first commit

.gitignore

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+ros.img

Makefile

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+FLOPPY 		= ros.img
+SRC_FILES 	= $(cd src && shell find -L * -type f -name '*.asm')
+
+$(FLOPPY): Makefile $(SRC_FILES)
+	nasm stage1.asm -o $(FLOPPY)
+
+run: $(FLOPPY)
+	qemu-system-i386 -fda $(FLOPPY) -boot a -enable-kvm -cpu host -m 512M

hcf.asm

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+hcf:
+        cli
+.loop:
+        hlt
+        jmp .loop

stage1.asm

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+org 0x7c00
+jmp main
+
+%include "hcf.asm"
+
+main:
+        mov ax, msg_checking
+        call puts
+
+        mov ah, 0 ; reset disk
+        mov dl, 0 ; disk A
+        int 0x13
+        jc .fail
+        jmp .success
+.fail:
+        mov ax, msg_fail
+        call puts
+        jmp hcf
+
+.success:
+        mov ax, msg_success
+        call puts
+        
+        mov ah, 0x2 ; read sectors
+        mov al, 0x2 ; sector count
+        mov ch, 0x0 ; cylind
+        mov cl, 0x2 ; sector index
+        mov dh, 0x0 ; head
+        mov dl, 0x0 ; disk A
+
+        mov bx, 0
+        mov es, bx
+        mov bx, stage2
+        int 0x13
+        jmp stage2
+
+puts:
+        push bx
+        push di
+
+        mov bx, ax
+
+        mov ah, 0xE
+        mov di, 0
+.loop:
+        mov al, [bx + di]
+        
+        cmp al, 0
+        je .exit
+        int 0x10
+        
+        cmp al, 0xA
+        jne .skip
+        mov al, 0xD
+        int 0x10
+.skip:
+        inc di
+        jmp .loop
+.exit:
+        pop di
+        pop bx
+        ret
+
+msg_checking: db "Checking that Floppy Disk A is mounted... ", 0
+msg_success: db "success!", 0xA, 0
+msg_fail: db "fail!", 0xA, 0
+
+times 510 - ($-$$) db 0
+db 0x55, 0xaa
+
+%include "stage2.asm"

stage2.asm

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+stage2:
+        mov ax, msg_loaded
+        call puts
+
+msg_loaded: db "Loaded!"