Enable Apple DR emulator from NewWorld ROMs only.

SheepShaver/src/BeOS/main_beos.cpp

@@ -117,6 +117,7 @@ const char KERNEL_AREA2_NAME[] = "Macintosh Kernel Data 2";
 const char RAM_AREA_NAME[] = "Macintosh RAM";
 const char ROM_AREA_NAME[] = "Macintosh ROM";
 const char DR_CACHE_AREA_NAME[] = "Macintosh DR Cache";
+const char DR_EMULATOR_AREA_NAME[] = "Macintosh DR Emulator";
 const char SHEEP_AREA_NAME[] = "SheepShaver Virtual Stack";
 
 const uint32 SIG_STACK_SIZE = 8192;			// Size of signal stack
@@ -142,7 +143,7 @@ public:
 		// Initialize other variables
 		sheep_fd = -1;
 		emulator_data = NULL;
-		kernel_area = kernel_area2 = rom_area = ram_area = dr_cache_area = -1;
+		kernel_area = kernel_area2 = rom_area = ram_area = dr_cache_area = dr_emulator_area = -1;
 		emul_thread = nvram_thread = tick_thread = -1;
 		ReadyForSignals = false;
 		AllowQuitting = true;
@@ -190,6 +191,7 @@ private:
 	area_id rom_area;		// ROM area ID
 	area_id ram_area;		// RAM area ID
 	area_id dr_cache_area;	// DR Cache area ID
+	area_id dr_emulator_area;	// DR Emulator area ID
 
 	struct sigaction sigusr1_action;	// Interrupt signal (of emulator thread)
 	struct sigaction sigsegv_action;	// Data access exception signal (of emulator thread)
@@ -213,6 +215,7 @@ uint32 RAMSize;			// Size of Mac RAM
 uint32 KernelDataAddr;	// Address of Kernel Data
 uint32 BootGlobsAddr;	// Address of BootGlobs structure at top of Mac RAM
 uint32 DRCacheAddr;		// Address of DR Cache
+uint32 DREmulatorAddr;	// Address of DR Emulator
 uint32 PVR;				// Theoretical PVR
 int64 CPUClockSpeed;	// Processor clock speed (Hz)
 int64 BusClockSpeed;	// Bus clock speed (Hz)
@@ -313,6 +316,9 @@ void SheepShaver::ReadyToRun(void)
 	area_id old_dr_cache_area = find_area(DR_CACHE_AREA_NAME);
 	if (old_dr_cache_area > 0)
 		delete_area(old_dr_cache_area);
+	area_id old_dr_emulator_area = find_area(DR_EMULATOR_AREA_NAME);
+	if (old_dr_emulator_area > 0)
+		delete_area(old_dr_emulator_area);
 
 	// Read preferences
 	int argc = 0;
@@ -403,7 +409,7 @@ void SheepShaver::StartEmulator(void)
 
 	// Create area for SheepShaver data
 	if (!SheepMem::Init()) {
-		sprintf(str, GetString(STR_NO_SHEEP_MEM_AREA_ERR));
+		sprintf(str, GetString(STR_NO_SHEEP_MEM_AREA_ERR), strerror(SheepMemArea), SheepMemArea);
 		ErrorAlert(str);
 		PostMessage(B_QUIT_REQUESTED);
 		return;
@@ -458,6 +464,17 @@ void SheepShaver::StartEmulator(void)
 	}
 	D(bug("DR Cache area %ld at %p\n", dr_cache_area, DRCacheAddr));
 
+	// Create area for DR Emulator
+	DREmulatorAddr = DR_EMULATOR_BASE;
+	dr_emulator_area = create_area(DR_EMULATOR_AREA_NAME, (void **)&DREmulatorAddr, B_EXACT_ADDRESS, DR_EMULATOR_SIZE, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);
+	if (dr_emulator_area < 0) {
+		sprintf(str, GetString(STR_NO_KERNEL_DATA_ERR), strerror(dr_emulator_area), dr_emulator_area);
+		ErrorAlert(str);
+		PostMessage(B_QUIT_REQUESTED);
+		return;
+	}
+	D(bug("DR Emulator area %ld at %p\n", dr_emulator_area, DREmulatorAddr));
+
 	// Load NVRAM
 	XPRAMInit();
 
@@ -683,6 +700,10 @@ void SheepShaver::Quit(void)
 	// Delete SheepShaver globals
 	SheepMem::Exit();
 
+	// Delete DR Emulator area
+	if (dr_emulator_area >= 0)
+		delete_area(dr_emulator_area);
+
 	// Delete DR Cache area
 	if (dr_cache_area >= 0)
 		delete_area(dr_cache_area);

SheepShaver/src/BeOS/user_strings_beos.cpp

@@ -40,6 +40,9 @@ user_string_def platform_strings[] = {
 	{STR_NET_CONFIG_MODIFY_WARN, "To enable Ethernet networking for SheepShaver, your network configuration has to be modified and the network restarted. Do you want this to be done now (selecting \"Cancel\" will disable Ethernet under SheepShaver)?."},
 	{STR_NET_ADDON_INIT_FAILED, "SheepShaver net server add-on found\nbut there seems to be no network hardware.\nPlease check your network preferences."},
 	{STR_NET_ADDON_CLONE_FAILED, "Cloning of the network transfer area failed."},
+	{STR_NO_SHEEP_MEM_AREA_ERR, "Cannot create SheepShaver Globals area: %s (%08x)."},
+	{STR_NO_DR_CACHE_AREA_ERR, "Cannot create DR Cache area: %s (%08x)."},
+	{STR_NO_DR_EMULATOR_AREA_ERR, "Cannot create DR Emulator area: %s (%08x)."},
 
 	{-1, NULL}	// End marker
 };

SheepShaver/src/BeOS/user_strings_beos.h

@@ -29,7 +29,9 @@ enum {
 	STR_NET_CONFIG_MODIFY_WARN,
 	STR_NET_ADDON_INIT_FAILED,
 	STR_NET_ADDON_CLONE_FAILED,
-	STR_NO_SHEEP_MEM_AREA_ERR
+	STR_NO_SHEEP_MEM_AREA_ERR,
+	STR_NO_DR_CACHE_AREA_ERR,
+	STR_NO_DR_EMULATOR_AREA_ERR
 };
 
 #endif

SheepShaver/src/Unix/main_unix.cpp

@@ -265,6 +265,7 @@ uint32 RAMBase;			// Base address of Mac RAM
 uint32 RAMSize;			// Size of Mac RAM
 uint32 KernelDataAddr;	// Address of Kernel Data
 uint32 BootGlobsAddr;	// Address of BootGlobs structure at top of Mac RAM
+uint32 DRCacheAddr;		// Address of DR Cache
 uint32 PVR;				// Theoretical PVR
 int64 CPUClockSpeed;	// Processor clock speed (Hz)
 int64 BusClockSpeed;	// Bus clock speed (Hz)
@@ -282,6 +283,8 @@ static bool lm_area_mapped = false;			// Flag: Low Memory area mmap()ped
 static int kernel_area = -1;				// SHM ID of Kernel Data area
 static bool rom_area_mapped = false;		// Flag: Mac ROM mmap()ped
 static bool ram_area_mapped = false;		// Flag: Mac RAM mmap()ped
+static bool dr_cache_area_mapped = false;	// Flag: Mac DR Cache mmap()ped
+static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
 static KernelData *kernel_data;				// Pointer to Kernel Data
 static EmulatorData *emulator_data;
 
@@ -597,6 +600,22 @@ int main(int argc, char **argv)
 	KernelDataAddr = KERNEL_DATA_BASE;
 	D(bug("Kernel Data at %p, Emulator Data at %p\n", kernel_data, emulator_data));
 
+	// Create area for DR Cache
+	if (vm_acquire_fixed((void *)DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
+		sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
+		ErrorAlert(str);
+		goto quit;
+	}
+	dr_emulator_area_mapped = true;
+	if (vm_acquire_fixed((void *)DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
+		sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
+		ErrorAlert(str);
+		goto quit;
+	}
+	dr_cache_area_mapped = true;
+	DRCacheAddr = DR_CACHE_BASE;
+	D(bug("DR Cache at %p\n", DRCacheAddr));
+
 	// Create area for SheepShaver data
 	if (!SheepMem::Init()) {
 		sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
@@ -1023,6 +1042,12 @@ static void Quit(void)
 	if (rom_area_mapped)
 		vm_release((char *)ROM_BASE, ROM_AREA_SIZE);
 
+	// Delete DR cache areas
+	if (dr_emulator_area_mapped)
+		vm_release((void *)DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
+	if (dr_cache_area_mapped)
+		vm_release((void *)DR_CACHE_BASE, DR_CACHE_SIZE);
+
 	// Delete Kernel Data area
 	if (kernel_area >= 0) {
 		shmdt((void *)KERNEL_DATA_BASE);

SheepShaver/src/Unix/user_strings_unix.cpp

@@ -38,6 +38,8 @@ user_string_def platform_strings[] = {
 	{STR_KD2_SHMAT_ERR, "Cannot map second Kernel Data area: %s."},
 	{STR_ROM_MMAP_ERR, "Cannot map ROM: %s."},
 	{STR_RAM_MMAP_ERR, "Cannot map RAM: %s."},
+	{STR_DR_CACHE_MMAP_ERR, "Cannot map DR Cache: %s."},
+	{STR_DR_EMULATOR_MMAP_ERR, "Cannot map DR Emulator: %s."},
 	{STR_SHEEP_MEM_MMAP_ERR, "Cannot map SheepShaver Data area: %s."},
 	{STR_SIGALTSTACK_ERR, "Cannot install alternate signal stack (%s). It seems that you need a newer kernel."},
 	{STR_SIGSEGV_INSTALL_ERR, "Cannot install SIGSEGV handler: %s."},

SheepShaver/src/Unix/user_strings_unix.h

@@ -29,6 +29,8 @@ enum {
 	STR_KD2_SHMAT_ERR,
 	STR_ROM_MMAP_ERR,
 	STR_RAM_MMAP_ERR,
+	STR_DR_CACHE_MMAP_ERR,
+	STR_DR_EMULATOR_MMAP_ERR,
 	STR_SHEEP_MEM_MMAP_ERR,
 	STR_SIGALTSTACK_ERR,
 	STR_SIGSEGV_INSTALL_ERR,

SheepShaver/src/emul_op.cpp

@@ -287,15 +287,18 @@ void EmulOp(M68kRegisters *r, uint32 pc, int selector)
 			TimerReset();
 			MacOSUtilReset();
 			AudioReset();
-#if 0
+
-			printf("DR activated\n");
+			// Enable DR emulator from NewWorld ROMs
-			WriteMacInt32(KernelDataAddr + 0x17a0, 3);		// Prepare for DR emulator activation
+			if (ROMType == ROMTYPE_NEWWORLD) {
-			WriteMacInt32(KernelDataAddr + 0x17c0, DR_CACHE_BASE);
+				D(bug("DR activated\n"));
-			WriteMacInt32(KernelDataAddr + 0x17c4, DR_CACHE_SIZE);
+				WriteMacInt32(KernelDataAddr + 0x17a0, 3);		// Prepare for DR emulator activation
-			WriteMacInt32(KernelDataAddr + 0x1b00, DR_CACHE_BASE + 0x10000);
+				WriteMacInt32(KernelDataAddr + 0x17c0, DR_CACHE_BASE);
-			memcpy((void *)(DR_CACHE_BASE + 0x10000), (void *)(ROM_BASE + 0x370000), 0x10000);
+				WriteMacInt32(KernelDataAddr + 0x17c4, DR_CACHE_SIZE);
-			clear_caches((void *)(DR_CACHE_BASE + 0x10000), 0x10000, B_INVALIDATE_ICACHE | B_FLUSH_DCACHE);
+				WriteMacInt32(KernelDataAddr + 0x1b04, DR_CACHE_BASE);
-#endif
+				WriteMacInt32(KernelDataAddr + 0x1b00, DR_EMULATOR_BASE);
+				memcpy((void *)DR_EMULATOR_BASE, (void *)(ROM_BASE + 0x370000), DR_EMULATOR_SIZE);
+				MakeExecutable(0, (void *)DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
+			}
 			break;
 
 		case OP_IRQ:			// Level 1 interrupt

SheepShaver/src/include/cpu_emulation.h

@@ -31,6 +31,8 @@ const uintptr ROM_BASE = 0x40800000;			// Base address of ROM
 const uint32  ROM_SIZE = 0x400000;				// Size of ROM file
 const uint32  ROM_AREA_SIZE = 0x500000;			// Size of ROM area
 const uintptr ROM_END = ROM_BASE + ROM_SIZE;	// End of ROM
+const uintptr DR_EMULATOR_BASE = 0x68070000;	// Address of DR emulator code
+const uint32  DR_EMULATOR_SIZE = 0x10000;		// Size of DR emulator code
 const uintptr DR_CACHE_BASE = 0x69000000;		// Address of DR cache
 const uint32  DR_CACHE_SIZE = 0x80000;			// Size of DR Cache
 

SheepShaver/src/rom_patches.cpp

@@ -1058,7 +1058,7 @@ static bool patch_nanokernel_boot(void)
 static bool patch_68k_emul(void)
 {
 	uint32 *lp;
-	uint32 base;
+	uint32 base, loc;
 
 	// Overwrite twi instructions
 	static const uint8 twi_dat[] = {0x0f, 0xff, 0x00, 0x00, 0x0f, 0xff, 0x00, 0x01, 0x0f, 0xff, 0x00, 0x02};
@@ -1266,12 +1266,21 @@ static bool patch_68k_emul(void)
 	return false;
 dr_found:
 	lp++;
-	*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff));		// b	DR_CACHE_BASE+0x1f000
+	loc = (uint32)lp - ROM_BASE;
-	lp = (uint32 *)(ROM_BASE + 0x37f000);
+	if ((base = powerpc_branch_target(ROM_BASE + loc)) == 0) base = ROM_BASE + loc;
-	*lp++ = htonl(0x3c000000 + ((ROM_BASE + 0x46d0a4) >> 16));		// lis	r0,xxx
+	static const uint8 dr_ret_dat[] = {0x80, 0xbf, 0x08, 0x14, 0x53, 0x19, 0x4d, 0xac, 0x7c, 0xa8, 0x03, 0xa6};
-	*lp++ = htonl(0x60000000 + ((ROM_BASE + 0x46d0a4) & 0xffff));	// ori	r0,r0,xxx
+	if ((base = find_rom_data(base - ROM_BASE, 0x380000, dr_ret_dat, sizeof(dr_ret_dat))) == 0) return false;
-	*lp++ = htonl(0x7c0903a6);										// mtctr	r0
+	D(bug("dr_ret %08lx\n", base));
-	*lp = htonl(POWERPC_BCTR);										// bctr
+	if (base != loc) {
+		// OldWorld ROMs contain an absolute branch
+		D(bug(" patching absolute branch at %08x\n", (uint32)lp - ROM_BASE));
+		*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff));		// b	DR_CACHE_BASE+0x1f000
+		lp = (uint32 *)(ROM_BASE + 0x37f000);
+		*lp++ = htonl(0x3c000000 + ((ROM_BASE + base) >> 16));			// lis	r0,xxx
+		*lp++ = htonl(0x60000000 + ((ROM_BASE + base) & 0xffff));		// ori	r0,r0,xxx
+		*lp++ = htonl(0x7c0803a6);										// mtlr	r0
+		*lp = htonl(POWERPC_BLR);										// blr
+	}
 	return true;
 }