Initial commit

.gitignore

@@ -0,0 +1,5 @@
+/**/*.o
+/**/*.bin
+/**/*.img
+/bochsout.txt
+/bx_enh_dbg.ini

Makefile

@@ -0,0 +1,40 @@
+CC = gcc
+LD = ld
+
+CFLAGS = -O2 -pipe -Wall -Wextra
+
+INTERNAL_CFLAGS = \
+	-m16 \
+	-ffreestanding \
+	-nostdlib \
+	-masm=intel \
+	-fno-pic \
+	-mno-sse \
+	-mno-sse2 \
+	-ffreestanding \
+	-fno-stack-protector \
+	-I.
+
+LDFLAGS =
+
+INTERNAL_LDFLAGS = \
+	-m elf_i386 \
+	-nostdlib \
+	-Tlinker.ld
+
+.PHONY: all clean
+
+C_FILES := $(shell find ./ -type f -name '*.c')
+OBJ := $(C_FILES:.c=.o)
+
+all: qloader2.bin
+
+qloader2.bin: $(OBJ)
+	$(LD) $(LDFLAGS) $(INTERNAL_LDFLAGS) $(OBJ) -o $@
+
+%.o: %.c
+	$(CC) $(CFLAGS) $(INTERNAL_CFLAGS) -c $< -o $@
+
+clean:
+	rm -f $(OBJ)
+

bochsrc

@@ -0,0 +1,17 @@
+cpu: count=2, reset_on_triple_fault=0
+
+display_library: x, options="gui_debug"
+
+megs: 512
+
+clock: sync=realtime, time0=local
+
+ata0-master: type=disk, path="qloader2.img", mode=flat
+
+boot: c
+
+log: ./bochsout.txt
+
+mouse: enabled=0
+
+magic_break: enabled=1

linker.ld

@@ -0,0 +1,21 @@
+OUTPUT_FORMAT(binary)
+ENTRY(main)
+
+SECTIONS
+{
+	. = 0x7c00;
+
+    .text : {
+        bootsect_begin = .;
+        KEEP(*(.early_boot*))
+        KEEP(*(.text*))
+    }
+
+    .data : {
+        KEEP(*(.data*))
+        KEEP(*(.bss*))
+        . += 510 - (. - bootsect_begin);
+        SHORT(0xaa55)
+    }
+
+}

main.c

@@ -0,0 +1,37 @@
+asm (
+    ".section .early_boot\n\t"
+    "cli\n\t"
+    "jmp 0x0:1f\n\t"
+    "1:\n\t"
+    "xor ax, ax\n\t"
+    "mov ds, ax\n\t"
+    "mov es, ax\n\t"
+    "mov fs, ax\n\t"
+    "mov gs, ax\n\t"
+    "mov ss, ax\n\t"
+    "mov sp, 0x7c00\n\t"
+    "xor dh, dh\n\t"
+    "push edx\n\t"
+    "call main\n\t"
+);
+
+void bios_print(const char *str) {
+    asm (
+        "1:\n\t"
+        "lodsb\n\t"
+        "test al, al\n\t"
+        "jz 2f\n\t"
+        "int 0x10\n\t"
+        "jmp 1b\n\t"
+        "2:\n\t"
+        :
+        : "a"(0x0e00), "S"(str)
+        : "cc", "memory"
+    );
+}
+
+void main(int boot_drive) {
+    // TODO
+    bios_print("hello world from qloader2");
+    for (;;);
+}