Rewrite core of the XTLDR boot loader

Reviewed-on: xt-sys/exectos#7
Reviewed-by: Piotr Likoski <likoski@noreply.codingworkshop.git>
Co-authored-by: Rafal Kupiec <belliash@codingworkshop.eu.org>
Co-committed-by: Rafal Kupiec <belliash@codingworkshop.eu.org>

xtldr/modules/xtos_o/CMakeLists.txt

@@ -0,0 +1,28 @@
+# XT Boot Loader
+PROJECT(XTLDR_XTOS_O)
+
+# Specify include directories
+include_directories(
+    ${EXECTOS_SOURCE_DIR}/sdk/xtdk
+    ${XTLDR_XTOS_O_SOURCE_DIR}/includes)
+
+# Specify list of source code files
+list(APPEND XTLDR_XTOS_O_SOURCE
+    ${XTLDR_XTOS_O_SOURCE_DIR}/${ARCH}/memory.c
+    ${XTLDR_XTOS_O_SOURCE_DIR}/memory.c
+    ${XTLDR_XTOS_O_SOURCE_DIR}/xtos.c)
+
+# Link bootloader executable
+add_executable(xtos_o ${XTLDR_XTOS_O_SOURCE})
+
+# Add linker libraries
+target_link_libraries(xtos_o libxtos libxtldr)
+
+# Set proper binary name and install target
+set_target_properties(xtos_o PROPERTIES SUFFIX .efi)
+set_install_target(xtos_o efi/boot/xtldr/modules)
+
+# Set module entrypoint and subsystem
+set_entrypoint(xtos_o "XtLdrModuleMain")
+set_linker_map(xtos_o TRUE)
+set_subsystem(xtos_o efi_boot_service_driver)