ref: 254b07675e1a5348f2a8723f55e6b5b1b18a4721
dir: /os/boot/puma/outb.c/
typedef unsigned short ushort;
typedef unsigned char uchar;
enum {
IsaIOBase = 0xf0000000,
IsaMemBase = 0xe0000000,
IOBase = 0x300,
MemBase = 0xc0000,
TxFrame = 0x0a00,
};
#define regw(reg, val) *((ushort *)IsaMemBase + MemBase + (reg)) = (val)
void
main(void)
{
regw(TxFrame, 0x1234);
}