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28853ac8 PZ |
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 | |
36 | ENTRY(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 | |
45 | 1: 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 | ||
54 | ENTRY(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 | |
59 | 1: 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 | |
71 | ENTRY(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 |