Macintosh-HW/MacIIROMDiskDriver
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New strategy for patching ROM disk debug/CD

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This commit is contained in:
Zane Kaminski 2021-04-01 03:46:40 -04:00
parent 3e519016ac
commit 19bf5c98fe
4 changed files with 25 additions and 23 deletions
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bin/driver7M5.bin
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bin/rom8M.bin
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40
rdisk.c
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@ -36,7 +36,7 @@ static void RDDecodeSettings(Ptr unmountEN, Ptr mountEN, Ptr ramEN, Ptr dbgEN, P
}
}
// MacsBug enabled if bit 3 == 1 or DBGDis addr invalid or not boot
// MacsBug enabled if bit 2 == 1 or DBGDis addr invalid or not boot
*dbgEN = *unmountEN ||
(legacy_startup & 0x04) ||
(*RDiskDBGDisPos == 0);
@ -48,14 +48,25 @@ static void RDDecodeSettings(Ptr unmountEN, Ptr mountEN, Ptr ramEN, Ptr dbgEN, P
}
// Switch to 32-bit mode and copy
#pragma parameter RDCopy24(__A0, __A1, __D0)
void RDCopy24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
#pragma parameter C24(__A0, __A1, __D0)
void C24(Ptr sourcePtr, Ptr destPtr, unsigned long byteCount) {
signed char mode = true32b;
SwapMMUMode(&mode);
BlockMove(sourcePtr, destPtr, byteCount);
SwapMMUMode(&mode);
}
// Switch to 32-bit mode and patch
void P24(Ptr ramdisk, char dbgEN, char cdromEN) {
if (!ramdisk) { return; }
signed char mode = true32b;
SwapMMUMode(&mode);
// Patch debug and CD-ROM disable bytes
if (!dbgEN) { ramdisk[*RDiskDBGDisPos] = *RDiskDBGDisByte; }
if (!cdromEN) { ramdisk[*RDiskCDROMDisPos] = *RDiskCDROMDisByte; }
SwapMMUMode(&mode);
}
// Figure out the first available drive number >= 5
static int RDFindDrvNum() {
DrvQElPtr dq;
@ -126,8 +137,6 @@ static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
c->dbgEN = dbgEN;
c->cdromEN = cdromEN;
char dis = 0x44;
// If RAM disk enabled, try to allocate RAM disk buffer if not already
if (ramEN & !c->ramdisk) {
if (*MMU32bit) { // 32-bit mode
@ -144,33 +153,24 @@ static void RDInit(IOParamPtr p, DCtlPtr d, RDiskStorage_t *c) {
BlockMove(RDiskBuf, c->ramdisk, RDiskSize);
// Clearing write protect marks RAM disk enabled
c->status.writeProt = 0;
// Patch debug and CD-ROM enable bytes
BlockMove(&c->ramdisk[*RDiskDBGDisPos], &dis, 1);
BlockMove(&c->ramdisk[*RDiskCDROMDisPos], &dis, 1);
}
} 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
// Patch debug and CD-ROM enable bytes
copy24(&c->ramdisk[*RDiskDBGDisPos], &dis, 1);
copy24(&c->ramdisk[*RDiskCDROMDisPos], &dis, 1);
copy24(RDiskBuf, c->ramdisk, RDiskSize);
// Clearing write protect marks RAM disk enabled
c->status.writeProt = 0;
}
// Patch debug and CD-ROM enable bytes
//if (!c->dbgEN) {
//}
//if (!c->cdromEN) {
//}
}
// Patch debug and CD-ROM enable bytes
patch24(c->ramdisk, dbgEN, cdromEN);
// Unmount if not booting from ROM disk
if (unmountEN) { c->status.diskInPlace = 0; }

8
rdisk.h
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@ -19,9 +19,6 @@ OSErr RDiskAddDrive(short drvrRefNum, short drvNum, DrvQElPtr dq) = {0x4840, 0x3
static inline char RDiskIsRPressed() { return *((char*)0x175) & 0x80; }
static inline char RDiskIsAPressed() { return *((char*)0x174) & 0x01; }
typedef void (*RDiskCopy_t)(Ptr, Ptr, unsigned long);
#define copy24(s, d, b) { RDiskCopy_t copy24 = (RDiskCopy_t)RDCopy24; copy24(s, d, b); }
//#define RDISK_COMPRESS_ICON_ENABLE
#define RDISK_ICON_SIZE (285)
typedef struct RDiskStorage_s {
@ -35,6 +32,11 @@ typedef struct RDiskStorage_s {
#endif
} RDiskStorage_t;
typedef void (*RDiskCopy_t)(Ptr, Ptr, unsigned long);
#define copy24(s, d, b) { RDiskCopy_t copy24 = (RDiskCopy_t)C24; copy24(s, d, b); }
typedef void (*RDiskPatch_t)(Ptr, char, char);
#define patch24(s, d, b) { RDiskPatch_t patch24 = (RDiskPatch_t)P24; patch24(s, d, b); }
#define PackBits_Repeat(count) (-1 * (count - 1))
#define PackBits_Literal(count) (count - 1)