Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mn10300 / mm / mmu-context.c

diff --git a/kernel/arch/mn10300/mm/mmu-context.c b/kernel/arch/mn10300/mm/mmu-context.c
new file mode 100644 (file)
index 0000000..a4f7d3d
--- /dev/null
+++ b/kernel/arch/mn10300/mm/mmu-context.c
@@ -0,0 +1,62 @@
+/* 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>
+
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+/*
+ * 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 - MMU_CONTEXT_TLBPID_LOCK_NR),
+};
+#endif /* CONFIG_MN10300_TLB_USE_PIDR */
+
+/*
+ * preemptively set a TLB entry
+ */
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+{
+       unsigned long pteu, ptel, cnx, flags;
+       pte_t pte = *ptep;
+
+       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 = ~MMU_NO_CONTEXT;
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+       cnx = mm_context(vma->vm_mm);
+#endif
+
+       if (cnx != MMU_NO_CONTEXT) {
+               pteu = addr;
+#ifdef CONFIG_MN10300_TLB_USE_PIDR
+               pteu |= cnx & MMU_CONTEXT_TLBPID_MASK;
+#endif
+               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);
+}