Release 4.18 arch/nds32/include/asm/mmu_context.h
// 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>
static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
mm->context.id = 0;
return 0;
}
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#define destroy_context(mm) do { } while(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;
}
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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);
}
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
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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);
}
}
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#define deactivate_mm(tsk,mm) do { } while (0)
#define activate_mm(prev,next) switch_mm(prev, next, NULL)
#endif
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