1/* 2 * linux/arch/arm/mm/tlb-v6.S 3 * 4 * Copyright (C) 1997-2002 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * ARM architecture version 6 TLB handling functions. 11 * These assume a split I/D TLB. 12 */ 13#include <linux/init.h> 14#include <linux/linkage.h> 15#include <asm/asm-offsets.h> 16#include <asm/assembler.h> 17#include <asm/page.h> 18#include <asm/tlbflush.h> 19#include "proc-macros.S" 20 21#define HARVARD_TLB 22 23/* 24 * v6wbi_flush_user_tlb_range(start, end, vma) 25 * 26 * Invalidate a range of TLB entries in the specified address space. 27 * 28 * - start - start address (may not be aligned) 29 * - end - end address (exclusive, may not be aligned) 30 * - vma - vma_struct describing address range 31 * 32 * It is assumed that: 33 * - the "Invalidate single entry" instruction will invalidate 34 * both the I and the D TLBs on Harvard-style TLBs 35 */ 36ENTRY(v6wbi_flush_user_tlb_range) 37 vma_vm_mm r3, r2 @ get vma->vm_mm 38 mov ip, #0 39 mmid r3, r3 @ get vm_mm->context.id 40 mcr p15, 0, ip, c7, c10, 4 @ drain write buffer 41 mov r0, r0, lsr #PAGE_SHIFT @ align address 42 mov r1, r1, lsr #PAGE_SHIFT 43 asid r3, r3 @ mask ASID 44 orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA 45 mov r1, r1, lsl #PAGE_SHIFT 46 vma_vm_flags r2, r2 @ get vma->vm_flags 471: 48#ifdef HARVARD_TLB 49 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1) 50 tst r2, #VM_EXEC @ Executable area ? 51 mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1) 52#else 53 mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA (was 1) 54#endif 55 add r0, r0, #PAGE_SZ 56 cmp r0, r1 57 blo 1b 58 mcr p15, 0, ip, c7, c10, 4 @ data synchronization barrier 59 ret lr 60 61/* 62 * v6wbi_flush_kern_tlb_range(start,end) 63 * 64 * Invalidate a range of kernel TLB entries 65 * 66 * - start - start address (may not be aligned) 67 * - end - end address (exclusive, may not be aligned) 68 */ 69ENTRY(v6wbi_flush_kern_tlb_range) 70 mov r2, #0 71 mcr p15, 0, r2, c7, c10, 4 @ drain write buffer 72 mov r0, r0, lsr #PAGE_SHIFT @ align address 73 mov r1, r1, lsr #PAGE_SHIFT 74 mov r0, r0, lsl #PAGE_SHIFT 75 mov r1, r1, lsl #PAGE_SHIFT 761: 77#ifdef HARVARD_TLB 78 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA 79 mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA 80#else 81 mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA 82#endif 83 add r0, r0, #PAGE_SZ 84 cmp r0, r1 85 blo 1b 86 mcr p15, 0, r2, c7, c10, 4 @ data synchronization barrier 87 mcr p15, 0, r2, c7, c5, 4 @ prefetch flush (isb) 88 ret lr 89 90 __INIT 91 92 /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ 93 define_tlb_functions v6wbi, v6wbi_tlb_flags 94