Before rewrite

boot/x86/Makefile

@@ -1,7 +1,9 @@
 all: mbrcode.bin core.img
-
+	cat mbrcode.bin core.img > disk.img
 mbrcode.bin: stage1.S
 	nasm -f bin -o $@ $^
 
-core.img: stage2/start.S
+core.img: 
-	nasm -f bin -o $@ $^
+	$(MAKE) -C stage2
+	mv stage2/core.img .
+.PHONY: core.img

boot/x86/stage2/Makefile

@@ -0,0 +1,12 @@
+CC=/opt/bin/i686-mtgos-gcc
+LD=/opt/bin/i686-mtgos-ld
+CFLAGS16=-m16
+ASFLAGS=-f elf
+core.img: start.o init.o
+	$(LD) -T stage2.ld -o core.img start.o init.o
+
+%.o: %.c
+	$(CC) $(CFLAGS16) -o $@ $^
+
+%.o: %.S
+	nasm $(ASFLAGS) -o $@ $^

boot/x86/stage2/init.c

@@ -0,0 +1,13 @@
+void putstring(short);
+void main() {
+    putstring((short)"Hello, C!\r\n");
+    putstring((short)"Goodbye, C!\r\n");
+    putstring((short)"Hello, C!\r\n");
+    putstring((short)"Goodbye, C!\r\n");
+    putstring((short)"Hello, C!\r\n");
+    putstring((short)"Goodbye, C!\r\n");
+    putstring((short)"Hello, C!\r\n");
+    putstring((short)"Goodbye, C!\r\n");
+    putstring((short)"Hello, C!\r\n");
+    putstring((short)"Goodbye, C!\r\n");
+}

boot/x86/stage2/stage2.ld

@@ -0,0 +1,18 @@
+OUTPUT_FORMAT(binary);
+SECTIONS {
+    . = 0x0;
+    .init_text :{
+        *(.init_text);    
+    }
+    .text : {
+        *(.text);
+    }
+    .data : {
+        *(.data);
+        *(.rodata);
+    }
+    .bss : {
+        *(.bss);
+        *(.end);
+    }
+}

boot/x86/stage2/start.S

@@ -1,5 +1,5 @@
-org 0x0000
 bits 16
+section .init_text
 start:
     mov ax, 0x1000 ; update segment registers
     mov ds, ax
@@ -13,27 +13,10 @@ start:
     mov si, unrealstart
     call putstr
     cli
-    push ds
-    lgdt [gdtinfo]
-    mov eax, cr0
-    or al, 1
-    mov cr0, eax ;Activate pmode
-bits 32
-    jmp $+2 ;Pls don't crash 386/486
-    mov bx, 0x08
-    mov ds, bx
-    and al, 0xFE
-    mov cr0, eax ; Turn off pmode
-bits 16
-    pop ds
-    sti
-    mov ax, 0
-    mov fs, ax
-    mov bx, 0x0f01
-    mov eax, 0x0B8000
-    mov word [fs:eax], bx
     mov si, smiley
     call putstr
+extern main
+    call main
     jmp $
 bootmsg db "Loaded MTGosloader. Checking for any open A20 gates...",13,10,0
 a20open db "It seems that A20 is already activated... Weird",13,10,0
@@ -45,6 +28,19 @@ a20success db "Successfully opened the A20 gate!",13,10,0
 unrealstart db "Trying to init unreal mode",13,10,0
 smiley db "Do you see a smiley in the top-left corner?",13,10,0
 bootdrv db 0
+global putstring
+
+putstring:
+    push bp
+    mov bp, sp
+    push si
+    push bx
+    mov si, [bp+4]
+    call putstr
+    pop bx
+    pop si
+    pop bp
+    ret
 putstr:
     lodsb
     or al, al
@@ -193,6 +189,8 @@ gdtinfo:
    dd gdt                 ;start of table
  
 gdt         dd 0,0        ; entry 0 is always unused
+flatcode    db 0xff, 0xff, 0, 0, 0, 10011010b, 10001111b, 0
 flatdesc    db 0xff, 0xff, 0, 0, 0, 10010010b, 11001111b, 0
 gdt_end:
-times 5120-($-$$) hlt
+section .end
+times 512 hlt