[xen] Add basic support for PV-HVM domains

Add basic support for Xen PV-HVM domains (detected via the Xen
platform PCI device with IDs 5853:0001), including support for
accessing configuration via XenStore and enumerating devices via
XenBus.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/include/ipxe/xenmem.h b/src/include/ipxe/xenmem.h
new file mode 100644
index 000000000..9b9aeda9c
--- /dev/null
+++ b/src/include/ipxe/xenmem.h
@@ -0,0 +1,46 @@
+#ifndef _IPXE_XENMEM_H
+#define _IPXE_XENMEM_H
+
+/** @file
+ *
+ * Xen memory operations
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/xen.h>
+#include <xen/memory.h>
+
+/**
+ * Add page to physical address space
+ *
+ * @v xen		Xen hypervisor
+ * @v add		Page mapping descriptor
+ * @ret xenrc		Xen status code
+ */
+static inline __attribute__ (( always_inline )) int
+xenmem_add_to_physmap ( struct xen_hypervisor *xen,
+			struct xen_add_to_physmap *add ) {
+
+	return xen_hypercall_2 ( xen, __HYPERVISOR_memory_op,
+				 XENMEM_add_to_physmap, virt_to_phys ( add ) );
+}
+
+/**
+ * Remove page from physical address space
+ *
+ * @v xen		Xen hypervisor
+ * @v remove		Page mapping descriptor
+ * @ret xenrc		Xen status code
+ */
+static inline __attribute__ (( always_inline )) int
+xenmem_remove_from_physmap ( struct xen_hypervisor *xen,
+			     struct xen_remove_from_physmap *remove ) {
+
+	return xen_hypercall_2 ( xen, __HYPERVISOR_memory_op,
+				 XENMEM_remove_from_physmap,
+				 virt_to_phys ( remove ) );
+}
+
+#endif /* _IPXE_XENMEM_H */