| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | |
| 4 | #ifndef __ASM_CSKY_MMU_CONTEXT_H |
| 5 | #define __ASM_CSKY_MMU_CONTEXT_H |
| 6 | |
| 7 | #include <asm-generic/mm_hooks.h> |
| 8 | #include <asm/setup.h> |
| 9 | #include <asm/page.h> |
| 10 | #include <asm/cacheflush.h> |
| 11 | #include <asm/tlbflush.h> |
| 12 | |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <abi/ckmmu.h> |
| 16 | |
| 17 | #define TLBMISS_HANDLER_SETUP_PGD(pgd) \ |
| 18 | setup_pgd(__pa(pgd), false) |
| 19 | |
| 20 | #define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \ |
| 21 | setup_pgd(__pa(pgd), true) |
| 22 | |
| 23 | #define ASID_MASK ((1 << CONFIG_CPU_ASID_BITS) - 1) |
| 24 | #define cpu_asid(mm) (atomic64_read(&mm->context.asid) & ASID_MASK) |
| 25 | |
| 26 | #define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.asid, 0); 0; }) |
| 27 | #define activate_mm(prev,next) switch_mm(prev, next, current) |
| 28 | |
| 29 | #define destroy_context(mm) do {} while (0) |
| 30 | #define enter_lazy_tlb(mm, tsk) do {} while (0) |
| 31 | #define deactivate_mm(tsk, mm) do {} while (0) |
| 32 | |
| 33 | void check_and_switch_context(struct mm_struct *mm, unsigned int cpu); |
| 34 | |
| 35 | static inline void |
| 36 | switch_mm(struct mm_struct *prev, struct mm_struct *next, |
| 37 | struct task_struct *tsk) |
| 38 | { |
| 39 | unsigned int cpu = smp_processor_id(); |
| 40 | |
| 41 | if (prev != next) |
| 42 | check_and_switch_context(next, cpu); |
| 43 | |
| 44 | TLBMISS_HANDLER_SETUP_PGD(next->pgd); |
| 45 | write_mmu_entryhi(next->context.asid.counter); |
| 46 | } |
| 47 | #endif /* __ASM_CSKY_MMU_CONTEXT_H */ |