Add initial HOS EFI Loader sources

Rsconscript

@@ -3,9 +3,9 @@ path_prepend "x86_64-elf-gcc/bin"
 
 configure do
   rscons "x86_64-elf-gcc.rb", "-b", "#{build_dir}/x86_64-elf-gcc"
-  check_program "ldc2"
-  check_program "x86_64-w64-mingw32-gcc"
-  check_program "x86_64-elf-gcc"
+  check_d_compiler "ldc2", use: "ldc2"
+  check_c_compiler "x86_64-w64-mingw32-gcc", use: "x86_64-w64-mingw32-gcc"
+  check_c_compiler "x86_64-elf-gcc", use: "x86_64-elf-gcc"
   check_c_compiler
   check_program "mformat", on_fail: "Install the mtools package"
   check_cfg package: "freetype2", on_fail: "Install libfreetype-dev", use: "freetype"
@@ -45,6 +45,7 @@ end
 
 # FontGen Environment
 fontgen_env = env "fontgen", use: "freetype" do |env|
+  env["LDCMD"].map! {|v| v == "-of" ? "-o" : v}
   env.Program("^/fontgen", glob("src/fontgen/**/*.c"))
 end
 
@@ -69,7 +70,23 @@ end
 #  env.Image("^/hos.img", %w[^/hos.elf])
 #end
 
-task "run", desc: "Run HOS in QEMU" do
-  img = kernel_env.expand("^/hos.img")
-  sh %W[qemu-system-x86_64 -bios OVMF.fd -hda #{img}]
+hel_env = env "hel", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
+  env.add_builder(Image)
+  env["sources"] = glob("src/hel/**/*.d")
+  env["sources"] += glob("uefi-d/source/**/*.d")
+  env["DC"] = "ldc2"
+  env["DFLAGS"] += %w[-mtriple=x86_64-unknown-windows-coff --betterC -release -O3]
+  env["D_IMPORT_PATH"] += %w[src uefi-d/source]
+  env["LD"] = "x86_64-w64-mingw32-gcc"
+  env["LDFLAGS"] += %w[-nostdlib -Wl,-dll -shared -Wl,--subsystem,10 -e efi_main]
+  env["LDCMD"] = %w[${LD} -o ${_TARGET} ${LDFLAGS} ${_SOURCES} ${LIBDIRPREFIX}${LIBPATH} ${LIBLINKPREFIX}${LIBS}]
+  env["OBJDUMP"] = "x86_64-w64-mingw32-objdump"
+  env.Program("^/BOOTX64.EFI", "${sources}")
+  env.Disassemble("^/BOOTX64.txt", "^/BOOTX64.EFI")
+  env.Image("^/hos.img", "^/BOOTX64.EFI")
+end
+
+task "run", desc: "Run HOS in QEMU" do
+  img = hel_env.expand("^/hos.img")
+  sh %W[qemu-system-x86_64 -bios OVMF.fd -drive file=#{img},format=raw]
 end