projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 6a744d40 LE |
1 | /** @file\r |
| 2 | Library class layered on top of PciCapLib that allows clients to plug a\r | |
| 3 | PciSegmentLib backend into PciCapLib, for config space access.\r | |
| 4 | \r | |
| 5 | Copyright (C) 2018, Red Hat, Inc.\r | |
| 6 | \r | |
| b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 6a744d40 LE |
8 | **/\r |
| 9 | \r | |
| 10 | #ifndef __PCI_CAP_PCI_SEGMENT_LIB_H__\r | |
| 11 | #define __PCI_CAP_PCI_SEGMENT_LIB_H__\r | |
| 12 | \r | |
| 13 | #include <Library/PciCapLib.h>\r | |
| 14 | \r | |
| 6a744d40 LE |
15 | /**\r |
| 16 | Create a PCI_CAP_DEV object from the PCI Segment:Bus:Device.Function\r | |
| 17 | quadruplet. The config space accessors are based upon PciSegmentLib.\r | |
| 18 | \r | |
| 19 | @param[in] MaxDomain If MaxDomain is PciCapExtended, then\r | |
| 20 | PciDevice->ReadConfig() and PciDevice->WriteConfig()\r | |
| 21 | will delegate extended config space accesses too to\r | |
| 22 | PciSegmentReadBuffer() and PciSegmentWriteBuffer(),\r | |
| 23 | respectively. Otherwise, PciDevice->ReadConfig() and\r | |
| 24 | PciDevice->WriteConfig() will reject accesses to\r | |
| 25 | extended config space with RETURN_UNSUPPORTED, without\r | |
| 26 | calling PciSegmentReadBuffer() or\r | |
| 27 | PciSegmentWriteBuffer(). By setting MaxDomain to\r | |
| 28 | PciCapNormal, the platform can prevent undefined\r | |
| 29 | PciSegmentLib behavior when the PCI root bridge under\r | |
| 30 | the PCI device at Segment:Bus:Device.Function doesn't\r | |
| 31 | support extended config space.\r | |
| 32 | \r | |
| 33 | @param[in] Segment 16-bit wide segment number.\r | |
| 34 | \r | |
| 35 | @param[in] Bus 8-bit wide bus number.\r | |
| 36 | \r | |
| 37 | @param[in] Device 5-bit wide device number.\r | |
| 38 | \r | |
| 39 | @param[in] Function 3-bit wide function number.\r | |
| 40 | \r | |
| 41 | @param[out] PciDevice The PCI_CAP_DEV object constructed as described above.\r | |
| 42 | PciDevice can be passed to the PciCapLib APIs.\r | |
| 43 | \r | |
| 44 | @retval RETURN_SUCCESS PciDevice has been constructed and output.\r | |
| 45 | \r | |
| 46 | @retval RETURN_INVALID_PARAMETER Device or Function does not fit in the\r | |
| 47 | permitted number of bits.\r | |
| 48 | \r | |
| 49 | @retval RETURN_OUT_OF_RESOURCES Memory allocation failed.\r | |
| 50 | **/\r | |
| 51 | RETURN_STATUS\r | |
| 52 | EFIAPI\r | |
| 53 | PciCapPciSegmentDeviceInit (\r | |
| ac0a286f MK |
54 | IN PCI_CAP_DOMAIN MaxDomain,\r |
| 55 | IN UINT16 Segment,\r | |
| 56 | IN UINT8 Bus,\r | |
| 57 | IN UINT8 Device,\r | |
| 58 | IN UINT8 Function,\r | |
| 59 | OUT PCI_CAP_DEV **PciDevice\r | |
| 6a744d40 LE |
60 | );\r |
| 61 | \r | |
| 6a744d40 LE |
62 | /**\r |
| 63 | Free the resources used by PciDevice.\r | |
| 64 | \r | |
| 65 | @param[in] PciDevice The PCI_CAP_DEV object to free, originally produced by\r | |
| 66 | PciCapPciSegmentDeviceInit().\r | |
| 67 | **/\r | |
| 68 | VOID\r | |
| 69 | EFIAPI\r | |
| 70 | PciCapPciSegmentDeviceUninit (\r | |
| ac0a286f | 71 | IN PCI_CAP_DEV *PciDevice\r |
| 6a744d40 LE |
72 | );\r |
| 73 | \r | |
| 74 | #endif // __PCI_CAP_PCI_SEGMENT_LIB_H__\r |