1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * MM context support for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_MMU_CONTEXT_H
9#define _ASM_MMU_CONTEXT_H
10
11#include <linux/mm_types.h>
12
13#include <asm/setup.h>
14#include <asm/page.h>
15#include <asm/pgalloc.h>
16#include <asm/mem-layout.h>
17
18/*
19 * VM port hides all TLB management, so "lazy TLB" isn't very
20 * meaningful.  Even for ports to architectures with visble TLBs,
21 * this is almost invariably a null function.
22 *
23 * mm->context is set up by pgd_alloc, so no init_new_context required.
24 */
25
26/*
27 *  Switch active mm context
28 */
29static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
30				struct task_struct *tsk)
31{
32	int l1;
33
34	/*
35	 * For virtual machine, we have to update system map if it's been
36	 * touched.
37	 */
38	if (next->context.generation < prev->context.generation) {
39		for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
40			next->pgd[l1] = init_mm.pgd[l1];
41
42		next->context.generation = prev->context.generation;
43	}
44
45	__vmnewmap((void *)next->context.ptbase);
46}
47
48/*
49 *  Activate new memory map for task
50 */
51#define activate_mm activate_mm
52static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
53{
54	unsigned long flags;
55
56	local_irq_save(flags);
57	switch_mm(prev, next, current_thread_info()->task);
58	local_irq_restore(flags);
59}
60
61/*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
62#include <asm-generic/mm_hooks.h>
63
64#include <asm-generic/mmu_context.h>
65
66#endif
67