Generate HULK binary

.gitignore

@@ -1,3 +1,3 @@
 .rscons*
-/i686-elf-gcc/
+/x86_64-elf-gcc/
 /build/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "uefi-d"]
+	path = uefi-d
+	url = git://github.com/kubasz/uefi-d

Rsconscript

@@ -1,98 +1,31 @@
-path_prepend "i686-elf-gcc/bin"
-
-configure do
-  rscons "i686-elf-gcc.rb", "-b", "#{build_dir}/i686-elf-gcc"
-  check_c_compiler "i686-elf-gcc"
-  check_program "genext2fs"
-  check_program "grub-mkstandalone"
-  check_program "mformat", on_fail: "Install the mtools package"
-  check_program "xorriso"
-  check_cfg package: "freetype2", on_fail: "Install libfreetype-dev", use: "freetype"
-end
-
 require "tmpdir"
 
-# EFI (w/ GRUB) partition size (MiB)
-EFI_PART_SIZE = 8
-# HOS partition size (MiB)
-HOS_PART_SIZE = 4
-# Kernel default font size
+project_name "HOS"
+path_prepend "x86_64-elf-gcc/bin"
+
+configure do
+  rscons "x86_64-elf-gcc.rb", "-b", "#{build_dir}/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"
+  sh %w[git submodule update --init]
+end
+
+# Kernel default font size.
 KFONT_SIZE = 15
 
-class BiosImage < Builder
+class Image < Builder
   def run(options)
     unless @cache.up_to_date?(@target, nil, @sources, @env)
-      print_run_message("Generating BIOS boot image #{@target}", nil)
-      Dir.mktmpdir do |tmpdir|
-        # Create iso directory.
-        FileUtils.mkdir_p("#{tmpdir}/iso/boot/grub")
-        File.open("#{tmpdir}/iso/boot/grub/grub.cfg", "wb") do |fh|
-          fh.write(<<EOF)
-set default="0"
-set timeout=1
-menuentry "HOS" {
-insmod multiboot2
-multiboot2 /hos.elf
-}
-EOF
-        end
-        @sources.each do |source|
-          FileUtils.cp(source, "#{tmpdir}/iso")
-        end
-        # Build bootable GRUB image.
-        system(*%W[grub-mkrescue -o #{@target} #{tmpdir}/iso], err: "#{@env.build_root}/grub-mkrescue.log")
-      end
-      @cache.register_build(@target, nil, @sources, @env)
-    end
-    true
-  end
-end
-
-class EfiImage < Builder
-  def run(options)
-    unless @cache.up_to_date?(@target, nil, @sources, @env)
-      print_run_message("Generating EFI boot image #{@target}", nil)
-      Dir.mktmpdir do |tmpdir|
-        # Build a standalone GRUB.
-        File.open("#{tmpdir}/grub.cfg", "wb") do |fh|
-          fh.write(<<EOF)
-insmod part_gpt
-configfile (hd0,gpt2)/grub.cfg
-EOF
-        end
-        system(*%W[grub-mkstandalone -O x86_64-efi -o #{tmpdir}/BOOTX64.EFI boot/grub/grub.cfg=#{tmpdir}/grub.cfg])
-        # Create EFI partition.
-        system(*%W[dd if=/dev/zero of=#{tmpdir}/efi.part bs=1M count=#{EFI_PART_SIZE}], err: "/dev/null")
-        system(*%W[mformat -i #{tmpdir}/efi.part ::])
-        system(*%W[mmd -i #{tmpdir}/efi.part ::/EFI])
-        system(*%W[mmd -i #{tmpdir}/efi.part ::/EFI/BOOT])
-        system(*%W[mcopy -i #{tmpdir}/efi.part #{tmpdir}/BOOTX64.EFI ::/EFI/BOOT])
-        # Create ext2 HOS partition.
-        FileUtils.mkdir_p("#{tmpdir}/ext2")
-        @sources.each do |source|
-          FileUtils.cp(source, "#{tmpdir}/ext2")
-        end
-        File.open("#{tmpdir}/ext2/grub.cfg", "wb") do |fh|
-          fh.write(<<EOF)
-set default="0"
-set timeout=1
-menuentry "HOS" {
-insmod part_gpt
-insmod multiboot2
-set root=(hd0,gpt2)
-multiboot2 /hos.elf
-}
-EOF
-        end
-        system(*%W[genext2fs -b #{HOS_PART_SIZE * 1024} -d #{tmpdir}/ext2 #{tmpdir}/ext2.part])
-        # Create full disk image.
-        system(*%W[dd if=/dev/zero of=#{@target} bs=1M count=#{EFI_PART_SIZE + HOS_PART_SIZE + 2}], err: "/dev/null")
-        system(*%W[parted -s #{@target} mklabel gpt])
-        system(*%W[parted -s #{@target} mkpart efi 1MiB #{EFI_PART_SIZE + 1}MiB])
-        system(*%W[parted -s #{@target} mkpart hos #{EFI_PART_SIZE + 1}MiB #{EFI_PART_SIZE + HOS_PART_SIZE + 1}MiB])
-        system(*%W[dd if=#{tmpdir}/efi.part of=#{@target} bs=1M seek=1 conv=notrunc], err: "/dev/null")
-        system(*%W[dd if=#{tmpdir}/ext2.part of=#{@target} bs=1M seek=#{1 + EFI_PART_SIZE} conv=notrunc], err: "/dev/null")
-      end
+      print_run_message("Creating disk image <target>#{@target}<reset>", nil)
+      File.binwrite(@target, "\0" * (1440 * 1024))
+      system(*%W[mformat -i #{@target} -f 1440 ::])
+      system(*%W[mmd -i #{@target} ::/EFI])
+      system(*%W[mmd -i #{@target} ::/EFI/BOOT])
+      system(*%W[mcopy -i #{@target} #{@sources.first} ::/EFI/BOOT])
       @cache.register_build(@target, nil, @sources, @env)
     end
     true
@@ -112,55 +45,46 @@ class FontGen < Builder
   end
 end
 
-class Size < Builder
-  def run(options)
-    if @command
-      finalize_command
-    else
-      @vars["_SOURCES"] = @sources
-      @vars["_TARGET"] = @target
-      command = @env.build_command(%w[${SIZE} ${_SOURCES}], @vars)
-      standard_command("Size <target>#{@target}<reset>", command, stdout: @target)
-    end
-  end
-end
-
-# FontGen Environment
 fontgen_env = env "fontgen", use: "freetype" do |env|
-  env["CC"] = "gcc"
-  env.Program("^/fontgen.bin", glob("fontgen/**/*.c"))
+  env.Program("^/fontgen", glob("src/fontgen/**/*.c"))
 end
 
-# Kernel Environment
-kernel_env = env "kernel" do |env|
-  env.add_builder(EfiImage)
-  env.add_builder(BiosImage)
-  env.add_builder(FontGen)
-  env.add_builder(Size)
-  env["OBJDUMP"] = "i686-elf-objdump"
-  env["SIZE"] = "i686-elf-size"
-  env["CCFLAGS"] += %w[-ffreestanding -Wall -O2]
-  env["LDFLAGS"] += %w[-ffreestanding -nostdlib -T src/link.ld]
-  env["LDFLAGS"] += %W[-Wl,-Map,${_TARGET}.map]
-  env["LIBS"] += %w[gcc]
-  env.FontGen("^/kfont/kfont.c", "font/Hack-Regular.ttf",
-             "fontgen" => fontgen_env.expand("^/fontgen.bin"))
-  env.barrier
-  env["CPPPATH"] += ["#{env.build_root}/kfont"]
-  env.Program("^/hos.elf", glob("src/**/*.{S,c}") + ["^/kfont/kfont.c"])
-  env.depends("#{env.build_root}/hos.elf", "src/link.ld")
-  env.Disassemble("^/hos.elf.txt", "^/hos.elf")
-  env.Size("^/hos.elf.size", "^/hos.elf")
-  env.EfiImage("^/hos-efi.img", %w[^/hos.elf])
-  env.BiosImage("^/hos.img", %w[^/hos.elf])
+hello_env = env "hello", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
+  env.add_builder(Image)
+  env["sources"] = glob("src/hello/**/*.d")
+  env["sources"] += glob("uefi-d/source/**/*.d")
+  env["DFLAGS"] += %w[-mtriple=x86_64-unknown-windows-coff --betterC -release -O3 --wi --enable-cross-module-inlining]
+  env["D_IMPORT_PATH"] += %w[src/hello src/hulk uefi-d/source src/common]
+  env["LD"] = "x86_64-w64-mingw32-gcc"
+  env["LDFLAGS"] += %w[-nostdlib -Wl,-dll -shared -Wl,--subsystem,10 -e efi_main -Wl,-Map,${_TARGET}.map]
+  env["LDCMD"] = %w[${LD} -o ${_TARGET} ${LDFLAGS} ${_SOURCES} ${LIBDIRPREFIX}${LIBPATH} ${LIBLINKPREFIX}${LIBS}]
+  env["OBJDUMP"] = "x86_64-w64-mingw32-objdump"
+  env.Program("^/BOOTX64.EFI", "${sources}")
+  env.Disassemble("^/BOOTX64.txt", "^/BOOTX64.EFI")
+  env.Image("^/hos.img", "^/BOOTX64.EFI")
+end
+
+hulk_env = env "hulk", use: %w[ldc2 x86_64-elf-gcc] do |env|
+  env["sources"] = glob("src/hulk/**/*.d")
+  env["DFLAGS"] += %w[-mtriple=x86_64-unknown-elf --betterC -release -O3 --wi --enable-cross-module-inlining]
+  env["D_IMPORT_PATH"] += %w[src/hulk src/common]
+  env["LD"] = "x86_64-elf-gcc"
+  env["LDFLAGS"] += %w[-nostdlib -Tsrc/hulk/hulk.ld -Wl,-Map,${_TARGET}.map]
+  env["LDCMD"] = %w[${LD} -o ${_TARGET} ${LDFLAGS} ${_SOURCES} ${LIBDIRPREFIX}${LIBPATH} ${LIBLINKPREFIX}${LIBS}]
+  env["OBJDUMP"] = "x86_64-elf-objdump"
+  env["OBJCOPY"] = "x86_64-elf-objcopy"
+  env.Program("^/hulk.elf", "${sources}")
+  env.depends("^/hulk.elf", "src/hulk/hulk.ld")
+  env.Disassemble("^/hulk.txt", "^/hulk.elf")
+  env.Command("^/hulk.bin", "^/hulk.elf",
+              "CMD" => %W[${OBJCOPY} -O binary ${_SOURCES} ${_TARGET}],
+              "CMD_DESC" => "Convert ELF to binary:")
 end
 
 task "run", desc: "Run HOS in QEMU" do
-  img = kernel_env.expand("^/hos.img")
-  sh %W[qemu-system-x86_64 -hda #{img}]
+  Dir.mktmpdir do |tmpdir|
+    img = hello_env.expand("^/hos.img")
+    FileUtils.cp(img, tmpdir)
+    sh %W[qemu-system-x86_64 -bios OVMF.fd -drive file=#{tmpdir}/hos.img,format=raw]
   end
-
-task "run-efi", desc: "Run HOS EFI in QEMU" do
-  img = kernel_env.expand("^/hos-efi.img")
-  sh %W[qemu-system-x86_64 -bios OVMF.fd -hda #{img}]
 end

rscons

@@ -24,7 +24,7 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 
-script = File.join(File.dirname(__FILE__), ".rscons-3.0.0-077c0388ca4d1d902141299abcc4b8f6.rb")
+script = File.join(File.dirname(__FILE__), ".rscons-3.0.2-c49c635f1e4166223367979510498b28.rb")
 unless File.exists?(script)
   if File.read(__FILE__, mode: "rb") =~ /^#==>(.*)/
     require "zlib"
@@ -43,4 +43,4 @@ load script
 if __FILE__ == $0
   Rscons::Cli.new.run(ARGV)
 end
-#==>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truncated
+#==>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truncated

src/common/hos/cpu.d

@@ -0,0 +1,26 @@
+import ldc.llvmasm;
+
+ulong read_cr0()
+{
+    return __asm!ulong("mov %cr0, %rax", "={rax}");
+}
+
+ulong read_cr2()
+{
+    return __asm!ulong("mov %cr2, %rax", "={rax}");
+}
+
+ulong read_cr3()
+{
+    return __asm!ulong("mov %cr3, %rax", "={rax}");
+}
+
+void write_cr3(ulong v)
+{
+    __asm("mov $0, %cr3", "r", v);
+}
+
+ulong read_cr4()
+{
+    return __asm!ulong("mov %cr4, %rax", "={rax}");
+}

src/common/hos/memory.d

@@ -0,0 +1,57 @@
+import ldc.llvmasm;
+
+void memset(void * dest, ubyte v, size_t n)
+{
+    __asm("rep stosb",
+          "{al},{rcx},{rdi},~{rcx},~{rdi},~{memory}",
+          v, n, dest);
+}
+
+void memset16(void * dest, ushort v, size_t n)
+{
+    __asm("rep stosw",
+          "{ax},{rcx},{rdi},~{rcx},~{rdi},~{memory}",
+          v, n, dest);
+}
+
+void memset32(void * dest, uint v, size_t n)
+{
+    __asm("rep stosl",
+          "{eax},{rcx},{rdi},~{rcx},~{rdi},~{memory}",
+          v, n, dest);
+}
+
+void memset64(void * dest, ulong v, size_t n)
+{
+    __asm("rep stosq",
+          "{rax},{rcx},{rdi},~{rcx},~{rdi},~{memory}",
+          v, n, dest);
+}
+
+void memcpy(void * dest, void * src, size_t n)
+{
+    __asm("rep movsb",
+          "{rcx},{rsi},{rdi},~{rcx},~{rsi},~{rdi},~{memory}",
+          n, src, dest);
+}
+
+void memcpy16(void * dest, void * src, size_t n)
+{
+    __asm("rep movsw",
+          "{rcx},{rsi},{rdi},~{rcx},~{rsi},~{rdi},~{memory}",
+          n, src, dest);
+}
+
+void memcpy32(void * dest, void * src, size_t n)
+{
+    __asm("rep movsl",
+          "{rcx},{rsi},{rdi},~{rcx},~{rsi},~{rdi},~{memory}",
+          n, src, dest);
+}
+
+void memcpy64(void * dest, void * src, size_t n)
+{
+    __asm("rep movsq",
+          "{rcx},{rsi},{rdi},~{rcx},~{rsi},~{rdi},~{memory}",
+          n, src, dest);
+}

src/common/hos/page_table.d

@@ -0,0 +1,33 @@
+struct PageTableEntry
+{
+    ulong entry;
+
+    this(ulong address, ulong no_execute, ulong global,
+            ulong huge, ulong disable_cache, ulong write_through, ulong user,
+            ulong writable, ulong present)
+    {
+        entry = (present |
+                (writable << 1) |
+                (user << 2) |
+                (write_through << 3) |
+                (disable_cache << 4) |
+                (huge << 7) |
+                (global << 8) |
+                (no_execute << 63)) | address;
+    }
+
+    bool present()
+    {
+        return (entry & 0x1u) != 0u;
+    }
+
+    PageTableEntry * next()
+    {
+        return cast(PageTableEntry *)(entry & 0x7FFF_FFFF_FFFF_F000u);
+    }
+
+    static ulong page_table_index(ulong address, size_t level)
+    {
+        return ((address >> (39u - 9u * level)) & 0x1FFu);
+    }
+}

src/hello/hello.d

@@ -0,0 +1,215 @@
+import uefi;
+import output;
+import scratch;
+import hulk.bootinfo;
+import hos.page_table;
+import hos.cpu;
+import hos.memory;
+
+__gshared EFI_SYSTEM_TABLE * st;
+__gshared BootInfo bootinfo;
+__gshared UINTN memory_map_key;
+
+private void wait_key()
+{
+    writeln("Press any key...");
+    st.ConIn.Reset(st.ConIn, FALSE);
+    EFI_INPUT_KEY key;
+    while (st.ConIn.ReadKeyStroke(st.ConIn, &key) == EFI_NOT_READY)
+    {
+    }
+}
+
+private bool in_qemu()
+{
+    ulong * firmware_vendor = cast(ulong *) st.FirmwareVendor;
+    ulong fv1 = firmware_vendor[0];
+    return fv1 ==
+        ((cast(ulong)'E') |
+         (cast(ulong)'D' << 16) |
+         (cast(ulong)'K' << 32) |
+         (cast(ulong)' ' << 48));
+}
+
+private bool set_graphics_mode()
+{
+    uint max_horizontal_resolution = in_qemu() ? 1920u : 0xFFFFFFFFu;
+    UINTN buffer_size = scratch_free();
+    EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+    EFI_HANDLE * handles = cast(EFI_HANDLE *)scratch_current();
+    EFI_STATUS status = st.BootServices.LocateHandle(ByProtocol,
+            &gop_guid, null, &buffer_size, handles);
+    if (status != EFI_SUCCESS)
+    {
+        writeln("LocateHandle: error %x", status);
+        return false;
+    }
+    EFI_HANDLE gop_handle = handles[0];
+    EFI_HANDLE gop_interface;
+    status = st.BootServices.HandleProtocol(gop_handle,
+            &gop_guid, &gop_interface);
+    if (status != EFI_SUCCESS)
+    {
+        writeln("HandleProtocol: error %x", status);
+        return false;
+    }
+    if (gop_interface == null)
+    {
+        writeln("null interface from HandleProtocol");
+        return false;
+    }
+    EFI_GRAPHICS_OUTPUT_PROTOCOL * gop = cast(EFI_GRAPHICS_OUTPUT_PROTOCOL *)gop_interface;
+    UINTN info_size;
+    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION * info;
+    uint best_width;
+    uint best_mode_number;
+    for (uint mode_number = 0u;
+         (status = gop.QueryMode(gop, mode_number, &info_size, &info)) == EFI_SUCCESS;
+         mode_number++)
+    {
+        if ((info.HorizontalResolution > best_width) &&
+            (info.HorizontalResolution <= max_horizontal_resolution))
+        {
+            best_width = info.HorizontalResolution;
+            best_mode_number = mode_number;
+        }
+        st.BootServices.FreePool(info);
+    }
+    if ((status = gop.SetMode(gop, best_mode_number)) != EFI_SUCCESS)
+    {
+        writeln("SetMode: Error %x\n", status);
+        return false;
+    }
+    bootinfo.fb.buffer = cast(uint *)gop.Mode.FrameBufferBase;
+    bootinfo.fb.width = gop.Mode.Info.HorizontalResolution;
+    bootinfo.fb.height = gop.Mode.Info.VerticalResolution;
+    bootinfo.fb.stride = gop.Mode.Info.PixelsPerScanLine;
+    bootinfo.fb.format = gop.Mode.Info.PixelFormat;
+    return true;
+}
+
+private bool get_memory_map()
+{
+    UINTN memory_map_size = scratch_free();
+    UINTN descriptor_size;
+    UINT32 descriptor_version;
+    ubyte * scratch_base = scratch_current();
+    UINTN status = st.BootServices.GetMemoryMap(
+            &memory_map_size,
+            cast(EFI_MEMORY_DESCRIPTOR *)scratch_base,
+            &memory_map_key,
+            &descriptor_size,
+            &descriptor_version);
+    if (status != EFI_SUCCESS)
+    {
+        writeln("GetMemoryMap: Error %x", status);
+        return false;
+    }
+    size_t n_entries = memory_map_size / descriptor_size;
+    size_t di;
+    for (size_t i = 0u; i < n_entries; i++)
+    {
+        EFI_MEMORY_DESCRIPTOR * descriptor = cast(EFI_MEMORY_DESCRIPTOR *)&scratch_base[i * descriptor_size];
+        if ((descriptor.Type == EfiConventionalMemory) ||
+            (descriptor.Type == EfiBootServicesCode) ||
+            (descriptor.Type == EfiBootServicesData))
+        {
+            bootinfo.memory_map[di].base = descriptor.PhysicalStart;
+            bootinfo.memory_map[di].size = descriptor.NumberOfPages * 4096u;
+            di++;
+        }
+    }
+    bootinfo.memory_map_count = di;
+    return true;
+}
+
+private PageTableEntry * new_page_table()
+{
+    PageTableEntry * pt = cast(PageTableEntry *)scratch_alloc(1u);
+    memset64(pt, 0u, 512);
+    return pt;
+}
+
+private void map(ulong source_page, ulong dest_page, PageTableEntry * pt_base)
+{
+    PageTableEntry * pt = pt_base;
+    PageTableEntry * next_pt;
+    for (size_t level = 0; level < 4u; level++)
+    {
+        size_t pt_index = PageTableEntry.page_table_index(source_page, level);
+        if (pt[pt_index].present())
+        {
+            pt = pt[pt_index].next();
+        }
+        else
+        {
+            ulong addr;
+            if (level < 3u)
+            {
+                next_pt = new_page_table();
+                addr = cast(ulong)next_pt;
+            }
+            else
+            {
+                addr = dest_page;
+            }
+            pt[pt_index] = PageTableEntry(addr,
+                    0u, 0u, 0u, 0u, 0u, 0u, 1u, 1u);
+            pt = next_pt;
+        }
+    }
+}
+
+private void build_page_tables()
+{
+    PageTableEntry * pt_base = new_page_table();
+    for (size_t i = 0u; i < bootinfo.memory_map_count; i++)
+    {
+        size_t n_pages = bootinfo.memory_map[i].size / 4096u;
+        for (size_t p = 0u; p < n_pages; p++)
+        {
+            ulong page_addr = bootinfo.memory_map[i].base + 4096u * p;
+            /* Identity map all pages. */
+            map(page_addr, page_addr, pt_base);
+        }
+    }
+    write_cr3(cast(ulong)pt_base);
+}
+
+extern (C) EFI_STATUS efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * st)
+{
+    .st = st;
+
+    st.ConOut.ClearScreen(st.ConOut);
+
+    writeln("HELLO, HOS EFI Lightweight LOader, v0.1.0");
+    writeln("Firmware vendor: '%S', version: 0x%x", st.FirmwareVendor, st.FirmwareVendor);
+
+    if (!set_graphics_mode())
+    {
+        wait_key();
+        return EFI_SUCCESS;
+    }
+
+    for (;;)
+    {
+        get_memory_map();
+
+        EFI_STATUS status = st.BootServices.ExitBootServices(image_handle, memory_map_key);
+        if (status == EFI_INVALID_PARAMETER)
+        {
+            continue;
+        }
+        if (status == EFI_SUCCESS)
+        {
+            break;
+        }
+        writeln("ExitBootServices: Error %x", status);
+        wait_key();
+        return EFI_SUCCESS;
+    }
+
+    build_page_tables();
+
+    return EFI_SUCCESS;
+}

src/hello/output.d

@@ -0,0 +1,122 @@
+import uefi;
+import hello;
+import core.stdc.stdarg;
+
+private size_t format_hex(CHAR16 * s, ulong v, bool ptr)
+{
+    string hex_chars = "0123456789ABCDEF";
+    bool print = ptr;
+    size_t si = 0u;
+    for (size_t i = 0u; i < 16u; i++)
+    {
+        if (ptr && (i == 8u))
+        {
+            s[si++] = '_';
+        }
+        ulong n = (v >> (60u - 4u * i)) & 0xFu;
+        if (n != 0u)
+        {
+            print = true;
+        }
+        if (print || (i == 15u))
+        {
+            s[si++] = hex_chars[n];
+        }
+    }
+    return si;
+}
+
+private size_t format_dec(CHAR16 * s, ulong v)
+{
+    string dec_chars = "0123456789";
+    bool print;
+    char[20] buf;
+    size_t buf_i;
+    while ((buf_i == 0u) || (v != 0u))
+    {
+        ulong n = v % 10u;
+        buf[buf_i++] = dec_chars[n];
+        v /= 10u;
+    }
+    for (size_t si = 0u; si < buf_i; si++)
+    {
+        s[si] = buf[buf_i - si - 1u];
+    }
+    return buf_i;
+}
+
+void write(string s, va_list args)
+{
+    __gshared static CHAR16[256] s16;
+    size_t i = 0u;
+    bool escape = false;
+    foreach (char c; s)
+    {
+        if (escape)
+        {
+            if (c == '%')
+            {
+                s16[i++] = '%';
+            }
+            else if (c == 'x')
+            {
+                ulong v;
+                va_arg(args, v);
+                i += format_hex(&s16[i], v, false);
+            }
+            else if (c == 'p')
+            {
+                ulong v;
+                va_arg(args, v);
+                i += format_hex(&s16[i], v, true);
+            }
+            else if (c == 'S')
+            {
+                const(CHAR16) * s2;
+                va_arg(args, s2);
+                for (size_t s2_i = 0u; s2[s2_i] != 0; s2_i++)
+                {
+                    s16[i++] = s2[s2_i];
+                }
+            }
+            else if (c == 'u')
+            {
+                ulong v;
+                va_arg(args, v);
+                i += format_dec(&s16[i], v);
+            }
+            else
+            {
+                s16[i++] = c;
+            }
+            escape = false;
+        }
+        else if (c == '%')
+        {
+            escape = true;
+        }
+        else
+        {
+            s16[i++] = c;
+        }
+    }
+    s16[i++] = 0u;
+    st.ConOut.OutputString(st.ConOut, &s16[0]);
+}
+
+extern (C) void write(string s, ...)
+{
+    va_list args;
+    va_start(args, s);
+    write(s, args);
+    va_end(args);
+}
+
+extern (C) void writeln(string s, ...)
+{
+    va_list args;
+    va_start(args, s);
+    write(s, args);
+    write("\r\n", args);
+    va_end(args);
+}

src/hello/scratch.d

@@ -0,0 +1,19 @@
+__gshared ubyte[512 * 1024] scratch;
+__gshared size_t scratch_used;
+
+size_t scratch_free()
+{
+    return scratch.sizeof - scratch_used;
+}
+
+ubyte * scratch_current()
+{
+    return &scratch[scratch_used];
+}
+
+ubyte * scratch_alloc(size_t n = 1)
+{
+    ubyte * address = &scratch[scratch_used];
+    scratch_used += 4096u * n;
+    return address;
+}

src/hulk/hulk.d

@@ -0,0 +1,16 @@
+import hulk.bootinfo;
+import hos.memory;
+import ldc.attributes;
+
+@(ldc.attributes.section(".hulk_start"))
+extern(C) void hulk_start(BootInfo * bootinfo)
+{
+    for (size_t y = 100u; y < 120u; y++)
+    {
+        memset32(&bootinfo.fb.buffer[y * bootinfo.fb.stride + 20u], 0xFF8800u, 20u);
+    }
+
+    for (;;)
+    {
+    }
+}

src/hulk/hulk.ld

@@ -0,0 +1,33 @@
+ENTRY(hulk_start)
+
+SECTIONS
+{
+    . = 0x0000800000000000;
+    _hulk_mem_start = .;
+
+    .text BLOCK(4K) : ALIGN(4K)
+    {
+        *(.hulk_start)
+        *(.text)
+    }
+
+    .rodata BLOCK(4K) : ALIGN(4K)
+    {
+        *(.rodata)
+    }
+
+    .data BLOCK(4K) : ALIGN(4K)
+    {
+        *(.data)
+    }
+
+    .bss BLOCK(4K) : ALIGN(4K)
+    {
+        *(COMMON)
+        *(.bss)
+    }
+
+    . = ALIGN(4K);
+
+    _hulk_mem_end = .;
+}

src/hulk/hulk/bootinfo.d

@@ -0,0 +1,22 @@
+struct BootInfo
+{
+    struct MemoryRegion
+    {
+        ulong base;
+        size_t size;
+    }
+    struct Framebuffer
+    {
+        uint * buffer;
+        uint width;
+        uint height;
+        uint stride;
+        uint format;
+    }
+
+    Framebuffer fb;
+    MemoryRegion[500] memory_map;
+    size_t memory_map_count;
+}
+
+enum ulong HULK_VIRTUAL_START = 0x0000_8000_0000_0000u;

x86_64-elf-gcc.rb

@@ -1,9 +1,10 @@
+project_name "x86_64-elf-gcc"
 binutils_version = "2.35"
 binutils_checksum = "1b11659fb49e20e18db460d44485f09442c8c56d5df165de9461eb09c8302f85"
 gcc_version = "10.2.0"
 gcc_checksum = "b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c"
-install_path = File.expand_path("i686-elf-gcc")
-target = "i686-elf"
+install_path = File.expand_path("x86_64-elf-gcc")
+target = "x86_64-elf"
 path_prepend "#{install_path}/bin"
 
 configure do
@@ -53,7 +54,7 @@ default do
     cd "#{build_dir}/build-gcc" do
       sh %W[../gcc-#{gcc_version}/configure
         --target=#{target} --prefix=#{install_path} --disable-nls
-        --enable-languages=c,c++ --without-headers]
+        --enable-languages=c --without-headers]
       sh "make all-gcc"
       sh "make all-target-libgcc"
       sh "make install-gcc"