src/c64dtv/c64dtvmem.c

/*
 * c64dtvmem.c -- C64DTV memory handling.
 *
 * Written by
 *  M.Kiesel <mayne@users.sourceforge.net>
 *  Hannu Nuotio <hannu.nuotio@tut.fi>
 *  Daniel Kahlin <daniel@kahlin.net>
 * Based on code by
 *  Andreas Boose <viceteam@t-online.de>
 *  Ettore Perazzoli <ettore@comm2000.it>
 *  Marco van den Heuvel <blackystardust68@yahoo.com>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  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.
 *
 */

#include "vice.h"

#include "c64dtvmem.h"
#include "c64dtvblitter.h"
#include "c64dtvcpu.h"
#include "c64dtvdma.h"
#include "c64dtvflash.h"
#include "cia.h"
#include "cmdline.h"
#include "debugcart.h"
#include "lib.h"
#include "log.h"
#include "util.h"
#include "resources.h"
#include "mos6510dtv.h"
#include "interrupt.h"
#include "alarm.h"
#include "hummeradc.h"
#include "ps2mouse.h"

/* TODO this is a hack */
#define C64_RAM_SIZE 0x200000

#ifndef C64DTV
#define C64DTV
#endif

/* start of c64dtvmem_main.c */

#include "vice.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "c64.h"
#include "c64-resources.h"
#include "c64cia.h"
#include "c64mem.h"
#include "c64dtvmeminit.h"
#include "c64memrom.h"
#include "c64pla.h"
#include "machine.h"
#include "maincpu.h"
#include "mem.h"
#include "monitor.h"
#include "ram.h"
#include "sid.h"
#include "vicii-mem.h"
#include "vicii-phi1.h"
#include "vicii.h"
#include "viciitypes.h"

/* #define DBGMEM */

#ifdef DBGMEM
#define DBG(x) log_message(c64dtvmem_log, x);
#else
#define DBG(x)
#endif

/* C64 memory-related resources.  */

/* ------------------------------------------------------------------------- */

/* Number of possible memory configurations.  */
#define NUM_CONFIGS     8
/* Number of possible video banks (16K each).  */
#define NUM_VBANKS      4

/* The C64 memory, see ../mem.h.  */
uint8_t mem_ram[C64_RAM_SIZE];

#ifdef USE_EMBEDDED
#include "c64chargen.h"
#else
uint8_t mem_chargen_rom[C64_CHARGEN_ROM_SIZE];
#endif

/* Internal color memory.  */
uint8_t *mem_color_ram_cpu;
uint8_t *mem_color_ram_vicii; /* unused; needed by vicii-fetch.c */

/* Pointer to the chargen ROM.  */
uint8_t *mem_chargen_rom_ptr;

/* Pointers to the currently used memory read and write tables.  */
read_func_ptr_t *_mem_read_tab_ptr;
store_func_ptr_t *_mem_write_tab_ptr;
static uint8_t **_mem_read_base_tab_ptr;
static uint32_t *mem_read_limit_tab_ptr;

/* Memory read and write tables.  */
static store_func_ptr_t mem_write_tab[NUM_VBANKS][NUM_CONFIGS][0x101];
static read_func_ptr_t mem_read_tab[NUM_CONFIGS][0x101];
static uint8_t *mem_read_base_tab[NUM_CONFIGS][0x101];
static uint32_t mem_read_limit_tab[NUM_CONFIGS][0x101];

static store_func_ptr_t mem_write_tab_watch[0x101];
static read_func_ptr_t mem_read_tab_watch[0x101];

/* Current video bank (0, 1, 2 or 3).  */
static int vbank;

/* Current memory configuration.  */
static int mem_config;

/* Current watchpoint state. 1 = watchpoints active, 0 = no watchpoints */
static int watchpoints_active;

/* ------------------------------------------------------------------------- */

static uint8_t zero_read_watch(uint16_t addr)
{
    addr &= 0xff;
    monitor_watch_push_load_addr(addr, e_comp_space);
    return mem_read_tab[mem_config][0](addr);
}

static void zero_store_watch(uint16_t addr, uint8_t value)
{
    addr &= 0xff;
    monitor_watch_push_store_addr(addr, e_comp_space);
    mem_write_tab[vbank][mem_config][0](addr, value);
}

static uint8_t read_watch(uint16_t addr)
{
    monitor_watch_push_load_addr(addr, e_comp_space);
    return mem_read_tab[mem_config][addr >> 8](addr);
}

static void store_watch(uint16_t addr, uint8_t value)
{
    monitor_watch_push_store_addr(addr, e_comp_space);
    mem_write_tab[vbank][mem_config][addr >> 8](addr, value);
}

void mem_toggle_watchpoints(int flag, void *context)
{
    if (flag) {
        _mem_read_tab_ptr = mem_read_tab_watch;
        _mem_write_tab_ptr = mem_write_tab_watch;
    } else {
        _mem_read_tab_ptr = mem_read_tab[mem_config];
        _mem_write_tab_ptr = mem_write_tab[vbank][mem_config];
    }
    watchpoints_active = flag;
}

/* ------------------------------------------------------------------------- */

void mem_pla_config_changed(void)
{
    mem_config = (((~pport.dir | pport.data) & 0x7));

    c64pla_config_changed(0, 0, 0, 1, 0x17);

    if (watchpoints_active) {
        _mem_read_tab_ptr = mem_read_tab_watch;
        _mem_write_tab_ptr = mem_write_tab_watch;
    } else {
        _mem_read_tab_ptr = mem_read_tab[mem_config];
        _mem_write_tab_ptr = mem_write_tab[vbank][mem_config];
    }

    _mem_read_base_tab_ptr = mem_read_base_tab[mem_config];
    mem_read_limit_tab_ptr = mem_read_limit_tab[mem_config];

    maincpu_resync_limits();
}

uint8_t zero_read(uint16_t addr)
{
    addr &= 0xff;

    switch ((uint8_t)addr) {
        case 0:
            return pport.dir_read;
        case 1:
            return pport.data_read;
    }

    return mem_ram[addr & 0xff];
}

void zero_store(uint16_t addr, uint8_t value)
{
    addr &= 0xff;

    switch ((uint8_t)addr) {
        case 0:
            if (vbank == 0) {
                vicii_mem_vbank_store((uint16_t)0, vicii_read_phi1_lowlevel());
            } else {
                mem_ram[0] = vicii_read_phi1_lowlevel();
                machine_handle_pending_alarms(maincpu_rmw_flag + 1);
            }
            if (pport.dir != value) {
                pport.dir = value;
                mem_pla_config_changed();
            }
            break;
        case 1:
            if (vbank == 0) {
                vicii_mem_vbank_store((uint16_t)1, vicii_read_phi1_lowlevel());
            } else {
                mem_ram[1] = vicii_read_phi1_lowlevel();
                machine_handle_pending_alarms(maincpu_rmw_flag + 1);
            }
            if (pport.data != value) {
                pport.data = value;
                mem_pla_config_changed();
            }
            break;
        default:
            if (vbank == 0) {
                vicii_mem_vbank_store(addr, value);
            } else {
                mem_ram[addr] = value;
            }
    }
}

/* ------------------------------------------------------------------------- */

uint8_t chargen_read(uint16_t addr)
{
    return c64dtvflash_read(addr);
}

/*void chargen_store(uint16_t addr, uint8_t value)
{
    return;
}*/

uint8_t ram_read(uint16_t addr)
{
    return mem_ram[addr];
}

void ram_store(uint16_t addr, uint8_t value)
{
    mem_ram[addr] = value;
}

void ram_hi_store(uint16_t addr, uint8_t value)
{
    if (vbank == 3) {
        vicii_mem_vbank_3fxx_store(addr, value);
    } else {
        mem_ram[addr] = value;
    }
}

/* ------------------------------------------------------------------------- */

void mem_set_write_hook(int config, int page, store_func_t *f)
{
    int i;

    for (i = 0; i < NUM_VBANKS; i++) {
        mem_write_tab[i][config][page] = f;
    }
}

void mem_read_tab_set(unsigned int base, unsigned int index,
                      read_func_ptr_t read_func)
{
    mem_read_tab[base][index] = read_func;
}

void mem_read_base_set(unsigned int base, unsigned int index, uint8_t *mem_ptr)
{
    mem_read_base_tab[base][index] = mem_ptr;
}

void mem_initialize_memory(void)
{
    int i, j, k;

    mem_chargen_rom_ptr = &c64dtvflash_mem[0x1000]; /* FIXME: 1000 or 9000 based on vicii bank */
    mem_color_ram_cpu = &mem_ram[0x01d800];
    mem_color_ram_vicii = NULL;

    /* setup watchpoint tables */
    mem_read_tab_watch[0] = zero_read_watch;
    mem_write_tab_watch[0] = zero_store_watch;
    for (i = 1; i <= 0x100; i++) {
        mem_read_tab_watch[i] = read_watch;
        mem_write_tab_watch[i] = store_watch;
    }

    /* Default is RAM.  */
    for (i = 0; i < NUM_CONFIGS; i++) {
        mem_set_write_hook(i, 0, zero_store);
        mem_read_tab[i][0] = zero_read;
        mem_read_base_tab[i][0] = mem_ram;
        for (j = 1; j <= 0xfe; j++) {
            mem_read_tab[i][j] = ram_read;
            mem_read_base_tab[i][j] = mem_ram + (j << 8);
            for (k = 0; k < NUM_VBANKS; k++) {
                if ((j & 0xc0) == (k << 6)) {
                    switch (j & 0x3f) {
                        case 0x39:
                            mem_write_tab[k][i][j] = vicii_mem_vbank_39xx_store;
                            break;
                        case 0x3f:
                            mem_write_tab[k][i][j] = vicii_mem_vbank_3fxx_store;
                            break;
                        default:
                            mem_write_tab[k][i][j] = vicii_mem_vbank_store;
                    }
                } else {
                    mem_write_tab[k][i][j] = ram_store;
                }
            }
        }
        mem_read_tab[i][0xff] = ram_read;
        mem_read_base_tab[i][0xff] = mem_ram + 0xff00;

        /* vbank access is handled within `ram_hi_store()'.  */
        mem_set_write_hook(i, 0xff, ram_hi_store);
    }

    /* Setup character generator ROM at $D000-$DFFF (memory configs 1, 2,
       3).  */
    for (i = 0xd0; i <= 0xdf; i++) {
        mem_read_tab[1][i] = chargen_read;
        mem_read_tab[2][i] = chargen_read;
        mem_read_tab[3][i] = chargen_read;
        mem_read_base_tab[1][i] = NULL;
        mem_read_base_tab[2][i] = NULL;
        mem_read_base_tab[3][i] = NULL;
    }

    c64dtvmeminit(0);
    c64dtvmem_limit_init(mem_read_limit_tab);

    for (i = 0; i < NUM_CONFIGS; i++) {
        mem_read_tab[i][0x100] = mem_read_tab[i][0];
        for (j = 0; j < NUM_VBANKS; j++) {
            mem_write_tab[j][i][0x100] = mem_write_tab[j][i][0];
        }
        mem_read_base_tab[i][0x100] = mem_read_base_tab[i][0];
    }

    _mem_read_tab_ptr = mem_read_tab[7];
    _mem_write_tab_ptr = mem_write_tab[vbank][7];
    _mem_read_base_tab_ptr = mem_read_base_tab[7];
    mem_read_limit_tab_ptr = mem_read_limit_tab[7];

    vicii_set_chargen_addr_options(0x7000, 0x1000);

    c64pla_pport_reset();

    /* Setup initial memory configuration.  */
    mem_pla_config_changed();
    c64dtvmem_init_config();
}

void mem_mmu_translate(unsigned int addr, uint8_t **base, int *start, int *limit)
{
#ifdef FEATURE_CPUMEMHISTORY
    *base = NULL;
    *start = addr;
    *limit = 0;
#else
    int bank = addr >> 14;
    int paddr;
    uint8_t *p;
    uint32_t limits;

    if ((((dtv_registers[8] >> (bank * 2)) & 0x03) == 0x00)) {
        if (c64dtvflash_state) {
            *base = NULL; /* not idle */
            *limit = 0;
            *start = 0;
            return;
        }
        paddr = (((int)dtv_registers[12 + bank]) << 14) & (C64_RAM_SIZE - 1);
        *base = &c64dtvflash_mem[paddr] - (addr & 0xc000);
        *limit = (addr & 0xc000) | 0x3ffd;
        *start = addr & 0xc000;
        return;
    }
    paddr = (((int)dtv_registers[12 + bank]) << 14) & (C64_RAM_SIZE - 1);
    if (paddr < 0x10000) {
        paddr |= addr & 0x3fff;
        p = _mem_read_base_tab_ptr[paddr >> 8];
        if (p) { /* easy */
            if (addr > 1) {
                *base = p - (addr & 0xff00);
                limits = mem_read_limit_tab_ptr[paddr >> 8];
                *limit = (limits & 0xffff) - paddr + addr;
                *start = (limits >> 16) - paddr + addr;
            } else {
                *base = NULL;
                *limit = 0;
                *start = 0;
            }
            return;
        } else {
            if (!c64dtvflash_state) {
                read_func_ptr_t ptr = _mem_read_tab_ptr[paddr >> 8];
                if (ptr == c64memrom_kernal64_read) {
                    int mapping = c64dtvmem_memmapper[0];
                    paddr = ((mapping & 0x1f) << 16) + (paddr & ~0x3fff) - (addr & 0xc000);
                    *base = ((mapping & 0xc0) ? mem_ram : c64dtvflash_mem) + paddr;
                    *limit = (addr & 0xe000) | 0x1ffd;
                    *start = addr & 0xe000;
                    return;
                }
                if (ptr == c64memrom_basic64_read) {
                    int mapping = c64dtvmem_memmapper[1];
                    paddr = ((mapping & 0x1f) << 16) + (paddr & ~0x3fff) - (addr & 0xc000);
                    *base = ((mapping & 0xc0) ? mem_ram : c64dtvflash_mem) + paddr;
                    *limit = (addr & 0xe000) | 0x1ffd;
                    *start = addr & 0xe000;
                    return;
                }
                if (ptr == chargen_read) { /* not likely but anyway */
                    *base = c64dtvflash_mem + (paddr & ~0x3fff) - (addr & 0xc000);
                    *limit = (addr & 0xf000) | 0x0ffd;
                    *start = addr & 0xf000;
                    return;
                }
            }
            *base = NULL;
            *limit = 0;
            *start = 0;
        }
    } else {
        *base = &mem_ram[paddr] - (addr & 0xc000);
        *limit = (addr & 0xc000) | 0x3ffd;
        *start = addr & 0xc000;
    }
#endif
}

/* ------------------------------------------------------------------------- */

/* Initialize RAM for power-up.  */
void mem_powerup(void)
{
    ram_init(mem_ram, C64_RAM_SIZE);
}

/* ------------------------------------------------------------------------- */

/* Change the current video bank.  Call this routine only when the vbank
   has really changed.  */
void mem_set_vbank(int new_vbank)
{
    vbank = new_vbank;
    _mem_write_tab_ptr = mem_write_tab[new_vbank][mem_config];
    vicii_set_vbank(new_vbank);
}

/* ------------------------------------------------------------------------- */

/* FIXME: this part needs to be checked.  */

void mem_get_basic_text(uint16_t *start, uint16_t *end)
{
    if (start != NULL) {
        *start = mem_ram[0x2b] | (mem_ram[0x2c] << 8);
    }
    if (end != NULL) {
        *end = mem_ram[0x2d] | (mem_ram[0x2e] << 8);
    }
}

void mem_set_basic_text(uint16_t start, uint16_t end)
{
    mem_ram[0x2b] = mem_ram[0xac] = start & 0xff;
    mem_ram[0x2c] = mem_ram[0xad] = start >> 8;
    mem_ram[0x2d] = mem_ram[0x2f] = mem_ram[0x31] = mem_ram[0xae] = end & 0xff;
    mem_ram[0x2e] = mem_ram[0x30] = mem_ram[0x32] = mem_ram[0xaf] = end >> 8;
}

void mem_inject(uint32_t addr, uint8_t value)
{
    mem_ram[addr & 0x1fffff] = value;
}

/* ------------------------------------------------------------------------- */

int mem_rom_trap_allowed(uint16_t addr)
{
    if (addr >= 0xe000) {
        switch (mem_config) {
            case 2:
            case 3:
            case 6:
            case 7:
                return 1;
            default:
                return 0;
        }
    }

    return 0;
}

/* ------------------------------------------------------------------------- */

/* Banked memory access functions for the monitor.  */

/* FIXME: peek, cartridge support */

void store_bank_io(uint16_t addr, uint8_t byte)
{
    switch (addr & 0xff00) {
        case 0xd000:
        case 0xd100:
        case 0xd200:
        case 0xd300:
            vicii_store(addr, byte);
            break;
        case 0xd400:
        case 0xd500:
        case 0xd600:
        case 0xd700:
            sid_store(addr, byte);
            debugcart_store(addr, byte);
            break;
        case 0xd800:
        case 0xd900:
        case 0xda00:
        case 0xdb00:
            colorram_store(addr, byte);
            break;
        case 0xdc00:
            cia1_store(addr, byte);
            break;
        case 0xdd00:
            cia2_store(addr, byte);
            break;
        case 0xde00:
            c64io1_store(addr, byte);
            break;
        case 0xdf00:
            c64io2_store(addr, byte);
            break;
    }
    return;
}

uint8_t read_bank_io(uint16_t addr)
{
    switch (addr & 0xff00) {
        case 0xd000:
        case 0xd100:
        case 0xd200:
        case 0xd300:
            return vicii_read(addr);
        case 0xd400:
        case 0xd500:
        case 0xd600:
        case 0xd700:
            return sid_read(addr);
        case 0xd800:
        case 0xd900:
        case 0xda00:
        case 0xdb00:
            return colorram_read(addr);
        case 0xdc00:
            return cia1_read(addr);
        case 0xdd00:
            return cia2_read(addr);
        case 0xde00:
            return c64io1_read(addr);
        case 0xdf00:
            return c64io2_read(addr);
    }
    return 0xff;
}

static uint8_t peek_bank_io(uint16_t addr)
{
    switch (addr & 0xff00) {
        case 0xd000:
        case 0xd100:
        case 0xd200:
        case 0xd300:
            return vicii_peek(addr);
        case 0xd400:
        case 0xd500:
        case 0xd600:
        case 0xd700:
            return sid_read(addr);
        case 0xd800:
        case 0xd900:
        case 0xda00:
        case 0xdb00:
            return colorram_read(addr);
        case 0xdc00:
            return cia1_peek(addr);
        case 0xdd00:
            return cia2_peek(addr);
        case 0xde00:
            return c64io1_read(addr); /* FIXME */
        case 0xdf00:
            return c64io2_read(addr); /* FIXME */
    }
    return 0xff;
}

/* ------------------------------------------------------------------------- */

/* Exported banked memory access functions for the monitor.  */

static int mem_dump_io(void *context, uint16_t addr)
{
    if ((addr >= 0xd000) && (addr <= 0xd04f)) {
        return vicii_dump();
    } else if ((addr >= 0xd400) && (addr <= 0xd41f)) {
        /* return sidcore_dump(machine_context.sid); */ /* FIXME */
    } else if ((addr >= 0xdc00) && (addr <= 0xdc3f)) {
        return ciacore_dump(machine_context.cia1);
    } else if ((addr >= 0xdd00) && (addr <= 0xdd3f)) {
        return ciacore_dump(machine_context.cia2);
    }
    return -1;
}

mem_ioreg_list_t *mem_ioreg_list_get(void *context)
{
    mem_ioreg_list_t *mem_ioreg_list = NULL;

    mon_ioreg_add_list(&mem_ioreg_list, "VIC-II", 0xd000, 0xd04f, mem_dump_io, NULL);
    /* TODO blitter, DMA... */
    mon_ioreg_add_list(&mem_ioreg_list, "SID", 0xd400, 0xd41f, mem_dump_io, NULL);
    mon_ioreg_add_list(&mem_ioreg_list, "CIA1", 0xdc00, 0xdc0f, mem_dump_io, NULL);
    mon_ioreg_add_list(&mem_ioreg_list, "CIA2", 0xdd00, 0xdd0f, mem_dump_io, NULL);

    return mem_ioreg_list;
}

void mem_get_screen_parameter(uint16_t *base, uint8_t *rows, uint8_t *columns, int *bank)
{
    *base = ((vicii_peek(0xd018) & 0xf0) << 6)
            | ((~cia2_peek(0xdd00) & 0x03) << 14);
    *rows = 25;
    *columns = 40;
    *bank = 0;
}

/* end of c64dtvmem_main.c */

static log_t c64dtvmem_log = LOG_ERR;

/* I/O of the memory mapper ($D100/$D101) */
uint8_t c64dtvmem_memmapper[0x2];

/* The memory banking mechanism/virtual memory is visible to the CPU only. */
/* VICII, DMA Engine, Blitter have access to physical memory. */
/* Kernal/Basic ROM is visible in physical memory only since DTV address */
/* translation is done before determining access type (C64 MMU). */
/* Note that zeropage/stack mapping (reg10/11) is done before this - */
/* see c64dtvcpu. */

static inline int addr_to_paddr(uint16_t addr)
{
    int bank = addr >> 14;
    /* DTV register 12-15 - Remap 16k memory banks */
    return ((((int) dtv_registers[12 + bank]) << 14) + (addr & 0x3fff)) & (C64_RAM_SIZE - 1);
}

static inline int access_rom(uint16_t addr)
{
    int bank = addr >> 14;
    return(((dtv_registers[8] >> (bank * 2)) & 0x03) == 0x00);
    /* TODO 00 is ROM, 01 is RAM, what about 10 and 11? */
}

/* ------------------------------------------------------------------------- */
/* Replacements for c64mem.c code */

void mem_store(uint16_t addr, uint8_t value)
{
#ifdef FEATURE_CPUMEMHISTORY
    store_func_ptr_t rptr;
#endif

    int paddr = addr_to_paddr(addr);
/* if (addr != paddr) printf("Store to adress %x mapped to %x - %d %d %d %d\n", addr, paddr, dtv_registers[12], dtv_registers[13], dtv_registers[14], dtv_registers[15]); */ /* DEBUG */
    if (access_rom(addr)) {
#ifdef FEATURE_CPUMEMHISTORY
        monitor_memmap_store(paddr, MEMMAP_ROM_W);
#endif
        c64dtvflash_store(paddr, value);
        return;
    }
    if (paddr <= 0xffff) {
#ifdef FEATURE_CPUMEMHISTORY
        rptr = _mem_write_tab_ptr[paddr >> 8];
        if ((rptr == ram_store)
            || (rptr == ram_hi_store)
            || (rptr == vicii_mem_vbank_store)
            || (rptr == zero_store)) {
            monitor_memmap_store(paddr, MEMMAP_RAM_W);
        } else {
            monitor_memmap_store(paddr, MEMMAP_I_O_W);
        }
#endif
        /* disable dummy write if skip cycle */
        if (dtv_registers[9] & 1) {
            maincpu_rmw_flag = 0;
        }
        _mem_write_tab_ptr[paddr >> 8]((uint16_t)paddr, value);
    } else {
#ifdef FEATURE_CPUMEMHISTORY
        monitor_memmap_store(paddr, MEMMAP_RAM_W);
#endif
        mem_ram[paddr] = value;
    }
}

uint8_t mem_read(uint16_t addr)
{
#ifdef FEATURE_CPUMEMHISTORY
    read_func_ptr_t rptr;
#endif

    int paddr = addr_to_paddr(addr);
/* if (addr != paddr) printf("Read from adress %x mapped to %x - %d %d %d %d\n", addr, paddr, dtv_registers[12], dtv_registers[13], dtv_registers[14], dtv_registers[15]); */ /* DEBUG */
    if (access_rom(addr)) {
#ifdef FEATURE_CPUMEMHISTORY
        monitor_memmap_store(paddr, (memmap_state & MEMMAP_STATE_OPCODE) ? MEMMAP_ROM_X : (memmap_state & MEMMAP_STATE_INSTR) ? 0 : MEMMAP_ROM_R);
        memmap_state &= ~(MEMMAP_STATE_OPCODE);
#endif
        return c64dtvflash_read(paddr);
    }
    if (paddr <= 0xffff) {
#ifdef FEATURE_CPUMEMHISTORY
        rptr = _mem_read_tab_ptr[paddr >> 8];
        if ((rptr == ram_read)
            || (rptr == zero_read)) {
            monitor_memmap_store(paddr, (memmap_state & MEMMAP_STATE_OPCODE) ? MEMMAP_RAM_X : (memmap_state & MEMMAP_STATE_INSTR) ? 0 : MEMMAP_RAM_R);
        } else if ((rptr == c64memrom_basic64_read)
                   || (rptr == c64memrom_kernal64_read)) {
            monitor_memmap_store(paddr, (memmap_state & MEMMAP_STATE_OPCODE) ? MEMMAP_ROM_X : (memmap_state & MEMMAP_STATE_INSTR) ? 0 : MEMMAP_ROM_R);
        } else {
            monitor_memmap_store(paddr, MEMMAP_I_O_R);
        }
        memmap_state &= ~(MEMMAP_STATE_OPCODE);
#endif
        return _mem_read_tab_ptr[paddr >> 8]((uint16_t)paddr);
    } else {
#ifdef FEATURE_CPUMEMHISTORY
        monitor_memmap_store(paddr, (memmap_state & MEMMAP_STATE_OPCODE) ? MEMMAP_RAM_X : (memmap_state & MEMMAP_STATE_INSTR) ? 0 : MEMMAP_RAM_R);
        memmap_state &= ~(MEMMAP_STATE_OPCODE);
#endif
        return mem_ram[paddr];
    }
}

void colorram_store(uint16_t addr, uint8_t value)
{
    mem_color_ram_cpu[addr & 0x3ff] = value;
}

uint8_t colorram_read(uint16_t addr)
{
    return mem_color_ram_cpu[addr & 0x3ff];
}


/* ------------------------------------------------------------------------- */

void c64dtv_init(void)
{
    int trapfl;
    if (c64dtvmem_log == LOG_ERR) {
        c64dtvmem_log = log_open("C64DTVMEM");
    }

    hummeradc_init();
    c64dtvblitter_init();
    c64dtvdma_init();
    c64dtvflash_init();
    DBG("installing floppy traps");
    /* TODO disable copying by command line parameter */
    /* Make sure serial code traps are in place.  */
    resources_get_int("VirtualDevices", &trapfl);
    resources_set_int("VirtualDevices", 0);
    resources_set_int("VirtualDevices", trapfl);
    /* TODO chargen ROM support */

    DBG("END init");
}

/* init C64DTV memory table changes */
void c64dtvmem_init_config(void)
{
    int i, j, k;

    /* install DMA engine handlers */
    DBG("install mem_read/mem_write handlers");
    for (i = 0; i < NUM_CONFIGS; i++)
    {
        for (j = 1; j <= 0xff; j++)
        {
            for (k = 0; k < NUM_VBANKS; k++)
            {
                if (mem_write_tab[k][i][j] == vicii_store && j == 0xd3) {
                    mem_write_tab[k][i][j] = c64dtv_dmablit_store;
                }
                if (mem_write_tab[k][i][j] == vicii_store && j == 0xd1) {
                    mem_write_tab[k][i][j] = c64dtv_mapper_store;
                }
                if (mem_write_tab[k][i][j] == vicii_store && j == 0xd2) {
                    mem_write_tab[k][i][j] = c64dtv_palette_store;
                }
            }
            if (mem_read_tab[i][j] == vicii_read && j == 0xd3) {
                mem_read_tab[i][j] = c64dtv_dmablit_read;
            }
            if (mem_read_tab[i][j] == vicii_read && j == 0xd1) {
                mem_read_tab[i][j] = c64dtv_mapper_read;
            }
            if (mem_read_tab[i][j] == vicii_read && j == 0xd2) {
                mem_read_tab[i][j] = c64dtv_palette_read;
            }
        }
    }
    DBG("END init_config");
}


void c64dtvmem_shutdown(void)
{
    int trapfl;

    hummeradc_shutdown();
    c64dtvblitter_shutdown();
    c64dtvdma_shutdown();
    /* work around for non transparent kernal traps.
       Disable serial traps when shutting down c64dtvflash, which
       saves the contents if enabled */
    resources_get_int("VirtualDevices", &trapfl);
    resources_set_int("VirtualDevices", 0);
    c64dtvflash_shutdown();
    resources_set_int("VirtualDevices", trapfl);

    DBG("END shutdown");
}

void c64dtvmem_reset(void)
{
    int trapfl;
    DBG("reset");

    /* Disable serial traps when resetting mem mapper */
    resources_get_int("VirtualDevices", &trapfl);
    resources_set_int("VirtualDevices", 0);
    c64dtvmem_memmapper[0x00] = 0; /* KERNAL ROM segment (0x10000 byte segments) */
    c64dtvmem_memmapper[0x01] = 0; /* BASIC ROM segment (0x10000 byte segments) */
    resources_set_int("VirtualDevices", trapfl);

    /* TODO move register file initialization somewhere else? */
    dtv_registers[8] = 0x55; /* RAM/ROM access mode */
    dtv_registers[9] = 0; /* skip cycle and burst mode */
    dtv_registers[10] = 0; /* zero page (0x100 byte segments) */
    dtv_registers[11] = 1; /* stack page (0x100 byte segments) */
    dtv_registers[12] = 0; /* bank 0 (0x4000 byte segments) */
    dtv_registers[13] = 1; /* bank 1 */
    dtv_registers[14] = 2; /* bank 2 */
    dtv_registers[15] = 3; /* bank 3 */
    ps2mouse_reset();
    hummeradc_reset();
    c64dtvblitter_reset();
    c64dtvdma_reset();
    c64dtvflash_reset();
}

/* ------------------------------------------------------------------------- */

/* These are the $D100/$D101 memory mapper register handlers */

uint8_t c64dtv_mapper_read(uint16_t addr)
{
    if (!vicii_extended_regs()) {
        return vicii_read(addr);
    }

    return mem_ram[addr];
}

void c64dtv_mapper_store(uint16_t addr, uint8_t value)
{
    int trapfl;
    if (!vicii_extended_regs()) {
        vicii_store(addr, value);
        return;
    }

    /* always write through to $d100 (this is a hardware bug) */
    mem_ram[addr] = value;

    /* handle aliasing */
    addr &= 0x0f;

    /* DBG("Wrote %d to %x", value, addr); */

    switch (addr) {
        case 0x00:
            /* Deinstall serial traps, change KERNAL segment, reinstall traps */
            resources_get_int("VirtualDevices", &trapfl);
            resources_set_int("VirtualDevices", 0);
            c64dtvmem_memmapper[0] = value;
            maincpu_resync_limits();
            resources_set_int("VirtualDevices", trapfl);
            if (trapfl) {
                log_message(c64dtvmem_log, "Changed KERNAL segment - disable VirtualDevices if you encounter problems");
            }
            break;
        case 0x01:
            c64dtvmem_memmapper[1] = value;
            maincpu_resync_limits();
            break;
        default:
            break;
    }
}


uint8_t c64io1_read(uint16_t addr)
{
    return 0x00;
}

void c64io1_store(uint16_t addr, uint8_t value)
{
}

uint8_t c64io2_read(uint16_t addr)
{
    return 0x00;
}

void c64io2_store(uint16_t addr, uint8_t value)
{
}

/* ------------------------------------------------------------------------- */

/* These are the $D200 palette register handlers */

uint8_t c64dtv_palette_read(uint16_t addr)
{
    if (!vicii_extended_regs()) {
        return vicii_read(addr);
    }

    return vicii_palette_read(addr);
}

void c64dtv_palette_store(uint16_t addr, uint8_t value)
{
    if (!vicii_extended_regs()) {
        vicii_store(addr, value);
        return;
    }

    vicii_palette_store(addr, value);
    return;
}


/* ------------------------------------------------------------------------- */

/* These are the $D300 DMA and blitter register handlers */

uint8_t c64dtv_dmablit_read(uint16_t addr)
{
    if (!vicii_extended_regs()) {
        return vicii_read(addr);
    }

    addr &= 0x3f;

    if (addr & 0x20) {
        return c64dtv_blitter_read((uint16_t)(addr & 0x1f));
    } else {
        return c64dtv_dma_read(addr);
    }
}

void c64dtv_dmablit_store(uint16_t addr, uint8_t value)
{
    if (!vicii_extended_regs()) {
        vicii_store(addr, value);
        return;
    }

    addr &= 0x3f;

    if (addr & 0x20) {
        c64dtv_blitter_store((uint16_t)(addr & 0x1f), value);
    } else {
        c64dtv_dma_store(addr, value);
    }
}


/* ------------------------------------------------------------------------- */

/* Exported banked memory access functions for the monitor.  */

static const char *banknames[] =
{
    "default", "cpu", "ram", "rom", "io", "cart",
    "ram00", "ram01", "ram02", "ram03", "ram04", "ram05", "ram06", "ram07",
    "ram08", "ram09", "ram0a", "ram0b", "ram0c", "ram0d", "ram0e", "ram0f",
    "ram10", "ram11", "ram12", "ram13", "ram14", "ram15", "ram16", "ram17",
    "ram18", "ram19", "ram1a", "ram1b", "ram1c", "ram1d", "ram1e", "ram1f",
    "rom00", "rom01", "rom02", "rom03", "rom04", "rom05", "rom06", "rom07",
    "rom08", "rom09", "rom0a", "rom0b", "rom0c", "rom0d", "rom0e", "rom0f",
    "rom10", "rom11", "rom12", "rom13", "rom14", "rom15", "rom16", "rom17",
    "rom18", "rom19", "rom1a", "rom1b", "rom1c", "rom1d", "rom1e", "rom1f",
    NULL
};

static const int banknums[] =
{
    1, 0, 1, 2, 3, 4,
    5, 6, 7, 8, 9, 10, 11, 12,
    13, 14, 15, 16, 17, 18, 19, 20,
    21, 22, 23, 24, 25, 26, 27, 28,
    29, 30, 31, 32, 33, 34, 35, 36,
    37, 38, 39, 40, 41, 42, 43, 44,
    45, 46, 47, 48, 49, 50, 51, 52,
    53, 54, 55, 56, 57, 58, 59, 60,
    61, 62, 63, 64, 65, 66, 67, 68
};

const char **mem_bank_list(void)
{
    return banknames;
}

int mem_bank_from_name(const char *name)
{
    int i = 0;

    while (banknames[i]) {
        if (!strcmp(name, banknames[i])) {
            return banknums[i];
        }
        i++;
    }
    return -1;
}

uint8_t mem_bank_read(int bank, uint16_t addr, void *context)
{
    int paddr;

    if ((bank >= 5) && (bank <= 36)) {
        return mem_ram[((bank - 5) << 16) + addr]; /* ram00..1f */
    }
    if ((bank >= 37) && (bank <= 68)) {
        return c64dtvflash_mem[((bank - 37) << 16) + addr]; /* rom00..1f */
    }

    /* TODO: is restoring r8, r10..15 needed? */
    dtv_registers[8] = MOS6510DTV_REGS_GET_R8(&maincpu_regs);
    dtv_registers[10] = MOS6510DTV_REGS_GET_R10(&maincpu_regs);
    dtv_registers[11] = MOS6510DTV_REGS_GET_R11(&maincpu_regs);
    dtv_registers[12] = MOS6510DTV_REGS_GET_R12(&maincpu_regs);
    dtv_registers[13] = MOS6510DTV_REGS_GET_R13(&maincpu_regs);
    dtv_registers[14] = MOS6510DTV_REGS_GET_R14(&maincpu_regs);
    dtv_registers[15] = MOS6510DTV_REGS_GET_R15(&maincpu_regs);

    paddr = addr_to_paddr(addr);
    switch (bank) {
        case 0:                 /* current */
            return mem_read(addr);
        case 3:                 /* io */
            if (paddr >= 0xd000 && paddr < 0xe000) {
                return read_bank_io((uint16_t)paddr);
            }
        case 4:                 /* cart */
            break;
        case 2:                 /* rom */
            if (paddr >= 0xa000 && paddr <= 0xbfff) {
                return c64memrom_basic64_read((uint16_t)paddr);
            }
            if (paddr >= 0xd000 && paddr <= 0xdfff) {
                return chargen_read((uint16_t)paddr);
            }
            if (paddr >= 0xe000) {
                return c64memrom_kernal64_read((uint16_t)paddr);
            }
        case 1:                 /* ram */
            break; /* yes, this could be flash as well */
    }
    return access_rom(addr) ? c64dtvflash_read(paddr) : mem_ram[paddr];
}


uint8_t mem_bank_peek(int bank, uint16_t addr, void *context)
{
    int paddr;
    if (bank >= 5) {
        return mem_bank_read(bank, addr, context);
    }

    /* TODO: is restoring r8, r10..15 needed? */
    dtv_registers[8] = MOS6510DTV_REGS_GET_R8(&maincpu_regs);
    dtv_registers[10] = MOS6510DTV_REGS_GET_R10(&maincpu_regs);
    dtv_registers[11] = MOS6510DTV_REGS_GET_R11(&maincpu_regs);
    dtv_registers[12] = MOS6510DTV_REGS_GET_R12(&maincpu_regs);
    dtv_registers[13] = MOS6510DTV_REGS_GET_R13(&maincpu_regs);
    dtv_registers[14] = MOS6510DTV_REGS_GET_R14(&maincpu_regs);
    dtv_registers[15] = MOS6510DTV_REGS_GET_R15(&maincpu_regs);

    paddr = addr_to_paddr(addr);
    switch (bank) {
        case 0:                 /* current */
            if (access_rom(addr)) {
                return c64dtvflash_mem[paddr];
            }
            if (paddr <= 0xffff) {
                if (c64dtvmeminit_io_config[mem_config]) {
                    if ((paddr >= 0xd000) && (paddr < 0xe000)) {
                        return peek_bank_io((uint16_t)paddr);
                    }
                }
                if (_mem_read_tab_ptr[paddr >> 8] == c64memrom_basic64_read) {
                    int mapping = c64dtvmem_memmapper[1];
                    paddr |= (mapping & 0x1f) << 16;
                    return (mapping & 0xc0) ? mem_ram[paddr] : c64dtvflash_mem[paddr];
                }
                if (_mem_read_tab_ptr[paddr >> 8] == chargen_read) {
                    return c64dtvflash_mem[paddr];
                }
                if (_mem_read_tab_ptr[paddr >> 8] == c64memrom_kernal64_read) {
                    int mapping = c64dtvmem_memmapper[0];
                    paddr |= (mapping & 0x1f) << 16;
                    return (mapping & 0xc0) ? mem_ram[paddr] : c64dtvflash_mem[paddr];
                } /* no side effects on the rest */
                return _mem_read_tab_ptr[paddr >> 8]((uint16_t)paddr);
            }
            return mem_ram[paddr];
        case 3:                 /* io */
            if (paddr >= 0xd000 && paddr < 0xe000) {
                return peek_bank_io((uint16_t)paddr);
            }
        case 4:                 /* cart */
            break;
        case 2:                 /* rom */
            if (paddr >= 0xa000 && paddr <= 0xbfff) {
                int mapping = c64dtvmem_memmapper[1];
                paddr += ((mapping & 0x1f) << 16);
                return ((mapping >> 6) == 0) ? c64dtvflash_mem[paddr] : mem_ram[paddr];
            }
            if (paddr >= 0xd000 && paddr <= 0xdfff) {
                return c64dtvflash_mem[paddr];
            }
            if (paddr >= 0xe000) {
                int mapping = c64dtvmem_memmapper[0];
                paddr += ((mapping & 0x1f) << 16);
                return ((mapping >> 6) == 0) ? c64dtvflash_mem[paddr] : mem_ram[paddr];
            }
        case 1:                 /* ram */
            break; /* yes, this could be flash as well */
    }
    return access_rom(addr) ? c64dtvflash_mem[paddr] : mem_ram[paddr];
}

void mem_bank_write(int bank, uint16_t addr, uint8_t byte, void *context)
{
    int paddr;

    if ((bank >= 5) && (bank <= 36)) { /* ram00..1f */
        mem_ram[((bank - 5) << 16) + addr] = byte;
        return;
    }

    if ((bank >= 37) && (bank <= 68)) {
        c64dtvflash_mem[((bank - 37) << 16) + addr] = byte; /* rom00..1f */
        return;
    }

    /* TODO: is restoring r8, r10..15 needed? */
    dtv_registers[8] = MOS6510DTV_REGS_GET_R8(&maincpu_regs);
    dtv_registers[10] = MOS6510DTV_REGS_GET_R10(&maincpu_regs);
    dtv_registers[11] = MOS6510DTV_REGS_GET_R11(&maincpu_regs);
    dtv_registers[12] = MOS6510DTV_REGS_GET_R12(&maincpu_regs);
    dtv_registers[13] = MOS6510DTV_REGS_GET_R13(&maincpu_regs);
    dtv_registers[14] = MOS6510DTV_REGS_GET_R14(&maincpu_regs);
    dtv_registers[15] = MOS6510DTV_REGS_GET_R15(&maincpu_regs);

    paddr = addr_to_paddr(addr);
    switch (bank) {
        case 0:                 /* current */
            mem_store(addr, byte);
            return;
        case 3:                 /* io */
            if (paddr >= 0xd000 && paddr < 0xe000) {
                store_bank_io((uint16_t)paddr, byte);
                return;
            }
        case 4:                 /* cart */
            break;
        case 2:                 /* rom */
            if (paddr >= 0xa000 && paddr <= 0xbfff) {
                return;
            }
            if (paddr >= 0xd000 && paddr <= 0xdfff) {
                return;
            }
            if (paddr >= 0xe000) {
                return;
            }
        case 1:                 /* ram */
            break; /* yes, this could be flash as well */
    }
    if (access_rom(addr)) {
        c64dtvflash_mem[paddr] = byte;
    } else {
        mem_ram[paddr] = byte;
    }
}

/* ------------------------------------------------------------------------- */

int c64dtvmem_resources_init(void)
{
    return c64dtvblitter_resources_init() < 0 ||
           c64dtvdma_resources_init() < 0 ||
           c64dtvflash_resources_init() < 0;
}

void c64dtvmem_resources_shutdown(void)
{
    c64dtvblitter_resources_shutdown();
    c64dtvdma_resources_shutdown();
    c64dtvflash_resources_shutdown();
}


int c64dtvmem_cmdline_options_init(void)
{
    return c64dtvblitter_cmdline_options_init() < 0 ||
           c64dtvdma_cmdline_options_init() < 0 ||
           c64dtvflash_cmdline_options_init() < 0;
}