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#ifndef __M68K_MMU_CONTEXT_H

#define __M68K_MMU_CONTEXT_H

#include <linux/config.h>

static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk, unsigned cpu)

{

}

#ifndef CONFIG_SUN3

#include <asm/setup.h>

#include <asm/page.h>

#include <asm/pgalloc.h>

static inline int init_new_context(struct task_struct *tsk,

                                   struct mm_struct *mm)

{

        mm->context = virt_to_phys(mm->pgd);

        return 0;

}

#define destroy_context(mm)             do { } while(0)

static inline void switch_mm_0230(struct mm_struct *mm)

{

        unsigned long crp[2] = {

                0x80000000 | _PAGE_TABLE, mm->context

        };

        unsigned long tmp;

        asm volatile (".chip 68030");

        /* flush MC68030/MC68020 caches (they are virtually addressed) */

        asm volatile (

                "movec %%cacr,%0;"

                "orw %1,%0; "

                "movec %0,%%cacr"

                : "=d" (tmp) : "di" (FLUSH_I_AND_D));

        /* Switch the root pointer. For a 030-only kernel,

         * avoid flushing the whole ATC, we only need to

         * flush the user entries. The 68851 does this by

         * itself. Avoid a runtime check here.

         */

        asm volatile (

#ifdef CPU_M68030_ONLY

                "pmovefd %0,%%crp; "

                "pflush #0,#4"

#else

                "pmove %0,%%crp"

#endif

                : : "m" (crp[0]));

        asm volatile (".chip 68k");

}

static inline void switch_mm_0460(struct mm_struct *mm)

{

        asm volatile (".chip 68040");

        /* flush address translation cache (user entries) */

        asm volatile ("pflushan");

        /* switch the root pointer */

        asm volatile ("movec %0,%%urp" : : "r" (mm->context));

        if (CPU_IS_060) {

                unsigned long tmp;

                /* clear user entries in the branch cache */

                asm volatile (

                        "movec %%cacr,%0; "

                        "orl %1,%0; "

                        "movec %0,%%cacr"

                        : "=d" (tmp): "di" (0x00200000));

        }

        asm volatile (".chip 68k");

}

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

{

        if (prev != next) {

                if (CPU_IS_020_OR_030)

                        switch_mm_0230(next);

                else

                        switch_mm_0460(next);

        }

}

static inline void activate_mm(struct mm_struct *prev_mm,

                               struct mm_struct *next_mm)

{

        next_mm->context = virt_to_phys(next_mm->pgd);

        if (CPU_IS_020_OR_030)

                switch_mm_0230(next_mm);

        else

                switch_mm_0460(next_mm);

}

#else  /* CONFIG_SUN3 */

#include <asm/sun3mmu.h>

#include <linux/sched.h>

extern unsigned long get_free_context(struct mm_struct *mm);

extern void clear_context(unsigned long context);

/* set the context for a new task to unmapped */

static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)

{

        mm->context = SUN3_INVALID_CONTEXT;

        return 0;

}

/* find the context given to this process, and if it hasn't already

   got one, go get one for it. */

static inline void get_mmu_context(struct mm_struct *mm)

{

        if(mm->context == SUN3_INVALID_CONTEXT)

                mm->context = get_free_context(mm);

}

/* flush context if allocated... */

static inline void destroy_context(struct mm_struct *mm)

{

        if(mm->context != SUN3_INVALID_CONTEXT)

                clear_context(mm->context);

}

static inline void activate_context(struct mm_struct *mm)

{

        get_mmu_context(mm);

        sun3_put_context(mm->context);

}

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

{

        activate_context(tsk->mm);

}

static inline void activate_mm(struct mm_struct *prev_mm,

                               struct mm_struct *next_mm)

{

        activate_context(next_mm);

}

#endif 

#endif