mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
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102 lines
4.5 KiB
C
102 lines
4.5 KiB
C
/****************************************************************************
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* Genesis Plus
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* Mega Drive cartridge hardware support
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*
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* Copyright (C) 2007-2024 Eke-Eke (Genesis Plus GX)
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*
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* Most cartridge protections were initially documented by Haze
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* (http://haze.mameworld.info/)
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*
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* Realtec mapper was documented by TascoDeluxe
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#ifndef _MD_CART_H_
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#define _MD_CART_H_
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#ifdef USE_DYNAMIC_ALLOC
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#define cart ext->md_cart
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#else
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#define cart ext.md_cart
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#endif
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/* Lock-On cartridge type */
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#define TYPE_GG 0x01 /* Game Genie */
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#define TYPE_AR 0x02 /* (Pro) Action Replay */
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#define TYPE_SK 0x03 /* Sonic & Knuckles */
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/* CD hardware add-on (MD mode) */
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#define HW_ADDON_AUTO 0x00
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#define HW_ADDON_MEGACD 0x01
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#define HW_ADDON_MEGASD 0x02
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#define HW_ADDON_NONE 0x03
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/* Special hardware (0x01 & 0x02 reserved for Master System 3-D glasses & Terebi Oekaki) */
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#define HW_J_CART 0x04
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#define HW_LOCK_ON 0x08
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#define HW_MEGASD 0x10
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/* Cartridge extra hardware */
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typedef struct
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{
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uint8 regs[4]; /* internal registers (R/W) */
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uint32 mask[4]; /* registers address mask */
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uint32 addr[4]; /* registers address */
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uint16 realtec; /* realtec mapper */
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uint16 bankshift; /* cartridge with bankshift mecanism reseted on software reset */
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unsigned int (*time_r)(unsigned int address); /* !TIME signal ($a130xx) read handler */
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void (*time_w)(unsigned int address, unsigned int data); /* !TIME signal ($a130xx) write handler */
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unsigned int (*regs_r)(unsigned int address); /* cart hardware registers read handler */
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void (*regs_w)(unsigned int address, unsigned int data); /* cart hardware registers write handler */
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} cart_hw_t;
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/* Cartridge type */
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typedef struct
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{
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uint8 *base; /* ROM base (saved for OS/Cartridge ROM swap) */
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uint32 romsize; /* ROM size */
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uint32 mask; /* ROM mask */
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uint8 special; /* custom external hardware (Lock-On, J-Cart, 3-D glasses, Terebi Oekaki,...) */
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cart_hw_t hw; /* cartridge internal hardware */
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uint8 lockrom[0x10000]; /* Game Genie / (Pro) Action Replay Lock-On ROM area (max 64KB) */
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uint8 rom[MAXROMSIZE]; /* cartridge ROM area */
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} md_cart_t;
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/* Function prototypes */
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extern void md_cart_init(void);
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extern void md_cart_reset(int hard_reset);
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extern int md_cart_context_save(uint8 *state);
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extern int md_cart_context_load(uint8 *state);
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#endif
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