1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * linux/arch/arm/mm/tlb-fa.S |
4 | * |
5 | * Copyright (C) 2005 Faraday Corp. |
6 | * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
7 | * |
8 | * Based on tlb-v4wbi.S: |
9 | * Copyright (C) 1997-2002 Russell King |
10 | * |
11 | * ARM architecture version 4, Faraday variation. |
12 | * This assume an unified TLBs, with a write buffer, and branch target buffer (BTB) |
13 | * |
14 | * Processors: FA520 FA526 FA626 |
15 | */ |
16 | #include <linux/linkage.h> |
17 | #include <linux/init.h> |
18 | #include <asm/assembler.h> |
19 | #include <asm/asm-offsets.h> |
20 | #include <asm/tlbflush.h> |
21 | #include "proc-macros.S" |
22 | |
23 | |
24 | /* |
25 | * flush_user_tlb_range(start, end, mm) |
26 | * |
27 | * Invalidate a range of TLB entries in the specified address space. |
28 | * |
29 | * - start - range start address |
30 | * - end - range end address |
31 | * - mm - mm_struct describing address space |
32 | */ |
33 | .align 4 |
34 | ENTRY(fa_flush_user_tlb_range) |
35 | vma_vm_mm ip, r2 |
36 | act_mm r3 @ get current->active_mm |
37 | eors r3, ip, r3 @ == mm ? |
38 | retne lr @ no, we dont do anything |
39 | mov r3, #0 |
40 | mcr p15, 0, r3, c7, c10, 4 @ drain WB |
41 | bic r0, r0, #0x0ff |
42 | bic r0, r0, #0xf00 |
43 | 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry |
44 | add r0, r0, #PAGE_SZ |
45 | cmp r0, r1 |
46 | blo 1b |
47 | mcr p15, 0, r3, c7, c10, 4 @ data write barrier |
48 | ret lr |
49 | |
50 | |
51 | ENTRY(fa_flush_kern_tlb_range) |
52 | mov r3, #0 |
53 | mcr p15, 0, r3, c7, c10, 4 @ drain WB |
54 | bic r0, r0, #0x0ff |
55 | bic r0, r0, #0xf00 |
56 | 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry |
57 | add r0, r0, #PAGE_SZ |
58 | cmp r0, r1 |
59 | blo 1b |
60 | mcr p15, 0, r3, c7, c10, 4 @ data write barrier |
61 | mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb) |
62 | ret lr |
63 | |
64 | __INITDATA |
65 | |
66 | /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ |
67 | define_tlb_functions fa, fa_tlb_flags |
68 | |