[Draft] runtime: Add initial Xilinx Runtime Library (XRT) support

src/runtime/CMakeLists.txt

@@ -98,6 +98,7 @@ set(RUNTIME_CPP
     windows_yield
     write_debug_image
     x86_cpu_features
+    xrt
     )
 
 set(RUNTIME_LL
@@ -139,6 +140,7 @@ set(RUNTIME_HEADER_FILES
     HalideRuntimeQurt.h
     HalideRuntimeVulkan.h
     HalideRuntimeWebGPU.h
+    HalideRuntimeXRT.h
     )
 
 # Need to create an object library for this because CMake

src/runtime/HalideRuntimeXRT.h

@@ -0,0 +1,41 @@
+#ifndef HALIDE_HALIDERUNTIMEXRT_H
+#define HALIDE_HALIDERUNTIMEXRT_H
+
+// Don't include HalideRuntime.h if the contents of it were already pasted into a generated header above this one
+#ifndef HALIDE_HALIDERUNTIME_H
+
+#include "HalideRuntime.h"
+
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \file
+ *  Routines specific to the Halide XRT runtime.
+ */
+
+#define HALIDE_RUNTIME_XRT
+
+extern const struct halide_device_interface_t *halide_xrt_device_interface();
+
+/** These are forward declared here to allow clients to override the
+ *  Halide XRT runtime. Do not call them. */
+// @{
+extern int halide_xrt_initialize_kernels(void *user_context, void **state_ptr,
+                                         const char *kernel_name);
+extern int halide_xrt_run(void *user_context,
+                          void *state_ptr,
+                          const char *entry_name,
+                          halide_type_t arg_types[],
+                          void *args[],
+                          int8_t arg_is_buffer[]);
+extern void halide_xrt_finalize_kernels(void *user_context, void *state_ptr);
+// @}
+
+#ifdef __cplusplus
+}  // End extern "C"
+#endif
+
+#endif  // HALIDE_HALIDERUNTIMEXRT_H