Free Page Frame Structures

ffdf509c Free:               BLink=0000f Flg=4 FLink=001da Blk=00001 Frame=0000d
ffdf50a8 Free:               BLink=001f2 Flg=4 FLink=0003f Blk=00001 Frame=0000e
ffdf50b4 Free:               BLink=001f1 Flg=4 FLink=0000d Blk=00001 Frame=0000f
ffdf50c0 Free:               BLink=001fe Flg=4 FLink=001f1 Blk=00000 Frame=00010

Notes

• Free Page Frame Structures are chained in a double linked-list. The head of this list may be located as follows:

  • Locate list structure whose address is given by _pgFreeList

  • The first double-word of the list structure points to the pseudo-page frame structure that heads the free list.

  • The second double-word contains the pseudo-frame number of the pseudo-PF. N.B. This marks the end of the linked list only.

  • The backward pointer to the first true free PF is given by the 5 low order digits of the second double-word of the pseudo-PF. This value may be used with the .MP command to format the first free PF provided it is not equal to the pseudo-frame number, which would imply no free PFs on the free list.

  • Subsequent free PFs are found by following the BLink until the pseudo-frame is encountered.
  
  The Blk field has a residual field an is of no direct relevance to free Page Frame Structures.

  For a description of the fields formatted by .MP select .MP Output Field Descriptions

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