MacIIROMDiskDriver/rdisk.c

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#include <Memory.h>
#include <Devices.h>
#include <Files.h>
#include <Disks.h>
#include <Errors.h>
#include <Events.h>
#include <OSUtils.h>
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#include "rdtraps.h"
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// This function is here just to put padding at the
// beginning of the output file
void GWROMDisk() {
StripAddress(&GWROMDisk);
StripAddress(&GWROMDisk);
StripAddress(&GWROMDisk);
StripAddress(&GWROMDisk);
StripAddress(&GWROMDisk);
StripAddress(&GWROMDisk);
}
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#define RDiskSize (0x00180000L)
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#define RDiskBuf ((char*)0x40880000)
#define BufPtr ((Ptr*)0x10C)
#define MemTop ((Ptr*)0x108)
#define MMU32bit ((char*)0x0CB2)
typedef void (*ROMDiskCopy_t)(char *, char *, unsigned long);
// Switch to 24-bit mode and copy. Call this with
// PC==0x408XXXXX, not PC==0x008XXXXX
void RDiskCopy24(char *sourcePtr, char *destPtr, unsigned long byteCount) {
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char mode = true32b;
SwapMMUMode(&mode);
BlockMove(sourcePtr, destPtr, byteCount);
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SwapMMUMode(&mode);
}
typedef struct RDiskStorage_s {
DrvSts2 drvsts;
char init_done;
char *ramdisk;
Ptr ramdisk_alloc;
char ramdisk_valid;
} RDiskStorage_t;
#pragma parameter __D0 RDiskOpen(__A0, __A1)
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OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
DrvQElPtr dq;
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DrvSts2 *status;
int drvNum;
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RDiskStorage_t *c;
// Do nothing if already opened
if (d->dCtlStorage) { return noErr; }
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// Reference GWROMDisk() just so it ends up
// at the beginning of the output file
StripAddress(&GWROMDisk);
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// Figure out first available drive number
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drvNum = 1;
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for (dq = (DrvQElPtr)(GetDrvQHdr())->qHead; dq; dq = (DrvQElPtr)dq->qLink) {
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if (dq->dQDrive >= drvNum) { drvNum = dq->dQDrive + 1; }
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}
// Allocate storage struct
d->dCtlStorage = NewHandleSysClear(sizeof(RDiskStorage_t));
if (!d->dCtlStorage) { return openErr; }
// Lock our storage struct and get master pointer
HLock(d->dCtlStorage);
c = *(RDiskStorage_t**)d->dCtlStorage;
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// Initialize storage struct fields
c->init_done = 0;
c->ramdisk = NULL;
c->ramdisk_alloc = NULL;
c->ramdisk_valid = 0;
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// Set drive status
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status->writeProt = 0xF0;
status->diskInPlace = 0x08;
status->dQDrive = drvNum;
status->dQRefNum = d->dCtlRefNum;
status->driveSize = (RDiskSize / 512) & 0xFFFF;
status->driveS1 = ((RDiskSize / 512) & 0xFFFF0000) >> 16;
// Set driver flags?
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/* d->dCtlFlags |= dReadEnableMask | dWritEnableMask |
dCtlEnableMask | dStatEnableMask |
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dNeedLockMask; // 0x4F */
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// Add drive to drive queue and return
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RDAddDrive(status->dQRefNum, drvNum, (DrvQElPtr)&status->qLink);
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return noErr;
}
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OSErr RDiskInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
char startup = 0, ram = 0;
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// Mark init done
c->init_done = 1;
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// Read PRAM
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RDReadXPRAM(1, 4, &startup);
RDReadXPRAM(1, 5, &ram);
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// Either enable ROM disk or remove ourselves from the drive queue
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if (startup || RDIsRPressed()) { // If ROM disk boot set in PRAM or R pressed,
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// Set ROM disk attributes
c->drvsts.writeProt = -1; // Set write protected
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// Clear disk fields (even though we used NewHandleSysClear)
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c->ramdisk = NULL;
c->ramdisk_alloc = NULL;
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c->ramdisk_valid = 0;
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// If RAM disk set in PRAM or A pressed, enable RAM disk
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if (ram || RDISAPressed()) {
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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;
}
// Enable accRun to allocate and copy later
d->dCtlFlags |= dNeedTimeMask;
d->dCtlDelay = 0x10;
}
return noErr;
} else { // Otherwise if R not held down and ROM boot not set in PRAM,
// Remove our driver from the drive queue
DrvQElPtr dq;
QHdrPtr QHead = (QHdrPtr)0x308;
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// Loop through entire drive queue, searching for our device or stopping at the end.
dq = (DrvQElPtr)QHead->qHead;
while((dq != (DrvQElPtr)(QHead->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); }
DisposeHandle(d->dCtlStorage);
}
d->dCtlStorage = NULL;
// Return disk offline error
return offLinErr;
}
}
#pragma parameter __D0 RDiskPrime(__A0, __A1)
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OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
RDiskStorage_t *c;
char cmd;
char *disk;
unsigned long offset;
ROMDiskCopy_t copy24 = RDiskCopy24;
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// Return disk offline error if dCtlStorage null
if (!d->dCtlStorage) { return offLinErr; }
// Dereference dCtlStorage to get pointer to our context
c = *(RDiskStorage_t**)d->dCtlStorage;
// Initialize if this is the first prime call
if (!c->init_done) {
OSErr ret = RDiskInit(p, d, c);
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if (ret != noErr) { return ret; }
}
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// Get pointer to RAM or ROM disk buffer
disk = c->ramdisk && c->ramdisk_valid ? c->ramdisk : RDiskBuf;
// Add offset to buffer pointer according to positioning mode
switch (p->ioPosMode & 0x000F) {
case fsAtMark: offset = d->dCtlPosition; break;
case fsFromStart:
offset = p->ioPosOffset;
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//if (offset < 0) { return posErr; }
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break;
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case fsFromMark: offset = d->dCtlPosition + p->ioPosOffset; break;
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default: offset = 0; break; //FIXME: Error if unsupported ioPosMode?
}
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// Bounds checking
/*if (offset >= RDiskSize || p->ioReqCount >= RDiskSize ||
offset + p->ioReqCount >= RDiskSize ||
disk + offset < disk) { return posErr; }*/
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// Service read or write request
cmd = p->ioTrap & 0x00FF;
if (cmd == aRdCmd) { // Read
// Return immediately if verify operation requested
//FIXME: follow either old (verify) or new (read uncached) convention
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if (p->ioPosMode & rdVerifyMask) {
return noErr;
}
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// Read from disk into buffer.
if (*MMU32bit) { BlockMove(disk, (char*)p->ioBuffer, p->ioReqCount); }
else { // 24-bit addressing
char *buffer = (char*)Translate24To32(StripAddress(p->ioBuffer));
copy24(disk, buffer, p->ioReqCount);
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}
// Update count
p->ioActCount = p->ioReqCount;
p->ioPosOffset = d->dCtlPosition = offset + p->ioReqCount;
return noErr;
} else if (cmd == aWrCmd) { // Write
// Fail if write protected or RAM disk buffer not set up
if (c->drvsts.writeProt || disk == 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);
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}
// Update count and position/offset
p->ioActCount = p->ioReqCount;
p->ioPosOffset = d->dCtlPosition = offset + p->ioReqCount;
return noErr;
} else { return noErr; }
//FIXME: Should we fail if cmd isn't read or write?
}
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OSErr RDiskAccRun(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
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// Disable accRun
d->dCtlDelay = 0;
d->dCtlFlags &= ~dNeedTimeMask;
// 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,
ROMDiskCopy_t copy24 = RDiskCopy24;
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// Copy ROM disk to RAM disk buffer if not yet copied
if (*MMU32bit) { BlockMove(RDiskBuf, c->ramdisk, RDiskSize); }
else { copy24(RDiskBuf, c->ramdisk, RDiskSize); }
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c->ramdisk_valid = 1;
}
return noErr; // Always return success
}
#pragma parameter __D0 RDiskControl(__A0, __A1)
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OSErr RDiskControl(IOParamPtr p, DCtlPtr d) {
RDiskStorage_t *c;
// Do nothing if dCtlStorage null
if (!d->dCtlStorage) { return noErr; }
// Dereference dCtlStorage to get pointer to our context
c = *(RDiskStorage_t**)d->dCtlStorage;
// Handle control request based on csCode
switch (((CntrlParamPtr)p)->csCode) {
case accRun: return RDiskAccRun(p, d, c);
default: return controlErr;
}
}
#pragma parameter __D0 RDiskStatus(__A0, __A1)
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OSErr RDiskStatus(IOParamPtr p, DCtlPtr d) {
// Fail if dCtlStorage null or unsupported status call code
if (!d->dCtlStorage) { return statusErr; } //FIXME: Return offLinErr instead?
// Handle status request based on csCode
switch (((CntrlParamPtr)p)->csCode) {
case drvStsCode:
BlockMove(*d->dCtlStorage, &((CntrlParamPtr)p)->csParam, sizeof(DrvSts2));
return noErr;
default: return statusErr;
}
}
#pragma parameter __D0 RDiskClose(__A0, __A1)
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OSErr RDiskClose(IOParamPtr p, DCtlPtr d) {
// If dCtlStorage not null, dispose of it and its contents
if (d->dCtlStorage) {
RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
if (c->ramdisk_alloc) { DisposePtr(c->ramdisk_alloc); }
HUnlock(d->dCtlStorage);
DisposeHandle(d->dCtlStorage);
}
d->dCtlStorage = NULL;
return noErr;
}