1 files changed, 80 insertions, 0 deletions

diff --git a/arch/mn10300/mm/mmu-context.c b/arch/mn10300/mm/mmu-context.c
new file mode 100644
index 000000000000..31c9d27a75ae
--- /dev/null
+++ b/arch/mn10300/mm/mmu-context.c
@@ -0,0 +1,80 @@
+/* MN10300 MMU context allocation and management
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+
+/*
+ * list of the MMU contexts last allocated on each CPU
+ */
+unsigned long mmu_context_cache[NR_CPUS] = {
+        [0 ... NR_CPUS - 1] = MMU_CONTEXT_FIRST_VERSION * 2 - 1,
+};
+
+/*
+ * flush the specified TLB entry
+ */
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+        unsigned long pteu, cnx, flags;
+
+        addr &= PAGE_MASK;
+
+        /* make sure the context doesn't migrate and defend against
+         * interference from vmalloc'd regions */
+        local_irq_save(flags);
+
+        cnx = mm_context(vma->vm_mm);
+
+        if (cnx != MMU_NO_CONTEXT) {
+                pteu = addr | (cnx & 0x000000ffUL);
+                IPTEU = pteu;
+                DPTEU = pteu;
+                if (IPTEL & xPTEL_V)
+                        IPTEL = 0;
+                if (DPTEL & xPTEL_V)
+                        DPTEL = 0;
+        }
+
+        local_irq_restore(flags);
+}
+
+/*
+ * preemptively set a TLB entry
+ */
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
+{
+        unsigned long pteu, ptel, cnx, flags;
+
+        addr &= PAGE_MASK;
+        ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2);
+
+        /* make sure the context doesn't migrate and defend against
+         * interference from vmalloc'd regions */
+        local_irq_save(flags);
+
+        cnx = mm_context(vma->vm_mm);
+
+        if (cnx != MMU_NO_CONTEXT) {
+                pteu = addr | (cnx & 0x000000ffUL);
+                if (!(pte_val(pte) & _PAGE_NX)) {
+                        IPTEU = pteu;
+                        if (IPTEL & xPTEL_V)
+                                IPTEL = ptel;
+                }
+                DPTEU = pteu;
+                if (DPTEL & xPTEL_V)
+                        DPTEL = ptel;
+        }
+
+        local_irq_restore(flags);
+}