| /* |
| * 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; |
| 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) ); |
| } |
| |
| static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, |
| struct task_struct *tsk) |
| { |
| if (unlikely(prev == next)) |
| return; |
| 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); |
| set_fs(current->thread.mm_segment); |
| } |
| |
| #endif /* __S390_MMU_CONTEXT_H */ |