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Steve2/src/cpu/6502.c
Tamas Rudnai 1d7c47e630 Merged from Fake Scroller
2024-01-06 07:11:52 -08:00

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//
// main.c
// 6502
//
// Created by Tamas Rudnai on 7/14/19.
// Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
//
// This file is part of Steve ][ -- The Apple ][ Emulator.
//
// Steve ][ 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 3 of the License, or
// (at your option) any later version.
//
// Steve ][ 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 Steve ][. If not, see <https://www.gnu.org/licenses/>.
//
// Documentations:
//
// http://nesdev.com/6502_cpu.txt
// http://www.oxyron.de/html/opcodes02.html
// https://macgui.com/kb/article/46
// https://www.masswerk.at/6502/6502_instruction_set.html
//
#define CLK_WAIT
#undef DEBUGGER
#undef DISASSEMBLER
#define FETCH_ADDR m6502.PC
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include "6502.h"
#include "6502_bp.h"
#include "6502_dbg.h"
#include "speaker.h"
void ViewController_spk_up_play(void);
void ViewController_spk_dn_play(void);
volatile cpuMode_s cpuMode = cpuMode_normal;
volatile cpuState_s cpuState = cpuState_unknown;
#include "../util/common.h"
#define SOFTRESET_VECTOR 0x3F2
#define NMI_VECTOR 0xFFFA
#define RESET_VECTOR 0xFFFC
#define IRQ_VECTOR 0xFFFE
const unsigned long long int iterations = G;
unsigned long long int inst_cnt = 0;
unsigned int video_fps_divider = DEF_VIDEO_DIV;
unsigned int fps = DEFAULT_FPS;
const double default_MHz_6502 = DEFAULT_MHZ_6502; // default_crystal_MHz / 14; // 1.023; // 2 * M; // 4 * M; // 8 * M; // 16 * M; // 128 * M; // 256 * M; // 512 * M;
const double iigs_MHz_6502 = 2.8;
const double iicplus_MHz_6502 = 4;
const double startup_MHz_6502 = 32;
double MHz_6502 = default_MHz_6502;
unsigned int clk_6502_per_frm = FRAME_INIT( default_MHz_6502 );
unsigned int clk_6502_per_frm_set = FRAME_INIT( default_MHz_6502 );
unsigned int clk_6502_per_frm_max_sound = 4 * FRAME_INIT( default_MHz_6502 );
unsigned int clk_6502_per_frm_max = 0;
unsigned long long tick_per_sec = G;
unsigned long long tick_6502_per_sec = 0;
//INLINE unsigned long long rdtsc(void)
//{
// unsigned hi, lo;
// __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi) );
// return ( (unsigned long long)lo) | ( ((unsigned long long)hi) << 32 );
//}
m6502_t m6502 = {
0, // A
0, // X
0, // Y
0, // C
0, // Z
0, // I
0, // D
0, // B
0, // res
0, // V
0, // N
0, // PC
0, // SP
0, // clktime
0, // clklast
0, // clkfrm
// 0, // clk_wrenable
0, // lastIO
0, // ecoSpindown
0, // debugger.on
0xFF, // debugger.SP
0, // debugger.wMask
HALT, // IF
};
const int ecoSpindown = 25; // initial value of ECO Spingdown Counter
#include "6502_dis_utils.h"
#include "../dev/mem/mmio.h"
INLINE void set_flags_N( const uint8_t test ) {
m6502.N = BITTEST(test, 7);
}
INLINE void set_flags_V( const uint8_t test ) {
m6502.V = BITTEST(test, 6);
}
INLINE void set_flags_Z( const uint8_t test ) {
m6502.Z = !test;
}
INLINE void set_flags_C( const int16_t test ) {
m6502.C = test >= 0;
}
INLINE void set_flags_NZ( const uint8_t test ) {
set_flags_N(test);
set_flags_Z(test);
}
INLINE void set_flags_NV( const uint8_t test ) {
set_flags_N(test);
set_flags_V(test);
}
INLINE void set_flags_NVZ( const uint8_t test ) {
set_flags_NZ(test);
set_flags_V(test);
}
INLINE void set_flags_NZC( const int16_t test ) {
set_flags_NZ(test);
set_flags_C(test);
}
typedef struct {
uint8_t L;
uint8_t H;
} bytes_t;
/**
Instruction Implementations
!!!! `his has to be here!!!
This idea is that "INLINE" would work only if it is
located in the same source file -- hence the include...
**/
INLINE flags_t getFlags(void) {
flags_t f = {
m6502.C != 0, // Carry Flag
m6502.Z != 0, // Zero Flag
m6502.I != 0, // Interrupt Flag
m6502.D != 0, // Decimal Flag
m6502.B != 0, // B Flag
m6502.res != 0, // reserved -- should be always 1
m6502.V != 0, // Overflow Flag ???
m6502.N != 0, // Negative Flag
};
return f;
}
INLINE void setFlags( uint8_t byte ) {
flags_t flags = { .SR = byte };
m6502.C = flags.C; // Carry Flag
m6502.Z = flags.Z; // Zero Flag
m6502.I = flags.I; // Interrupt Flag
m6502.D = flags.D; // Decimal Flag
m6502.B = flags.B; // B Flag
m6502.res = flags.res; // reserved -- should be always 1
m6502.V = flags.V; // Overflow Flag ???
m6502.N = flags.N; // Negative Flag
}
#include "6502_instructions.h"
INLINE int m6502_Step(void) {
#ifdef DEBUG___
switch ( m6502.PC ) {
case 0x1E60:
printf("Wavy Navy...\n");
break;
default:
break;
}
switch ( m6502.PC ) {
case 0xC600:
printf("DISK...\n");
break;
case 0xC62F:
printf("DISK IO...\n");
break;
default:
break;
}
switch ( m6502.PC ) {
case 0xE000:
dbgPrintf("START...\n");
break;
case 0xF168:
dbgPrintf("START...\n");
break;
case 0xF16B:
dbgPrintf("START...\n");
break;
case 0xF195: // RAM size init
dbgPrintf("START...\n");
break;
default:
break;
}
#endif
disNewInstruction();
switch ( fetch() ) {
#include "6502_std.h" // Standard 6502 instructions
//#include "6502_und.h" // Undocumented 6502 instructions
#include "6502_C.h" // Extended 65C02 instructions
#include "6502_C_Rockwell.h" // Extended 65C02 instructions
default:
dbgPrintf("%04X: Unimplemented Instruction 0x%02X\n", m6502.PC -1, memread( m6502.PC -1 ));
// printf("%04X: Unimplemented Instruction 0x%02X\n", m6502.PC -1, memread( m6502.PC -1 ));
m6502.interrupt = INV;
return 2;
} // switch fetch16
return 2;
}
unsigned long long ee = 0;
unsigned long long dd = 0;
// nanosec does not work very well for some reason
struct timespec tim = { 0, 400L };
double mips = 0;
double mhz = 0;
unsigned long long epoch = 0;
void interrupt_IRQ(void) {
m6502.PC = memread16(IRQ_VECTOR);
// TODO: PUSH things onto stack?
}
void interrupt_NMI(void) {
m6502.PC = memread16(NMI_VECTOR);
// TODO: PUSH things onto stack?
}
void hardReset(void) {
m6502.PC = memread16(RESET_VECTOR);
// make sure it will be a cold reset...
_memwrite(0x3F4, 0);
m6502.SP = 0xFF;
// N V - B D I Z C
// 0 0 1 0 0 1 0 1
setFlags(0x25);
}
void softReset(void) {
// m6502.PC = memread16(SOFTRESET_VECTOR);
m6502.PC = memread16( RESET_VECTOR );
m6502.SP = 0xFF;
// N V - B D I Z C
// 0 0 1 0 0 1 0 1
setFlags(0x25);
spkr_stopAll();
resetMemory();
}
void m6502_Run(void) {
// init time
//#ifdef CLK_WAIT
// unsigned long long elpased = (unsigned long long)-1LL;
//#endif
m6502.clktime += m6502.clkfrm;
m6502.clkfrm = 0;
m6502.lastIO = 0;
// make sure we aare not debugging
m6502.debugger.on = 0;
m6502.debugger.wMask = 0;
if( diskAccelerator_count ) {
if( --diskAccelerator_count <= 0 ) {
// make sure we only adjust clock once to get back to normal
diskAccelerator_count = 0;
clk_6502_per_frm = clk_6502_per_frm_set;
}
}
#ifdef SPEEDTEST
for ( inst_cnt = 0; inst_cnt < iterations ; inst_cnt++ )
#elif defined( CLK_WAIT )
// we clear the clkfrm from ViewController Update()
// we will also use this to pause the simulation if not finished by the end of the frame
for ( clk_6502_per_frm_max = clk_6502_per_frm; m6502.clkfrm < clk_6502_per_frm_max ; m6502.clkfrm += m6502_Step() )
#else
// this is for max speed only -- WARNING! It works only if simulation runs in a completely different thread from the Update()
for ( ; ; )
#endif
{
// TODO: clkfrm is already increamented!!!
printDisassembly(outdev);
#ifdef INTERRUPT_CHECK_PER_STEP
if ( m6502.IF ) {
switch (m6502.interrupt) {
case HALT:
// CPU is haletd, nothing to do here...
return;
case IRQ:
interrupt_IRQ();
break;
case NMI:
interrupt_NMI();
break;
case HARDRESET:
hardReset();
break;
case SOFTRESET:
softReset();
break;
default:
break;
}
m6502.IF = 0;
}
#endif // INTERRUPT_CHECK_PER_STEP
}
if ( cpuMode == cpuMode_eco ) {
// check if this is a busy keyboard poll (aka waiting for user input)
if ( m6502.clkfrm - m6502.lastIO < 16 ) {
if (m6502.ecoSpindown) {
m6502.ecoSpindown--;
}
else {
cpuState = cpuState_halting;
}
}
}
// play the entire sound buffer for this frame
spkr_update();
// this will take care of turning off disk motor sound when time is up
spkr_update_disk_sfx();
}
void read_rom( const char * bundlePath, const char * filename, uint8_t * rom, const uint16_t addr, const uint16_t size ) {
char fullPath[256];
strcpy( fullPath, bundlePath );
strcat( fullPath, "/");
strcat( fullPath, filename );
FILE * f = fopen(fullPath, "rb");
if (f == NULL) {
perror("Failed to read ROM image: ");
return;
}
fseek(f, 0L, SEEK_END);
uint16_t flen = ftell(f);
fseek(f, 0L, SEEK_SET);
if ( size && (size > flen) ) {
printf("ROM image is too small (size:0x%04X flen:0x%04X)\n", size, flen);
return;
}
fread( rom + addr, 1, size, f);
fclose(f);
}
size_t getFileSize ( const char * fullPath ) {
FILE * f = fopen(fullPath, "rb");
if (f == NULL) {
perror("Failed to get filesize for ROM image: ");
return 0;
}
fseek(f, 0L, SEEK_END);
size_t flen = ftell(f);
fseek(f, 0L, SEEK_SET);
fclose(f);
return flen;
}
void rom_loadFile( const char * bundlePath, const char * filename ) {
char fullPath[256];
strcpy( fullPath, bundlePath );
strcat( fullPath, "/");
strcat( fullPath, filename );
printf("Loading ROM: %s\n", filename);
size_t flen = getFileSize(fullPath);
if ( flen == 0 ) {
return; // there was an error
}
else if ( flen == 32 * KB ) {
read_rom( bundlePath, filename, INT_64K_ROM + 0x8000, 0, 32 * KB);
memcpy(Apple2_64K_MEM + 0xC000, INT_64K_ROM + 0xC000, 16 * KB); // activate the upper ROM
}
else if ( flen == 16 * KB ) {
read_rom( bundlePath, filename, INT_64K_ROM + 0xC000, 0, 16 * KB);
memcpy(Apple2_64K_MEM + 0xC000, INT_64K_ROM + 0xC000, 16 * KB);
}
else if ( flen == 12 * KB ) {
read_rom( bundlePath, filename, INT_64K_ROM + 0xD000, 0x1000, 12 * KB);
memcpy(Apple2_64K_MEM + 0xD000, INT_64K_ROM + 0xD000, 12 * KB);
}
// make a copy of the perfieral ROM area -- so it will fall back to this if no card inserted
memcpy(EXP_64K_ROM + 0xC100, INT_64K_ROM + 0xC100, 0x0F00);
}
void openLog(void) {
#ifdef DISASS_TRACE
outdev = fopen("/Users/trudnai/Library/Containers/com.trudnai.steveii/Data/disassembly_new.log", "w+");
#endif
// for DEBUG ONLY!!! -- use stdout if could not create log file
// if (outdev == NULL) {
// outdev = stdout;
// }
}
void closeLog(void) {
if ( ( outdev ) && ( outdev != stdout ) && ( outdev != stderr ) ) {
fclose(outdev);
}
}
void m6502_ColdReset( const char * bundlePath, const char * romFileName ) {
inst_cnt = 0;
spkr_init();
clk_6502_per_frm =
clk_6502_per_frm_max =
clk_6502_per_frm_set = 0;
// wait 100ms to be sure simulation has been halted
usleep(100000);
// printf("Bundlepath: %s\n", bundlePath);
// epoch = rdtsc();
// sleep(1);
// unsigned long long e = rdtsc();
// tick_per_sec = e - epoch;
// tick_6502_per_sec = tick_per_sec / MHz_6502;
initMemory();
#ifdef FUNCTIONTEST
read_rom( bundlePath, "6502_functional_test.bin", Apple2_64K_RAM, 0, 0);
memcpy(Apple2_64K_MEM, Apple2_64K_RAM, 65536);
m6502.PC = 0x400;
#else
// Apple ][+ ROM
rom_loadFile(bundlePath, romFileName);
// Disk ][ ROM in Slot 6
read_rom( bundlePath, "DISK_II_C600.ROM", EXP_64K_ROM, 0xC600, 0x100);
memcpy(Apple2_64K_MEM + 0xC600, EXP_64K_ROM + 0xC600, 0x100);
m6502.A = m6502.X = m6502.Y = 0xFF;
// reset vector
m6502.SP = 0xFF; //-3;
// N V - B D I Z C
// 0 0 1 0 0 1 0 0
setFlags(0x24);
m6502.IF = 0;
// memory size
//*((uint16_t*)(&RAM[0x73])) = 0xC000;
m6502.PC = memread16( RESET_VECTOR );
#endif
#ifdef DEBUG_COUNTER_TEST
uint8_t counter[] = {
// 1 * COUNTER2
// 2
// 3 ORG $1000
// 4 SCREEN EQU $400
// 5 HOME EQU $FC58
// 6 DIGITS EQU $06
// 7 ZERO EQU $B0
// 8 CARRY EQU $BA
// 9 RDKEY EQU $FD0C
//10
// I have placed NOP to keep addresses
0xA0, 0x09, 0xEA, //11 LDY #$09 ; NOP
0x84, 0x06, //12 STY #DIGITS
0xEA, 0xEA, //13 NOP NOP
0xEA, 0xEA, 0xEA, //14 NOP NOP NOP
0xA6, 0x06, //15 LDY DIGITS
0xA9, 0xB0, //16 CLEAR LDA #ZERO
0x99, 0x00, 0x04, //17 STA SCREEN,Y
0x88, //18 DEY
0x10, 0xF8, //19 BPL CLEAR
0xA4, 0x06, //20 START LDY DIGITS
0x20, 0x36, 0x10, //21 ONES JSR INC
0xB9, 0x00, 0x04, //22 LDA SCREEN,Y
0xC9, 0xBA, //23 CMP #CARRY
0xD0, 0xF6, //24 BNE ONES
0xA9, 0xB0, //25 NEXT LDA #ZERO
0x99, 0x00, 0x04, //26 STA SCREEN,Y
0x88, //27 DEY
0x30, 0x0D, //28 BMI END
0x20, 0x36, 0x10, //29 JSR INC
0xB9, 0x00, 0x04, //30 LDA SCREEN,Y
0xC9, 0xBA, //31 CMP #CARRY
0xD0, 0xE2, //32 BNE START
0x4C, 0x20, 0x10, //33 JMP NEXT
0x60, //34 END RTS
0xB9, 0x00, 0x04, //36 INC LDA SCREEN,Y
0xAA, //37 TAX
0xE8, //38 INX
0x8A, //39 TXA
0x99, 0x00, 0x04, //40 STA SCREEN,Y
0x60, //41 RTS
};
uint8_t counter_fast[] = {
// 1 * COUNTER2
// 2
// 3 ORG $1000
// 4 SCREEN EQU $400
// 5 HOME EQU $FC58
// 6 DIGITS EQU $06
// 7 ZERO EQU $B0
// 8 CARRY EQU $BA
// 9 RDKEY EQU $FD0C
//10
// I have placed NOP to keep addresses
0xA0, 0x06, // 00 LDY #$09
0x84, 0x06, // 02 STY #DIGITS
0xA6, 0x06, // 04 LDY DIGITS
0xA9, 0xB0, // 06 CLEAR LDA #ZERO
0x99, 0x00, 0x04, // 08 STA SCREEN,Y
0x88, // 0B DEY
0x10, 0xF8, // 0C BPL CLEAR
0xA6, 0x06, // 0E START LDX DIGITS
0xA9, 0xBA, // 10 LDA #CARRY
0xFE, 0x00, 0x04, // 12 ONES INC SCREEN,X
0xDD, 0x00, 0x04, // 15 CMP SCREEN,X
0xD0, 0xF8, // 18 BNE ONES
0xA9, 0xB0, // 1A NEXT LDA #ZERO
0x9D, 0x00, 0x04, // 1C STA SCREEN,X
0xCA, // 1F DEX
0x30, 0x0C, // 20 BMI END
0xFE, 0x00, 0x04, // 22 INC SCREEN,X
0xBD, 0x00, 0x04, // 25 LDA SCREEN,X
0xC9, 0xBA, // 28 CMP #CARRY
0xD0, 0xE2, // 2A BNE START
0xF0, 0xEC, // 2C BEQ NEXT
0x60, // 2E END RTS
};
#endif
// set the default speed
clk_6502_per_frm_set = clk_6502_per_frm = FRAME(default_MHz_6502);
// Initialize Paddle / Game Controller / Joystick / Mouse Buttons
setIO(0xC061, 0);
setIO(0xC062, 0);
setIO(0xC063, 1 << 7); // inverted (bit 7: not pressed)
}
void tst6502(void) {
// insert code here...
printf("6502\n");
m6502_ColdReset( "", "" );
// clock_t start = clock();
// epoch = rdtsc();
m6502_Run();
// clock_t end = clock();
// double execution_time = ((double) (end - start)) / CLOCKS_PER_SEC;
#ifdef SPEEDTEST
unsigned long long end = rdtsc();
unsigned long long elapsed = end - epoch;
double execution_time = (double)elapsed / tick_per_sec;
double mips = inst_cnt / (execution_time * M);
double mhz = m6502.clktime / (execution_time * M);
printf("clk:%llu Elpased time: (%llu / %u / %llu), %.3lfs (%.3lf MIPS, %.3lf MHz)\n", iterations *3, tick_per_sec, MHz_6502, tick_6502_per_sec, execution_time, mips, mhz);
// printf(" dd:%llu ee:%llu nn:%llu\n", dd, ee, ee - dd);
#endif
}
int ___main(int argc, const char * argv[]) {
tst6502();
return 0;
}
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