From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/nds32/include/asm/mmu_context.h | 68 ++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 arch/nds32/include/asm/mmu_context.h (limited to 'arch/nds32/include/asm/mmu_context.h') diff --git a/arch/nds32/include/asm/mmu_context.h b/arch/nds32/include/asm/mmu_context.h new file mode 100644 index 000000000..fd7d13cef --- /dev/null +++ b/arch/nds32/include/asm/mmu_context.h @@ -0,0 +1,68 @@ +// 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 +#include +#include +#include + +static inline int +init_new_context(struct task_struct *tsk, struct mm_struct *mm) +{ + mm->context.id = 0; + return 0; +} + +#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; +} + +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 enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) +{ +} + +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); + } +} + +#define deactivate_mm(tsk,mm) do { } while (0) +#define activate_mm(prev,next) switch_mm(prev, next, NULL) + +#endif -- cgit v1.2.3