1 files changed, 134 insertions, 0 deletions

diff --git a/arch/sh/mm/tlb-flush.c b/arch/sh/mm/tlb-flush.c
new file mode 100644
index 000000000000..73ec7f6084fa
--- /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);
+}