[reactos] 06/06: [NTOS:KE] Write a basic kernel mode test for FPU Save/Restore mechanism

[George Bișoc]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b922b6d7fc9cd8988d62a…

commit b922b6d7fc9cd8988d62a32e2c62decdde8ec901
Author:     George Bișoc <george.bisoc(a)reactos.org>
AuthorDate: Tue Jan 25 13:20:05 2022 +0100
Commit:     George Bișoc <george.bisoc(a)reactos.org>
CommitDate: Tue May 24 18:39:46 2022 +0200

    [NTOS:KE] Write a basic kernel mode test for FPU Save/Restore mechanism
---
 modules/rostests/kmtests/CMakeLists.txt            |  1 +
 modules/rostests/kmtests/kmtest_drv/testlist.c     |  2 +
 .../rostests/kmtests/ntos_ke/KeFloatPointState.c   | 47 ++++++++++++++++++++++
 3 files changed, 50 insertions(+)

diff --git a/modules/rostests/kmtests/CMakeLists.txt
b/modules/rostests/kmtests/CMakeLists.txt
index 588dd3d74c9..3561248f6eb 100644
--- a/modules/rostests/kmtests/CMakeLists.txt
+++ b/modules/rostests/kmtests/CMakeLists.txt
@@ -74,6 +74,7 @@ list(APPEND KMTEST_DRV_SOURCE
     ntos_ke/KeDevQueue.c
     ntos_ke/KeDpc.c
     ntos_ke/KeEvent.c
+    ntos_ke/KeFloatPointState.c
     ntos_ke/KeGuardedMutex.c
     ntos_ke/KeIrql.c
     ntos_ke/KeMutex.c
diff --git a/modules/rostests/kmtests/kmtest_drv/testlist.c
b/modules/rostests/kmtests/kmtest_drv/testlist.c
index c9c37818ac5..60352b26a83 100644
--- a/modules/rostests/kmtests/kmtest_drv/testlist.c
+++ b/modules/rostests/kmtests/kmtest_drv/testlist.c
@@ -39,6 +39,7 @@ KMT_TESTFUNC Test_KeApc;
 KMT_TESTFUNC Test_KeDeviceQueue;
 KMT_TESTFUNC Test_KeDpc;
 KMT_TESTFUNC Test_KeEvent;
+KMT_TESTFUNC Test_KeFloatPointState;
 KMT_TESTFUNC Test_KeGuardedMutex;
 KMT_TESTFUNC Test_KeIrql;
 KMT_TESTFUNC Test_KeMutex;
@@ -119,6 +120,7 @@ const KMT_TEST TestList[] =
     { "KeDeviceQueue",                      Test_KeDeviceQueue },
     { "KeDpc",                              Test_KeDpc },
     { "KeEvent",                            Test_KeEvent },
+    { "KeFloatPointState",                  Test_KeFloatPointState },
     { "KeGuardedMutex",                     Test_KeGuardedMutex },
     { "KeIrql",                             Test_KeIrql },
     { "KeMutex",                            Test_KeMutex },
diff --git a/modules/rostests/kmtests/ntos_ke/KeFloatPointState.c
b/modules/rostests/kmtests/ntos_ke/KeFloatPointState.c
new file mode 100644
index 00000000000..9f229f52f54
--- /dev/null
+++ b/modules/rostests/kmtests/ntos_ke/KeFloatPointState.c
@@ -0,0 +1,47 @@
+/*
+ * PROJECT:     ReactOS kernel-mode tests
+ * LICENSE:     GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
+ * PURPOSE:     Kernel mode tests for Save/Restore FPU state API kernel support
+ * COPYRIGHT:   Copyright 2022 George Bișoc <george.bisoc(a)reactos.org>
+ */
+
+#include <kmt_test.h>
+
+START_TEST(KeFloatPointState)
+{
+    NTSTATUS Status;
+    KFLOATING_SAVE FloatSave;
+    KIRQL Irql;
+
+    /* Save the state under normal conditions */
+    Status = KeSaveFloatingPointState(&FloatSave);
+    ok_irql(PASSIVE_LEVEL);
+    ok_eq_hex(Status, STATUS_SUCCESS);
+
+    /* Restore the FPU state back */
+    KeRestoreFloatingPointState(&FloatSave);
+
+    /* Try to raise the IRQL to APC and do some operations again */
+    KeRaiseIrql(APC_LEVEL, &Irql);
+
+    /* Save the state under APC_LEVEL interrupt */
+    Status = KeSaveFloatingPointState(&FloatSave);
+    ok_irql(APC_LEVEL);
+    ok_eq_hex(Status, STATUS_SUCCESS);
+
+    /* Restore the FPU state back */
+    KeRestoreFloatingPointState(&FloatSave);
+
+    /* Try to raise the IRQL to dispatch this time */
+    KeLowerIrql(Irql);
+    KeRaiseIrql(DISPATCH_LEVEL, &Irql);
+
+    /* Save the state under DISPATCH_LEVEL interrupt */
+    Status = KeSaveFloatingPointState(&FloatSave);
+    ok_irql(DISPATCH_LEVEL);
+    ok_eq_hex(Status, STATUS_SUCCESS);
+
+    /* We're done */
+    KeRestoreFloatingPointState(&FloatSave);
+    KeLowerIrql(Irql);
+}