arch/riscv/include/asm/mmu_context.h

   1 /*
   2  * Copyright (C) 2012 Regents of the University of California
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #ifndef _ASM_RISCV_MMU_CONTEXT_H
  15 #define _ASM_RISCV_MMU_CONTEXT_H
  16
  17 #include <asm-generic/mm_hooks.h>
  18
  19 #include <linux/mm.h>
  20 #include <linux/sched.h>
  21 #include <asm/tlbflush.h>
  22
  23 static inline void enter_lazy_tlb(struct mm_struct *mm,
  24         struct task_struct *task)
  25 {
  26 }
  27
  28 /* Initialize context-related info for a new mm_struct */
  29 static inline int init_new_context(struct task_struct *task,
  30         struct mm_struct *mm)
  31 {
  32         return 0;
  33 }
  34
  35 static inline void destroy_context(struct mm_struct *mm)
  36 {
  37 }
  38
  39 static inline pgd_t *current_pgdir(void)
  40 {
  41         return pfn_to_virt(csr_read(sptbr) & SPTBR_PPN);
  42 }
  43
  44 static inline void set_pgdir(pgd_t *pgd)
  45 {
  46         csr_write(sptbr, virt_to_pfn(pgd) | SPTBR_MODE);
  47 }
  48
  49 static inline void switch_mm(struct mm_struct *prev,
  50         struct mm_struct *next, struct task_struct *task)
  51 {
  52         if (likely(prev != next)) {
  53                 set_pgdir(next->pgd);
  54                 local_flush_tlb_all();
  55         }
  56 }
  57
  58 static inline void activate_mm(struct mm_struct *prev,
  59                                struct mm_struct *next)
  60 {
  61         switch_mm(prev, next, NULL);
  62 }
  63
  64 static inline void deactivate_mm(struct task_struct *task,
  65         struct mm_struct *mm)
  66 {
  67 }
  68
  69 #endif /* _ASM_RISCV_MMU_CONTEXT_H */