snippets: xen_dom0: add support for Renesas R-Car Gen3 boards

Renesas rcar_h3ulcb_ca57 and rcar_salvator_xs_m3 boards support recently
was added to Zephyr mainline. Add Xen control domain guest support for
them via xen_dom0 snippet extention.

Note: please pay attetion to overlay nodes and comments in case of any
issues on your setup.

Signed-off-by: Dmytro Firsov <[email protected]>

Author: firscity

snippets/xen_dom0/boards/rcar_h3ulcb_ca57.overlay

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2023 EPAM Systems.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &ram;
+/delete-node/ &scif2;
+
+/ {
+	/*
+	 * This node may differs on different setups, please check
+	 * following line in Xen boot log to set it right:
+	 * (XEN) Grant table range: 0x00000088080000-0x000000880c0000
+	 *
+	 * Xen passes actual values for setup in domain device tree, but Zephyr
+	 * is not capable to parse and handle it in runtime.
+	 */
+	hypervisor: hypervisor@88080000 {
+		compatible = "xen,xen";
+		reg = <0x0 0x88080000 0x0 0x40000>;
+		interrupts = <GIC_PPI 0x0 IRQ_TYPE_EDGE IRQ_DEFAULT_PRIORITY>;
+		interrupt-parent = <&gic>;
+		status = "okay";
+	};
+
+	/*
+	 * This node may differs on different setups, because Xen picks
+	 * region for Domain-0 for every specific configuration. You can
+	 * start Xen for your platform and check following log:
+	 * (XEN) Allocating 1:1 mappings for dom0:
+	 * (XEN) BANK[0] 0x00000060000000-0x00000070000000 (256MB)
+	 *
+	 * Xen passes actual values for setup in domain device tree, but Zephyr
+	 * is not capable to parse and handle it in runtime.
+	 */
+	ram: memory@60000000 {
+		device_type = "mmio-sram";
+		reg = <0x00 0x60000000 0x00 DT_SIZE_M(256)>;
+	};
+};

snippets/xen_dom0/boards/rcar_salvator_xs_m3.overlay

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2023 EPAM Systems.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/delete-node/ &ram;
+/delete-node/ &scif2;
+
+/ {
+	/*
+	 * This node may differs on different setups, please check
+	 * following line in Xen boot log to set it right:
+	 * (XEN) Grant table range: 0x00000088080000-0x000000880c0000
+	 *
+	 * Xen passes actual values for setup in domain device tree, but Zephyr
+	 * is not capable to parse and handle it in runtime.
+	 */
+	hypervisor: hypervisor@88080000 {
+		compatible = "xen,xen";
+		reg = <0x0 0x88080000 0x0 0x40000>;
+		interrupts = <GIC_PPI 0x0 IRQ_TYPE_EDGE IRQ_DEFAULT_PRIORITY>;
+		interrupt-parent = <&gic>;
+		status = "okay";
+	};
+
+	/*
+	 * This node may differs on different setups, because Xen picks
+	 * region for Domain-0 for every specific configuration. You can
+	 * start Xen for your platform and check following log:
+	 * (XEN) Allocating 1:1 mappings for dom0:
+	 * (XEN) BANK[0] 0x00000060000000-0x00000070000000 (256MB)
+	 *
+	 * Xen passes actual values for setup in domain device tree, but Zephyr
+	 * is not capable to parse and handle it in runtime.
+	 */
+	ram: memory@60000000 {
+		device_type = "mmio-sram";
+		reg = <0x00 0x60000000 0x00 DT_SIZE_M(256)>;
+	};
+};

snippets/xen_dom0/snippet.yml

@@ -7,3 +7,9 @@ boards:
   qemu_cortex_a53:
     append:
       EXTRA_DTC_OVERLAY_FILE: boards/qemu_cortex_a53.overlay
+  rcar_h3ulcb_ca57:
+    append:
+      EXTRA_DTC_OVERLAY_FILE: boards/rcar_h3ulcb_ca57.overlay
+  rcar_salvator_xs_m3:
+    append:
+      EXTRA_DTC_OVERLAY_FILE: boards/rcar_salvator_xs_m3.overlay