mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-10 16:53:15 +02:00
246 lines
7.5 KiB
C
246 lines
7.5 KiB
C
/***************************************************************************************
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* Genesis Plus
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* Savestate support
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*
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* Copyright (C) 2007-2011 Eke-Eke (GCN/Wii port)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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****************************************************************************************/
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#include "shared.h"
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int state_load(unsigned char *buffer)
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{
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/* buffer size */
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int bufferptr = 0;
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/* first allocate state buffer */
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unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
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if (!state) return 0;
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/* uncompress savestate */
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unsigned long inbytes, outbytes;
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memcpy(&inbytes, buffer, 4);
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outbytes = STATE_SIZE;
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uncompress ((Bytef *)state, &outbytes, (Bytef *)(buffer + 4), inbytes);
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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 (strncmp(version,STATE_VERSION,11))
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{
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free(state);
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return -1;
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}
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/* version check (1.5.0 and above) */
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if ((version[11] < 0x31) || ((version[11] == 0x31) && (version[13] < 0x35)))
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{
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free(state);
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return -1;
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}
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/* reset system */
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system_reset();
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// GENESIS
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if (system_hw == SYSTEM_PBC)
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{
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load_param(work_ram, 0x2000);
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}
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else
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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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/* extended state */
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load_param(&mcycles_68k, sizeof(mcycles_68k));
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load_param(&mcycles_z80, sizeof(mcycles_z80));
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// IO
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if (system_hw == SYSTEM_PBC)
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{
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load_param(&io_reg[0], 1);
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}
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else
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{
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load_param(io_reg, sizeof(io_reg));
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io_reg[0] = region_code | 0x20 | (config.tmss & 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], version);
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// 68000
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if (system_hw != SYSTEM_PBC)
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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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}
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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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// Cartridge HW
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if (system_hw == SYSTEM_PBC)
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{
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bufferptr += sms_cart_context_load(&state[bufferptr]);
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}
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else
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{
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bufferptr += md_cart_context_load(&state[bufferptr]);
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}
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free(state);
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return 1;
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}
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int state_save(unsigned char *buffer)
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{
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/* buffer size */
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int bufferptr = 0;
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/* first allocate state buffer */
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unsigned char *state = (unsigned char *)malloc(STATE_SIZE);
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if (!state) return 0;
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/* version string */
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char version[16];
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strncpy(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)
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{
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save_param(work_ram, 0x2000);
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}
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else
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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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save_param(&mcycles_68k, sizeof(mcycles_68k));
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save_param(&mcycles_z80, sizeof(mcycles_z80));
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// IO
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if (system_hw == SYSTEM_PBC)
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{
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save_param(&io_reg[0], 1);
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}
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else
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{
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save_param(io_reg, sizeof(io_reg));
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}
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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)
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{
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uint16 tmp16;
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uint32 tmp32;
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tmp32 = m68k_get_reg(NULL, M68K_REG_D0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_D7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A0); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A1); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A2); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A3); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A4); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A5); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A6); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_A7); save_param(&tmp32, 4);
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tmp32 = m68k_get_reg(NULL, M68K_REG_PC); save_param(&tmp32, 4);
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tmp16 = m68k_get_reg(NULL, M68K_REG_SR); save_param(&tmp16, 2);
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tmp32 = m68k_get_reg(NULL, M68K_REG_USP); save_param(&tmp32, 4);
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}
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// Z80
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save_param(&Z80, sizeof(Z80_Regs));
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// Cartridge HW
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if (system_hw == SYSTEM_PBC)
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{
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bufferptr += sms_cart_context_save(&state[bufferptr]);
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}
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else
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{
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bufferptr += md_cart_context_save(&state[bufferptr]);
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}
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/* compress state file */
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unsigned long inbytes = bufferptr;
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unsigned long outbytes = STATE_SIZE;
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compress2 ((Bytef *)(buffer + 4), &outbytes, (Bytef *)state, inbytes, 9);
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memcpy(buffer, &outbytes, 4);
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free(state);
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/* return total size */
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return (outbytes + 4);
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}
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