not_my_default_bootloader/program.asm

[org 0x1000]

start:
	mov [bootdev], dl
	mov ah, 01h	;make cursor invisible
	mov cx, 2607h
	int 10h

	mov ah, 06h    ; Scroll up function
	xor al, al     ; Clear entire screen
	xor cx, cx     ; Upper left corner CH=row, CL=column
	mov dx, 184FH  ; lower right corner DH=row, DL=column
	mov bh, 1Eh    ; YellowOnBlue
	int 10H		; execute interrupt

	mov ah, 06h	;draw rect on background
	mov cx, 0101h
	mov dx, 124Dh
	mov bh, 3Eh
	int 10h

        mov ah, 06h     ;draw shadow
        mov cx, 1302h
        mov dx, 134Eh
        mov bh, 0Eh
        int 10h
        mov ah, 06h     ;draw shadow
        mov cx, 024Eh
        mov dx, 134Eh
        mov bh, 0Eh
        int 10h


	; menu bottom
        mov ah, 06h     ;draw rect on background
        mov cx, 1700h
        mov dx, 184Fh
        mov bh, 3Fh
        int 10h

	mov ah, 02h     ;sets cursor to top to write
        mov bh, 0h
        mov dh, 17h
        mov dl, 2h
        int 10h
	mov si, menuhelp
	call print

        mov si, menuselect
        call print

	mov si, menuexit
	call print

	mov si, menuenter
	call print

	mov ah, 02h	;sets cursor to top to write
	mov bh, 0h
	mov dh, 4h
	mov dl, 4h
	int 10h

	mov si, msg1
	call print


print_projects:
        mov ah, 02h     ;sets cursor to top to write
        mov bh, 0h
        mov dh, 6h ;row
        mov dl, 4h ;col
        int 10h

	xor bx, bx            ; Starting at offset zero
	lea di, [projects] ; RDI now has the address of the array

.loop
	mov [storebx], bx
	mov ah, 02h
	;mov bh, 0h
	add dh, 1h ;move cursor down
        mov dl, 4h;
	int 10h

	mov ax, [currentselection]
	cmp ax, bx
	jne .normalbackground
        mov ah, 06h     ;draw rect on background
        mov ch, dh
	mov cl, 4h
        mov dl, 24h
	mov bh, 7Ch
        int 10h
	jmp .drawstring

.normalbackground
	mov ah, 06h     ;draw rect on background
        mov ch, dh
        mov cl, 4h
        mov dl, 24h
        mov bh, 1Eh
        int 10h
	jmp .drawstring

.drawstring
	mov bx, [storebx]
	mov si, [di+bx]      ; Get the address of string1
	call print
        add bx, 8
	cmp bx, 48
	jne .loop

	jmp waitforkey


waitforkey:
        mov ah, 0x00
        int 0x16
        cmp ah, 1Fh
        je .up
	cmp ah, 11h
	je .down
	cmp ah, 1Ch
	je loadproject
	cmp ah, 01h
	je goback
	jmp waitforkey

.up
	mov ax, [currentselection]
        cmp ax, 40
	je .reup
	add ax, 8
        mov [currentselection], ax
        jmp print_projects

.reup
	mov ax, 0
        mov [currentselection], ax
        jmp print_projects


.down
        mov ax, [currentselection]
	cmp ax, 0
	je .redown
	sub ax, 8
        mov [currentselection], ax
        jmp print_projects

.redown
	mov ax, 40
        mov [currentselection], ax
        jmp print_projects




loadproject:
    mov bx, [currentselection]
    cmp bx, 0
    je .one
    cmp bx, 8
    je .two
    cmp bx, 16
    je .three
    cmp bx, 24
    je .four
    cmp bx, 32
    je .five
    cmp bx, 40
    je .six

    jmp waitforkey

.one
        mov bx, 0x2000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 04      ; Sector to read = 4
	jmp load
.two
        mov bx, 0x3000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 05      ; Sector to read = 4
        jmp load
.three
        mov bx, 0x4000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 06      ; Sector to read = 4
        jmp load
.four
        mov bx, 0x5000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 07      ; Sector to read = 4
        jmp load
.five
        mov bx, 0x6000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 08      ; Sector to read = 4
        jmp load
.six
        mov bx, 0x7000  ; BX = 0x1000. ES:BX=0x0:0x1000
        mov cl, 09      ; Sector to read = 4
        jmp load


load:
    pushf
    stc

    mov ah,00
    int 13h

.read_sector:
        mov ax, 0x0
        mov es, ax      ; ES = 0
                        ; ES:BX = starting address to read sector(s) in$
        mov ah, 02      ; Int 13h/AH=2 = Read Sectors From Drive;
        mov al, 0x01      ; Sectors to read = 1
        mov ch, 00      ; CH=Cylinder. Second sector of disk
                        ; is at Cylinder 0 not 1
        mov dh, 00      ; Head to read = 0

        mov dl, [bootdev]
        int 13h


        jc wolf_error
      popf
        jmp bx
        cli
        hlt



wolf_error:
        mov si, wolf_error_msg
        call print
        mov si, wolf_error_msg1
        call print
        mov ah,00
        int 16h
        xor ax,ax
        int 19h



print:
        lodsb
        or al,al
        jz exit
        mov ah,0x0e
        int 10h
        jmp print
        exit:
        ret

goback:
        mov dl, [bootdev]
        jmp 0x0:0x7c00
	hlt


msg1 db     "ARTIST   / TITLE",0

project1 db "Alex     / Poetic Software",0
project2 db "Alice    / f00d",0
project3 db "Angeliki / Voices", 0
project4 db "Joca     / Ghost in the Speaker", 0
project5 db "Tash     / Silence making", 0
project6 db "Zalan    / Phantasmagoria", 0

projects dq project1, project2, project3, project4, project5, project6

menuhelp db "F1  Help", 0
menuselect db "           W/S   Select Item",0
menuexit db 0x0D,0x0A,"  ESC Exit", 0
menuenter db "           Enter Select",0

wolf_error_msg db 'Program not found!',0x0D,0x0A,0
wolf_error_msg1 db 'Press any key to restart..',0

currentselection dw 0
storebx dw 0

bootdev         db 0x80         ; Boot device number

%assign usedMemory ($-$$)
%assign usableMemory (512*16)
%warning [usedMemory/usableMemory] Bytes used
times (512*16)-($-$$) db 0 ;kernel must have size multiple of 512 so let's pad it to the correct size