FillExchangeInfoData() is used to fill MP_CPU_EXCHANGE_INFO date exchanged between C code and assembly code of AP reset vector.
Cc: Michael Kinney <michael.d.kin...@intel.com> Cc: Feng Tian <feng.t...@intel.com> Cc: Giri P Mudusuru <giri.p.mudus...@intel.com> Cc: Laszlo Ersek <ler...@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jeff Fan <jeff....@intel.com> --- UefiCpuPkg/Library/MpInitLib/MpLib.c | 79 ++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c index bbf48f6..1625869 100644 --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c @@ -22,6 +22,47 @@ EFI_GUID mCpuInitMpLibHobGuid = CPU_INIT_MP_LIB_HOB_GUID; /** + The function will check if BSP Execute Disable is enabled. + DxeIpl may have enabled Execute Disable for BSP, + APs need to get the status and sync up the settings. + + @retval TRUE BSP Execute Disable is enabled. + @retval FALSE BSP Execute Disable is not enabled. +**/ +BOOLEAN +IsBspExecuteDisableEnabled ( + VOID + ) +{ + UINT32 Eax; + CPUID_EXTENDED_CPU_SIG_EDX Edx; + MSR_IA32_EFER_REGISTER EferMsr; + BOOLEAN Enabled; + + Enabled = FALSE; + AsmCpuid (CPUID_EXTENDED_FUNCTION, &Eax, NULL, NULL, NULL); + if (Eax >= CPUID_EXTENDED_CPU_SIG) { + AsmCpuid (CPUID_EXTENDED_CPU_SIG, NULL, NULL, NULL, &Edx.Uint32); + // + // CPUID 0x80000001 + // Bit 20: Execute Disable Bit available. + // + if (Edx.Bits.NX != 0) { + EferMsr.Uint64 = AsmReadMsr64 (MSR_IA32_EFER); + // + // MSR 0xC0000080 + // Bit 11: Execute Disable Bit enable. + // + if (EferMsr.Bits.NXE != 0) { + Enabled = TRUE; + } + } + } + + return Enabled; +} + +/** Get the Application Processors state. @param[in] CpuData The pointer to CPU_AP_DATA of specified AP @@ -412,6 +453,44 @@ ApCFunction ( } /** + This function will fill the exchange info structure. + + @param[in] CpuMpData Pointer to CPU MP Data + +**/ +VOID +FillExchangeInfoData ( + IN CPU_MP_DATA *CpuMpData + ) +{ + volatile MP_CPU_EXCHANGE_INFO *ExchangeInfo; + + ExchangeInfo = CpuMpData->MpCpuExchangeInfo; + ExchangeInfo->Lock = 0; + ExchangeInfo->StackStart = CpuMpData->Buffer; + ExchangeInfo->StackSize = CpuMpData->CpuApStackSize; + ExchangeInfo->BufferStart = CpuMpData->WakeupBuffer; + ExchangeInfo->ModeOffset = CpuMpData->AddressMap.ModeEntryOffset; + + ExchangeInfo->CodeSegment = AsmReadCs (); + ExchangeInfo->DataSegment = AsmReadDs (); + + ExchangeInfo->Cr3 = AsmReadCr3 (); + + ExchangeInfo->CFunction = (UINTN) ApCFunction; + ExchangeInfo->NumApsExecuting = 0; + ExchangeInfo->CpuMpData = CpuMpData; + + ExchangeInfo->EnableExecuteDisable = IsBspExecuteDisableEnabled (); + + // + // Get the BSP's data of GDT and IDT + // + AsmReadGdtr ((IA32_DESCRIPTOR *) &ExchangeInfo->GdtrProfile); + AsmReadIdtr ((IA32_DESCRIPTOR *) &ExchangeInfo->IdtrProfile); +} + +/** MP Initialize Library initialization. This service will allocate AP reset vector and wakeup all APs to do APs -- 2.7.4.windows.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel