obp/obp/cpu/sparc/memtest.fth

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\ Hypervisor Software File: memtest.fth
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id: @(#)memtest.fth 1.3 94/05/30
purpose: Fast memory test
copyright: Copyright 1992 Sun Microsystems, Inc.  All Rights Reserved

headerless
code test-memory  ( start-addr count -- obs-data exp-data fail-adr true | false )

   tos   scr  move      \ count in scr
   sp 0  sc1  nget      \ start in sc1

   \ Backwards fill with 0
   scr  sc2  move
   0 F:  bra    \ jump to the until  branch
   nop
   begin
      %g0  sc1 sc2  st
   0 L:
      sc2 4  sc2  subcc
   0< until
      nop               \ Delay slot

   \ Forward test for 0 and fill with -1
   -1  sc4  set
   %g0  sc2  move
   0 F:  bra    \ jump to the until  branch
   nop
   begin
      sc1 sc2  sc3  ld
      sc3 %g0  %g0  subcc
      0<> if nop
         -1  tos    move     \ fail
         sp 2 /n*   sp  sub  \ Make room on the stack
         sc1 sc2    sc1 add  \ failed address
         sc1  sp 0 /n*  nput \ failed adr
         %g0  sp 1 /n*  nput \ expected data
         sc3  sp 2 /n*  nput \ observed data
         next                \ exit
      then
      sc4  sc1 sc2 st
      sc2 4 sc2 add
   0 L:
      scr sc2  %g0  subcc
   0<= until
      nop               \ Delay slot

   \ Backwards check for -1 and fill with 0
   -1  sc4  set
   scr  sc2  move
   0 F:  bra    \ jump to the until  branch
   nop
   begin
      sc1 sc2  sc3  ld
      sc3 sc4  %g0  subcc
      0<> if nop
         -1  tos    move     \ fail
         sc1 sc2  sc1 add    \ failed address
         sc1  sp 0 /n*  nput
         sc4  sp 1 /n*  nput \ expected data
         sc3  sp 2 /n*  nput \ observed data
         next                \ exit
      then
      %g0  sc1 sc2 st
   0 L:
      sc2 4  sc2  subcc
   0< until
      nop               \ Delay slot

      0 tos  move               \ put false (=pass) on stack
      sp  /n   sp   add         \   "
c;
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