Macintosh-HW/MacIIROMDiskDriver
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Works in 24 and 32 bit modes but no PRAM settings

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This commit is contained in:
Zane Kaminski 2020-06-27 15:53:56 -04:00
parent 6a8d111d60
commit 87d77d5005
4 changed files with 78 additions and 117 deletions
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bin/driver.bin
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bin/rom.bin
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183
rdisk.c
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@ -39,7 +39,7 @@ const long RDiskIcon[65] = {
0b10001111001111000001111001111001,
0b11000000000000000000000000000001,
0b01010101010101011101010101010101,
0b01111111111111111111111111111111,
0b01111111111111110111111111111111,
0b00000000000000000000000000000000,
0b00000000000000000000000000000000,
// Mask
@ -78,28 +78,19 @@ const long RDiskIcon[65] = {
0
};
// Switch to 24-bit mode and copy. Call this with
// PC==0x408XXXXX, not PC==0x008XXXXX
void RDiskCopy24(char *sourcePtr, char *destPtr, unsigned long byteCount) {
// Switch to 24-bit mode and copy
void RDiskCopy24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
char mode = true32b;
SwapMMUMode(&mode);
BlockMove(sourcePtr, destPtr, byteCount);
SwapMMUMode(&mode);
}
typedef struct RDiskStorage_s {
DrvSts2 drvsts;
unsigned long init_done;
char *ramdisk;
Ptr ramdisk_alloc;
char ramdisk_valid;
} RDiskStorage_t;
#pragma parameter __D0 RDiskOpen(__A0, __A1)
OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
DrvQElPtr dq;
DrvSts2 *status;
int drvNum;
Ptr copy24;
RDiskStorage_t *c;
// Do nothing if already opened
@ -114,6 +105,11 @@ OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
// Allocate storage struct
d->dCtlStorage = NewHandleSysClear(sizeof(RDiskStorage_t));
if (!d->dCtlStorage) { return openErr; }
// Allocate copy function buffer and copy RDiskCopy24 to it
copy24 = NewPtrSys(64);
if (!copy24) { DisposeHandle(d->dCtlStorage); return openErr; }
BlockMove(&RDiskCopy24, copy24, 64);
// Lock our storage struct and get master pointer
HLock(d->dCtlStorage);
@ -122,17 +118,15 @@ OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
// Initialize storage struct fields
c->init_done = 0;
c->ramdisk = NULL;
c->ramdisk_alloc = NULL;
c->ramdisk_valid = 0;
c->copy24 = (RDiskCopy_t)copy24;
// Set drive status
status = &c->drvsts;
status->writeProt = 0xF0;
status->diskInPlace = 0x08;
status->dQDrive = drvNum;
status->dQRefNum = d->dCtlRefNum;
status->driveSize = (RDiskSize / 512) & 0xFFFF;
status->driveS1 = ((RDiskSize / 512) & 0xFFFF0000) >> 16;
c->status.writeProt = -1;
c->status.diskInPlace = 0x08;
c->status.dQDrive = drvNum;
c->status.dQRefNum = d->dCtlRefNum;
c->status.driveSize = RDiskSize / 512;
c->status.driveS1 = (RDiskSize / 512) >> 16;
// Set driver flags?
/* d->dCtlFlags |= dReadEnableMask | dWritEnableMask |
@ -140,7 +134,7 @@ OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
dNeedLockMask; // 0x4F */
// Add drive to drive queue and return
RDiskAddDrive(status->dQRefNum, drvNum, (DrvQElPtr)&status->qLink);
RDiskAddDrive(c->status.dQRefNum, drvNum, (DrvQElPtr)&c->status.qLink);
return noErr;
}
@ -151,61 +145,64 @@ OSErr RDiskInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
c->init_done = 1;
// Read PRAM
RDiskReadXPRAM(1, 4, &startup);
RDiskReadXPRAM(1, 5, &ram);
/*RDiskReadXPRAM(1, 4, &startup);
RDiskReadXPRAM(1, 5, &ram);*/
// Either enable ROM disk or remove ourselves from the drive queue
if (startup || RDiskIsRPressed()) { // If ROM disk boot set in PRAM or R pressed,*/
if (/*startup || */RDiskIsRPressed()) { // If ROM disk boot set in PRAM or R pressed,*/
// Set ROM disk attributes
c->drvsts.writeProt = -1; // Set write protected
// Clear disk fields (even though we used NewHandleSysClear)
c->ramdisk = NULL;
c->ramdisk_alloc = NULL;
c->ramdisk_valid = 0;
c->status.writeProt = -1; // Set write protected
// If RAM disk set in PRAM or A pressed, enable RAM disk
if (ram || RDiskIsAPressed()) {
unsigned long minBufPtr, newBufPtr;
// Clearing write protect marks RAM disk enabled
c->drvsts.writeProt = 0;
// Compute if there is enough high memory
minBufPtr = ((unsigned long)*MemTop / 2) + 1024;
newBufPtr = (unsigned long)*BufPtr - RDiskSize;
// If in 32-bit mode and there is enough high memory, set ramdisk pointer now
if (*MMU32bit & newBufPtr > minBufPtr && (unsigned long)*BufPtr > newBufPtr) {
// Allocate RAM disk buffer by lowering BufPtr
*BufPtr = (Ptr)newBufPtr;
// Set RAM disk buffer pointer. Defer copying until accRun
// Don't set ramdisk_alloc because there is nothing to free.
c->ramdisk = *BufPtr;
if (/*ram || */RDiskIsAPressed()) {
// Try to allocate RAM disk buffer
if (*MMU32bit) { // 32-bit mode
unsigned long minBufPtr, newBufPtr;
// Compute if there is enough high memory
minBufPtr = ((unsigned long)*MemTop / 2) + 1024;
newBufPtr = (unsigned long)*BufPtr - RDiskSize;
if (newBufPtr > minBufPtr && (unsigned long)*BufPtr > newBufPtr) {
// Allocate RAM disk buffer by lowering BufPtrå
*BufPtr = (Ptr)newBufPtr;
// Set RAM disk buffer pointer.
c->ramdisk = *BufPtr;
// Copy ROM disk image to RAM disk
BlockMove(RDiskBuf, c->ramdisk, RDiskSize);
// Clearing write protect marks RAM disk enabled
c->status.writeProt = 0;
} else {
// Not enough memory so stay write-only
c->status.writeProt = -1;
}
} else { // 24-bit mode
// Put RAM disk just past 8MB
c->ramdisk = (char*)(8 * 1024 * 1024);
// Copy ROM disk image to RAM disk
BlockMove(RDiskBuf, c->ramdisk, RDiskSize);
c->ramdisk_valid = 1;
} else {
// Enable accRun to allocate and copy later
d->dCtlFlags |= dNeedTimeMask;
d->dCtlDelay = 0x10;
((RDiskCopy_t)StripAddress(c->copy24))(
RDiskBuf, StripAddress(c->ramdisk), RDiskSize);
// Clearing write protect marks RAM disk enabled
c->status.writeProt = 0;
//FIXME: what if we don't have enough RAM?
// Will this wrap around and overwrite low memory?
// That's not the worst, since the system would just crash,
// but it would be better to switch to read-only status
}
}
return noErr;
} else { // Otherwise if R not held down and ROM boot not set in PRAM,
QHdrPtr head = GetDrvQHdr();
DrvQElPtr dq = (DrvQElPtr)head->qHead;
// Remove our driver from the drive queue
DrvQElPtr dq;
QHdrPtr QHead = DrvQHdr;
// Loop through entire drive queue, searching for our device or stopping at the end.
dq = (DrvQElPtr)QHead->qHead;
while ((dq != (DrvQElPtr)(QHead->qTail)) &&
// Loop through entire drive queue, searching for our device
while ((dq != (DrvQElPtr)(head->qTail)) &&
(dq->dQRefNum != d->dCtlRefNum)) {
dq = (DrvQElPtr)(dq->qLink);
}
// If we found our driver, remove it from the queue
if (dq->dQRefNum == d->dCtlRefNum) {
Dequeue((QElemPtr)dq, QHead);
if (c->ramdisk_alloc) { DisposePtr(c->ramdisk_alloc); }
Dequeue((QElemPtr)dq, head);
DisposeHandle(d->dCtlStorage);
}
d->dCtlStorage = NULL;
// Return disk offline error
return offLinErr;
}
@ -217,7 +214,6 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
char cmd;
char *disk;
long offset;
RDiskCopy_t copy24 = &RDiskCopy24;
// Return disk offline error if dCtlStorage null
if (!d->dCtlStorage) { return offLinErr; }
@ -231,7 +227,7 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
}
// Get pointer to RAM or ROM disk buffer
disk = c->ramdisk && c->ramdisk_valid ? c->ramdisk : RDiskBuf;
disk = c->ramdisk ? c->ramdisk : RDiskBuf;
// Add offset to buffer pointer according to positioning mode
switch (p->ioPosMode & 0x000F) {
case fsAtMark: offset = d->dCtlPosition; break;
@ -250,14 +246,14 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
if (cmd == aRdCmd) { // Read
// Return immediately if verify operation requested
//FIXME: follow either old (verify) or new (read uncached) convention
/*if (p->ioPosMode & rdVerifyMask) {
if (p->ioPosMode & rdVerifyMask) {
return noErr;
}*/
}
// Read from disk into buffer.
if (*MMU32bit) { BlockMove(disk, p->ioBuffer, p->ioReqCount); }
else { // 24-bit addressing
char *buffer = (char*)Translate24To32(StripAddress(p->ioBuffer));
copy24(disk, buffer, p->ioReqCount);
else {
((RDiskCopy_t)StripAddress(c->copy24))(
disk, StripAddress(p->ioBuffer), p->ioReqCount);
}
// Update count
p->ioActCount = p->ioReqCount;
@ -266,12 +262,12 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
return noErr;
} else if (cmd == aWrCmd) { // Write
// Fail if write protected or RAM disk buffer not set up
if (c->drvsts.writeProt || !c->ramdisk || !c->ramdisk_valid) { return wPrErr; }
if (c->status.writeProt || !c->ramdisk) { return wPrErr; }
// Write from buffer into disk.
if (*MMU32bit) { BlockMove((char*)p->ioBuffer, disk, p->ioReqCount); }
else { // 24-bit addressing
char *buffer = (char*)Translate24To32(StripAddress(p->ioBuffer));
copy24(buffer, disk, p->ioReqCount);
if (*MMU32bit) { BlockMove(p->ioBuffer, disk, p->ioReqCount); }
else {
((RDiskCopy_t)StripAddress(c->copy24))(
StripAddress(p->ioBuffer), disk, p->ioReqCount);
}
// Update count and position/offset
p->ioActCount = p->ioReqCount;
@ -282,47 +278,6 @@ OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
//FIXME: Should we fail if cmd isn't read or write?
}
OSErr RDiskAccRun(CntrlParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// Disable accRun
d->dCtlDelay = 0;
d->dCtlFlags &= ~dNeedTimeMask;
RDiskBreak();
// Set RAM disk buffer if our disk is writable and no RAM buffer set
if (!c->drvsts.writeProt && !c->ramdisk) {
if (*MMU32bit) { // If in 32-bit mode, (implies System 7)
// Allocate RAM disk buffer on system heap (System 7 can resize system heap)
c->ramdisk_alloc = NewPtrSys(RDiskSize);
if (c->ramdisk_alloc) { // If allocation successful,
// Set RAM disk buffer pointer
c->ramdisk = c->ramdisk_alloc;
}
} else { // Otherwise in 24-bit mode,
// Put buffer just beyond the 8 MB of RAM which is usable in 24-bit mode
c->ramdisk = (char*)(8 * 1024 * 1024);
//FIXME: what if we don't have enough RAM?
// Will this wrap around and overwrite low memory?
// That's not the worst, since the system would just crash,
// but it would be better to switch to read-only status
}
// Clear ramdisk_valid just in case, since ROM disk not yet copied to RAM disk
c->ramdisk_valid = 0;
}
if (!c->ramdisk) { // If RAM disk buffer couldn't be allocated,
// 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,
RDiskCopy_t copy24 = RDiskCopy24;
// Copy ROM disk to RAM disk buffer if not yet copied
if (*MMU32bit) { BlockMove(RDiskBuf, c->ramdisk, RDiskSize); }
else { copy24(RDiskBuf, c->ramdisk, RDiskSize); }
c->ramdisk_valid = 1;
}
return noErr; // Always return success
}
#pragma parameter __D0 RDiskControl(__A0, __A1)
OSErr RDiskControl(CntrlParamPtr p, DCtlPtr d) {
RDiskStorage_t *c;
@ -361,7 +316,7 @@ OSErr RDiskClose(IOParamPtr p, DCtlPtr d) {
// If dCtlStorage not null, dispose of it and its contents
if (!d->dCtlStorage) { return noErr; }
RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
if (c->ramdisk_alloc) { DisposePtr(c->ramdisk_alloc); }
if (c->copy24) { DisposePtr((Ptr)c->copy24); }
HUnlock(d->dCtlStorage);
DisposeHandle(d->dCtlStorage);
d->dCtlStorage = NULL;

12
rdisk.h
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@ -7,9 +7,8 @@
#define MemTop ((Ptr*)0x108)
#define MMU32bit ((char*)0xCB2)
#define JIODone ((char*)0x8FC)
#define DrvQHdr ((QHdrPtr)0x308)
#pragma parameter __D0 RDReadXPRAM(__D0, __D1, __A0)
#pragma parameter __D0 RDiskReadXPRAM(__D0, __D1, __A0)
OSErr RDiskReadXPRAM(short numBytes, short whichByte, void *dest) = {0x4840, 0x3001, 0xA051};
// Other definition of RDiskAddDrive with register calling convention
@ -34,6 +33,13 @@ inline char RDiskIsAPressed() { return *((char*)0x174) & 0x01; }
void RDiskBreak() = { 0xA9FF };
typedef void (*RDiskCopy_t)(char *, char *, unsigned long);
typedef void (*RDiskCopy_t)(Ptr, Ptr, unsigned long);
typedef struct RDiskStorage_s {
DrvSts2 status;
unsigned long init_done;
char *ramdisk;
RDiskCopy_t copy24;
} RDiskStorage_t;
#endif