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;
32 switch (mm->context.asce_limit) {
35 * forked 3-level task, fall through to set new asce with new
39 /* context created by exec, set asce limit to 4TB */
40 mm->context.asce_limit = STACK_TOP_MAX;
41 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
42 _ASCE_USER_BITS | _ASCE_TYPE_REGION3;
45 /* forked 4-level task, set new asce with new mm->pgd */
46 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
47 _ASCE_USER_BITS | _ASCE_TYPE_REGION2;
50 /* forked 2-level compat task, set new asce with new mm->pgd */
51 mm->context.asce = __pa(mm->pgd) | _ASCE_TABLE_LENGTH |
52 _ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
53 /* pgd_alloc() did not increase mm->nr_pmds */
56 crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
60 #define destroy_context(mm) do { } while (0)
62 static inline void set_user_asce(struct mm_struct *mm)
64 S390_lowcore.user_asce = mm->context.asce;
65 if (current->thread.mm_segment.ar4)
66 __ctl_load(S390_lowcore.user_asce, 7, 7);
67 set_cpu_flag(CIF_ASCE_PRIMARY);
70 static inline void clear_user_asce(void)
72 S390_lowcore.user_asce = S390_lowcore.kernel_asce;
74 __ctl_load(S390_lowcore.user_asce, 1, 1);
75 __ctl_load(S390_lowcore.user_asce, 7, 7);
78 static inline void load_kernel_asce(void)
82 __ctl_store(asce, 1, 1);
83 if (asce != S390_lowcore.kernel_asce)
84 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
85 set_cpu_flag(CIF_ASCE_PRIMARY);
88 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
89 struct task_struct *tsk)
91 int cpu = smp_processor_id();
93 S390_lowcore.user_asce = next->context.asce;
96 cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
97 cpumask_set_cpu(cpu, mm_cpumask(next));
98 /* Clear old ASCE by loading the kernel ASCE. */
99 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
100 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
101 cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
104 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
105 static inline void finish_arch_post_lock_switch(void)
107 struct task_struct *tsk = current;
108 struct mm_struct *mm = tsk->mm;
113 while (atomic_read(&mm->context.flush_count))
116 if (mm->context.flush_mm)
120 set_fs(current->thread.mm_segment);
123 #define enter_lazy_tlb(mm,tsk) do { } while (0)
124 #define deactivate_mm(tsk,mm) do { } while (0)
126 static inline void activate_mm(struct mm_struct *prev,
127 struct mm_struct *next)
129 switch_mm(prev, next, current);
133 static inline void arch_dup_mmap(struct mm_struct *oldmm,
134 struct mm_struct *mm)
138 static inline void arch_exit_mmap(struct mm_struct *mm)
142 static inline void arch_unmap(struct mm_struct *mm,
143 struct vm_area_struct *vma,
144 unsigned long start, unsigned long end)
148 static inline void arch_bprm_mm_init(struct mm_struct *mm,
149 struct vm_area_struct *vma)
153 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
154 bool write, bool execute, bool foreign)
156 /* by default, allow everything */
160 static inline bool arch_pte_access_permitted(pte_t pte, bool write)
162 /* by default, allow everything */
165 #endif /* __S390_MMU_CONTEXT_H */