ARM_SMMU_TTBRn_ASID
cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid);
cb->ttbr[0] |= FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid);
cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID,
cb->ttbr[1] = FIELD_PREP(ARM_SMMU_TTBRn_ASID,
FIELD_PREP(ARM_SMMU_TTBRn_ASID, ctx->asid));