mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-09 12:25:16 +01:00
779 lines
16 KiB
C
779 lines
16 KiB
C
#include "shared.h"
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static uint16 next_int = 1;
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static uint8 prot_bytes[2]; /* simple protection faking (from Picodrive) */
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unsigned int m68k_read_bus_8(unsigned int address)
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{
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uint16 temp = m68k_read_bus_16(address);
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return ((address & 1) ? (temp & 0xFF) : (temp >> 8));
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}
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unsigned int m68k_read_bus_16(unsigned int address)
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{
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next_int ^= 0xFFFF;
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return next_int;
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}
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void m68k_unused_w (unsigned int address, unsigned int value)
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{
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error("Unused 3 %08X = %08X \n", address, value);
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}
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void m68k_unused_8_w (unsigned int address, unsigned int value)
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{
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error("Unused 2 %08X = %02X \n", address, value);
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}
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void m68k_unused_16_w (unsigned int address, unsigned int value)
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{
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error("Unused 1 %08X = %04X \n", address, value);
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}
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/*
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Functions to handle memory accesses which cause the Genesis to halt
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either temporarily (press RESET button to restart) or unrecoverably
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(cycle power to restart).
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*/
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void m68k_lockup_w_8 (unsigned int address, unsigned int value)
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{
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error ("Lockup %08X = %02X (%08X)\n", address, value, m68k_get_reg (NULL, M68K_REG_PC));
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gen_running = 0;
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m68k_end_timeslice ();
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}
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void m68k_lockup_w_16 (unsigned int address, unsigned int value)
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{
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error ("Lockup %08X = %04X (%08X)\n", address, value, m68k_get_reg (NULL, M68K_REG_PC));
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gen_running = 0;
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m68k_end_timeslice ();
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}
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unsigned int m68k_lockup_r_8 (unsigned int address)
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{
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error ("Lockup %08X.b (%08X)\n", address, m68k_get_reg (NULL, M68K_REG_PC));
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gen_running = 0;
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m68k_end_timeslice ();
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return -1;
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}
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unsigned int m68k_lockup_r_16 (unsigned int address)
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{
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error ("Lockup %08X.w (%08X)\n", address, m68k_get_reg (NULL, M68K_REG_PC));
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gen_running = 0;
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m68k_end_timeslice ();
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return -1;
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}
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/*--------------------------------------------------------------------------*/
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/* 68000 memory handlers */
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/*--------------------------------------------------------------------------*/
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unsigned int m68k_read_memory_8 (unsigned int address)
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{
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switch ((address >> 21) & 7)
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{
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case 0: /* ROM Cartridge*/
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case 1:
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/* SRAM */
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if (sram.on)
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{
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if (address >= sram.start && address <= sram.end)
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{
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if (sram.custom) return (EEPROM_Read(address)&0xffff);
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return READ_BYTE(sram.sram, (address - sram.start) & 0xffff);
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}
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}
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/* ROM data */
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if (address < genromsize) return READ_BYTE(cart_rom, address);
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/* default */
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return 0x00;
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case 7: /* RAM */
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return READ_BYTE(work_ram, address & 0xFFFF);
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case 5: /* Z80 & I/O */
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if (address <= 0xA0FFFF) /* Z80 area */
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{
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/* Z80 controls Z bus */
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if (zbusack == 1) return (m68k_read_bus_8 (address));
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else
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{
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/* Read data from Z bus */
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switch (address & 0x6000)
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{
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case 0x0000: /* RAM */
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case 0x2000:
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return (zram[(address & 0x1FFF)]);
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case 0x4000: /* YM2612 */
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return (fm_read (address & 3));
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case 0x6000: /* Unused */
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switch (address & 0xFF00)
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{
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case 0x7F00: /* VDP */
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m68k_lockup_r_8 (address);
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default: /* Unused */
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return (0xFF);
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}
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break;
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}
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}
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}
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else if (address <= 0xA1001F)
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{
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/* I/O */
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return (io_read((address >> 1) & 0x0F));
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}
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else if (address <= 0xA1FFFF) /* CONTROL */
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{
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switch ((address >> 8) & 0xFF)
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{
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case 0x11: /* BUSACK */
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if ((address & 1) == 0) return (gen_busack_r () | (m68k_read_bus_8 (address) & 0xFE));
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else return (m68k_read_bus_8 (address));
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case 0x00: /* UNKNOWN (BallZ) */
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case 0x10: /* MEMORY MODE */
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case 0x12: /* RESET */
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case 0x20: /* MEGA-CD */
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case 0x40: /* TMSS */
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case 0x41: /* BOOTROM */
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case 0x50: /* SVP REGISTERS */
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case 0x30: /* TIME */
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return (m68k_read_bus_8 (address));
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default: /* Unused */
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return (m68k_lockup_r_8 (address));
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}
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}
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else
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{
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/* Unused */
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return (m68k_lockup_r_8 (address));
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}
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break;
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case 6: /* VDP */
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if ((address & 0xE700E0) == 0xC00000)
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{
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switch (address & 0x1F)
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{
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case 0x00: /* DATA */
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case 0x02:
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return (vdp_data_r () >> 8);
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case 0x01: /* DATA */
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case 0x03:
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return (vdp_data_r () & 0xFF);
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case 0x04: /* CTRL */
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case 0x06:
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return ((m68k_read_bus_8 (address) & 0xFC) | (vdp_ctrl_r () >> 8));
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case 0x05: /* CTRL */
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case 0x07:
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return (vdp_ctrl_r () & 0xFF);
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case 0x08: /* HVC */
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case 0x0A:
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case 0x0C:
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case 0x0E:
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return (vdp_hvc_r () >> 8);
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case 0x09: /* HVC */
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case 0x0B:
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case 0x0D:
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case 0x0F:
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return (vdp_hvc_r () & 0xFF);
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case 0x10: /* PSG */
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x17:
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return (m68k_lockup_r_8 (address));
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case 0x18: /* Unused */
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case 0x19:
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case 0x1A:
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case 0x1B:
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case 0x1C:
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case 0x1D:
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case 0x1E:
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case 0x1F:
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return (m68k_read_bus_8 (address));
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}
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}
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else
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{
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/* Unused */
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return (m68k_lockup_r_8 (address));
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}
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break;
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case 2: /* Unused */
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/* Some unlicensed games have a simple protection device mapped here */
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return prot_bytes[(address>>2)&1];
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case 3: /* Unused */
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return (m68k_read_bus_8 (address));
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case 4: /* Unused */
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return (m68k_lockup_r_8 (address));
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}
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return -1;
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}
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unsigned int m68k_read_memory_16 (unsigned int address)
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{
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switch ((address >> 21) & 7)
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{
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case 0: /* ROM Cartridge */
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case 1:
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/* SRAM */
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if (sram.on)
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{
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if (address >= sram.start && address <= sram.end)
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{
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if (sram.custom) return (EEPROM_Read(address) & 0xffff);
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return *(uint16 *)(sram.sram + ((address - sram.start) & 0xffff));
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}
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}
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/* ROM Data */
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if (address < genromsize) return *(uint16 *)(cart_rom + address);
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/* j-CART */
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if (j_cart && ((address == 0x3FFFFE) || (address == 0x38FFFE)))
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return (gamepad_read(5) | (gamepad_read(6) << 8));
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/* Virtua Racing SVP */
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if (address == 0x30fe02) return 0x01;
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/* default */
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return 0x00;
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case 7: /* RAM */
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return *(uint16 *)(work_ram + (address & 0xffff));
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case 5: /* Z80 & I/O */
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if (address <= 0xA0FFFF) /* Z80 area */
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{
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if (zbusack == 1) return (m68k_read_bus_16 (address));
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else
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{
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uint8 temp;
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switch (address & 0x6000)
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{
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case 0x0000: /* RAM */
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case 0x2000:
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temp = zram[address & 0x1FFF];
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return (temp << 8 | temp);
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case 0x4000: /* YM2612 */
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temp = fm_read (address & 3);
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return (temp << 8 | temp);
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case 0x6000:
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switch (address & 0xFF00)
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{
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case 0x7F00: /* VDP */
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m68k_lockup_r_16 (address);
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default: /* Unused */
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return (0xFFFF);
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}
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break;
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}
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}
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}
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else if (address <= 0xA1001F) /* I/O */
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{
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uint8 temp = io_read ((address >> 1) & 0x0F);
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return (temp << 8 | temp);
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}
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else if (address <= 0xA1FFFF) /* CONTROL */
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{
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switch ((address >> 8) & 0xFF)
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{
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case 0x11: /* BUSACK */
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return ((m68k_read_bus_16 (address) & 0xFEFF) | (gen_busack_r () << 8));
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case 0x00: /* UNKNOWN (BallZ) */
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case 0x10: /* MEMORY MODE */
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case 0x12: /* RESET */
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case 0x20: /* MEGA-CD */
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case 0x40: /* TMSS */
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case 0x41: /* BOOTROM */
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case 0x50: /* SVP REGISTERS */
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case 0x30: /* TIME */
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return (m68k_read_bus_16 (address));
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default: /* Unused */
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return (m68k_lockup_r_16 (address));
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}
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}
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else
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{
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/* Unused */
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return (m68k_lockup_r_16 (address));
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}
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break;
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case 6: /* VDP */
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if ((address & 0xE700E0) == 0xC00000)
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{
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switch (address & 0x1F)
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{
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case 0x00: /* DATA */
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case 0x02:
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return (vdp_data_r ());
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case 0x04: /* CTRL */
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case 0x06:
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return (vdp_ctrl_r () | (m68k_read_bus_16 (address) & 0xFC00));
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case 0x08: /* HVC */
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case 0x0A:
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case 0x0C:
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case 0x0E:
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return (vdp_hvc_r ());
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case 0x10: /* PSG */
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case 0x12:
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case 0x14:
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case 0x16:
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return (m68k_lockup_r_16 (address));
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case 0x18: /* Unused */
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case 0x1A:
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case 0x1C:
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case 0x1E:
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return (m68k_read_bus_16 (address));
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}
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}
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else
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{
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return (m68k_lockup_r_16 (address));
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}
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break;
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case 2:
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case 3:
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return (m68k_read_bus_16 (address));
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case 4:
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return (m68k_lockup_r_16 (address));
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}
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return (0xA5A5);
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}
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unsigned int m68k_read_memory_32 (unsigned int address)
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{
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/* Split into 2 reads */
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return (m68k_read_memory_16 (address + 0) << 16 |
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m68k_read_memory_16 (address + 2));
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}
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void m68k_write_memory_8 (unsigned int address, unsigned int value)
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{
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switch ((address >> 21) & 7)
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{
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case 7: /* RAM */
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WRITE_BYTE(work_ram, address & 0xFFFF, value);
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return;
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case 6: /* VDP */
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if ((address & 0xE700E0) == 0xC00000)
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{
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switch (address & 0x1F)
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{
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case 0x00: /* DATA */
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case 0x01:
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case 0x02:
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case 0x03:
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vdp_data_w (value << 8 | value);
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return;
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case 0x04: /* CTRL */
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case 0x05:
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case 0x06:
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case 0x07:
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vdp_ctrl_w (value << 8 | value);
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return;
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case 0x08: /* HVC */
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case 0x09:
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case 0x0A:
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case 0x0B:
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case 0x0C:
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case 0x0D:
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case 0x0E:
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case 0x0F:
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m68k_lockup_w_8 (address, value);
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return;
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case 0x10: /* PSG */
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case 0x12:
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case 0x14:
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case 0x16:
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m68k_unused_8_w (address, value);
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return;
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case 0x11: /* PSG */
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case 0x13:
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case 0x15:
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case 0x17:
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psg_write (value);
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return;
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case 0x18: /* Unused */
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case 0x19:
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case 0x1A:
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case 0x1B:
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case 0x1C:
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case 0x1D:
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case 0x1E:
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case 0x1F:
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m68k_unused_8_w (address, value);
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return;
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}
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}
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else
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{
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m68k_lockup_w_8 (address, value);
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return;
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}
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case 5: /* Z80 & IO */
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if (address <= 0xA0FFFF) /* Z80 area */
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{
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if (zbusack == 1)
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{
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m68k_unused_8_w (address, value);
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return;
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}
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else
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{
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switch (address & 0x6000)
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{
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case 0x0000:
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case 0x2000:
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zram[(address & 0x1FFF)] = value;
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return;
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case 0x4000:
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fm_write (address & 3, value);
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return;
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case 0x6000:
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switch (address & 0xFF00)
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{
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case 0x6000: /* BANK */
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gen_bank_w (value & 1);
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return;
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case 0x7F00: /* VDP */
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m68k_lockup_w_8 (address, value);
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return;
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default: /* Unused */
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m68k_unused_8_w (address, value);
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return;
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}
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break;
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}
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}
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}
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else if (address <= 0xA1001F) /* I/O */
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{
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/* I/O chip only gets /LWR */
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if (address & 1) io_write ((address >> 1) & 0x0F, value);
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return;
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}
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else if (address <= 0xA1FFFF) /* CONTROL */
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{
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switch ((address >> 8) & 0xFF)
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{
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case 0x11: /* BUSREQ */
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if ((address & 1) == 0) gen_busreq_w (value & 1);
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else m68k_unused_8_w (address, value);
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return;
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case 0x12: /* RESET */
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gen_reset_w (value & 1);
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return;
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case 0x30: /* TIME */
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if (SSF2TNC) ssf2bankrom (address, value & 0xf); /* banked ROM */
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else if (address == 0xA130F1) /* banked SRAM */
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{
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sram.on = value & 1;
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sram.write = (value & 2) ? 0 : 1;
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}
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else m68k_unused_8_w (address, value);
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return;
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case 0x10: /* MEMORY MODE */
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case 0x20: /* MEGA-CD */
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case 0x40: /* TMSS */
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case 0x41: /* BOOTROM */
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case 0x50: /* SVP REGISTERS */
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m68k_unused_8_w (address, value);
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return;
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default:
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m68k_lockup_w_8 (address, value);
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return;
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}
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}
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else
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{
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/* Unused */
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m68k_lockup_w_8 (address, value);
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return;
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}
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break;
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case 0: /* ROM Cartridge */
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case 1:
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/* external SRAM */
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if (sram.on && sram.write)
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{
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if (address >= sram.start && address <= sram.end)
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{
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/* serial EEPROM */
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if (sram.custom)
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{
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EEPROM_Write(address, value);
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return;
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}
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/* normal SRAM */
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WRITE_BYTE(sram.sram, (address - sram.start) & 0xffff, value & 0xff);
|
|
return;
|
|
}
|
|
}
|
|
m68k_unused_8_w (address, value);
|
|
return;
|
|
|
|
case 2: /* Unused */
|
|
/* Some unlicensed games have a simple protection device mapped here */
|
|
prot_bytes[(address>>2)&1] = value;
|
|
return;
|
|
case 3:
|
|
m68k_unused_8_w (address, value);
|
|
return;
|
|
|
|
case 4: /* Unused */
|
|
m68k_lockup_w_8 (address, value);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
void m68k_write_memory_16 (unsigned int address, unsigned int value)
|
|
{
|
|
switch ((address >> 21) & 7)
|
|
{
|
|
case 7: /* Work RAM */
|
|
*(uint16 *)(work_ram + (address& 0xFFFF)) = value & 0xffff;
|
|
return;
|
|
|
|
case 6: /* VDP */
|
|
if ((address & 0xE700E0) == 0xC00000)
|
|
{
|
|
switch (address & 0x1C)
|
|
{
|
|
case 0x00: /* DATA */
|
|
vdp_data_w (value);
|
|
return;
|
|
|
|
case 0x04: /* CTRL */
|
|
vdp_ctrl_w (value);
|
|
return;
|
|
|
|
case 0x08: /* HV counter */
|
|
case 0x0C: /* HV counter */
|
|
m68k_lockup_w_16 (address, value);
|
|
return;
|
|
|
|
case 0x10: /* PSG */
|
|
case 0x14: /* PSG */
|
|
psg_write (value & 0xFF);
|
|
return;
|
|
|
|
case 0x18: /* Unused */
|
|
case 0x1C: /* Unused */
|
|
m68k_unused_8_w (address, value);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Invalid address */
|
|
m68k_lockup_w_16 (address, value);
|
|
}
|
|
break;
|
|
|
|
case 5: /* Z80 area, I/O chip, miscellaneous. */
|
|
if (address <= 0xA0FFFF) /* Z80 area */
|
|
{
|
|
/* Writes are ignored when the Z80 hogs the Z-bus */
|
|
if (zbusack == 1)
|
|
{
|
|
m68k_unused_8_w (address, value);
|
|
return;
|
|
}
|
|
|
|
/* Write into Z80 address space */
|
|
switch (address & 0x6000)
|
|
{
|
|
case 0x0000: /* Work RAM */
|
|
case 0x2000: /* Work RAM */
|
|
zram[(address & 0x1FFF)] = (value >> 8) & 0xFF;
|
|
return;
|
|
|
|
case 0x4000: /* YM2612 */
|
|
fm_write (address & 3, (value >> 8) & 0xFF);
|
|
return;
|
|
|
|
case 0x6000: /* Bank register and VDP */
|
|
switch (address & 0x7F00)
|
|
{
|
|
case 0x6000: /* Bank register */
|
|
gen_bank_w ((value >> 8) & 1);
|
|
return;
|
|
|
|
case 0x7F00: /* VDP registers */
|
|
m68k_lockup_w_16 (address, value);
|
|
return;
|
|
|
|
default: /* Unused */
|
|
m68k_unused_8_w (address, value);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else if (address <= 0xA1001F) /* I/O */
|
|
{
|
|
io_write ((address >> 1) & 0x0F, value & 0x00FF);
|
|
return;
|
|
}
|
|
else if (address <= 0xA1FFFF) /* CONTROL */
|
|
{
|
|
switch ((address >> 8) & 0xFF)
|
|
{
|
|
case 0x11: /* BUSREQ */
|
|
gen_busreq_w ((value >> 8) & 1);
|
|
return;
|
|
|
|
case 0x12: /* RESET */
|
|
gen_reset_w ((value >> 8) & 1);
|
|
return;
|
|
|
|
case 0x30: /* TIME */
|
|
if (SSF2TNC) ssf2bankrom (address, value & 0xf); /* banked ROM */
|
|
else if (address == 0xA130F1) /* banked SRAM */
|
|
{
|
|
sram.on = value & 1;
|
|
sram.write = (value & 2) ? 0 : 1;
|
|
}
|
|
else m68k_unused_16_w (address, value);
|
|
return;
|
|
|
|
case 0x10: /* MEMORY MODE */
|
|
case 0x20: /* MEGA-CD */
|
|
case 0x40: /* TMSS */
|
|
case 0x41: /* BOOTROM */
|
|
case 0x50: /* SVP REGISTERS */
|
|
m68k_unused_16_w (address, value);
|
|
return;
|
|
|
|
default: /* Unused */
|
|
m68k_lockup_w_16 (address, value);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m68k_lockup_w_16 (address, value);
|
|
return;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0: /* Cartridge ROM */
|
|
case 1:
|
|
/* J-CART extension (TH signal) */
|
|
if ((address == 0x3FFFFE) || (address == 0x38FFFE))
|
|
{
|
|
if (!j_cart)
|
|
{
|
|
j_cart = 1;
|
|
input_reset(pad_type);
|
|
}
|
|
gamepad_write(5, (value&1) <<6 );
|
|
gamepad_write(6, (value&1) <<6);
|
|
return;
|
|
}
|
|
|
|
/* external SRAM */
|
|
if (sram.on && sram.write)
|
|
{
|
|
if (address >= sram.start && address <= sram.end)
|
|
{
|
|
/* serial EEPROM */
|
|
if (sram.custom)
|
|
{
|
|
EEPROM_Write(address, value);
|
|
return;
|
|
}
|
|
|
|
/* normal SRAM */
|
|
*(uint16 *)(sram.sram + ((address - sram.start) & 0xffff)) = value & 0xffff;
|
|
return;
|
|
}
|
|
}
|
|
m68k_unused_16_w (address, value);
|
|
return;
|
|
|
|
case 2: /* Unused */
|
|
case 3:
|
|
m68k_unused_16_w (address, value);
|
|
return;
|
|
|
|
case 4: /* Unused */
|
|
m68k_lockup_w_16 (address, value);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
void m68k_write_memory_32 (unsigned int address, unsigned int value)
|
|
{
|
|
/* Split into 2 writes */
|
|
m68k_write_memory_16 (address, (value >> 16) & 0xFFFF);
|
|
m68k_write_memory_16 (address + 2, value & 0xFFFF);
|
|
}
|