[OpenBIOS] [PATCH 4/5] other.fs: rework get-msecs word so it can be shared cross-platform

[Mark Cave-Ayland]

Rather than mess with [IFDEF]s, just have one implementation which falls back
to a simple incrementing dummy counter if a pointer to a real counter hasn't
been configured.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
---
 openbios-devel/forth/device/other.fs |   23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/openbios-devel/forth/device/other.fs b/openbios-devel/forth/device/other.fs
index c67c829..b390073 100644
--- a/openbios-devel/forth/device/other.fs
+++ b/openbios-devel/forth/device/other.fs
@@ -93,25 +93,22 @@ defer (poke)
  
 \ 5.3.7.3 Time
 
-[IFDEF] CONFIG_PPC
+\ Pointer to OBP tick value updated by timer interrupt
+variable obp-ticks
 
+\ Dummy implementation for platforms without a timer interrupt
 0 value dummy-msecs
 
 : get-msecs    ( -- n )
-  dummy-msecs dup 1+ to dummy-msecs
-  ;
-
-[ELSE]
-
-\ OBP tick value updated by timer interrupt
-variable obp-ticks
-
-: get-msecs    ( -- n )
-  obp-ticks @
+  \ If obp-ticks pointer is set, use it. Otherwise fall back to
+  \ dummy implementation
+  obp-ticks @ 0<> if
+    obp-ticks @
+  else
+    dummy-msecs dup 1+ to dummy-msecs
+  then
   ;
 
-[THEN]
-
 : ms    ( n -- )
   get-msecs +
   begin dup get-msecs < until
-- 
1.7.10.4