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/*
* 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-generic/mm_hooks.h>
/*
* get a new mmu context.. S390 don't know about contexts.
*/
#define init_new_context(tsk,mm) 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;
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);
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);
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 */
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