HelenOS sources

mbox_read          74 kernel/genarch/src/drivers/bcm2835/mbox.c 	mbox_read((bcm2835_mbox_t *)BCM2835_MBOX0_ADDR,
mbox_read         110 kernel/genarch/src/drivers/bcm2835/mbox.c 	if (mbox_read(fb_mbox, MBOX_CHAN_FB)) {
mbox_read         149 kernel/genarch/src/drivers/bcm2835/mbox.c 	mbox_read(mbox, MBOX_CHAN_PROP_A2V);
HelenOS homepage, sources at GitHub