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memory.c
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/*
* memory.c - memory emulation
*
* Copyright (C) 1995-1998 David Firth
* Copyright (C) 1998-2008 Atari800 development team (see DOC/CREDITS)
*
* This file is part of the Atari800 emulator project which emulates
* the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
*
* Atari800 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.
*
* Atari800 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 Atari800; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "atari.h"
#include "antic.h"
#include "cpu.h"
#include "cartridge.h"
#include "roms/altirra_5200_os.h"
#include "esc.h"
#include "gtia.h"
#include "log.h"
#include "memory.h"
#include "pbi.h"
#include "pia.h"
#include "pokey.h"
#include "util.h"
#ifndef BASIC
#include "statesav.h"
#endif
UBYTE MEMORY_mem[65536 + 2];
int MEMORY_ram_size = 64;
#ifndef PAGED_ATTRIB
UBYTE MEMORY_attrib[65536];
#else /* PAGED_ATTRIB */
MEMORY_rdfunc MEMORY_readmap[256];
MEMORY_wrfunc MEMORY_writemap[256];
typedef struct map_save {
int code;
MEMORY_rdfunc rdptr;
MEMORY_wrfunc wrptr;
} map_save;
void MEMORY_ROM_PutByte(UWORD addr, UBYTE value)
{
}
map_save save_map[2] = {
{0, NULL, NULL}, /* RAM */
{1, NULL, MEMORY_ROM_PutByte} /* ROM */
};
#endif /* PAGED_ATTRIB */
UBYTE MEMORY_basic[8192];
UBYTE MEMORY_os[16384];
UBYTE MEMORY_xegame[8192];
int MEMORY_xe_bank = 0;
int MEMORY_selftest_enabled = 0;
static UBYTE under_atarixl_os[16384];
static UBYTE under_cart809F[8192];
static UBYTE under_cartA0BF[8192];
static int cart809F_enabled = FALSE;
int MEMORY_cartA0BF_enabled = FALSE;
static UBYTE *atarixe_memory = NULL;
static ULONG atarixe_memory_size = 0;
/* RAM shadowed by Self-Test in the XE bank seen by ANTIC, when ANTIC/CPU
separate XE access is active. */
static UBYTE antic_bank_under_selftest[0x800];
int MEMORY_have_basic = FALSE; /* Atari BASIC image has been successfully read (Atari 800 only) */
/* Axlon and Mosaic RAM expansions for Atari 400/800 only */
static void MosaicPutByte(UWORD addr, UBYTE byte);
static UBYTE MosaicGetByte(UWORD addr, int no_side_effects);
static void AxlonPutByte(UWORD addr, UBYTE byte);
static UBYTE AxlonGetByte(UWORD addr, int no_side_effects);
static UBYTE *axlon_ram = NULL;
static int axlon_current_bankmask = 0;
int axlon_curbank = 0;
int MEMORY_axlon_num_banks = 0x00;
int MEMORY_axlon_0f_mirror = FALSE; /* The real Axlon had a mirror bank register at 0x0fc0-0x0fff, compatibles did not*/
static UBYTE *mosaic_ram = NULL;
static int mosaic_current_num_banks = 0;
static int mosaic_curbank = 0x3f;
int MEMORY_mosaic_num_banks = 0;
int MEMORY_enable_mapram = FALSE;
/* Buffer for storing of MapRAM memory. */
static UBYTE *mapram_memory = NULL;
static void alloc_axlon_memory(void){
if (MEMORY_axlon_num_banks > 0 && Atari800_machine_type == Atari800_MACHINE_800) {
int size = MEMORY_axlon_num_banks * 0x4000;
if (axlon_ram == NULL || axlon_current_bankmask != MEMORY_axlon_num_banks - 1) {
axlon_current_bankmask = MEMORY_axlon_num_banks - 1;
axlon_ram = (UBYTE *)Util_realloc(axlon_ram, size);
}
memset(axlon_ram, 0, size);
} else {
if (axlon_ram != NULL) {
free(axlon_ram);
axlon_ram = NULL;
axlon_current_bankmask = 0;
}
}
}
static void alloc_mosaic_memory(void){
if (MEMORY_mosaic_num_banks > 0 && Atari800_machine_type == Atari800_MACHINE_800) {
int size = MEMORY_mosaic_num_banks * 0x1000;
if (mosaic_ram == NULL || mosaic_current_num_banks != MEMORY_mosaic_num_banks) {
mosaic_current_num_banks = MEMORY_mosaic_num_banks;
mosaic_ram = (UBYTE *)Util_realloc(mosaic_ram, size);
}
memset(mosaic_ram, 0, size);
} else {
if (mosaic_ram != NULL) {
free(mosaic_ram);
mosaic_ram = NULL;
mosaic_current_num_banks = 0;
}
}
}
static void AllocXEMemory(void)
{
if (MEMORY_ram_size > 64) {
/* don't count 64 KB of base memory */
/* count number of 16 KB banks, add 1 for saving base memory 0x4000-0x7fff */
ULONG size = (1 + (MEMORY_ram_size - 64) / 16) * 16384;
if (size != atarixe_memory_size) {
if (atarixe_memory != NULL)
free(atarixe_memory);
atarixe_memory = (UBYTE *) Util_malloc(size);
atarixe_memory_size = size;
memset(atarixe_memory, 0, size);
}
}
/* atarixe_memory not needed, free it */
else if (atarixe_memory != NULL) {
free(atarixe_memory);
atarixe_memory = NULL;
atarixe_memory_size = 0;
}
}
static void AllocMapRAM(void)
{
if (MEMORY_enable_mapram && Atari800_machine_type == Atari800_MACHINE_XLXE
&& MEMORY_ram_size > 20) {
if (mapram_memory == NULL)
mapram_memory = (UBYTE *)Util_malloc(0x800);
}
else if (mapram_memory != NULL) {
free(mapram_memory);
mapram_memory = NULL;
}
}
int MEMORY_SizeValid(int size)
{
return size == 8 || size == 16 || size == 24 || size == 32
|| size == 40 || size == 48 || size == 52 || size == 64
|| size == 128 || size == 192 || size == MEMORY_RAM_320_RAMBO
|| size == MEMORY_RAM_320_COMPY_SHOP || size == 576 || size == 1088;
}
void MEMORY_InitialiseMachine(void)
{
int const os_size = Atari800_machine_type == Atari800_MACHINE_800 ? 0x2800
: Atari800_machine_type == Atari800_MACHINE_5200 ? 0x800
: 0x4000;
int const os_rom_start = 0x10000 - os_size;
ANTIC_xe_ptr = NULL;
cart809F_enabled = FALSE;
MEMORY_cartA0BF_enabled = FALSE;
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
GTIA_TRIG[3] = 0;
if (GTIA_GRACTL & 4)
GTIA_TRIG_latch[3] = 0;
}
memcpy(MEMORY_mem + os_rom_start, MEMORY_os, os_size);
switch (Atari800_machine_type) {
case Atari800_MACHINE_5200:
MEMORY_dFillMem(0x0000, 0x00, 0xf800);
MEMORY_SetRAM(0x0000, 0x3fff);
MEMORY_SetROM(0x4000, 0xffff);
#ifndef PAGED_ATTRIB
MEMORY_SetHARDWARE(0xc000, 0xcfff); /* 5200 GTIA Chip */
MEMORY_SetHARDWARE(0xd400, 0xd4ff); /* 5200 ANTIC Chip */
MEMORY_SetHARDWARE(0xe800, 0xefff); /* 5200 POKEY Chip */
#else
MEMORY_readmap[0xc0] = GTIA_GetByte;
MEMORY_readmap[0xc1] = GTIA_GetByte;
MEMORY_readmap[0xc2] = GTIA_GetByte;
MEMORY_readmap[0xc3] = GTIA_GetByte;
MEMORY_readmap[0xc4] = GTIA_GetByte;
MEMORY_readmap[0xc5] = GTIA_GetByte;
MEMORY_readmap[0xc6] = GTIA_GetByte;
MEMORY_readmap[0xc7] = GTIA_GetByte;
MEMORY_readmap[0xc8] = GTIA_GetByte;
MEMORY_readmap[0xc9] = GTIA_GetByte;
MEMORY_readmap[0xca] = GTIA_GetByte;
MEMORY_readmap[0xcb] = GTIA_GetByte;
MEMORY_readmap[0xcc] = GTIA_GetByte;
MEMORY_readmap[0xcd] = GTIA_GetByte;
MEMORY_readmap[0xce] = GTIA_GetByte;
MEMORY_readmap[0xcf] = GTIA_GetByte;
MEMORY_readmap[0xd4] = ANTIC_GetByte;
MEMORY_readmap[0xe8] = POKEY_GetByte;
MEMORY_readmap[0xe9] = POKEY_GetByte;
MEMORY_readmap[0xea] = POKEY_GetByte;
MEMORY_readmap[0xeb] = POKEY_GetByte;
MEMORY_readmap[0xec] = POKEY_GetByte;
MEMORY_readmap[0xed] = POKEY_GetByte;
MEMORY_readmap[0xee] = POKEY_GetByte;
MEMORY_readmap[0xef] = POKEY_GetByte;
MEMORY_writemap[0xc0] = GTIA_PutByte;
MEMORY_writemap[0xc1] = GTIA_PutByte;
MEMORY_writemap[0xc2] = GTIA_PutByte;
MEMORY_writemap[0xc3] = GTIA_PutByte;
MEMORY_writemap[0xc4] = GTIA_PutByte;
MEMORY_writemap[0xc5] = GTIA_PutByte;
MEMORY_writemap[0xc6] = GTIA_PutByte;
MEMORY_writemap[0xc7] = GTIA_PutByte;
MEMORY_writemap[0xc8] = GTIA_PutByte;
MEMORY_writemap[0xc9] = GTIA_PutByte;
MEMORY_writemap[0xca] = GTIA_PutByte;
MEMORY_writemap[0xcb] = GTIA_PutByte;
MEMORY_writemap[0xcc] = GTIA_PutByte;
MEMORY_writemap[0xcd] = GTIA_PutByte;
MEMORY_writemap[0xce] = GTIA_PutByte;
MEMORY_writemap[0xcf] = GTIA_PutByte;
MEMORY_writemap[0xd4] = ANTIC_PutByte;
MEMORY_writemap[0xe8] = POKEY_PutByte;
MEMORY_writemap[0xe9] = POKEY_PutByte;
MEMORY_writemap[0xea] = POKEY_PutByte;
MEMORY_writemap[0xeb] = POKEY_PutByte;
MEMORY_writemap[0xec] = POKEY_PutByte;
MEMORY_writemap[0xed] = POKEY_PutByte;
MEMORY_writemap[0xee] = POKEY_PutByte;
MEMORY_writemap[0xef] = POKEY_PutByte;
#endif
break;
default:
{
int const base_ram = MEMORY_ram_size > 64 ? 64 * 1024 : MEMORY_ram_size * 1024;
int const hole_end = (os_rom_start < 0xd000 ? os_rom_start : 0xd000);
int const hole_start = base_ram > hole_end ? hole_end : base_ram;
ESC_PatchOS();
MEMORY_dFillMem(0x0000, 0x00, hole_start);
MEMORY_SetRAM(0x0000, hole_start - 1);
if (hole_start < hole_end) {
MEMORY_dFillMem(hole_start, 0xff, hole_end - hole_start);
MEMORY_SetROM(hole_start, hole_end - 1);
}
if (hole_end < 0xd000)
MEMORY_SetROM(hole_end, 0xcfff);
MEMORY_SetROM(0xd800, 0xffff);
#ifndef PAGED_ATTRIB
MEMORY_SetHARDWARE(0xd000, 0xd7ff);
if (Atari800_machine_type == Atari800_MACHINE_800) {
if (MEMORY_mosaic_num_banks > 0) MEMORY_SetHARDWARE(0xff00, 0xffff);
/* only 0xffc0-0xffff are used, but mark the whole
* page to make state saving easier */
if (MEMORY_axlon_num_banks > 0) {
MEMORY_SetHARDWARE(0xcf00, 0xcfff);
if (MEMORY_axlon_0f_mirror) MEMORY_SetHARDWARE(0x0f00, 0x0fff);
/* only ?fc0-?fff are used, but mark the whole page*/
}
}
#else
MEMORY_readmap[0xd0] = GTIA_GetByte;
MEMORY_readmap[0xd1] = PBI_D1GetByte;
MEMORY_readmap[0xd2] = POKEY_GetByte;
MEMORY_readmap[0xd3] = PIA_GetByte;
MEMORY_readmap[0xd4] = ANTIC_GetByte;
MEMORY_readmap[0xd5] = CARTRIDGE_GetByte;
MEMORY_readmap[0xd6] = PBI_D6GetByte;
MEMORY_readmap[0xd7] = PBI_D7GetByte;
MEMORY_writemap[0xd0] = GTIA_PutByte;
MEMORY_writemap[0xd1] = PBI_D1PutByte;
MEMORY_writemap[0xd2] = POKEY_PutByte;
MEMORY_writemap[0xd3] = PIA_PutByte;
MEMORY_writemap[0xd4] = ANTIC_PutByte;
MEMORY_writemap[0xd5] = CARTRIDGE_PutByte;
MEMORY_writemap[0xd6] = PBI_D6PutByte;
MEMORY_writemap[0xd7] = PBI_D7PutByte;
if (Atari800_machine_type == Atari800_MACHINE_800) {
if (MEMORY_mosaic_num_banks > 0) MEMORY_writemap[0xff] = MosaicPutByte;
if (MEMORY_axlon_num_banks > 0) {
MEMORY_writemap[0xcf] = AxlonPutByte;
if (MEMORY_axlon_0f_mirror)
MEMORY_writemap[0x0f] = AxlonPutByte;
}
}
#endif
}
break;
}
AllocXEMemory();
alloc_axlon_memory();
alloc_mosaic_memory();
axlon_curbank = 0;
mosaic_curbank = 0x3f;
AllocMapRAM();
Atari800_Coldstart();
}
#ifndef BASIC
#if defined(__LIBRETRO__)
void Retro_MEMORY_StateSave(UBYTE SaveVerbose)
{
int temp;
UBYTE byte;
/* Axlon/Mosaic for 400/800 */
if (Atari800_machine_type == Atari800_MACHINE_800) {
Retro_SaveINT(&MEMORY_axlon_num_banks, 1);
if (MEMORY_axlon_num_banks > 0) {
Retro_SaveINT(&axlon_curbank, 1);
Retro_SaveINT(&MEMORY_axlon_0f_mirror, 1);
Retro_SaveUBYTE(axlon_ram, MEMORY_axlon_num_banks * 0x4000);
}
Retro_SaveINT(&mosaic_current_num_banks, 1);
if (mosaic_current_num_banks > 0) {
Retro_SaveINT(&mosaic_curbank, 1);
Retro_SaveUBYTE(mosaic_ram, mosaic_current_num_banks * 0x1000);
}
}
/* Save amount of base RAM in kilobytes. */
temp = MEMORY_ram_size > 64 ? 64 : MEMORY_ram_size;
Retro_SaveINT(&temp, 1);
Retro_SaveUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
Retro_SaveUBYTE(&MEMORY_attrib[0], 65536);
#else
{
/* I assume here that consecutive calls to StateSav_SaveUBYTE()
are equivalent to a single call with all the values
(i.e. StateSav_SaveUBYTE() doesn't write any headers). */
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
if (MEMORY_writemap[i] == NULL)
memset(attrib_page, MEMORY_RAM, 256);
else if (MEMORY_writemap[i] == MEMORY_ROM_PutByte)
memset(attrib_page, MEMORY_ROM, 256);
else if (i == 0x4f || i == 0x5f || i == 0x8f || i == 0x9f) {
/* special case: Bounty Bob bank switching registers */
memset(attrib_page, MEMORY_ROM, 256);
attrib_page[0xf6] = MEMORY_HARDWARE;
attrib_page[0xf7] = MEMORY_HARDWARE;
attrib_page[0xf8] = MEMORY_HARDWARE;
attrib_page[0xf9] = MEMORY_HARDWARE;
}
else {
memset(attrib_page, MEMORY_HARDWARE, 256);
}
Retro_SaveUBYTE(&attrib_page[0], 256);
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose != 0)
Retro_SaveUBYTE(&MEMORY_basic[0], 8192);
Retro_SaveUBYTE(&under_cartA0BF[0], 8192);
if (SaveVerbose != 0)
Retro_SaveUBYTE(&MEMORY_os[0], 16384);
Retro_SaveUBYTE(&under_atarixl_os[0], 16384);
if (SaveVerbose != 0)
Retro_SaveUBYTE(MEMORY_xegame, 0x2000);
}
/* Save amount of XE RAM in 16KB banks. */
temp = (MEMORY_ram_size - 64) / 16;
if (temp < 0)
temp = 0;
Retro_SaveINT(&temp, 1);
if (MEMORY_ram_size == MEMORY_RAM_320_RAMBO || MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP) {
/* Save specific banking type. */
temp = MEMORY_ram_size - 320;
Retro_SaveINT(&temp, 1);
}
byte = PIA_PORTB | PIA_PORTB_mask;
Retro_SaveUBYTE(&byte, 1);
Retro_SaveINT(&MEMORY_cartA0BF_enabled, 1);
if (MEMORY_ram_size > 64) {
Retro_SaveUBYTE(&atarixe_memory[0], atarixe_memory_size);
if (ANTIC_xe_ptr != NULL && MEMORY_selftest_enabled)
Retro_SaveUBYTE(antic_bank_under_selftest, 0x800);
}
/* Simius XL/XE MapRAM expansion */
if (Atari800_machine_type == Atari800_MACHINE_XLXE && MEMORY_ram_size > 20) {
Retro_SaveINT(&MEMORY_enable_mapram, 1);
if (MEMORY_enable_mapram) {
Retro_SaveUBYTE(mapram_memory, 0x800);
}
}
}
void Retro_MEMORY_StateRead(UBYTE SaveVerbose, UBYTE StateVersion)
{
int base_ram_kb;
int num_xe_banks;
UBYTE portb;
/* Axlon/Mosaic for 400/800 */
if (Atari800_machine_type == Atari800_MACHINE_800 && StateVersion >= 5) {
Retro_ReadINT(&MEMORY_axlon_num_banks, 1);
if (MEMORY_axlon_num_banks > 0) {
Retro_ReadINT(&axlon_curbank, 1);
if (StateVersion < 7) {
/* Read bank mask, then increase by 1 to get number of banks. */
Retro_ReadINT(&MEMORY_axlon_num_banks, 1);
++MEMORY_axlon_num_banks;
}
Retro_ReadINT(&MEMORY_axlon_0f_mirror, 1);
if (StateVersion < 7) {
int temp;
/* Ignore saved RAM size - can be derived. */
Retro_ReadINT(&temp, 1);
}
alloc_axlon_memory();
Retro_ReadUBYTE(axlon_ram, MEMORY_axlon_num_banks * 0x4000);
}
Retro_ReadINT(&MEMORY_mosaic_num_banks, 1);
if (MEMORY_mosaic_num_banks > 0) {
Retro_ReadINT(&mosaic_curbank, 1);
if (StateVersion < 7) {
int temp;
/* Read max bank number, then increase by 1 to get number of banks. */
Retro_ReadINT(&MEMORY_mosaic_num_banks, 1);
++MEMORY_mosaic_num_banks;
Retro_ReadINT(&temp, 1); /* Ignore Mosaic RAM size - can be derived. */
}
alloc_mosaic_memory();
Retro_ReadUBYTE(mosaic_ram, mosaic_current_num_banks * 0x1000);
}
}
if (StateVersion >= 7)
/* Read amount of base RAM in kilobytes. */
Retro_ReadINT(&base_ram_kb, 1);
Retro_ReadUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
Retro_ReadUBYTE(&MEMORY_attrib[0], 65536);
#else
{
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
Retro_ReadUBYTE(&attrib_page[0], 256);
/* note: 0x40 is intentional here:
we want ROM on page 0xd1 if H: patches are enabled */
switch (attrib_page[0x40]) {
case MEMORY_RAM:
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = NULL;
break;
case MEMORY_ROM:
if (i != 0xd1 && attrib_page[0xf6] == MEMORY_HARDWARE) {
if (i == 0x4f || i == 0x8f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob1GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob1PutByte;
}
else if (i == 0x5f || i == 0x9f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob2GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob2PutByte;
}
else if (i == 0xbf) {
MEMORY_readmap[i] = CARTRIDGE_5200SuperCartGetByte;
MEMORY_writemap[i] = CARTRIDGE_5200SuperCartPutByte;
}
/* else something's wrong, so we keep current values */
}
else {
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = MEMORY_ROM_PutByte;
}
break;
case MEMORY_HARDWARE:
switch (i) {
case 0xc0:
case 0xd0:
MEMORY_readmap[i] = GTIA_GetByte;
MEMORY_writemap[i] = GTIA_PutByte;
break;
case 0xd1:
MEMORY_readmap[i] = PBI_D1GetByte;
MEMORY_writemap[i] = PBI_D1PutByte;
break;
case 0xd2:
case 0xe8:
case 0xeb:
MEMORY_readmap[i] = POKEY_GetByte;
MEMORY_writemap[i] = POKEY_PutByte;
break;
case 0xd3:
MEMORY_readmap[i] = PIA_GetByte;
MEMORY_writemap[i] = PIA_PutByte;
break;
case 0xd4:
MEMORY_readmap[i] = ANTIC_GetByte;
MEMORY_writemap[i] = ANTIC_PutByte;
break;
case 0xd5:
MEMORY_readmap[i] = CARTRIDGE_GetByte;
MEMORY_writemap[i] = CARTRIDGE_PutByte;
break;
case 0xd6:
MEMORY_readmap[i] = PBI_D6GetByte;
MEMORY_writemap[i] = PBI_D6PutByte;
break;
case 0xd7:
MEMORY_readmap[i] = PBI_D7GetByte;
MEMORY_writemap[i] = PBI_D7PutByte;
break;
case 0xff:
if (MEMORY_mosaic_num_banks > 0) MEMORY_writemap[0xff] = MosaicPutByte;
break;
case 0xcf:
if (MEMORY_axlon_num_banks > 0) MEMORY_writemap[0xcf] = AxlonPutByte;
break;
case 0x0f:
if (MEMORY_axlon_num_banks > 0 && MEMORY_axlon_0f_mirror) MEMORY_writemap[0x0f] = AxlonPutByte;
break;
default:
/* something's wrong, so we keep current values */
break;
}
break;
default:
/* something's wrong, so we keep current values */
break;
}
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose)
Retro_ReadUBYTE(&MEMORY_basic[0], 8192);
Retro_ReadUBYTE(&under_cartA0BF[0], 8192);
if (SaveVerbose)
Retro_ReadUBYTE(&MEMORY_os[0], 16384);
Retro_ReadUBYTE(&under_atarixl_os[0], 16384);
if (StateVersion >= 7 && SaveVerbose)
Retro_ReadUBYTE(MEMORY_xegame, 0x2000);
}
if (StateVersion >= 7) {
/* Read amount of XE RAM in 16KB banks. */
Retro_ReadINT(&num_xe_banks, 1);
/* Compute value of MEMORY_ram_size. */
MEMORY_ram_size = base_ram_kb + num_xe_banks * 16;
if (MEMORY_ram_size == 320) {
/* There are 2 different memory mappings for 320 KB. */
/* In savestate version <= 6 this variable is read in PIA_StateRead. */
int xe_type;
Retro_ReadINT(&xe_type, 1);
MEMORY_ram_size += xe_type;
}
if (!MEMORY_SizeValid(MEMORY_ram_size)) {
MEMORY_ram_size = 64;
Log_print("Warning: Bad RAM size read in from state save, defaulting to 64 KB");
}
/* Read PORTB and set variables that are based on it. */
Retro_ReadUBYTE(&portb, 1);
MEMORY_xe_bank = 0;
if (MEMORY_ram_size > 64 && (portb & 0x30) != 0x30) {
switch (MEMORY_ram_size) {
case 128:
MEMORY_xe_bank = ((portb & 0x0c) >> 2) + 1;
break;
case 192:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0x40) >> 2)) >> 2) + 1;
break;
case MEMORY_RAM_320_RAMBO:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0x60) >> 1)) >> 2) + 1;
break;
case MEMORY_RAM_320_COMPY_SHOP:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0xc0) >> 2)) >> 2) + 1;
break;
case 576:
MEMORY_xe_bank = (((portb & 0x0e) + ((portb & 0x60) >> 1)) >> 1) + 1;
break;
case 1088:
MEMORY_xe_bank = (((portb & 0x0e) + ((portb & 0xe0) >> 1)) >> 1) + 1;
break;
}
}
/* In savestate version <= 6 this variable is read in PIA_StateRead. */
MEMORY_selftest_enabled = (portb & 0x81) == 0x01
&& !((portb & 0x30) != 0x30 && MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)
&& !((portb & 0x10) == 0 && MEMORY_ram_size == 1088);
Retro_ReadINT(&MEMORY_cartA0BF_enabled, 1);
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
GTIA_TRIG[3] = MEMORY_cartA0BF_enabled;
if (MEMORY_cartA0BF_enabled == 0 && (GTIA_GRACTL & 4))
GTIA_TRIG_latch[3] = 0;
}
}
ANTIC_xe_ptr = NULL;
AllocXEMemory();
if (MEMORY_ram_size > 64) {
Retro_ReadUBYTE(&atarixe_memory[0], atarixe_memory_size);
/* a hack that makes state files compatible with previous versions:
for 130 XE there's written 192 KB of unused data */
if (MEMORY_ram_size == 128 && StateVersion <= 6) {
UBYTE buffer[256];
int i;
for (i = 0; i < 192 * 4; i++)
Retro_ReadUBYTE(&buffer[0], 256);
}
if (StateVersion >= 7 && (MEMORY_ram_size == 128 || MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)) {
switch (portb & 0x30) {
case 0x20: /* ANTIC: base, CPU: extended */
ANTIC_xe_ptr = atarixe_memory;
break;
case 0x10: /* ANTIC: extended, CPU: base */
ANTIC_xe_ptr = atarixe_memory + (MEMORY_xe_bank << 14);
break;
default: /* ANTIC same as CPU */
ANTIC_xe_ptr = NULL;
break;
}
if (ANTIC_xe_ptr != NULL && MEMORY_selftest_enabled)
/* Also read ANTIC-visible memory shadowed by Self Test. */
Retro_ReadUBYTE(antic_bank_under_selftest, 0x800);
}
}
/* Simius XL/XE MapRAM expansion */
if (StateVersion >= 7 && Atari800_machine_type == Atari800_MACHINE_XLXE && MEMORY_ram_size > 20) {
Retro_ReadINT(&MEMORY_enable_mapram, 1);
AllocMapRAM();
if (mapram_memory != NULL) {
Retro_ReadUBYTE(mapram_memory, 0x800);
}
}
}
#endif /* __LIBRETRO__ */
void MEMORY_StateSave(UBYTE SaveVerbose)
{
int temp;
UBYTE byte;
/* Axlon/Mosaic for 400/800 */
if (Atari800_machine_type == Atari800_MACHINE_800) {
StateSav_SaveINT(&MEMORY_axlon_num_banks, 1);
if (MEMORY_axlon_num_banks > 0){
StateSav_SaveINT(&axlon_curbank, 1);
StateSav_SaveINT(&MEMORY_axlon_0f_mirror, 1);
StateSav_SaveUBYTE(axlon_ram, MEMORY_axlon_num_banks * 0x4000);
}
StateSav_SaveINT(&mosaic_current_num_banks, 1);
if (mosaic_current_num_banks > 0) {
StateSav_SaveINT(&mosaic_curbank, 1);
StateSav_SaveUBYTE(mosaic_ram, mosaic_current_num_banks * 0x1000);
}
}
/* Save amount of base RAM in kilobytes. */
temp = MEMORY_ram_size > 64 ? 64 : MEMORY_ram_size;
StateSav_SaveINT(&temp, 1);
StateSav_SaveUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
StateSav_SaveUBYTE(&MEMORY_attrib[0], 65536);
#else
{
/* I assume here that consecutive calls to StateSav_SaveUBYTE()
are equivalent to a single call with all the values
(i.e. StateSav_SaveUBYTE() doesn't write any headers). */
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
if (MEMORY_writemap[i] == NULL)
memset(attrib_page, MEMORY_RAM, 256);
else if (MEMORY_writemap[i] == MEMORY_ROM_PutByte)
memset(attrib_page, MEMORY_ROM, 256);
else if (i == 0x4f || i == 0x5f || i == 0x8f || i == 0x9f) {
/* special case: Bounty Bob bank switching registers */
memset(attrib_page, MEMORY_ROM, 256);
attrib_page[0xf6] = MEMORY_HARDWARE;
attrib_page[0xf7] = MEMORY_HARDWARE;
attrib_page[0xf8] = MEMORY_HARDWARE;
attrib_page[0xf9] = MEMORY_HARDWARE;
}
else {
memset(attrib_page, MEMORY_HARDWARE, 256);
}
StateSav_SaveUBYTE(&attrib_page[0], 256);
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose != 0)
StateSav_SaveUBYTE(&MEMORY_basic[0], 8192);
StateSav_SaveUBYTE(&under_cartA0BF[0], 8192);
if (SaveVerbose != 0)
StateSav_SaveUBYTE(&MEMORY_os[0], 16384);
StateSav_SaveUBYTE(&under_atarixl_os[0], 16384);
if (SaveVerbose != 0)
StateSav_SaveUBYTE(MEMORY_xegame, 0x2000);
}
/* Save amount of XE RAM in 16KB banks. */
temp = (MEMORY_ram_size - 64) / 16;
if (temp < 0)
temp = 0;
StateSav_SaveINT(&temp, 1);
if (MEMORY_ram_size == MEMORY_RAM_320_RAMBO || MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP) {
/* Save specific banking type. */
temp = MEMORY_ram_size - 320;
StateSav_SaveINT(&temp, 1);
}
byte = PIA_PORTB | PIA_PORTB_mask;
StateSav_SaveUBYTE(&byte, 1);
StateSav_SaveINT(&MEMORY_cartA0BF_enabled, 1);
if (MEMORY_ram_size > 64) {
StateSav_SaveUBYTE(&atarixe_memory[0], atarixe_memory_size);
if (ANTIC_xe_ptr != NULL && MEMORY_selftest_enabled)
StateSav_SaveUBYTE(antic_bank_under_selftest, 0x800);
}
/* Simius XL/XE MapRAM expansion */
if (Atari800_machine_type == Atari800_MACHINE_XLXE && MEMORY_ram_size > 20) {
StateSav_SaveINT(&MEMORY_enable_mapram, 1);
if (MEMORY_enable_mapram) {
StateSav_SaveUBYTE( mapram_memory, 0x800 );
}
}
}
void MEMORY_StateRead(UBYTE SaveVerbose, UBYTE StateVersion)
{
int base_ram_kb;
int num_xe_banks;
UBYTE portb;
/* Axlon/Mosaic for 400/800 */
if (Atari800_machine_type == Atari800_MACHINE_800 && StateVersion >= 5) {
StateSav_ReadINT(&MEMORY_axlon_num_banks, 1);
if (MEMORY_axlon_num_banks > 0){
StateSav_ReadINT(&axlon_curbank, 1);
if (StateVersion < 7) {
/* Read bank mask, then increase by 1 to get number of banks. */
StateSav_ReadINT(&MEMORY_axlon_num_banks, 1);
++ MEMORY_axlon_num_banks;
}
StateSav_ReadINT(&MEMORY_axlon_0f_mirror, 1);
if (StateVersion < 7) {
int temp;
/* Ignore saved RAM size - can be derived. */
StateSav_ReadINT(&temp, 1);
}
alloc_axlon_memory();
StateSav_ReadUBYTE(axlon_ram, MEMORY_axlon_num_banks * 0x4000);
}
StateSav_ReadINT(&MEMORY_mosaic_num_banks, 1);
if (MEMORY_mosaic_num_banks > 0) {
StateSav_ReadINT(&mosaic_curbank, 1);
if (StateVersion < 7) {
int temp;
/* Read max bank number, then increase by 1 to get number of banks. */
StateSav_ReadINT(&MEMORY_mosaic_num_banks, 1);
++ MEMORY_mosaic_num_banks;
StateSav_ReadINT(&temp, 1); /* Ignore Mosaic RAM size - can be derived. */
}
alloc_mosaic_memory();
StateSav_ReadUBYTE(mosaic_ram, mosaic_current_num_banks * 0x1000);
}
}
if (StateVersion >= 7)
/* Read amount of base RAM in kilobytes. */
StateSav_ReadINT(&base_ram_kb, 1);
StateSav_ReadUBYTE(&MEMORY_mem[0], 65536);
#ifndef PAGED_ATTRIB
StateSav_ReadUBYTE(&MEMORY_attrib[0], 65536);
#else
{
UBYTE attrib_page[256];
int i;
for (i = 0; i < 256; i++) {
StateSav_ReadUBYTE(&attrib_page[0], 256);
/* note: 0x40 is intentional here:
we want ROM on page 0xd1 if H: patches are enabled */
switch (attrib_page[0x40]) {
case MEMORY_RAM:
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = NULL;
break;
case MEMORY_ROM:
if (i != 0xd1 && attrib_page[0xf6] == MEMORY_HARDWARE) {
if (i == 0x4f || i == 0x8f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob1GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob1PutByte;
}
else if (i == 0x5f || i == 0x9f) {
MEMORY_readmap[i] = CARTRIDGE_BountyBob2GetByte;
MEMORY_writemap[i] = CARTRIDGE_BountyBob2PutByte;
}
else if (i == 0xbf) {
MEMORY_readmap[i] = CARTRIDGE_5200SuperCartGetByte;
MEMORY_writemap[i] = CARTRIDGE_5200SuperCartPutByte;
}
/* else something's wrong, so we keep current values */
}
else {
MEMORY_readmap[i] = NULL;
MEMORY_writemap[i] = MEMORY_ROM_PutByte;
}
break;
case MEMORY_HARDWARE:
switch (i) {
case 0xc0:
case 0xd0:
MEMORY_readmap[i] = GTIA_GetByte;
MEMORY_writemap[i] = GTIA_PutByte;
break;
case 0xd1:
MEMORY_readmap[i] = PBI_D1GetByte;
MEMORY_writemap[i] = PBI_D1PutByte;
break;
case 0xd2:
case 0xe8:
case 0xeb:
MEMORY_readmap[i] = POKEY_GetByte;
MEMORY_writemap[i] = POKEY_PutByte;
break;
case 0xd3:
MEMORY_readmap[i] = PIA_GetByte;
MEMORY_writemap[i] = PIA_PutByte;
break;
case 0xd4:
MEMORY_readmap[i] = ANTIC_GetByte;
MEMORY_writemap[i] = ANTIC_PutByte;
break;
case 0xd5:
MEMORY_readmap[i] = CARTRIDGE_GetByte;
MEMORY_writemap[i] = CARTRIDGE_PutByte;
break;
case 0xd6:
MEMORY_readmap[i] = PBI_D6GetByte;
MEMORY_writemap[i] = PBI_D6PutByte;
break;
case 0xd7:
MEMORY_readmap[i] = PBI_D7GetByte;
MEMORY_writemap[i] = PBI_D7PutByte;
break;
case 0xff:
if (MEMORY_mosaic_num_banks > 0) MEMORY_writemap[0xff] = MosaicPutByte;
break;
case 0xcf:
if (MEMORY_axlon_num_banks > 0) MEMORY_writemap[0xcf] = AxlonPutByte;
break;
case 0x0f:
if (MEMORY_axlon_num_banks > 0 && MEMORY_axlon_0f_mirror) MEMORY_writemap[0x0f] = AxlonPutByte;
break;
default:
/* something's wrong, so we keep current values */
break;
}
break;
default:
/* something's wrong, so we keep current values */
break;
}
}
}
#endif
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
if (SaveVerbose)
StateSav_ReadUBYTE(&MEMORY_basic[0], 8192);
StateSav_ReadUBYTE(&under_cartA0BF[0], 8192);
if (SaveVerbose)
StateSav_ReadUBYTE(&MEMORY_os[0], 16384);
StateSav_ReadUBYTE(&under_atarixl_os[0], 16384);
if (StateVersion >= 7 && SaveVerbose)
StateSav_ReadUBYTE(MEMORY_xegame, 0x2000);
}
if (StateVersion >= 7) {
/* Read amount of XE RAM in 16KB banks. */
StateSav_ReadINT(&num_xe_banks, 1);
/* Compute value of MEMORY_ram_size. */
MEMORY_ram_size = base_ram_kb + num_xe_banks * 16;
if (MEMORY_ram_size == 320) {
/* There are 2 different memory mappings for 320 KB. */
/* In savestate version <= 6 this variable is read in PIA_StateRead. */
int xe_type;
StateSav_ReadINT(&xe_type, 1);
MEMORY_ram_size += xe_type;
}
if (!MEMORY_SizeValid(MEMORY_ram_size)) {
MEMORY_ram_size = 64;
Log_print("Warning: Bad RAM size read in from state save, defaulting to 64 KB");
}
/* Read PORTB and set variables that are based on it. */
StateSav_ReadUBYTE(&portb, 1);
MEMORY_xe_bank = 0;
if (MEMORY_ram_size > 64 && (portb & 0x30) != 0x30) {
switch (MEMORY_ram_size) {
case 128:
MEMORY_xe_bank = ((portb & 0x0c) >> 2) + 1;
break;
case 192:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0x40) >> 2)) >> 2) + 1;
break;
case MEMORY_RAM_320_RAMBO:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0x60) >> 1)) >> 2) + 1;
break;
case MEMORY_RAM_320_COMPY_SHOP:
MEMORY_xe_bank = (((portb & 0x0c) + ((portb & 0xc0) >> 2)) >> 2) + 1;
break;
case 576:
MEMORY_xe_bank = (((portb & 0x0e) + ((portb & 0x60) >> 1)) >> 1) + 1;
break;
case 1088:
MEMORY_xe_bank = (((portb & 0x0e) + ((portb & 0xe0) >> 1)) >> 1) + 1;
break;
}
}
/* In savestate version <= 6 this variable is read in PIA_StateRead. */
MEMORY_selftest_enabled = (portb & 0x81) == 0x01
&& !((portb & 0x30) != 0x30 && MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)
&& !((portb & 0x10) == 0 && MEMORY_ram_size == 1088);
StateSav_ReadINT(&MEMORY_cartA0BF_enabled, 1);
if (Atari800_machine_type == Atari800_MACHINE_XLXE) {
GTIA_TRIG[3] = MEMORY_cartA0BF_enabled;
if (MEMORY_cartA0BF_enabled == 0 && (GTIA_GRACTL & 4))
GTIA_TRIG_latch[3] = 0;
}
}
ANTIC_xe_ptr = NULL;
AllocXEMemory();
if (MEMORY_ram_size > 64) {
StateSav_ReadUBYTE(&atarixe_memory[0], atarixe_memory_size);
/* a hack that makes state files compatible with previous versions:
for 130 XE there's written 192 KB of unused data */
if (MEMORY_ram_size == 128 && StateVersion <= 6) {
UBYTE buffer[256];
int i;
for (i = 0; i < 192 * 4; i++)
StateSav_ReadUBYTE(&buffer[0], 256);
}
if (StateVersion >= 7 && (MEMORY_ram_size == 128 || MEMORY_ram_size == MEMORY_RAM_320_COMPY_SHOP)) {