602 lines
14 KiB
C
602 lines
14 KiB
C
/*
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* NewOswan
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* memory.c: Memory implementatoion
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* Based on the original Oswan-unix
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* Copyright (c) 2014-2021 986-Studio. All rights reserved.
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*
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*/
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////////////////////////////////////////////////////////////////////////////////
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// Notes: need to optimize cpu_writemem20
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//
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//
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//
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//
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//
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//////////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "ws.h"
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#include "log.h"
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#include "rom.h"
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#include "./nec/nec.h"
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#include "io.h"
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#include "gpu.h"
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#include "audio.h"
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#include "memory.h"
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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#define IO_ROM_BANK_BASE_SELECTOR 0xC0
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uint8_t *ws_rom;
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uint8_t *ws_staticRam;
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uint8_t *internalRam;
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uint8_t *externalEeprom;
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char *internalBWIRom;
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char *internalColorIRom;
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char *internalCrystalIRom;
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char *internalBWEeprom;
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char *internalColorEeprom;
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char *internalCrystalEeprom;
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uint16_t *internalEeprom;
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extern uint8_t *ws_ioRam;
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uint16_t ws_rom_checksum;
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uint8_t ws_haveCrystalIRom;
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uint8_t ws_haveColorIRom;
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uint8_t ws_haveBWIRom;
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uint32_t sramAddressMask;
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uint32_t externalEepromAddressMask;
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uint32_t romAddressMask;
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uint32_t romSize;
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extern nec_Regs I;
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void dump_memory()
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{
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int i;
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FILE *fp;
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printf("Dumping memory....\n");
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fp = fopen("iram.bin", "wb");
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fwrite(internalRam, 1, 0x10000, fp);
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fclose(fp);
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fp = fopen("sram.bin", "wb");
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fwrite(ws_staticRam, 1, 0x10000, fp);
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fclose(fp);
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fp = fopen("rom.bin", "wb");
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fwrite(ws_rom, 1, romSize, fp);
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fclose(fp);
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fp = fopen("memorydump.bin", "wb");
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fwrite(internalRam, 1, 0x10000, fp);
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/* page 1 */
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fwrite(&(ws_staticRam[0 & sramAddressMask]), 1, 0x10000, fp);
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fwrite(&(ws_rom[((ws_ioRam[IO_ROM_BANK_BASE_SELECTOR + 2] & ((romSize >> 16) - 1)) << 16)]), 1, 0x10000, fp);
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fwrite(&(ws_rom[((ws_ioRam[IO_ROM_BANK_BASE_SELECTOR + 3] & ((romSize >> 16) - 1)) << 16)]), 1, 0x10000, fp);
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for (i = 4 ; i < 0x10 ; i++)
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{
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int romBank = (256 - (((ws_ioRam[IO_ROM_BANK_BASE_SELECTOR] & 0xf) << 4) | (i & 0xf)));
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fwrite(&(ws_rom[(unsigned)(romSize - (romBank << 16))]), 1, 0x10000, fp);
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}
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fclose(fp);
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fp = fopen("registers.bin", "wb");
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fwrite(ws_ioRam, 1, 256, fp);
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fclose(fp);
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fp = fopen("cpuregs.bin", "wb");
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/* CS */
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fwrite(&I.sregs[CS], 1, 2, fp);
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/* IP */
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fwrite(&I.ip, 1, 2, fp);
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fclose(fp);
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}
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#ifndef USE_PAGED_MEMORY_ACCESS
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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void cpu_writemem20(uint32_t addr, uint8_t value)
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{
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uint32_t offset = addr & 0xffff;
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uint32_t bank = addr >> 16;
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if (!bank)
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{
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// 0 - RAM - 16 KB (WS) / 64 KB (WSC) internal RAM
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ws_gpu_write_byte(offset, value);
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ws_audio_write_byte(offset, value);
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}
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else if (bank == 1)
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{
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// 1 - SRAM (cart)
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ws_staticRam[offset & sramAddressMask] = value;
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}
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// other banks are read-only
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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uint8_t cpu_readmem20(uint32_t addr)
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{
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uint32_t offset = addr & 0xffff;
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uint32_t bank = addr >> 16;
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//uint16_t romBank;
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uint8_t hwReg;
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uint32_t temp;
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uint8_t ret;
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wssystem_t currentSystem = ws_get_system();
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switch (bank)
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{
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case 0:
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/*
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* So the original WonderSwan, and Color/Crystal in B&W mode have 16KB of IRAM Mapped.
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* Color/Crystal in color mode have 64 KB IRAM mapped.
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*/
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if (ws_gpu_operatingInColor)
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{
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return (internalRam[offset]);
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}
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else if (offset < 0x4000)
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{
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return (internalRam[offset]);
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}
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return (0x90);
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case 1: // 1 - SRAM (cart)
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return ws_staticRam[offset & sramAddressMask];
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case 2:
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// Bank 2
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hwReg = ws_ioRam[0xC2];
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temp = hwReg << 16;
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temp += offset;
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temp &= (romSize - 1);
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return ws_rom[temp];
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case 3:
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// Bank 3
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hwReg = ws_ioRam[0xC3];
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temp = hwReg << 16;
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temp += offset;
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temp &= (romSize - 1);
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return ws_rom[temp];
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case 0xF:
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hwReg = ws_ioRam[0xA0];
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if (!(hwReg & 1))
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{
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if (currentSystem == WS_SYSTEM_COLOR && ws_haveColorIRom)
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{
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if (addr >= 0xFE000)
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{
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ret = internalColorIRom[addr & ~0xFE000];
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return ret;
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}
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}
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else if (currentSystem == WS_SYSTEM_CRYSTAL && ws_haveColorIRom)
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{
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if (addr >= 0xFE000)
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{
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ret = internalCrystalIRom[addr & ~0xFE000];
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return ret;
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}
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}
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else if (currentSystem == WS_SYSTEM_MONO && ws_haveBWIRom)
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{
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if (addr >= 0xFF000)
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{
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ret = internalBWIRom[addr & ~0xFF000];
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return ret;
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}
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}
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}
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// fall through
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default:
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hwReg = ws_ioRam[0xC0];
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temp = hwReg << 20;
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temp += addr & 0xFFFFF;
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temp &= (romSize - 1);
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return ws_rom[temp];
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}
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return (0x90);
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}
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#else
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/* 256 page of 12 bits */
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uint8_t *pagedMemory[0x100];
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/* Memory address is 20bit and split in 8 (page) - 12 (offset) */
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void cpu_writemem20(uint32_t addr, uint8_t value)
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{
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uint8_t page = addr >> 12;
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uint16_t offset = addr & 0xFFF;
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if (page < 0x30)
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{
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/* Unmapped will be NULL so just check to be sure */
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if (pagedMemory[page])
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{
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pagedMemory[page][offset] = value;
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}
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}
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}
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uint8_t cpu_readmem20(uint32_t addr)
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{
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uint8_t page = addr >> 12;
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uint16_t offset = addr & 0xFFF;
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if (pagedMemory[page])
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{
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return pagedMemory[page][offset];
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}
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return 0x90;
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}
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/* Set memory bank with a granularity of 4-16 as it is the most common on the WonderSwan */
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void set_memory_bank(uint8_t bank, uint8_t *pointer)
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{
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uint8_t page = bank << 4;
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for(int i = 0; i < 16; i++)
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{
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pagedMemory[page | i] = pointer + (i * 0x1000);
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}
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}
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void set_memory_page(uint8_t page, uint8_t *pointer)
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{
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pagedMemory[page] = pointer;
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}
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void set_irom_overlay()
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{
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/* Setup the boot rom */
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if (ws_get_system() == WS_SYSTEM_MONO)
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{
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set_memory_page(0xFF, internalBWIRom);
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}
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else if (ws_get_system() == WS_SYSTEM_COLOR)
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{
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set_memory_page(0xFE, internalColorIRom);
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set_memory_page(0xFF, internalColorIRom + 0x1000);
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}
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else if (ws_get_system() == WS_SYSTEM_CRYSTAL)
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{
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set_memory_page(0xFE, internalCrystalIRom);
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set_memory_page(0xFF, internalCrystalIRom + 0x1000);
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}
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}
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uint8_t *getRom(uint32_t *size)
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{
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*size = romSize;
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return ws_rom;
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}
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uint8_t *getSram(uint32_t *size)
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{
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*size = sramSize;
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return ws_staticRam;
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}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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char *load_file(char *filename)
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{
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int fd;
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char *ret_ptr;
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struct stat FileStat;
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fd = open(filename, O_RDWR);
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fstat(fd, &FileStat);
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Log(TLOG_DEBUG, "memory", "Trying to load %s, size = %lu...", filename, (unsigned long)FileStat.st_size);
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ret_ptr = (char *)mmap(NULL, FileStat.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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if (ret_ptr == MAP_FAILED)
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{
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ret_ptr = NULL;
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}
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return ret_ptr;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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char *create_file(char *filename, uint32_t size)
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{
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int fd;
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uint32_t i;
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char *ret_ptr;
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char buf[] = {0};
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Log(TLOG_DEBUG, "memory", "Trying to create %s, size = %u...\n", filename, size);
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fd = open(filename, O_CREAT | S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH | O_TRUNC, 0644);
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fchmod(fd, 0644);
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close(fd);
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sync();
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fd = open(filename, O_RDWR);
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for (i = 0 ; i < size ; i++)
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{
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write(fd, buf, 1);
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}
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close(fd);
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sync();
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fd = open(filename, O_RDWR);
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ret_ptr = (char *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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if (ret_ptr == MAP_FAILED)
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{
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ret_ptr = NULL;
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}
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return ret_ptr;
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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void ws_memory_init(uint8_t *rom, uint32_t wsRomSize)
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{
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ws_romHeaderStruct *ws_romHeader;
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ws_rom = rom;
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romSize = wsRomSize;
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ws_romHeader = ws_rom_getHeader(ws_rom, romSize);
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ws_rom_checksum = ws_romHeader->checksum;
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internalRam = (uint8_t *)malloc(0x10000);
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sramAddressMask = ws_rom_sramSize(ws_rom, romSize) - 1;
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externalEepromAddressMask = ws_rom_eepromSize(ws_rom, romSize) - 1;
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internalBWIRom = load_file("ws_irom.bin");
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internalColorIRom = load_file("wsc_irom.bin");
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internalCrystalIRom = load_file("wc_irom.bin");
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internalBWEeprom = load_file("ws_ieeprom.bin");
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if (internalBWEeprom == NULL)
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{
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internalBWEeprom = create_file("ws_ieeprom.bin", BW_IEEPROM_SIZE);
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}
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internalColorEeprom = load_file("wsc_ieeprom.bin");
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if (internalColorEeprom == NULL)
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{
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internalColorEeprom = create_file("wsc_ieeprom.bin", COLOR_IEEPROM_SIZE);
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}
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internalCrystalEeprom = load_file("wc_ieeprom.bin");
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if (internalCrystalEeprom == NULL)
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{
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internalCrystalEeprom = create_file("wc_ieeprom.bin", COLOR_IEEPROM_SIZE);
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}
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internalEeprom = (uint16_t *)internalBWEeprom;
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if (ws_get_system() == WS_SYSTEM_COLOR)
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{
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internalEeprom = (uint16_t *)internalColorEeprom;
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}
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else if (ws_get_system() == WS_SYSTEM_CRYSTAL)
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{
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internalEeprom = (uint16_t *)internalCrystalEeprom;
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}
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ws_haveBWIRom = false;
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ws_haveColorIRom = false;
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ws_haveCrystalIRom = false;
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if (internalColorIRom != NULL)
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{
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Log(TLOG_DEBUG, "memory", "B&W IROM Found!");
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ws_haveColorIRom = true;
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}
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if (internalBWIRom != NULL)
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{
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Log(TLOG_DEBUG, "memory", "Color IROM Found!");
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ws_haveBWIRom = true;
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}
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if (internalCrystalIRom != NULL)
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{
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Log(TLOG_DEBUG, "memory", "Crystal IROM Found!");
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ws_haveCrystalIRom = true;
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}
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romAddressMask = romSize - 1;
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#ifdef USE_PAGED_MEMORY_ACCESS
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for(int i = 0; i < 0x100; i++)
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{
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pagedMemory[i] = NULL;
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}
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/* IRAM */
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set_memory_bank(0, internalRam);
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for(int i = 0x4; i < 0x10; i++)
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{
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set_memory_page(i, NULL);
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}
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/* Cart SRAM */
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if (sramSize > 0)
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{
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set_memory_bank(0x1, ws_get_page_ptr(ws_staticRam, sramSize, 0xFF));
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}
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set_memory_bank(0x2, ws_get_page_ptr(ws_rom, romSize, 0xFF));
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set_memory_bank(0x3, ws_get_page_ptr(ws_rom, romSize, 0xFF));
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for(int i = 0x04; i < 0x10; i++)
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{
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set_memory_bank(i, ws_get_page_ptr(ws_rom, romSize, 0xF0 + i));
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}
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set_irom_overlay();
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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void ws_memory_reset(void)
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{
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memset(internalRam, 0, 0x10000);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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void ws_memory_done(void)
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{
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free(internalRam);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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uint8_t *memory_getRom(void)
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{
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return (ws_rom);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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uint32_t memory_getRomSize(void)
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{
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return (romSize);
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}
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////////////////////////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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//
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//
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//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
uint16_t memory_getRomCrc(void)
|
|
{
|
|
return (ws_rom_checksum);
|
|
}
|