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7#include <linux/kernel.h>
8#include <linux/errno.h>
9#include <linux/swap.h>
10#include <linux/init.h>
11#include <linux/mman.h>
12#include <linux/sched/signal.h>
13#include <linux/sched/task.h>
14#include <linux/export.h>
15#include <linux/nodemask.h>
16#include <linux/initrd.h>
17#include <linux/of_fdt.h>
18#include <linux/highmem.h>
19#include <linux/gfp.h>
20#include <linux/memblock.h>
21#include <linux/dma-map-ops.h>
22#include <linux/sizes.h>
23#include <linux/stop_machine.h>
24#include <linux/swiotlb.h>
25
26#include <asm/cp15.h>
27#include <asm/mach-types.h>
28#include <asm/memblock.h>
29#include <asm/memory.h>
30#include <asm/prom.h>
31#include <asm/sections.h>
32#include <asm/setup.h>
33#include <asm/set_memory.h>
34#include <asm/system_info.h>
35#include <asm/tlb.h>
36#include <asm/fixmap.h>
37#include <asm/ptdump.h>
38
39#include <asm/mach/arch.h>
40#include <asm/mach/map.h>
41
42#include "mm.h"
43
44#ifdef CONFIG_CPU_CP15_MMU
45unsigned long __init __clear_cr(unsigned long mask)
46{
47 cr_alignment = cr_alignment & ~mask;
48 return cr_alignment;
49}
50#endif
51
52#ifdef CONFIG_BLK_DEV_INITRD
53static int __init parse_tag_initrd(const struct tag *tag)
54{
55 pr_warn("ATAG_INITRD is deprecated; "
56 "please update your bootloader.\n");
57 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
58 phys_initrd_size = tag->u.initrd.size;
59 return 0;
60}
61
62__tagtable(ATAG_INITRD, parse_tag_initrd);
63
64static int __init parse_tag_initrd2(const struct tag *tag)
65{
66 phys_initrd_start = tag->u.initrd.start;
67 phys_initrd_size = tag->u.initrd.size;
68 return 0;
69}
70
71__tagtable(ATAG_INITRD2, parse_tag_initrd2);
72#endif
73
74static void __init find_limits(unsigned long *min, unsigned long *max_low,
75 unsigned long *max_high)
76{
77 *max_low = PFN_DOWN(memblock_get_current_limit());
78 *min = PFN_UP(memblock_start_of_DRAM());
79 *max_high = PFN_DOWN(memblock_end_of_DRAM());
80}
81
82#ifdef CONFIG_ZONE_DMA
83
84phys_addr_t arm_dma_zone_size __read_mostly;
85EXPORT_SYMBOL(arm_dma_zone_size);
86
87
88
89
90
91
92
93phys_addr_t arm_dma_limit;
94unsigned long arm_dma_pfn_limit;
95#endif
96
97void __init setup_dma_zone(const struct machine_desc *mdesc)
98{
99#ifdef CONFIG_ZONE_DMA
100 if (mdesc->dma_zone_size) {
101 arm_dma_zone_size = mdesc->dma_zone_size;
102 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
103 } else
104 arm_dma_limit = 0xffffffff;
105 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
106#endif
107}
108
109static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
110 unsigned long max_high)
111{
112 unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
113
114#ifdef CONFIG_ZONE_DMA
115 max_zone_pfn[ZONE_DMA] = min(arm_dma_pfn_limit, max_low);
116#endif
117 max_zone_pfn[ZONE_NORMAL] = max_low;
118#ifdef CONFIG_HIGHMEM
119 max_zone_pfn[ZONE_HIGHMEM] = max_high;
120#endif
121 free_area_init(max_zone_pfn);
122}
123
124#ifdef CONFIG_HAVE_ARCH_PFN_VALID
125int pfn_valid(unsigned long pfn)
126{
127 phys_addr_t addr = __pfn_to_phys(pfn);
128
129 if (__phys_to_pfn(addr) != pfn)
130 return 0;
131
132 return memblock_is_map_memory(addr);
133}
134EXPORT_SYMBOL(pfn_valid);
135#endif
136
137static bool arm_memblock_steal_permitted = true;
138
139phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
140{
141 phys_addr_t phys;
142
143 BUG_ON(!arm_memblock_steal_permitted);
144
145 phys = memblock_phys_alloc(size, align);
146 if (!phys)
147 panic("Failed to steal %pa bytes at %pS\n",
148 &size, (void *)_RET_IP_);
149
150 memblock_free(phys, size);
151 memblock_remove(phys, size);
152
153 return phys;
154}
155
156static void __init arm_initrd_init(void)
157{
158#ifdef CONFIG_BLK_DEV_INITRD
159 phys_addr_t start;
160 unsigned long size;
161
162 initrd_start = initrd_end = 0;
163
164 if (!phys_initrd_size)
165 return;
166
167
168
169
170
171
172
173 start = round_down(phys_initrd_start, PAGE_SIZE);
174 size = phys_initrd_size + (phys_initrd_start - start);
175 size = round_up(size, PAGE_SIZE);
176
177 if (!memblock_is_region_memory(start, size)) {
178 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
179 (u64)start, size);
180 return;
181 }
182
183 if (memblock_is_region_reserved(start, size)) {
184 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
185 (u64)start, size);
186 return;
187 }
188
189 memblock_reserve(start, size);
190
191
192 initrd_start = __phys_to_virt(phys_initrd_start);
193 initrd_end = initrd_start + phys_initrd_size;
194#endif
195}
196
197#ifdef CONFIG_CPU_ICACHE_MISMATCH_WORKAROUND
198void check_cpu_icache_size(int cpuid)
199{
200 u32 size, ctr;
201
202 asm("mrc p15, 0, %0, c0, c0, 1" : "=r" (ctr));
203
204 size = 1 << ((ctr & 0xf) + 2);
205 if (cpuid != 0 && icache_size != size)
206 pr_info("CPU%u: detected I-Cache line size mismatch, workaround enabled\n",
207 cpuid);
208 if (icache_size > size)
209 icache_size = size;
210}
211#endif
212
213void __init arm_memblock_init(const struct machine_desc *mdesc)
214{
215
216 memblock_reserve(__pa(KERNEL_START), KERNEL_END - KERNEL_START);
217
218 arm_initrd_init();
219
220 arm_mm_memblock_reserve();
221
222
223 if (mdesc->reserve)
224 mdesc->reserve();
225
226 early_init_fdt_reserve_self();
227 early_init_fdt_scan_reserved_mem();
228
229
230 dma_contiguous_reserve(arm_dma_limit);
231
232 arm_memblock_steal_permitted = false;
233 memblock_dump_all();
234}
235
236void __init bootmem_init(void)
237{
238 memblock_allow_resize();
239
240 find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
241
242 early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT,
243 (phys_addr_t)max_low_pfn << PAGE_SHIFT);
244
245
246
247
248
249 sparse_init();
250
251
252
253
254
255
256 zone_sizes_init(min_low_pfn, max_low_pfn, max_pfn);
257}
258
259
260
261
262
263static inline void poison_init_mem(void *s, size_t count)
264{
265 u32 *p = (u32 *)s;
266 for (; count != 0; count -= 4)
267 *p++ = 0xe7fddef0;
268}
269
270static inline void __init
271free_memmap(unsigned long start_pfn, unsigned long end_pfn)
272{
273 struct page *start_pg, *end_pg;
274 phys_addr_t pg, pgend;
275
276
277
278
279 start_pg = pfn_to_page(start_pfn - 1) + 1;
280 end_pg = pfn_to_page(end_pfn - 1) + 1;
281
282
283
284
285
286 pg = PAGE_ALIGN(__pa(start_pg));
287 pgend = __pa(end_pg) & PAGE_MASK;
288
289
290
291
292
293 if (pg < pgend)
294 memblock_free_early(pg, pgend - pg);
295}
296
297
298
299
300static void __init free_unused_memmap(void)
301{
302 unsigned long start, end, prev_end = 0;
303 int i;
304
305
306
307
308
309 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
310#ifdef CONFIG_SPARSEMEM
311
312
313
314
315 start = min(start,
316 ALIGN(prev_end, PAGES_PER_SECTION));
317#else
318
319
320
321
322
323 start = round_down(start, MAX_ORDER_NR_PAGES);
324#endif
325
326
327
328
329 if (prev_end && prev_end < start)
330 free_memmap(prev_end, start);
331
332
333
334
335
336
337 prev_end = ALIGN(end, MAX_ORDER_NR_PAGES);
338 }
339
340#ifdef CONFIG_SPARSEMEM
341 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
342 free_memmap(prev_end,
343 ALIGN(prev_end, PAGES_PER_SECTION));
344#endif
345}
346
347static void __init free_highpages(void)
348{
349#ifdef CONFIG_HIGHMEM
350 unsigned long max_low = max_low_pfn;
351 phys_addr_t range_start, range_end;
352 u64 i;
353
354
355 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
356 &range_start, &range_end, NULL) {
357 unsigned long start = PFN_UP(range_start);
358 unsigned long end = PFN_DOWN(range_end);
359
360
361 if (end <= max_low)
362 continue;
363
364
365 if (start < max_low)
366 start = max_low;
367
368 for (; start < end; start++)
369 free_highmem_page(pfn_to_page(start));
370 }
371#endif
372}
373
374
375
376
377
378
379void __init mem_init(void)
380{
381#ifdef CONFIG_ARM_LPAE
382 swiotlb_init(1);
383#endif
384
385 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
386
387
388 free_unused_memmap();
389 memblock_free_all();
390
391#ifdef CONFIG_SA1111
392
393 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
394#endif
395
396 free_highpages();
397
398 mem_init_print_info(NULL);
399
400
401
402
403
404#ifdef CONFIG_MMU
405 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
406 BUG_ON(TASK_SIZE > MODULES_VADDR);
407#endif
408
409#ifdef CONFIG_HIGHMEM
410 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
411 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
412#endif
413}
414
415#ifdef CONFIG_STRICT_KERNEL_RWX
416struct section_perm {
417 const char *name;
418 unsigned long start;
419 unsigned long end;
420 pmdval_t mask;
421 pmdval_t prot;
422 pmdval_t clear;
423};
424
425
426extern char __start_rodata_section_aligned[];
427
428static struct section_perm nx_perms[] = {
429
430 {
431 .name = "pre-text NX",
432 .start = PAGE_OFFSET,
433 .end = (unsigned long)_stext,
434 .mask = ~PMD_SECT_XN,
435 .prot = PMD_SECT_XN,
436 },
437
438 {
439 .name = "init NX",
440 .start = (unsigned long)__init_begin,
441 .end = (unsigned long)_sdata,
442 .mask = ~PMD_SECT_XN,
443 .prot = PMD_SECT_XN,
444 },
445
446 {
447 .name = "rodata NX",
448 .start = (unsigned long)__start_rodata_section_aligned,
449 .end = (unsigned long)__init_begin,
450 .mask = ~PMD_SECT_XN,
451 .prot = PMD_SECT_XN,
452 },
453};
454
455static struct section_perm ro_perms[] = {
456
457 {
458 .name = "text/rodata RO",
459 .start = (unsigned long)_stext,
460 .end = (unsigned long)__init_begin,
461#ifdef CONFIG_ARM_LPAE
462 .mask = ~(L_PMD_SECT_RDONLY | PMD_SECT_AP2),
463 .prot = L_PMD_SECT_RDONLY | PMD_SECT_AP2,
464#else
465 .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE),
466 .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE,
467 .clear = PMD_SECT_AP_WRITE,
468#endif
469 },
470};
471
472
473
474
475
476
477static inline void section_update(unsigned long addr, pmdval_t mask,
478 pmdval_t prot, struct mm_struct *mm)
479{
480 pmd_t *pmd;
481
482 pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, addr), addr), addr), addr);
483
484#ifdef CONFIG_ARM_LPAE
485 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
486#else
487 if (addr & SECTION_SIZE)
488 pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot);
489 else
490 pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot);
491#endif
492 flush_pmd_entry(pmd);
493 local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE);
494}
495
496
497static inline bool arch_has_strict_perms(void)
498{
499 if (cpu_architecture() < CPU_ARCH_ARMv6)
500 return false;
501
502 return !!(get_cr() & CR_XP);
503}
504
505static void set_section_perms(struct section_perm *perms, int n, bool set,
506 struct mm_struct *mm)
507{
508 size_t i;
509 unsigned long addr;
510
511 if (!arch_has_strict_perms())
512 return;
513
514 for (i = 0; i < n; i++) {
515 if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) ||
516 !IS_ALIGNED(perms[i].end, SECTION_SIZE)) {
517 pr_err("BUG: %s section %lx-%lx not aligned to %lx\n",
518 perms[i].name, perms[i].start, perms[i].end,
519 SECTION_SIZE);
520 continue;
521 }
522
523 for (addr = perms[i].start;
524 addr < perms[i].end;
525 addr += SECTION_SIZE)
526 section_update(addr, perms[i].mask,
527 set ? perms[i].prot : perms[i].clear, mm);
528 }
529
530}
531
532
533
534
535
536
537static void update_sections_early(struct section_perm perms[], int n)
538{
539 struct task_struct *t, *s;
540
541 for_each_process(t) {
542 if (t->flags & PF_KTHREAD)
543 continue;
544 for_each_thread(t, s)
545 if (s->mm)
546 set_section_perms(perms, n, true, s->mm);
547 }
548 set_section_perms(perms, n, true, current->active_mm);
549 set_section_perms(perms, n, true, &init_mm);
550}
551
552static int __fix_kernmem_perms(void *unused)
553{
554 update_sections_early(nx_perms, ARRAY_SIZE(nx_perms));
555 return 0;
556}
557
558static void fix_kernmem_perms(void)
559{
560 stop_machine(__fix_kernmem_perms, NULL, NULL);
561}
562
563static int __mark_rodata_ro(void *unused)
564{
565 update_sections_early(ro_perms, ARRAY_SIZE(ro_perms));
566 return 0;
567}
568
569static int kernel_set_to_readonly __read_mostly;
570
571void mark_rodata_ro(void)
572{
573 kernel_set_to_readonly = 1;
574 stop_machine(__mark_rodata_ro, NULL, NULL);
575 debug_checkwx();
576}
577
578void set_kernel_text_rw(void)
579{
580 if (!kernel_set_to_readonly)
581 return;
582
583 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), false,
584 current->active_mm);
585}
586
587void set_kernel_text_ro(void)
588{
589 if (!kernel_set_to_readonly)
590 return;
591
592 set_section_perms(ro_perms, ARRAY_SIZE(ro_perms), true,
593 current->active_mm);
594}
595
596#else
597static inline void fix_kernmem_perms(void) { }
598#endif
599
600void free_initmem(void)
601{
602 fix_kernmem_perms();
603
604 poison_init_mem(__init_begin, __init_end - __init_begin);
605 if (!machine_is_integrator() && !machine_is_cintegrator())
606 free_initmem_default(-1);
607}
608
609#ifdef CONFIG_BLK_DEV_INITRD
610void free_initrd_mem(unsigned long start, unsigned long end)
611{
612 if (start == initrd_start)
613 start = round_down(start, PAGE_SIZE);
614 if (end == initrd_end)
615 end = round_up(end, PAGE_SIZE);
616
617 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
618 free_reserved_area((void *)start, (void *)end, -1, "initrd");
619}
620#endif
621