mirror of https://github.com/acidanthera/audk.git
02b9a8343f
Add a library class, and a UEFI_DRIVER lib instance, that are layered on
top of PciCapLib, and allow clients to plug an EFI_PCI_IO_PROTOCOL backend
into PciCapLib, for config space access.
(Side note:
Although the UEFI spec says that EFI_PCI_IO_PROTOCOL_CONFIG() returns
EFI_UNSUPPORTED if "[t]he address range specified by Offset, Width, and
Count is not valid for the PCI configuration header of the PCI
controller", this patch doesn't directly document the EFI_UNSUPPORTED
error code, for ProtoDevTransferConfig() and its callers
ProtoDevReadConfig() and ProtoDevWriteConfig(). Instead, the patch refers
to "unspecified error codes". The reason is that in edk2, the
PciIoConfigRead() and PciIoConfigWrite() functions [1] can also return
EFI_INVALID_PARAMETER for the above situation.
Namely, PciIoConfigRead() and PciIoConfigWrite() first call
PciIoVerifyConfigAccess(), which indeed produces the standard
EFI_UNSUPPORTED error code, if the device's config space is exceeded.
However, if PciIoVerifyConfigAccess() passes, and we reach
RootBridgeIoPciRead() and RootBridgeIoPciWrite() [2], then
RootBridgeIoCheckParameter() can still fail, e.g. if the root bridge
doesn't support extended config space (see commit
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|---|---|---|
| .. | ||
| AcpiTimerLib | ||
| BaseMemEncryptSevLib | ||
| BasePciCapLib | ||
| BasePciCapPciSegmentLib | ||
| DxePciLibI440FxQ35 | ||
| EmuVariableFvbLib | ||
| LoadLinuxLib | ||
| LockBoxLib | ||
| NvVarsFileLib | ||
| PciHostBridgeLib | ||
| PlatformBootManagerLib | ||
| PlatformDebugLibIoPort | ||
| PlatformFvbLibNull | ||
| PlatformHasIoMmuLib | ||
| PlatformSecureLib | ||
| QemuBootOrderLib | ||
| QemuFwCfgLib | ||
| QemuFwCfgS3Lib | ||
| ResetSystemLib | ||
| SerializeVariablesLib | ||
| SmbiosVersionLib | ||
| SmmCpuFeaturesLib | ||
| Tcg2PhysicalPresenceLibNull | ||
| Tcg2PhysicalPresenceLibQemu | ||
| TlsAuthConfigLib | ||
| UefiPciCapPciIoLib | ||
| VirtioLib | ||
| VirtioMmioDeviceLib | ||
| XenConsoleSerialPortLib | ||
| XenHypercallLib | ||
| XenIoMmioLib | ||