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#define PCI_EXP_TYPE_DOWNSTREAM 0x6 /* Downstream Port */
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#define PCI_EXP_TYPE_PCI_BRIDGE 0x7 /* PCI/PCI-X Bridge */
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#define PCI_EXP_TYPE_RC_END 0x9 /* Root Complex Integrated Endpoint */
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#define PCI_EXP_FLAGS_SLOT 0x0100 /* Slot implemented */
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#define PCI_EXP_FLAGS_IRQ 0x3e00 /* Interrupt message number */
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#define PCI_EXP_DEVCAP 4 /* Device capabilities */