/* SPDX-License-Identifier: GPL-2.0 */ // Copyright (C) 2005-2017 Andes Technology Corporation #ifndef __ASM_NDS32_MMU_CONTEXT_H #define __ASM_NDS32_MMU_CONTEXT_H #include <linux/spinlock.h> #include <asm/tlbflush.h> #include <asm/proc-fns.h> #include <asm-generic/mm_hooks.h> #define init_new_context init_new_context static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { mm->context.id = 0; return 0; } #define CID_BITS 9 extern spinlock_t cid_lock; extern unsigned int cpu_last_cid; static inline void __new_context(struct mm_struct *mm) { unsigned int cid; unsigned long flags; spin_lock_irqsave(&cid_lock, flags); cid = cpu_last_cid; cpu_last_cid += 1 << TLB_MISC_offCID; if (cpu_last_cid == 0) cpu_last_cid = 1 << TLB_MISC_offCID << CID_BITS; if ((cid & TLB_MISC_mskCID) == 0) flush_tlb_all(); spin_unlock_irqrestore(&cid_lock, flags); mm->context.id = cid; } static inline void check_context(struct mm_struct *mm) { if (unlikely ((mm->context.id ^ cpu_last_cid) >> TLB_MISC_offCID >> CID_BITS)) __new_context(mm); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned int cpu = smp_processor_id(); if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) { check_context(next); cpu_switch_mm(next); } } #include <asm-generic/mmu_context.h> #endif