From 410829451bb1bc01691308acb850c7bba9075075 Mon Sep 17 00:00:00 2001
From: Dennis Kobert <dennis@kobert.dev>
Date: Fri, 25 Oct 2019 16:11:37 +0200
Subject: Iink rust binary

---
 kernel/Cargo.toml             |  3 +++
 kernel/build.sh               | 10 +++++++---
 kernel/src/lib.rs             |  3 +++
 kernel/src/linker.ld          |  2 +-
 kernel/src/long_mode_init.asm |  4 ++++
 5 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 410d6d7..9dd89c3 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2018"
 
 [lib]
 crate-type = ["staticlib"]
+
+[dependencies]
+compiler_builtins = { git = "https://github.com/rust-lang/compiler-builtins" }
diff --git a/kernel/build.sh b/kernel/build.sh
index 4a8130b..8fa91ce 100755
--- a/kernel/build.sh
+++ b/kernel/build.sh
@@ -1,14 +1,18 @@
 #!/usr/bin/sh
 
 ASM_PATH="src/"
-TARGET_PATH="target/"
+TARGET_PATH="target"
 TMP_PATH="$TARGET_PATH/temp/"
 OBJ_PATH="$TMP_PATH"
 LINK_SCRIPT_PATH="src/"
 GRUB_CFG_PATH="src/grub.cfg"
+ARCH="x86_64"
+TARGET="$ARCH-uff"
+RUST_BIN="$TARGET_PATH/$TARGET/debug/libkernel.a"
 
 remove_target() {
-    rm -rf $TARGET_PATH &> /dev/null
+    rm -rf $TMP_PATH/* &> /dev/null
+    rm -f $TARGET_PATH/uff.iso &> /dev/null
 }
 
 create_target() {
@@ -27,7 +31,7 @@ build_kernel_elf() {
     for f in $ASM_PATH/*.asm; do
         nasm -felf64 "$f" -o $OBJ_PATH/"$(basename -s .asm $f)".o
     done
-    ld -n -o $TARGET_PATH/kernel.bin -T $LINK_SCRIPT_PATH/linker.ld $OBJ_PATH/*.o
+    ld -n -o $TARGET_PATH/kernel.bin -gc-sections -T $LINK_SCRIPT_PATH/linker.ld $OBJ_PATH/*.o $RUST_BIN
     cleanup_temp
 }
 
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index 066a526..05b90ef 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -1,6 +1,9 @@
+#![feature(compiler_builtins_lib)]
 #![no_std]
 #![no_main]
 
+extern crate compiler_builtins;
+
 #[no_mangle]
 pub extern "C" fn _start() -> ! {
     loop {}
diff --git a/kernel/src/linker.ld b/kernel/src/linker.ld
index cef8809..9b5355c 100644
--- a/kernel/src/linker.ld
+++ b/kernel/src/linker.ld
@@ -6,7 +6,7 @@ SECTIONS {
     .boot :
     {
         /* ensure that the multiboot heater is at the beginning */
-        *(.multiboot_header)
+        KEEP(*(.multiboot_header))
     }
 
     .text :
diff --git a/kernel/src/long_mode_init.asm b/kernel/src/long_mode_init.asm
index f105388..751af9b 100644
--- a/kernel/src/long_mode_init.asm
+++ b/kernel/src/long_mode_init.asm
@@ -14,4 +14,8 @@ long_mode_start:
     ; print `Uff!` to screen
     mov rax, 0x8521846683668255
     mov qword [0xb8000], rax
+
+	extern _start
+	call _start
+
     hlt
-- 
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