boot/amd64: Add second stage groundwork

Signed-off-by: Chloe M. <chloe@aptel.org>

4 files changed, 30 insertions, 5 deletions

diff --git a/boot/arch/amd64/Makefile b/boot/arch/amd64/Makefile
index e92fecb..5185063 100644
--- a/boot/arch/amd64/Makefile
+++ b/boot/arch/amd64/Makefile
@@ -1,5 +1,9 @@
 .PHONY: all
-all: mbr
+all: biosboot mbr
+
+.PHONY: biosboot
+biosboot:
+	cd biosboot/; $(MAKE)
 
 .PHONY: mbr
 mbr:
diff --git a/boot/arch/amd64/biosboot/Makefile b/boot/arch/amd64/biosboot/Makefile
new file mode 100644
index 0000000..c782240
--- /dev/null
+++ b/boot/arch/amd64/biosboot/Makefile
@@ -0,0 +1,16 @@
+CC = clang
+CFLAGS =				\
+	-ffreestanding		\
+	-nostdlib			\
+	-nostdinc			\
+	-mno-red-zone		\
+	-mno-sse			\
+	-mno-sse2			\
+	-target i386-unknown-elf
+
+.PHONY: all
+all: biosboot
+
+.PHONY: biosboot
+biosboot:
+	clang -T../mbr/link.ld $(CFLAGS) biosboot.S -o biosboot.bin
diff --git a/boot/arch/amd64/biosboot/biosboot.S b/boot/arch/amd64/biosboot/biosboot.S
new file mode 100644
index 0000000..717d29d
--- /dev/null
+++ b/boot/arch/amd64/biosboot/biosboot.S
@@ -0,0 +1,5 @@
+    .code16
+_start:
+    cli
+    hlt
+    jmp _start
diff --git a/boot/arch/amd64/mbr/host/bootfs.sh b/boot/arch/amd64/mbr/host/bootfs.sh
index 0f20a83..ce1eccc 100755
--- a/boot/arch/amd64/mbr/host/bootfs.sh
+++ b/boot/arch/amd64/mbr/host/bootfs.sh
@@ -1,9 +1,9 @@
 #!/bin/bash
 
-mkdir -p boot_root
-echo "&" >boot_root/test.txt
-rdar -i boot_root -o bootfs.rdar
+mkdir -p boot
+mv ../biosboot/biosboot.bin boot
+rdar -i boot -o bootfs.rdar
 
 dd if=/dev/zero of=/tmp/zero count=4096 bs=1
 cat mbr.bin bootfs.rdar /tmp/zero >$GLOBAL_PROJECT_ROOT/artifacts/mbr.bin
-rm -rf boot_root/
+rm -rf boot/