NVME_REG_CAP
fdev->cap_reg = readq(fdev->bar + NVME_REG_CAP);
*(u64 *)(buf + NVME_REG_CAP) = readq(bar + NVME_REG_CAP);
anv->ctrl.cap = readq(anv->mmio_nvme + NVME_REG_CAP);
ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
ret = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
dev->ctrl.cap = lo_hi_readq(dev->bar + NVME_REG_CAP);
case NVME_REG_CAP:
nvmet_pci_epf_bar_write64(ctrl, NVME_REG_CAP, ctrl->cap);
u32 cap = readl(bar + NVME_REG_CAP);