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 <linux/uaccess.h>
12 #include <linux/mm_types.h>
13 #include <asm/tlbflush.h>
14 #include <asm/ctl_reg.h>
16 static inline int init_new_context(struct task_struct *tsk,
19 spin_lock_init(&mm->context.pgtable_lock);
20 INIT_LIST_HEAD(&mm->context.pgtable_list);
21 spin_lock_init(&mm->context.gmap_lock);
22 INIT_LIST_HEAD(&mm->context.gmap_list);
23 cpumask_clear(&mm->context.cpu_attach_mask);
24 atomic_set(&mm->context.flush_count, 0);
25 mm->context.gmap_asce = 0;
26 mm->context.flush_mm = 0;
28 mm->context.alloc_pgste = page_table_allocate_pgste;
29 mm->context.has_pgste = 0;
30 mm->context.use_skey = 0;
31 mm->context.use_cmma = 0;
33 switch (mm->context.asce_limit) {
36 * forked 3-level task, fall through to set new asce with new
40 /* context created by exec, set asce limit to 4TB */
41 mm->context.asce_limit = STACK_TOP_MAX;
42 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
43 _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
46 /* forked 4-level task, set new asce with new mm->pgd */
47 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
48 _ASCE_USER_BITS | _ASCE_TYPE_REGION2;
51 /* forked 2-level compat task, set new asce with new mm->pgd */
52 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
53 _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
54 /* pgd_alloc() did not increase mm->nr_pmds */
57 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
61 #define destroy_context(mm) do { } while (0)
63 static inline void set_user_asce(struct mm_struct *mm)
65 S390_lowcore.user_asce = mm->context.asce;
66 if (current->thread.mm_segment.ar4)
67 __ctl_load(S390_lowcore.user_asce, 7, 7);
68 set_cpu_flag(CIF_ASCE_PRIMARY);
71 static inline void clear_user_asce(void)
73 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
75 __ctl_load(S390_lowcore.user_asce, 1, 1);
76 __ctl_load(S390_lowcore.user_asce, 7, 7);
79 static inline void load_kernel_asce(void)
83 __ctl_store(asce, 1, 1);
84 if (asce != S390_lowcore.kernel_asce)
85 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
86 set_cpu_flag(CIF_ASCE_PRIMARY);
89 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
90 struct task_struct *tsk)
92 int cpu = smp_processor_id();
94 S390_lowcore.user_asce = next->context.asce;
97 cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
98 cpumask_set_cpu(cpu, mm_cpumask(next));
99 /* Clear old ASCE by loading the kernel ASCE. */
100 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
101 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
102 cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
105 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
106 static inline void finish_arch_post_lock_switch(void)
108 struct task_struct *tsk = current;
109 struct mm_struct *mm = tsk->mm;
114 while (atomic_read(&mm->context.flush_count))
117 if (mm->context.flush_mm)
121 set_fs(current->thread.mm_segment);
124 #define enter_lazy_tlb(mm,tsk) do { } while (0)
125 #define deactivate_mm(tsk,mm) do { } while (0)
127 static inline void activate_mm(struct mm_struct *prev,
128 struct mm_struct *next)
130 switch_mm(prev, next, current);
134 static inline void arch_dup_mmap(struct mm_struct *oldmm,
135 struct mm_struct *mm)
139 static inline void arch_exit_mmap(struct mm_struct *mm)
143 static inline void arch_unmap(struct mm_struct *mm,
144 struct vm_area_struct *vma,
145 unsigned long start, unsigned long end)
149 static inline void arch_bprm_mm_init(struct mm_struct *mm,
150 struct vm_area_struct *vma)
154 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
155 bool write, bool execute, bool foreign)
157 /* by default, allow everything */
160 #endif /* __S390_MMU_CONTEXT_H */