mdw@git.distorted.org.uk Git - ssr/blob - StraySrc/Dynamite/dynamite/sh/dynArea

   1 ;
   2 ; dynArea.sh
   3 ;
   4 ; The handling of the dynamic area itself
   5 ;
   6 ; © 1994 Straylight
   7 ;
   8
   9 ;----- Overview -------------------------------------------------------------
  10 ;
  11 ; Functions provided:
  12 ;
  13 ;   da_findPage
  14 ;   da_addPages
  15 ;   da_removePages
  16 ;   da_readSize
  17 ;   da_describe
  18
  19 ; --- da_findPage ---
  20 ;
  21 ; On entry:     R2 == address of the page
  22 ;
  23 ; On exit:      R0 == page number
  24 ;
  25 ; Use:          Finds the page number of the page with the address given.
  26
  27                 IMPORT  da_findPage
  28
  29 ; --- da_addPages ---
  30 ;
  31 ; On entry:     R0 == number of pages to add
  32 ;               R12 == workspace address
  33 ;
  34 ; On exit:      Possible error returned
  35 ;
  36 ; Use:          Increases the size of the dynamic area by the number of
  37 ;               pages given in R0
  38
  39                 IMPORT  da_addPages
  40
  41 ; --- da_removePages ---
  42 ;
  43 ; On entry:     R0 == number of pages to remove
  44 ;
  45 ; On exit:      --
  46 ;
  47 ; Use:          Removes the given number of pages from the dynamite
  48 ;               area. If the number of pages to remove is greater than
  49 ;               the actual number of pages allocated, as many as possible
  50 ;               are removed
  51
  52                 IMPORT  da_removePages
  53
  54 ; --- da_readSize ---
  55 ;
  56 ; On entry:     --
  57 ;
  58 ; On exit:      R0 == size of area
  59 ;
  60 ; Use:          Returns the size of the sprite area (including the
  61 ;               dynamite area).
  62
  63                 IMPORT  da_readSize
  64
  65 ; --- da_describe ---
  66 ;
  67 ; On entry:     --
  68 ;
  69 ; On exit:      R0 == dynamic area number (3 == sprite area)
  70 ;               R1 == size of area
  71 ;               R2 == total free in area
  72 ;
  73 ; Use:          Gives back som information on the dynamite area.
  74
  75                 IMPORT  da_describe
  76
  77 ;----- That's all, folks ----------------------------------------------------
  78
  79                 END