AHCI_CMD_TBL_HDR_SZ
struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
AHCI_CMD_TBL_SZ = AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16),
struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
#define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
#define CMD_DMA_ALLOC_SZ (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)