/* * S390 version * * Derived from "include/asm-i386/mmu_context.h" */ #ifndef __S390_MMU_CONTEXT_H #define __S390_MMU_CONTEXT_H #include <asm/pgalloc.h> #include <asm/uaccess.h> #include <asm/tlbflush.h> #include <asm/ctl_reg.h> static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { cpumask_clear(&mm->context.cpu_attach_mask); atomic_set(&mm->context.attach_count, 0); mm->context.flush_mm = 0; mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; mm->context.asce_bits |= _ASCE_TYPE_REGION3; #ifdef CONFIG_PGSTE mm->context.alloc_pgste = page_table_allocate_pgste; mm->context.has_pgste = 0; mm->context.use_skey = 0; #endif mm->context.asce_limit = STACK_TOP_MAX; crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm)); return 0; } #define destroy_context(mm) do { } while (0) static inline void set_user_asce(struct mm_struct *mm) { S390_lowcore.user_asce = mm->context.asce_bits | __pa(mm->pgd); if (current->thread.mm_segment.ar4) __ctl_load(S390_lowcore.user_asce, 7, 7); set_cpu_flag(CIF_ASCE); } static inline void clear_user_asce(void) { S390_lowcore.user_asce = S390_lowcore.kernel_asce; __ctl_load(S390_lowcore.user_asce, 1, 1); __ctl_load(S390_lowcore.user_asce, 7, 7); } static inline void load_kernel_asce(void) { unsigned long asce; __ctl_store(asce, 1, 1); if (asce != S390_lowcore.kernel_asce) __ctl_load(S390_lowcore.kernel_asce, 1, 1); set_cpu_flag(CIF_ASCE); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { int cpu = smp_processor_id(); S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd); if (prev == next) return; if (MACHINE_HAS_TLB_LC) cpumask_set_cpu(cpu, &next->context.cpu_attach_mask); /* Clear old ASCE by loading the kernel ASCE. */ __ctl_load(S390_lowcore.kernel_asce, 1, 1); __ctl_load(S390_lowcore.kernel_asce, 7, 7); atomic_inc(&next->context.attach_count); atomic_dec(&prev->context.attach_count); if (MACHINE_HAS_TLB_LC) cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask); } #define finish_arch_post_lock_switch finish_arch_post_lock_switch static inline void finish_arch_post_lock_switch(void) { struct task_struct *tsk = current; struct mm_struct *mm = tsk->mm; load_kernel_asce(); if (mm) { preempt_disable(); while (atomic_read(&mm->context.attach_count) >> 16) cpu_relax(); cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); if (mm->context.flush_mm) __tlb_flush_mm(mm); preempt_enable(); } set_fs(current->thread.mm_segment); } #define enter_lazy_tlb(mm,tsk) do { } while (0) #define deactivate_mm(tsk,mm) do { } while (0) static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) { switch_mm(prev, next, current); cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); set_user_asce(next); } static inline void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) { if (oldmm->context.asce_limit < mm->context.asce_limit) crst_table_downgrade(mm, oldmm->context.asce_limit); } static inline void arch_exit_mmap(struct mm_struct *mm) { } static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long start, unsigned long end) { } static inline void arch_bprm_mm_init(struct mm_struct *mm, struct vm_area_struct *vma) { } #endif /* __S390_MMU_CONTEXT_H */