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 */ 54