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