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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> | |
d111e8f9 RK |
14 | #include <linux/mman.h> |
15 | #include <linux/nodemask.h> | |
2778f620 | 16 | #include <linux/memblock.h> |
ceb683d3 | 17 | #include <linux/sort.h> |
d111e8f9 | 18 | |
0ba8b9b2 | 19 | #include <asm/cputype.h> |
37efe642 | 20 | #include <asm/sections.h> |
3f973e22 | 21 | #include <asm/cachetype.h> |
d111e8f9 RK |
22 | #include <asm/setup.h> |
23 | #include <asm/sizes.h> | |
e616c591 | 24 | #include <asm/smp_plat.h> |
d111e8f9 | 25 | #include <asm/tlb.h> |
d73cd428 | 26 | #include <asm/highmem.h> |
d111e8f9 RK |
27 | |
28 | #include <asm/mach/arch.h> | |
29 | #include <asm/mach/map.h> | |
30 | ||
31 | #include "mm.h" | |
32 | ||
33 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
34 | ||
d111e8f9 RK |
35 | /* |
36 | * empty_zero_page is a special page that is used for | |
37 | * zero-initialized data and COW. | |
38 | */ | |
39 | struct page *empty_zero_page; | |
3653f3ab | 40 | EXPORT_SYMBOL(empty_zero_page); |
d111e8f9 RK |
41 | |
42 | /* | |
43 | * The pmd table for the upper-most set of pages. | |
44 | */ | |
45 | pmd_t *top_pmd; | |
46 | ||
ae8f1541 RK |
47 | #define CPOLICY_UNCACHED 0 |
48 | #define CPOLICY_BUFFERED 1 | |
49 | #define CPOLICY_WRITETHROUGH 2 | |
50 | #define CPOLICY_WRITEBACK 3 | |
51 | #define CPOLICY_WRITEALLOC 4 | |
52 | ||
53 | static unsigned int cachepolicy __initdata = CPOLICY_WRITEBACK; | |
54 | static unsigned int ecc_mask __initdata = 0; | |
44b18693 | 55 | pgprot_t pgprot_user; |
ae8f1541 RK |
56 | pgprot_t pgprot_kernel; |
57 | ||
44b18693 | 58 | EXPORT_SYMBOL(pgprot_user); |
ae8f1541 RK |
59 | EXPORT_SYMBOL(pgprot_kernel); |
60 | ||
61 | struct cachepolicy { | |
62 | const char policy[16]; | |
63 | unsigned int cr_mask; | |
64 | unsigned int pmd; | |
65 | unsigned int pte; | |
66 | }; | |
67 | ||
68 | static struct cachepolicy cache_policies[] __initdata = { | |
69 | { | |
70 | .policy = "uncached", | |
71 | .cr_mask = CR_W|CR_C, | |
72 | .pmd = PMD_SECT_UNCACHED, | |
bb30f36f | 73 | .pte = L_PTE_MT_UNCACHED, |
ae8f1541 RK |
74 | }, { |
75 | .policy = "buffered", | |
76 | .cr_mask = CR_C, | |
77 | .pmd = PMD_SECT_BUFFERED, | |
bb30f36f | 78 | .pte = L_PTE_MT_BUFFERABLE, |
ae8f1541 RK |
79 | }, { |
80 | .policy = "writethrough", | |
81 | .cr_mask = 0, | |
82 | .pmd = PMD_SECT_WT, | |
bb30f36f | 83 | .pte = L_PTE_MT_WRITETHROUGH, |
ae8f1541 RK |
84 | }, { |
85 | .policy = "writeback", | |
86 | .cr_mask = 0, | |
87 | .pmd = PMD_SECT_WB, | |
bb30f36f | 88 | .pte = L_PTE_MT_WRITEBACK, |
ae8f1541 RK |
89 | }, { |
90 | .policy = "writealloc", | |
91 | .cr_mask = 0, | |
92 | .pmd = PMD_SECT_WBWA, | |
bb30f36f | 93 | .pte = L_PTE_MT_WRITEALLOC, |
ae8f1541 RK |
94 | } |
95 | }; | |
96 | ||
97 | /* | |
6cbdc8c5 | 98 | * These are useful for identifying cache coherency |
ae8f1541 RK |
99 | * problems by allowing the cache or the cache and |
100 | * writebuffer to be turned off. (Note: the write | |
101 | * buffer should not be on and the cache off). | |
102 | */ | |
2b0d8c25 | 103 | static int __init early_cachepolicy(char *p) |
ae8f1541 RK |
104 | { |
105 | int i; | |
106 | ||
107 | for (i = 0; i < ARRAY_SIZE(cache_policies); i++) { | |
108 | int len = strlen(cache_policies[i].policy); | |
109 | ||
2b0d8c25 | 110 | if (memcmp(p, cache_policies[i].policy, len) == 0) { |
ae8f1541 RK |
111 | cachepolicy = i; |
112 | cr_alignment &= ~cache_policies[i].cr_mask; | |
113 | cr_no_alignment &= ~cache_policies[i].cr_mask; | |
ae8f1541 RK |
114 | break; |
115 | } | |
116 | } | |
117 | if (i == ARRAY_SIZE(cache_policies)) | |
118 | printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n"); | |
4b46d641 RK |
119 | /* |
120 | * This restriction is partly to do with the way we boot; it is | |
121 | * unpredictable to have memory mapped using two different sets of | |
122 | * memory attributes (shared, type, and cache attribs). We can not | |
123 | * change these attributes once the initial assembly has setup the | |
124 | * page tables. | |
125 | */ | |
11179d8c CM |
126 | if (cpu_architecture() >= CPU_ARCH_ARMv6) { |
127 | printk(KERN_WARNING "Only cachepolicy=writeback supported on ARMv6 and later\n"); | |
128 | cachepolicy = CPOLICY_WRITEBACK; | |
129 | } | |
ae8f1541 RK |
130 | flush_cache_all(); |
131 | set_cr(cr_alignment); | |
2b0d8c25 | 132 | return 0; |
ae8f1541 | 133 | } |
2b0d8c25 | 134 | early_param("cachepolicy", early_cachepolicy); |
ae8f1541 | 135 | |
2b0d8c25 | 136 | static int __init early_nocache(char *__unused) |
ae8f1541 RK |
137 | { |
138 | char *p = "buffered"; | |
139 | printk(KERN_WARNING "nocache is deprecated; use cachepolicy=%s\n", p); | |
2b0d8c25 JK |
140 | early_cachepolicy(p); |
141 | return 0; | |
ae8f1541 | 142 | } |
2b0d8c25 | 143 | early_param("nocache", early_nocache); |
ae8f1541 | 144 | |
2b0d8c25 | 145 | static int __init early_nowrite(char *__unused) |
ae8f1541 RK |
146 | { |
147 | char *p = "uncached"; | |
148 | printk(KERN_WARNING "nowb is deprecated; use cachepolicy=%s\n", p); | |
2b0d8c25 JK |
149 | early_cachepolicy(p); |
150 | return 0; | |
ae8f1541 | 151 | } |
2b0d8c25 | 152 | early_param("nowb", early_nowrite); |
ae8f1541 | 153 | |
2b0d8c25 | 154 | static int __init early_ecc(char *p) |
ae8f1541 | 155 | { |
2b0d8c25 | 156 | if (memcmp(p, "on", 2) == 0) |
ae8f1541 | 157 | ecc_mask = PMD_PROTECTION; |
2b0d8c25 | 158 | else if (memcmp(p, "off", 3) == 0) |
ae8f1541 | 159 | ecc_mask = 0; |
2b0d8c25 | 160 | return 0; |
ae8f1541 | 161 | } |
2b0d8c25 | 162 | early_param("ecc", early_ecc); |
ae8f1541 RK |
163 | |
164 | static int __init noalign_setup(char *__unused) | |
165 | { | |
166 | cr_alignment &= ~CR_A; | |
167 | cr_no_alignment &= ~CR_A; | |
168 | set_cr(cr_alignment); | |
169 | return 1; | |
170 | } | |
171 | __setup("noalign", noalign_setup); | |
172 | ||
255d1f86 RK |
173 | #ifndef CONFIG_SMP |
174 | void adjust_cr(unsigned long mask, unsigned long set) | |
175 | { | |
176 | unsigned long flags; | |
177 | ||
178 | mask &= ~CR_A; | |
179 | ||
180 | set &= mask; | |
181 | ||
182 | local_irq_save(flags); | |
183 | ||
184 | cr_no_alignment = (cr_no_alignment & ~mask) | set; | |
185 | cr_alignment = (cr_alignment & ~mask) | set; | |
186 | ||
187 | set_cr((get_cr() & ~mask) | set); | |
188 | ||
189 | local_irq_restore(flags); | |
190 | } | |
191 | #endif | |
192 | ||
0af92bef | 193 | #define PROT_PTE_DEVICE L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_WRITE |
b1cce6b1 | 194 | #define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_AP_WRITE |
0af92bef | 195 | |
b29e9f5e | 196 | static struct mem_type mem_types[] = { |
0af92bef | 197 | [MT_DEVICE] = { /* Strongly ordered / ARMv6 shared device */ |
bb30f36f RK |
198 | .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED | |
199 | L_PTE_SHARED, | |
0af92bef | 200 | .prot_l1 = PMD_TYPE_TABLE, |
b1cce6b1 | 201 | .prot_sect = PROT_SECT_DEVICE | PMD_SECT_S, |
0af92bef RK |
202 | .domain = DOMAIN_IO, |
203 | }, | |
204 | [MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */ | |
bb30f36f | 205 | .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_NONSHARED, |
0af92bef | 206 | .prot_l1 = PMD_TYPE_TABLE, |
b1cce6b1 | 207 | .prot_sect = PROT_SECT_DEVICE, |
0af92bef RK |
208 | .domain = DOMAIN_IO, |
209 | }, | |
210 | [MT_DEVICE_CACHED] = { /* ioremap_cached */ | |
bb30f36f | 211 | .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_CACHED, |
0af92bef RK |
212 | .prot_l1 = PMD_TYPE_TABLE, |
213 | .prot_sect = PROT_SECT_DEVICE | PMD_SECT_WB, | |
214 | .domain = DOMAIN_IO, | |
215 | }, | |
1ad77a87 | 216 | [MT_DEVICE_WC] = { /* ioremap_wc */ |
bb30f36f | 217 | .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_WC, |
0af92bef | 218 | .prot_l1 = PMD_TYPE_TABLE, |
b1cce6b1 | 219 | .prot_sect = PROT_SECT_DEVICE, |
0af92bef | 220 | .domain = DOMAIN_IO, |
ae8f1541 | 221 | }, |
ebb4c658 RK |
222 | [MT_UNCACHED] = { |
223 | .prot_pte = PROT_PTE_DEVICE, | |
224 | .prot_l1 = PMD_TYPE_TABLE, | |
225 | .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN, | |
226 | .domain = DOMAIN_IO, | |
227 | }, | |
ae8f1541 | 228 | [MT_CACHECLEAN] = { |
9ef79635 | 229 | .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN, |
ae8f1541 RK |
230 | .domain = DOMAIN_KERNEL, |
231 | }, | |
232 | [MT_MINICLEAN] = { | |
9ef79635 | 233 | .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_MINICACHE, |
ae8f1541 RK |
234 | .domain = DOMAIN_KERNEL, |
235 | }, | |
236 | [MT_LOW_VECTORS] = { | |
237 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
238 | L_PTE_EXEC, | |
239 | .prot_l1 = PMD_TYPE_TABLE, | |
240 | .domain = DOMAIN_USER, | |
241 | }, | |
242 | [MT_HIGH_VECTORS] = { | |
243 | .prot_pte = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | | |
244 | L_PTE_USER | L_PTE_EXEC, | |
245 | .prot_l1 = PMD_TYPE_TABLE, | |
246 | .domain = DOMAIN_USER, | |
247 | }, | |
248 | [MT_MEMORY] = { | |
9ef79635 | 249 | .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE, |
ae8f1541 RK |
250 | .domain = DOMAIN_KERNEL, |
251 | }, | |
252 | [MT_ROM] = { | |
9ef79635 | 253 | .prot_sect = PMD_TYPE_SECT, |
ae8f1541 RK |
254 | .domain = DOMAIN_KERNEL, |
255 | }, | |
e4707dd3 PW |
256 | [MT_MEMORY_NONCACHED] = { |
257 | .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE, | |
258 | .domain = DOMAIN_KERNEL, | |
259 | }, | |
ae8f1541 RK |
260 | }; |
261 | ||
b29e9f5e RK |
262 | const struct mem_type *get_mem_type(unsigned int type) |
263 | { | |
264 | return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL; | |
265 | } | |
69d3a84a | 266 | EXPORT_SYMBOL(get_mem_type); |
b29e9f5e | 267 | |
ae8f1541 RK |
268 | /* |
269 | * Adjust the PMD section entries according to the CPU in use. | |
270 | */ | |
271 | static void __init build_mem_type_table(void) | |
272 | { | |
273 | struct cachepolicy *cp; | |
274 | unsigned int cr = get_cr(); | |
bb30f36f | 275 | unsigned int user_pgprot, kern_pgprot, vecs_pgprot; |
ae8f1541 RK |
276 | int cpu_arch = cpu_architecture(); |
277 | int i; | |
278 | ||
11179d8c | 279 | if (cpu_arch < CPU_ARCH_ARMv6) { |
ae8f1541 | 280 | #if defined(CONFIG_CPU_DCACHE_DISABLE) |
11179d8c CM |
281 | if (cachepolicy > CPOLICY_BUFFERED) |
282 | cachepolicy = CPOLICY_BUFFERED; | |
ae8f1541 | 283 | #elif defined(CONFIG_CPU_DCACHE_WRITETHROUGH) |
11179d8c CM |
284 | if (cachepolicy > CPOLICY_WRITETHROUGH) |
285 | cachepolicy = CPOLICY_WRITETHROUGH; | |
ae8f1541 | 286 | #endif |
11179d8c | 287 | } |
ae8f1541 RK |
288 | if (cpu_arch < CPU_ARCH_ARMv5) { |
289 | if (cachepolicy >= CPOLICY_WRITEALLOC) | |
290 | cachepolicy = CPOLICY_WRITEBACK; | |
291 | ecc_mask = 0; | |
292 | } | |
bb30f36f RK |
293 | #ifdef CONFIG_SMP |
294 | cachepolicy = CPOLICY_WRITEALLOC; | |
295 | #endif | |
ae8f1541 | 296 | |
1ad77a87 | 297 | /* |
b1cce6b1 RK |
298 | * Strip out features not present on earlier architectures. |
299 | * Pre-ARMv5 CPUs don't have TEX bits. Pre-ARMv6 CPUs or those | |
300 | * without extended page tables don't have the 'Shared' bit. | |
1ad77a87 | 301 | */ |
b1cce6b1 RK |
302 | if (cpu_arch < CPU_ARCH_ARMv5) |
303 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) | |
304 | mem_types[i].prot_sect &= ~PMD_SECT_TEX(7); | |
305 | if ((cpu_arch < CPU_ARCH_ARMv6 || !(cr & CR_XP)) && !cpu_is_xsc3()) | |
306 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) | |
307 | mem_types[i].prot_sect &= ~PMD_SECT_S; | |
ae8f1541 RK |
308 | |
309 | /* | |
b1cce6b1 RK |
310 | * ARMv5 and lower, bit 4 must be set for page tables (was: cache |
311 | * "update-able on write" bit on ARM610). However, Xscale and | |
312 | * Xscale3 require this bit to be cleared. | |
ae8f1541 | 313 | */ |
b1cce6b1 | 314 | if (cpu_is_xscale() || cpu_is_xsc3()) { |
9ef79635 | 315 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) { |
ae8f1541 | 316 | mem_types[i].prot_sect &= ~PMD_BIT4; |
9ef79635 RK |
317 | mem_types[i].prot_l1 &= ~PMD_BIT4; |
318 | } | |
319 | } else if (cpu_arch < CPU_ARCH_ARMv6) { | |
320 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) { | |
ae8f1541 RK |
321 | if (mem_types[i].prot_l1) |
322 | mem_types[i].prot_l1 |= PMD_BIT4; | |
9ef79635 RK |
323 | if (mem_types[i].prot_sect) |
324 | mem_types[i].prot_sect |= PMD_BIT4; | |
325 | } | |
326 | } | |
ae8f1541 | 327 | |
b1cce6b1 RK |
328 | /* |
329 | * Mark the device areas according to the CPU/architecture. | |
330 | */ | |
331 | if (cpu_is_xsc3() || (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP))) { | |
332 | if (!cpu_is_xsc3()) { | |
333 | /* | |
334 | * Mark device regions on ARMv6+ as execute-never | |
335 | * to prevent speculative instruction fetches. | |
336 | */ | |
337 | mem_types[MT_DEVICE].prot_sect |= PMD_SECT_XN; | |
338 | mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN; | |
339 | mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN; | |
340 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN; | |
341 | } | |
342 | if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) { | |
343 | /* | |
344 | * For ARMv7 with TEX remapping, | |
345 | * - shared device is SXCB=1100 | |
346 | * - nonshared device is SXCB=0100 | |
347 | * - write combine device mem is SXCB=0001 | |
348 | * (Uncached Normal memory) | |
349 | */ | |
350 | mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1); | |
351 | mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(1); | |
352 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE; | |
353 | } else if (cpu_is_xsc3()) { | |
354 | /* | |
355 | * For Xscale3, | |
356 | * - shared device is TEXCB=00101 | |
357 | * - nonshared device is TEXCB=01000 | |
358 | * - write combine device mem is TEXCB=00100 | |
359 | * (Inner/Outer Uncacheable in xsc3 parlance) | |
360 | */ | |
361 | mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1) | PMD_SECT_BUFFERED; | |
362 | mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2); | |
363 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1); | |
364 | } else { | |
365 | /* | |
366 | * For ARMv6 and ARMv7 without TEX remapping, | |
367 | * - shared device is TEXCB=00001 | |
368 | * - nonshared device is TEXCB=01000 | |
369 | * - write combine device mem is TEXCB=00100 | |
370 | * (Uncached Normal in ARMv6 parlance). | |
371 | */ | |
372 | mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED; | |
373 | mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2); | |
374 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1); | |
375 | } | |
376 | } else { | |
377 | /* | |
378 | * On others, write combining is "Uncached/Buffered" | |
379 | */ | |
380 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Now deal with the memory-type mappings | |
385 | */ | |
ae8f1541 | 386 | cp = &cache_policies[cachepolicy]; |
bb30f36f RK |
387 | vecs_pgprot = kern_pgprot = user_pgprot = cp->pte; |
388 | ||
389 | #ifndef CONFIG_SMP | |
390 | /* | |
391 | * Only use write-through for non-SMP systems | |
392 | */ | |
393 | if (cpu_arch >= CPU_ARCH_ARMv5 && cachepolicy > CPOLICY_WRITETHROUGH) | |
394 | vecs_pgprot = cache_policies[CPOLICY_WRITETHROUGH].pte; | |
395 | #endif | |
ae8f1541 RK |
396 | |
397 | /* | |
398 | * Enable CPU-specific coherency if supported. | |
399 | * (Only available on XSC3 at the moment.) | |
400 | */ | |
b1cce6b1 RK |
401 | if (arch_is_coherent() && cpu_is_xsc3()) |
402 | mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S; | |
ae8f1541 RK |
403 | |
404 | /* | |
405 | * ARMv6 and above have extended page tables. | |
406 | */ | |
407 | if (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP)) { | |
ae8f1541 RK |
408 | /* |
409 | * Mark cache clean areas and XIP ROM read only | |
410 | * from SVC mode and no access from userspace. | |
411 | */ | |
412 | mem_types[MT_ROM].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
413 | mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
414 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE; | |
415 | ||
ae8f1541 RK |
416 | #ifdef CONFIG_SMP |
417 | /* | |
418 | * Mark memory with the "shared" attribute for SMP systems | |
419 | */ | |
420 | user_pgprot |= L_PTE_SHARED; | |
421 | kern_pgprot |= L_PTE_SHARED; | |
bb30f36f | 422 | vecs_pgprot |= L_PTE_SHARED; |
85b3cce8 RK |
423 | mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_S; |
424 | mem_types[MT_DEVICE_WC].prot_pte |= L_PTE_SHARED; | |
425 | mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_S; | |
426 | mem_types[MT_DEVICE_CACHED].prot_pte |= L_PTE_SHARED; | |
ae8f1541 | 427 | mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S; |
e4707dd3 | 428 | mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S; |
ae8f1541 RK |
429 | #endif |
430 | } | |
431 | ||
e4707dd3 PW |
432 | /* |
433 | * Non-cacheable Normal - intended for memory areas that must | |
434 | * not cause dirty cache line writebacks when used | |
435 | */ | |
436 | if (cpu_arch >= CPU_ARCH_ARMv6) { | |
437 | if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) { | |
438 | /* Non-cacheable Normal is XCB = 001 */ | |
439 | mem_types[MT_MEMORY_NONCACHED].prot_sect |= | |
440 | PMD_SECT_BUFFERED; | |
441 | } else { | |
442 | /* For both ARMv6 and non-TEX-remapping ARMv7 */ | |
443 | mem_types[MT_MEMORY_NONCACHED].prot_sect |= | |
444 | PMD_SECT_TEX(1); | |
445 | } | |
446 | } else { | |
447 | mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_BUFFERABLE; | |
448 | } | |
449 | ||
ae8f1541 RK |
450 | for (i = 0; i < 16; i++) { |
451 | unsigned long v = pgprot_val(protection_map[i]); | |
bb30f36f | 452 | protection_map[i] = __pgprot(v | user_pgprot); |
ae8f1541 RK |
453 | } |
454 | ||
bb30f36f RK |
455 | mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot; |
456 | mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot; | |
ae8f1541 | 457 | |
44b18693 | 458 | pgprot_user = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot); |
ae8f1541 | 459 | pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | |
6dc995a3 | 460 | L_PTE_DIRTY | L_PTE_WRITE | kern_pgprot); |
ae8f1541 RK |
461 | |
462 | mem_types[MT_LOW_VECTORS].prot_l1 |= ecc_mask; | |
463 | mem_types[MT_HIGH_VECTORS].prot_l1 |= ecc_mask; | |
464 | mem_types[MT_MEMORY].prot_sect |= ecc_mask | cp->pmd; | |
465 | mem_types[MT_ROM].prot_sect |= cp->pmd; | |
466 | ||
467 | switch (cp->pmd) { | |
468 | case PMD_SECT_WT: | |
469 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WT; | |
470 | break; | |
471 | case PMD_SECT_WB: | |
472 | case PMD_SECT_WBWA: | |
473 | mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_WB; | |
474 | break; | |
475 | } | |
476 | printk("Memory policy: ECC %sabled, Data cache %s\n", | |
477 | ecc_mask ? "en" : "dis", cp->policy); | |
2497f0a8 RK |
478 | |
479 | for (i = 0; i < ARRAY_SIZE(mem_types); i++) { | |
480 | struct mem_type *t = &mem_types[i]; | |
481 | if (t->prot_l1) | |
482 | t->prot_l1 |= PMD_DOMAIN(t->domain); | |
483 | if (t->prot_sect) | |
484 | t->prot_sect |= PMD_DOMAIN(t->domain); | |
485 | } | |
ae8f1541 RK |
486 | } |
487 | ||
488 | #define vectors_base() (vectors_high() ? 0xffff0000 : 0) | |
489 | ||
3abe9d33 RK |
490 | static void __init *early_alloc(unsigned long sz) |
491 | { | |
2778f620 RK |
492 | void *ptr = __va(memblock_alloc(sz, sz)); |
493 | memset(ptr, 0, sz); | |
494 | return ptr; | |
3abe9d33 RK |
495 | } |
496 | ||
4bb2e27d | 497 | static pte_t * __init early_pte_alloc(pmd_t *pmd, unsigned long addr, unsigned long prot) |
ae8f1541 | 498 | { |
24e6c699 | 499 | if (pmd_none(*pmd)) { |
4bb2e27d RK |
500 | pte_t *pte = early_alloc(2 * PTRS_PER_PTE * sizeof(pte_t)); |
501 | __pmd_populate(pmd, __pa(pte) | prot); | |
24e6c699 | 502 | } |
4bb2e27d RK |
503 | BUG_ON(pmd_bad(*pmd)); |
504 | return pte_offset_kernel(pmd, addr); | |
505 | } | |
ae8f1541 | 506 | |
4bb2e27d RK |
507 | static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr, |
508 | unsigned long end, unsigned long pfn, | |
509 | const struct mem_type *type) | |
510 | { | |
511 | pte_t *pte = early_pte_alloc(pmd, addr, type->prot_l1); | |
24e6c699 | 512 | do { |
40d192b6 | 513 | set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0); |
24e6c699 RK |
514 | pfn++; |
515 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
ae8f1541 RK |
516 | } |
517 | ||
24e6c699 RK |
518 | static void __init alloc_init_section(pgd_t *pgd, unsigned long addr, |
519 | unsigned long end, unsigned long phys, | |
520 | const struct mem_type *type) | |
ae8f1541 | 521 | { |
24e6c699 | 522 | pmd_t *pmd = pmd_offset(pgd, addr); |
ae8f1541 | 523 | |
24e6c699 RK |
524 | /* |
525 | * Try a section mapping - end, addr and phys must all be aligned | |
526 | * to a section boundary. Note that PMDs refer to the individual | |
527 | * L1 entries, whereas PGDs refer to a group of L1 entries making | |
528 | * up one logical pointer to an L2 table. | |
529 | */ | |
530 | if (((addr | end | phys) & ~SECTION_MASK) == 0) { | |
531 | pmd_t *p = pmd; | |
ae8f1541 | 532 | |
24e6c699 RK |
533 | if (addr & SECTION_SIZE) |
534 | pmd++; | |
535 | ||
536 | do { | |
537 | *pmd = __pmd(phys | type->prot_sect); | |
538 | phys += SECTION_SIZE; | |
539 | } while (pmd++, addr += SECTION_SIZE, addr != end); | |
ae8f1541 | 540 | |
24e6c699 RK |
541 | flush_pmd_entry(p); |
542 | } else { | |
543 | /* | |
544 | * No need to loop; pte's aren't interested in the | |
545 | * individual L1 entries. | |
546 | */ | |
547 | alloc_init_pte(pmd, addr, end, __phys_to_pfn(phys), type); | |
548 | } | |
ae8f1541 RK |
549 | } |
550 | ||
4a56c1e4 RK |
551 | static void __init create_36bit_mapping(struct map_desc *md, |
552 | const struct mem_type *type) | |
553 | { | |
554 | unsigned long phys, addr, length, end; | |
555 | pgd_t *pgd; | |
556 | ||
557 | addr = md->virtual; | |
558 | phys = (unsigned long)__pfn_to_phys(md->pfn); | |
559 | length = PAGE_ALIGN(md->length); | |
560 | ||
561 | if (!(cpu_architecture() >= CPU_ARCH_ARMv6 || cpu_is_xsc3())) { | |
562 | printk(KERN_ERR "MM: CPU does not support supersection " | |
563 | "mapping for 0x%08llx at 0x%08lx\n", | |
564 | __pfn_to_phys((u64)md->pfn), addr); | |
565 | return; | |
566 | } | |
567 | ||
568 | /* N.B. ARMv6 supersections are only defined to work with domain 0. | |
569 | * Since domain assignments can in fact be arbitrary, the | |
570 | * 'domain == 0' check below is required to insure that ARMv6 | |
571 | * supersections are only allocated for domain 0 regardless | |
572 | * of the actual domain assignments in use. | |
573 | */ | |
574 | if (type->domain) { | |
575 | printk(KERN_ERR "MM: invalid domain in supersection " | |
576 | "mapping for 0x%08llx at 0x%08lx\n", | |
577 | __pfn_to_phys((u64)md->pfn), addr); | |
578 | return; | |
579 | } | |
580 | ||
581 | if ((addr | length | __pfn_to_phys(md->pfn)) & ~SUPERSECTION_MASK) { | |
582 | printk(KERN_ERR "MM: cannot create mapping for " | |
583 | "0x%08llx at 0x%08lx invalid alignment\n", | |
584 | __pfn_to_phys((u64)md->pfn), addr); | |
585 | return; | |
586 | } | |
587 | ||
588 | /* | |
589 | * Shift bits [35:32] of address into bits [23:20] of PMD | |
590 | * (See ARMv6 spec). | |
591 | */ | |
592 | phys |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20); | |
593 | ||
594 | pgd = pgd_offset_k(addr); | |
595 | end = addr + length; | |
596 | do { | |
597 | pmd_t *pmd = pmd_offset(pgd, addr); | |
598 | int i; | |
599 | ||
600 | for (i = 0; i < 16; i++) | |
601 | *pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER); | |
602 | ||
603 | addr += SUPERSECTION_SIZE; | |
604 | phys += SUPERSECTION_SIZE; | |
605 | pgd += SUPERSECTION_SIZE >> PGDIR_SHIFT; | |
606 | } while (addr != end); | |
607 | } | |
608 | ||
ae8f1541 RK |
609 | /* |
610 | * Create the page directory entries and any necessary | |
611 | * page tables for the mapping specified by `md'. We | |
612 | * are able to cope here with varying sizes and address | |
613 | * offsets, and we take full advantage of sections and | |
614 | * supersections. | |
615 | */ | |
a2227120 | 616 | static void __init create_mapping(struct map_desc *md) |
ae8f1541 | 617 | { |
24e6c699 | 618 | unsigned long phys, addr, length, end; |
d5c98176 | 619 | const struct mem_type *type; |
24e6c699 | 620 | pgd_t *pgd; |
ae8f1541 RK |
621 | |
622 | if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) { | |
623 | printk(KERN_WARNING "BUG: not creating mapping for " | |
624 | "0x%08llx at 0x%08lx in user region\n", | |
625 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
626 | return; | |
627 | } | |
628 | ||
629 | if ((md->type == MT_DEVICE || md->type == MT_ROM) && | |
630 | md->virtual >= PAGE_OFFSET && md->virtual < VMALLOC_END) { | |
631 | printk(KERN_WARNING "BUG: mapping for 0x%08llx at 0x%08lx " | |
632 | "overlaps vmalloc space\n", | |
633 | __pfn_to_phys((u64)md->pfn), md->virtual); | |
634 | } | |
635 | ||
d5c98176 | 636 | type = &mem_types[md->type]; |
ae8f1541 RK |
637 | |
638 | /* | |
639 | * Catch 36-bit addresses | |
640 | */ | |
4a56c1e4 RK |
641 | if (md->pfn >= 0x100000) { |
642 | create_36bit_mapping(md, type); | |
643 | return; | |
ae8f1541 RK |
644 | } |
645 | ||
7b9c7b4d | 646 | addr = md->virtual & PAGE_MASK; |
24e6c699 | 647 | phys = (unsigned long)__pfn_to_phys(md->pfn); |
7b9c7b4d | 648 | length = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK)); |
ae8f1541 | 649 | |
24e6c699 | 650 | if (type->prot_l1 == 0 && ((addr | phys | length) & ~SECTION_MASK)) { |
ae8f1541 RK |
651 | printk(KERN_WARNING "BUG: map for 0x%08lx at 0x%08lx can not " |
652 | "be mapped using pages, ignoring.\n", | |
24e6c699 | 653 | __pfn_to_phys(md->pfn), addr); |
ae8f1541 RK |
654 | return; |
655 | } | |
656 | ||
24e6c699 RK |
657 | pgd = pgd_offset_k(addr); |
658 | end = addr + length; | |
659 | do { | |
660 | unsigned long next = pgd_addr_end(addr, end); | |
ae8f1541 | 661 | |
24e6c699 | 662 | alloc_init_section(pgd, addr, next, phys, type); |
ae8f1541 | 663 | |
24e6c699 RK |
664 | phys += next - addr; |
665 | addr = next; | |
666 | } while (pgd++, addr != end); | |
ae8f1541 RK |
667 | } |
668 | ||
669 | /* | |
670 | * Create the architecture specific mappings | |
671 | */ | |
672 | void __init iotable_init(struct map_desc *io_desc, int nr) | |
673 | { | |
674 | int i; | |
675 | ||
676 | for (i = 0; i < nr; i++) | |
677 | create_mapping(io_desc + i); | |
678 | } | |
679 | ||
79612395 | 680 | static void * __initdata vmalloc_min = (void *)(VMALLOC_END - SZ_128M); |
6c5da7ac RK |
681 | |
682 | /* | |
683 | * vmalloc=size forces the vmalloc area to be exactly 'size' | |
684 | * bytes. This can be used to increase (or decrease) the vmalloc | |
685 | * area - the default is 128m. | |
686 | */ | |
2b0d8c25 | 687 | static int __init early_vmalloc(char *arg) |
6c5da7ac | 688 | { |
79612395 | 689 | unsigned long vmalloc_reserve = memparse(arg, NULL); |
6c5da7ac RK |
690 | |
691 | if (vmalloc_reserve < SZ_16M) { | |
692 | vmalloc_reserve = SZ_16M; | |
693 | printk(KERN_WARNING | |
694 | "vmalloc area too small, limiting to %luMB\n", | |
695 | vmalloc_reserve >> 20); | |
696 | } | |
9210807c NP |
697 | |
698 | if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) { | |
699 | vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M); | |
700 | printk(KERN_WARNING | |
701 | "vmalloc area is too big, limiting to %luMB\n", | |
702 | vmalloc_reserve >> 20); | |
703 | } | |
79612395 RK |
704 | |
705 | vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve); | |
2b0d8c25 | 706 | return 0; |
6c5da7ac | 707 | } |
2b0d8c25 | 708 | early_param("vmalloc", early_vmalloc); |
6c5da7ac | 709 | |
2778f620 RK |
710 | phys_addr_t lowmem_end_addr; |
711 | ||
4b5f32ce | 712 | static void __init sanity_check_meminfo(void) |
60296c71 | 713 | { |
dde5828f | 714 | int i, j, highmem = 0; |
60296c71 | 715 | |
2778f620 RK |
716 | lowmem_end_addr = __pa(vmalloc_min - 1) + 1; |
717 | ||
4b5f32ce | 718 | for (i = 0, j = 0; i < meminfo.nr_banks; i++) { |
a1bbaec0 NP |
719 | struct membank *bank = &meminfo.bank[j]; |
720 | *bank = meminfo.bank[i]; | |
60296c71 | 721 | |
a1bbaec0 | 722 | #ifdef CONFIG_HIGHMEM |
79612395 | 723 | if (__va(bank->start) > vmalloc_min || |
dde5828f RK |
724 | __va(bank->start) < (void *)PAGE_OFFSET) |
725 | highmem = 1; | |
726 | ||
727 | bank->highmem = highmem; | |
728 | ||
a1bbaec0 NP |
729 | /* |
730 | * Split those memory banks which are partially overlapping | |
731 | * the vmalloc area greatly simplifying things later. | |
732 | */ | |
79612395 RK |
733 | if (__va(bank->start) < vmalloc_min && |
734 | bank->size > vmalloc_min - __va(bank->start)) { | |
a1bbaec0 NP |
735 | if (meminfo.nr_banks >= NR_BANKS) { |
736 | printk(KERN_CRIT "NR_BANKS too low, " | |
737 | "ignoring high memory\n"); | |
738 | } else { | |
739 | memmove(bank + 1, bank, | |
740 | (meminfo.nr_banks - i) * sizeof(*bank)); | |
741 | meminfo.nr_banks++; | |
742 | i++; | |
79612395 RK |
743 | bank[1].size -= vmalloc_min - __va(bank->start); |
744 | bank[1].start = __pa(vmalloc_min - 1) + 1; | |
dde5828f | 745 | bank[1].highmem = highmem = 1; |
a1bbaec0 NP |
746 | j++; |
747 | } | |
79612395 | 748 | bank->size = vmalloc_min - __va(bank->start); |
a1bbaec0 NP |
749 | } |
750 | #else | |
041d785f RK |
751 | bank->highmem = highmem; |
752 | ||
a1bbaec0 NP |
753 | /* |
754 | * Check whether this memory bank would entirely overlap | |
755 | * the vmalloc area. | |
756 | */ | |
79612395 | 757 | if (__va(bank->start) >= vmalloc_min || |
f0bba9f9 | 758 | __va(bank->start) < (void *)PAGE_OFFSET) { |
a1bbaec0 NP |
759 | printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx " |
760 | "(vmalloc region overlap).\n", | |
761 | bank->start, bank->start + bank->size - 1); | |
762 | continue; | |
763 | } | |
60296c71 | 764 | |
a1bbaec0 NP |
765 | /* |
766 | * Check whether this memory bank would partially overlap | |
767 | * the vmalloc area. | |
768 | */ | |
79612395 | 769 | if (__va(bank->start + bank->size) > vmalloc_min || |
a1bbaec0 | 770 | __va(bank->start + bank->size) < __va(bank->start)) { |
79612395 | 771 | unsigned long newsize = vmalloc_min - __va(bank->start); |
a1bbaec0 NP |
772 | printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx " |
773 | "to -%.8lx (vmalloc region overlap).\n", | |
774 | bank->start, bank->start + bank->size - 1, | |
775 | bank->start + newsize - 1); | |
776 | bank->size = newsize; | |
777 | } | |
778 | #endif | |
779 | j++; | |
60296c71 | 780 | } |
e616c591 RK |
781 | #ifdef CONFIG_HIGHMEM |
782 | if (highmem) { | |
783 | const char *reason = NULL; | |
784 | ||
785 | if (cache_is_vipt_aliasing()) { | |
786 | /* | |
787 | * Interactions between kmap and other mappings | |
788 | * make highmem support with aliasing VIPT caches | |
789 | * rather difficult. | |
790 | */ | |
791 | reason = "with VIPT aliasing cache"; | |
792 | #ifdef CONFIG_SMP | |
793 | } else if (tlb_ops_need_broadcast()) { | |
794 | /* | |
795 | * kmap_high needs to occasionally flush TLB entries, | |
796 | * however, if the TLB entries need to be broadcast | |
797 | * we may deadlock: | |
798 | * kmap_high(irqs off)->flush_all_zero_pkmaps-> | |
799 | * flush_tlb_kernel_range->smp_call_function_many | |
800 | * (must not be called with irqs off) | |
801 | */ | |
802 | reason = "without hardware TLB ops broadcasting"; | |
803 | #endif | |
804 | } | |
805 | if (reason) { | |
806 | printk(KERN_CRIT "HIGHMEM is not supported %s, ignoring high memory\n", | |
807 | reason); | |
808 | while (j > 0 && meminfo.bank[j - 1].highmem) | |
809 | j--; | |
810 | } | |
811 | } | |
812 | #endif | |
4b5f32ce | 813 | meminfo.nr_banks = j; |
60296c71 LB |
814 | } |
815 | ||
4b5f32ce | 816 | static inline void prepare_page_table(void) |
d111e8f9 RK |
817 | { |
818 | unsigned long addr; | |
819 | ||
820 | /* | |
821 | * Clear out all the mappings below the kernel image. | |
822 | */ | |
ab4f2ee1 | 823 | for (addr = 0; addr < MODULES_VADDR; addr += PGDIR_SIZE) |
d111e8f9 RK |
824 | pmd_clear(pmd_off_k(addr)); |
825 | ||
826 | #ifdef CONFIG_XIP_KERNEL | |
827 | /* The XIP kernel is mapped in the module area -- skip over it */ | |
37efe642 | 828 | addr = ((unsigned long)_etext + PGDIR_SIZE - 1) & PGDIR_MASK; |
d111e8f9 RK |
829 | #endif |
830 | for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE) | |
831 | pmd_clear(pmd_off_k(addr)); | |
832 | ||
833 | /* | |
834 | * Clear out all the kernel space mappings, except for the first | |
835 | * memory bank, up to the end of the vmalloc region. | |
836 | */ | |
4b5f32ce | 837 | for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0])); |
d111e8f9 RK |
838 | addr < VMALLOC_END; addr += PGDIR_SIZE) |
839 | pmd_clear(pmd_off_k(addr)); | |
840 | } | |
841 | ||
842 | /* | |
2778f620 | 843 | * Reserve the special regions of memory |
d111e8f9 | 844 | */ |
2778f620 | 845 | void __init arm_mm_memblock_reserve(void) |
d111e8f9 | 846 | { |
d111e8f9 RK |
847 | /* |
848 | * Reserve the page tables. These are already in use, | |
849 | * and can only be in node 0. | |
850 | */ | |
2778f620 | 851 | memblock_reserve(__pa(swapper_pg_dir), PTRS_PER_PGD * sizeof(pgd_t)); |
d111e8f9 | 852 | |
d111e8f9 RK |
853 | #ifdef CONFIG_SA1111 |
854 | /* | |
855 | * Because of the SA1111 DMA bug, we want to preserve our | |
856 | * precious DMA-able memory... | |
857 | */ | |
2778f620 | 858 | memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET); |
d111e8f9 | 859 | #endif |
d111e8f9 RK |
860 | } |
861 | ||
862 | /* | |
863 | * Set up device the mappings. Since we clear out the page tables for all | |
864 | * mappings above VMALLOC_END, we will remove any debug device mappings. | |
865 | * This means you have to be careful how you debug this function, or any | |
866 | * called function. This means you can't use any function or debugging | |
867 | * method which may touch any device, otherwise the kernel _will_ crash. | |
868 | */ | |
869 | static void __init devicemaps_init(struct machine_desc *mdesc) | |
870 | { | |
871 | struct map_desc map; | |
872 | unsigned long addr; | |
873 | void *vectors; | |
874 | ||
875 | /* | |
876 | * Allocate the vector page early. | |
877 | */ | |
3abe9d33 | 878 | vectors = early_alloc(PAGE_SIZE); |
d111e8f9 RK |
879 | |
880 | for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE) | |
881 | pmd_clear(pmd_off_k(addr)); | |
882 | ||
883 | /* | |
884 | * Map the kernel if it is XIP. | |
885 | * It is always first in the modulearea. | |
886 | */ | |
887 | #ifdef CONFIG_XIP_KERNEL | |
888 | map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK); | |
ab4f2ee1 | 889 | map.virtual = MODULES_VADDR; |
37efe642 | 890 | map.length = ((unsigned long)_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK; |
d111e8f9 RK |
891 | map.type = MT_ROM; |
892 | create_mapping(&map); | |
893 | #endif | |
894 | ||
895 | /* | |
896 | * Map the cache flushing regions. | |
897 | */ | |
898 | #ifdef FLUSH_BASE | |
899 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS); | |
900 | map.virtual = FLUSH_BASE; | |
901 | map.length = SZ_1M; | |
902 | map.type = MT_CACHECLEAN; | |
903 | create_mapping(&map); | |
904 | #endif | |
905 | #ifdef FLUSH_BASE_MINICACHE | |
906 | map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M); | |
907 | map.virtual = FLUSH_BASE_MINICACHE; | |
908 | map.length = SZ_1M; | |
909 | map.type = MT_MINICLEAN; | |
910 | create_mapping(&map); | |
911 | #endif | |
912 | ||
913 | /* | |
914 | * Create a mapping for the machine vectors at the high-vectors | |
915 | * location (0xffff0000). If we aren't using high-vectors, also | |
916 | * create a mapping at the low-vectors virtual address. | |
917 | */ | |
918 | map.pfn = __phys_to_pfn(virt_to_phys(vectors)); | |
919 | map.virtual = 0xffff0000; | |
920 | map.length = PAGE_SIZE; | |
921 | map.type = MT_HIGH_VECTORS; | |
922 | create_mapping(&map); | |
923 | ||
924 | if (!vectors_high()) { | |
925 | map.virtual = 0; | |
926 | map.type = MT_LOW_VECTORS; | |
927 | create_mapping(&map); | |
928 | } | |
929 | ||
930 | /* | |
931 | * Ask the machine support to map in the statically mapped devices. | |
932 | */ | |
933 | if (mdesc->map_io) | |
934 | mdesc->map_io(); | |
935 | ||
936 | /* | |
937 | * Finally flush the caches and tlb to ensure that we're in a | |
938 | * consistent state wrt the writebuffer. This also ensures that | |
939 | * any write-allocated cache lines in the vector page are written | |
940 | * back. After this point, we can start to touch devices again. | |
941 | */ | |
942 | local_flush_tlb_all(); | |
943 | flush_cache_all(); | |
944 | } | |
945 | ||
d73cd428 NP |
946 | static void __init kmap_init(void) |
947 | { | |
948 | #ifdef CONFIG_HIGHMEM | |
4bb2e27d RK |
949 | pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE), |
950 | PKMAP_BASE, _PAGE_KERNEL_TABLE); | |
d73cd428 NP |
951 | #endif |
952 | } | |
953 | ||
a2227120 RK |
954 | static inline void map_memory_bank(struct membank *bank) |
955 | { | |
956 | struct map_desc map; | |
957 | ||
958 | map.pfn = bank_pfn_start(bank); | |
959 | map.virtual = __phys_to_virt(bank_phys_start(bank)); | |
960 | map.length = bank_phys_size(bank); | |
961 | map.type = MT_MEMORY; | |
962 | ||
963 | create_mapping(&map); | |
964 | } | |
965 | ||
966 | static void __init map_lowmem(void) | |
967 | { | |
968 | struct meminfo *mi = &meminfo; | |
969 | int i; | |
970 | ||
971 | /* Map all the lowmem memory banks. */ | |
972 | for (i = 0; i < mi->nr_banks; i++) { | |
973 | struct membank *bank = &mi->bank[i]; | |
974 | ||
975 | if (!bank->highmem) | |
976 | map_memory_bank(bank); | |
977 | } | |
978 | } | |
979 | ||
ceb683d3 RK |
980 | static int __init meminfo_cmp(const void *_a, const void *_b) |
981 | { | |
982 | const struct membank *a = _a, *b = _b; | |
983 | long cmp = bank_pfn_start(a) - bank_pfn_start(b); | |
984 | return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; | |
985 | } | |
986 | ||
d111e8f9 RK |
987 | /* |
988 | * paging_init() sets up the page tables, initialises the zone memory | |
989 | * maps, and sets up the zero page, bad page and bad page tables. | |
990 | */ | |
4b5f32ce | 991 | void __init paging_init(struct machine_desc *mdesc) |
d111e8f9 RK |
992 | { |
993 | void *zero_page; | |
994 | ||
ceb683d3 RK |
995 | sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); |
996 | ||
d111e8f9 | 997 | build_mem_type_table(); |
4b5f32ce NP |
998 | sanity_check_meminfo(); |
999 | prepare_page_table(); | |
a2227120 | 1000 | map_lowmem(); |
d111e8f9 | 1001 | devicemaps_init(mdesc); |
d73cd428 | 1002 | kmap_init(); |
d111e8f9 RK |
1003 | |
1004 | top_pmd = pmd_off_k(0xffff0000); | |
1005 | ||
3abe9d33 RK |
1006 | /* allocate the zero page. */ |
1007 | zero_page = early_alloc(PAGE_SIZE); | |
2778f620 RK |
1008 | |
1009 | bootmem_init(mdesc); | |
1010 | ||
d111e8f9 | 1011 | empty_zero_page = virt_to_page(zero_page); |
421fe93c | 1012 | __flush_dcache_page(NULL, empty_zero_page); |
d111e8f9 | 1013 | } |
ae8f1541 RK |
1014 | |
1015 | /* | |
1016 | * In order to soft-boot, we need to insert a 1:1 mapping in place of | |
1017 | * the user-mode pages. This will then ensure that we have predictable | |
1018 | * results when turning the mmu off | |
1019 | */ | |
1020 | void setup_mm_for_reboot(char mode) | |
1021 | { | |
1022 | unsigned long base_pmdval; | |
1023 | pgd_t *pgd; | |
1024 | int i; | |
1025 | ||
3f2d4f56 MW |
1026 | /* |
1027 | * We need to access to user-mode page tables here. For kernel threads | |
1028 | * we don't have any user-mode mappings so we use the context that we | |
1029 | * "borrowed". | |
1030 | */ | |
1031 | pgd = current->active_mm->pgd; | |
ae8f1541 RK |
1032 | |
1033 | base_pmdval = PMD_SECT_AP_WRITE | PMD_SECT_AP_READ | PMD_TYPE_SECT; | |
1034 | if (cpu_architecture() <= CPU_ARCH_ARMv5TEJ && !cpu_is_xscale()) | |
1035 | base_pmdval |= PMD_BIT4; | |
1036 | ||
1037 | for (i = 0; i < FIRST_USER_PGD_NR + USER_PTRS_PER_PGD; i++, pgd++) { | |
1038 | unsigned long pmdval = (i << PGDIR_SHIFT) | base_pmdval; | |
1039 | pmd_t *pmd; | |
1040 | ||
1041 | pmd = pmd_off(pgd, i << PGDIR_SHIFT); | |
1042 | pmd[0] = __pmd(pmdval); | |
1043 | pmd[1] = __pmd(pmdval + (1 << (PGDIR_SHIFT - 1))); | |
1044 | flush_pmd_entry(pmd); | |
1045 | } | |
ad3e6c0b TL |
1046 | |
1047 | local_flush_tlb_all(); | |
ae8f1541 | 1048 | } |