mirror of
https://github.com/st3fan/ewm.git
synced 2024-05-29 08:41:28 +00:00
Initial import
This commit is contained in:
Stefan Arentz
commit
c16b34f14a
18
Makefile
Normal file
18
Makefile
Normal file
|
|
@ -0,0 +1,18 @@
|
|||
|
||||
CC=clang
|
||||
CFLAGS=-O3 -std=c11 -Werror -Wall -Wshadow -Wpointer-arith -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
|
||||
SOURCES=cpu.c ins.c pia.c mem.c ewm.c
|
||||
OBJECTS=$(SOURCES:.c=.o)
|
||||
LIBS=-lcurses
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||||
EXECUTABLE=ewm
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||||
|
||||
all: $(SOURCES) $(EXECUTABLE)
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||||
|
||||
clean:
|
||||
rm -f $(OBJECTS) $(EXECUTABLE)
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||||
|
||||
$(EXECUTABLE): $(OBJECTS)
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||||
$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $@
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||||
|
||||
.c.o:
|
||||
$(CC) $(CFLAGS) $< -c -o $@
|
||||
340
cpu.c
Normal file
340
cpu.c
Normal file
|
|
@ -0,0 +1,340 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
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||||
#include <stdint.h>
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||||
#include <inttypes.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
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||||
|
||||
#include <mach/mach.h>
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||||
#include <mach/mach_time.h>
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||||
|
||||
#include "cpu.h"
|
||||
#include "ins.h"
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||||
|
||||
/* Private API */
|
||||
|
||||
typedef void (*cpu_instruction_handler_t)(struct cpu_t *cpu);
|
||||
typedef void (*cpu_instruction_handler_byte_t)(struct cpu_t *cpu, uint8_t oper);
|
||||
typedef void (*cpu_instruction_handler_word_t)(struct cpu_t *cpu, uint16_t oper);
|
||||
|
||||
static uint8_t _mem_get_byte(struct cpu_t *cpu, uint16_t addr) {
|
||||
return cpu->memory[addr];
|
||||
}
|
||||
|
||||
static uint16_t _mem_get_word(struct cpu_t *cpu, uint16_t addr) {
|
||||
return *((uint16_t*) &cpu->memory[addr]);
|
||||
}
|
||||
|
||||
#if 1
|
||||
static void cpu_format_instruction(struct cpu_t *cpu, char *buffer) {
|
||||
*buffer = 0x00;
|
||||
|
||||
cpu_instruction_t *i = &instructions[cpu->memory[cpu->state.pc]];
|
||||
uint8_t opcode = cpu->memory[cpu->state.pc];
|
||||
|
||||
/* Single byte instructions */
|
||||
if (i->bytes == 1) {
|
||||
sprintf(buffer, "%s", i->name);
|
||||
}
|
||||
|
||||
/* JSR is the only exception */
|
||||
else if (opcode == 0x20) {
|
||||
sprintf(buffer, "%s $%.4X", i->name, _mem_get_word(cpu, cpu->state.pc+1));
|
||||
}
|
||||
|
||||
/* Branches */
|
||||
else if ((opcode & 0b00011111) == 0b00010000) {
|
||||
int8_t offset = (int8_t) _mem_get_byte(cpu, cpu->state.pc+1);
|
||||
uint16_t addr = cpu->state.pc + 2 + offset;
|
||||
sprintf(buffer, "%s $%.4X", i->name, addr);
|
||||
}
|
||||
|
||||
else if ((opcode & 0b00000011) == 0b00000001) {
|
||||
switch ((opcode & 0b00011100) >> 2) {
|
||||
case 0b000:
|
||||
sprintf(buffer, "%s ($%.2X,X)", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b001:
|
||||
sprintf(buffer, "%s $%.2X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b010:
|
||||
sprintf(buffer, "%s #$%.2X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b011:
|
||||
sprintf(buffer, "%s $%.2X%.2X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
case 0b100:
|
||||
sprintf(buffer, "%s ($%.2X),Y", i->name, cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
case 0b101:
|
||||
sprintf(buffer, "%s $%.2X,X", i->name, cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
case 0b110:
|
||||
sprintf(buffer, "%s $%.2X%.2X,Y", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
case 0b111:
|
||||
sprintf(buffer, "%s $%.2X%.2X,X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
else if ((opcode & 0b00000011) == 0b00000010) {
|
||||
switch ((opcode & 0b00011100) >> 2) {
|
||||
case 0b000:
|
||||
sprintf(buffer, "%s #$%.2X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b001:
|
||||
sprintf(buffer, "%s $%.2X", i->name, cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
case 0b010:
|
||||
sprintf(buffer, "%s", i->name);
|
||||
break;
|
||||
case 0b011:
|
||||
sprintf(buffer, "%s $%.2X%.2X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b101:
|
||||
sprintf(buffer, "%s $%.2X,X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b111:
|
||||
sprintf(buffer, "%s $%.2X%.2X,X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
else if ((opcode & 0b00000011) == 0b00000000) {
|
||||
switch ((opcode & 0b00011100) >> 2) {
|
||||
case 0b000:
|
||||
sprintf(buffer, "%s #$%.2X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b001:
|
||||
sprintf(buffer, "%s $%.2X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b011:
|
||||
sprintf(buffer, "%s $%.2X%.2X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b101:
|
||||
sprintf(buffer, "%s $%.2X,X", i->name, cpu->memory[cpu->state.pc+1]);
|
||||
break;
|
||||
case 0b111:
|
||||
sprintf(buffer, "%s $%.2X%.2X,X", i->name, cpu->memory[cpu->state.pc+2], cpu->memory[cpu->state.pc+1]);
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||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void cpu_format_state(struct cpu_t *cpu, char *buffer) {
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sprintf(buffer, "A=%.2X X=%.2X Y=%.2X S=%.2X SP=%.4X %c%c%c%c%c%c%c%c",
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||||
cpu->state.a, cpu->state.x, cpu->state.y, cpu->state.s, cpu->state.sp,
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||||
|
||||
cpu->state.n ? 'N' : '-',
|
||||
cpu->state.v ? 'V' : '-',
|
||||
'-',
|
||||
cpu->state.b ? 'B' : '-',
|
||||
cpu->state.d ? 'D' : '-',
|
||||
cpu->state.i ? 'I' : '-',
|
||||
cpu->state.z ? 'Z' : '-',
|
||||
cpu->state.c ? 'C' : '-');
|
||||
}
|
||||
|
||||
static void cpu_format_stack(struct cpu_t *cpu, char *buffer) {
|
||||
*buffer = 0x00;
|
||||
for (uint16_t sp = cpu->state.sp; sp != 0x01ff; sp++) {
|
||||
char tmp[8];
|
||||
sprintf(tmp, " %.2X", _mem_get_byte(cpu, sp));
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||||
buffer = strcat(buffer, tmp);
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||||
}
|
||||
}
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#endif
|
||||
|
||||
static mach_timebase_info_data_t timebase_info;
|
||||
|
||||
static uint64_t abs_to_nanos(uint64_t abs) {
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return abs * timebase_info.numer / timebase_info.denom;
|
||||
}
|
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|
||||
static uint64_t nanos_to_abs(uint64_t nanos) {
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||||
return nanos * timebase_info.denom / timebase_info.numer;
|
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}
|
||||
|
||||
static int cpu_execute_instruction(struct cpu_t *cpu) {
|
||||
|
||||
|
||||
/* Trace code - Refactor into its own function or module */
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||||
char trace_instruction[256];
|
||||
char trace_state[256];
|
||||
char trace_stack[256];
|
||||
|
||||
if (cpu->trace) {
|
||||
cpu_format_instruction(cpu, trace_instruction);
|
||||
}
|
||||
|
||||
|
||||
uint64_t start_time = mach_absolute_time();
|
||||
|
||||
/* Fetch instruction */
|
||||
cpu_instruction_t *i = &instructions[cpu->memory[cpu->state.pc]];
|
||||
|
||||
/* Remember the PC since some instructions modify it */
|
||||
uint16_t pc = cpu->state.pc;
|
||||
|
||||
/* Advance PC */
|
||||
if (pc == cpu->state.pc) {
|
||||
cpu->state.pc += i->bytes;
|
||||
}
|
||||
|
||||
/* Execute instruction */
|
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switch (i->bytes) {
|
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case 1:
|
||||
((cpu_instruction_handler_t) i->handler)(cpu);
|
||||
break;
|
||||
case 2:
|
||||
((cpu_instruction_handler_byte_t) i->handler)(cpu, _mem_get_byte(cpu, pc+1));
|
||||
break;
|
||||
case 3:
|
||||
((cpu_instruction_handler_word_t) i->handler)(cpu, _mem_get_word(cpu, pc+1));
|
||||
break;
|
||||
}
|
||||
|
||||
|
||||
if (cpu->trace) {
|
||||
cpu_format_state(cpu, trace_state);
|
||||
cpu_format_stack(cpu, trace_stack); // TODO: This crashes on the hello world test
|
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|
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switch (i->bytes) {
|
||||
case 1:
|
||||
fprintf(stderr, "CPU: %.4X %-20s | %.2X %-20s STACK: %s\n",
|
||||
pc, trace_instruction, cpu->memory[pc], trace_state, trace_stack);
|
||||
break;
|
||||
case 2:
|
||||
fprintf(stderr, "CPU: %.4X %-20s | %.2X %.2X %-20s STACK: %s\n",
|
||||
pc, trace_instruction, cpu->memory[pc], cpu->memory[pc+1], trace_state, trace_stack);
|
||||
break;
|
||||
case 3:
|
||||
fprintf(stderr, "CPU: %.4X %-20s | %.2X %.2X %.2X %-20s STACK: %s\n",
|
||||
pc, trace_instruction, cpu->memory[pc], cpu->memory[pc+1], cpu->memory[pc+2], trace_state, trace_stack);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
/* Delay */
|
||||
|
||||
if (timebase_info.denom == 0) {
|
||||
(void) mach_timebase_info(&timebase_info);
|
||||
}
|
||||
|
||||
uint64_t now = mach_absolute_time();
|
||||
|
||||
uint64_t elapsed_nano = abs_to_nanos(now - start_time);
|
||||
uint64_t expected_duration = (i->cycles * (1000000000 / 960000));
|
||||
uint64_t delay_nano = expected_duration - elapsed_nano;
|
||||
|
||||
//fprintf(stderr, "Expected: %" PRId64 " Elapsed: %" PRId64 " Delay: %" PRId64 "\n", expected_duration, elapsed_nano, delay_nano);
|
||||
|
||||
mach_wait_until(now + nanos_to_abs(delay_nano));
|
||||
|
||||
return i->opcode;
|
||||
}
|
||||
|
||||
static void iom_init(struct iom_t *iom, uint16_t start, uint16_t length, void *obj, iom_read_handler_t read_handler, iom_write_handler_t write_handler) {
|
||||
memset(iom, 0x00, sizeof(struct iom_t));
|
||||
iom->start = start;
|
||||
iom->length = length;
|
||||
iom->obj = obj;
|
||||
iom->read_handler = read_handler;
|
||||
iom->write_handler = write_handler;
|
||||
}
|
||||
|
||||
/* Public API */
|
||||
|
||||
void cpu_init(struct cpu_t *cpu) {
|
||||
memset(cpu, 0x00, sizeof(struct cpu_t));
|
||||
cpu->memory = malloc(64 * 1024);
|
||||
}
|
||||
|
||||
void cpu_add_ram(struct cpu_t *cpu, uint16_t start, uint16_t length, uint8_t *data) {
|
||||
if (data != NULL) {
|
||||
memcpy(cpu->memory + start, data, length);
|
||||
}
|
||||
/* TODO: Mark pages as RAM */
|
||||
}
|
||||
|
||||
void cpu_add_rom(struct cpu_t *cpu, uint16_t start, uint16_t length, uint8_t *data) {
|
||||
if (data != NULL) {
|
||||
memcpy(cpu->memory + start, data, length);
|
||||
}
|
||||
/* TODO: Mark pages as ROM */
|
||||
}
|
||||
|
||||
void cpu_add_iom(struct cpu_t *cpu, uint16_t start, uint16_t length, void *obj, iom_read_handler_t read_handler, iom_write_handler_t write_handler) {
|
||||
struct iom_t *iom = (struct iom_t*) malloc(sizeof(struct iom_t));
|
||||
iom_init(iom, start, length, obj, read_handler, write_handler);
|
||||
iom->next = (struct iom_t*) cpu->iom;
|
||||
cpu->iom = iom;
|
||||
/* TODO: Mark pages as IO */
|
||||
}
|
||||
|
||||
void cpu_trace(struct cpu_t *cpu, uint8_t trace) {
|
||||
cpu->trace = trace;
|
||||
}
|
||||
|
||||
void cpu_reset(struct cpu_t *cpu) {
|
||||
cpu->state.pc = _mem_get_word(cpu, 0xfffc);
|
||||
cpu->state.sp = 0x01ff;
|
||||
}
|
||||
|
||||
void cpu_brk(struct cpu_t *cpu) {
|
||||
|
||||
}
|
||||
|
||||
void cpu_irq(struct cpu_t *cpu) {
|
||||
/* TODO: Implement support for IRQ triggering */
|
||||
}
|
||||
|
||||
void cpu_nmi(struct cpu_t *cpu) {
|
||||
/* TODO: Implement support for interrupt triggering */
|
||||
}
|
||||
|
||||
void cpu_run(struct cpu_t *cpu) {
|
||||
uint64_t instruction_count = 0;
|
||||
while (cpu_execute_instruction(cpu) != 0x00) {
|
||||
/* TODO: Tick? */
|
||||
instruction_count++;
|
||||
}
|
||||
fprintf(stderr, "Executed %" PRId64 " instructions\n", instruction_count);
|
||||
}
|
||||
|
||||
void cpu_boot(struct cpu_t *cpu) {
|
||||
cpu_reset(cpu);
|
||||
cpu_run(cpu);
|
||||
}
|
||||
|
||||
void cpu_step(struct cpu_t *cpu) {
|
||||
cpu_execute_instruction(cpu);
|
||||
}
|
||||
76
cpu.h
Normal file
76
cpu.h
Normal file
|
|
@ -0,0 +1,76 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#ifndef CPU_H
|
||||
#define CPU_H
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
struct iom_t {
|
||||
uint16_t start;
|
||||
uint16_t length;
|
||||
void *obj;
|
||||
void *read_handler;
|
||||
void *write_handler;
|
||||
struct iom_t *next;
|
||||
};
|
||||
|
||||
struct cpu_state_t {
|
||||
uint8_t a, x, y, s;
|
||||
uint16_t sp;
|
||||
uint16_t pc;
|
||||
uint8_t n, v, b, d, i, z, c;
|
||||
};
|
||||
|
||||
struct cpu_t {
|
||||
struct cpu_state_t state;
|
||||
uint8_t *memory;
|
||||
uint8_t trace;
|
||||
struct iom_t *iom;
|
||||
};
|
||||
|
||||
typedef uint8_t (*iom_read_handler_t)(struct cpu_t *cpu, void *obj, uint16_t addr);
|
||||
typedef void (*iom_write_handler_t)(struct cpu_t *cpu, void *obj, uint16_t addr, uint8_t b);
|
||||
|
||||
void cpu_init(struct cpu_t *cpu);
|
||||
void cpu_add_ram(struct cpu_t *cpu, uint16_t start, uint16_t length, uint8_t *data);
|
||||
void cpu_add_rom(struct cpu_t *cpu, uint16_t start, uint16_t length, uint8_t *data);
|
||||
void cpu_add_iom(struct cpu_t *cpu, uint16_t start, uint16_t length, void *obj, iom_read_handler_t read_handler, iom_write_handler_t write_handler);
|
||||
|
||||
void cpu_trace(struct cpu_t *cpu, uint8_t trace);
|
||||
|
||||
void cpu_reset(struct cpu_t *cpu);
|
||||
void cpu_brk(struct cpu_t *cpu);
|
||||
void cpu_irq(struct cpu_t *cpu);
|
||||
void cpu_nmi(struct cpu_t *cpu);
|
||||
|
||||
void cpu_run(struct cpu_t *cpu);
|
||||
void cpu_boot(struct cpu_t *cpu);
|
||||
void cpu_step(struct cpu_t *cpu);
|
||||
|
||||
uint16_t cpu_memory_get_word(struct cpu_t *cpu, uint16_t addr);
|
||||
uint8_t cpu_memory_get_byte(struct cpu_t *cpu, uint16_t addr);
|
||||
|
||||
void cpu_memory_set_word(struct cpu_t *cpu, uint16_t addr, uint16_t v);
|
||||
void cpu_memory_set_byte(struct cpu_t *cpu, uint16_t addr, uint8_t v);
|
||||
|
||||
#endif
|
||||
80
ewm.c
Normal file
80
ewm.c
Normal file
|
|
@ -0,0 +1,80 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include "cpu.h"
|
||||
#include "mem.h"
|
||||
#include "pia.h"
|
||||
|
||||
static uint8_t monitor[256] = {
|
||||
0xD8, 0x58, 0xA0, 0x7F, 0x8C, 0x12, 0xD0, 0xA9,
|
||||
0xA7, 0x8D, 0x11, 0xD0, 0x8D, 0x13, 0xD0, 0xC9,
|
||||
0xDF, 0xF0, 0x13, 0xC9, 0x9B, 0xF0, 0x03, 0xC8,
|
||||
0x10, 0x0F, 0xA9, 0xDC, 0x20, 0xEF, 0xFF, 0xA9,
|
||||
0x8D, 0x20, 0xEF, 0xFF, 0xA0, 0x01, 0x88, 0x30,
|
||||
0xF6, 0xAD, 0x11, 0xD0, 0x10, 0xFB, 0xAD, 0x10,
|
||||
0xD0, 0x99, 0x00, 0x02, 0x20, 0xEF, 0xFF, 0xC9,
|
||||
0x8D, 0xD0, 0xD4, 0xA0, 0xFF, 0xA9, 0x00, 0xAA,
|
||||
0x0A, 0x85, 0x2B, 0xC8, 0xB9, 0x00, 0x02, 0xC9,
|
||||
0x8D, 0xF0, 0xD4, 0xC9, 0xAE, 0x90, 0xF4, 0xF0,
|
||||
0xF0, 0xC9, 0xBA, 0xF0, 0xEB, 0xC9, 0xD2, 0xF0,
|
||||
0x3B, 0x86, 0x28, 0x86, 0x29, 0x84, 0x2A, 0xB9,
|
||||
0x00, 0x02, 0x49, 0xB0, 0xC9, 0x0A, 0x90, 0x06,
|
||||
0x69, 0x88, 0xC9, 0xFA, 0x90, 0x11, 0x0A, 0x0A,
|
||||
0x0A, 0x0A, 0xA2, 0x04, 0x0A, 0x26, 0x28, 0x26,
|
||||
0x29, 0xCA, 0xD0, 0xF8, 0xC8, 0xD0, 0xE0, 0xC4,
|
||||
0x2A, 0xF0, 0x97, 0x24, 0x2B, 0x50, 0x10, 0xA5,
|
||||
0x28, 0x81, 0x26, 0xE6, 0x26, 0xD0, 0xB5, 0xE6,
|
||||
0x27, 0x4C, 0x44, 0xFF, 0x6C, 0x24, 0x00, 0x30,
|
||||
0x2B, 0xA2, 0x02, 0xB5, 0x27, 0x95, 0x25, 0x95,
|
||||
0x23, 0xCA, 0xD0, 0xF7, 0xD0, 0x14, 0xA9, 0x8D,
|
||||
0x20, 0xEF, 0xFF, 0xA5, 0x25, 0x20, 0xDC, 0xFF,
|
||||
0xA5, 0x24, 0x20, 0xDC, 0xFF, 0xA9, 0xBA, 0x20,
|
||||
0xEF, 0xFF, 0xA9, 0xA0, 0x20, 0xEF, 0xFF, 0xA1,
|
||||
0x24, 0x20, 0xDC, 0xFF, 0x86, 0x2B, 0xA5, 0x24,
|
||||
0xC5, 0x28, 0xA5, 0x25, 0xE5, 0x29, 0xB0, 0xC1,
|
||||
0xE6, 0x24, 0xD0, 0x02, 0xE6, 0x25, 0xA5, 0x24,
|
||||
0x29, 0x07, 0x10, 0xC8, 0x48, 0x4A, 0x4A, 0x4A,
|
||||
0x4A, 0x20, 0xE5, 0xFF, 0x68, 0x29, 0x0F, 0x09,
|
||||
0xB0, 0xC9, 0xBA, 0x90, 0x02, 0x69, 0x06, 0x2C,
|
||||
0x12, 0xD0, 0x30, 0xFB, 0x8D, 0x12, 0xD0, 0x60,
|
||||
0x00, 0x00, 0x00, 0x0F, 0x00, 0xFF, 0x00, 0x00
|
||||
};
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
struct pia_t pia;
|
||||
pia_init(&pia);
|
||||
pia_trace(&pia, 0);
|
||||
|
||||
struct cpu_t cpu;
|
||||
cpu_init(&cpu);
|
||||
cpu_add_ram(&cpu, 0x0000, 0x4000, NULL);
|
||||
cpu_add_iom(&cpu, 0xd000, 0x1000, &pia, pia_read, pia_write);
|
||||
cpu_add_rom(&cpu, 0xff00, 0x0100, monitor);
|
||||
cpu_trace(&cpu, 0);
|
||||
cpu_boot(&cpu);
|
||||
|
||||
return 0;
|
||||
}
|
||||
38
ins.h
Normal file
38
ins.h
Normal file
|
|
@ -0,0 +1,38 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#ifndef INS_H
|
||||
#define INS_H
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
typedef struct {
|
||||
char *name;
|
||||
uint8_t opcode;
|
||||
uint8_t bytes;
|
||||
uint8_t cycles;
|
||||
void *handler;
|
||||
} cpu_instruction_t;
|
||||
|
||||
extern cpu_instruction_t instructions[256];
|
||||
|
||||
#endif
|
||||
162
mem.c
Normal file
162
mem.c
Normal file
|
|
@ -0,0 +1,162 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#include "mem.h"
|
||||
|
||||
/* Memory Access */
|
||||
|
||||
uint8_t mem_get_byte(struct cpu_t *cpu, uint16_t addr) {
|
||||
if (cpu->iom) {
|
||||
/* TODO: Assuming there is only one area of memory mapped io */
|
||||
if (addr >= cpu->iom->start && addr < (cpu->iom->start + cpu->iom->length)) {
|
||||
uint8_t v = ((iom_read_handler_t) cpu->iom->read_handler)((struct cpu_t*) cpu, cpu->iom->obj, addr);
|
||||
//fprintf(stderr, "MEM: GETTING BYTE AT %.4X -> %.2X\n", addr, v);
|
||||
return v;
|
||||
}
|
||||
}
|
||||
//fprintf(stderr, "MEM: GETTING BYTE AT %.4X -> %.2X\n", addr, cpu->memory[addr]);
|
||||
return cpu->memory[addr];
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_abs(struct cpu_t *cpu, uint16_t addr) {
|
||||
return mem_get_byte(cpu, addr);
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_absx(struct cpu_t *cpu, uint16_t addr) {
|
||||
return mem_get_byte(cpu, addr + cpu->state.x); /* TODO: Carry? */
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_absy(struct cpu_t *cpu, uint16_t addr) {
|
||||
return mem_get_byte(cpu, addr + cpu->state.y); /* TODO: Carry? */
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_zpg(struct cpu_t *cpu, uint8_t addr) {
|
||||
return mem_get_byte(cpu, addr);
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_zpgx(struct cpu_t *cpu, uint8_t addr) {
|
||||
return mem_get_byte(cpu, ((uint16_t) addr + cpu->state.x) & 0x00ff);
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_zpgy(struct cpu_t *cpu, uint8_t addr) {
|
||||
return mem_get_byte(cpu, ((uint16_t) addr + cpu->state.y) & 0x00ff);
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_indx(struct cpu_t *cpu, uint8_t addr) {
|
||||
return mem_get_byte(cpu, mem_get_word(cpu, addr + cpu->state.x)); // TODO: Does this wrap?
|
||||
}
|
||||
|
||||
uint8_t mem_get_byte_indy(struct cpu_t *cpu, uint8_t addr) {
|
||||
return mem_get_byte(cpu, mem_get_word(cpu, addr) + cpu->state.y);
|
||||
}
|
||||
|
||||
|
||||
|
||||
void mem_set_byte(struct cpu_t *cpu, uint16_t addr, uint8_t v) {
|
||||
//fprintf(stderr, "MEM: SETTING BYTE AT %.4X -> %.2X (%c)\n", addr, v, v & 0x7f);
|
||||
if (cpu->iom) {
|
||||
/* TODO: Assuming there is only one area of memory mapped io */
|
||||
if (addr >= cpu->iom->start && addr < (cpu->iom->start + cpu->iom->length)) {
|
||||
((iom_write_handler_t) cpu->iom->write_handler)((struct cpu_t*) cpu, cpu->iom->obj, addr, v);
|
||||
return;
|
||||
}
|
||||
}
|
||||
cpu->memory[addr] = v;
|
||||
}
|
||||
|
||||
|
||||
|
||||
void mem_set_byte_zpg(struct cpu_t *cpu, uint8_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, addr, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_zpgx(struct cpu_t *cpu, uint8_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, ((uint16_t) addr + cpu->state.x) & 0x00ff, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_zpgy(struct cpu_t *cpu, uint8_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, ((uint16_t) addr + cpu->state.y) & 0x00ff, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_abs(struct cpu_t *cpu, uint16_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, addr, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_absx(struct cpu_t *cpu, uint16_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, addr+cpu->state.x, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_absy(struct cpu_t *cpu, uint16_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, addr+cpu->state.y, v);
|
||||
}
|
||||
|
||||
void mem_set_byte_indx(struct cpu_t *cpu, uint8_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, mem_get_word(cpu, addr+cpu->state.x), v); // TODO: Does this wrap?
|
||||
}
|
||||
|
||||
void mem_set_byte_indy(struct cpu_t *cpu, uint8_t addr, uint8_t v) {
|
||||
mem_set_byte(cpu, mem_get_word(cpu, addr)+cpu->state.y, v);
|
||||
}
|
||||
|
||||
/* MOD */
|
||||
|
||||
void mem_mod_byte_zpg(struct cpu_t *cpu, uint8_t addr, mem_mod_t op) {
|
||||
mem_set_byte_zpg(cpu, addr, op(cpu, mem_get_byte_zpg(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_zpgx(struct cpu_t *cpu, uint8_t addr, mem_mod_t op) {
|
||||
mem_set_byte_zpgx(cpu, addr, op(cpu, mem_get_byte_zpgx(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_zpgy(struct cpu_t *cpu, uint8_t addr, mem_mod_t op) {
|
||||
mem_set_byte_zpgy(cpu, addr, op(cpu, mem_get_byte_zpgy(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_abs(struct cpu_t *cpu, uint16_t addr, mem_mod_t op) {
|
||||
mem_set_byte_abs(cpu, addr, op(cpu, mem_get_byte_abs(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_absx(struct cpu_t *cpu, uint16_t addr, mem_mod_t op) {
|
||||
mem_set_byte_absx(cpu, addr, op(cpu, mem_get_byte_absx(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_absy(struct cpu_t *cpu, uint16_t addr, mem_mod_t op) {
|
||||
mem_set_byte_absy(cpu, addr, op(cpu, mem_get_byte_absy(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_indx(struct cpu_t *cpu, uint8_t addr, mem_mod_t op) {
|
||||
mem_set_byte_indx(cpu, addr, op(cpu, mem_get_byte_indx(cpu, addr)));
|
||||
}
|
||||
|
||||
void mem_mod_byte_indy(struct cpu_t *cpu, uint8_t addr, mem_mod_t op) {
|
||||
mem_set_byte_indy(cpu, addr, op(cpu, mem_get_byte_indy(cpu, addr)));
|
||||
}
|
||||
|
||||
/* Words */
|
||||
|
||||
uint16_t mem_get_word(struct cpu_t *cpu, uint16_t addr) {
|
||||
return *((uint16_t*) &cpu->memory[addr]);
|
||||
}
|
||||
|
||||
void mem_set_word(struct cpu_t *cpu, uint16_t addr, uint16_t v) {
|
||||
*((uint16_t*) &cpu->memory[addr]) = v;
|
||||
}
|
||||
62
mem.h
Normal file
62
mem.h
Normal file
|
|
@ -0,0 +1,62 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#ifndef MEM_H
|
||||
#define MEM_H
|
||||
|
||||
#include "cpu.h"
|
||||
|
||||
typedef uint8_t (*mem_mod_t)(struct cpu_t *cpu, uint8_t b);
|
||||
|
||||
uint8_t mem_get_byte(struct cpu_t *cpu, uint16_t addr);
|
||||
uint8_t mem_get_byte_abs(struct cpu_t *cpu, uint16_t addr);
|
||||
uint8_t mem_get_byte_absx(struct cpu_t *cpu, uint16_t addr);
|
||||
uint8_t mem_get_byte_absy(struct cpu_t *cpu, uint16_t addr);
|
||||
uint8_t mem_get_byte_zpg(struct cpu_t *cpu, uint8_t addr);
|
||||
uint8_t mem_get_byte_zpgx(struct cpu_t *cpu, uint8_t addr);
|
||||
uint8_t mem_get_byte_zpgy(struct cpu_t *cpu, uint8_t addr);
|
||||
uint8_t mem_get_byte_indx(struct cpu_t *cpu, uint8_t addr);
|
||||
uint8_t mem_get_byte_indy(struct cpu_t *cpu, uint8_t addr);
|
||||
|
||||
void mem_set_byte(struct cpu_t *cpu, uint16_t addr, uint8_t v);
|
||||
void mem_set_byte_zpg(struct cpu_t *cpu, uint8_t addr, uint8_t v);
|
||||
void mem_set_byte_zpgx(struct cpu_t *cpu, uint8_t addr, uint8_t v);
|
||||
void mem_set_byte_zpgy(struct cpu_t *cpu, uint8_t addr, uint8_t v);
|
||||
void mem_set_byte_abs(struct cpu_t *cpu, uint16_t addr, uint8_t v);
|
||||
void mem_set_byte_absx(struct cpu_t *cpu, uint16_t addr, uint8_t v);
|
||||
void mem_set_byte_absy(struct cpu_t *cpu, uint16_t addr, uint8_t v);
|
||||
void mem_set_byte_indx(struct cpu_t *cpu, uint8_t addr, uint8_t v);
|
||||
void mem_set_byte_indy(struct cpu_t *cpu, uint8_t addr, uint8_t v);
|
||||
|
||||
void mem_mod_byte_zpg(struct cpu_t *cpu, uint8_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_zpgx(struct cpu_t *cpu, uint8_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_zpgy(struct cpu_t *cpu, uint8_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_abs(struct cpu_t *cpu, uint16_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_absx(struct cpu_t *cpu, uint16_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_absy(struct cpu_t *cpu, uint16_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_indx(struct cpu_t *cpu, uint8_t addr, mem_mod_t op);
|
||||
void mem_mod_byte_indy(struct cpu_t *cpu, uint8_t addr, mem_mod_t op);
|
||||
|
||||
uint16_t mem_get_word(struct cpu_t *cpu, uint16_t addr);
|
||||
void mem_set_word(struct cpu_t *cpu, uint16_t addr, uint16_t v);
|
||||
|
||||
#endif
|
||||
119
pia.c
Normal file
119
pia.c
Normal file
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|
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|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
#include <curses.h>
|
||||
|
||||
#include "cpu.h"
|
||||
#include "pia.h"
|
||||
|
||||
static void pia_dsp_write(uint8_t b) {
|
||||
//fprintf(stderr, "PIA: Sending to display: %.2x / %.2x\n", b, b & 0x7f);
|
||||
b &= 0b01111111;
|
||||
if (b == '\r') {
|
||||
b = '\n';
|
||||
}
|
||||
addch(b);
|
||||
refresh();
|
||||
}
|
||||
|
||||
/* static int pia_kbd_read() { */
|
||||
/* int c = getch(); */
|
||||
/* } */
|
||||
|
||||
/* static uint8_t pia_kbd_read() { */
|
||||
/* return getchar(); */
|
||||
/* } */
|
||||
|
||||
void pia_init(struct pia_t *pia) {
|
||||
initscr();
|
||||
raw();
|
||||
noecho();
|
||||
pia->a = 0;
|
||||
pia->cra = 0;
|
||||
pia->b = 0;
|
||||
pia->crb = 0;
|
||||
}
|
||||
|
||||
void pia_trace(struct pia_t *pia, uint8_t trace) {
|
||||
pia->trace = trace;
|
||||
}
|
||||
|
||||
uint8_t pia_read(struct cpu_t *cpu, void *obj, uint16_t addr) {
|
||||
struct pia_t *pia = (struct pia_t*) obj;
|
||||
uint8_t result = 0;
|
||||
switch (addr) {
|
||||
case 0xd010: /* KBD */
|
||||
result = pia->a;
|
||||
break;
|
||||
case 0xd011: /* KBDCR */ {
|
||||
int c = getch();
|
||||
if (c != ERR) {
|
||||
/* TODO: Remove this, this is not how we want to stop the emulator */
|
||||
if (c == 3) {
|
||||
exit(1);
|
||||
}
|
||||
if (c == '\n') {
|
||||
c = '\r';
|
||||
}
|
||||
pia->a = c | 0x80;
|
||||
}
|
||||
result = (c == ERR) ? 0x00 : 0x80;
|
||||
break;
|
||||
}
|
||||
case 0xd012: /* DSP */
|
||||
result = 0;
|
||||
break;
|
||||
case 0xd013: /* DSPCR */
|
||||
result = 0;
|
||||
break;
|
||||
}
|
||||
if (pia->trace) {
|
||||
fprintf(stderr, "PIA: READ BYTE %.2X FROM %.4X\n", result, addr);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
void pia_write(struct cpu_t *cpu, void *obj, uint16_t addr, uint8_t b) {
|
||||
struct pia_t *pia = (struct pia_t*) obj;
|
||||
if (pia->trace) {
|
||||
fprintf(stderr, "PIA: WRITING BYTE %.2X TO %.4X\n", b, addr);
|
||||
}
|
||||
switch (addr) {
|
||||
case 0xd010: /* KBD */
|
||||
break;
|
||||
case 0xd011: /* KBDCR */
|
||||
pia->cra = b;
|
||||
break;
|
||||
case 0xd012: /* DSP */
|
||||
if (pia->crb != 0x00) { /* TODO: Check the actual flag */
|
||||
pia_dsp_write(b);
|
||||
}
|
||||
break;
|
||||
case 0xd013: /* DSPCR */
|
||||
pia->crb = b;
|
||||
break;
|
||||
}
|
||||
}
|
||||
42
pia.h
Normal file
42
pia.h
Normal file
|
|
@ -0,0 +1,42 @@
|
|||
// The MIT License (MIT)
|
||||
//
|
||||
// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all
|
||||
// copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
// SOFTWARE.
|
||||
|
||||
#ifndef PIA_H
|
||||
#define PIA_H
|
||||
|
||||
#include <stdint.h>
|
||||
#include "cpu.h"
|
||||
|
||||
struct pia_t {
|
||||
uint8_t a;
|
||||
uint8_t cra;
|
||||
uint8_t b;
|
||||
uint8_t crb;
|
||||
uint8_t trace;
|
||||
};
|
||||
|
||||
void pia_init(struct pia_t *pia);
|
||||
void pia_trace(struct pia_t *pia, uint8_t trace);
|
||||
uint8_t pia_read(struct cpu_t *cpu, void *obj, uint16_t addr);
|
||||
void pia_write(struct cpu_t *cpu, void *obj, uint16_t addr, uint8_t b);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user