[linux-2.6-block.git] / include / asm-s390 / mmu_context.h

/*
 *  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 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* include/asm-s390/mmu_context.h
	3	*
	4	* S390 version
	5	*
	6	* Derived from "include/asm-i386/mmu_context.h"
	7	*/
	8
	9	#ifndef __S390_MMU_CONTEXT_H
	10	#define __S390_MMU_CONTEXT_H
	11
c1821c2e	12	#include <asm/pgalloc.h>
d6dd61c8 JF	13	#include <asm-generic/mm_hooks.h>
d6dd61c8 JF	14
1da177e4 LT	15	/*
	16	* get a new mmu context.. S390 don't know about contexts.
	17	*/
	18	#define init_new_context(tsk,mm) 0
	19
	20	#define destroy_context(mm) do { } while (0)
	21
c1821c2e GS	22	#ifndef __s390x__
c1821c2e GS	23	#define LCTL_OPCODE "lctl"
c1821c2e GS	24	#else
c1821c2e GS	25	#define LCTL_OPCODE "lctlg"
c1821c2e GS	26	#endif
c1821c2e GS	27
3610cce8	28	static inline void update_mm(struct mm_struct mm, struct task_struct tsk)
1da177e4	29	{
3610cce8 MS	30	pgd_t *pgd = mm->pgd;
	31	unsigned long asce_bits;
	32
	33	/* Calculate asce bits from the first pgd table entry. */
	34	asce_bits = _ASCE_TABLE_LENGTH \| _ASCE_USER_BITS;
	35	#ifdef CONFIG_64BIT
	36	asce_bits \|= _ASCE_TYPE_REGION3;
	37	#endif
	38	S390_lowcore.user_asce = asce_bits \| __pa(pgd);
	39	if (switch_amode) {
	40	/* Load primary space page table origin. */
	41	pgd_t *shadow_pgd = get_shadow_table(pgd) ? : pgd;
	42	S390_lowcore.user_exec_asce = asce_bits \| __pa(shadow_pgd);
	43	asm volatile(LCTL_OPCODE" 1,1,%0\n"
	44	: : "m" (S390_lowcore.user_exec_asce) );
	45	} else
	46	/* Load home space page table origin. */
	47	asm volatile(LCTL_OPCODE" 13,13,%0"
	48	: : "m" (S390_lowcore.user_asce) );
1da177e4 LT	49	}
	50
	51	static inline void switch_mm(struct mm_struct prev, struct mm_struct next,
c1821c2e	52	struct task_struct *tsk)
1da177e4	53	{
3610cce8 MS	54	if (unlikely(prev == next))
3610cce8 MS	55	return;
1da177e4	56	cpu_set(smp_processor_id(), next->cpu_vm_mask);
3610cce8	57	update_mm(next, tsk);
1da177e4 LT	58	}
1da177e4 LT	59
3610cce8	60	#define enter_lazy_tlb(mm,tsk) do { } while (0)
1da177e4 LT	61	#define deactivate_mm(tsk,mm) do { } while (0)
1da177e4 LT	62
4448aaf0	63	static inline void activate_mm(struct mm_struct *prev,
1da177e4 LT	64	struct mm_struct *next)
	65	{
	66	switch_mm(prev, next, current);
	67	set_fs(current->thread.mm_segment);
	68	}
	69
c1821c2e	70	#endif /* __S390_MMU_CONTEXT_H */