diff options
| author | Jeff Fan <jeff.fan@intel.com> | 2015-07-10 05:48:19 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@Edk2> | 2015-07-10 05:48:19 +0000 |
| commit | 2638c111076f9a49d4766ca5acbafa0eb7f66a18 (patch) | |
| tree | 3b145d7f5f67a4aa4d2e80a43343d72ded48bd69 /SourceLevelDebugPkg | |
| parent | db42930da9c6e32875b4aec1fff3866be0c0ae96 (diff) | |
| download | edk2-platforms-2638c111076f9a49d4766ca5acbafa0eb7f66a18.tar.xz | |
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
Diffstat (limited to 'SourceLevelDebugPkg')
| -rw-r--r-- | SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c index 09216c20fe..faec574fa4 100644 --- a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c +++ b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgent/SecPeiDebugAgentLib.c @@ -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) {
@@ -611,18 +615,23 @@ 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.
//
if (Function != NULL) {
|