[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)
{
	spin_lock_init(&mm->context.list_lock);
	INIT_LIST_HEAD(&mm->context.pgtable_list);
	INIT_LIST_HEAD(&mm->context.gmap_list);
	cpumask_clear(&mm->context.cpu_attach_mask);
	atomic_set(&mm->context.attach_count, 0);
	mm->context.flush_mm = 0;
#ifdef CONFIG_PGSTE
	mm->context.alloc_pgste = page_table_allocate_pgste;
	mm->context.has_pgste = 0;
	mm->context.use_skey = 0;
#endif
	if (mm->context.asce_limit == 0) {
		/* context created by exec, set asce limit to 4TB */
		mm->context.asce_bits = _ASCE_TABLE_LENGTH |
			_ASCE_USER_BITS | _ASCE_TYPE_REGION3;
		mm->context.asce_limit = STACK_TOP_MAX;
	} else if (mm->context.asce_limit == (1UL << 31)) {
		mm_inc_nr_pmds(mm);
	}
	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)
{
}

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	{
3446c13b MS	18	spin_lock_init(&mm->context.list_lock);
	19	INIT_LIST_HEAD(&mm->context.pgtable_list);
	20	INIT_LIST_HEAD(&mm->context.gmap_list);
1b948d6c	21	cpumask_clear(&mm->context.cpu_attach_mask);
050eef36 MS	22	atomic_set(&mm->context.attach_count, 0);
050eef36 MS	23	mm->context.flush_mm = 0;
0b46e0a3 MS	24	#ifdef CONFIG_PGSTE
0b46e0a3 MS	25	mm->context.alloc_pgste = page_table_allocate_pgste;
3eabaee9	26	mm->context.has_pgste = 0;
693ffc08	27	mm->context.use_skey = 0;
0b46e0a3	28	#endif
3446c13b MS	29	if (mm->context.asce_limit == 0) {
	30	/* context created by exec, set asce limit to 4TB */
	31	mm->context.asce_bits = _ASCE_TABLE_LENGTH \|
	32	_ASCE_USER_BITS \| _ASCE_TYPE_REGION3;
	33	mm->context.asce_limit = STACK_TOP_MAX;
	34	} else if (mm->context.asce_limit == (1UL << 31)) {
	35	mm_inc_nr_pmds(mm);
	36	}
6252d702	37	crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
6f457e1a MS	38	return 0;
6f457e1a MS	39	}
1da177e4 LT	40
	41	#define destroy_context(mm) do { } while (0)
	42
beef560b	43	static inline void set_user_asce(struct mm_struct *mm)
1da177e4	44	{
f8b13505 MS	45	S390_lowcore.user_asce = mm->context.asce_bits \| __pa(mm->pgd);
	46	if (current->thread.mm_segment.ar4)
	47	__ctl_load(S390_lowcore.user_asce, 7, 7);
d3a73acb	48	set_cpu_flag(CIF_ASCE);
1da177e4 LT	49	}
1da177e4 LT	50
beef560b	51	static inline void clear_user_asce(void)
02a8f3ab MS	52	{
02a8f3ab MS	53	S390_lowcore.user_asce = S390_lowcore.kernel_asce;
457f2180	54
beef560b	55	__ctl_load(S390_lowcore.user_asce, 1, 1);
457f2180 HC	56	__ctl_load(S390_lowcore.user_asce, 7, 7);
	57	}
	58
beef560b	59	static inline void load_kernel_asce(void)
457f2180 HC	60	{
	61	unsigned long asce;
	62
	63	__ctl_store(asce, 1, 1);
	64	if (asce != S390_lowcore.kernel_asce)
	65	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
d3a73acb	66	set_cpu_flag(CIF_ASCE);
02a8f3ab MS	67	}
02a8f3ab MS	68
1da177e4	69	static inline void switch_mm(struct mm_struct prev, struct mm_struct next,
c1821c2e	70	struct task_struct *tsk)
1da177e4	71	{
53e857f3 MS	72	int cpu = smp_processor_id();
53e857f3 MS	73
691d5264	74	S390_lowcore.user_asce = next->context.asce_bits \| __pa(next->pgd);
53e857f3 MS	75	if (prev == next)
53e857f3 MS	76	return;
1b948d6c MS	77	if (MACHINE_HAS_TLB_LC)
1b948d6c MS	78	cpumask_set_cpu(cpu, &next->context.cpu_attach_mask);
beef560b MS	79	/* Clear old ASCE by loading the kernel ASCE. */
	80	__ctl_load(S390_lowcore.kernel_asce, 1, 1);
	81	__ctl_load(S390_lowcore.kernel_asce, 7, 7);
beef560b	82	atomic_inc(&next->context.attach_count);
050eef36	83	atomic_dec(&prev->context.attach_count);
1b948d6c MS	84	if (MACHINE_HAS_TLB_LC)
1b948d6c MS	85	cpumask_clear_cpu(cpu, &prev->context.cpu_attach_mask);
53e857f3 MS	86	}
	87
	88	#define finish_arch_post_lock_switch finish_arch_post_lock_switch
	89	static inline void finish_arch_post_lock_switch(void)
	90	{
	91	struct task_struct *tsk = current;
	92	struct mm_struct *mm = tsk->mm;
	93
f8b13505 MS	94	load_kernel_asce();
	95	if (mm) {
	96	preempt_disable();
	97	while (atomic_read(&mm->context.attach_count) >> 16)
	98	cpu_relax();
	99
	100	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
	101	if (mm->context.flush_mm)
	102	__tlb_flush_mm(mm);
	103	preempt_enable();
	104	}
	105	set_fs(current->thread.mm_segment);
1da177e4 LT	106	}
1da177e4 LT	107
3610cce8	108	#define enter_lazy_tlb(mm,tsk) do { } while (0)
1da177e4 LT	109	#define deactivate_mm(tsk,mm) do { } while (0)
1da177e4 LT	110
4448aaf0	111	static inline void activate_mm(struct mm_struct *prev,
1da177e4 LT	112	struct mm_struct *next)
1da177e4 LT	113	{
beef560b MS	114	switch_mm(prev, next, current);
	115	cpumask_set_cpu(smp_processor_id(), mm_cpumask(next));
	116	set_user_asce(next);
1da177e4 LT	117	}
1da177e4 LT	118
0f6f281b MS	119	static inline void arch_dup_mmap(struct mm_struct *oldmm,
	120	struct mm_struct *mm)
	121	{
0f6f281b MS	122	}
	123
	124	static inline void arch_exit_mmap(struct mm_struct *mm)
	125	{
	126	}
	127
62e88b1c DH	128	static inline void arch_unmap(struct mm_struct *mm,
	129	struct vm_area_struct *vma,
	130	unsigned long start, unsigned long end)
	131	{
	132	}
	133
	134	static inline void arch_bprm_mm_init(struct mm_struct *mm,
	135	struct vm_area_struct *vma)
	136	{
	137	}
	138
c1821c2e	139	#endif /* __S390_MMU_CONTEXT_H */