/* * include/asm-s390/mmu_context.h * * 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-generic/mm_hooks.h> static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm) { mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS; #ifdef CONFIG_64BIT mm->context.asce_bits |= _ASCE_TYPE_REGION3; #endif mm->context.noexec = s390_noexec; 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) #ifndef __s390x__ #define LCTL_OPCODE "lctl" #else #define LCTL_OPCODE "lctlg" #endif static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk) { pgd_t *pgd = mm->pgd; S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd); if (switch_amode) { /* Load primary space page table origin. */ pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd; S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd); asm volatile(LCTL_OPCODE" 1,1,%0\n" : : "m" (S390_lowcore.user_exec_asce) ); } else /* Load home space page table origin. */ asm volatile(LCTL_OPCODE" 13,13,%0" : : "m" (S390_lowcore.user_asce) ); set_fs(current->thread.mm_segment); } static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { cpu_set(smp_processor_id(), next->cpu_vm_mask); update_mm(next, tsk); } #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); } #endif /* __S390_MMU_CONTEXT_H */