1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * linux/arch/arm/mm/tlbv4wb.S 4 * 5 * Copyright (C) 1997-2002 Russell King 6 * 7 * ARM architecture version 4 TLB handling functions. 8 * These assume a split I/D TLBs w/o I TLB entry, with a write buffer. 9 * 10 * Processors: SA110 SA1100 SA1110 11 */ 12#include <linux/linkage.h> 13#include <linux/init.h> 14#include <asm/assembler.h> 15#include <asm/asm-offsets.h> 16#include <asm/tlbflush.h> 17#include "proc-macros.S" 18 19 .align 5 20/* 21 * v4wb_flush_user_tlb_range(start, end, mm) 22 * 23 * Invalidate a range of TLB entries in the specified address space. 24 * 25 * - start - range start address 26 * - end - range end address 27 * - mm - mm_struct describing address space 28 */ 29 .align 5 30ENTRY(v4wb_flush_user_tlb_range) 31 vma_vm_mm ip, r2 32 act_mm r3 @ get current->active_mm 33 eors r3, ip, r3 @ == mm ? 34 retne lr @ no, we dont do anything 35 vma_vm_flags r2, r2 36 mcr p15, 0, r3, c7, c10, 4 @ drain WB 37 tst r2, #VM_EXEC 38 mcrne p15, 0, r3, c8, c5, 0 @ invalidate I TLB 39 bic r0, r0, #0x0ff 40 bic r0, r0, #0xf00 411: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 42 add r0, r0, #PAGE_SZ 43 cmp r0, r1 44 blo 1b 45 ret lr 46 47/* 48 * v4_flush_kern_tlb_range(start, end) 49 * 50 * Invalidate a range of TLB entries in the specified kernel 51 * address range. 52 * 53 * - start - virtual address (may not be aligned) 54 * - end - virtual address (may not be aligned) 55 */ 56ENTRY(v4wb_flush_kern_tlb_range) 57 mov r3, #0 58 mcr p15, 0, r3, c7, c10, 4 @ drain WB 59 bic r0, r0, #0x0ff 60 bic r0, r0, #0xf00 61 mcr p15, 0, r3, c8, c5, 0 @ invalidate I TLB 621: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 63 add r0, r0, #PAGE_SZ 64 cmp r0, r1 65 blo 1b 66 ret lr 67 68 __INITDATA 69 70 /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ 71 define_tlb_functions v4wb, v4wb_tlb_flags 72