1/* 2 * linux/arch/arm/mm/tlb-v7.S 3 * 4 * Copyright (C) 1997-2002 Russell King 5 * Modified for ARMv7 by Catalin Marinas 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * ARM architecture version 6 TLB handling functions. 12 * These assume a split I/D TLB. 13 */ 14#include <linux/init.h> 15#include <linux/linkage.h> 16#include <asm/asm-offsets.h> 17#include <asm/page.h> 18#include <asm/tlbflush.h> 19#include "proc-macros.S" 20 21/* 22 * v7wbi_flush_user_tlb_range(start, end, vma) 23 * 24 * Invalidate a range of TLB entries in the specified address space. 25 * 26 * - start - start address (may not be aligned) 27 * - end - end address (exclusive, may not be aligned) 28 * - vma - vma_struct describing address range 29 * 30 * It is assumed that: 31 * - the "Invalidate single entry" instruction will invalidate 32 * both the I and the D TLBs on Harvard-style TLBs 33 */ 34ENTRY(v7wbi_flush_user_tlb_range) 35 vma_vm_mm r3, r2 @ get vma->vm_mm 36 mmid r3, r3 @ get vm_mm->context.id 37 dsb 38 mov r0, r0, lsr #PAGE_SHIFT @ align address 39 mov r1, r1, lsr #PAGE_SHIFT 40 asid r3, r3 @ mask ASID 41 orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA 42 mov r1, r1, lsl #PAGE_SHIFT 43 vma_vm_flags r2, r2 @ get vma->vm_flags 441: 45 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1) 46 tst r2, #VM_EXEC @ Executable area ? 47 mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1) 48 add r0, r0, #PAGE_SZ 49 cmp r0, r1 50 blo 1b 51 mov ip, #0 52 mcr p15, 0, ip, c7, c5, 6 @ flush BTAC/BTB 53 dsb 54 mov pc, lr 55ENDPROC(v7wbi_flush_user_tlb_range) 56 57/* 58 * v7wbi_flush_kern_tlb_range(start,end) 59 * 60 * Invalidate a range of kernel TLB entries 61 * 62 * - start - start address (may not be aligned) 63 * - end - end address (exclusive, may not be aligned) 64 */ 65ENTRY(v7wbi_flush_kern_tlb_range) 66 dsb 67 mov r0, r0, lsr #PAGE_SHIFT @ align address 68 mov r1, r1, lsr #PAGE_SHIFT 69 mov r0, r0, lsl #PAGE_SHIFT 70 mov r1, r1, lsl #PAGE_SHIFT 711: 72 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA 73 mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA 74 add r0, r0, #PAGE_SZ 75 cmp r0, r1 76 blo 1b 77 mov r2, #0 78 mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB 79 dsb 80 isb 81 mov pc, lr 82ENDPROC(v7wbi_flush_kern_tlb_range) 83 84 __INIT 85 86 .type v7wbi_tlb_fns, #object 87ENTRY(v7wbi_tlb_fns) 88 .long v7wbi_flush_user_tlb_range 89 .long v7wbi_flush_kern_tlb_range 90 .long v6wbi_tlb_flags 91 .size v7wbi_tlb_fns, . - v7wbi_tlb_fns 92