xref: /openbmc/linux/arch/hexagon/include/asm/mmu_context.h (revision c96c177a)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * MM context support for the Hexagon architecture
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 */

#ifndef _ASM_MMU_CONTEXT_H
#define _ASM_MMU_CONTEXT_H

#include <linux/mm_types.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/mem-layout.h>

/*
 * VM port hides all TLB management, so "lazy TLB" isn't very
 * meaningful.  Even for ports to architectures with visble TLBs,
 * this is almost invariably a null function.
 *
 * mm->context is set up by pgd_alloc, so no init_new_context required.
 */

/*
 *  Switch active mm context
 */
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
				struct task_struct *tsk)
{
	int l1;

	/*
	 * For virtual machine, we have to update system map if it's been
	 * touched.
	 */
	if (next->context.generation < prev->context.generation) {
		for (l1 = MIN_KERNEL_SEG; l1 <= max_kernel_seg; l1++)
			next->pgd[l1] = init_mm.pgd[l1];

		next->context.generation = prev->context.generation;
	}

	__vmnewmap((void *)next->context.ptbase);
}

/*
 *  Activate new memory map for task
 */
#define activate_mm activate_mm
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
	unsigned long flags;

	local_irq_save(flags);
	switch_mm(prev, next, current_thread_info()->task);
	local_irq_restore(flags);
}

/*  Generic hooks for arch_dup_mmap and arch_exit_mmap  */
#include <asm-generic/mm_hooks.h>

#include <asm-generic/mmu_context.h>

#endif