mirror of
https://github.com/garrettsworkshop/MacIIROMDiskDriver.git
synced 2024-10-31 15:05:57 +00:00
322 lines
10 KiB
C
322 lines
10 KiB
C
#include <Memory.h>
|
|
#include <Devices.h>
|
|
#include <Files.h>
|
|
#include <Disks.h>
|
|
#include <Errors.h>
|
|
#include <Events.h>
|
|
#include <OSUtils.h>
|
|
|
|
#include "rdisk.h"
|
|
|
|
// Decode keyboard/PRAM settings
|
|
static void RDDecodeSettings(Ptr unmountEN, Ptr mountEN, Ptr ramEN, Ptr dbgEN, Ptr cdromEN) {
|
|
// Read PRAM
|
|
char legacy_startup, legacy_ram;
|
|
RDiskReadXPRAM(1, 4, &legacy_startup);
|
|
RDiskReadXPRAM(1, 5, &legacy_ram);
|
|
|
|
// Decode settings: unmount (don't boot), mount (after boot), RAM disk
|
|
if (RDiskIsRPressed()) { // R boots from ROM disk
|
|
*unmountEN = 0; // Don't unmount so we boot from this drive
|
|
*mountEN = 0; // No need to mount later since we are boot disk
|
|
*ramEN = RDiskIsAPressed(); // A enables RAM disk
|
|
} else {
|
|
if (legacy_startup & 0x01) { // Boot from ROM disk
|
|
*unmountEN = 0; // Don't unmount so we boot from this drive
|
|
*mountEN = 0; // No need to mount later since we are boot disk
|
|
*ramEN = legacy_ram & 0x01;
|
|
} else if (legacy_startup & 0x02) { // Mount ROM disk
|
|
*unmountEN = 1; // Unmount to not boot from our disk
|
|
*mountEN = 1; // Mount in accRun
|
|
*ramEN = legacy_ram & 0x01;
|
|
} else {
|
|
*unmountEN = 1; // Unmount
|
|
*mountEN = 0; // Don't mount again
|
|
*ramEN = 0; // Don't allocate RAM disk
|
|
}
|
|
}
|
|
|
|
// MacsBug enabled if bit 3 == 1 or DBGDis addr invalid or not boot
|
|
*dbgEN = *unmountEN ||
|
|
(legacy_startup & 0x04) ||
|
|
(*RDiskDBGDisPos == 0);
|
|
|
|
// CDROM enabled if bit 3 == 0 or CDROMDis addr invalid or not boot
|
|
*cdromEN = *unmountEN ||
|
|
!(legacy_startup & 0x08) ||
|
|
(*RDiskCDROMDisPos == 0);
|
|
}
|
|
|
|
// Switch to 32-bit mode and copy
|
|
#pragma parameter RDCopy24(__A0, __A1, __D0)
|
|
void RDCopy24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
|
|
char mode = true32b;
|
|
SwapMMUMode(&mode);
|
|
BlockMove(sourcePtr, destPtr, byteCount);
|
|
SwapMMUMode(&mode);
|
|
}
|
|
|
|
// Figure out the first available drive number >= 5
|
|
static int RDFindDrvNum() {
|
|
DrvQElPtr dq;
|
|
int drvNum = 5;
|
|
for (dq = (DrvQElPtr)(GetDrvQHdr())->qHead; dq; dq = (DrvQElPtr)dq->qLink) {
|
|
if (dq->dQDrive >= drvNum) { drvNum = dq->dQDrive + 1; }
|
|
}
|
|
return drvNum;
|
|
}
|
|
|
|
#pragma parameter __D0 RDOpen(__A0, __A1)
|
|
OSErr RDOpen(IOParamPtr p, DCtlPtr d) {
|
|
int drvNum;
|
|
RDiskStorage_t *c;
|
|
char legacy_startup;
|
|
|
|
// Do nothing if already opened
|
|
if (d->dCtlStorage) { return noErr; }
|
|
|
|
// Do nothing if inhibited
|
|
RDiskReadXPRAM(1, 4, &legacy_startup);
|
|
if (legacy_startup & 0x80) { return noErr; }
|
|
|
|
// 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;
|
|
|
|
// Find first available drive number
|
|
drvNum = RDFindDrvNum();
|
|
|
|
// Set drive status
|
|
//c->status.track = 0;
|
|
c->status.writeProt = -1; // nonzero is write protected
|
|
c->status.diskInPlace = 8; // 8 is nonejectable disk
|
|
c->status.installed = 1; // drive installed
|
|
//c->status.sides = 0;
|
|
//c->status.qType = 1;
|
|
c->status.dQDrive = drvNum;
|
|
//c->status.dQFSID = 0;
|
|
c->status.dQRefNum = d->dCtlRefNum;
|
|
c->status.driveSize = RDiskSize / 512;
|
|
//c->status.driveS1 = (RDiskSize / 512) >> 16;
|
|
|
|
// Decompress icon
|
|
#ifdef RDISK_COMPRESS_ICON_ENABLE
|
|
char *src = &RDiskIconCompressed[0];
|
|
char *dst = &c->icon[0];
|
|
UnpackBits(&src, &dst, RDISK_ICON_SIZE);
|
|
#endif
|
|
|
|
// Add drive to drive queue and return
|
|
RDiskAddDrive(c->status.dQRefNum, drvNum, (DrvQElPtr)&c->status.qLink);
|
|
return noErr;
|
|
}
|
|
|
|
// Init is called at beginning of first prime (read/write) call
|
|
static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
|
|
char unmountEN, mountEN, ramEN, dbgEN, cdromEN;
|
|
// Mark init done
|
|
c->initialized = 1;
|
|
// Decode settings
|
|
RDDecodeSettings(&unmountEN, &mountEN, &ramEN, &dbgEN, &cdromEN);
|
|
// Set debug and CD-ROM enable flags in storage struct
|
|
c->dbgEN = dbgEN;
|
|
c->cdromEN = cdromEN;
|
|
// Clear debug and CD-ROM overwrite flags
|
|
c->dbgOverwrite = 0;
|
|
c->cdromOverwrite = 0;
|
|
|
|
// If RAM disk enabled, try to allocate RAM disk buffer if not already
|
|
if (ramEN & !c->ramdisk) {
|
|
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 BufPtr
|
|
*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 { // 24-bit mode
|
|
// Put RAM disk just past 8MB
|
|
c->ramdisk = (Ptr)(8 * 1024 * 1024);
|
|
// Copy ROM disk image to RAM disk
|
|
copy24(RDiskBuf, 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
|
|
}
|
|
}
|
|
|
|
// Unmount if not booting from ROM disk
|
|
if (unmountEN) { c->status.diskInPlace = 0; }
|
|
|
|
// If mount enabled, enable accRun to post disk inserted event later
|
|
if (mountEN) {
|
|
d->dCtlDelay = 150; // Set accRun delay (150 ticks is 2.5 sec.)
|
|
d->dCtlFlags |= dNeedTimeMask; // Enable accRun
|
|
}
|
|
}
|
|
|
|
#pragma parameter __D0 RDPrime(__A0, __A1)
|
|
OSErr RDPrime(IOParamPtr p, DCtlPtr d) {
|
|
RDiskStorage_t *c;
|
|
char cmd;
|
|
Ptr disk;
|
|
|
|
// Return disk offline error if dCtlStorage null
|
|
if (!d->dCtlStorage) { return notOpenErr; }
|
|
// Dereference dCtlStorage to get pointer to our context
|
|
c = *(RDiskStorage_t**)d->dCtlStorage;
|
|
|
|
// Initialize if this is the first prime call
|
|
if (!c->initialized) { RDInit(p, d, c); }
|
|
|
|
// Return disk offline error if virtual disk not inserted
|
|
if (!c->status.diskInPlace) { return offLinErr; }
|
|
|
|
// Get pointer to RAM or ROM disk buffer
|
|
disk = (c->ramdisk ? c->ramdisk : RDiskBuf) + d->dCtlPosition;
|
|
// Bounds checking
|
|
if (d->dCtlPosition >= RDiskSize || p->ioReqCount >= RDiskSize ||
|
|
d->dCtlPosition + p->ioReqCount >= RDiskSize) { return paramErr; }
|
|
|
|
// Service read or write request
|
|
cmd = p->ioTrap & 0x00FF;
|
|
if (cmd == aRdCmd) { // Read
|
|
// Read from disk into buffer.
|
|
if (*MMU32bit) { BlockMove(disk, p->ioBuffer, p->ioReqCount); }
|
|
else { copy24(disk, StripAddress(p->ioBuffer), p->ioReqCount); }
|
|
|
|
if (!c->dbgEN && !c->dbgOverwrite &&
|
|
*RDiskDBGDisPos >= d->dCtlPosition &&
|
|
*RDiskDBGDisPos < d->dCtlPosition + p->ioReqCount) {
|
|
p->ioBuffer[*RDiskDBGDisPos - d->dCtlPosition] = *RDiskDBGDisByte;
|
|
}
|
|
if (!c->cdromEN && !c->cdromOverwrite &&
|
|
*RDiskCDROMDisPos >= d->dCtlPosition &&
|
|
*RDiskCDROMDisPos < d->dCtlPosition + p->ioReqCount) {
|
|
p->ioBuffer[*RDiskCDROMDisPos - d->dCtlPosition] = *RDiskCDROMDisByte;
|
|
}
|
|
} else if (cmd == aWrCmd) { // Write
|
|
// Fail if write protected or RAM disk buffer not set up
|
|
if (c->status.writeProt || !c->ramdisk) { return wPrErr; }
|
|
// Write from buffer into disk.
|
|
if (*MMU32bit) { BlockMove(p->ioBuffer, disk, p->ioReqCount); }
|
|
else { copy24(StripAddress(p->ioBuffer), disk, p->ioReqCount); }
|
|
|
|
if (*RDiskDBGDisPos >= d->dCtlPosition &&
|
|
*RDiskDBGDisPos < d->dCtlPosition + p->ioReqCount) {
|
|
c->dbgOverwrite = 1;
|
|
}
|
|
if (*RDiskCDROMDisPos >= d->dCtlPosition &&
|
|
*RDiskCDROMDisPos < d->dCtlPosition + p->ioReqCount) {
|
|
c->cdromOverwrite = 1;
|
|
}
|
|
} else { return noErr; } //FIXME: Fail if cmd isn't read or write?
|
|
|
|
// Update count and position/offset, then return
|
|
d->dCtlPosition += p->ioReqCount;
|
|
p->ioActCount = p->ioReqCount;
|
|
return noErr;
|
|
}
|
|
|
|
#pragma parameter __D0 RDCtl(__A0, __A1)
|
|
OSErr RDCtl(CntrlParamPtr p, DCtlPtr d) {
|
|
RDiskStorage_t *c;
|
|
// Fail if dCtlStorage null
|
|
if (!d->dCtlStorage) { return notOpenErr; }
|
|
// Dereference dCtlStorage to get pointer to our context
|
|
c = *(RDiskStorage_t**)d->dCtlStorage;
|
|
// Handle control request based on csCode
|
|
switch (p->csCode) {
|
|
case killCode:
|
|
return noErr;
|
|
case kFormat:
|
|
if (!c->status.diskInPlace || c->status.writeProt ||
|
|
!c->ramdisk) { return controlErr; }
|
|
long zero[32];
|
|
for (int i = 0; i < 32; i++) { zero[i] = 0; }
|
|
for (int i = 0; i < 32; i++) {
|
|
copy24((Ptr)zero, c->ramdisk + i * sizeof(zero), sizeof(zero));
|
|
}
|
|
return noErr;
|
|
case kVerify:
|
|
if (!c->status.diskInPlace) { return controlErr; }
|
|
return noErr;
|
|
case kEject:
|
|
// "Reinsert" disk if ejected illegally
|
|
if (c->status.diskInPlace) {
|
|
PostEvent(diskEvt, c->status.dQDrive);
|
|
}
|
|
return controlErr; // Eject not allowed so return error
|
|
case accRun:
|
|
d->dCtlFlags &= ~dNeedTimeMask; // Disable accRun
|
|
c->status.diskInPlace = 8; // 8 is nonejectable disk
|
|
PostEvent(diskEvt, c->status.dQDrive); // Post disk inserted event
|
|
return noErr;
|
|
case kDriveIcon: case kMediaIcon: // Get icon
|
|
#ifdef RDISK_COMPRESS_ICON_ENABLE
|
|
*(Ptr*)p->csParam = (Ptr)c->icon;
|
|
#else
|
|
*(Ptr*)p->csParam = (Ptr)RDiskIcon;
|
|
#endif
|
|
return noErr;
|
|
case kDriveInfo:
|
|
// high word (bytes 2 & 3) clear
|
|
// byte 1 = primary + fixed media + internal
|
|
// byte 0 = drive type (0x10 is RAM disk) / (0x11 is ROM disk)
|
|
if (c->status.writeProt) { *(long*)p->csParam = 0x00000411; }
|
|
else { *(long*)p->csParam = 0x00000410; }
|
|
return noErr;
|
|
case 24: // Return SCSI partition size
|
|
*(long*)p->csParam = RDiskSize / 512;
|
|
return noErr;
|
|
case 2351: // Post-boot
|
|
c->initialized = 1; // Skip initialization
|
|
d->dCtlDelay = 30; // Set accRun delay (30 ticks is 0.5 sec.)
|
|
d->dCtlFlags |= dNeedTimeMask; // Enable accRun
|
|
return noErr;
|
|
default: return controlErr;
|
|
}
|
|
}
|
|
|
|
#pragma parameter __D0 RDStat(__A0, __A1)
|
|
OSErr RDStat(CntrlParamPtr p, DCtlPtr d) {
|
|
RDiskStorage_t *c;
|
|
// Fail if dCtlStorage null
|
|
if (!d->dCtlStorage) { return notOpenErr; }
|
|
// Dereference dCtlStorage to get pointer to our context
|
|
c = *(RDiskStorage_t**)d->dCtlStorage;
|
|
// Handle status request based on csCode
|
|
switch (p->csCode) {
|
|
case kDriveStatus:
|
|
BlockMove(*d->dCtlStorage, &p->csParam, sizeof(DrvSts2));
|
|
return noErr;
|
|
default: return statusErr;
|
|
}
|
|
}
|
|
|
|
#pragma parameter __D0 RDClose(__A0, __A1)
|
|
OSErr RDClose(IOParamPtr p, DCtlPtr d) {
|
|
// If dCtlStorage not null, dispose of it
|
|
if (!d->dCtlStorage) { return noErr; }
|
|
RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
|
|
HUnlock(d->dCtlStorage);
|
|
DisposeHandle(d->dCtlStorage);
|
|
d->dCtlStorage = NULL;
|
|
return noErr;
|
|
}
|