DevHlp LogEntry: Difference between revisions
Created page with "{{DISPLAYTITLE:DevHlp_LogEntry}} DevHlp_LogEntry provides a device driver interface to the logging facility. ==Parameters== ;log_data_address :is the address of a buffer that contains a variable length Error Log entry. (See the section on the LogAddEntries high level API for further details.) level API for further details.) service the class of logging facility: :;0x0 ::Reserved :;0x1 ::"Old-Style" Error Logging call ("old" 16-bit (DosLogEntry-style) data packet provid..." |
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Latest revision as of 03:50, 23 May 2025
DevHlp_LogEntry provides a device driver interface to the logging facility.
Parameters
- log_data_address
- is the address of a buffer that contains a variable length Error Log entry. (See the section on the LogAddEntries high level API for further details.) level API for further details.) service the class of logging facility:
- 0x0
- Reserved
- 0x1
- "Old-Style" Error Logging call ("old" 16-bit (DosLogEntry-style) data packet provided).
- 0x2 - 0x2f
- Reserved for future use.
- 0x80 - 0x8f
- Reserved for internal use by the System Logging Service device driver.
- 0x90
- "New_Style" Error Logging call ("new" 32-bit (LogAddEntries-style) data packet provided).
- 0x91 - 0xffff
- Reserved for future use.
Returns
Return code in AX:
- Success
- non-zero
- Failure.
- Possible errors:
- Invalid log type
- Facility unavailable
- Facility suspended
Remarks
When CX is set to 80H, DS:SI is set to point to the device driver header block of the System Logging Service device driver.
Example Code
Calling sequence:
LES BX,log_data_address MOV CX,service MOV DL,DevHlp_LogEntry /* LogEntry function code 0x3b */ CALL [Device_Help]