arch/arm/mm/tlb-v7.S

root/arch/arm/mm/tlb-v7.S
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  linux/arch/arm/mm/tlb-v7.S
 *
 *  Copyright (C) 1997-2002 Russell King
 *  Modified for ARMv7 by Catalin Marinas
 *
 *  ARM architecture version 6 TLB handling functions.
 *  These assume a split I/D TLB.
 */
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/page.h>
#include <asm/tlbflush.h>
#include "proc-macros.S"

.arch armv7-a

/*
 *      v7wbi_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
 */
SYM_TYPED_FUNC_START(v7wbi_flush_user_tlb_range)
        vma_vm_mm r3, r2                        @ get vma->vm_mm
        mmid    r3, r3                          @ get vm_mm->context.id
        dsb     ish
        mov     r0, r0, lsr #PAGE_SHIFT         @ align address
        mov     r1, r1, lsr #PAGE_SHIFT
        asid    r3, r3                          @ mask ASID
#ifdef CONFIG_ARM_ERRATA_720789
        ALT_SMP(W(mov)  r3, #0  )
        ALT_UP(W(nop)           )
#endif
        orr     r0, r3, r0, lsl #PAGE_SHIFT     @ Create initial MVA
        mov     r1, r1, lsl #PAGE_SHIFT
1:
#ifdef CONFIG_ARM_ERRATA_720789
        ALT_SMP(mcr     p15, 0, r0, c8, c3, 3)  @ TLB invalidate U MVA all ASID (shareable)
#else
        ALT_SMP(mcr     p15, 0, r0, c8, c3, 1)  @ TLB invalidate U MVA (shareable)
#endif
        ALT_UP(mcr      p15, 0, r0, c8, c7, 1)  @ TLB invalidate U MVA

        add     r0, r0, #PAGE_SZ
        cmp     r0, r1
        blo     1b
        dsb     ish
        ret     lr
SYM_FUNC_END(v7wbi_flush_user_tlb_range)

/*
 *      v7wbi_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)
 */
SYM_TYPED_FUNC_START(v7wbi_flush_kern_tlb_range)
        dsb     ish
        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 CONFIG_ARM_ERRATA_720789
        ALT_SMP(mcr     p15, 0, r0, c8, c3, 3)  @ TLB invalidate U MVA all ASID (shareable)
#else
        ALT_SMP(mcr     p15, 0, r0, c8, c3, 1)  @ TLB invalidate U MVA (shareable)
#endif
        ALT_UP(mcr      p15, 0, r0, c8, c7, 1)  @ TLB invalidate U MVA
        add     r0, r0, #PAGE_SZ
        cmp     r0, r1
        blo     1b
        dsb     ish
        isb
        ret     lr
SYM_FUNC_END(v7wbi_flush_kern_tlb_range)
Linux
