mirror of
https://github.com/garrettsworkshop/MacIIROMDiskDriver.git
synced 2024-12-26 12:29:19 +00:00
355 lines
11 KiB
C
355 lines
11 KiB
C
#include <Memory.h>
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#include <Devices.h>
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#include <Files.h>
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#include <Disks.h>
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#include <Errors.h>
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#include <Events.h>
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#include <OSUtils.h>
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#include "rdisk.h"
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// Decode keyboard/PRAM settings
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static void RDDecodeSettings(Ptr unmountEN, Ptr mountEN, Ptr ramEN, Ptr dbgEN, Ptr cdrEN) {
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// Sample R and A keys repeatedly
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char r = 0, a = 0;
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long tmax = TickCount() + 60;
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for (long i = 0; i < 1000000; i++) {
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r |= RDiskIsRPressed();
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a |= RDiskIsAPressed();
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if (r && a) { break; }
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if (TickCount() > tmax) { break; }
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}
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// Read PRAM
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char legacy_startup, legacy_ram;
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RDiskReadXPRAM(1, 4, &legacy_startup);
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RDiskReadXPRAM(1, 5, &legacy_ram);
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// Decode settings: unmount (don't boot), mount (after boot), RAM disk
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if (r) { // R boots from ROM disk
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*unmountEN = 0; // Don't unmount so we boot from this drive
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*mountEN = 0; // No need to mount later since we are boot disk
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*ramEN = a; // A enables RAM disk
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*dbgEN = 0;
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*cdrEN = 1;
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} else {
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if (legacy_startup & 0x01) { // Boot from ROM disk
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*unmountEN = 0; // Don't unmount so we boot from this drive
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*mountEN = 0; // No need to mount later since we are boot disk
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*ramEN = legacy_ram & 0x01; // Allocate RAM disk if bit 0 == 1
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*dbgEN = legacy_startup & 0x04; // MacsBug enabled if bit 2 == 1
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*cdrEN = !(legacy_startup & 0x08); // CD-ROM enabled if bit 3 == 0
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} else if (legacy_startup & 0x02) { // Mount ROM disk
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*unmountEN = 1; // Unmount to not boot from our disk
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*mountEN = 1; // Mount in accRun
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*ramEN = legacy_ram & 0x01; // Allocate RAM disk if bit 0 == 1
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*dbgEN = 1; // CD-ROM ext. always enabled in mount mode
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*cdrEN = 1; // MacsBug always enabled in mount mode
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} else {
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*unmountEN = 1; // Unmount
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*mountEN = 0; // Don't mount again
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*ramEN = 0; // Don't allocate RAM disk
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*dbgEN = 1; // CD-ROM ext. always enabled in unmount mode
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*cdrEN = 1; // MacsBug always enabled in unmount mode
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}
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}
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}
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// Switch to 32-bit mode and copy
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#pragma parameter C24(__A0, __A1, __D0)
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void __attribute__ ((noinline)) C24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
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signed char mode = true32b;
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SwapMMUMode(&mode);
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BlockMove(sourcePtr, destPtr, byteCount);
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SwapMMUMode(&mode);
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}
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// Switch to 32-bit mode and get
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#pragma parameter __D0 G24(__A2)
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char __attribute__ ((noinline)) G24(Ptr pos) {
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long ret;
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signed char mode = true32b;
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SwapMMUMode(&mode);
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ret = *pos; // Peek
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SwapMMUMode(&mode);
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return ret;
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}
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// Switch to 32-bit mode and set
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#pragma parameter S24(__A2, __D3)
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void __attribute__ ((noinline)) S24(Ptr pos, char patch) {
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signed char mode = true32b;
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SwapMMUMode(&mode);
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*pos = patch; // Poke
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SwapMMUMode(&mode);
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}
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// Figure out the first available drive number >= 5
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static int RDFindDrvNum() {
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DrvQElPtr dq;
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int drvNum = 5;
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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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}
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return drvNum;
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}
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#pragma parameter __D0 RDOpen(__A0, __A1)
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OSErr RDOpen(IOParamPtr p, DCtlPtr d) {
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int drvNum;
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RDiskStorage_t *c;
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char legacy_startup;
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// Do nothing if already opened
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if (d->dCtlStorage) { return noErr; }
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// Do nothing if inhibited
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RDiskReadXPRAM(1, 4, &legacy_startup);
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if (legacy_startup & 0x80) { return noErr; }
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// Allocate storage struct
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d->dCtlStorage = NewHandleSysClear(sizeof(RDiskStorage_t));
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if (!d->dCtlStorage) { return openErr; }
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// Lock our storage struct and get master pointer
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HLock(d->dCtlStorage);
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c = *(RDiskStorage_t**)d->dCtlStorage;
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// Find first available drive number
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drvNum = RDFindDrvNum();
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// Set drive status
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//c->status.track = 0;
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c->status.writeProt = -1; // nonzero is write protected
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c->status.diskInPlace = 8; // 8 is nonejectable disk
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c->status.installed = 1; // drive installed
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//c->status.sides = 0;
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//c->status.qType = 1;
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c->status.dQDrive = drvNum;
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//c->status.dQFSID = 0;
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c->status.dQRefNum = d->dCtlRefNum;
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c->status.driveSize = RDiskSize / 512;
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//c->status.driveS1 = (RDiskSize / 512) >> 16;
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// Decompress icon
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#ifdef RDISK_COMPRESS_ICON_ENABLE
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char *src = &RDiskIconCompressed[0];
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char *dst = &c->icon[0];
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UnpackBits(&src, &dst, RDISK_ICON_SIZE);
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#endif
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// Add drive to drive queue and return
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RDiskAddDrive(c->status.dQRefNum, drvNum, (DrvQElPtr)&c->status.qLink);
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return noErr;
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}
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// Init is called at beginning of first prime (read/write) call
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static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
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char unmountEN, mountEN, ramEN, dbgEN, cdrEN;
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// Mark init done
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c->initialized = 1;
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// Decode settings
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RDDecodeSettings(&unmountEN, &mountEN, &ramEN, &dbgEN, &cdrEN);
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// If RAM disk enabled, try to allocate RAM disk buffer if not already
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if (ramEN & !c->ramdisk) {
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if (*MMU32bit) { // 32-bit mode
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unsigned long minBufPtr, newBufPtr;
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// Compute if there is enough high memory
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minBufPtr = ((unsigned long)*MemTop / 2) + 1024;
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newBufPtr = (unsigned long)*BufPtr - RDiskSize;
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if (newBufPtr > minBufPtr && (unsigned long)*BufPtr > newBufPtr) {
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// Allocate RAM disk buffer by lowering BufPtr
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*BufPtr = (Ptr)newBufPtr;
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// Set RAM disk buffer pointer.
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c->ramdisk = *BufPtr;
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// Copy ROM disk image to RAM disk
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BlockMove(RDiskBuf, c->ramdisk, RDiskSize);
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// Clearing write protect marks RAM disk enabled
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c->status.writeProt = 0;
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}
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} else { // 24-bit mode
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// Put RAM disk just past 8MB
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c->ramdisk = (Ptr)(8 * 1024 * 1024);
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// Copy ROM disk image to RAM disk
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//FIXME: what if we don't have enough RAM?
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// Will this wrap around and overwrite low memory?
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// That's not the worst, since the system would just crash,
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// but it would be better to switch to read-only status
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copy24(RDiskBuf, c->ramdisk, RDiskSize);
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// Clearing write protect marks RAM disk enabled
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c->status.writeProt = 0;
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}
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}
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// Get debug and CD-ROM disable settings from ROM table
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c->dbgDisPos = *(long*)0x40851D98;
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c->cdrDisPos = *(long*)0x40851D9C;
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c->dbgDisByte = *(char*)0x40851DA8;
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c->cdrDisByte = *(char*)0x40851DA9;
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// Patch
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if (c->dbgDisPos < RDiskSize) {
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if (c->ramdisk && !dbgEN) {
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poke24(c->ramdisk + c->dbgDisPos, c->dbgDisByte);
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} else if (dbgEN) {
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peek24(RDiskBuf + c->dbgDisPos, c->dbgDisByte);
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}
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}
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if (c->cdrDisPos < RDiskSize) {
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if (c->ramdisk && !cdrEN) {
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poke24(c->ramdisk + c->cdrDisPos, c->cdrDisByte);
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} else if (cdrEN) {
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peek24(RDiskBuf + c->cdrDisPos, c->cdrDisByte);
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}
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}
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// Unmount if not booting from ROM disk
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if (unmountEN) { c->status.diskInPlace = 0; }
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// If mount enabled, enable accRun to post disk inserted event later
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if (mountEN) {
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d->dCtlDelay = 150; // Set accRun delay (150 ticks is 2.5 sec.)
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d->dCtlFlags |= dNeedTimeMask; // Enable accRun
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}
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}
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#pragma parameter __D0 RDPrime(__A0, __A1)
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OSErr RDPrime(IOParamPtr p, DCtlPtr d) {
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RDiskStorage_t *c;
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char cmd;
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Ptr disk;
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// Return disk offline error if dCtlStorage null
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if (!d->dCtlStorage) { return notOpenErr; }
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// Dereference dCtlStorage to get pointer to our context
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c = *(RDiskStorage_t**)d->dCtlStorage;
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// Initialize if this is the first prime call
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if (!c->initialized) { RDInit(p, d, c); }
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// Return disk offline error if virtual disk not inserted
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if (!c->status.diskInPlace) { return offLinErr; }
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// Get pointer to RAM or ROM disk buffer
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disk = (c->ramdisk ? c->ramdisk : RDiskBuf) + d->dCtlPosition;
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// Bounds checking
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if (d->dCtlPosition >= RDiskSize || p->ioReqCount >= RDiskSize ||
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d->dCtlPosition + p->ioReqCount >= RDiskSize) { return paramErr; }
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// Service read or write request
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cmd = p->ioTrap & 0x00FF;
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if (cmd == aRdCmd) { // Read
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// Read from disk into buffer.
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if (*MMU32bit) { BlockMove(disk, p->ioBuffer, p->ioReqCount); }
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else { copy24(disk, StripAddress(p->ioBuffer), p->ioReqCount); }
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if (!c->ramdisk && c->dbgDisPos >= d->dCtlPosition &&
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c->dbgDisPos < d->dCtlPosition + p->ioReqCount) {
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p->ioBuffer[c->dbgDisPos - d->dCtlPosition] = c->dbgDisByte;
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}
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if (!c->ramdisk && c->cdrDisPos >= d->dCtlPosition &&
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c->cdrDisPos < d->dCtlPosition + p->ioReqCount) {
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p->ioBuffer[c->cdrDisPos - d->dCtlPosition] = c->cdrDisByte;
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}
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} else if (cmd == aWrCmd) { // Write
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// Fail if write protected or RAM disk buffer not set up
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if (c->status.writeProt || !c->ramdisk) { return wPrErr; }
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// Write from buffer into disk.
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if (*MMU32bit) { BlockMove(p->ioBuffer, disk, p->ioReqCount); }
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else { copy24(StripAddress(p->ioBuffer), disk, p->ioReqCount); }
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} else { return noErr; } //FIXME: Fail if cmd isn't read or write?
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// Update count and position/offset, then return
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d->dCtlPosition += p->ioReqCount;
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p->ioActCount = p->ioReqCount;
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return noErr;
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}
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#pragma parameter __D0 RDCtl(__A0, __A1)
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OSErr RDCtl(CntrlParamPtr p, DCtlPtr d) {
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RDiskStorage_t *c;
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// Fail if dCtlStorage null
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if (!d->dCtlStorage) { return notOpenErr; }
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// Dereference dCtlStorage to get pointer to our context
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c = *(RDiskStorage_t**)d->dCtlStorage;
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// Handle control request based on csCode
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switch (p->csCode) {
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case killCode:
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return noErr;
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case kFormat:
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if (!c->status.diskInPlace || c->status.writeProt ||
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!c->ramdisk) { return controlErr; }
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long long z = 0;
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Ptr pz;
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if (*MMU32bit) { pz = (Ptr)&z; }
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else { pz = StripAddress((Ptr)&z); }
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for (int i = 0; i < 4095; i++) {
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copy24(c->ramdisk + i * sizeof(z), pz, sizeof(z));
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}
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return noErr;
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case kVerify:
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if (!c->status.diskInPlace) { return controlErr; }
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return noErr;
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case kEject:
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// "Reinsert" disk if ejected illegally
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if (c->status.diskInPlace) {
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PostEvent(diskEvt, c->status.dQDrive);
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}
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return controlErr; // Eject not allowed so return error
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case accRun:
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d->dCtlFlags &= ~dNeedTimeMask; // Disable accRun
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c->status.diskInPlace = 8; // 8 is nonejectable disk
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PostEvent(diskEvt, c->status.dQDrive); // Post disk inserted event
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return noErr;
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case kDriveIcon: case kMediaIcon: // Get icon
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#ifdef RDISK_COMPRESS_ICON_ENABLE
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*(Ptr*)p->csParam = (Ptr)c->icon;
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#else
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*(Ptr*)p->csParam = (Ptr)RDiskIcon;
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#endif
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return noErr;
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case kDriveInfo:
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// high word (bytes 2 & 3) clear
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// byte 1 = primary + fixed media + internal
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// byte 0 = drive type (0x10 is RAM disk) / (0x11 is ROM disk)
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if (c->status.writeProt) { *(long*)p->csParam = 0x00000411; }
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else { *(long*)p->csParam = 0x00000410; }
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return noErr;
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case 24: // Return SCSI partition size
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*(long*)p->csParam = RDiskSize / 512;
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return noErr;
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case 2351: // Post-boot
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c->initialized = 1; // Skip initialization
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d->dCtlDelay = 30; // Set accRun delay (30 ticks is 0.5 sec.)
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d->dCtlFlags |= dNeedTimeMask; // Enable accRun
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return noErr;
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default: return controlErr;
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}
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}
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#pragma parameter __D0 RDStat(__A0, __A1)
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OSErr RDStat(CntrlParamPtr p, DCtlPtr d) {
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//RDiskStorage_t *c;
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// Fail if dCtlStorage null
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if (!d->dCtlStorage) { return notOpenErr; }
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// Dereference dCtlStorage to get pointer to our context
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//c = *(RDiskStorage_t**)d->dCtlStorage;
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// Handle status request based on csCode
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switch (p->csCode) {
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case kDriveStatus:
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BlockMove(*d->dCtlStorage, &p->csParam, sizeof(DrvSts2));
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return noErr;
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default: return statusErr;
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}
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}
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#pragma parameter __D0 RDClose(__A0, __A1)
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OSErr RDClose(IOParamPtr p, DCtlPtr d) {
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// If dCtlStorage not null, dispose of it
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if (!d->dCtlStorage) { return noErr; }
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//RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
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HUnlock(d->dCtlStorage);
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DisposeHandle(d->dCtlStorage);
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d->dCtlStorage = NULL;
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return noErr;
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}
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