From 8df1646c6158b53d2a9e64c69185ed616c45a08b Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Fri, 18 Mar 2022 21:55:38 -0400
Subject: [PATCH] Add initial HULK source and linker script

---
 Rsconscript      | 35 +++++++++++++----------------------
 src/hulk/hulk.d  | 16 ++++++++++++++++
 src/hulk/hulk.ld | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 62 insertions(+), 22 deletions(-)
 create mode 100644 src/hulk/hulk.d
 create mode 100644 src/hulk/hulk.ld

diff --git a/Rsconscript b/Rsconscript
index b3725bf..b686cde 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -45,32 +45,10 @@ class FontGen < Builder
   end
 end
 
-# FontGen Environment
 fontgen_env = env "fontgen", use: "freetype" do |env|
   env.Program("^/fontgen", glob("src/fontgen/**/*.c"))
 end
 
-## Kernel Environment
-#kernel_env = env "kernel" do |env|
-#  env.add_builder(Image)
-#  env.add_builder(FontGen)
-#  env["OBJDUMP"] = "x86_64-elf-objdump"
-#  env["SIZE"] = "x86_64-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"))
-#  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.Image("^/hos.img", %w[^/hos.elf])
-#end
-
 hello_env = env "hello", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
   env.add_builder(Image)
   env["sources"] = glob("src/hello/**/*.d")
@@ -86,6 +64,19 @@ hello_env = env "hello", use: %w[ldc2 x86_64-w64-mingw32-gcc] do |env|
   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.Program("^/hulk.elf", "${sources}")
+  env.depends("^/hulk.elf", "src/hulk/hulk.ld")
+  env.Disassemble("^/hulk.txt", "^/hulk.elf")
+end
+
 task "run", desc: "Run HOS in QEMU" do
   Dir.mktmpdir do |tmpdir|
     img = hello_env.expand("^/hos.img")
diff --git a/src/hulk/hulk.d b/src/hulk/hulk.d
new file mode 100644
index 0000000..15a34df
--- /dev/null
+++ b/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 (;;)
+    {
+    }
+}
diff --git a/src/hulk/hulk.ld b/src/hulk/hulk.ld
new file mode 100644
index 0000000..672da53
--- /dev/null
+++ b/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 = .;
+}