[Patch v5 21/48] UefiCpuPkg/MpInitLib: Fill MP_CPU_EXCHANGE_INFO fields


Jeff Fan <jeff.fan@...>
 

FillExchangeInfoData() is used to fill MP_CPU_EXCHANGE_INFO date exchanged
between C code and assembly code of AP reset vector.

v5:
1. Reference ApWakeupFunction instead of ApCFunction.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@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 a4a2c44..d081111 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -17,6 +17,47 @@
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
@@ -407,6 +448,44 @@ ApWakeupFunction (
}

/**
+ 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) ApWakeupFunction;
+ 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

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