Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6

[pandora-kernel.git] / arch / m68k / include / asm / mmu_context.h

diff --git a/arch/m68k/include/asm/mmu_context.h b/arch/m68k/include/asm/mmu_context.h
index b440928..7d4341e 100644 (file)
--- a/arch/m68k/include/asm/mmu_context.h
+++ b/arch/m68k/include/asm/mmu_context.h
@@ -1,5 +1,175 @@
-#ifdef __uClinux__
-#include "mmu_context_no.h"
+#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)
+{
+}
+
+#ifdef CONFIG_MMU
+#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
-#include "mmu_context_mm.h"
+               "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
+#else /* !CONFIG_MMU */
+
+static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+       return 0;
+}
+
+
+static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
+{
+}
+
+#define destroy_context(mm)    do { } while (0)
+#define deactivate_mm(tsk,mm)  do { } while (0)
+
+static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
+{
+}
+
+#endif /* CONFIG_MMU */
+#endif /* __M68K_MMU_CONTEXT_H */