cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

mmu_context.h (1544B)

      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