[linux-2.6-block.git] / arch / s390 / include / asm / 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/uaccess.h>
#include <asm/tlbflush.h>
#include <asm/ctl_reg.h>

static inline int init_new_context(struct task_struct *tsk,
				   struct mm_struct *mm)
{
	cpumask_clear(&mm->context.cpu_attach_mask);
	atomic_set(&mm->context.attach_count, 0);
	mm->context.flush_mm = 0;
	mm->context.asce_bits = _ASCE_TABLE_LENGTH | _ASCE_USER_BITS;
#ifdef CONFIG_64BIT
	mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#endif
	mm->context.has_pgste = 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 set_user_asce(struct mm_struct *mm)
{
	pgd_t *pgd = mm->pgd;

	S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
	set_fs(current->thread.mm_segment);
	set_thread_flag(TIF_ASCE);
}

static inline void clear_user_asce(void)
{
	S390_lowcore.user_asce = S390_lowcore.kernel_asce;

	__ctl_load(S390_lowcore.user_asce, 1, 1);
	__ctl_load(S390_lowcore.user_asce, 7, 7);
}

static inline void load_kernel_asce(void)
{
	unsigned long asce;

	__ctl_store(asce, 1, 1);
	if (asce != S390_lowcore.kernel_asce)
		__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	set_thread_flag(TIF_ASCE);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
			     struct task_struct *tsk)
{
	int cpu = smp_processor_id();

	if (prev == next)
		return;
	if (MACHINE_HAS_TLB_LC)
		cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
	/* Clear old ASCE by loading the kernel ASCE. */
	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	/* Delay loading of the new ASCE to control registers CR1 & CR7 */
	set_thread_flag(TIF_ASCE);
	atomic_inc(&next->context.attach_count);
	atomic_dec(&prev->context.attach_count);
	if (MACHINE_HAS_TLB_LC)
		cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
}

#define finish_arch_post_lock_switch finish_arch_post_lock_switch
static inline void finish_arch_post_lock_switch(void)
{
	struct task_struct *tsk = current;
	struct mm_struct *mm = tsk->mm;

	if (!mm)
		return;
	preempt_disable();
	while (atomic_read(&mm->context.attach_count) >> 16)
		cpu_relax();

	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
	set_user_asce(mm);
	if (mm->context.flush_mm)
		__tlb_flush_mm(mm);
	preempt_enable();
}

#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);
	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
	set_user_asce(next);
}

static inline void arch_dup_mmap(struct mm_struct *oldmm,
				 struct mm_struct *mm)
{
#ifdef CONFIG_64BIT
	if (oldmm->context.asce_limit < mm->context.asce_limit)
		crst_table_downgrade(mm, oldmm->context.asce_limit);
#endif
}

static inline void arch_exit_mmap(struct mm_struct *mm)
{
}

#endif /* __S390_MMU_CONTEXT_H */
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* S390 version
	3	*
	4	* Derived from "include/asm-i386/mmu_context.h"
	5	*/
	6
	7	#ifndef __S390_MMU_CONTEXT_H
	8	#define __S390_MMU_CONTEXT_H
	9
c1821c2e	10	#include <asm/pgalloc.h>
146e4b3c	11	#include <asm/uaccess.h>
050eef36	12	#include <asm/tlbflush.h>
a0616cde	13	#include <asm/ctl_reg.h>
d6dd61c8	14
6f457e1a MS	15	static inline int init_new_context(struct task_struct *tsk,
	16	struct mm_struct *mm)
	17	{
1b948d6c	18	cpumask_clear(&mm->context.cpu_attach_mask);
050eef36 MS	19	atomic_set(&mm->context.attach_count, 0);
050eef36 MS	20	mm->context.flush_mm = 0;
146e4b3c	21	mm->context.asce_bits = _ASCE_TABLE_LENGTH \| _ASCE_USER_BITS;
6f457e1a	22	#ifdef CONFIG_64BIT
6252d702	23	mm->context.asce_bits \|= _ASCE_TYPE_REGION3;
6f457e1a	24	#endif
3eabaee9	25	mm->context.has_pgste = 0;
6252d702 MS	26	mm->context.asce_limit = STACK_TOP_MAX;
6252d702 MS	27	crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
6f457e1a MS	28	return 0;
6f457e1a MS	29	}
1da177e4 LT	30
	31	#define destroy_context(mm) do { } while (0)
	32
beef560b	33	static inline void set_user_asce(struct mm_struct *mm)
1da177e4	34	{
146e4b3c MS	35	pgd_t *pgd = mm->pgd;
	36
	37	S390_lowcore.user_asce = mm->context.asce_bits \| __pa(pgd);
6252d702	38	set_fs(current->thread.mm_segment);
beef560b	39	set_thread_flag(TIF_ASCE);
1da177e4 LT	40	}
1da177e4 LT	41
beef560b	42	static inline void clear_user_asce(void)
02a8f3ab MS	43	{
02a8f3ab MS	44	S390_lowcore.user_asce = S390_lowcore.kernel_asce;
457f2180	45
beef560b	46	__ctl_load(S390_lowcore.user_asce, 1, 1);
457f2180 HC	47	__ctl_load(S390_lowcore.user_asce, 7, 7);
	48	}
	49
beef560b	50	static inline void load_kernel_asce(void)
457f2180 HC	51	{
	52	unsigned long asce;
	53
	54	__ctl_store(asce, 1, 1);
	55	if (asce != S390_lowcore.kernel_asce)
	56	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
beef560b	57	set_thread_flag(TIF_ASCE);
02a8f3ab MS	58	}
02a8f3ab MS	59
1da177e4	60	static inline void switch_mm(struct mm_struct prev, struct mm_struct next,
c1821c2e	61	struct task_struct *tsk)
1da177e4	62	{
53e857f3 MS	63	int cpu = smp_processor_id();
	64
	65	if (prev == next)
	66	return;
1b948d6c MS	67	if (MACHINE_HAS_TLB_LC)
1b948d6c MS	68	cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
beef560b MS	69	/* Clear old ASCE by loading the kernel ASCE. */
	70	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	71	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
	72	/* Delay loading of the new ASCE to control registers CR1 & CR7 */
	73	set_thread_flag(TIF_ASCE);
	74	atomic_inc(&next->context.attach_count);
050eef36	75	atomic_dec(&prev->context.attach_count);
1b948d6c MS	76	if (MACHINE_HAS_TLB_LC)
1b948d6c MS	77	cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
53e857f3 MS	78	}
	79
	80	#define finish_arch_post_lock_switch finish_arch_post_lock_switch
	81	static inline void finish_arch_post_lock_switch(void)
	82	{
	83	struct task_struct *tsk = current;
	84	struct mm_struct *mm = tsk->mm;
	85
beef560b	86	if (!mm)
53e857f3 MS	87	return;
53e857f3 MS	88	preempt_disable();
53e857f3 MS	89	while (atomic_read(&mm->context.attach_count) >> 16)
	90	cpu_relax();
	91
	92	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
beef560b	93	set_user_asce(mm);
53e857f3 MS	94	if (mm->context.flush_mm)
	95	__tlb_flush_mm(mm);
	96	preempt_enable();
1da177e4 LT	97	}
1da177e4 LT	98
3610cce8	99	#define enter_lazy_tlb(mm,tsk) do { } while (0)
1da177e4 LT	100	#define deactivate_mm(tsk,mm) do { } while (0)
1da177e4 LT	101
4448aaf0	102	static inline void activate_mm(struct mm_struct *prev,
1da177e4 LT	103	struct mm_struct *next)
1da177e4 LT	104	{
beef560b MS	105	switch_mm(prev, next, current);
	106	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
	107	set_user_asce(next);
1da177e4 LT	108	}
1da177e4 LT	109
0f6f281b MS	110	static inline void arch_dup_mmap(struct mm_struct *oldmm,
	111	struct mm_struct *mm)
	112	{
	113	#ifdef CONFIG_64BIT
	114	if (oldmm->context.asce_limit < mm->context.asce_limit)
	115	crst_table_downgrade(mm, oldmm->context.asce_limit);
	116	#endif
	117	}
	118
	119	static inline void arch_exit_mmap(struct mm_struct *mm)
	120	{
	121	}
	122
c1821c2e	123	#endif /* __S390_MMU_CONTEXT_H */