[PATCH 2/5] ntoskrnl.exe: Implement KeAreApcsDisabled using critical region functions.

[Derek Lesho]

Signed-off-by: Derek Lesho 
---
 dlls/ntoskrnl.exe/ntoskrnl.c         | 16 ++++++++++++++--
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec  |  2 +-
 dlls/ntoskrnl.exe/ntoskrnl_private.h |  1 +
 include/ddk/ntddk.h                  |  1 +
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 0ab150ea65..6bcd19c78f 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -2484,6 +2484,8 @@ static void *create_thread_object( HANDLE handle )
     if (!NtQueryInformationThread( handle, ThreadBasicInformation, &info, sizeof(info), NULL ))
         thread->id = info.ClientId;

+    thread->critical_region_count = 0;
+
     return thread;
 }

@@ -3382,7 +3384,8 @@ NTSTATUS WINAPI IoCsqInitialize(PIO_CSQ csq, PIO_CSQ_INSERT_IRP insert_irp, PIO_
  */
 void WINAPI KeEnterCriticalRegion(void)
 {
-    FIXME(": stub\n");
+    TRACE(": semi-stub\n");
+    KeGetCurrentThread()->critical_region_count++;
 }

/***********************************************************************
@@ -3390,7 +3393,8 @@ void WINAPI KeEnterCriticalRegion(void)
  */
 void WINAPI KeLeaveCriticalRegion(void)
 {
-    FIXME(": stub\n");
+    TRACE(": semi-stub\n");
+    KeGetCurrentThread()->critical_region_count--;
 }

/***********************************************************************
@@ -4322,3 +4326,11 @@ ULONG WINAPI ExSetTimerResolution(ULONG time, BOOLEAN set_resolution)
     FIXME("stub: %u %d\n", time, set_resolution);
     return KeQueryTimeIncrement();
 }
+
+/*********************************************************************
+ *           KeAreApcsDisabled    (NTOSKRNL.@)
+ */
+BOOLEAN WINAPI KeAreApcsDisabled(void)
+{
+    return !!KeGetCurrentThread()->critical_region_count;
+}
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index f965ff55ec..e485a04da1 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -521,7 +521,7 @@
 @ stdcall KeAcquireSpinLockAtDpcLevel(ptr)
 @ stdcall -arch=arm,arm64,x86_64 KeAcquireSpinLockRaiseToDpc(ptr)
 @ stub KeAddSystemServiceTable
-@ stub KeAreApcsDisabled
+@ stdcall KeAreApcsDisabled()
 @ stub KeAttachProcess
 @ stub KeBugCheck
 @ stub KeBugCheckEx
diff --git a/dlls/ntoskrnl.exe/ntoskrnl_private.h b/dlls/ntoskrnl.exe/ntoskrnl_private.h
index f5a76284cb..19c287c151 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl_private.h
+++ b/dlls/ntoskrnl.exe/ntoskrnl_private.h
@@ -32,6 +32,7 @@ struct _KTHREAD
 {
     DISPATCHER_HEADER header;
     CLIENT_ID id;
+    unsigned int critical_region_count;
 };

void *alloc_kernel_object( POBJECT_TYPE type, HANDLE handle, SIZE_T size, LONG ref ) DECLSPEC_HIDDEN;
diff --git a/include/ddk/ntddk.h b/include/ddk/ntddk.h
index 719ba67c6a..f09f879032 100644
--- a/include/ddk/ntddk.h
+++ b/include/ddk/ntddk.h
@@ -213,6 +213,7 @@ NTSTATUS  WINAPI IoQueryDeviceDescription(PINTERFACE_TYPE,PULONG,PCONFIGURATION_
                                   PCONFIGURATION_TYPE,PULONG,PIO_QUERY_DEVICE_ROUTINE,PVOID);
 void      WINAPI IoRegisterDriverReinitialization(PDRIVER_OBJECT,PDRIVER_REINITIALIZE,PVOID);
 NTSTATUS  WINAPI IoRegisterShutdownNotification(PDEVICE_OBJECT);
+BOOLEAN   WINAPI KeAreApcsDisabled(void);
 NTSTATUS  WINAPI KeExpandKernelStackAndCallout(PEXPAND_STACK_CALLOUT,void*,SIZE_T);
 void      WINAPI KeSetTargetProcessorDpc(PRKDPC,CCHAR);
 BOOLEAN   WINAPI MmIsAddressValid(void *);