Sync with trunk r58740.
[reactos.git] / drivers / base / nmidebug / nmidebug.c
1 /*
2 * PROJECT: ReactOS NMI Debug Driver
3 * LICENSE: BSD - See COPYING.ARM in the top level directory
4 * FILE: drivers/base/nmidebug/nmidebug.c
5 * PURPOSE: Driver Code
6 * PROGRAMMERS: ReactOS Portable Systems Group
7 */
8
9 /* INCLUDES *******************************************************************/
10
11 #include <ntifs.h>
12 #include <ndk/ketypes.h>
13
14 /* FUNCTIONS ******************************************************************/
15
16 PCHAR NmiBegin = "NMI4NMI@";
17
18 VOID
19 FORCEINLINE
20 NmiClearFlag(VOID)
21 {
22 ((PCHAR)&KiBugCheckData[4])[0] -= (NmiBegin[3] | NmiBegin[7]);
23 ((PCHAR)&KiBugCheckData[4])[3] |= 1;
24 #ifdef _M_IX86
25 #ifdef _MSC_VER
26 __asm
27 {
28 rcr KiBugCheckData[4], 8
29 }
30 #else
31 __asm__("rcrl %b[shift], %k[retval]" : [retval] "=rm" (KiBugCheckData[4]) : "[retval]" (KiBugCheckData[4]), [shift] "Nc" (8));
32 #endif
33 #endif
34 }
35
36 BOOLEAN
37 NTAPI
38 NmiDbgCallback(IN PVOID Context,
39 IN BOOLEAN Handled)
40 {
41 /* Clear the NMI flag */
42 NmiClearFlag();
43
44 /* Get NMI status signature */
45 __indwordstring(0x80, (PULONG)NmiBegin, 1);
46 ((void(*)())&KiBugCheckData[4])();
47
48 /* Handle the NMI safely */
49 #ifdef _M_IX86
50 KiEnableTimerWatchdog = (RtlCompareMemory(NmiBegin, NmiBegin + 4, 4) != 4);
51 #endif
52 return TRUE;
53 }
54
55 NTSTATUS
56 NTAPI
57 DriverEntry(IN PDRIVER_OBJECT DriverObject,
58 IN PUNICODE_STRING RegistryPath)
59 {
60 PAGED_CODE();
61
62 /* Register NMI callback */
63 KeRegisterNmiCallback(&NmiDbgCallback, NULL);
64
65 /* Return success */
66 return STATUS_SUCCESS;
67 }
68
69 /* EOF */