MBOX_SIZE
size = MBOX_SIZE;
DRIVER_NAME, ddiinst, (int)sizeof (MAILBOX), MBOX_SIZE);
#define SLI2_SLIM2_SIZE (MBOX_SIZE + MBOX_EXTENSION_SIZE + \
#define SLI3_SLIM2_SIZE (MBOX_SIZE + MBOX_EXTENSION_SIZE + \
#define MBOX_EXTENSION_OFFSET MBOX_SIZE