arch/riscv/include/asm/mmu_context.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2017 SiFive
   5  */
   6
   7 #ifndef _ASM_RISCV_MMU_CONTEXT_H
   8 #define _ASM_RISCV_MMU_CONTEXT_H
   9
  10 #include <linux/mm_types.h>
  11 #include <asm-generic/mm_hooks.h>
  12
  13 #include <linux/mm.h>
  14 #include <linux/sched.h>
  15
  16 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  17         struct task_struct *task);
  18
  19 #define activate_mm activate_mm
  20 static inline void activate_mm(struct mm_struct *prev,
  21                                struct mm_struct *next)
  22 {
  23 #ifdef CONFIG_RISCV_ISA_SUPM
  24         next->context.pmlen = 0;
  25 #endif
  26         switch_mm(prev, next, NULL);
  27 }
  28
  29 #define init_new_context init_new_context
  30 static inline int init_new_context(struct task_struct *tsk,
  31                         struct mm_struct *mm)
  32 {
  33 #ifdef CONFIG_MMU
  34         atomic_long_set(&mm->context.id, 0);
  35 #endif
  36         if (IS_ENABLED(CONFIG_RISCV_ISA_SUPM))
  37                 clear_bit(MM_CONTEXT_LOCK_PMLEN, &mm->context.flags);
  38         return 0;
  39 }
  40
  41 DECLARE_STATIC_KEY_FALSE(use_asid_allocator);
  42
  43 #ifdef CONFIG_RISCV_ISA_SUPM
  44 #define mm_untag_mask mm_untag_mask
  45 static inline unsigned long mm_untag_mask(struct mm_struct *mm)
  46 {
  47         return -1UL >> mm->context.pmlen;
  48 }
  49 #endif
  50
  51 #include <asm-generic/mmu_context.h>
  52
  53 #endif /* _ASM_RISCV_MMU_CONTEXT_H */