4 * Derived from "include/asm-i386/mmu_context.h"
7 #ifndef __S390_MMU_CONTEXT_H
8 #define __S390_MMU_CONTEXT_H
10 #include <asm/pgalloc.h>
11 #include <asm/uaccess.h>
12 #include <asm/tlbflush.h>
13 #include <asm/ctl_reg.h>
15 static inline int init_new_context(struct task_struct *tsk,
18 cpumask_clear(&mm->context.cpu_attach_mask);
19 atomic_set(&mm->context.attach_count, 0);
20 mm->context.flush_mm = 0;
21 mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
22 mm->context.asce_bits |= _ASCE_TYPE_REGION3;
23 mm->context.has_pgste = 0;
24 mm->context.use_skey = 0;
25 mm->context.asce_limit = STACK_TOP_MAX;
26 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
30 #define destroy_context(mm) do { } while (0)
32 static inline void set_user_asce(struct mm_struct *mm)
34 S390_lowcore.user_asce = mm->context.asce_bits | __pa(mm->pgd);
35 if (current->thread.mm_segment.ar4)
36 __ctl_load(S390_lowcore.user_asce, 7, 7);
37 set_cpu_flag(CIF_ASCE);
40 static inline void clear_user_asce(void)
42 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
44 __ctl_load(S390_lowcore.user_asce, 1, 1);
45 __ctl_load(S390_lowcore.user_asce, 7, 7);
48 static inline void load_kernel_asce(void)
52 __ctl_store(asce, 1, 1);
53 if (asce != S390_lowcore.kernel_asce)
54 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
55 set_cpu_flag(CIF_ASCE);
58 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
59 struct task_struct *tsk)
61 int cpu = smp_processor_id();
63 S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd);
66 if (MACHINE_HAS_TLB_LC)
67 cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
68 /* Clear old ASCE by loading the kernel ASCE. */
69 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
70 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
71 atomic_inc(&next->context.attach_count);
72 atomic_dec(&prev->context.attach_count);
73 if (MACHINE_HAS_TLB_LC)
74 cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
77 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
78 static inline void finish_arch_post_lock_switch(void)
80 struct task_struct *tsk = current;
81 struct mm_struct *mm = tsk->mm;
86 while (atomic_read(&mm->context.attach_count) >> 16)
89 cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
90 if (mm->context.flush_mm)
94 set_fs(current->thread.mm_segment);
97 #define enter_lazy_tlb(mm,tsk) do { } while (0)
98 #define deactivate_mm(tsk,mm) do { } while (0)
100 static inline void activate_mm(struct mm_struct *prev,
101 struct mm_struct *next)
103 switch_mm(prev, next, current);
104 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
108 static inline void arch_dup_mmap(struct mm_struct *oldmm,
109 struct mm_struct *mm)
111 if (oldmm->context.asce_limit < mm->context.asce_limit)
112 crst_table_downgrade(mm, oldmm->context.asce_limit);
115 static inline void arch_exit_mmap(struct mm_struct *mm)
119 static inline void arch_unmap(struct mm_struct *mm,
120 struct vm_area_struct *vma,
121 unsigned long start, unsigned long end)
125 static inline void arch_bprm_mm_init(struct mm_struct *mm,
126 struct vm_area_struct *vma)
130 #endif /* __S390_MMU_CONTEXT_H */