISABLE)
352 if (cachepolicy > CPOLICY_BUFFERED)
353 cachepolicy = CPOLICY_BUFFERED;
354 #elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH)
355 if (cachepolicy > CPOLICY_WRITETHROUGH)
356 cachepolicy = CPOLICY_WRITETHROUGH;
357 #endif
358 }
359 if (cpu_arch < CPU_ARCH_ARMv5) {
360 if (cachepolicy >= CPOLICY_WRITEALLOC)
361 cachepolicy = CPOLICY_WRITEBACK;
362 ecc_mask = 0;
363 }
364 if (is_smp())
365 cachepolicy = CPOLICY_WRITEALLOC;
366
367 /*
368 * Strip out features not present on earlier architectures.
369 * Pre-ARMv5 CPUs don't have TEX bits. Pre-ARMv6 CPUs or those
370 * without extended page tables don't have the 'Shared' bit.
371 */
372 if (cpu_arch < CPU_ARCH_ARMv5)
373 for (i = 0; i < ARRAY_SIZE(mem_types); i++)
374 mem_types[i].prot_sect &= ~PMD_SECT_TEX(7);
375 if ((cpu_arch < CPU_ARCH_ARMv6 || !(cr & CR_XP)) && !cpu_is_xsc3())
376 for (i = 0; i < ARRAY_SIZE(mem_types); i++)
377 mem_types[i].prot_sect &= ~PMD_SECT_S;
378
379 /*
380 * ARMv5 and lower, bit 4 must be set for page tables (was: cache
381 * "update-able on write" bit on ARM610). However, Xscale and
382 * Xscale3 require this bit to be cleared.
383 */
384 if (cpu_is_xscale() || cpu_is_xsc3()) {
385 for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
386 mem_types[i].prot_sect &= ~PMD_BIT4;
387 mem_types[i].prot_l1 &= ~PMD_BIT4;
388 }
389 } else if (cpu_arch < CPU_ARCH_ARMv6) {
390 for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
391 if (mem_types[i].prot_l1)
392 mem_types[i].prot_l1 |= PMD_BIT4;
393 if (mem_types[i].prot_sect)
394 mem_types[i].prot_sect |= PMD_BIT4;
395 }
396 }
397
398 /*
399 * Mark the device areas according to the CPU/architecture.
400 */
401 if (cpu_is_xsc3() || (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP))) {
402 if (!cpu_is_xsc3()) {
403 /*
404 * Mark device regions on ARMv6+ as execute-never
405 * to prevent speculative instruction fetches.
406 */
407 mem_types[MT_DEVICE].prot_sect |= PMD_SECT_XN;
408 mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN;
409 mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN;
410 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN;
411 }
412 if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
413 /*
414 * For ARMv7 with TEX remapping,
415 * - shared device is SXCB=1100
416 * - nonshared device is SXCB=0100
417 * - write combine device mem is SXCB=0001
418 * (Uncached Normal memory)
419 */
420 mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1);
421 mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(1);
422 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
423 } else if (cpu_is_xsc3()) {
424 /*
425 * For Xscale3,
426 * - shared device is TEXCB=00101
427 * - nonshared device is TEXCB=01000
428 * - write combine device mem is TEXCB=00100
429 * (Inner/Outer Uncacheable in xsc3 parlance)
430 */
431 mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1) | PMD_SECT_BUFFERED;
432 mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
433 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
434 } else {
435 /*
436 * For ARMv6 and ARMv7 without TEX remapping,
437 * - shared device is TEXCB=00001
438 * - nonshared device is TEXCB=01000
439 * - write combine device mem is TEXCB=00100
440 * (Uncached Normal in ARMv6 parlance).
441 */
442 mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
443 mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
444 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
445 }
446 } else {
447 /*
448 * On others, write combining is "Uncached/Buffered"
449 */
450 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
451 }
452
453 /*
454 * Now deal with the memory-type mappings
455 */
456 cp = &cache_policies[cachepolicy];
457 vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
458 s2_pgprot = cp->pte_s2;
459 hyp_device_pgprot = s2_device_pgprot = mem_types[MT_DEVICE].prot_pte;
460
461 /*
462 * ARMv6 and above have extended page tables.
463 */
464 if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) {
465 #ifndef CONFIG_ARM_LPAE
466 /*
467 * Mark cache clean areas and XIP ROM read only
468 * from SVC mode and no access from userspace.
469 */
470 mem_types[MT_ROM].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
471 mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
472 mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
473 #endif
474
475 if (is_smp()) {
476 /*
477 * Mark memory with the "shared" attribute
478 * for SMP systems
479 */
480 user_pgprot |= L_PTE_SHARED;
481 kern_pgprot |= L_PTE_SHARED;
482 vecs_pgprot |= L_PTE_SHARED;
483 s2_pgprot |= L_PTE_SHARED;
484 mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_S;
485 mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_SHARED;
486 mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_S;
487 mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED;
488 mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
489 mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
490 mem_types[MT_MEMORY_DMA_READY].prot_pte |= L_PTE_SHARED;
491 mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
492 mem_types[MT_MEMORY_NONCACHED].prot_pte |= L_PTE_SHARED;
493 }
494 }
495
496 /*
497 * Non-cacheable Normal - intended for memory areas that must
498 * not cause dirty cache line writebacks when used
499 */
500 if (cpu_arch >= CPU_ARCH_ARMv6) {
501 if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
502 /* Non-cacheable Normal is XCB = 001 */
503 mem_types[MT_MEMORY_NONCACHED].prot_sect |=
504 PMD_SECT_BUFFERED;
505 } else {
506 /* For both ARMv6 and non-TEX-remapping ARMv7 */
507 mem_types[MT_MEMORY_NONCACHED].prot_sect |=
508 PMD_SECT_TEX(1);
509 }
510 } else {
511 mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_BUFFERABLE;
512 }
513
514 #ifdef CONFIG_ARM_LPAE
515 /*
516 * Do not generate access flag faults for the kernel mappings.
517 */
518 for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
519 mem_types[i].prot_pte |= PTE_EXT_AF;
520 if (mem_types[i].prot_sect)
521 mem_types[i].prot_sect |= PMD_SECT_AF;
522 }
523 kern_pgprot |= PTE_EXT_AF;
524 vecs_pgprot |= PTE_EXT_AF;
525 #endif
526
527 for (i = 0; i < 16; i++) {
528 pteval_t v = pgprot_val(protection_map[i]);
529 protection_map[i] = __pgprot(v | user_pgprot);
530 }
531
532 mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot;
533 mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot;
534
535 pgprot_user = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot);
536 pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |
537 L_PTE_DIRTY | kern_pgprot);
538 pgprot_s2 = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | s2_pgprot);
539 pgprot_s2_device = __pgprot(s2_device_pgprot);
540 pgprot_hyp_device = __pgprot(hyp_device_pgprot);
541
542 mem_types[MT_LOW_VECTORS].prot_l1 |= ecc_mask;
543 mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask;
544 mem_types[MT_MEMORY].prot_sect |= ecc_mask | cp->pmd;
545 mem_types[MT_MEMORY].prot_pte |= kern_pgprot;
546 mem_types[MT_MEMORY_DMA_READY].prot_pte |= kern_pgprot;
547 mem_types[MT_MEMORY_NONCACHED].prot_sect |= ecc_mask;
548 mem_types[MT_ROM].prot_sect |= cp->pmd;
549
550 switch (cp->pmd) {
551 case PMD_SECT_WT:
552 mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WT;
553 break;
554 case PMD_SECT_WB:
555 case PMD_SECT_WBWA:
556 mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WB;
557 break;
558 }
559 printk("Memory policy: ECC %sabled, Data cache %s\n",
560 ecc_mask ? "en" : "dis", cp->policy);
561
562 for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
563 struct mem_type *t = &mem_types[i];
564 if (t->prot_l1)
565 t->prot_l1 |= PMD_DOMAIN(t->domain);
566 if (t->prot_sect)
567 t->prot_sect |= PMD_DOMAIN(t->domain);
568 }
569 }
570
571 #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
572 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
573 unsigned long size, pgprot_t vma_prot)
574 {
575 if (!pfn_valid(pfn))
576 return pgprot_noncached(vma_prot);
577 else if (file->f_flags & O_SYNC)
578 return pgprot_writecombine(vma_prot);
579 return vma_prot;
580 }
581 EXPORT_SYMBOL(phys_mem_access_prot);
582 #endif
583
584 #define vectors_base() (vectors_high() ? 0xffff0000 : 0)
585
586 static void __init *early_alloc_aligned(unsigned long sz, unsigned long align)
587 {
588 void *ptr = __va(memblock_alloc(sz, align));
589 memset(ptr, 0, sz);
590 return ptr;
591 }
592
593 static void __init *early_alloc(unsigned long sz)
594 {
595 return early_alloc_aligned(sz, sz);
596 }
597
598 static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot)
599 {
600 if (pmd_none(*pmd)) {
601 pte_t *pte = early_alloc(PTE_HWTABLE_OFF + PTE_HWTABLE_SIZE);
602 __pmd_populate(pmd, __pa(pte), prot);
603 }
604 BUG_ON(pmd_bad(*pmd));
605 return pte_offset_kernel(pmd, addr);
606 }
607
608 static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr,
609 unsigned long end, unsigned long pfn,
610 const struct mem_type *type)
611 {
612 pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1);
613 do {
614 set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
615 pfn++;
616 } while (pte++, addr += PAGE_SIZE, addr != end);
617 }
618
619 static void __init map_init_section(pmd_t *pmd, unsigned long addr,
620 unsigned long end, phys_addr_t phys,
621 const struct mem_type *type)
622 {
623 #ifndef CONFIG_ARM_LPAE
624 /*
625 * In classic MMU format, puds and pmds are folded in to
626 * the pgds. pmd_offset gives the PGD entry. PGDs refer to a
627 * group of L1 entries making up one logical pointer to
628 * an L2 table (2MB), where as PMDs refer to the individual
629 * L1 entries (1MB). Hence increment to get the correct
630 * offset for odd 1MB sections.
631 * (See arch/arm/include/asm/pgtable-2level.h)
632 */
633 if (addr & SECTION_SIZE)
634 pmd++;
635 #endif
636 do {
637 *pmd = __pmd(phys | type->prot_sect);
638 phys += SECTION_SIZE;
639 } while (pmd++, addr += SECTION_SIZE, addr != end);
640
641 flush_pmd_entry(pmd);
642 }
643
644 static void __init alloc_init_pmd(pud_t *pud, unsigned long addr,
645 unsigned long end, phys_addr_t phys,
646 const struct mem_type *type)
647 {
648 pmd_t *pmd = pmd_offset(pud, addr);
649 unsigned long next;
650
651 do {
652 /*
653 * With LPAE, we must loop over to map
654 * all the pmds for the given range.
655 */
656 next = pmd_addr_end(addr, end);
657
658 /*
659 * Try a section mapping - addr, next and phys must all be
660 * aligned to a section boundary.
661 */
662 if (type->prot_sect &&
663 ((addr | next | phys) & ~SECTION_MASK) == 0) {
664 map_init_section(pmd, addr, next, phys, type);
665 } else {
666 alloc_init_pte(pmd, addr, next,
667 __phys_to_pfn(phys), type);
668 }
669
670 phys += next - addr;
671
672 } while (pmd++, addr = next, addr != end);
673 }
674
675 static void __init alloc_init_pud(pgd_t *pgd, unsigned long addr,
676 unsigned long end, unsigned long phys, const struct mem_type *type)
677 {
678 pud_t *pud = pud_offset(pgd, addr);
679 unsigned long next;
680
681 do {
682 next = pud_addr_end(addr, end);
683 alloc_init_pmd(pud, addr, next, phys, type);
684 phys += next - addr;
685 } while (pud++, addr = next, addr != end);
686 }
687
688 #ifndef CONFIG_ARM_LPAE
689 static void __init create_36bit_mapping(struct map_desc *md,
690 const struct mem_type *type)
691 {
692 unsigned long addr, length, end;
693 phys_addr_t phys;
694 pgd_t *pgd;
695
696 addr = md->virtual;
697 phys = __pfn_to_phys(md->pfn);
698 length = PAGE_ALIGN(md->length);
699
700 if (!(cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3())) {
701 printk(KERN_ERR "MM: CPU does not support supersection "
702 "mapping for 0x%08llx at 0x%08lx\n",
703 (long long)__pfn_to_phys((u64)md->pfn), addr);
704 return;
705 }
706
707 /* N.B. ARMv6 supersections are only defined to work with domain 0.
708 * Since domain assignments can in fact be arbitrary, the
709 * 'domain == 0' check below is required to insure that ARMv6
710 * supersections are only allocated for domain 0 regardless
711 * of the actual domain assignments in use.
712 */
713 if (type->domain) {
714 printk(KERN_ERR "MM: invalid domain in supersection "
715 "mapping for 0x%08llx at 0x%08lx\n",
716 (long long)__pfn_to_phys((u64)md->pfn), addr);
717 return;
718 }
719
720 if ((addr | length | __pfn_to_phys(md->pfn)) & ~SUPERSECTION_MASK) {
721 printk(KERN_ERR "MM: cannot create mapping for 0x%08llx"
722 " at 0x%08lx invalid alignment\n",
723 (long long)__pfn_to_phys((u64)md->pfn), addr);
724 return;
725 }
726
727 /*
728 * Shift bits [35:32] of address into bits [23:20] of PMD
729 * (See ARMv6 spec).
730 */
731 phys |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);
732
733 pgd = pgd_offset_k(addr);
734 end = addr + length;
735 do {
736 pud_t *pud = pud_offset(pgd, addr);
737 pmd_t *pmd = pmd_offset(pud, addr);
738 int i;
739
740 for (i = 0; i < 16; i++)
741 *pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER);
742
743 addr += SUPERSECTION_SIZE;
744 phys += SUPERSECTION_SIZE;
745 pgd += SUPERSECTION_SIZE >> PGDIR_SHIFT;
746 } while (addr != end);
747 }
748 #endif /* !CONFIG_ARM_LPAE */
749
750 /*
751 * Create the page directory entries and any necessary
752 * page tables for the mapping specified by `md'. We
753 * are able to cope here with varying sizes and address
754 * offsets, and we take full advantage of sections and
755 * supersections.
756 */
757 static void __init create_mapping(struct map_desc *md)
758 {
759 unsigned long addr, length, end;
760 phys_addr_t phys;
761 const struct mem_type *type;
762 pgd_t *pgd;
763
764 if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {
765 printk(KERN_WARNING "BUG: not creating mapping for 0x%08llx"
766 " at 0x%08lx in user region\n",
767 (long long)__pfn_to_phys((u64)md->pfn), md->virtual);
768 return;
769 }
770
771 if ((md->type == MT_DEVICE || md->type == MT_ROM) &&
772 md->virtual >= PAGE_OFFSET &&
773 (md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) {
774 printk(KERN_WARNING "BUG: mapping for 0x%08llx"
775 " at 0x%08lx out of vmalloc space\n",
776 (long long)__pfn_to_phys((u64)md->pfn), md->virtual);
777 }
778
779 type = &mem_types[md->type];
780
781 #ifndef CONFIG_ARM_LPAE
782 /*
783 * Catch 36-bit addresses
784 */
785 if (md->pfn >= 0x100000) {
786 create_36bit_mapping(md, type);
787 return;
788 }
789 #endif
790
791 addr = md->virtual & PAGE_MASK;
792 phys = __pfn_to_phys(md->pfn);
793 length = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));
794
795 if (type->prot_l1 == 0 && ((addr | phys | length) & ~SECTION_MASK)) {
796 printk(KERN_WARNING "BUG: map for 0x%08llx at 0x%08lx can not "
797 "be mapped using pages, ignoring.\n",
798 (long long)__pfn_to_phys(md->pfn), addr);
799 return;
800 }
801
802 pgd = pgd_offset_k(addr);
803 end = addr + length;
804 do {
805 unsigned long next = pgd_addr_end(addr, end);
806
807 alloc_init_pud(pgd, addr, next, phys, type);
808
809 phys += next - addr;
810 addr = next;
811 } while (pgd++, addr != end);
812 }
813
814 /*
815 * Create the architecture specific mappings
816 */
817 void __init iotable_init(struct map_desc *io_desc, int nr)
818 {
819 struct map_desc *md;
820 struct vm_struct *vm;
821 struct static_vm *svm;
822
823 if (!nr)
824 return;
825
826 svm = early_alloc_aligned(sizeof(*svm) * nr, __alignof__(*svm));
827
828 for (md = io_desc; nr; md++, nr--) {
829 create_mapping(md);
830
831 vm = &svm->vm;
832 vm->addr = (void *)(md->virtual & PAGE_MASK);
833 vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));
834 vm->phys_addr = __pfn_to_phys(md->pfn);
835 vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
836 vm->flags |= VM_ARM_MTYPE(md->type);
837 vm->caller = iotable_init;
838 add_static_vm_early(svm++);
839 }
840 }
841
842 void __init vm_reserve_area_early(unsigned long addr, unsigned long size,
843 void *caller)
844 {
845 struct vm_struct *vm;
846 struct static_vm *svm;
847
848 svm = early_alloc_aligned(sizeof(*svm), __alignof__(*svm));
849
850 vm = &svm->vm;
851 vm->addr = (void *)addr;
852 vm->size = size;
853 vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;
854 vm->caller = caller;
855 add_static_vm_early(svm);
856 }
857
858 #ifndef CONFIG_ARM_LPAE
859
860 /*
861 * The Linux PMD is made of two consecutive section entries covering 2MB
862 * (see definition in include/asm/pgtable-2level.h). However a call to
863 * create_mapping() may optimize static mappings by using individual
864 * 1MB section mappings. This leaves the actual PMD potentially half
865 * initialized if the top or bottom section entry isn't used, leaving it
866 * open to problems if a subsequent ioremap() or vmalloc() tries to use
867 * the virtual space left free by that unused section entry.
868 *
869 * Let's avoid the issue by inserting dummy vm entries covering the unused
870 * PMD halves once the static mappings are in place.
871 */
872
873 static void __init pmd_empty_section_gap(unsigned long addr)
874 {
875 vm_reserve_area_early(addr, SECTION_SIZE, pmd_empty_section_gap);
876 }
877
878 static void __init fill_pmd_gaps(void)
879 {
880 struct static_vm *svm;
881 struct vm_struct *vm;
882 unsigned long addr, next = 0;
883 pmd_t *pmd;
884
885 list_for_each_entry(svm, &static_vmlist, list) {
886 vm = &svm->vm;
887 addr = (unsigned long)vm->addr;
888 if (addr < next)
889 continue;
890
891 /*
892 * Check if this vm starts on an odd section boundary.
893 * If so and the first section entry for this PMD is free
894 * then we block the corresponding virtual address.
895 */
896 if ((addr & ~PMD_MASK) == SECTION_SIZE) {
897 pmd = pmd_off_k(addr);
898 if (pmd_none(*pmd))
899 pmd_empty_section_gap(addr & PMD_MASK);
900 }
901
902 /*
903 * Then check if this vm ends on an odd section boundary.
904 * If so and the second section entry for this PMD is empty
905 * then we block the corresponding virtual address.
906 */
907 addr += vm->size;
908 if ((addr & ~PMD_MASK) == SECTION_SIZE) {
909 pmd = pmd_off_k(addr) + 1;
910 if (pmd_none(*pmd))
911 pmd_empty_section_gap(addr);
912 }
913
914 /* no need to look at any vm entry until we hit the next PMD */
915 next = (addr + PMD_SIZE - 1) & PMD_MASK;
916 }
917 }
918
919 #else
920 #define fill_pmd_gaps() do { } while (0)
921 #endif
922
923 #if defined(CONFIG_PCI) && !defined(CONFIG_NEED_MACH_IO_H)
924 static void __init pci_reserve_io(void)
925 {
926 struct static_vm *svm;
927
928 svm = find_static_vm_vaddr((void *)PCI_IO_VIRT_BASE);
929 if (svm)
930 return;
931
932 vm_reserve_area_early(PCI_IO_VIRT_BASE, SZ_2M, pci_reserve_io);
933 }
934 #else
935 #define pci_reserve_io() do { } while (0)
936 #endif
937
938 #ifdef CONFIG_DEBUG_LL
939 void __init debug_ll_io_init(void)
940 {
941 struct map_desc map;
942
943 debug_ll_addr(&map.pfn, &map.virtual);
944 if (!map.pfn || !map.virtual)
945 return;
946 map.pfn = __phys_to_pfn(map.pfn);
947 map.virtual &= PAGE_MASK;
948 map.length = PAGE_SIZE;
949 map.type = MT_DEVICE;
950 create_mapping(&map);
951 }
952 #endif
953
954 static void * __initdata vmalloc_min =
955 (void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
956
957 /*
958 * vmalloc=size forces the vmalloc area to be exactly 'size'
959 * bytes. This can be used to increase (or decrease) the vmalloc
960 * area - the default is 240m.
961 */
962 static int __init early_vmalloc(char *arg)
963 {
964 unsigned long vmalloc_reserve = memparse(arg, NULL);
965
966 if (vmalloc_reserve < SZ_16M) {
967 vmalloc_reserve = SZ_16M;
968 printk(KERN_WARNING
969 "vmalloc area too small, limiting to %luMB\n",
970 vmalloc_reserve >> 20);
971 }
972
973 if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) {
974 vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M);
975 printk(KERN_WARNING
976 "vmalloc area is too big, limiting to %luMB\n",
977 vmalloc_reserve >> 20);
978 }
979
980 vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve);
981 return 0;
982 }
983 early_param("vmalloc", early_vmalloc);
984
985 phys_addr_t arm_lowmem_limit __initdata = 0;
986
987 void __init sanity_check_meminfo(void)
988 {
989 int i, j, highmem = 0;
990
991 for (i = 0, j = 0; i < meminfo.nr_banks; i++) {
992 struct membank *bank = &meminfo.bank[j];
993 *bank = meminfo.bank[i];
994
995 if (bank->start > ULONG_MAX)
996 highmem = 1;
997
998 #ifdef CONFIG_HIGHMEM
999 if (__va(bank->start) >= vmalloc_min ||
1000 __va(bank->start) < (void *)PAGE_OFFSET)
1001 highmem = 1;
1002
1003 bank->highmem = highmem;
1004
1005 /*
1006 * Split those memory banks which are partially overlapping
1007 * the vmalloc area greatly simplifying things later.
1008 */
1009 if (!highmem && __va(bank->start) < vmalloc_min &&
1010 bank->size > vmalloc_min - __va(bank->start)) {
1011 if (meminfo.nr_banks >= NR_BANKS) {
1012 printk(KERN_CRIT "NR_BANKS too low, "
1013 "ignoring high memory\n");
1014 } else {
1015 memmove(bank + 1, bank,
1016 (meminfo.nr_banks - i) * sizeof(*bank));
1017 meminfo.nr_banks++;
1018 i++;
1019 bank[1].size -= vmalloc_min - __va(bank->start);
1020 bank[1].start = __pa(vmalloc_min - 1) + 1;
1021 bank[1].highmem = highmem = 1;
1022 j++;
1023 }
1024 bank->size = vmalloc_min - __va(bank->start);
1025 }
1026 #else
1027 bank->highmem = highmem;
1028
1029 /*
1030 * Highmem banks not allowed with !CONFIG_HIGHMEM.
1031 */
1032 if (highmem) {
1033 printk(KERN_NOTICE "Ignoring RAM at %.8llx-%.8llx "
1034 "(!CONFIG_HIGHMEM).\n",
1035 (unsigned long long)bank->start,
1036 (unsigned long long)bank->start + bank->size - 1);
1037 continue;
1038 }
1039
1040 /*
1041 * Check whether this memory bank would entirely overlap
1042 * the vmalloc area.
1043 */
1044 if (__va(bank->start) >= vmalloc_min ||
1045 __va(bank->start) < (void *)PAGE_OFFSET) {
1046 printk(KERN_NOTICE "Ignoring RAM at %.8llx-%.8llx "
1047 "(vmalloc region overlap).\n",
1048 (unsigned long long)bank->start,
1049 (unsigned long long)bank->start + bank->size - 1);
1050 continue;
1051 }
1052
1053 /*
1054 * Check whether this memory bank would partially overlap
1055 * the vmalloc area.
1056 */
1057 if (__va(bank->start + bank->size - 1) >= vmalloc_min ||
1058 __va(bank->start + bank->size - 1) <= __va(bank->start)) {
1059 unsigned long newsize = vmalloc_min - __va(bank->start);
1060 printk(KERN_NOTICE "Truncating RAM at %.8llx-%.8llx "
1061 "to -%.8llx (vmalloc region overlap).\n",
1062 (unsigned long long)bank->start,
1063 (unsigned long long)bank->start + bank->size - 1,
1064 (unsigned long long)bank->start + newsize - 1);
1065 bank->size = newsize;
1066 }
1067 #endif
1068 if (!bank->highmem && bank->start + bank->size > arm_lowmem_limit)
1069 arm_lowmem_limit = bank->start + bank->size;
1070
1071 j++;
1072 }
1073 #ifdef CONFIG_HIGHMEM
1074 if (highmem) {
1075 const char *reason = NULL;
1076
1077 if (cache_is_vipt_aliasing()) {
1078 /*
1079 * Interactions between kmap and other mappings
1080 * make highmem support with aliasing VIPT caches
1081 * rather difficult.
1082 */
1083 reason = "with VIPT aliasing cache";
1084 }
1085 if (reason) {
1086 printk(KERN_CRIT "HIGHMEM is not supported %s, ignoring high memory\n",
1087 reason);
1088 while (j > 0 && meminfo.bank[j - 1].highmem)
1089 j--;
1090 }
1091 }
1092 #endif
1093 meminfo.nr_banks = j;
1094 high_memory = __va(arm_lowmem_limit - 1) + 1;
1095 memblock_set_current_limit(arm_lowmem_limit);
1096 }
1097
1098 static inline void prepare_page_table(void)
1099 {
1100 unsigned long addr;
1101 phys_addr_t end;
1102
1103 /*
1104 * Clear out all the mappings below the kernel image.
1105 */
1106 for (addr = 0; addr < MODULES_VADDR; addr += PMD_SIZE)
1107 pmd_clear(pmd_off_k(addr));
1108
1109 #ifdef CONFIG_XIP_KERNEL
1110 /* The XIP kernel is mapped in the module area -- skip over it */
1111 addr = ((unsigned long)_etext + PMD_SIZE - 1) & PMD_MASK;
1112 #endif
1113 for ( ; addr < PAGE_OFFSET; addr += PMD_SIZE)
1114 pmd_clear(pmd_off_k(addr));
1115
1116 /*
1117 * Find the end of the first block of lowmem.
1118 */
1119 end = memblock.memory.regions[0].base + memblock.memory.regions[0].size;
1120 if (end >= arm_lowmem_limit)
1121 end = arm_lowmem_limit;
1122
1123 /*
1124 * Clear out all the kernel space mappings, except for the first
1125 * memory bank, up to the vmalloc region.
1126 */
1127 for (addr = __phys_to_virt(end);
1128 addr < VMALLOC_START; addr += PMD_SIZE)
1129 pmd_clear(pmd_off_k(addr));
1130 }
1131
1132 #ifdef CONFIG_ARM_LPAE
1133 /* the first page is reserved for pgd */
1134 #define SWAPPER_PG_DIR_SIZE (PAGE_SIZE + \
1135 PTRS_PER_PGD * PTRS_PER_PMD * sizeof(pmd_t))
1136 #else
1137 #define SWAPPER_PG_DIR_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
1138 #endif
1139
1140 /*
1141 * Reserve the special regions of memory
1142 */
1143 void __init arm_mm_memblock_reserve(void)
1144 {
1145 /*
1146 * Reserve the page tables. These are already in use,
1147 * and can only be in node 0.
1148 */
1149 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_PG_DIR_SIZE);
1150
1151 #ifdef CONFIG_SA1111
1152 /*
1153 * Because of the SA1111 DMA bug, we want to preserve our
1154 * precious DMA-able memory...
1155 */
1156 memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
1157 #endif
1158 }
1159
1160 /*
1161 * Set up the device mappings. Since we clear out the page tables for all
1162 * mappings above VMALLOC_START, we will remove any debug device mappings.
1163 * This means you have to be careful how you debug this function, or any
1164 * called function. This means you can't use any function or debugging
1165 * method which may touch any device, otherwise the kernel _will_ crash.
1166 */
1167 static void __init devicemaps_init(struct machine_desc *mdesc)
1168 {
1169 struct map_desc map;
1170 unsigned long addr;
1171 void *vectors;
1172
1173 /*
1174 * Allocate the vector page early.
1175 */
1176 vectors = early_alloc(PAGE_SIZE);
1177
1178 early_trap_init(vectors);
1179
1180 for (addr = VMALLOC_START; addr; addr += PMD_SIZE)
1181 pmd_clear(pmd_off_k(addr));
1182
1183 /*
1184 * Map the kernel if it is XIP.
1185 * It is always first in the modulearea.
1186 */
1187 #ifdef CONFIG_XIP_KERNEL
1188 map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
1189 map.virtual = MODULES_VADDR;
1190 map.length = ((unsigned long)_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
1191 map.type = MT_ROM;
1192 create_mapping(&map);
1193 #endif
1194
1195 /*
1196 * Map the cache flushing regions.
1197 */
1198 #ifdef FLUSH_BASE
1199 map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);
1200 map.virtual = FLUSH_BASE;
1201 map.length = SZ_1M;
1202 map.type = MT_CACHECLEAN;
1203 create_mapping(&map);
1204 #endif
1205 #ifdef FLUSH_BASE_MINICACHE
1206 map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);
1207 map.virtual = FLUSH_BASE_MINICACHE;
1208 map.length = SZ_1M;
1209 map.type = MT_MINICLEAN;
1210 create_mapping(&map);
1211 #endif
1212
1213 /*
1214 * Create a mapping for the machine vectors at the high-vectors
1215 * location (0xffff0000). If we aren't using high-vectors, also
1216 * create a mapping at the low-vectors virtual address.
1217 */
1218 map.pfn = __phys_to_pfn(virt_to_phys(vectors));
1219 map.virtual = 0xffff0000;
1220 map.length = PAGE_SIZE;
1221 map.type = MT_HIGH_VECTORS;
1222 create_mapping(&map);
1223
1224 if (!vectors_high()) {
1225 map.virtual = 0;
1226 map.type = MT_LOW_VECTORS;
1227 create_mapping(&map);
1228 }
1229
1230 /*
1231 * Ask the machine support to map in the statically mapped devices.
1232 */
1233 if (mdesc->map_io)
1234 mdesc->map_io();
1235 fill_pmd_gaps();
1236
1237 /* Reserve fixed i/o space in VMALLOC region */
1238 pci_reserve_io();
1239
1240 /*
1241 * Finally flush the caches and tlb to ensure that we're in a
1242 * consistent state wrt the writebuffer. This also ensures that
1243 * any write-allocated cache lines in the vector page are written
1244 * back. After this point, we can start to touch devices again.
1245 */
1246 local_flush_tlb_all();
1247 flush_cache_all();
1248 }
1249
1250 static void __init kmap_init(void)
1251 {
1252 #ifdef CONFIG_HIGHMEM
1253 pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE),
1254 PKMAP_BASE, _PAGE_KERNEL_TABLE);
1255 #endif
1256 }
1257
1258 static void __init map_lowmem(void)
1259 {
1260 struct memblock_region *reg;
1261
1262 /* Map all the lowmem memory banks. */
1263 for_each_memblock(memory, reg) {
1264 phys_addr_t start = reg->base;
1265 phys_addr_t end = start + reg->size;
1266 struct map_desc map;
1267
1268 if (end > arm_lowmem_limit)
1269 end = arm_lowmem_limit;
1270 if (start >= end)
1271 break;
1272
1273 map.pfn = __phys_to_pfn(start);
1274 map.virtual = __phys_to_virt(start);
1275 map.length = end - start;
1276 map.type = MT_MEMORY;
1277
1278 create_mapping(&map);
1279 }
1280 }
1281
1282 /*
1283 * paging_init() sets up the page tables, initialises the zone memory
1284 * maps, and sets up the zero page, bad page and bad page tables.
1285 */
1286 void __init paging_init(struct machine_desc *mdesc)
1287 {
1288 void *zero_page;
1289
1290 memblock_set_current_limit(arm_lowmem_limit);
1291
1292 build_mem_type_table();
1293 prepare_page_table();
1294 map_lowmem();
1295 dma_contiguous_remap();
1296 devicemaps_init(mdesc);
1297 kmap_init();
1298 tcm_init();
1299
1300 top_pmd = pmd_off_k(0xffff0000);
1301
1302 /* allocate the zero page. */
1303 zero_page = early_alloc(PAGE_SIZE);
1304
1305 bootmem_init();
1306
1307 empty_zero_page = virt_to_page(zero_page);
1308 __flush_dcache_page(NULL, empty_zero_page);
1309 }
Linux with added FPC-III support