#define __S390_MMU_CONTEXT_H
#include <asm/pgalloc.h>
+#include <asm/uaccess.h>
#include <asm-generic/mm_hooks.h>
-/*
- * get a new mmu context.. S390 don't know about contexts.
- */
-#define init_new_context(tsk,mm) 0
+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
+ if (current->mm->context.pgstes) {
+ mm->context.noexec = 0;
+ mm->context.pgstes = 1;
+ } else {
+ mm->context.noexec = s390_noexec;
+ mm->context.pgstes = 0;
+ }
+ 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)
static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
{
pgd_t *pgd = mm->pgd;
- unsigned long asce_bits;
- /* Calculate asce bits from the first pgd table entry. */
- asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
-#ifdef CONFIG_64BIT
- asce_bits |= _ASCE_TYPE_REGION3;
-#endif
- S390_lowcore.user_asce = asce_bits | __pa(pgd);
+ S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
if (switch_amode) {
/* Load primary space page table origin. */
- pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
- S390_lowcore.user_exec_asce = asce_bits | __pa(shadow_pgd);
+ 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)
{
- if (unlikely(prev == next))
- return;
cpu_set(smp_processor_id(), next->cpu_vm_mask);
update_mm(next, tsk);
}
struct mm_struct *next)
{
switch_mm(prev, next, current);
- set_fs(current->thread.mm_segment);
}
#endif /* __S390_MMU_CONTEXT_H */