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[NTOS:KE/x64] Improve freeze code

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- Set ACTIVE flag on freeze owner like on Windows
- Add a nice state graph
- Change license to MIT
This commit is contained in:
Timo Kreuzer 2024-12-13 12:59:28 +02:00
parent a17d32a373
commit 85f42a25d5
1 changed files with 34 additions and 7 deletions
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41
ntoskrnl/ke/amd64/freeze.c
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@ -1,8 +1,30 @@
/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Processor freeze support for x64
* COPYRIGHT: Copyright 2023 Timo Kreuzer <timo.kreuzer@reactos.org>
* COPYRIGHT: Copyright 2023-2024 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
/*
IpiFrozen state graph (based on Windows behavior):
+-----------------+ Freeze request +-----------------+
| RUNNING |------------------------>| TARGET_FREEZE |
+-----------------+<--------- +-----------------+
|^ | Resume |
Freeze || Thaw +-----------+ Thaw request | Freeze IPI
v| | THAW |<-----------\ v
+-----------------+ +-----------+ +-----------------+
| OWNER + ACTIVE | ^ | FROZEN |
+-----------------+ | +-----------------+
^ | ^
| Kd proc switch | | Kd proc switch
v | v
+-----------------+ | +-----------------+
| OWNER |---------+ | FROZEN + ACTIVE |
+-----------------+ Thaw request +-----------------+
*/
/* INCLUDES *******************************************************************/
@ -98,8 +120,8 @@ KxFreezeExecution(
}
}
/* We are the owner now */
CurrentPrcb->IpiFrozen = IPI_FROZEN_STATE_OWNER;
/* We are the owner now and active */
CurrentPrcb->IpiFrozen = IPI_FROZEN_STATE_OWNER | IPI_FROZEN_FLAG_ACTIVE;
/* Loop all processors */
for (ULONG i = 0; i < KeNumberProcessors; i++)
@ -107,7 +129,7 @@ KxFreezeExecution(
PKPRCB TargetPrcb = KiProcessorBlock[i];
if (TargetPrcb != CurrentPrcb)
{
/* Nobody else is allowed to change IpiFrozen, except the freeze owner */
/* Only the active processor is allowed to change IpiFrozen */
ASSERT(TargetPrcb->IpiFrozen == IPI_FROZEN_STATE_RUNNING);
/* Request target to freeze */
@ -142,6 +164,7 @@ KxThawExecution(
VOID)
{
PKPRCB CurrentPrcb = KeGetCurrentPrcb();
ASSERT(CurrentPrcb->IpiFrozen & IPI_FROZEN_FLAG_ACTIVE);
/* Loop all processors */
for (ULONG i = 0; i < KeNumberProcessors; i++)
@ -190,6 +213,10 @@ KxSwitchKdProcessor(
/* Make sure that the processor index is valid */
ASSERT(ProcessorIndex < KeNumberProcessors);
/* We are no longer active */
ASSERT(CurrentPrcb->IpiFrozen & IPI_FROZEN_FLAG_ACTIVE);
CurrentPrcb->IpiFrozen &= ~IPI_FROZEN_FLAG_ACTIVE;
/* Inform the target processor that it's his turn now */
TargetPrcb = KiProcessorBlock[ProcessorIndex];
TargetPrcb->IpiFrozen |= IPI_FROZEN_FLAG_ACTIVE;
@ -212,12 +239,12 @@ KxSwitchKdProcessor(
{
/* Another CPU has completed, we can leave the debugger now */
KdpDprintf("[%u] KxSwitchKdProcessor: ContinueSuccess\n", KeGetCurrentProcessorNumber());
CurrentPrcb->IpiFrozen = IPI_FROZEN_STATE_OWNER;
CurrentPrcb->IpiFrozen = IPI_FROZEN_STATE_OWNER | IPI_FROZEN_FLAG_ACTIVE;
return ContinueSuccess;
}
/* We have been reselected, return to Kd to continue in the debugger */
CurrentPrcb->IpiFrozen = IPI_FROZEN_STATE_OWNER;
ASSERT(CurrentPrcb->IpiFrozen == (IPI_FROZEN_STATE_OWNER | IPI_FROZEN_FLAG_ACTIVE));
return ContinueProcessorReselected;
}