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 <linux/cfi_types.h>
19 #include <asm/assembler.h>
20 #include <asm/asm-offsets.h>
21 #include <asm/tlbflush.h>
22 #include "proc-macros.S"
26 * flush_user_tlb_range(start, end, mm)
28 * Invalidate a range of TLB entries in the specified address space.
30 * - start - range start address
31 * - end - range end address
32 * - mm - mm_struct describing address space
35 SYM_TYPED_FUNC_START(fa_flush_user_tlb_range)
37 act_mm r3 @ get current->active_mm
38 eors r3, ip, r3 @ == mm ?
39 retne lr @ no, we dont do anything
41 mcr p15, 0, r3, c7, c10, 4 @ drain WB
44 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
48 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
50 SYM_FUNC_END(fa_flush_user_tlb_range)
53 SYM_TYPED_FUNC_START(fa_flush_kern_tlb_range)
55 mcr p15, 0, r3, c7, c10, 4 @ drain WB
58 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry
62 mcr p15, 0, r3, c7, c10, 4 @ data write barrier
63 mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb)
65 SYM_FUNC_END(fa_flush_kern_tlb_range)