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Use cbm_load() to load overlays on CBMs.

This commit is contained in:
Oliver Schmidt 2013-05-29 01:12:24 +02:00
parent 17776739e2
commit 7572834ebf
5 changed files with 161 additions and 73 deletions
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19
cfg/c128-overlay.cfg
View File

@ -1,6 +1,7 @@
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__OVERLAYADDR__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
}
@ -9,14 +10,23 @@ MEMORY {
LOADADDR: file = %O, start = $1BFF, size = $0002;
HEADER: file = %O, start = $1C01, size = $000C;
RAM: file = %O, define = yes, start = $1C0D, size = $A3F3 - __OVERLAYSIZE__ - __STACKSIZE__;
OVL1ADDR: file = "%O.1", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL1: file = "%O.1", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL2ADDR: file = "%O.2", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL2: file = "%O.2", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL3ADDR: file = "%O.3", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL3: file = "%O.3", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL4ADDR: file = "%O.4", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL4: file = "%O.4", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL5ADDR: file = "%O.5", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL5: file = "%O.5", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL6ADDR: file = "%O.6", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL6: file = "%O.6", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL7ADDR: file = "%O.7", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL7: file = "%O.7", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL8ADDR: file = "%O.8", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL8: file = "%O.8", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL9ADDR: file = "%O.9", start = $BFFE - __OVERLAYSIZE__, size = $0002;
OVL9: file = "%O.9", start = $C000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
}
SEGMENTS {
@ -31,14 +41,23 @@ SEGMENTS {
ZPSAVE: load = RAM, type = bss;
BSS: load = RAM, type = bss, define = yes;
ZEROPAGE: load = ZP, type = zp;
OVL1ADDR: load = OVL1ADDR, type = ro;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVL2ADDR: load = OVL2ADDR, type = ro;
OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
OVL3ADDR: load = OVL3ADDR, type = ro;
OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
OVL4ADDR: load = OVL4ADDR, type = ro;
OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
OVL5ADDR: load = OVL5ADDR, type = ro;
OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
OVL6ADDR: load = OVL6ADDR, type = ro;
OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
OVL7ADDR: load = OVL7ADDR, type = ro;
OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
OVL8ADDR: load = OVL8ADDR, type = ro;
OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
OVL9ADDR: load = OVL9ADDR, type = ro;
OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
}
FEATURES {

19
cfg/c64-overlay.cfg
View File

@ -1,6 +1,7 @@
SYMBOLS {
__LOADADDR__: type = import;
__EXEHDR__: type = import;
__OVERLAYADDR__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__OVERLAYSIZE__: type = weak, value = $1000; # 4k overlay
}
@ -9,14 +10,23 @@ MEMORY {
LOADADDR: file = %O, start = $07FF, size = $0002;
HEADER: file = %O, start = $0801, size = $000C;
RAM: file = %O, define = yes, start = $080D, size = $C7F3 - __OVERLAYSIZE__ - __STACKSIZE__;
OVL1ADDR: file = "%O.1", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL1: file = "%O.1", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL2ADDR: file = "%O.2", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL2: file = "%O.2", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL3ADDR: file = "%O.3", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL3: file = "%O.3", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL4ADDR: file = "%O.4", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL4: file = "%O.4", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL5ADDR: file = "%O.5", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL5: file = "%O.5", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL6ADDR: file = "%O.6", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL6: file = "%O.6", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL7ADDR: file = "%O.7", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL7: file = "%O.7", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL8ADDR: file = "%O.8", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL8: file = "%O.8", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
OVL9ADDR: file = "%O.9", start = $CFFE - __OVERLAYSIZE__, size = $0002;
OVL9: file = "%O.9", start = $D000 - __OVERLAYSIZE__, size = __OVERLAYSIZE__;
}
SEGMENTS {
@ -31,14 +41,23 @@ SEGMENTS {
ZPSAVE: load = RAM, type = bss;
BSS: load = RAM, type = bss, define = yes;
ZEROPAGE: load = ZP, type = zp;
OVL1ADDR: load = OVL1ADDR, type = ro;
OVERLAY1: load = OVL1, type = ro, define = yes, optional = yes;
OVL2ADDR: load = OVL2ADDR, type = ro;
OVERLAY2: load = OVL2, type = ro, define = yes, optional = yes;
OVL3ADDR: load = OVL3ADDR, type = ro;
OVERLAY3: load = OVL3, type = ro, define = yes, optional = yes;
OVL4ADDR: load = OVL4ADDR, type = ro;
OVERLAY4: load = OVL4, type = ro, define = yes, optional = yes;
OVL5ADDR: load = OVL5ADDR, type = ro;
OVERLAY5: load = OVL5, type = ro, define = yes, optional = yes;
OVL6ADDR: load = OVL6ADDR, type = ro;
OVERLAY6: load = OVL6, type = ro, define = yes, optional = yes;
OVL7ADDR: load = OVL7ADDR, type = ro;
OVERLAY7: load = OVL7, type = ro, define = yes, optional = yes;
OVL8ADDR: load = OVL8ADDR, type = ro;
OVERLAY8: load = OVL8, type = ro, define = yes, optional = yes;
OVL9ADDR: load = OVL9ADDR, type = ro;
OVERLAY9: load = OVL9, type = ro, define = yes, optional = yes;
}
FEATURES {

47
libsrc/cbm/overlayaddr.s Normal file
View File

@ -0,0 +1,47 @@
;
; Oliver Schmidt, 2013-05-28
;
; This module supplies the load addresses that are expected by Commodore
; machines in the first two bytes of overlay disk files.
;
; The following symbol is used by linker config to force the module
; to get included into the output file
.export __OVERLAYADDR__: absolute = 1
.segment "OVL1ADDR"
.addr *+2
.segment "OVL2ADDR"
.addr *+2
.segment "OVL3ADDR"
.addr *+2
.segment "OVL4ADDR"
.addr *+2
.segment "OVL5ADDR"
.addr *+2
.segment "OVL6ADDR"
.addr *+2
.segment "OVL7ADDR"
.addr *+2
.segment "OVL8ADDR"
.addr *+2
.segment "OVL9ADDR"
.addr *+2

131
samples/multidemo.c
View File

@ -8,13 +8,17 @@
#include <string.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <em.h>
#ifndef __CBM__
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <em.h>
#include <conio.h>
#else
#include <device.h>
#endif
/* The symbols _OVERLAY?_LOAD__ and _OVERLAY?_SIZE__ were generated by the
@ -24,7 +28,6 @@
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;
@ -34,14 +37,7 @@ struct {
} 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__}};
@ -94,8 +90,6 @@ void foobar (void)
#pragma code-name(pop);
#pragma code-name (push, "OVERLAY4");
unsigned char loademdriver (void)
{
DIR *dir;
@ -148,59 +142,12 @@ unsigned char loademdriver (void)
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);
@ -212,6 +159,15 @@ unsigned char loadoverlay (unsigned char 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;
@ -226,16 +182,47 @@ unsigned char loadoverlay (unsigned char num)
}
}
void copyoverlays (void)
{
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 (&copyinfo);
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)
{
if (loadoverlay (4)) {
log ("Loading extended memory driver");
if (loademdriver ()) {
log ("Copying overlays into ext. memory");
copyoverlays ();
} else {
log ("No extended memory driver found");
}
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...");

18
samples/overlaydemo.c
View File

@ -9,8 +9,12 @@
#include <stdio.h>
#include <conio.h>
#ifndef __CBM__
#include <fcntl.h>
#include <unistd.h>
#else
#include <device.h>
#endif
extern void _OVERLAY1_LOAD__[], _OVERLAY1_SIZE__[];
@ -69,14 +73,26 @@ void foobar (void)
unsigned char loadfile (char *name, void *addr, void *size)
{
#ifndef __CBM__
int file = open (name, O_RDONLY);
if (file == -1) {
log ("Opening overlay file failed");
return 0;
}
read (file, addr, (unsigned) size);
close (file);
#else
/* Avoid compiler warnings about unused parameters. */
(void) addr; (void) size;
if (cbm_load (name, getcurrentdevice (), NULL) == 0) {
log ("Loading overlay file failed");
return 0;
}
#endif
return 1;
}