.N - Display Dump Information Summary

Display information saved by from the operating system when the stand alone dump procedure was initiated.

Syntax:

────.N ───────────────────────────────────────────────────────

Parameters:

none

Results & Notes:

.N command displays information saved saved when the kernel routine RASRST is entered at sand-alone dump initiation.

.N displays the following information:

gdtr_lim: 1FFF
gdtr_base: 7C3E5000
idtr_lim: 03FF
idtr_base: FFE00150
ldtr_reg: 0028
lo_data_sel: 0400
hi_data_sel: 0400
trace_buf_addr: 0B490400
sys_anchor_sel: 0070
arena_base: FEB1F020
max_threads: 0101
phys_page_dir: 001D6000
vm_object_ptr: FEC80020
StartInit_Data: 00000140
dcm_ote_start: FFF0A92F
CurProcPid: 000D
TaskData: 0B5C0400
FirstPacket: 158A
LastPacket: 04C0
SysSemDataTable: 53A60400
GDT_Buffers: 00A80138
PapTCBPtrs: 0B6B0400
callerSS: 00E8
callerESP: 00000FCC
savePage: 00241467

Each of the items displayed has the following significance:

gdtr_lim

The current GDTR register limit value.
gdtr_base
The current GDTR register base address.
ldtr_lim
The current LDTR selector limit.
ldtr_base
The current LDTR selector base address.
ldtr_reg
The current LDT selector.
lo_data_sel
Selector for DOSGROUP segment.
hi_data_sel
Selector for DOSHIGHDATA segment.
trace_buf_addr
Offset:selector address of ras_stda_addr, the selector for the system trace buffer.
sys_anchor_sel
Selector for the SAS.
sarena_base
Value of _parvmOne, the pointer to the first VMAR.
max_threads
Maximum Thread Slot Number.
phys_page_dir
Value of cr3 register (that is, the physical address of the page directory table).
vm_object_ptr
Value of _pobvmOne, the pointer to the first VMOB
StartInit_data
Value of _StartINITData.
dcm_ote_start
Address of DOSCALLS.DLL OTE
CurrProcPid
Current process ID.
TaskData
Offset:selector address of scheduler global data.
FirstPacket
First word of the first device driver strategy 2 request packet in packet pool.
LastPacket
First word of the last device driver strategy 2 request packet in packet pool.
SysSemDataTable
Offset:selector address of SysSemDataTable.
GDT_Buffers
GDT selector for buffer segment. The low order word of this field should be ignored.
PapTCBPtrs
Offset:selector address of papTCBPtrs. The word value at this label is an offset from the DOSGROUP selector (400) to the thread slot table.
callerSS
The SS selector on entry to RASRST, the stand alone system dump entry point within the kernel.

Note: If this dump was taken in interrupt mode the SS selector will be E8. Further more, if that last device driver to use the interrupt stack is KDB$ then it is possible the the dump process was initiated with the Ctrl-Alt-Numlock-Numlock sequence. If the dump was taken in kernel mode then the SS selector will probably be 30 and the dump will have been initiated because of a trap or call to DosForceSystemDump API.

callerESS
The ES register on entry tp RASRST, the stand alone system dump entry point within the kernel.
savePage
Page directory entry 0. This data is overwritten by the dump process.

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