From d98efb468211ab508710eac91761238e1f5c1d51 Mon Sep 17 00:00:00 2001 From: "Tan, Dun" Date: Fri, 28 Oct 2022 11:51:18 +0800 Subject: UefiCpuPkg: Restore HpetTimer after CpuExceptionHandlerLib test Disable/Restore HpetTimer before and after running the Dxe CpuExceptionHandlerLib unit test module. During the UnitTest, a new Idt is initialized for the test. There is no handler for timer intrrupt in this new idt. After the test module, HpetTimer does not work any more since the comparator value register and main counter value register for timer does not match. To fix this issue, disable/restore HpetTimer before and after Unit Test if HpetTimer driver has been dispatched. We don't need to send Apic Eoi in this unit test module.When disabling timer, after RaiseTPL(), if there is a pending timer interrupt, bit64 of Interrupt Request Register (IRR) will be set to 1 to indicate there is a pending timer interrupt. After RestoreTPL(), CPU will handle the pending interrupt in IRR.Then TimerInterruptHandler calls SendApicEoi(). Signed-off-by: Dun Tan Cc: Eric Dong Reviewed-by: Ray Ni Cc: Rahul Kumar Cc: Michael D Kinney --- .../UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf | 1 + .../UnitTest/DxeCpuExceptionHandlerUnitTest.c | 30 +++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf b/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf index e3dbe7b9ab..a904eb2504 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf @@ -53,6 +53,7 @@ [Protocols] gEfiMpServiceProtocolGuid + gEfiTimerArchProtocolGuid [Depex] gEfiMpServiceProtocolGuid diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerUnitTest.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerUnitTest.c index 917fc549bf..1cec3ed809 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerUnitTest.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerUnitTest.c @@ -8,6 +8,7 @@ #include "CpuExceptionHandlerTest.h" #include +#include /** Initialize Bsp Idt with a new Idt table and return the IA32_DESCRIPTOR buffer. @@ -162,8 +163,12 @@ CpuExceptionHandlerTestEntry ( { EFI_STATUS Status; UNIT_TEST_FRAMEWORK_HANDLE Framework; + EFI_TIMER_ARCH_PROTOCOL *TimerArchProtocol; + UINT64 TimerPeriod; - Framework = NULL; + Framework = NULL; + TimerArchProtocol = NULL; + TimerPeriod = 0; DEBUG ((DEBUG_INFO, "%a v%a\n", UNIT_TEST_APP_NAME, UNIT_TEST_APP_VERSION)); @@ -182,11 +187,34 @@ CpuExceptionHandlerTestEntry ( goto EXIT; } + // + // If HpetTimer driver has been dispatched, disable HpetTimer before Unit Test. + // + gBS->LocateProtocol (&gEfiTimerArchProtocolGuid, NULL, (VOID **)&TimerArchProtocol); + if (TimerArchProtocol != NULL) { + Status = TimerArchProtocol->GetTimerPeriod (TimerArchProtocol, &TimerPeriod); + ASSERT_EFI_ERROR (Status); + if (TimerPeriod > 0) { + DEBUG ((DEBUG_INFO, "HpetTimer has been dispatched. Disable HpetTimer.\n")); + Status = TimerArchProtocol->SetTimerPeriod (TimerArchProtocol, 0); + ASSERT_EFI_ERROR (Status); + } + } + // // Execute the tests. // Status = RunAllTestSuites (Framework); + // + // Restore HpetTimer after Unit Test. + // + if ((TimerArchProtocol != NULL) && (TimerPeriod > 0)) { + DEBUG ((DEBUG_INFO, "Restore HpetTimer after DxeCpuExceptionHandlerLib UnitTest.\n")); + Status = TimerArchProtocol->SetTimerPeriod (TimerArchProtocol, TimerPeriod); + ASSERT_EFI_ERROR (Status); + } + EXIT: if (Framework) { FreeUnitTestFramework (Framework); -- cgit v1.2.3