Initial commit

6 files changed, 93 insertions, 0 deletions

diff --git a/asm/.gitignore b/asm/.gitignore
new file mode 100644
index 0000000..d163863
--- /dev/null
+++ b/asm/.gitignore
@@ -0,0 +1 @@
+build/
\ No newline at end of file
diff --git a/asm/Makefile b/asm/Makefile
new file mode 100644
index 0000000..c05f7f4
--- /dev/null
+++ b/asm/Makefile
@@ -0,0 +1,36 @@
+arch ?= x86_64
+kernel := build/kernel-$(arch).bin
+iso := build/os-$(arch).iso
+
+linker_script := src/arch/$(arch)/linker.ld
+grub_cfg := src/arch/$(arch)/grub.cfg
+assembly_source_files := $(wildcard src/arch/$(arch)/*.asm)
+assembly_object_files := $(patsubst src/arch/$(arch)/%.asm, \
+	build/arch/$(arch)/%.o, $(assembly_source_files))
+
+.PHONY: all clean run iso
+
+all: $(kernel)
+
+clean:
+	@rm -r build
+
+run: $(iso)
+	@qemu-system-x86_64 -cdrom $(iso)
+
+iso: $(iso)
+
+$(iso): $(kernel) $(grub_cfg)
+	@mkdir -p build/isofiles/boot/grub
+	@cp $(kernel) build/isofiles/boot/kernel.bin
+	@cp $(grub_cfg) build/isofiles/boot/grub
+	@grub-mkrescue -o $(iso) build/isofiles 2> /dev/null
+
+$(kernel): $(assembly_object_files) $(linker_script)
+	@ld -n -T $(linker_script) -o $(kernel) $(assembly_object_files)
+
+# compile assembly files
+build/arch/$(arch)/%.o: src/arch/$(arch)/%.asm
+	@mkdir -p $(shell dirname $@)
+	@nasm -felf64 $< -o $@
+
diff --git a/asm/src/arch/x86_64/boot.asm b/asm/src/arch/x86_64/boot.asm
new file mode 100644
index 0000000..0a5f650
--- /dev/null
+++ b/asm/src/arch/x86_64/boot.asm
@@ -0,0 +1,18 @@
+global start
+
+section .text
+bits 32
+start:
+    ; print to the screen
+    mov dword [0xb8000], 0x2f632f49
+    mov dword [0xb8004], 0x00202f68
+    mov dword [0xb8008], 0x4f694f6c
+    mov dword [0xb800c], 0x4f624f65
+    mov dword [0xb8010], 0x00204f65
+    mov dword [0xb8014], 0x2f732f49
+    mov dword [0xb8018], 0x00202f65
+    mov dword [0xb801c], 0x00204f26
+    mov dword [0xb8020], 0x2f612f4d
+    mov dword [0xb8024], 0x2f692f72
+    mov dword [0xb8028], 0x2f732f75
+    hlt
diff --git a/asm/src/arch/x86_64/grub.cfg b/asm/src/arch/x86_64/grub.cfg
new file mode 100644
index 0000000..03f4c4a
--- /dev/null
+++ b/asm/src/arch/x86_64/grub.cfg
@@ -0,0 +1,7 @@
+set timeout=0
+set default=0
+
+menuentry "VulkanOS" {
+    multiboot2 /boot/kernel.bin
+    boot
+}
diff --git a/asm/src/arch/x86_64/linker.ld b/asm/src/arch/x86_64/linker.ld
new file mode 100644
index 0000000..5d788f1
--- /dev/null
+++ b/asm/src/arch/x86_64/linker.ld
@@ -0,0 +1,16 @@
+ENTRY(start)
+
+SECTIONS {
+    . = 1M;
+
+    .boot :
+    {
+        /* ensure that the multiboot header is at the beginning */
+        *(.multiboot_header)
+    }
+
+    .text :
+    {
+        *(.text)
+    }
+}
diff --git a/asm/src/arch/x86_64/multiboot_header.asm b/asm/src/arch/x86_64/multiboot_header.asm
new file mode 100644
index 0000000..9a9289c
--- /dev/null
+++ b/asm/src/arch/x86_64/multiboot_header.asm
@@ -0,0 +1,15 @@
+section .multiboot_header
+header_start:
+    dd 0xe85250d6                ; magic number (multiboot 2)
+    dd 0                         ; architecture 0 (protected mode i386)
+    dd header_end - header_start ; header length
+    ; checksum
+    dd 0x100000000 - (0xe85250d6 + 0 + (header_end - header_start))
+
+    ; insert optional multiboot tags here
+
+    ; required end tag
+    dw 0    ; type
+    dw 0    ; flags
+    dd 8    ; size
+header_end: