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Paulius Zaleckas28853ac2009-03-25 13:10:01 +02001/*
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
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020049 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
50 mov pc, lr
51
52
53ENTRY(fa_flush_kern_tlb_range)
54 mov r3, #0
55 mcr p15, 0, r3, c7, c10, 4 @ drain WB
56 bic r0, r0, #0x0ff
57 bic r0, r0, #0xf00
581: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
59 add r0, r0, #PAGE_SZ
60 cmp r0, r1
61 blo 1b
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020062 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
Russell King43488102011-07-05 09:01:13 +010063 mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb)
Paulius Zaleckas28853ac2009-03-25 13:10:01 +020064 mov pc, lr
65
66 __INITDATA
67
Dave Martin27eebe42011-06-23 17:28:50 +010068 /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
69 define_tlb_functions fa, fa_tlb_flags