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UefiCpuPkg: Restore HpetTimer after CpuExceptionHandlerLib test

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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 <dun.tan@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Tan, Dun 2022-10-28 11:51:18 +08:00 committed by mergify[bot]
parent 99338ef81e
commit d98efb4682
2 changed files with 30 additions and 1 deletions
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1
UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerLibUnitTest.inf
View File

@ -53,6 +53,7 @@
[Protocols]
gEfiMpServiceProtocolGuid
gEfiTimerArchProtocolGuid
[Depex]
gEfiMpServiceProtocolGuid

30
UefiCpuPkg/Library/CpuExceptionHandlerLib/UnitTest/DxeCpuExceptionHandlerUnitTest.c
View File

@ -8,6 +8,7 @@
#include "CpuExceptionHandlerTest.h"
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/Timer.h>
/**
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);