FEATURE_GFX_ULV_BIT
#define FEATURE_GFX_ULV_MASK (1 << FEATURE_GFX_ULV_BIT )
*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_GFX_ULV_BIT);
*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_GFX_ULV_BIT);
*(uint64_t *)feature_mask &= ~FEATURE_MASK(FEATURE_GFX_ULV_BIT);
*(uint64_t *)feature_mask |= FEATURE_MASK(FEATURE_GFX_ULV_BIT);
*(uint64_t *)feature_mask &= ~FEATURE_MASK(FEATURE_GFX_ULV_BIT);