git.sur5r.net Git - cc65/blob - libsrc/common/_heap.s

   1 ;
   2 ; Ullrich von Bassewitz, 03.06.1998
   3 ;
   4 ; Heap variables and initialization.
   5 ;
   6
   7         .constructor    initheap, 24
   8         .import         __BSS_RUN__, __BSS_SIZE__, __STACKSIZE__
   9         .importzp       sp
  10
  11         .include        "_heap.inc"
  12
  13
  14 .data
  15
  16 __heaporg:
  17         .word   __BSS_RUN__+__BSS_SIZE__        ; Linker calculates this symbol
  18 __heapptr:
  19         .word   __BSS_RUN__+__BSS_SIZE__        ; Dito
  20 __heapend:
  21         .word   __BSS_RUN__+__BSS_SIZE__
  22 __heapfirst:
  23         .word   0
  24 __heaplast:
  25         .word   0
  26
  27
  28 ; Initialization. Will be called from startup!
  29
  30 .segment        "ONCE"
  31
  32 initheap:
  33         sec
  34         lda     sp
  35         sbc     #<__STACKSIZE__
  36         sta     __heapend
  37         lda     sp+1
  38         sbc     #>__STACKSIZE__
  39         sta     __heapend+1
  40         rts
  41
  42