Macintosh-HW/MacIIROMDiskDriver
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Don't call copy24 in RAM. Call copy24 directly using valid 24-bit address.

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This commit is contained in:
Zane Kaminski 2020-06-24 13:15:28 -04:00
parent 091b33c2d7
commit f15ccd316c
1 changed files with 10 additions and 22 deletions
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32
rdisk.c
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@ -25,9 +25,11 @@ void GWROMDisk() {
#define MemTop ((Ptr*)0x108)
#define MMU32bit ((char*)0x0CB2)
#define Copy24Size (64)
typedef void (*ROMDiskCopy_t)(char *, char *, unsigned long);
void Copy24(char *source, char *dest, unsigned long count) {
// Switch to 24-bit mode and copy. Call this with
// PC==0x408XXXXX, not PC==0x008XXXXX
void RDiskCopy24(char *source, char *dest, unsigned long count) {
char mode = true32b;
SwapMMUMode(&mode);
BlockMove(source, dest, count);
@ -36,9 +38,7 @@ void Copy24(char *source, char *dest, unsigned long count) {
typedef struct RDiskStorage_s {
DrvSts2 drvsts;
ROMDiskCopy_t copy24;
char init_done;
Ptr copy24_alloc;
char *ramdisk;
Ptr ramdisk_alloc;
char ramdisk_valid;
@ -66,18 +66,6 @@ OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
d->dCtlStorage = NewHandleSysClear(sizeof(RDiskStorage_t));
if (!d->dCtlStorage) { return openErr; }
// Allocate space for 24-bit copy routine in system heap and move it there
c->copy24_alloc = NewPtrSys(Copy24Size);
if (!c->copy24_alloc) {
if (d->dCtlStorage) {
HUnlock(d->dCtlStorage);
DisposeHandle(d->dCtlStorage);
}
return openErr;
}
BlockMove(&Copy24, c->copy24_alloc, Copy24Size);
c->copy24 = (ROMDiskCopy_t)StripAddress(c->copy24_alloc);
// Lock our storage struct and get master pointer
HLock(d->dCtlStorage);
c = *(RDiskStorage_t**)d->dCtlStorage;
@ -153,8 +141,6 @@ static OSErr RDiskInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
if (dq->dQRefNum == d->dCtlRefNum) {
Dequeue((QElemPtr)dq, QHead);
if (c->ramdisk_alloc) { DisposePtr(c->ramdisk_alloc); }
if (c->copy24_alloc) { DisposePtr(c->copy24_alloc); }
HUnlock(d->dCtlStorage);
DisposeHandle(d->dCtlStorage);
}
d->dCtlStorage = NULL;
@ -170,6 +156,8 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
char cmd;
char *disk;
unsigned long offset;
ROMDiskCopy_t copy24 = RDiskCopy24;
// Return disk offline error if dCtlStorage null
if (!d->dCtlStorage) { return offLinErr; }
@ -208,7 +196,7 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
if (*MMU32bit) { BlockMove(disk, (char*)p->ioBuffer, p->ioReqCount); }
else { // 24-bit addressing
char *buffer = (char*)Translate24To32(StripAddress(p->ioBuffer));
c->copy24(disk, buffer, p->ioReqCount);
copy24(disk, buffer, p->ioReqCount);
}
// Update count
p->ioActCount = p->ioReqCount;
@ -221,7 +209,7 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
if (*MMU32bit) { BlockMove((char*)p->ioBuffer, disk, p->ioReqCount); }
else { // 24-bit addressing
char *buffer = (char*)Translate24To32(StripAddress(p->ioBuffer));
c->copy24(buffer, disk, p->ioReqCount);
copy24(buffer, disk, p->ioReqCount);
}
// Update count and position/offset
p->ioActCount = p->ioReqCount;
@ -261,9 +249,10 @@ static OSErr RDiskAccRun(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// Mark write protected if we couldn't allocate RAM buffer?
c->drvsts.writeProt = -1;
} else if (c->ramdisk && !c->ramdisk_valid) { // Else if buffer exists but is not valid,
ROMDiskCopy_t copy24 = RDiskCopy24;
// Copy ROM disk to RAM disk buffer if not yet copied
if (*MMU32bit) { BlockMove(RDiskBuf, c->ramdisk, RDiskSize); }
else { c->copy24(RDiskBuf, c->ramdisk, RDiskSize); }
else { copy24(RDiskBuf, c->ramdisk, RDiskSize); }
c->ramdisk_valid = 1;
}
@ -306,7 +295,6 @@ OSErr RDiskClose(IOParamPtr p, DCtlPtr d) {
if (d->dCtlStorage) {
RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
if (c->ramdisk_alloc) { DisposePtr(c->ramdisk_alloc); }
if (c->copy24_alloc) { DisposePtr(c->copy24_alloc); }
HUnlock(d->dCtlStorage);
DisposeHandle(d->dCtlStorage);
}