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SourceLevelDebugPkg/SecPeiDebugAgentLib: Restore CPU interrupt state 

In DEBUG_AGENT_INIT_POSTMEM_SEC case, caller may disable/restore CPU interrupt
to protect the stack/heap migration. SecPeiDebugAgentLib cannot always enable
CPU interrupt. Otherwise system may crash during stack/heap migration.
SecPeiDebugAgentLib should restore original CPU interrupt state in
DEBUG_AGENT_INIT_POSTMEM_SEC case.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Brian J. Johnson <bjohnson@sgi.com>
Tested-by: Brian J. Johnson <bjohnson@sgi.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17916 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Jeff Fan 2015-07-10 05:48:19 +00:00 committed by vanjeff
parent db42930da9
commit 2638c11107
1 changed files with 19 additions and 10 deletions
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29
SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c
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@ -376,8 +376,12 @@ InitializeDebugAgent (
UINT64 *MailboxLocationPointer;
EFI_PHYSICAL_ADDRESS Address;
UINT32 DebugTimerFrequency;
BOOLEAN CpuInterruptState;
DisableInterrupts ();
//
// Disable interrupts and save current interrupt state
//
CpuInterruptState = SaveAndDisableInterrupts();
switch (InitFlag) {
@ -611,17 +615,22 @@ InitializeDebugAgent (
break;
}
//
// Enable Debug Timer interrupt. In post-memory SEC, the caller enables it.
//
if (InitFlag != DEBUG_AGENT_INIT_POSTMEM_SEC) {
if (InitFlag == DEBUG_AGENT_INIT_POSTMEM_SEC) {
//
// Restore CPU Interrupt state and keep debug timer interrupt state as is
// in DEBUG_AGENT_INIT_POSTMEM_SEC case
//
SetInterruptState (CpuInterruptState);
} else {
//
// Enable Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (TRUE);
//
// Enable CPU interrupts so debug timer interrupts can be delivered
//
EnableInterrupts ();
}
//
// Enable CPU interrupts so debug timer interrupts can be delivered
//
EnableInterrupts ();
//
// If Function is not NULL, invoke it always whatever debug agent was initialized sucesssfully or not.
//