/* * linux/arch/arm/mm/tlb-v6.S * * Copyright (C) 1997-2002 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * ARM architecture version 6 TLB handling functions. * These assume a split I/D TLB. */ #include <linux/linkage.h> #include <asm/asm-offsets.h> #include <asm/page.h> #include <asm/tlbflush.h> #include "proc-macros.S" #define HARVARD_TLB /* * v6wbi_flush_user_tlb_range(start, end, vma) * * Invalidate a range of TLB entries in the specified address space. * * - start - start address (may not be aligned) * - end - end address (exclusive, may not be aligned) * - vma - vma_struct describing address range * * It is assumed that: * - the "Invalidate single entry" instruction will invalidate * both the I and the D TLBs on Harvard-style TLBs */ ENTRY(v6wbi_flush_user_tlb_range) vma_vm_mm r3, r2 @ get vma->vm_mm mov ip, #0 mmid r3, r3 @ get vm_mm->context.id mcr p15, 0, ip, c7, c10, 4 @ drain write buffer mov r0, r0, lsr #PAGE_SHIFT @ align address mov r1, r1, lsr #PAGE_SHIFT asid r3, r3 @ mask ASID orr r0, r3, r0, lsl #PAGE_SHIFT @ Create initial MVA mov r1, r1, lsl #PAGE_SHIFT vma_vm_flags r2, r2 @ get vma->vm_flags 1: #ifdef HARVARD_TLB mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1) tst r2, #VM_EXEC @ Executable area ? mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1) #else mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA (was 1) #endif add r0, r0, #PAGE_SZ cmp r0, r1 blo 1b mcr p15, 0, ip, c7, c5, 6 @ flush BTAC/BTB mcr p15, 0, ip, c7, c10, 4 @ data synchronization barrier mov pc, lr /* * v6wbi_flush_kern_tlb_range(start,end) * * Invalidate a range of kernel TLB entries * * - start - start address (may not be aligned) * - end - end address (exclusive, may not be aligned) */ ENTRY(v6wbi_flush_kern_tlb_range) mov r2, #0 mcr p15, 0, r2, c7, c10, 4 @ drain write buffer mov r0, r0, lsr #PAGE_SHIFT @ align address mov r1, r1, lsr #PAGE_SHIFT mov r0, r0, lsl #PAGE_SHIFT mov r1, r1, lsl #PAGE_SHIFT 1: #ifdef HARVARD_TLB mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA #else mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate MVA #endif add r0, r0, #PAGE_SZ cmp r0, r1 blo 1b mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB mcr p15, 0, r2, c7, c10, 4 @ data synchronization barrier mcr p15, 0, r2, c7, c5, 4 @ prefetch flush mov pc, lr .section ".text.init", #alloc, #execinstr .type v6wbi_tlb_fns, #object ENTRY(v6wbi_tlb_fns) .long v6wbi_flush_user_tlb_range .long v6wbi_flush_kern_tlb_range .long v6wbi_tlb_flags .size v6wbi_tlb_fns, . - v6wbi_tlb_fns