summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/tlbflush.h
blob: 1897b5196fb57fd9a1cc8962d3d65ad317ca6bcd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
/*
 *  arch/arm/include/asm/tlbflush.h
 *
 *  Copyright (C) 1999-2003 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _ASMARM_TLBFLUSH_H
#define _ASMARM_TLBFLUSH_H

#ifndef __ASSEMBLY__
# include <linux/mm_types.h>
#endif

#ifdef CONFIG_MMU

#include <asm/glue.h>

#define TLB_V4_U_PAGE	(1 << 1)
#define TLB_V4_D_PAGE	(1 << 2)
#define TLB_V4_I_PAGE	(1 << 3)
#define TLB_V6_U_PAGE	(1 << 4)
#define TLB_V6_D_PAGE	(1 << 5)
#define TLB_V6_I_PAGE	(1 << 6)

#define TLB_V4_U_FULL	(1 << 9)
#define TLB_V4_D_FULL	(1 << 10)
#define TLB_V4_I_FULL	(1 << 11)
#define TLB_V6_U_FULL	(1 << 12)
#define TLB_V6_D_FULL	(1 << 13)
#define TLB_V6_I_FULL	(1 << 14)

#define TLB_V6_U_ASID	(1 << 16)
#define TLB_V6_D_ASID	(1 << 17)
#define TLB_V6_I_ASID	(1 << 18)

#define TLB_V6_BP	(1 << 19)

/* Unified Inner Shareable TLB operations (ARMv7 MP extensions) */
#define TLB_V7_UIS_PAGE	(1 << 20)
#define TLB_V7_UIS_FULL (1 << 21)
#define TLB_V7_UIS_ASID (1 << 22)
#define TLB_V7_UIS_BP	(1 << 23)

#define TLB_BARRIER	(1 << 28)
#define TLB_L2CLEAN_FR	(1 << 29)		/* Feroceon */
#define TLB_DCLEAN	(1 << 30)
#define TLB_WB		(1 << 31)

/*
 *	MMU TLB Model
 *	=============
 *
 *	We have the following to choose from:
 *	  v4    - ARMv4 without write buffer
 *	  v4wb  - ARMv4 with write buffer without I TLB flush entry instruction
 *	  v4wbi - ARMv4 with write buffer with I TLB flush entry instruction
 *	  fr    - Feroceon (v4wbi with non-outer-cacheable page table walks)
 *	  fa    - Faraday (v4 with write buffer with UTLB)
 *	  v6wbi - ARMv6 with write buffer with I TLB flush entry instruction
 *	  v7wbi - identical to v6wbi
 */
#undef _TLB
#undef MULTI_TLB

#ifdef CONFIG_SMP_ON_UP
#define MULTI_TLB 1
#endif

#define v4_tlb_flags	(TLB_V4_U_FULL | TLB_V4_U_PAGE)

#ifdef CONFIG_CPU_TLB_V4WT
# define v4_possible_flags	v4_tlb_flags
# define v4_always_flags	v4_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4
# endif
#else
# define v4_possible_flags	0
# define v4_always_flags	(-1UL)
#endif

#define fa_tlb_flags	(TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
			 TLB_V4_U_FULL | TLB_V4_U_PAGE)

#ifdef CONFIG_CPU_TLB_FA
# define fa_possible_flags	fa_tlb_flags
# define fa_always_flags	fa_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB fa
# endif
#else
# define fa_possible_flags	0
# define fa_always_flags	(-1UL)
#endif

#define v4wbi_tlb_flags	(TLB_WB | TLB_DCLEAN | \
			 TLB_V4_I_FULL | TLB_V4_D_FULL | \
			 TLB_V4_I_PAGE | TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_V4WBI
# define v4wbi_possible_flags	v4wbi_tlb_flags
# define v4wbi_always_flags	v4wbi_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wbi
# endif
#else
# define v4wbi_possible_flags	0
# define v4wbi_always_flags	(-1UL)
#endif

#define fr_tlb_flags	(TLB_WB | TLB_DCLEAN | TLB_L2CLEAN_FR | \
			 TLB_V4_I_FULL | TLB_V4_D_FULL | \
			 TLB_V4_I_PAGE | TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_FEROCEON
# define fr_possible_flags	fr_tlb_flags
# define fr_always_flags	fr_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wbi
# endif
#else
# define fr_possible_flags	0
# define fr_always_flags	(-1UL)
#endif

#define v4wb_tlb_flags	(TLB_WB | TLB_DCLEAN | \
			 TLB_V4_I_FULL | TLB_V4_D_FULL | \
			 TLB_V4_D_PAGE)

#ifdef CONFIG_CPU_TLB_V4WB
# define v4wb_possible_flags	v4wb_tlb_flags
# define v4wb_always_flags	v4wb_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v4wb
# endif
#else
# define v4wb_possible_flags	0
# define v4wb_always_flags	(-1UL)
#endif

#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
			 TLB_V6_I_FULL | TLB_V6_D_FULL | \
			 TLB_V6_I_PAGE | TLB_V6_D_PAGE | \
			 TLB_V6_I_ASID | TLB_V6_D_ASID | \
			 TLB_V6_BP)

#ifdef CONFIG_CPU_TLB_V6
# define v6wbi_possible_flags	v6wbi_tlb_flags
# define v6wbi_always_flags	v6wbi_tlb_flags
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v6wbi
# endif
#else
# define v6wbi_possible_flags	0
# define v6wbi_always_flags	(-1UL)
#endif

#define v7wbi_tlb_flags_smp	(TLB_WB | TLB_BARRIER | \
				 TLB_V7_UIS_FULL | TLB_V7_UIS_PAGE | \
				 TLB_V7_UIS_ASID | TLB_V7_UIS_BP)
#define v7wbi_tlb_flags_up	(TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
				 TLB_V6_U_FULL | TLB_V6_U_PAGE | \
				 TLB_V6_U_ASID | TLB_V6_BP)

#ifdef CONFIG_CPU_TLB_V7

# ifdef CONFIG_SMP_ON_UP
#  define v7wbi_possible_flags	(v7wbi_tlb_flags_smp | v7wbi_tlb_flags_up)
#  define v7wbi_always_flags	(v7wbi_tlb_flags_smp & v7wbi_tlb_flags_up)
# elif defined(CONFIG_SMP)
#  define v7wbi_possible_flags	v7wbi_tlb_flags_smp
#  define v7wbi_always_flags	v7wbi_tlb_flags_smp
# else
#  define v7wbi_possible_flags	v7wbi_tlb_flags_up
#  define v7wbi_always_flags	v7wbi_tlb_flags_up
# endif
# ifdef _TLB
#  define MULTI_TLB 1
# else
#  define _TLB v7wbi
# endif
#else
# define v7wbi_possible_flags	0
# define v7wbi_always_flags	(-1UL)
#endif

#ifndef _TLB
#error Unknown TLB model
#endif

#ifndef __ASSEMBLY__

#include <linux/sched.h>

struct cpu_tlb_fns {
	void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *);
	void (*flush_kern_range)(unsigned long, unsigned long);
	unsigned long tlb_flags;
};

/*
 * Select the calling method
 */
#ifdef MULTI_TLB

#define __cpu_flush_user_tlb_range	cpu_tlb.flush_user_range
#define __cpu_flush_kern_tlb_range	cpu_tlb.flush_kern_range

#else

#define __cpu_flush_user_tlb_range	__glue(_TLB,_flush_user_tlb_range)
#define __cpu_flush_kern_tlb_range	__glue(_TLB,_flush_kern_tlb_range)

extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);

#endif

extern struct cpu_tlb_fns cpu_tlb;

#define __cpu_tlb_flags			cpu_tlb.tlb_flags

/*
 *	TLB Management
 *	==============
 *
 *	The arch/arm/mm/tlb-*.S files implement these methods.
 *
 *	The TLB specific code is expected to perform whatever tests it
 *	needs to determine if it should invalidate the TLB for each
 *	call.  Start addresses are inclusive and end addresses are
 *	exclusive; it is safe to round these addresses down.
 *
 *	flush_tlb_all()
 *
 *		Invalidate the entire TLB.
 *
 *	flush_tlb_mm(mm)
 *
 *		Invalidate all TLB entries in a particular address
 *		space.
 *		- mm	- mm_struct describing address space
 *
 *	flush_tlb_range(mm,start,end)
 *
 *		Invalidate a range of TLB entries in the specified
 *		address space.
 *		- mm	- mm_struct describing address space
 *		- start - start address (may not be aligned)
 *		- end	- end address (exclusive, may not be aligned)
 *
 *	flush_tlb_page(vaddr,vma)
 *
 *		Invalidate the specified page in the specified address range.
 *		- vaddr - virtual address (may not be aligned)
 *		- vma	- vma_struct describing address range
 *
 *	flush_kern_tlb_page(kaddr)
 *
 *		Invalidate the TLB entry for the specified page.  The address
 *		will be in the kernels virtual memory space.  Current uses
 *		only require the D-TLB to be invalidated.
 *		- kaddr - Kernel virtual memory address
 */

/*
 * We optimise the code below by:
 *  - building a set of TLB flags that might be set in __cpu_tlb_flags
 *  - building a set of TLB flags that will always be set in __cpu_tlb_flags
 *  - if we're going to need __cpu_tlb_flags, access it once and only once
 *
 * This allows us to build optimal assembly for the single-CPU type case,
 * and as close to optimal given the compiler constrants for multi-CPU
 * case.  We could do better for the multi-CPU case if the compiler
 * implemented the "%?" method, but this has been discontinued due to too
 * many people getting it wrong.
 */
#define possible_tlb_flags	(v4_possible_flags | \
				 v4wbi_possible_flags | \
				 fr_possible_flags | \
				 v4wb_possible_flags | \
				 fa_possible_flags | \
				 v6wbi_possible_flags | \
				 v7wbi_possible_flags)

#define always_tlb_flags	(v4_always_flags & \
				 v4wbi_always_flags & \
				 fr_always_flags & \
				 v4wb_always_flags & \
				 fa_always_flags & \
				 v6wbi_always_flags & \
				 v7wbi_always_flags)

#define tlb_flag(f)	((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f)))

#define __tlb_op(f, insnarg, arg)					\
	do {								\
		if (always_tlb_flags & (f))				\
			asm("mcr " insnarg				\
			    : : "r" (arg) : "cc");			\
		else if (possible_tlb_flags & (f))			\
			asm("tst %1, %2\n\t"				\
			    "mcrne " insnarg				\
			    : : "r" (arg), "r" (__tlb_flag), "Ir" (f)	\
			    : "cc");					\
	} while (0)

#define tlb_op(f, regs, arg)	__tlb_op(f, "p15, 0, %0, " regs, arg)
#define tlb_l2_op(f, regs, arg)	__tlb_op(f, "p15, 1, %0, " regs, arg)

static inline void __local_flush_tlb_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	tlb_op(TLB_V4_U_FULL | TLB_V6_U_FULL, "c8, c7, 0", zero);
	tlb_op(TLB_V4_D_FULL | TLB_V6_D_FULL, "c8, c6, 0", zero);
	tlb_op(TLB_V4_I_FULL | TLB_V6_I_FULL, "c8, c5, 0", zero);
}

static inline void local_flush_tlb_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (tlb_flag(TLB_WB))
		dsb(nshst);

	__local_flush_tlb_all();
	tlb_op(TLB_V7_UIS_FULL, "c8, c7, 0", zero);

	if (tlb_flag(TLB_BARRIER)) {
		dsb(nsh);
		isb();
	}
}

static inline void __flush_tlb_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (tlb_flag(TLB_WB))
		dsb(ishst);

	__local_flush_tlb_all();
	tlb_op(TLB_V7_UIS_FULL, "c8, c3, 0", zero);

	if (tlb_flag(TLB_BARRIER)) {
		dsb(ish);
		isb();
	}
}

static inline void __local_flush_tlb_mm(struct mm_struct *mm)
{
	const int zero = 0;
	const int asid = ASID(mm);
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (possible_tlb_flags & (TLB_V4_U_FULL|TLB_V4_D_FULL|TLB_V4_I_FULL)) {
		if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) {
			tlb_op(TLB_V4_U_FULL, "c8, c7, 0", zero);
			tlb_op(TLB_V4_D_FULL, "c8, c6, 0", zero);
			tlb_op(TLB_V4_I_FULL, "c8, c5, 0", zero);
		}
	}

	tlb_op(TLB_V6_U_ASID, "c8, c7, 2", asid);
	tlb_op(TLB_V6_D_ASID, "c8, c6, 2", asid);
	tlb_op(TLB_V6_I_ASID, "c8, c5, 2", asid);
}

static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
	const int asid = ASID(mm);
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (tlb_flag(TLB_WB))
		dsb(nshst);

	__local_flush_tlb_mm(mm);
	tlb_op(TLB_V7_UIS_ASID, "c8, c7, 2", asid);

	if (tlb_flag(TLB_BARRIER))
		dsb(nsh);
}

static inline void __flush_tlb_mm(struct mm_struct *mm)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (tlb_flag(TLB_WB))
		dsb(ishst);

	__local_flush_tlb_mm(mm);
#ifdef CONFIG_ARM_ERRATA_720789
	tlb_op(TLB_V7_UIS_ASID, "c8, c3, 0", 0);
#else
	tlb_op(TLB_V7_UIS_ASID, "c8, c3, 2", ASID(mm));
#endif

	if (tlb_flag(TLB_BARRIER))
		dsb(ish);
}

static inline void
__local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm);

	if (possible_tlb_flags & (TLB_V4_U_PAGE|TLB_V4_D_PAGE|TLB_V4_I_PAGE|TLB_V4_I_FULL) &&
	    cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
		tlb_op(TLB_V4_U_PAGE, "c8, c7, 1", uaddr);
		tlb_op(TLB_V4_D_PAGE, "c8, c6, 1", uaddr);
		tlb_op(TLB_V4_I_PAGE, "c8, c5, 1", uaddr);
		if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
			asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");
	}

	tlb_op(TLB_V6_U_PAGE, "c8, c7, 1", uaddr);
	tlb_op(TLB_V6_D_PAGE, "c8, c6, 1", uaddr);
	tlb_op(TLB_V6_I_PAGE, "c8, c5, 1", uaddr);
}

static inline void
local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm);

	if (tlb_flag(TLB_WB))
		dsb(nshst);

	__local_flush_tlb_page(vma, uaddr);
	tlb_op(TLB_V7_UIS_PAGE, "c8, c7, 1", uaddr);

	if (tlb_flag(TLB_BARRIER))
		dsb(nsh);
}

static inline void
__flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm);

	if (tlb_flag(TLB_WB))
		dsb(ishst);

	__local_flush_tlb_page(vma, uaddr);
#ifdef CONFIG_ARM_ERRATA_720789
	tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 3", uaddr & PAGE_MASK);
#else
	tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 1", uaddr);
#endif

	if (tlb_flag(TLB_BARRIER))
		dsb(ish);
}

static inline void __local_flush_tlb_kernel_page(unsigned long kaddr)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	tlb_op(TLB_V4_U_PAGE, "c8, c7, 1", kaddr);
	tlb_op(TLB_V4_D_PAGE, "c8, c6, 1", kaddr);
	tlb_op(TLB_V4_I_PAGE, "c8, c5, 1", kaddr);
	if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
		asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");

	tlb_op(TLB_V6_U_PAGE, "c8, c7, 1", kaddr);
	tlb_op(TLB_V6_D_PAGE, "c8, c6, 1", kaddr);
	tlb_op(TLB_V6_I_PAGE, "c8, c5, 1", kaddr);
}

static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	kaddr &= PAGE_MASK;

	if (tlb_flag(TLB_WB))
		dsb(nshst);

	__local_flush_tlb_kernel_page(kaddr);
	tlb_op(TLB_V7_UIS_PAGE, "c8, c7, 1", kaddr);

	if (tlb_flag(TLB_BARRIER)) {
		dsb(nsh);
		isb();
	}
}

static inline void __flush_tlb_kernel_page(unsigned long kaddr)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	kaddr &= PAGE_MASK;

	if (tlb_flag(TLB_WB))
		dsb(ishst);

	__local_flush_tlb_kernel_page(kaddr);
	tlb_op(TLB_V7_UIS_PAGE, "c8, c3, 1", kaddr);

	if (tlb_flag(TLB_BARRIER)) {
		dsb(ish);
		isb();
	}
}

/*
 * Branch predictor maintenance is paired with full TLB invalidation, so
 * there is no need for any barriers here.
 */
static inline void __local_flush_bp_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	if (tlb_flag(TLB_V6_BP))
		asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero));
}

static inline void local_flush_bp_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	__local_flush_bp_all();
	if (tlb_flag(TLB_V7_UIS_BP))
		asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero));
}

static inline void __flush_bp_all(void)
{
	const int zero = 0;
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	__local_flush_bp_all();
	if (tlb_flag(TLB_V7_UIS_BP))
		asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero));
}

/*
 *	flush_pmd_entry
 *
 *	Flush a PMD entry (word aligned, or double-word aligned) to
 *	RAM if the TLB for the CPU we are running on requires this.
 *	This is typically used when we are creating PMD entries.
 *
 *	clean_pmd_entry
 *
 *	Clean (but don't drain the write buffer) if the CPU requires
 *	these operations.  This is typically used when we are removing
 *	PMD entries.
 */
static inline void flush_pmd_entry(void *pmd)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	tlb_op(TLB_DCLEAN, "c7, c10, 1	@ flush_pmd", pmd);
	tlb_l2_op(TLB_L2CLEAN_FR, "c15, c9, 1  @ L2 flush_pmd", pmd);

	if (tlb_flag(TLB_WB))
		dsb(ishst);
}

static inline void clean_pmd_entry(void *pmd)
{
	const unsigned int __tlb_flag = __cpu_tlb_flags;

	tlb_op(TLB_DCLEAN, "c7, c10, 1	@ flush_pmd", pmd);
	tlb_l2_op(TLB_L2CLEAN_FR, "c15, c9, 1  @ L2 flush_pmd", pmd);
}

#undef tlb_op
#undef tlb_flag
#undef always_tlb_flags
#undef possible_tlb_flags

/*
 * Convert calls to our calling convention.
 */
#define local_flush_tlb_range(vma,start,end)	__cpu_flush_user_tlb_range(start,end,vma)
#define local_flush_tlb_kernel_range(s,e)	__cpu_flush_kern_tlb_range(s,e)

#ifndef CONFIG_SMP
#define flush_tlb_all		local_flush_tlb_all
#define flush_tlb_mm		local_flush_tlb_mm
#define flush_tlb_page		local_flush_tlb_page
#define flush_tlb_kernel_page	local_flush_tlb_kernel_page
#define flush_tlb_range		local_flush_tlb_range
#define flush_tlb_kernel_range	local_flush_tlb_kernel_range
#define flush_bp_all		local_flush_bp_all
#else
extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
extern void flush_tlb_kernel_page(unsigned long kaddr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void flush_bp_all(void);
#endif

/*
 * If PG_dcache_clean is not set for the page, we need to ensure that any
 * cache entries for the kernels virtual memory range are written
 * back to the page. On ARMv6 and later, the cache coherency is handled via
 * the set_pte_at() function.
 */
#if __LINUX_ARM_ARCH__ < 6
extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
	pte_t *ptep);
#else
static inline void update_mmu_cache(struct vm_area_struct *vma,
				    unsigned long addr, pte_t *ptep)
{
}
#endif

#define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)

#endif

#elif defined(CONFIG_SMP)	/* !CONFIG_MMU */

#ifndef __ASSEMBLY__
static inline void local_flush_tlb_all(void)									{ }
static inline void local_flush_tlb_mm(struct mm_struct *mm)							{ }
static inline void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)			{ }
static inline void local_flush_tlb_kernel_page(unsigned long kaddr)						{ }
static inline void local_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)	{ }
static inline void local_flush_tlb_kernel_range(unsigned long start, unsigned long end)				{ }
static inline void local_flush_bp_all(void)									{ }

extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
extern void flush_tlb_kernel_page(unsigned long kaddr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void flush_bp_all(void);
#endif	/* __ASSEMBLY__ */

#endif

#ifndef __ASSEMBLY__
#ifdef CONFIG_ARM_ERRATA_798181
extern void erratum_a15_798181_init(void);
#else
static inline void erratum_a15_798181_init(void) {}
#endif
extern bool (*erratum_a15_798181_handler)(void);

static inline bool erratum_a15_798181(void)
{
	if (unlikely(IS_ENABLED(CONFIG_ARM_ERRATA_798181) &&
		erratum_a15_798181_handler))
		return erratum_a15_798181_handler();
	return false;
}
#endif

#endif