mirror of
https://github.com/garrettsworkshop/MacIIROMDiskDriver.git
synced 2024-06-12 22:29:27 +00:00
400 lines
13 KiB
C
400 lines
13 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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const char RDiskIcon[285] = {
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// Icon
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b10000000, 0b00000000, 0b00000000, 0b00000001,
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0b10001111, 0b00011110, 0b00111100, 0b01111001,
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0b10001001, 0b00010010, 0b00100100, 0b01001001,
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0b10001001, 0b00010010, 0b00100100, 0b01001001,
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0b10001001, 0b00010010, 0b00100100, 0b01001001,
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0b10001111, 0b00011110, 0b00111100, 0b01111001,
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0b11000000, 0b00000000, 0b00000000, 0b00000001,
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0b01010101, 0b01010101, 0b11010101, 0b01010101,
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0b01111111, 0b11111111, 0b01111111, 0b11111111,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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// Mask
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b11111111, 0b11111111, 0b11111111, 0b11111111,
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0b01111111, 0b11111111, 0b11111111, 0b11111111,
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0b01111111, 0b11111111, 0b11111111, 0b11111111,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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0b00000000, 0b00000000, 0b00000000, 0b00000000,
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27, 'G', 'a', 'r', 'r', 'e', 't', 't', '\'', 's', ' ',
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'W', 'o', 'r', 'k', 's', 'h', 'o', 'p', ' ',
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'R', 'O', 'M', ' ', 'D', 'i', 's', 'k', 0
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};
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static void RDiskDecodeSettings(RDiskStorage_t *c, char *enable, char* boot, char* mount, char* ram) {
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char rKey, aKey, legacy_startup, legacy_ram;
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// Read PRAM and keys
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RDiskReadXPRAM(1, 4, &legacy_startup);
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RDiskReadXPRAM(1, 5, &legacy_ram);
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rKey = RDiskIsRPressed();
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aKey = RDiskIsAPressed();
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// Decode settings
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if (c->postBoot) {
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*enable = 1;
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*boot = 1; // Boot set so first access works
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*mount = 1;
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*ram = 0;
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} else if (rKey) { // R boots from ROM disk
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*enable = 1;
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*boot = 1;
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*mount = 0;
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*ram = aKey; // A enables RAM disk
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} else if (legacy_startup) {
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*enable = 1;
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*boot = (legacy_startup & 0xFD) && (legacy_startup != 0xFD);
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*mount = !*boot && legacy_startup & 0x02;
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*ram = legacy_ram;
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} else {
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*enable = 0;
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*boot = 0;
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*mount = 0;
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*ram = 0;
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}
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}
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// Switch to 24-bit mode and copy
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void RDiskCopy24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
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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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#pragma parameter __D0 RDiskOpen(__A0, __A1)
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OSErr RDiskOpen(IOParamPtr p, DCtlPtr d) {
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DrvQElPtr dq;
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int drvNum;
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Ptr copy24;
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RDiskStorage_t *c;
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// Do nothing if already opened
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if (d->dCtlStorage) { return noErr; }
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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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}
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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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// Allocate copy function buffer and copy RDiskCopy24 to it
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copy24 = NewPtrSys(64);
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if (!copy24) { DisposeHandle(d->dCtlStorage); return openErr; }
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BlockMove(&RDiskCopy24, copy24, 64);
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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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// Initialize storage struct fields
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//c->initialized = 0;
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//c->removed = 0;
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//c->postBoot = 0;
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//c->ramdisk = NULL;
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c->copy24 = (RDiskCopy_t)copy24;
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// Set drive status
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c->status.writeProt = -1;
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c->status.diskInPlace = 8; // 8 means nonejectable disk
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c->status.dQDrive = drvNum;
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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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// Set driver flags
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/*d->dCtlFlags |= dReadEnableMask | dWritEnableMask |
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dCtlEnableMask | dStatEnableMask |
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dNeedLockMask;*/ // 0x4F
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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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static OSErr RDiskInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
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char rdiskEN, mountEN, bootEN, ramEN;
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// Mark init done
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c->initialized = 1;
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// Decode settings
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RDiskDecodeSettings(c, &rdiskEN, &bootEN, &mountEN, &ramEN);
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// If ROM disk not enabled, remove drive from drive queue
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if (!rdiskEN) {
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QHdrPtr head = GetDrvQHdr();
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DrvQElPtr dq = (DrvQElPtr)head->qHead;
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// Remove our drive from the system drive queue
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// Loop through entire drive queue, searching for our deive
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while ((dq != (DrvQElPtr)(head->qTail)) &&
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(dq->dQRefNum != d->dCtlRefNum)) {
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dq = (DrvQElPtr)(dq->qLink);
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}
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// If we found our drive, remove it from the queue
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if (dq->dQRefNum == d->dCtlRefNum) {
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Dequeue((QElemPtr)dq, head);
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}
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// Mark drive removed and offline
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c->removed = 1;
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c->status.diskInPlace = 0; // 0 means no disk in drive
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return offLinErr;
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}
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// If RAM disk enabled, try to allocate RAM disk buffer
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if (ramEN) {
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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 = (char*)(8 * 1024 * 1024);
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// Copy ROM disk image to RAM disk
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((RDiskCopy_t)StripAddress(c->copy24))(
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RDiskBuf, StripAddress(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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//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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}
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}
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// If boot disabled...
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if (!bootEN) {
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// Set drive offline
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c->status.diskInPlace = 0; // 0 means no disk in drive
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// Enable accRun to post disk inserted event if mount enabled
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if (mountEN) {
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d->dCtlDelay = 150;
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d->dCtlFlags |= dNeedTimeMask;
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}
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return offLinErr;
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}
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return noErr;
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}
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#pragma parameter __D0 RDiskPrime(__A0, __A1)
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OSErr RDiskPrime(IOParamPtr p, DCtlPtr d) {
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RDiskStorage_t *c;
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char cmd;
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char *disk;
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long offset;
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// Return disk offline error if dCtlStorage null
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if (!d->dCtlStorage) { return offLinErr; }
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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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// Return disk offline error if virtual disk not inserted
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if (!c->status.diskInPlace) { return offLinErr; }
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// Initialize if this is the first prime call
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if (!c->initialized) {
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OSErr ret = RDiskInit(p, d, c);
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if (ret != noErr) { return ret; }
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}
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// Get pointer to RAM or ROM disk buffer
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disk = c->ramdisk ? c->ramdisk : RDiskBuf;
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// Add offset to buffer pointer according to positioning mode
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switch (p->ioPosMode & 0x000F) {
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case fsAtMark: offset = d->dCtlPosition; break;
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case fsFromStart: offset = p->ioPosOffset; break;
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case fsFromMark: offset = d->dCtlPosition + p->ioPosOffset; break;
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default: break;
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}
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disk += offset;
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// Bounds checking disabled
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if (offset >= RDiskSize || p->ioReqCount >= RDiskSize ||
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offset + p->ioReqCount >= RDiskSize) { return posErr; }
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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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// Return immediately if verify operation requested
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//FIXME: follow either old (verify) or new (read uncached) convention
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if (p->ioPosMode & rdVerifyMask) {
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return noErr;
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}
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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 {
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((RDiskCopy_t)StripAddress(c->copy24))(
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disk, StripAddress(p->ioBuffer), p->ioReqCount);
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}
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// Update count
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p->ioActCount = p->ioReqCount;
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d->dCtlPosition = offset + p->ioReqCount;
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p->ioPosOffset = d->dCtlPosition;
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return noErr;
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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 {
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((RDiskCopy_t)StripAddress(c->copy24))(
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StripAddress(p->ioBuffer), disk, p->ioReqCount);
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}
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// Update count and position/offset
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p->ioActCount = p->ioReqCount;
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d->dCtlPosition = offset + p->ioReqCount;
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p->ioPosOffset = d->dCtlPosition;
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return noErr;
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} else { return noErr; }
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//FIXME: Should we fail if cmd isn't read or write?
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}
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#pragma parameter __D0 RDiskControl(__A0, __A1)
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OSErr RDiskControl(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 controlErr; }
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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 6: // Format
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if (!c->status.diskInPlace || c->status.writeProt || !c->ramdisk) {
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return controlErr;
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} else {
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char zero[64];
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for (int i = 0; i < sizeof(zero); i++) { zero[i] = 0; }
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for (int i = 0; i < RDiskSize / 64; i++) {
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if (*MMU32bit) { BlockMove(zero, c->ramdisk, sizeof(zero)); }
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else {
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((RDiskCopy_t)StripAddress(c->copy24))(
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StripAddress(zero), c->ramdisk, sizeof(zero));
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}
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}
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}
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return noErr;
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case 5: // Verify (after format)
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if (!c->status.diskInPlace || c->status.writeProt || !c->ramdisk) {
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return controlErr;
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} else { return noErr; }
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case accRun:
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// Disable accRun
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d->dCtlFlags &= ~dNeedTimeMask;
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// If drive present in drive queue, set drive online
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if (!c->removed) {
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c->status.diskInPlace = 8; // 8 means nonejectable disk
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PostEvent(diskEvt, c->status.dQDrive);
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}
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return noErr;
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case 21: case 22: // Get icon
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*(Ptr*)&p->csParam = (Ptr)&RDiskIcon;
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return noErr;
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case 128:
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c->postBoot = 1;
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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 RDiskStatus(__A0, __A1)
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OSErr RDiskStatus(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 statusErr; }
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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 drvStsCode:
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BlockMove(*d->dCtlStorage, &p->csParam, sizeof(DrvSts2));
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return noErr;
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case 128: // Get size
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*((long*)p->csParam) = RDiskSize;
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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 RDiskClose(__A0, __A1)
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OSErr RDiskClose(IOParamPtr p, DCtlPtr d) {
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// If dCtlStorage not null, dispose of it and its contents
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if (!d->dCtlStorage) { return noErr; }
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RDiskStorage_t *c = *(RDiskStorage_t**)d->dCtlStorage;
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if (c->copy24) { DisposePtr((Ptr)c->copy24); }
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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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