DMAR_GCMD_REG
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd | DMA_GCMD_SIRTP, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);