/*
- * Extended memory overlay demo program.
- *
- * Shows how to combine multiple cc65 features
- * incl. overlays and extended memory drivers.
- *
- * 2012-17-07, Oliver Schmidt (ol.sc@web.de)
- *
- */
+** Extended memory overlay demo program.
+**
+** Shows how to combine multiple cc65 features
+** incl. overlays and extended memory drivers.
+**
+** 2012-17-07, Oliver Schmidt (ol.sc@web.de)
+**
+*/
/* The symbols _OVERLAY?_LOAD__ and _OVERLAY?_SIZE__ were generated by the
- * linker. They contain the overlay area address and size specific to a
- * certain program.
- */
+** linker. They contain the overlay area address and size specific to a
+** certain program.
+*/
extern void _OVERLAY1_LOAD__[], _OVERLAY1_SIZE__[];
extern void _OVERLAY2_LOAD__[], _OVERLAY2_SIZE__[];
extern void _OVERLAY3_LOAD__[], _OVERLAY3_SIZE__[];
/* Functions resident in an overlay can call back functions resident in the
- * main program at any time without any precautions. The function log() is
- * an example for such a function resident in the main program.
- */
+** main program at any time without any precautions. The function log() is
+** an example for such a function resident in the main program.
+*/
void log (char *msg)
{
/* Functions resident in an overlay can access all program variables and
- * constants at any time without any precautions because those are never
- * placed in overlays. The string constant below is an example for such
- * a constant resident in the main program.
- */
+ ** constants at any time without any precautions because those are never
+ ** placed in overlays. The string constant below is an example for such
+ ** a constant resident in the main program.
+ */
printf ("Log: %s\n", msg);
}
/* In a real-world overlay program one would probably not use a #pragma but
- * rather place all the code of certain source files into the overlay by
- * compiling them with --code-name OVERLAY1.
- */
+** rather place all the code of certain source files into the overlay by
+** compiling them with --code-name OVERLAY1.
+*/
#pragma code-name (push, "OVERLAY1");
void foo (void)
log ("Calling overlay 1 from main");
/* The linker makes sure that the call to foo() ends up at the right mem
- * addr. However it's up to user to make sure that the - right - overlay
- * is actually loaded before making the the call.
- */
+ ** addr. However it's up to user to make sure that the - right - overlay
+ ** is actually loaded before making the the call.
+ */
foo ();
}
/* Replacing one overlay with another one can only happen from the main
- * program. This implies that an overlay can never load another overlay.
- */
+ ** program. This implies that an overlay can never load another overlay.
+ */
if (loadoverlay (2)) {
log ("Calling overlay 2 from main");
bar ();