Macintosh-HW/MacIIROMDiskDriver
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Fix CD/debug patch bug

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This commit is contained in:
Zane Kaminski 2022-01-08 01:53:49 -05:00
parent 551b0d23e3
commit e6b8367a8e
8 changed files with 23 additions and 28 deletions
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51
rdisk.c
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@ -92,6 +92,21 @@ void __attribute__ ((noinline)) S24(Ptr pos, char patch) {
SwapMMUMode(&mode);
}
static void RDUnpatch(unsigned long pos, Ptr patch) {
char (*peek)(Ptr) = G24;
*patch = peek(RDiskBuf + pos);
}
static void RDPatch(char enable, Ptr patch, Ptr ramdisk, unsigned long pos, char data) {
if (!enable) {
*patch = data;
if (ramdisk) {
void (*poke)(Ptr, char) = S24;
poke(ramdisk + pos, data);
}
}
}
// Figure out the first available drive number >= 5
static int RDFindDrvNum() {
DrvQElPtr dq;
@ -144,9 +159,9 @@ OSErr RDOpen(IOParamPtr p, DCtlPtr d) {
// Find first available drive number
drvNum = RDFindDrvNum();
// Get debug and CD-ROM disable settings from ROM table
c->dbgDisByte = RDiskDBGDisByte;
c->cdrDisByte = RDiskCDRDisByte;
// Enable debugger and CD-ROM
RDUnpatch(RDiskDBGDisPos, &c->dbgDisByte);
RDUnpatch(RDiskCDRDisPos, &c->cdrDisByte);
// Set drive status
//c->status.track = 0;
@ -173,19 +188,6 @@ OSErr RDOpen(IOParamPtr p, DCtlPtr d) {
return noErr;
}
static void RDPatchRAMDisk(char enable, Ptr ram, Ptr rom,
unsigned long pos, unsigned long size, Ptr patch) {
if (pos < size) {
if (enable) {
void (*poke)(Ptr, char) = S24;
poke(ram + pos, *patch);
} else {
char (*peek)(Ptr) = G24;
*patch = peek(rom + pos);
}
}
}
// Init is called at beginning of first prime (read/write) call
static void RDBootInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// Mark init done
@ -216,19 +218,12 @@ static void RDBootInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// but it would be better to switch to read-only status
}
}
// Copy ROM disk image to RAM disk
if (c->ramdisk) { copy24(RDiskBuf, c->ramdisk, RDiskSize); }
if (c->ramdisk) {
// Copy ROM disk image to RAM disk
copy24(RDiskBuf, c->ramdisk, RDiskSize);
// Clearing write protect marks RAM disk enabled
c->status.writeProt = 0;
// Patch debug
RDPatchRAMDisk(!c->dbgEN, c->ramdisk, RDiskBuf,
RDiskDBGDisPos, RDiskSize, &c->dbgDisByte);
// Patch CD
RDPatchRAMDisk(!c->cdrEN, c->ramdisk, RDiskBuf,
RDiskCDRDisPos, RDiskSize, &c->cdrDisByte);
}
// Patch to disable debugger and CD-ROM
RDPatch(c->dbgEN, &c->dbgDisByte, c->ramdisk, RDiskDBGDisPos, RDiskDBGDisByte);
RDPatch(c->cdrEN, &c->cdrDisByte, c->ramdisk, RDiskCDRDisPos, RDiskCDRDisByte);
// Unmount if not booting from ROM disk
if (c->unmountEN) { c->status.diskInPlace = 0; }