Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.
If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here.
Interrupt is already disabled here, so it is safety to update IDTR.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: "Yao, Jiewen" <jiewen.yao@intel.com>
Reviewed-by: "Ma, Maurice" <maurice.ma@intel.com>
Reviewed-by: "Mudusuru, Giri P" <giri.p.mudusuru@intel.com>
Reviewed-by: "Yarlagadda, Satya P" <satya.p.yarlagadda@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19246
6f19259b-4bc3-4df7-8a09-
765794883524
IN UINT64 Param1\r
)\r
{\r
IN UINT64 Param1\r
)\r
{\r
- return AsmExecute32BitCode (Function, Param1, 0, &mGdt);\r
+ EFI_STATUS Status;\r
+ IA32_DESCRIPTOR Idtr;\r
+\r
+ //\r
+ // Idtr might be changed inside of FSP. 32bit FSP only knows the <4G address.\r
+ // If IDTR.Base is >4G, FSP can not handle. So we need save/restore IDTR here for X64 only.\r
+ // Interrupt is already disabled here, so it is safety to update IDTR.\r
+ //\r
+ AsmReadIdtr (&Idtr);\r
+ Status = AsmExecute32BitCode (Function, Param1, 0, &mGdt);\r
+ AsmWriteIdtr (&Idtr);\r
+\r
+ return Status;\r