ref: 2bb0f44eba0775af5e7ce1a73d15a7abf958c13f
dir: /sys/src/9/lx2k/io.h/
enum {
IRQfiq = -1,
PPI = 16,
SPI = 32,
IRQcntps = PPI+13,
IRQcntpns = PPI+14,
IRQuart = SPI+32,
IRQusb1 = SPI+80,
IRQusb2 = SPI+81,
IRQpci3 = SPI+119,
IRQpci5 = SPI+129,
};
#define BUSUNKNOWN (-1)
#define PCIWINDOW 0
#define PCIWADDR(x) (PADDR(x)+PCIWINDOW)