===== GUEST (root): dmesg + static-value match =====
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa1
            vga0
                I/O ports:
                    0x3c0-0x3df
                I/O memory addresses:
                    0xa0000-0xbffff
            lm0

===== GUEST (unprivileged): devinfo readability =====
            vga0
                I/O ports:
                    0x3c0-0x3df
                I/O memory addresses:
                    0xa0000-0xbffff
            lm0

===== HOST: structural gate — both files under one 'optional vga' =====
72:dev/video/fb/vga.c			optional	vga
199:bus/isa/vga_isa.c			optional	vga