arch/hexagon/include/asm/mmu_context.h

   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  */
  29 static 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
  52 static 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