Genesis-Plus-GX/source/state.c

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/***************************************************************************************
* Genesis Plus
* Savestate support
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*
* Copyright (C) 2007, 2008, 2009 Eke-Eke (GCN/Wii port)
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
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****************************************************************************************/
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#include "shared.h"
static unsigned char state[STATE_SIZE];
#define load_param(param, size) \
memcpy(param, &state[bufferptr], size); \
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bufferptr+= size;
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#define save_param(param, size) \
memcpy(&state[bufferptr], param, size); \
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bufferptr+= size;
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int state_load(unsigned char *buffer)
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{
/* buffer size */
int bufferptr = 0;
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/* uncompress savestate */
unsigned long inbytes, outbytes;
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memcpy(&inbytes, buffer, 4);
outbytes = STATE_SIZE;
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uncompress ((Bytef *)state, &outbytes, (Bytef *)(buffer + 4), inbytes);
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/* version check */
char version[16];
load_param(version,16);
if (strncmp(version,STATE_VERSION,16))
{
return 0;
}
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/* reset system */
system_reset();
m68k_memory_map[0].base = cart.base;
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// GENESIS
load_param(work_ram, sizeof(work_ram));
load_param(zram, sizeof(zram));
load_param(&zstate, sizeof(zstate));
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load_param(&zbank, sizeof(zbank));
// IO
load_param(io_reg, sizeof(io_reg));
// VDP
uint8 temp_reg[0x20];
load_param(sat, sizeof(sat));
load_param(vram, sizeof(vram));
load_param(cram, sizeof(cram));
load_param(vsram, sizeof(vsram));
load_param(temp_reg, sizeof(temp_reg));
load_param(&addr, sizeof(addr));
load_param(&addr_latch, sizeof(addr_latch));
load_param(&code, sizeof(code));
load_param(&pending, sizeof(pending));
load_param(&status, sizeof(status));
load_param(&dmafill, sizeof(dmafill));
load_param(&hint_pending, sizeof(hint_pending));
load_param(&vint_pending, sizeof(vint_pending));
load_param(&irq_status, sizeof(irq_status));
vdp_restore(temp_reg);
// FM
YM2612Restore(&state[bufferptr]);
bufferptr+= YM2612GetContextSize();
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// PSG
load_param(SN76489_GetContextPtr(),SN76489_GetContextSize());
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// 68000
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);
// Z80
load_param(&Z80, sizeof(Z80_Regs));
return 1;
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}
int state_save(unsigned char *buffer)
{
/* buffer size */
int bufferptr = 0;
/* version string */
char version[16];
strncpy(version,STATE_VERSION,16);
save_param(version, 16);
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// GENESIS
save_param(work_ram, sizeof(work_ram));
save_param(zram, sizeof(zram));
save_param(&zstate, sizeof(zstate));
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save_param(&zbank, sizeof(zbank));
// IO
save_param(io_reg, sizeof(io_reg));
// VDP
save_param(sat, sizeof(sat));
save_param(vram, sizeof(vram));
save_param(cram, sizeof(cram));
save_param(vsram, sizeof(vsram));
save_param(reg, sizeof(reg));
save_param(&addr, sizeof(addr));
save_param(&addr_latch, sizeof(addr_latch));
save_param(&code, sizeof(code));
save_param(&pending, sizeof(pending));
save_param(&status, sizeof(status));
save_param(&dmafill, sizeof(dmafill));
save_param(&hint_pending, sizeof(hint_pending));
save_param(&vint_pending, sizeof(vint_pending));
save_param(&irq_status, sizeof(irq_status));
// FM
save_param(YM2612GetContextPtr(),YM2612GetContextSize());
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// PSG
save_param(SN76489_GetContextPtr(),SN76489_GetContextSize());
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// 68000
uint16 tmp16;
uint32 tmp32;
tmp32 = m68k_get_reg(NULL, M68K_REG_D0); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D1); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D2); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D3); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D4); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D5); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D6); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_D7); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A0); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A1); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A2); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A3); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A4); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A5); save_param(&tmp32, 4);
tmp32 = m68k_get_reg(NULL, M68K_REG_A6); save_param(&tmp32, 4);
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);
tmp16 = m68k_get_reg(NULL, M68K_REG_SR); save_param(&tmp16, 2);
tmp32 = m68k_get_reg(NULL, M68K_REG_USP); save_param(&tmp32, 4);
// Z80
save_param(&Z80, sizeof(Z80_Regs));
/* compress state file */
unsigned long inbytes = bufferptr;
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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/* return total size */
return (outbytes + 4);
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}