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/linkage.h> 14#include <asm/constants.h> 15#include <asm/page.h> 16#include <asm/tlbflush.h> 17#include "proc-macros.S" 18 19#define HARVARD_TLB 20 21/* 22 * v6wbi_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(v6wbi_flush_user_tlb_range) 35 vma_vm_mm r3, r2 @ get vma->vm_mm 36 mov ip, #0 37 mmid r3, r3 @ get vm_mm->context.id 38 mcr p15, 0, ip, c7, c10, 4 @ drain write buffer 39 mov r0, r0, lsr #PAGE_SHIFT @ align address 40 mov r1, r1, lsr #PAGE_SHIFT 41 asid r3, r3 @ mask ASID 42 orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA 43 mov r1, r1, lsl #PAGE_SHIFT 44 vma_vm_flags r2, r2 @ get vma->vm_flags 451: 46#ifdef HARVARD_TLB 47 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1) 48 tst r2, #VM_EXEC @ Executable area ? 49 mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1) 50#else 51 mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA (was 1) 52#endif 53 add r0, r0, #PAGE_SZ 54 cmp r0, r1 55 blo 1b 56 mov pc, lr 57 58/* 59 * v6wbi_flush_kern_tlb_range(start,end) 60 * 61 * Invalidate a range of kernel TLB entries 62 * 63 * - start - start address (may not be aligned) 64 * - end - end address (exclusive, may not be aligned) 65 */ 66ENTRY(v6wbi_flush_kern_tlb_range) 67 mov r2, #0 68 mcr p15, 0, r2, c7, c10, 4 @ drain write buffer 69 mov r0, r0, lsr #PAGE_SHIFT @ align address 70 mov r1, r1, lsr #PAGE_SHIFT 71 mov r0, r0, lsl #PAGE_SHIFT 72 mov r1, r1, lsl #PAGE_SHIFT 731: 74#ifdef HARVARD_TLB 75 mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA 76 mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA 77#else 78 mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA 79#endif 80 add r0, r0, #PAGE_SZ 81 cmp r0, r1 82 blo 1b 83 mov pc, lr 84 85 .section ".text.init", #alloc, #execinstr 86 87 .type v6wbi_tlb_fns, #object 88ENTRY(v6wbi_tlb_fns) 89 .long v6wbi_flush_user_tlb_range 90 .long v6wbi_flush_kern_tlb_range 91 .long v6wbi_tlb_flags 92 .size v6wbi_tlb_fns, . - v6wbi_tlb_fns 93