- \r
-[PcdsFixedAtBuild, PcdsDynamic, PcdsDynamicEx, PcdsPatchableInModule]\r
- ## Pcd8259LegacyModeMask defines the default mask value for platform. This value is determined\r
- # 1) If platform only support pure UEFI, value should be set to 0xFFFF or 0xFFFE;\r
- # Because only clock interrupt is allowed in legacy mode in pure UEFI platform.\r
- # 2) If platform install CSM and use thunk module:\r
- # a) If thunk call provided by CSM binary requires some legacy interrupt support, the corresponding bit \r
- # should be opened as 0.\r
- # For example, if keyboard interfaces provided CSM binary use legacy keyboard interrupt in 8259 bit 2, then\r
- # the value should be set to 0xFFFC\r
- # b) If all thunk call provied by CSM binary do not require legacy interrupt support, value should be set\r
- # to 0xFFFF or 0xFFFE.\r
- #\r
- # The default value of legacy mode mask could be changed by EFI_LEGACY_8259_PROTOCOL->SetMask(). But it is rarely\r
- # need change it except some special cases such as when initializing the CSM binary, it should be set to 0xFFFF to \r
- # mask all legacy interrupt. Please restore the original legacy mask value if changing is made for these special case.\r
- #\r
- gPcAtChipsetPkgTokenSpaceGuid.Pcd8259LegacyModeMask|0xFFFF|UINT16|0x00000001\r
- \r
- ## Pcd8259LegacyModeEdgeLevel defines the default edge level for legacy mode's interrrupt controller.\r
- gPcAtChipsetPkgTokenSpaceGuid.Pcd8259LegacyModeEdgeLevel|0x0000|UINT16|0x00000002\r
-\r
- ## This PCD specifies whether we need enable IsaAcpiCom1 device.\r
- gPcAtChipsetPkgTokenSpaceGuid.PcdIsaAcpiCom1Enable|TRUE|BOOLEAN|0x00000003\r