284 lines
9.3 KiB
C
284 lines
9.3 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Savestate support
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*
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* Copyright (C) 2007-2021 Eke-Eke (Genesis Plus GX)
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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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#include "shared.h"
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int state_load(unsigned char *state)
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{
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int i, bufferptr = 0;
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/* signature check (GENPLUS-GX x.x.x) */
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char version[17];
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load_param(version,16);
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version[16] = 0;
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if (memcmp(version,STATE_VERSION,11))
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{
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return 0;
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}
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/* version check */
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if ((version[11] < 0x31) || (version[13] < 0x37) || (version[15] < 0x35))
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{
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return 0;
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}
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/* reset system */
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system_reset();
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/* enable VDP access for TMSS systems */
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for (i=0xc0; i<0xe0; i+=8)
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{
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m68k.memory_map[i].read8 = vdp_read_byte;
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m68k.memory_map[i].read16 = vdp_read_word;
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m68k.memory_map[i].write8 = vdp_write_byte;
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m68k.memory_map[i].write16 = vdp_write_word;
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zbank_memory_map[i].read = zbank_read_vdp;
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zbank_memory_map[i].write = zbank_write_vdp;
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}
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/* GENESIS */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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load_param(work_ram, sizeof(work_ram));
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load_param(zram, sizeof(zram));
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load_param(&zstate, sizeof(zstate));
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load_param(&zbank, sizeof(zbank));
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if (zstate == 3)
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{
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m68k.memory_map[0xa0].read8 = z80_read_byte;
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m68k.memory_map[0xa0].read16 = z80_read_word;
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m68k.memory_map[0xa0].write8 = z80_write_byte;
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m68k.memory_map[0xa0].write16 = z80_write_word;
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}
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else
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{
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m68k.memory_map[0xa0].read8 = m68k_read_bus_8;
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m68k.memory_map[0xa0].read16 = m68k_read_bus_16;
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m68k.memory_map[0xa0].write8 = m68k_unused_8_w;
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m68k.memory_map[0xa0].write16 = m68k_unused_16_w;
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}
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}
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else
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{
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load_param(work_ram, 0x2000);
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}
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/* IO */
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load_param(io_reg, sizeof(io_reg));
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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io_reg[0] = region_code | 0x20 | (config.bios & 1);
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}
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else
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{
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io_reg[0] = 0x80 | (region_code >> 1);
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}
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/* VDP */
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bufferptr += vdp_context_load(&state[bufferptr]);
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/* SOUND */
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bufferptr += sound_context_load(&state[bufferptr]);
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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psg_config(0, config.psg_preamp, 0xff);
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}
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else
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{
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psg_config(0, config.psg_preamp, io_reg[6]);
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}
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/* 68000 */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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uint16 tmp16;
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uint32 tmp32;
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
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load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
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load_param(&tmp32, 4); m68k_set_reg(M68K_REG_ISP,tmp32);
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load_param(&m68k.cycles, sizeof(m68k.cycles));
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load_param(&m68k.int_level, sizeof(m68k.int_level));
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load_param(&m68k.stopped, sizeof(m68k.stopped));
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}
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/* Z80 */
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load_param(&Z80, sizeof(Z80_Regs));
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Z80.irq_callback = z80_irq_callback;
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/* Extra HW */
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if (system_hw == SYSTEM_MCD)
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{
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/* handle case of MD cartridge using or not CD hardware */
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char id[5];
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load_param(id,4);
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id[4] = 0;
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/* check if CD hardware was enabled before attempting to restore */
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if (memcmp(id,"SCD!",4))
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{
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return 0;
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}
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/* CD hardware */
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bufferptr += scd_context_load(&state[bufferptr], version);
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}
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else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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/* MD cartridge hardware */
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bufferptr += md_cart_context_load(&state[bufferptr]);
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}
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else
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{
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/* MS cartridge hardware */
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bufferptr += sms_cart_context_load(&state[bufferptr]);
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sms_cart_switch(~io_reg[0x0E]);
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}
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return bufferptr;
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}
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int state_save(unsigned char *state)
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{
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/* buffer size */
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int bufferptr = 0;
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/* version string */
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char version[16];
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memcpy(version,STATE_VERSION,16);
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save_param(version, 16);
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/* GENESIS */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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save_param(work_ram, sizeof(work_ram));
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save_param(zram, sizeof(zram));
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save_param(&zstate, sizeof(zstate));
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save_param(&zbank, sizeof(zbank));
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}
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else
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{
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save_param(work_ram, 0x2000);
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}
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/* IO */
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save_param(io_reg, sizeof(io_reg));
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/* VDP */
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bufferptr += vdp_context_save(&state[bufferptr]);
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/* SOUND */
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bufferptr += sound_context_save(&state[bufferptr]);
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/* 68000 */
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if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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uint16 tmp16;
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uint32 tmp32;
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tmp32 = m68k_get_reg(M68K_REG_D0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_D7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_A7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_PC); save_param(&tmp32, 4);
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tmp16 = m68k_get_reg(M68K_REG_SR); save_param(&tmp16, 2);
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tmp32 = m68k_get_reg(M68K_REG_USP); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(M68K_REG_ISP); save_param(&tmp32, 4);
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save_param(&m68k.cycles, sizeof(m68k.cycles));
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save_param(&m68k.int_level, sizeof(m68k.int_level));
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save_param(&m68k.stopped, sizeof(m68k.stopped));
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}
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/* Z80 */
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save_param(&Z80, sizeof(Z80_Regs));
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/* External HW */
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if (system_hw == SYSTEM_MCD)
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{
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/* CD hardware ID flag */
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char id[4];
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memcpy(id,"SCD!",4);
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save_param(id, 4);
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/* CD hardware */
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bufferptr += scd_context_save(&state[bufferptr]);
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}
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else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
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{
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/* MD cartridge hardware */
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bufferptr += md_cart_context_save(&state[bufferptr]);
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}
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else
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{
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/* MS cartridge hardware */
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bufferptr += sms_cart_context_save(&state[bufferptr]);
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}
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/* return total size */
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return bufferptr;
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}
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