xref: /openbmc/linux/arch/arm/mm/tlb-fa.S (revision b6dcefde)
1/*
2 *  linux/arch/arm/mm/tlb-fa.S
3 *
4 *  Copyright (C) 2005 Faraday Corp.
5 *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
6 *
7 * Based on tlb-v4wbi.S:
8 *  Copyright (C) 1997-2002 Russell King
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 *  ARM architecture version 4, Faraday variation.
15 *  This assume an unified TLBs, with a write buffer, and branch target buffer (BTB)
16 *
17 *  Processors: FA520 FA526 FA626
18 */
19#include <linux/linkage.h>
20#include <linux/init.h>
21#include <asm/asm-offsets.h>
22#include <asm/tlbflush.h>
23#include "proc-macros.S"
24
25
26/*
27 *	flush_user_tlb_range(start, end, mm)
28 *
29 *	Invalidate a range of TLB entries in the specified address space.
30 *
31 *	- start - range start address
32 *	- end   - range end address
33 *	- mm    - mm_struct describing address space
34 */
35	.align	4
36ENTRY(fa_flush_user_tlb_range)
37	vma_vm_mm ip, r2
38	act_mm	r3				@ get current->active_mm
39	eors	r3, ip, r3			@ == mm ?
40	movne	pc, lr				@ no, we dont do anything
41	mov	r3, #0
42	mcr	p15, 0, r3, c7, c10, 4		@ drain WB
43	bic	r0, r0, #0x0ff
44	bic	r0, r0, #0xf00
451:	mcr	p15, 0, r0, c8, c7, 1		@ invalidate UTLB entry
46	add	r0, r0, #PAGE_SZ
47	cmp	r0, r1
48	blo	1b
49	mcr	p15, 0, r3, c7, c5, 6		@ invalidate BTB
50	mcr	p15, 0, r3, c7, c10, 4		@ data write barrier
51	mov	pc, lr
52
53
54ENTRY(fa_flush_kern_tlb_range)
55	mov	r3, #0
56	mcr	p15, 0, r3, c7, c10, 4		@ drain WB
57	bic	r0, r0, #0x0ff
58	bic	r0, r0, #0xf00
591:	mcr	p15, 0, r0, c8, c7, 1		@ invalidate UTLB entry
60	add	r0, r0, #PAGE_SZ
61	cmp	r0, r1
62	blo	1b
63	mcr	p15, 0, r3, c7, c5, 6		@ invalidate BTB
64	mcr	p15, 0, r3, c7, c10, 4		@ data write barrier
65	mcr	p15, 0, r3, c7, c5, 4		@ prefetch flush
66	mov	pc, lr
67
68	__INITDATA
69
70	.type	fa_tlb_fns, #object
71ENTRY(fa_tlb_fns)
72	.long	fa_flush_user_tlb_range
73	.long	fa_flush_kern_tlb_range
74	.long	fa_tlb_flags
75	.size	fa_tlb_fns, . - fa_tlb_fns
76