#include <string.h>
+#include <conio.h>
#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <dirent.h>
#include <stdlib.h>
+#include <dirent.h>
#include <em.h>
-#include <conio.h>
+#ifndef __CBM__
+#include <fcntl.h>
+#include <unistd.h>
+#else
+#include <device.h>
+#endif
/* The symbols _OVERLAY?_LOAD__ and _OVERLAY?_SIZE__ were generated by the
extern void _OVERLAY1_LOAD__[], _OVERLAY1_SIZE__[];
extern void _OVERLAY2_LOAD__[], _OVERLAY2_SIZE__[];
extern void _OVERLAY3_LOAD__[], _OVERLAY3_SIZE__[];
-extern void _OVERLAY4_LOAD__[], _OVERLAY4_SIZE__[];
struct {
char *name;
} overlay[] =
{{"multdemo.1", -1, _OVERLAY1_LOAD__, (unsigned)_OVERLAY1_SIZE__},
{"multdemo.2", -1, _OVERLAY2_LOAD__, (unsigned)_OVERLAY2_SIZE__},
- {"multdemo.3", -1, _OVERLAY3_LOAD__, (unsigned)_OVERLAY3_SIZE__},
- {"multdemo.4", -1, _OVERLAY4_LOAD__, (unsigned)_OVERLAY4_SIZE__}};
-
-/* Copy overlays into extended memory up to overlay 3. Overlay 4 is known to
- * to be loaded only once for onetime initialization purposes so there's no
- * use in allocating extended memory for it.
- */
-#define MAX_EM_OVERLAY 3
+ {"multdemo.3", -1, _OVERLAY3_LOAD__, (unsigned)_OVERLAY3_SIZE__}};
#pragma code-name(pop);
-#pragma code-name (push, "OVERLAY4");
-
unsigned char loademdriver (void)
{
DIR *dir;
return 0;
}
-void copyoverlays (void)
-{
- unsigned page = 0;
- unsigned char num;
-
- for (num = 0; num < MAX_EM_OVERLAY; ++num) {
- int file;
- int size;
-
- if ((overlay[num].size + EM_PAGE_SIZE - 1) / EM_PAGE_SIZE >
- em_pagecount () - page) {
- printf ("Dbg: Not enough memory for overlay %u\n", num + 1);
- continue;
- }
-
- printf ("Dbg: Reading overlay file %s\n", overlay[num].name);
- file = open (overlay[num].name, O_RDONLY);
- if (file == -1) {
- log ("Opening overlay file failed");
- continue;
- }
-
- overlay[num].page = page;
- size = overlay[num].size;
- while (size) {
- void *buf;
-
- /* In general one could as well use em_copyto() to copy a fully
- * loaded overlay into extended memory in one step. However the
- * "streaming" of an overlay from disk to extended memory shown
- * here has two advantages:
- * - It can be done from another overlay (like done here).
- * - It avoids unnecessary double buffering with emdrivers that
- * provide a hardware memory window.
- */
- buf = em_use (page++);
- size -= read (file, buf, EM_PAGE_SIZE);
- em_commit ();
- }
-
- printf ("Dbg: Stored overlay %u in pages %u-%u\n",
- num + 1, overlay[num].page, page - 1);
-
- close (file);
- }
-}
-
-#pragma code-name(pop);
-
unsigned char loadoverlay (unsigned char num)
{
if (overlay[num - 1].page < 0) {
+#ifndef __CBM__
+
int file;
printf ("Dbg: Loading overlay %u from file\n", num);
read (file, overlay[num - 1].addr,
overlay[num - 1].size);
close (file);
+
+#else
+
+ if (cbm_load (overlay[num - 1].name, getcurrentdevice (), NULL) == 0) {
+ log ("Loading overlay file failed");
+ return 0;
+ }
+
+#endif
return 1;
} else {
struct em_copy copyinfo;
}
}
-void main (void)
+
+void copyoverlays (void)
{
- if (loadoverlay (4)) {
- log ("Loading extended memory driver");
- if (loademdriver ()) {
- log ("Copying overlays into ext. memory");
- copyoverlays ();
- } else {
- log ("No extended memory driver found");
+ unsigned page = 0;
+ unsigned char num;
+
+ for (num = 0; num < sizeof (overlay) / sizeof (overlay[0]); ++num) {
+ struct em_copy copyinfo;
+ unsigned size = (overlay[num].size + EM_PAGE_SIZE - 1) / EM_PAGE_SIZE;
+
+ if (size > em_pagecount () - page) {
+ printf ("Dbg: Not enough memory for overlay %u\n", num + 1);
+ continue;
}
+
+ if (loadoverlay (num + 1) == 0)
+ continue;
+
+ copyinfo.offs = 0;
+ copyinfo.page = page;
+ copyinfo.buf = overlay[num].addr;
+ copyinfo.count = overlay[num].size;
+ em_copyto (©info);
+
+ overlay[num].page = page;
+ page += size;
+
+ printf ("Dbg: Stored overlay %u in pages %u-%u\n",
+ num + 1, overlay[num].page, page - 1);
+ }
+}
+
+
+void main (void)
+{
+ log ("Loading extended memory driver");
+ if (loademdriver ()) {
+ log ("Copying overlays into ext. memory");
+ copyoverlays ();
+ } else {
+ log ("No extended memory driver found");
}
log ("Press any key...");