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Genesis-Plus-GX/core/state.c

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/***************************************************************************************
* Genesis Plus
* Savestate support
*
* Copyright (C) 2007-2019 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
int state_load(unsigned char *state)
{
int i, bufferptr = 0;
/* signature check (GENPLUS-GX x.x.x) */
char version[17];
load_param(version,16);
version[16] = 0;
if (memcmp(version,STATE_VERSION,11))
{
return 0;
}
/* version check */
if ((version[11] < 0x31) || (version[13] < 0x37) || (version[15] < 0x35))
{
return 0;
}
/* reset system */
system_reset();
/* enable VDP access for TMSS systems */
for (i=0xc0; i<0xe0; i+=8)
{
m68k.memory_map[i].read8 = vdp_read_byte;
m68k.memory_map[i].read16 = vdp_read_word;
m68k.memory_map[i].write8 = vdp_write_byte;
m68k.memory_map[i].write16 = vdp_write_word;
zbank_memory_map[i].read = zbank_read_vdp;
zbank_memory_map[i].write = zbank_write_vdp;
}
/* GENESIS */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
load_param(work_ram, sizeof(work_ram));
load_param(zram, sizeof(zram));
load_param(&zstate, sizeof(zstate));
load_param(&zbank, sizeof(zbank));
if (zstate == 3)
{
m68k.memory_map[0xa0].read8 = z80_read_byte;
m68k.memory_map[0xa0].read16 = z80_read_word;
m68k.memory_map[0xa0].write8 = z80_write_byte;
m68k.memory_map[0xa0].write16 = z80_write_word;
}
else
{
m68k.memory_map[0xa0].read8 = m68k_read_bus_8;
m68k.memory_map[0xa0].read16 = m68k_read_bus_16;
m68k.memory_map[0xa0].write8 = m68k_unused_8_w;
m68k.memory_map[0xa0].write16 = m68k_unused_16_w;
}
}
else
{
load_param(work_ram, 0x2000);
}
/* IO */
load_param(io_reg, sizeof(io_reg));
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
io_reg[0] = region_code | 0x20 | (config.bios & 1);
}
else
{
io_reg[0] = 0x80 | (region_code >> 1);
}
/* VDP */
bufferptr += vdp_context_load(&state[bufferptr]);
/* SOUND */
bufferptr += sound_context_load(&state[bufferptr]);
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
psg_config(0, config.psg_preamp, 0xff);
}
else
{
psg_config(0, config.psg_preamp, io_reg[6]);
}
/* 68000 */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
uint16 tmp16;
uint32 tmp32;
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_D7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A0, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A1, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A2, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A3, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A4, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A5, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A6, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_A7, tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);
load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
load_param(&tmp32, 4); m68k_set_reg(M68K_REG_ISP,tmp32);
load_param(&m68k.cycles, sizeof(m68k.cycles));
load_param(&m68k.int_level, sizeof(m68k.int_level));
load_param(&m68k.stopped, sizeof(m68k.stopped));
}
/* Z80 */
load_param(&Z80, sizeof(Z80_Regs));
Z80.irq_callback = z80_irq_callback;
/* Extra HW */
if (system_hw == SYSTEM_MCD)
{
/* handle case of MD cartridge using or not CD hardware */
char id[5];
load_param(id,4);
id[4] = 0;
/* check if CD hardware was enabled before attempting to restore */
if (memcmp(id,"SCD!",4))
{
return 0;
}
/* CD hardware */
bufferptr += scd_context_load(&state[bufferptr]);
}
else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
/* MD cartridge hardware */
bufferptr += md_cart_context_load(&state[bufferptr]);
}
else
{
/* MS cartridge hardware */
bufferptr += sms_cart_context_load(&state[bufferptr]);
sms_cart_switch(~io_reg[0x0E]);
}
return bufferptr;
}
int state_save(unsigned char *state)
{
/* buffer size */
int bufferptr = 0;
/* version string */
char version[16];
memcpy(version,STATE_VERSION,16);
save_param(version, 16);
/* GENESIS */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
save_param(work_ram, sizeof(work_ram));
save_param(zram, sizeof(zram));
save_param(&zstate, sizeof(zstate));
save_param(&zbank, sizeof(zbank));
}
else
{
save_param(work_ram, 0x2000);
}
/* IO */
save_param(io_reg, sizeof(io_reg));
/* VDP */
bufferptr += vdp_context_save(&state[bufferptr]);
/* SOUND */
bufferptr += sound_context_save(&state[bufferptr]);
/* 68000 */
if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
uint16 tmp16;
uint32 tmp32;
tmp32 = m68k_get_reg(M68K_REG_D0); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D1); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D2); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D3); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D4); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D5); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D6); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_D7); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A0); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A1); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A2); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A3); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A4); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A5); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A6); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_A7); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_PC); save_param(&tmp32, 4);
tmp16 = m68k_get_reg(M68K_REG_SR); save_param(&tmp16, 2);
tmp32 = m68k_get_reg(M68K_REG_USP); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(M68K_REG_ISP); save_param(&tmp32, 4);
save_param(&m68k.cycles, sizeof(m68k.cycles));
save_param(&m68k.int_level, sizeof(m68k.int_level));
save_param(&m68k.stopped, sizeof(m68k.stopped));
}
/* Z80 */
save_param(&Z80, sizeof(Z80_Regs));
/* External HW */
if (system_hw == SYSTEM_MCD)
{
/* CD hardware ID flag */
char id[4];
memcpy(id,"SCD!",4);
save_param(id, 4);
/* CD hardware */
bufferptr += scd_context_save(&state[bufferptr]);
}
else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
{
/* MD cartridge hardware */
bufferptr += md_cart_context_save(&state[bufferptr]);
}
else
{
/* MS cartridge hardware */
bufferptr += sms_cart_context_save(&state[bufferptr]);
}
/* return total size */
return bufferptr;
}
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