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#define IS_GEN4(intel) IS_GENx(intel, 4)
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#define IS_GEN5(intel) IS_GENx(intel, 5)
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#define IS_GEN6(intel) IS_GENx(intel, 6)
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/* Some chips have specific errata (or limits) that we need to workaround. */
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#define IS_I830(intel) (DEVICE_ID((intel)->PciInfo) == PCI_CHIP_I830_M)