root/include/asm-m68k/mmu_context.h

INCLUDED FROM

DEFINITIONS

1. enter_lazy_tlb
2. init_new_context
3. switch_mm_0230
4. switch_mm_0460
5. switch_mm
6. activate_mm
7. init_new_context
8. get_mmu_context
9. destroy_context
10. activate_context
11. switch_mm
12. activate_mm

#ifndef __M68K_MMU_CONTEXT_H
#define __M68K_MMU_CONTEXT_H

#include <asm-generic/mm_hooks.h>

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

#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)
{
        if (prev != next) {
                if (CPU_IS_020_OR_030)
                        switch_mm_0230(next);
                else
                        switch_mm_0460(next);
        }
}

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

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)
{
        activate_context(tsk->mm);
}

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

static inline void activate_mm(struct mm_struct *prev_mm,
                               struct mm_struct *next_mm)
{
        activate_context(next_mm);
}

#endif
#endif