VR_CAM_MASK
VR_PUT32(vrp->acc_reg, VR_CAM_MASK, 0);
VR_PUT32(vrp->acc_reg, VR_CAM_MASK, 1);
cam_mask = VR_GET32(vrp->acc_reg, VR_CAM_MASK);
VR_PUT32(vrp->acc_reg, VR_CAM_MASK, cam_mask);
VR_PUT32(vrp->acc_reg, VR_CAM_MASK, cam_mask);
mask = VR_GET32(vrp->acc_reg, VR_CAM_MASK);