This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / mm / tlb-flush.c

diff --git a/arch/sh/mm/tlb-flush.c b/arch/sh/mm/tlb-flush.c
new file mode 100644 (file)
index 0000000..73ec7f6
--- /dev/null
+++ b/arch/sh/mm/tlb-flush.c
@@ -0,0 +1,134 @@
+/*
+ * TLB flushing operations for SH with an MMU.
+ *
+ *  Copyright (C) 1999  Niibe Yutaka
+ *  Copyright (C) 2003  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+       if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) {
+               unsigned long flags;
+               unsigned long asid;
+               unsigned long saved_asid = MMU_NO_ASID;
+
+               asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK;
+               page &= PAGE_MASK;
+
+               local_irq_save(flags);
+               if (vma->vm_mm != current->mm) {
+                       saved_asid = get_asid();
+                       set_asid(asid);
+               }
+               __flush_tlb_page(asid, page);
+               if (saved_asid != MMU_NO_ASID)
+                       set_asid(saved_asid);
+               local_irq_restore(flags);
+       }
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+                    unsigned long end)
+{
+       struct mm_struct *mm = vma->vm_mm;
+
+       if (mm->context.id != NO_CONTEXT) {
+               unsigned long flags;
+               int size;
+
+               local_irq_save(flags);
+               size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+               if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
+                       mm->context.id = NO_CONTEXT;
+                       if (mm == current->mm)
+                               activate_context(mm);
+               } else {
+                       unsigned long asid;
+                       unsigned long saved_asid = MMU_NO_ASID;
+
+                       asid = mm->context.id & MMU_CONTEXT_ASID_MASK;
+                       start &= PAGE_MASK;
+                       end += (PAGE_SIZE - 1);
+                       end &= PAGE_MASK;
+                       if (mm != current->mm) {
+                               saved_asid = get_asid();
+                               set_asid(asid);
+                       }
+                       while (start < end) {
+                               __flush_tlb_page(asid, start);
+                               start += PAGE_SIZE;
+                       }
+                       if (saved_asid != MMU_NO_ASID)
+                               set_asid(saved_asid);
+               }
+               local_irq_restore(flags);
+       }
+}
+
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
+{
+       unsigned long flags;
+       int size;
+
+       local_irq_save(flags);
+       size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
+       if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
+               flush_tlb_all();
+       } else {
+               unsigned long asid;
+               unsigned long saved_asid = get_asid();
+
+               asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK;
+               start &= PAGE_MASK;
+               end += (PAGE_SIZE - 1);
+               end &= PAGE_MASK;
+               set_asid(asid);
+               while (start < end) {
+                       __flush_tlb_page(asid, start);
+                       start += PAGE_SIZE;
+               }
+               set_asid(saved_asid);
+       }
+       local_irq_restore(flags);
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+       /* Invalidate all TLB of this process. */
+       /* Instead of invalidating each TLB, we get new MMU context. */
+       if (mm->context.id != NO_CONTEXT) {
+               unsigned long flags;
+
+               local_irq_save(flags);
+               mm->context.id = NO_CONTEXT;
+               if (mm == current->mm)
+                       activate_context(mm);
+               local_irq_restore(flags);
+       }
+}
+
+void flush_tlb_all(void)
+{
+       unsigned long flags, status;
+
+       /*
+        * Flush all the TLB.
+        *
+        * Write to the MMU control register's bit:
+        *      TF-bit for SH-3, TI-bit for SH-4.
+        *      It's same position, bit #2.
+        */
+       local_irq_save(flags);
+       status = ctrl_inl(MMUCR);
+       status |= 0x04;
+       ctrl_outl(status, MMUCR);
+       ctrl_barrier();
+       local_irq_restore(flags);
+}