SK_XM_WRITE_4
SK_XM_WRITE_4(sc_if, XM_MODE, ctx.mode);
SK_XM_WRITE_4(sc_if, XM_MAR0, ctx.hashes[0]);
SK_XM_WRITE_4(sc_if, XM_MAR2, ctx.hashes[1]);
SK_XM_WRITE_4(sc, reg, (SK_XM_READ_4(sc, reg)) | (x))
SK_XM_WRITE_4(sc, reg, (SK_XM_READ_4(sc, reg)) & ~(x))