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.nf                                                                           
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.fm 2
.he         **********     MP/M-86 Seminar Notes     **********
.fô  Alì Informatioî Hereiî ió Proprietarù Tï  Digitaì Research¬ Inc.
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.pa
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.sh
MP/M-86 Memory Management
.sh
=========================
.sp 2
Memory Parameter Block (MPB) Format:
.sp
+------+------+------+------+------+------+------+------+\ 
|   START     |     MIN     |     MAX     |   *PDADDR   |\ 
+------+------+------+------+------+------+------+------+\ 
|   *FLAGS    |                                          \ 
+------+------+                                          \ 
.sp
FLAGS:
.sp
00001H   LOAD    \ 
00002H   SHARE   \ 
00004H   CODE    \ 
00008H\\          \ 
 ...   > RESERVED\ 
08000H/          \ 
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Memory Free Parameter Block (MFPB) Format:
.sp
+------+------+------+------+\ 
|   START     |   *PDADDR   |\ 
+------+------+------+------+\ 
.sp 2
Memory Segment Descriptor (MSD) Format:
.sp
+------+------+------+------+------+------+------+------+\ 
|   *LINK     |   *START    |   *LENGTH   |   *FLAGS    |\ 
+------+------+------+------+------+------+------+------+\ 
|    *MAU     |                                          \ 
+------+------+                                          \ 
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.sh
MP/M-86 Extended Fixed Partition Model
.sh
--------------------------------------
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Memory Free List (MFL)
.sp
+-----+-----+                                                \ 
|     o     |                                                \ 
+-----|-----+                                                \ 
      V           Memory Partition Descriptor (MPD)          \ 
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+\ 
|   LINK    |   START   |   LENGTH  |   XXXXX   |   XXXXX   |\ 
+-----|-----+-----+-----+-----+-----+-----+-----+-----+-----+\ 
      V                                                      \ 
     ...                                                     \ 
+-----+-----+-----+---                                       \ 
|     0     |  MPD                                           \ 
+-----+-----+-----+---                                       \ 

.sp 2
Memory Allocation List (MAL)
.sp
+-----+-----+                                                \ 
|     o     |                                                \ 
+-----|-----+                                                \ 
      V           Memory Allocation Unit Descriptor (MAUD)   \ 
+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+\ 
|   LINK    |   START   |   LENGTH  |   PLIST   |   XXXXX   |\ 
+-----|-----+-----+-----+-----+-----+-----|-----+-----+-----+\ 
      |                                   V                  \ 
      |                             +-----+-----+-----+---   \ 
      |                             |     o     |  MPD ...   \ 
      |                             +-----|-----+-----+---   \ 
      V                                   V                  \ 
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.sh
MP/M-86 Memory Allocation Unit (MAU)
.sh
------------------------------------
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HIGH +---------------------------------+\ 
     |                                 |\ 
     |                                 |\ 
     |      Allocatable Memory         |\ 
     |                                 |\ 
     |                                 |\ 
     |                                 |\ 
     +---------------------------------+\ 
     |    Sub-Allocation Table (SAT)   |\ 
LOW  +---------------------------------+\ 
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Sub-Allocation Table (SAT) Format:
.sp
+------+------+------+------+------+\ 
|# ent.|         RESERVED          |\ 
+------+------+------+------+------+\ 
|    START    |    LENGTH   | NALL |\ 
+------+------+------+------+------+\ 
|    START    |    LENGTH   | NALL |\ 
+------+------+------+------+------+\ 
|             |             |      |\ 
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\ 
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\\ 
|             |             |      |\ 
+------+------+------+------+------+\ 
|      0      |      0      |   0  |\ 
+------+------+------+------+------+\ 
.sp 2
.sh
MP/M-86 Memory Usage at Load Time
.sh
---------------------------------
.sp 2
HIGH +---------------------------------+Ü 
     |                                 |\ 
     |          PROGRAM AREA           |\ 
     |                                 |\ 
+20H +---------------------------------+Ü 
     |             STACK               |\ 
+1AH +---------------------------------+Ü 
     |              UDA                |\ 
+0AH +---------------------------------+Ü 
     |              SAT                |\ 
+00H +---------------------------------+Ü 
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Resident System Process (RSP) Memory Models
===========================================
.sp
 8080 Model                 Small Model\ 
+----------+               +----------+\ 
| (Header) |               |   Code   |\ 
|          |               |          |\ 
| Mixed    |               +----------+\ 
|  Code &  |               | (Header) |\ 
|   Data   |               |   Data   |\ 
|          |               |          |\ 
+----------+               +----------+\ 
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RSP Header Format:
.sp
   +------+------+------+------+------+------+------+------+\ 
00 |    SYSDAT   |   SDATVAR   |  NCP |      RESERVED      |\ 
   +------+------+------+------+------+------+------+------+\ 
08 |                       RESERVED                        |\ 
   +------+------+------+------+------+------+------+------+\ 
10 |                  PROCESS DESCRIPTOR                   |\ 
   |                                                       |\ 
   +-------------------------------------------------------+\ 
40 |                                                       |\ 
   |                        UDA                            |\ 
   |                                                       |\ 
   |                                                       |\ 
   +-------------------------------------------------------+\ 
140|                                                       |\ 
   |                 PROGRAM DATA AREA                     |\ 
   |                                                       |\ 
   +-------------------------------------------------------+\ 
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.sh
Multiple Copies of RSP's
.sh
------------------------
.sp 2
Example of 3 Copies of 8080 Model, Small Model
and Shared Code Model
.sp 2
8080 Model:
.sp
+----------+        +----------+        +----------+\ 
| ncp=0    |        | ncp=1    |        | ncp=2    |\ 
|          |        |          |        |          |\ 
| Code     |        | Code     |        | Code     |\ 
|   and    |        |   and    |        |   and    |\ 
|     Data |        |     Data |        |     Data |\ 
|          |        |          |        |          |\ 
+----------+        +----------+        +----------+\ 
.sp 2
Small Model:
.sp
+----------+        +----------+        +----------+\ 
|   Code   |        |   Code   |        |   Code   |\ 
|          |        |          |        |          |\ 
+----------+        +----------+        +----------+\ 
| ncp=0    |        | ncp=1    |        | ncp=2    |\ 
|          |        |          |        |          |\ 
|   Data   |        |   Data   |        |   Data   |\ 
|          |        |          |        |          |\ 
+----------+        +----------+        +----------+\ 
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Shared Codel Model:
.sp
      +----------+                                  \ 
      |   Code   |                                  \ 
      |          |                                  \ 
      +----------+                                  \ 
.sp
+----------+        +----------+        +----------+\ 
| ncp=0    |        | ncp=1    |        | ncp=2    |\ 
|          |        |          |        |          |\ 
|   Data   |        |   Data   |        |   Data   |\ 
|          |        |          |        |          |\ 
+----------+        +----------+        +----------+\ 
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