1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * linux/arch/arm/mm/tlb-fa.S
5 * Copyright (C) 2005 Faraday Corp.
6 * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
8 * Based on tlb-v4wbi.S:
9 * Copyright (C) 1997-2002 Russell King
11 * ARM architecture version 4, Faraday variation.
12 * This assume an unified TLBs, with a write buffer, and branch target buffer (BTB)
14 * Processors: FA520 FA526 FA626
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"
25 * flush_user_tlb_range(start, end, mm)
27 * Invalidate a range of TLB entries in the specified address space.
29 * - start - range start address
30 * - end - range end address
31 * - mm - mm_struct describing address space
34 ENTRY(fa_flush_user_tlb_range)
36 act_mm r3 @ get current->active_mm
37 eors r3, ip, r3 @ == mm ?
38 retne lr @ no, we dont do anything
40 mcr p15, 0, r3, c7, c10, 4 @ drain WB
43 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
47 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
51 ENTRY(fa_flush_kern_tlb_range)
53 mcr p15, 0, r3, c7, c10, 4 @ drain WB
56 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
60 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
61 mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb)
66 /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
67 define_tlb_functions fa, fa_tlb_flags