[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / arch / parisc / include / asm / mmu_context.h

#ifndef __PARISC_MMU_CONTEXT_H
#define __PARISC_MMU_CONTEXT_H

#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/atomic.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm-generic/mm_hooks.h>

static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}

/* on PA-RISC, we actually have enough contexts to justify an allocator
 * for them.  prumpf */

extern unsigned long alloc_sid(void);
extern void free_sid(unsigned long);

static inline int
init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	BUG_ON(atomic_read(&mm->mm_users) != 1);

	mm->context = alloc_sid();
	return 0;
}

static inline void
destroy_context(struct mm_struct *mm)
{
	free_sid(mm->context);
	mm->context = 0;
}

static inline unsigned long __space_to_prot(mm_context_t context)
{
#if SPACEID_SHIFT == 0
	return context << 1;
#else
	return context >> (SPACEID_SHIFT - 1);
#endif
}

static inline void load_context(mm_context_t context)
{
	mtsp(context, 3);
	mtctl(__space_to_prot(context), 8);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
{

	if (prev != next) {
		mtctl(__pa(next->pgd), 25);
		load_context(next->context);
	}
}

#define deactivate_mm(tsk,mm)	do { } while (0)

static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
{
	/*
	 * Activate_mm is our one chance to allocate a space id
	 * for a new mm created in the exec path. There's also
	 * some lazy tlb stuff, which is currently dead code, but
	 * we only allocate a space id if one hasn't been allocated
	 * already, so we should be OK.
	 */

	BUG_ON(next == &init_mm); /* Should never happen */

	if (next->context == 0)
	    next->context = alloc_sid();

	switch_mm(prev,next,current);
}
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef __PARISC_MMU_CONTEXT_H
	2	#define __PARISC_MMU_CONTEXT_H
	3
	4	#include <linux/mm.h>
e8edc6e0	5	#include <linux/sched.h>
60063497	6	#include <linux/atomic.h>
1da177e4 LT	7	#include <asm/pgalloc.h>
1da177e4 LT	8	#include <asm/pgtable.h>
d6dd61c8	9	#include <asm-generic/mm_hooks.h>
1da177e4 LT	10
	11	static inline void enter_lazy_tlb(struct mm_struct mm, struct task_struct tsk)
	12	{
	13	}
	14
	15	/* on PA-RISC, we actually have enough contexts to justify an allocator
	16	* for them. prumpf */
	17
	18	extern unsigned long alloc_sid(void);
	19	extern void free_sid(unsigned long);
	20
	21	static inline int
	22	init_new_context(struct task_struct tsk, struct mm_struct mm)
	23	{
	24	BUG_ON(atomic_read(&mm->mm_users) != 1);
	25
	26	mm->context = alloc_sid();
	27	return 0;
	28	}
	29
	30	static inline void
	31	destroy_context(struct mm_struct *mm)
	32	{
	33	free_sid(mm->context);
	34	mm->context = 0;
	35	}
	36
70da2d96	37	static inline unsigned long __space_to_prot(mm_context_t context)
1da177e4	38	{
1da177e4	39	#if SPACEID_SHIFT == 0
a60715f5	40	return context << 1;
1da177e4	41	#else
a60715f5	42	return context >> (SPACEID_SHIFT - 1);
1da177e4 LT	43	#endif
	44	}
	45
a60715f5 KM	46	static inline void load_context(mm_context_t context)
	47	{
	48	mtsp(context, 3);
	49	mtctl(__space_to_prot(context), 8);
	50	}
	51
1da177e4 LT	52	static inline void switch_mm(struct mm_struct prev, struct mm_struct next, struct task_struct *tsk)
	53	{
	54
	55	if (prev != next) {
	56	mtctl(__pa(next->pgd), 25);
	57	load_context(next->context);
	58	}
	59	}
	60
	61	#define deactivate_mm(tsk,mm) do { } while (0)
	62
	63	static inline void activate_mm(struct mm_struct prev, struct mm_struct next)
	64	{
	65	/*
	66	* Activate_mm is our one chance to allocate a space id
	67	* for a new mm created in the exec path. There's also
	68	* some lazy tlb stuff, which is currently dead code, but
	69	* we only allocate a space id if one hasn't been allocated
	70	* already, so we should be OK.
	71	*/
	72
	73	BUG_ON(next == &init_mm); /* Should never happen */
	74
	75	if (next->context == 0)
	76	next->context = alloc_sid();
	77
	78	switch_mm(prev,next,current);
	79	}
	80	#endif