arch/csky/include/asm/mmu_context.h

   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 */