ProgAddedum - Device Helper (DevHlp) Services and Function Codes
DevHlp services include :
| Service | Code | Description |
|---|---|---|
| DevHlp_CloseFile | 80h | Close file (system initialization time only) |
| DevHelp_FreeCtxHook | 64h | Free context hook |
| DevHlp_FileOpen | 7Fh | Open file (at initialization) |
| DevHlp_GetDosVar | 24h | Return address of kernel variable |
| DevHlp_KillProc | 7Dh | Kill process unconditionally |
| DevHlp_OpenFile | 7Fh | Open file (system initialization time only) |
| DevHlp_PerfSysTrace | 45h | Write Software Trace information to STRACE buffer |
| DevHlp_QSysState | 7Eh | Get system status information |
| DevHlp_ReadFile | 81h | Read (system initialization time only) |
| DevHlp_ReadFileAt | 82h | Seek and read (system initialization time only) |
| DevHlp_RegisterKDD | 83h | Register driver with kernel debugger |
| DevHlp_SysTrace | 28h | Add information to System Trace buffer |
- System event notification
| Event | Index | Description |
|---|---|---|
| event_POWER | 9 | Power off event |