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r31900 Thursday 4th September, 2014 at 05:18:05 UTC by Fabio Priuli
(MESS) md_slot.c: let's try to load carts in a rom region rather than in a dynamic buffer. This hopefully allows to search for ROM cheats again and fixes bug MT5488. nw.

[src/emu/bus/megadrive]

md_slot.c md_slot.h rom.c

trunk/src/emu/bus/megadrive/rom.c

r31899	r31900
549	549	READ16_MEMBER(md_rom_mcpirate_device::read)
550	550	{
551	551	if (offset < 0x400000/2)
552		return m_rom[(((m_bank * 0x10000) + (offset << 1)) & (m_rom.bytes() - 1))/2];
	552	return m_rom[(((m_bank * 0x10000) + (offset << 1)) & (m_rom_size - 1))/2];
553	553	else
554	554	return read(space, offset - 0x400000/2, 0xffff);
555	555	}
r31899	r31900
795	795	LION KING 3
796	796	-------------------------------------------------*/
797	797
798		#define MD_LION3_ADDR(a)  (((offset << 1) | (m_bank << 15)) & (m_rom.bytes() - 1))/2
	798	#define MD_LION3_ADDR(a)  (((offset << 1) | (m_bank << 15)) & (m_rom_size - 1))/2
799	799
800	800	READ16_MEMBER(md_rom_lion3_device::read)
801	801	{
r31899	r31900
926	926	POKEMON STADIUM / KAIJU
927	927	-------------------------------------------------*/
928	928
929		#define MD_POKESTAD_ADDR(a)  (((offset << 1) | (m_bank << 15)) & (m_rom.bytes() - 1))/2
	929	#define MD_POKESTAD_ADDR(a)  (((offset << 1) | (m_bank << 15)) & (m_rom_size - 1))/2
930	930
931	931	READ16_MEMBER(md_rom_pokestad_device::read)
932	932	{
r31899	r31900
1308	1308
1309	1309	READ16_MEMBER(md_rom_radica_device::read)
1310	1310	{
1311		return m_rom[(((m_bank * 0x10000) + (offset << 1)) & (m_rom.bytes() - 1))/2];
	1311	return m_rom[(((m_bank * 0x10000) + (offset << 1)) & (m_rom_size - 1))/2];
1312	1312	}
1313	1313
1314	1314	READ16_MEMBER(md_rom_radica_device::read_a13)

trunk/src/emu/bus/megadrive/md_slot.c

r31899	r31900
62	62	//-------------------------------------------------
63	63
64	64	device_md_cart_interface::device_md_cart_interface(const machine_config &mconfig, device_t &device)
65		: device_slot_card_interface(mconfig, device)
	65	: device_slot_card_interface(mconfig, device),
	66	m_rom(NULL),
	67	m_rom_size(0)
66	68	{
67	69	}
68	70
r31899	r31900
79	81	//  rom_alloc - alloc the space for the cart
80	82	//-------------------------------------------------
81	83
82		void device_md_cart_interface::rom_alloc(size_t size)
	84	void device_md_cart_interface::rom_alloc(size_t size, const char *tag)
83	85	{
84	86	if (m_rom == NULL)
85		m_rom.resize(size/sizeof(UINT16));
	87	{
	88	astring tempstring(tag);
	89	m_rom = (UINT16 *)device().machine().memory().region_alloc(tempstring, size, 2, ENDIANNESS_LITTLE)->base();
	90	m_rom_size = size;
	91	}
86	92	}
87	93
88	94
r31899	r31900
367	373	// if cart size is not (2^n * 64K), the system will see anyway that size so we need to alloc a bit more space
368	374	length = m_cart->get_padded_size(length);
369	375
370		m_cart->rom_alloc(length);
	376	astring cart_string(tag());
	377	cart_string.cat(":cart:rom");
	378	m_cart->rom_alloc(length, cart_string.cstr());
371	379	ROM = m_cart->get_rom_base();
372		memcpy(ROM, get_software_region("rom"), get_software_region_length("rom"));
	380	memcpy((UINT8 *)ROM, get_software_region("rom"), get_software_region_length("rom"));
373	381
374	382	// if we allocated a ROM larger that the file (e.g. due to uneven cart size), set remaining space to 0xff
375	383	if (length > get_software_region_length("rom"))
r31899	r31900
479	487	// if cart size is not (2^n * 64K), the system will see anyway that size so we need to alloc a bit more space
480	488	len = m_cart->get_padded_size(tmplen - offset);
481	489	// this contains an hack for SSF2: its current bankswitch code needs larger rom space to work
482		m_cart->rom_alloc((len == 0x500000) ? 0x900000 : len);
	490	astring cart_string(tag());
	491	cart_string.cat(":cart:rom");
	492	m_cart->rom_alloc((len == 0x500000) ? 0x900000 : len, cart_string.cstr());
483	493
484	494
485	495	// STEP 3: copy the game data in the appropriate way
r31899	r31900
602	612	m_cart->m_nvram_end += 1;
603	613
604	614	m_cart->nvram_alloc(m_cart->m_nvram_end - m_cart->m_nvram_start + 1);
605		if (m_cart->m_rom.bytes() <= m_cart->m_nvram_start)
	615	if (m_cart->m_rom_size <= m_cart->m_nvram_start)
606	616	m_cart->m_nvram_active = 1;
607	617	m_cart->m_nvram_handlers_installed = 1;
608	618	// don't trust too much header?
r31899	r31900
615	625	logerror("No SRAM detected from header, using fallback SRAM in case this is a broken header\n");
616	626
617	627	m_cart->nvram_alloc(m_cart->m_nvram_end - m_cart->m_nvram_start + 1);
618		if (m_cart->m_rom.bytes() <= m_cart->m_nvram_start)
	628	if (m_cart->m_rom_size <= m_cart->m_nvram_start)
619	629	m_cart->m_nvram_active = 1;
620	630	break;
621	631
r31899	r31900
624	634	m_cart->m_nvram_start = 0x200000;
625	635	m_cart->m_nvram_end = m_cart->m_nvram_start + get_software_region_length("sram") - 1;
626	636	m_cart->nvram_alloc(m_cart->m_nvram_end - m_cart->m_nvram_start + 1);
627		if (m_cart->m_rom.bytes() <= m_cart->m_nvram_start)
	637	if (m_cart->m_rom_size <= m_cart->m_nvram_start)
628	638	m_cart->m_nvram_active = 1;
629	639	m_cart->m_nvram_handlers_installed = 1;
630	640	break;
r31899	r31900
989	999	astring ctrl(""), reg("");
990	1000
991	1001	// LOG FILE DETAILS
992		logerror("FILE DETAILS\n" );
993		logerror("============\n" );
	1002	logerror("FILE DETAILS\n");
	1003	logerror("============\n");
994	1004	logerror("Name: %s\n", basename());
995	1005	logerror("File Size: 0x%" I64FMT "x\n", (software_entry() == NULL) ? length() : get_software_region_length("rom"));
996	1006	logerror("Detected type: %s\n", md_get_slot(m_type));
r31899	r31900
1062	1072	csum &= 0xffff;
1063	1073	}
1064	1074
1065		logerror("INTERNAL HEADER\n" );
1066		logerror("===============\n" );
	1075	logerror("INTERNAL HEADER\n");
	1076	logerror("===============\n");
1067	1077	logerror("Console: %.16s\n", console);
1068	1078	logerror("Copyright String: %.16s\n", copyright);
1069	1079	logerror(" - Manufacturer: %.4s\n", copyright + 3); // TODO: convert code to manufacturer name!

trunk/src/emu/bus/megadrive/md_slot.h

r31899	r31900
107	107	/* this probably should do more, like make Genesis V2 'die' if the SEGA string is not written promptly */
108	108	virtual DECLARE_WRITE16_MEMBER(write_tmss_bank) { logerror("Write to TMSS bank: offset %x data %x\n", 0xa14000 + (offset << 1), data); };
109	109
110		virtual void rom_alloc(size_t size);
	110	virtual void rom_alloc(size_t size, const char *tag);
111	111	virtual void nvram_alloc(size_t size);
112	112	virtual UINT16* get_rom_base() { return m_rom; };
113	113	virtual UINT16* get_nvram_base() { return m_nvram; };
114		virtual UINT32 get_rom_size() { return m_rom.bytes(); };
	114	virtual UINT32 get_rom_size() { return m_rom_size; };
115	115	virtual UINT32 get_nvram_size() { return m_nvram.bytes(); };
116	116	virtual void set_bank_to_rom(const char *banktag, UINT32 offset) {};
117	117
r31899	r31900
127	127	int m_nvram_handlers_installed;
128	128
129	129	// internal state
130		dynamic_array<UINT16> m_rom;
	130	UINT16  *m_rom;
	131	UINT32  m_rom_size;
131	132	dynamic_array<UINT16> m_nvram;
132	133
133	134	UINT8 rom_bank_map[128];    // 64K chunks of rom

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