Macintosh-HW
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MacIIROMDiskDriver
mirror of https://github.com/garrettsworkshop/MacIIROMDiskDriver.git
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This commit is contained in:
Zane Kaminski 2021-04-02 04:21:40 -04:00
parent dfd35cef2d
commit e4b2775f11
4 changed files with 40 additions and 16 deletions
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46
rdisk.c
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@ -52,12 +52,30 @@ void C24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
SwapMMUMode(&mode);
}
// Switch to 32-bit mode and patch
#pragma parameter P24(__A2, __D3)
void __attribute__ ((noinline)) P24(Ptr pos, char patch) {
// Switch to 32-bit mode and get
#pragma parameter G24(__A2)
char __attribute__ ((noinline)) G24(Ptr pos) {
signed char mode = true32b;
SwapMMUMode(&mode);
*pos = patch; // Patch byte
return *pos; // Peek
SwapMMUMode(&mode);
}
// Switch to 32-bit mode and get
#pragma parameter G24L(__A2)
long __attribute__ ((noinline)) G24L(long *pos) {
signed char mode = true32b;
SwapMMUMode(&mode);
return *pos; // Peek
SwapMMUMode(&mode);
}
// Switch to 32-bit mode and set
#pragma parameter S24(__A2, __D3)
void __attribute__ ((noinline)) S24(Ptr pos, char patch) {
signed char mode = true32b;
SwapMMUMode(&mode);
*pos = patch; // Poke
SwapMMUMode(&mode);
}
@ -128,10 +146,12 @@ static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// Decode settings
RDDecodeSettings(&unmountEN, &mountEN, &ramEN, &dbgEN, &cdrEN);
// Set debug and CD-ROM disable stuff in storage struct
c->dbgDisPos = dbgEN ? *((long*)0x40851D98) : -1;
c->cdrDisPos = cdrEN ? *((long*)0x40851D9C) : -1;
c->dbgDisByte = *((char*)0x40851DA8);
c->cdrDisByte = *((char*)0x40851DA9);
peek24L((long*)0x40851D98, c->dbgDisPos);
peek24L((long*)0x40851D9C, c->cdrDisPos);
peek24((char*)0x40851DA8, c->dbgDisByte);
peek24((char*)0x40851DA9, c->cdrDisByte);
if (dbgEN) { peek24(RDiskBuf + c->dbgDisPos, c->dbgDisByte); }
if (cdrEN) { peek24(RDiskBuf + c->cdrDisPos, c->cdrDisByte); }
// If RAM disk enabled, try to allocate RAM disk buffer if not already
if (ramEN & !c->ramdisk) {
@ -167,9 +187,9 @@ static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
// Apply patches to RAM disk
if (c->ramdisk) {
// Patch debugger enable byte
if (c->dbgDisPos >=0) { patch24(c->ramdisk + c->dbgDisPos, c->dbgDisByte); }
poke24(c->ramdisk + c->dbgDisPos, c->dbgDisByte);
// Patch CD-R enable byte
if (c->cdrDisPos >=0) { patch24(c->ramdisk + c->dbgDisPos, c->dbgDisByte); }
poke24(c->ramdisk + c->cdrDisPos, c->cdrDisByte);
}
// Unmount if not booting from ROM disk
@ -211,13 +231,11 @@ OSErr RDPrime(IOParamPtr p, DCtlPtr d) {
// Read from disk into buffer.
if (*MMU32bit) { BlockMove(disk, p->ioBuffer, p->ioReqCount); }
else { copy24(disk, StripAddress(p->ioBuffer), p->ioReqCount); }
if (c->dbgDisPos >= 0 &&
c->dbgDisPos >= d->dCtlPosition &&
if (!c->ramdisk && c->dbgDisPos >= d->dCtlPosition &&
c->dbgDisPos < d->dCtlPosition + p->ioReqCount) {
p->ioBuffer[c->dbgDisPos - d->dCtlPosition] = c->dbgDisByte;
}
if (c->dbgDisPos >= 0 &&
c->cdrDisPos >= d->dCtlPosition &&
if (!c->ramdisk && c->cdrDisPos >= d->dCtlPosition &&
c->cdrDisPos < d->dCtlPosition + p->ioReqCount) {
p->ioBuffer[c->cdrDisPos - d->dCtlPosition] = c->cdrDisByte;
}

10
rdisk.h
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@ -35,8 +35,14 @@ typedef struct RDiskStorage_s {
typedef void (*RDiskCopy_t)(Ptr, Ptr, unsigned long);
#define copy24(s, d, b) { RDiskCopy_t f = C24; f(s, d, b); }
typedef void (*RDiskPatch_t)(Ptr, char);
#define patch24(a, d) { RDiskPatch_t f = P24; f(a, d); }
typedef char (*RDiskPeek_t)(Ptr);
#define peek24(a, d) { RDiskPeek_t f = G24; d = f(a); }
typedef long (*RDiskPeekL_t)(long*);
#define peek24L(a, d) { RDiskPeekL_t f = G24L; d = f(a); }
typedef void (*RDiskPoke_t)(Ptr, char);
#define poke24(a, d) { RDiskPoke_t f = S24; f(a, d); }
#define PackBits_Repeat(count) (-1 * (count - 1))
#define PackBits_Literal(count) (count - 1)