when gBS->ExitBootServices() is called, the APs should avoid to access
the unsafed buff datas which were allocated by boot services.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen Fan <chen.fan.f...@cn.fujitsu.com>
Tested-by: Gabriel Somlo <so...@cmu.edu>
Reviewed-by: Jordan Justen <jordan.l.jus...@intel.com>
---
v2-v1:
Move creating Exit callback into InitializeMpSupport()
UefiCpuPkg/CpuDxe/CpuMp.c | 34 +++++++++++++++++++++++++++++++++-
1 file changed, 33 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.c b/UefiCpuPkg/CpuDxe/CpuMp.c
index f864de1..b65300c 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.c
+++ b/UefiCpuPkg/CpuDxe/CpuMp.c
@@ -20,7 +20,8 @@ UINTN gApStackSize;
UINTN gPollInterval = 100; // 100 microseconds
MP_SYSTEM_DATA mMpSystemData;
-EFI_HANDLE mMpServiceHandle = NULL;
+EFI_HANDLE mMpServiceHandle = NULL;
+EFI_EVENT mExitBootServicesEvent = (EFI_EVENT)NULL;
VOID *mCommonStack = 0;
VOID *mTopOfApCommonStack = 0;
@@ -1465,6 +1466,28 @@ InitMpSystemData (
}
/**
+ Callback function for ExitBootServices.
+
+ @param Event Event whose notification function is being
invoked.
+ @param Context The pointer to the notification function's
context,
+ which is implementation-dependent.
+
+**/
+VOID
+EFIAPI
+ExitBootServicesCallback (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ //
+ // Avoid APs access invalid buff datas which allocated by BootServices,
+ // so we send INIT IPI to APs to let them wait for SIPI state.
+ //
+ SendInitIpiAllExcludingSelf ();
+}
+
+/**
Initialize Multi-processor support.
**/
@@ -1531,4 +1554,13 @@ InitializeMpSupport (
(gMaxLogicalProcessorNumber -
mMpSystemData.NumberOfProcessors) *
gApStackSize));
}
+
+ Status = gBS->CreateEvent (
+ EVT_SIGNAL_EXIT_BOOT_SERVICES,
+ TPL_CALLBACK,
+ ExitBootServicesCallback,
+ NULL,
+ &mExitBootServicesEvent
+ );
+ ASSERT_EFI_ERROR (Status);
}
--
1.9.3
------------------------------------------------------------------------------
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