1 files changed, 60 insertions, 0 deletions
diff --git a/arch/nios2/kernel/sys_nios2.c b/arch/nios2/kernel/sys_nios2.c
new file mode 100644
index 000000000..b1ca85699
--- /dev/null
+++ b/arch/nios2/kernel/sys_nios2.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2013 Altera Corporation
+ * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2004 Microtronix Datacom Ltd.
+ *
+ * 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/export.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/syscalls.h>
+
+#include <asm/cacheflush.h>
+#include <asm/traps.h>
+
+/* sys_cacheflush -- flush the processor cache. */
+asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
+				unsigned int op)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *mm = current->mm;
+
+	if (len == 0)
+		return 0;
+
+	/* We only support op 0 now, return error if op is non-zero.*/
+	if (op)
+		return -EINVAL;
+
+	/* Check for overflow */
+	if (addr + len < addr)
+		return -EFAULT;
+
+	if (mmap_read_lock_killable(mm))
+		return -EINTR;
+
+	/*
+	 * Verify that the specified address region actually belongs
+	 * to this process.
+	 */
+	vma = find_vma(mm, addr);
+	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
+		mmap_read_unlock(mm);
+		return -EFAULT;
+	}
+
+	flush_cache_range(vma, addr, addr + len);
+
+	mmap_read_unlock(mm);
+	return 0;
+}
+
+asmlinkage int sys_getpagesize(void)
+{
+	return PAGE_SIZE;
+}