diff options
Diffstat (limited to 'arch/arm/mm/tlb-v6.S')
| -rw-r--r-- | arch/arm/mm/tlb-v6.S | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/arm/mm/tlb-v6.S b/arch/arm/mm/tlb-v6.S new file mode 100644 index 000000000..74f4b383a --- /dev/null +++ b/arch/arm/mm/tlb-v6.S @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mm/tlb-v6.S + * + * Copyright (C) 1997-2002 Russell King + * + * ARM architecture version 6 TLB handling functions. + * These assume a split I/D TLB. + */ +#include <linux/init.h> +#include <linux/linkage.h> +#include <asm/asm-offsets.h> +#include <asm/assembler.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 - vm_area_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, c10, 4 @ data synchronization barrier + ret 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, c10, 4 @ data synchronization barrier + mcr p15, 0, r2, c7, c5, 4 @ prefetch flush (isb) + ret lr + + __INIT + + /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ + define_tlb_functions v6wbi, v6wbi_tlb_flags |