Root/arch/arm/mm/tlb-v7.S

1/*
2 * linux/arch/arm/mm/tlb-v7.S
3 *
4 * Copyright (C) 1997-2002 Russell King
5 * Modified for ARMv7 by Catalin Marinas
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * ARM architecture version 6 TLB handling functions.
12 * These assume a split I/D TLB.
13 */
14#include <linux/init.h>
15#include <linux/linkage.h>
16#include <asm/assembler.h>
17#include <asm/asm-offsets.h>
18#include <asm/page.h>
19#include <asm/tlbflush.h>
20#include "proc-macros.S"
21
22/*
23 * v7wbi_flush_user_tlb_range(start, end, vma)
24 *
25 * Invalidate a range of TLB entries in the specified address space.
26 *
27 * - start - start address (may not be aligned)
28 * - end - end address (exclusive, may not be aligned)
29 * - vma - vma_struct describing address range
30 *
31 * It is assumed that:
32 * - the "Invalidate single entry" instruction will invalidate
33 * both the I and the D TLBs on Harvard-style TLBs
34 */
35ENTRY(v7wbi_flush_user_tlb_range)
36    vma_vm_mm r3, r2 @ get vma->vm_mm
37    mmid r3, r3 @ get vm_mm->context.id
38    dsb
39    mov r0, r0, lsr #PAGE_SHIFT @ align address
40    mov r1, r1, lsr #PAGE_SHIFT
41    asid r3, r3 @ mask ASID
42    orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA
43    mov r1, r1, lsl #PAGE_SHIFT
441:
45    ALT_SMP(mcr p15, 0, r0, c8, c3, 1) @ TLB invalidate U MVA (shareable)
46    ALT_UP(mcr p15, 0, r0, c8, c7, 1) @ TLB invalidate U MVA
47
48    add r0, r0, #PAGE_SZ
49    cmp r0, r1
50    blo 1b
51    mov ip, #0
52    ALT_SMP(mcr p15, 0, ip, c7, c1, 6) @ flush BTAC/BTB Inner Shareable
53    ALT_UP(mcr p15, 0, ip, c7, c5, 6) @ flush BTAC/BTB
54    dsb
55    mov pc, lr
56ENDPROC(v7wbi_flush_user_tlb_range)
57
58/*
59 * v7wbi_flush_kern_tlb_range(start,end)
60 *
61 * Invalidate a range of kernel TLB entries
62 *
63 * - start - start address (may not be aligned)
64 * - end - end address (exclusive, may not be aligned)
65 */
66ENTRY(v7wbi_flush_kern_tlb_range)
67    dsb
68    mov r0, r0, lsr #PAGE_SHIFT @ align address
69    mov r1, r1, lsr #PAGE_SHIFT
70    mov r0, r0, lsl #PAGE_SHIFT
71    mov r1, r1, lsl #PAGE_SHIFT
721:
73    ALT_SMP(mcr p15, 0, r0, c8, c3, 1) @ TLB invalidate U MVA (shareable)
74    ALT_UP(mcr p15, 0, r0, c8, c7, 1) @ TLB invalidate U MVA
75    add r0, r0, #PAGE_SZ
76    cmp r0, r1
77    blo 1b
78    mov r2, #0
79    ALT_SMP(mcr p15, 0, r2, c7, c1, 6) @ flush BTAC/BTB Inner Shareable
80    ALT_UP(mcr p15, 0, r2, c7, c5, 6) @ flush BTAC/BTB
81    dsb
82    isb
83    mov pc, lr
84ENDPROC(v7wbi_flush_kern_tlb_range)
85
86    __INIT
87
88    .type v7wbi_tlb_fns, #object
89ENTRY(v7wbi_tlb_fns)
90    .long v7wbi_flush_user_tlb_range
91    .long v7wbi_flush_kern_tlb_range
92    ALT_SMP(.long v7wbi_tlb_flags_smp)
93    ALT_UP(.long v7wbi_tlb_flags_up)
94    .size v7wbi_tlb_fns, . - v7wbi_tlb_fns
95

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