[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;
	mm->context.asce_bits |= _ASCE_TYPE_REGION3;
#ifdef CONFIG_PGSTE
	mm->context.alloc_pgste = page_table_allocate_pgste;
	mm->context.has_pgste = 0;
	mm->context.use_skey = 0;
#endif
	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)
{
	S390_lowcore.user_asce = mm->context.asce_bits | __pa(mm->pgd);
	if (current->thread.mm_segment.ar4)
		__ctl_load(S390_lowcore.user_asce, 7, 7);
	set_cpu_flag(CIF_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_cpu_flag(CIF_ASCE);
}

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

	S390_lowcore.user_asce = next->context.asce_bits | __pa(next->pgd);
	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);
	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;

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

		cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
		if (mm->context.flush_mm)
			__tlb_flush_mm(mm);
		preempt_enable();
	}
	set_fs(current->thread.mm_segment);
}

#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)
{
	if (oldmm->context.asce_limit < mm->context.asce_limit)
		crst_table_downgrade(mm, oldmm->context.asce_limit);
}

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

static inline void arch_unmap(struct mm_struct *mm,
			struct vm_area_struct *vma,
			unsigned long start, unsigned long end)
{
}

static inline void arch_bprm_mm_init(struct mm_struct *mm,
				     struct vm_area_struct *vma)
{
}

#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;
6252d702	22	mm->context.asce_bits \|= _ASCE_TYPE_REGION3;
0b46e0a3 MS	23	#ifdef CONFIG_PGSTE
0b46e0a3 MS	24	mm->context.alloc_pgste = page_table_allocate_pgste;
3eabaee9	25	mm->context.has_pgste = 0;
693ffc08	26	mm->context.use_skey = 0;
0b46e0a3	27	#endif
6252d702 MS	28	mm->context.asce_limit = STACK_TOP_MAX;
6252d702 MS	29	crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
6f457e1a MS	30	return 0;
6f457e1a MS	31	}
1da177e4 LT	32
	33	#define destroy_context(mm) do { } while (0)
	34
beef560b	35	static inline void set_user_asce(struct mm_struct *mm)
1da177e4	36	{
f8b13505 MS	37	S390_lowcore.user_asce = mm->context.asce_bits \| __pa(mm->pgd);
	38	if (current->thread.mm_segment.ar4)
	39	__ctl_load(S390_lowcore.user_asce, 7, 7);
d3a73acb	40	set_cpu_flag(CIF_ASCE);
1da177e4 LT	41	}
1da177e4 LT	42
beef560b	43	static inline void clear_user_asce(void)
02a8f3ab MS	44	{
02a8f3ab MS	45	S390_lowcore.user_asce = S390_lowcore.kernel_asce;
457f2180	46
beef560b	47	__ctl_load(S390_lowcore.user_asce, 1, 1);
457f2180 HC	48	__ctl_load(S390_lowcore.user_asce, 7, 7);
	49	}
	50
beef560b	51	static inline void load_kernel_asce(void)
457f2180 HC	52	{
	53	unsigned long asce;
	54
	55	__ctl_store(asce, 1, 1);
	56	if (asce != S390_lowcore.kernel_asce)
	57	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
d3a73acb	58	set_cpu_flag(CIF_ASCE);
02a8f3ab MS	59	}
02a8f3ab MS	60
1da177e4	61	static inline void switch_mm(struct mm_struct prev, struct mm_struct next,
c1821c2e	62	struct task_struct *tsk)
1da177e4	63	{
53e857f3 MS	64	int cpu = smp_processor_id();
53e857f3 MS	65
691d5264	66	S390_lowcore.user_asce = next->context.asce_bits \| __pa(next->pgd);
53e857f3 MS	67	if (prev == next)
53e857f3 MS	68	return;
1b948d6c MS	69	if (MACHINE_HAS_TLB_LC)
1b948d6c MS	70	cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
beef560b MS	71	/* Clear old ASCE by loading the kernel ASCE. */
	72	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	73	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
beef560b	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
f8b13505 MS	86	load_kernel_asce();
	87	if (mm) {
	88	preempt_disable();
	89	while (atomic_read(&mm->context.attach_count) >> 16)
	90	cpu_relax();
	91
	92	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
	93	if (mm->context.flush_mm)
	94	__tlb_flush_mm(mm);
	95	preempt_enable();
	96	}
	97	set_fs(current->thread.mm_segment);
1da177e4 LT	98	}
1da177e4 LT	99
3610cce8	100	#define enter_lazy_tlb(mm,tsk) do { } while (0)
1da177e4 LT	101	#define deactivate_mm(tsk,mm) do { } while (0)
1da177e4 LT	102
4448aaf0	103	static inline void activate_mm(struct mm_struct *prev,
1da177e4 LT	104	struct mm_struct *next)
1da177e4 LT	105	{
beef560b MS	106	switch_mm(prev, next, current);
	107	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
	108	set_user_asce(next);
1da177e4 LT	109	}
1da177e4 LT	110
0f6f281b MS	111	static inline void arch_dup_mmap(struct mm_struct *oldmm,
	112	struct mm_struct *mm)
	113	{
0f6f281b MS	114	if (oldmm->context.asce_limit < mm->context.asce_limit)
0f6f281b MS	115	crst_table_downgrade(mm, oldmm->context.asce_limit);
0f6f281b MS	116	}
	117
	118	static inline void arch_exit_mmap(struct mm_struct *mm)
	119	{
	120	}
	121
62e88b1c DH	122	static inline void arch_unmap(struct mm_struct *mm,
	123	struct vm_area_struct *vma,
	124	unsigned long start, unsigned long end)
	125	{
	126	}
	127
	128	static inline void arch_bprm_mm_init(struct mm_struct *mm,
	129	struct vm_area_struct *vma)
	130	{
	131	}
	132
c1821c2e	133	#endif /* __S390_MMU_CONTEXT_H */