GDT_SG_SZ
GDT_CACHE_SG_LST + i * GDT_SG_SZ +
GDT_CACHE_SG_LST + i * GDT_SG_SZ +
sg_canz * GDT_SG_SZ + GDT_SG_LEN, 0);
roundup(GDT_CMD_UNION + GDT_CACHE_SG_LST + sg_canz * GDT_SG_SZ,
#define GDT_CACHE_SZ (0x12 + GDT_MAXSG * GDT_SG_SZ)
#define GDT_RAW_SZ (0x3e + GDT_MAXSG * GDT_SG_SZ)