1 files changed, 154 insertions, 0 deletions

diff --git a/include/asm-m68k/mmu_context.h b/include/asm-m68k/mmu_context.h
new file mode 100644
index 000000000000..661191d15c81
--- /dev/null
+++ b/include/asm-m68k/mmu_context.h
@@ -0,0 +1,154 @@
+#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)
+{
+}
+
+#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