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 <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" 23 24 25 /* 26 * flush_user_tlb_range(start, end, mm) 27 * 28 * Invalidate a range of TLB entries in the specified address space. 29 * 30 * - start - range start address 31 * - end - range end address 32 * - mm - mm_struct describing address space 33 */ 34 .align 4 35 SYM_TYPED_FUNC_START(fa_flush_user_tlb_range) 36 vma_vm_mm ip, r2 37 act_mm r3 @ get current->active_mm 38 eors r3, ip, r3 @ == mm ? 39 retne lr @ no, we dont do anything 40 mov r3, #0 41 mcr p15, 0, r3, c7, c10, 4 @ drain WB 42 bic r0, r0, #0x0ff 43 bic r0, r0, #0xf00 44 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry 45 add r0, r0, #PAGE_SZ 46 cmp r0, r1 47 blo 1b 48 mcr p15, 0, r3, c7, c10, 4 @ data write barrier 49 ret lr 50 SYM_FUNC_END(fa_flush_user_tlb_range) 51 52 53 SYM_TYPED_FUNC_START(fa_flush_kern_tlb_range) 54 mov r3, #0 55 mcr p15, 0, r3, c7, c10, 4 @ drain WB 56 bic r0, r0, #0x0ff 57 bic r0, r0, #0xf00 58 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry 59 add r0, r0, #PAGE_SZ 60 cmp r0, r1 61 blo 1b 62 mcr p15, 0, r3, c7, c10, 4 @ data write barrier 63 mcr p15, 0, r3, c7, c5, 4 @ prefetch flush (isb) 64 ret lr 65 SYM_FUNC_END(fa_flush_kern_tlb_range)
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