[Xen-devel] [RFC XEN PATCH 23/23] riscv: Add iommu.c

[Bobby Eshleman <bobbyeshleman@xxxxxxxxx>]

Signed-off-by: Bobby Eshleman <bobbyeshleman@xxxxxxxxx>
---
 xen/drivers/passthrough/riscv/iommu.c | 74 +++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 xen/drivers/passthrough/riscv/iommu.c

diff --git a/xen/drivers/passthrough/riscv/iommu.c 
b/xen/drivers/passthrough/riscv/iommu.c
new file mode 100644
index 0000000000..81db4958b2
--- /dev/null
+++ b/xen/drivers/passthrough/riscv/iommu.c
@@ -0,0 +1,74 @@
+/*
+ * IOMMU framework for RISC-V
+ *
+ * Based off passthrough/arm/iommu.c
+ *
+ * Bobby Eshleman <bobbyeshleman@gmail>
+ * Copyright (c) 2019
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <xen/iommu.h>
+
+static const struct iommu_ops *iommu_ops;
+
+const struct iommu_ops *iommu_get_ops(void)
+{
+    return iommu_ops;
+}
+
+void __init iommu_set_ops(const struct iommu_ops *ops)
+{
+    BUG_ON(ops == NULL);
+
+    if ( iommu_ops && iommu_ops != ops )
+    {
+        printk("WARNING: Cannot set IOMMU ops, already set to a different 
value\n");
+        return;
+    }
+
+    iommu_ops = ops;
+}
+
+int __init iommu_hardware_setup(void)
+{
+    /* TODO */
+    return 0;
+}
+
+void __hwdom_init arch_iommu_check_autotranslated_hwdom(struct domain *d)
+{
+    /* TODO */
+    return;
+}
+
+int arch_iommu_domain_init(struct domain *d)
+{
+    /* TODO */
+    return 0;
+}
+
+void arch_iommu_domain_destroy(struct domain *d)
+{
+    /* TODO */
+}
+
+int arch_iommu_populate_page_table(struct domain *d)
+{
+    /* TODO */
+    return -ENOSYS;
+}
+
+void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
+{
+    /* TODO */
+}
-- 
2.25.0


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