Difference between revisions of "GeneveOS Memory Management Functions"

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|-
|-
|
|
! Input
! Input !! Output
! Output
|-
|-
| R0
| R0
| Opcode (0000)
| Opcode (0000) || Error code (always 0)
| Error code (always 0)
|-
|-
| R1
| R1
|  
| || Number of free pages
| Number of free pages
|-
|-
| R2  
| R2  
|
| || Number of fast free pages
| Number of fast free pages
|-
|-
|}
|}
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=== Claim pages into local map from free pages ===
=== Claim pages into local map from free pages ===


opcode #1, claim pages into local map from free pages
'''Opcode: 1'''
      pass:            r1=number of pages
 
                        r2=local page address
{| class="plaincr"
                        r3=speed flag <>0 means FAST
|-
      return:          r0=error code
|
                        r1=number of pages actually fetched
! Input !! Output
                            to complete map as required
|-
                        r2=number of fast pages fetched
| R0
| Opcode (0001) || Error code
|-
| R1
| Number of pages || Number of pages actually fetched to complete map as required
|-
| R2
| Local page address || Number of fast pages fetched
|-
| R3
| Speed flag (0 is slow, else fast) ||
|-
|}


=== Return pages into free pool from local map ===
=== Return pages into free pool from local map ===


opcode #2, return pages into free pool from local map
'''Opcode: 2'''
      pass:            r1=number of pages
 
                        r2=local page address
{| class="plaincr"
      return:          r0=error code
|-
|
! Input !! Output
|-
| R0
| Opcode (0002) || Error code
|-
| R1
| Number of pages ||
|-
| R2
| Local page address ||
|-
|}


=== Map local page at excution page ===
=== Map local page at excution page ===


opcode #3, map local page at excution page
'''Opcode: 3'''
      pass:            r1=local page number
 
                        r2=execution page number
{| class="plaincr"
      return:          r0=error code
|-
|
! Input !! Output
|-
| R0
| Opcode (0003) || Error code
|-
| R1
| Local page number ||
|-
| R2
| Execution page number ||
|-
|}


=== Get address map ===
=== Get address map ===


opcode #4, get address map
'''Opcode: 4'''
      pass:            r1=execution address
 
                        r2=size of area for map
{| class="plaincr"
      return:          r0=error code
|-
                        r1=count of pages reported
|
! Input !! Output
|-
| R0
| Opcode (0004) || Error code
|-
| R1
| Execution address || Count of pages reported
|-
| R2
| Size of area for map ||
|-
|}
 


=== Declare shared pages ===
=== Declare shared pages ===

Revision as of 14:16, 11 November 2011

Memory management in MDOS is available via XOP 7.

General purpose XOPs

Return number of free pages in system

Opcode: 0

Input Output
R0 Opcode (0000) Error code (always 0)
R1 Number of free pages
R2 Number of fast free pages

Claim pages into local map from free pages

Opcode: 1

Input Output
R0 Opcode (0001) Error code
R1 Number of pages Number of pages actually fetched to complete map as required
R2 Local page address Number of fast pages fetched
R3 Speed flag (0 is slow, else fast)

Return pages into free pool from local map

Opcode: 2

Input Output
R0 Opcode (0002) Error code
R1 Number of pages
R2 Local page address

Map local page at excution page

Opcode: 3

Input Output
R0 Opcode (0003) Error code
R1 Local page number
R2 Execution page number

Get address map

Opcode: 4

Input Output
R0 Opcode (0004) Error code
R1 Execution address Count of pages reported
R2 Size of area for map


Declare shared pages

opcode #5, declare shared pages
     pass:             r1=number of pages to declare as shared
                       r2=local page address
                       r3=type to be assigned to shared pages
     return:           r0=error code

Release shared pages (type)

opcode #6, release shared pages (type)
     pass:             r1=type
     return:           r0=error code
     also have to check their current execution map

Get shared pages

opcode #7, get shared pages
     pass:             r1=type
                       r2=local page number for start of shared area
     return:           r0=error code

Return size of shared page group

opcode #8, return size of shared page group
     pass:             r1=type
     return:           r0=error code
                       r1=number of pages in shared group

Privileged XOPs (only available for operating system)

Release task

opcode #9 : release task    in: nil        (task header at >8000)
                            out: nil

Page get

opcode #A :  page get  in:  r0=>000A
                            r1=page number to get,
                                if r1h <> 0, get first available
                            r2=speed flag   <>0 means fast
                      out:  r0=error code
                            r1=pointer to node
                            r2=page number from node

Add page to free pages in system

opcode #B : add page to free pages in system
              in:      r0=>000B
                       r1=page number
             out:      r0= error if no free nodes available

Add a node to the list of free nodes

opcode #C : add a node to the list of free nodes
              in:      r0=>000C
                       r1=pointer to node
             out:   no errors

Link a node to the specified node

opcode #D : link a node to the specified node
              in:      r0=>000D
                       r1=pointer to node
                       r2=pointer to node to link to
             out:   no errors

Get address map (system)

opcode #E, get address map  (system)
     return:           R0= count of valid pages
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