diff options
Diffstat (limited to 'arch/riscv/include/asm/mmu_context.h')
-rw-r--r-- | arch/riscv/include/asm/mmu_context.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/mmu_context.h b/arch/riscv/include/asm/mmu_context.h new file mode 100644 index 000000000000..de1fc1631fc4 --- /dev/null +++ b/arch/riscv/include/asm/mmu_context.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2012 Regents of the University of California + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _ASM_RISCV_MMU_CONTEXT_H +#define _ASM_RISCV_MMU_CONTEXT_H + +#include <asm-generic/mm_hooks.h> + +#include <linux/mm.h> +#include <linux/sched.h> +#include <asm/tlbflush.h> + +static inline void enter_lazy_tlb(struct mm_struct *mm, + struct task_struct *task) +{ +} + +/* Initialize context-related info for a new mm_struct */ +static inline int init_new_context(struct task_struct *task, + struct mm_struct *mm) +{ + return 0; +} + +static inline void destroy_context(struct mm_struct *mm) +{ +} + +static inline pgd_t *current_pgdir(void) +{ + return pfn_to_virt(csr_read(sptbr) & SPTBR_PPN); +} + +static inline void set_pgdir(pgd_t *pgd) +{ + csr_write(sptbr, virt_to_pfn(pgd) | SPTBR_MODE); +} + +static inline void switch_mm(struct mm_struct *prev, + struct mm_struct *next, struct task_struct *task) +{ + if (likely(prev != next)) { + set_pgdir(next->pgd); + local_flush_tlb_all(); + } +} + +static inline void activate_mm(struct mm_struct *prev, + struct mm_struct *next) +{ + switch_mm(prev, next, NULL); +} + +static inline void deactivate_mm(struct task_struct *task, + struct mm_struct *mm) +{ +} + +#endif /* _ASM_RISCV_MMU_CONTEXT_H */ |