alistair23-linux/arch/arm/mm/tlb-v4.S

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  linux/arch/arm/mm/tlbv4.S
 *
 *  Copyright (C) 1997-2002 Russell King
 *
 *  ARM architecture version 4 TLB handling functions.
 *  These assume a split I/D TLBs, and no write buffer.
 *
 * Processors: ARM720T
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/tlbflush.h>
#include "proc-macros.S"

	.align	5
/*
 *	v4_flush_user_tlb_range(start, end, mm)
 *
 *	Invalidate a range of TLB entries in the specified user address space.
 *
 *	- start - range start address
 *	- end   - range end address
 *	- mm    - mm_struct describing address space
 */
	.align	5
ENTRY(v4_flush_user_tlb_range)
	vma_vm_mm ip, r2
	act_mm	r3				@ get current->active_mm
	eors	r3, ip, r3				@ == mm ?
	retne	lr				@ no, we dont do anything
.v4_flush_kern_tlb_range:
	bic	r0, r0, #0x0ff
	bic	r0, r0, #0xf00
1:	mcr	p15, 0, r0, c8, c7, 1		@ invalidate TLB entry
	add	r0, r0, #PAGE_SZ
	cmp	r0, r1
	blo	1b
	ret	lr

/*
 *	v4_flush_kern_tlb_range(start, end)
 *
 *	Invalidate a range of TLB entries in the specified kernel
 *	address range.
 *
 *	- start - virtual address (may not be aligned)
 *	- end   - virtual address (may not be aligned)
 */
.globl v4_flush_kern_tlb_range
.equ v4_flush_kern_tlb_range, .v4_flush_kern_tlb_range

	__INITDATA

	/* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
	define_tlb_functions v4, v4_tlb_flags