mkdir ~/bochs-m4 && cd ~/bochs-m4 && clear

# =======================================================================
# BOOTLOADER hello.asm (16-bit real-mode, BIOS int 0x10)
# =======================================================================
cat > hello.asm << 'EOF'
[BITS 16]
[ORG 0x7C00]

start:
    xor ax, ax           ; Zero segment registers
    mov ds, ax
    mov es, ax
    mov si, msg          ; SI = pointer na zprávu

print_loop:
    lodsb                ; AL = [SI++]
    cmp al, 0            ; konec stringu?
    je hlt_loop
    mov ah, 0x0E         ; Teletype BIOS funkce
    int 0x10             ; Vypis znak
    jmp print_loop

hlt_loop:
    hlt                  ; Zastav CPU
    jmp hlt_loop

msg: db 'Hello M4 Bochs v2026!', 0
times 510-($-$$) db 0
dw 0xAA55                 ; Boot signature (povinné!)
EOF

# =======================================================================
# KOMPILACE + 1.44MB FLOPPY IMAGE
# =======================================================================
nasm -f bin hello.asm -o hello.bin
dd if=/dev/zero of=boot.img bs=512 count=2880    # Plný floppy
dd if=hello.bin of=boot.img bs=512 count=1 conv=notrunc
echo "✅ Boot signature: $(hexdump -C boot.img | tail -1)"

# =======================================================================
# BOCHS 3.0 CESTY (Homebrew Apple Silicon M4)
# =======================================================================
VGA_PATH="/opt/homebrew/Cellar/bochs/3.0/share/bochs/VGABIOS-lgpl-latest.bin"
BIOS_PATH="/opt/homebrew/Cellar/bochs/3.0/share/bochs/BIOS-bochs-latest"
echo "✅ VGABIOS: $VGA_PATH"
echo "✅ BIOS:   $BIOS_PATH"
ls -la "$VGA_PATH" "$BIOS_PATH"

# =======================================================================
# BOCHSRC CONFIG (SDL2 GUI + rychlost)
# =======================================================================
cat > bochsrc << EOF
# Memory + CPU
megs: 32
cpu: count=1, ips=20000000

# Display (SDL2 GUI okno)
display_library: sdl2

# ROM images (Homebrew M4 paths)
romimage: file="$BIOS_PATH"
vgaromimage: file="$VGA_PATH"

# Boot floppy
boot: floppy
floppya: 1_44=boot.img, status=inserted

# Keyboard + log
keyboard: type=mf
log: bochsout.txt
EOF

echo "✅ VŠE PŘIPRAVENO! 🚀"
ls -la *.asm *.bin *.img bochsrc
echo "START: bochs -f bochsrc -q"