.A - Format the System Anchor Segment (SAS)

Format the System Anchor Segment (SAS).

Syntax:

────.A ───────────────────────────────────────────────────────

Parameters:

none

Results & Notes:

The SAS is located from either GTD selector 70 or 78.

.A displays the following information:

--- SAS Base Section ---
                      SAS signature: SAS
           offset to tables section: 0016
      FLAT selector for kernel data: 0168
    offset to configuration section: 001E
    offset to device driver section: 0020
   offset to Virtual Memory section: 002C
          offset to Tasking section: 005C
              offset to RAS section: 006E
      offset to File System section: 0074
          offset to infoseg section: 0080
--- SAS Protected Modes Tables Section ---
                   selector for GDT: 0008
                   selector for LDT: 0000
                   selector for IDT: 0018
               selector for GDTPOOL: 0100
--- SAS Device Driver Section ---
    offset for the first bimodal dd: 0CB9
  offset for the first real mode dd: 0000
      sel for Drive Parameter Block: 04C8
       sel for ABIOS prot. mode CDA: 0000
        seg for ABIOS real mode CDA: 0000
                   selector for FSC: 00C8
--- SAS Task Section ---
          selector for current PTDA: 0030
  FLAT offset for process tree head: FFF10910
 FLAT address for TCB address array: FFF06BB6
      offset for current TCB number: FFDFFB5E
             offset for ThreadCount: FFDFFB62
--- SAS File System Section ---
                handle to MFT PTree: FE72CFBC
     selector for System File Table: 00C0
     sel. for Volume Parameter Bloc: 0788
   sel. for Current Directory Struc: 07B8
        selector for buffer segment: 00A8
--- SAS Information Segment Section ---
       selector for global info seg: 0428
   address of curtask local infoseg: 03C80000
      address of DOS task's infoseg: FFFFFFFF
         selector for Codepage Data: 07CB
--- SAS RAS Section ---
selector for System Trace Data Area: 04B0
 segment for System Trace Data Area: 04B0
        offset for trace event mask: 0B28
--- SAS Configuration Section ---
    offset for Device Config. Table: 0D50
--- SAS Virtual Memory Mgt. Section ---
       Flat offset of arena records: FFF13304
      Flat offset of object records: FFF1331C
     Flat offset of context records: FFF1330C
  Flat offset of kernel mte records: FFF0A891
     Flat offset of linked mte list: FFF07934
    Flat offset of page frame table: FFF11A70
    Flat offset of page range table: FFF111EC
    Flat offset of swap frame array: FFF03BAC
           Flat offset of Idle Head: FFF10090
           Flat offset of Free Head: FFF10080
          Flat offset of Heap Array: FFF11B78
     Flat offset of all mte records: FFF12E04

Each of the items displayed has the following significance:

• SAS Base Section ---
  Marks the beginning of the SAS header section.
  SAS signature
  SAS signature from SAS_signature (SAS+0x0). Always set to character value "SAS ".
  offset to tables section
  Offset from SAS selector to the protected mode tables section.

  Taken from SAS_tables_data (SAS+0x4).

  FLAT selector for kernel data
  Selector for 4G Read/Write addressability.

  Taken from SAS_flat_sel (SAS+0x6).

  offset to configuration section
  Offset from SAS selector to the configuration tables section.

  Taken from SAS_config_data (SAS+0x8).

  offset to device driver section
  Offset from SAS selector to the device driver section.

  Taken from SAS_dd_data (SAS+0xa).

  offset to Virtual Memory section
  Offset from SAS selector to the Virtual Memory section.

  Taken from SAS_vm_data (SAS+0xc).

  offset to Tasking section
  Offset from SAS selector to the Tasking section.

  Taken from SAS_task_data (SAS+0xe).

  offset to RAS section
  Offset from SAS selector to the RAS data section.

  Taken from SAS_RAS_data (SAS+0x10).

  offset to File System section
  Offset from SAS selector to the File System section.

  Taken from SAS_file_data (SAS+0x12).

  offset to infoseg section
  Offset from SAS selector to the Infoseg section.

  Taken from SAS_info_data (SAS+0x1e).

  --- SAS Protected Modes Tables Section --
  Marks the beginning of the protected mode tables section
  selector for GDT
  GDT selector that maps the GDT.

  Taken from SAS_tbl_GDT (SAS_tables_section+0x0).

  selector for LDT
  No longer used.

  Taken from SAS_tbl_LDT (SAS_tables_section+0x2).

  selector for IDT
  GDT selector that maps the IDT

  Taken from SAS_tbl_IDT (SAS_tables_section+0x4).

  selector for GDTPOOL
  First GTD selector in selector pool. I.e first non-predefined GDT selector.

  Taken from SAS_tbl_GDTPOOL (SAS_tables_section+0x6).

  --- SAS Device Driver Section --
  Marks the beginning of the Device Driver Section
  offset for the first bimodal dd
  Offset from SAS selector to the first device driver header in the device driver chain.

  See .D command for formatting device driver headers.

  Taken from SAS_dd_bimodal_chain (SAS_dd_section+0x0).

  offset for the first real mode dd
  No longer used.

  Taken from SAS_dd_real_chain (SAS_dd_section+0x2).

  sel for Drive Parameter Block
  Selector that points to the head of the DPB chain.

  See .D command for formatting DPBs.

  Taken from SAS_dd_DPB_segment (SAS_dd_section+0x4).

  sel for ABIOS prot. mode CDA
  Selector for ABIOS protect mode CDA.

  See .C command for displaying CDA information.

  Taken from SAS_dd_CDA_anchor_p (SAS_dd_section+0x6).

  seg for ABIOS real mode CDA
  Segment for ABIOS real mode CDA. See .C command for displaying CDA information.

  Taken from SAS_dd_CDA_anchor_r (SAS_dd_section+0x8).

  selector for FSC
  Selector for the FSC segment.

  Taken from SAS_dd_FSC (SAS_dd_section+0x2).

  --- SAS Task Section --
  Marks the beginning of the tasking section
  selector for current PTDA
  Selector for the current PTDA and ring 0 stack.

  Taken from SAS_task_PTDA (SAS_task_section+0x0).

  FLAT offset for process tree head
  Linear address of _pPTDAFirst, which contains the linear address of the PTDA that heads the PTDA tree.

  Taken from SAS_task_ptdaptrs (SAS_task_section+0x2).

  FLAT address for TCB address array
  Linear address of _papTCBSlots, which contains the linear address of the TCB array.

  Taken from SAS_task_threadptrs (SAS_task_section+0x6).

  offset for current TCB number
  Linear address of _TaskNumber, which contains the current thread slot number.

  Taken from SAS_task_tasknumber (SAS_task_section+0xa).

  offset for ThreadCount
  Linear address of _ThreadCount, which contains the highest thread slot number in use - 1.

  Taken from SAS_task_threadcount (SAS_task_section+0xe).

  --- SAS File System Section --
  Marks the beginning of the File System Section
  handle to MFT PTree
  Linear address of the head of the Ptree for the .

  See .D command for formatting MPTs.

  Taken from SAS_file_MFT (SAS_file_section+0x0).

  selector for System File Table
  Selector for the segment containing a table of selectors that point to tables of SFTs. Each SFT table contains an 8 byte header followed by contiguous SFT entries.

  See .D command for formatting SFTs.

  Taken from SAS_file_SFT (SAS_file_section+0x4).

  sel. for Volume Parameter Bloc
  This is the selector for the work buffer used by volume mount processing.

  Taken from SAS_file_VPB (SAS_file_section+0x6).

  Note:

  The selector for the VPB segment is not given by this field. It may be located from the selector named by global variable GDT_VPB See .D command for formatting VPBs.

  sel. for Current Directory Struc
  Selector for the RMP segment containing CDS structures.

  See .D command for formatting CDSs.

  Taken from SAS_file_CDS (SAS_file_section+0x8).

  selector for buffer segment
  Selector for the file system buffer segment.

  Taken from SAS_file_buffers (SAS_file_section+0xa).

  --- SAS Information Segment Section --
  Marks the beginning of the Information Section.
  selector for global info seg
  Selector for the Global Information Segment (GISEG).

  Taken from SAS_info_global (SAS_info_section+0x0).

  address of curtask local infoseg
  16:16 far pointer for the current Local Information Segment (LISEG).

  Taken from SAS_info_global (SAS_info_section+0x2).

  address of DOS task's infoseg
  Real mode local information segment pointer (unused).

  Taken from SAS_info_localRM (SAS_info_section+0x6).

  selector for Codepage Data
  Selector for the segment containing the Code Page Data Information Block (CDIB).

  Taken from SAS_info_CDIB (SAS_info_section+0xa).

  --- SAS RAS Section --
  Marks the beginning of the RAS section
  selector for System Trace Data Area
  Selector for the STDA trace buffer.

  Taken from SAS_RAS_STDA_p

  See .T command for formatting the system trace buffer. (SAS_RAS_section+0x0).

  segment for System Trace Data Area
  Selector for the STDA trace buffer.

  Taken from SAS_RAS_STDA_r (SAS_RAS_section+0x2).

  The same value is stored in both SAS_RAS_STDA_p and SAS_RAS_STDA_r.

  offset for trace event mask
  Offset from the SAS to the trace major event codes table (ras_mec_table).

  Taken from SAS_RAS_event_mask (SAS_RAS_section+0x4).

  --- SAS Configuration Section --
  Marks the beginning of the Configuration section
  offset for Device Config. Table
  Offset from the SAS to the device configuration table.

  Taken from SAS_config_table (SAS_config_section+0x0).

  --- SAS Virtual Memory Mgt. Section --
  Marks the beginning of the Virtual Memory Management section
  Flat offset of arena records
  The linear address of _parvmOne, the linear address of the first VM arena record (VMAR).

  See .MA command for related information.

  Taken from SAS_vm_arena (SAS_vm_section+0x0).

  Flat offset of object records
  The linear address of _pobvmOne, the linear address of the first VM object record (VMOB).

  See .MO command for related information.

  Taken from SAS_vm_object (SAS_vm_section+0x4).

  Flat offset of context records
  The linear address of _pcovmOne, the linear address of the first VM context record (VMCO).

  See .MC command for related information.

  Taken from SAS_vm_context (SAS_vm_section+0x8).

  Flat offset of kernel mte records
  The linear address of _DosModMTE, the kernel (DOSCALLS.DLL) MTE.

  See .LM command for related information.

  Taken from SAS_vm_krnl_mte (SAS_vm_section+0xc ) .

  Flatoffsetoflinkedmtelist
  Thelinearaddressof_ global _ h ,thelinearaddressoftheheadoftheMTEchainoflinklibrarymodules .

  See .LM command for related information.

  Taken from SAS_vm_glbl_mte (SAS_vm_section+0x10).

  Flat offset of page frame table
  The linear address of _pft, the linear address of the first (frame 0) page frame structure (PF).

  See .MP command for related information.

  Taken from SAS_vm_pft (SAS_vm_section+0x14).

  Flat offset of page range table
  The linear address of _pgPageablePAI, the pageable PAI. The first double word of the PAI points to the page range table.

  Taken from SAS_vm_prt (SAS_vm_section+0x18).

  Flat offset of swap frame array
  The linear address of _smbmDF, the linear address of swap frame allocation bit map followed by _smFileSize, the swap file size word length value in pages.

  Taken from SAS_vm_swap (SAS_vm_section+0x1c).

  Flat offset of Idle Head
  The linear address of _pgIdleList, which points to the pseudo-PF at the head of the idle PF list.

  See Idle Page Frame Structures for more information locating Idle Page Frame Structures.

  See .MP command for related information.

  Taken from SAS_vm_idle_head (SAS_vm_section+0x20).

  Flat offset of Free Head
  The linear address of _pgFreeList, which points to the pseudo-PF at the head of the free PF list.

  See Free Page Frame Structures for more information locating Free Page Frame Structures.

  See .MP command for related information.

  Taken from SAS_vm_free_head (SAS_vm_section+0x24).

  Flat offset of Heap Array
  The linear address of _apkh, the array of VMKH kernel heap header structures. Note: the first entry is unused.

  Taken from SAS_vm_heap_info (SAS_vm_section+0x28).

  Flat offset of all mte records
  The linear address of _mte_h, which is the linear address of the head of the MTE chain.

  See .LM command for related information.

  Taken from SAS_vm_all_mte (SAS_vm_section+0x2c).

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