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captain-amygdala.pistorm/emulator.c

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#include "m68k.h"
#include "emulator.h"
#include "platforms/platforms.h"
#include "input/input.h"
#include "platforms/amiga/Gayle.h"
#include "platforms/amiga/gayle-ide/ide.h"
#include "platforms/amiga/amiga-registers.h"
#include "platforms/amiga/rtg/rtg.h"
#include "platforms/amiga/hunk-reloc.h"
#include "platforms/amiga/piscsi/piscsi.h"
#include "platforms/amiga/piscsi/piscsi-enums.h"
#include "platforms/amiga/net/pi-net.h"
#include "platforms/amiga/net/pi-net-enums.h"
#include "gpio/ps_protocol.h"
#include <assert.h>
#include <dirent.h>
#include <endian.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define KEY_POLL_INTERVAL_MSEC 5000
unsigned char read_ranges;
unsigned int read_addr[8];
unsigned int read_upper[8];
unsigned char *read_data[8];
unsigned char write_ranges;
unsigned int write_addr[8];
unsigned int write_upper[8];
unsigned char *write_data[8];
int kb_hook_enabled = 0;
int mouse_hook_enabled = 0;
int cpu_emulation_running = 1;
uint8_t mouse_dx = 0, mouse_dy = 0;
uint8_t mouse_buttons = 0;
uint8_t mouse_extra = 0;
extern uint8_t gayle_int;
extern uint8_t gayle_ide_enabled;
extern uint8_t gayle_emulation_enabled;
extern uint8_t gayle_a4k_int;
extern volatile unsigned int *gpio;
extern volatile uint16_t srdata;
extern uint8_t realtime_graphics_debug;
uint8_t realtime_disassembly, int2_enabled = 0;
uint32_t do_disasm = 0, old_level;
char c = 0, c_code = 0, c_type = 0; // @todo temporary main/cpu_task scope workaround until input moved to a thread
uint32_t last_irq = 8, last_last_irq = 8;
char disasm_buf[4096];
#define KICKBASE 0xF80000
#define KICKSIZE 0x7FFFF
int mem_fd, mouse_fd = -1, keyboard_fd = -1;
int mem_fd_gpclk;
int irq;
int gayleirq;
#define MUSASHI_HAX
#ifdef MUSASHI_HAX
#include "m68kcpu.h"
extern m68ki_cpu_core m68ki_cpu;
extern int m68ki_initial_cycles;
extern int m68ki_remaining_cycles;
#define M68K_SET_IRQ(i) old_level = CPU_INT_LEVEL; \
CPU_INT_LEVEL = (i << 8); \
if(old_level != 0x0700 && CPU_INT_LEVEL == 0x0700) \
m68ki_cpu.nmi_pending = TRUE;
#define M68K_END_TIMESLICE m68ki_initial_cycles = GET_CYCLES(); \
SET_CYCLES(0);
#else
#define M68K_SET_IRQ m68k_set_irq
#define M68K_END_TIMESLICE m68k_end_timeslice()
#endif
#define NOP asm("nop"); asm("nop"); asm("nop"); asm("nop");
#define DEBUG_EMULATOR
#ifdef DEBUG_EMULATOR
#define DEBUG printf
#else
#define DEBUG(...)
#endif
// Configurable emulator options
unsigned int cpu_type = M68K_CPU_TYPE_68000;
unsigned int loop_cycles = 300, irq_status = 0;
struct emulator_config *cfg = NULL;
char keyboard_file[256] = "/dev/input/event1";
uint64_t trig_irq = 0, serv_irq = 0;
uint16_t irq_delay = 0;
void *ipl_task(void *args) {
printf("IPL thread running\n");
uint16_t old_irq = 0;
uint32_t value;
while (1) {
value = *(gpio + 13);
if (!(value & (1 << PIN_IPL_ZERO))) {
irq = 1;
old_irq = irq_delay;
//NOP
M68K_END_TIMESLICE;
NOP
//usleep(0);
}
else {
if (irq) {
if (old_irq) {
old_irq--;
}
else {
irq = 0;
}
M68K_END_TIMESLICE;
NOP
//usleep(0);
}
}
/*if (gayle_ide_enabled) {
if (((gayle_int & 0x80) || gayle_a4k_int) && (get_ide(0)->drive[0].intrq || get_ide(0)->drive[1].intrq)) {
//get_ide(0)->drive[0].intrq = 0;
gayleirq = 1;
M68K_END_TIMESLICE;
}
else
gayleirq = 0;
}*/
//usleep(0);
//NOP NOP
NOP NOP NOP NOP NOP NOP NOP NOP
//NOP NOP NOP NOP NOP NOP NOP NOP
//NOP NOP NOP NOP NOP NOP NOP NOP
/*NOP NOP NOP NOP NOP NOP NOP NOP
NOP NOP NOP NOP NOP NOP NOP NOP
NOP NOP NOP NOP NOP NOP NOP NOP*/
}
return args;
}
void *cpu_task() {
m68k_pulse_reset();
cpu_loop:
if (mouse_hook_enabled) {
get_mouse_status(&mouse_dx, &mouse_dy, &mouse_buttons, &mouse_extra);
}
if (realtime_disassembly && (do_disasm || cpu_emulation_running)) {
m68k_disassemble(disasm_buf, m68k_get_reg(NULL, M68K_REG_PC), cpu_type);
printf("REGA: 0:$%.8X 1:$%.8X 2:$%.8X 3:$%.8X 4:$%.8X 5:$%.8X 6:$%.8X 7:$%.8X\n", m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1), m68k_get_reg(NULL, M68K_REG_A2), m68k_get_reg(NULL, M68K_REG_A3), \
m68k_get_reg(NULL, M68K_REG_A4), m68k_get_reg(NULL, M68K_REG_A5), m68k_get_reg(NULL, M68K_REG_A6), m68k_get_reg(NULL, M68K_REG_A7));
printf("REGD: 0:$%.8X 1:$%.8X 2:$%.8X 3:$%.8X 4:$%.8X 5:$%.8X 6:$%.8X 7:$%.8X\n", m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1), m68k_get_reg(NULL, M68K_REG_D2), m68k_get_reg(NULL, M68K_REG_D3), \
m68k_get_reg(NULL, M68K_REG_D4), m68k_get_reg(NULL, M68K_REG_D5), m68k_get_reg(NULL, M68K_REG_D6), m68k_get_reg(NULL, M68K_REG_D7));
printf("%.8X (%.8X)]] %s\n", m68k_get_reg(NULL, M68K_REG_PC), (m68k_get_reg(NULL, M68K_REG_PC) & 0xFFFFFF), disasm_buf);
if (do_disasm)
do_disasm--;
m68k_execute(1);
}
else {
if (cpu_emulation_running)
m68k_execute(loop_cycles);
}
if (irq) {
while (irq) {
last_irq = ((read_reg() & 0xe000) >> 13);
if (last_irq != last_last_irq) {
last_last_irq = last_irq;
M68K_SET_IRQ(last_irq);
}
m68k_execute(5);
}
if (gayleirq && int2_enabled) {
write16(0xdff09c, 0x8000 | (1 << 3) && last_irq != 2);
last_last_irq = last_irq;
last_irq = 2;
M68K_SET_IRQ(2);
}
M68K_SET_IRQ(0);
last_last_irq = 0;
m68k_execute(5);
}
/*else {
if (last_irq != 0) {
M68K_SET_IRQ(0);
last_last_irq = last_irq;
last_irq = 0;
}
}*/
if (mouse_hook_enabled && (mouse_extra != 0x00)) {
// mouse wheel events have occurred; unlike l/m/r buttons, these are queued as keypresses, so add to end of buffer
switch (mouse_extra) {
case 0xff:
// wheel up
queue_keypress(0xfe, KEYPRESS_PRESS, PLATFORM_AMIGA);
break;
case 0x01:
// wheel down
queue_keypress(0xff, KEYPRESS_PRESS, PLATFORM_AMIGA);
break;
}
// dampen the scroll wheel until next while loop iteration
mouse_extra = 0x00;
}
goto cpu_loop;
stop_cpu_emulation:
printf("[CPU] End of CPU thread\n");
}
void *keyboard_task() {
struct pollfd kbdfd[1];
int kpoll;
printf("[KBD] Keyboard thread started\n");
kbdfd[0].fd = keyboard_fd;
kbdfd[0].events = POLLIN;
key_loop:
kpoll = poll(kbdfd, 1, KEY_POLL_INTERVAL_MSEC);
if ((kpoll > 0) && (kbdfd[0].revents & POLLHUP)) {
// in the event that a keyboard is unplugged, keyboard_task will whiz up to 100% utilisation
// this is undesired, so if the keyboard HUPs, end the thread without ending the emulation
printf("[KBD] Keyboard node returned HUP (unplugged?)\n");
goto key_end;
}
// if kpoll > 0 then it contains number of events to pull, also check if POLLIN is set in revents
if ((kpoll <= 0) || !(kbdfd[0].revents & POLLIN)) {
goto key_loop;
}
while (get_key_char(&c, &c_code, &c_type)) {
if (c && c == cfg->keyboard_toggle_key && !kb_hook_enabled) {
kb_hook_enabled = 1;
printf("Keyboard hook enabled.\n");
}
else if (kb_hook_enabled) {
if (c == 0x1B && c_type) {
kb_hook_enabled = 0;
printf("Keyboard hook disabled.\n");
}
else {
if (queue_keypress(c_code, c_type, cfg->platform->id) && int2_enabled && last_irq != 2) {
//last_irq = 0;
//M68K_SET_IRQ(2);
}
}
}
// pause pressed; trigger nmi (int level 7)
if (c == 0x01 && c_type) {
printf("[INT] Sending NMI\n");
M68K_SET_IRQ(7);
}
if (!kb_hook_enabled && c_type) {
if (c && c == cfg->mouse_toggle_key) {
mouse_hook_enabled ^= 1;
printf("Mouse hook %s.\n", mouse_hook_enabled ? "enabled" : "disabled");
mouse_dx = mouse_dy = mouse_buttons = mouse_extra = 0;
}
if (c == 'r') {
cpu_emulation_running ^= 1;
printf("CPU emulation is now %s\n", cpu_emulation_running ? "running" : "stopped");
}
if (c == 'g') {
realtime_graphics_debug ^= 1;
printf("Real time graphics debug is now %s\n", realtime_graphics_debug ? "on" : "off");
}
if (c == 'R') {
cpu_pulse_reset();
//m68k_pulse_reset();
printf("CPU emulation reset.\n");
}
// @todo work out how to signal the main process that we want to quit
// if (c == 'q') {
// printf("Quitting and exiting emulator.\n");
// goto stop_cpu_emulation;
// }
if (c == 'd') {
realtime_disassembly ^= 1;
do_disasm = 1;
printf("Real time disassembly is now %s\n", realtime_disassembly ? "on" : "off");
}
if (c == 'D') {
int r = get_mapped_item_by_address(cfg, 0x08000000);
if (r != -1) {
printf("Dumping first 16MB of mapped range %d.\n", r);
FILE *dmp = fopen("./memdmp.bin", "wb+");
fwrite(cfg->map_data[r], 16 * SIZE_MEGA, 1, dmp);
fclose(dmp);
}
}
if (c == 's' && realtime_disassembly) {
do_disasm = 1;
}
if (c == 'S' && realtime_disassembly) {
do_disasm = 128;
}
}
}
goto key_loop;
key_end:
printf("[KBD] Keyboard thread ending\n");
}
void stop_cpu_emulation(uint8_t disasm_cur) {
M68K_END_TIMESLICE;
if (disasm_cur) {
m68k_disassemble(disasm_buf, m68k_get_reg(NULL, M68K_REG_PC), cpu_type);
printf("REGA: 0:$%.8X 1:$%.8X 2:$%.8X 3:$%.8X 4:$%.8X 5:$%.8X 6:$%.8X 7:$%.8X\n", m68k_get_reg(NULL, M68K_REG_A0), m68k_get_reg(NULL, M68K_REG_A1), m68k_get_reg(NULL, M68K_REG_A2), m68k_get_reg(NULL, M68K_REG_A3), \
m68k_get_reg(NULL, M68K_REG_A4), m68k_get_reg(NULL, M68K_REG_A5), m68k_get_reg(NULL, M68K_REG_A6), m68k_get_reg(NULL, M68K_REG_A7));
printf("REGD: 0:$%.8X 1:$%.8X 2:$%.8X 3:$%.8X 4:$%.8X 5:$%.8X 6:$%.8X 7:$%.8X\n", m68k_get_reg(NULL, M68K_REG_D0), m68k_get_reg(NULL, M68K_REG_D1), m68k_get_reg(NULL, M68K_REG_D2), m68k_get_reg(NULL, M68K_REG_D3), \
m68k_get_reg(NULL, M68K_REG_D4), m68k_get_reg(NULL, M68K_REG_D5), m68k_get_reg(NULL, M68K_REG_D6), m68k_get_reg(NULL, M68K_REG_D7));
printf("%.8X (%.8X)]] %s\n", m68k_get_reg(NULL, M68K_REG_PC), (m68k_get_reg(NULL, M68K_REG_PC) & 0xFFFFFF), disasm_buf);
realtime_disassembly = 1;
}
cpu_emulation_running = 0;
do_disasm = 0;
}
unsigned int ovl;
static volatile unsigned char maprom;
void sigint_handler(int sig_num) {
//if (sig_num) { }
//cpu_emulation_running = 0;
//return;
printf("Received sigint %d, exiting.\n", sig_num);
if (mouse_fd != -1)
close(mouse_fd);
if (mem_fd)
close(mem_fd);
if (cfg->platform->shutdown) {
cfg->platform->shutdown(cfg);
}
printf("IRQs triggered: %lld\n", trig_irq);
printf("IRQs serviced: %lld\n", serv_irq);
exit(0);
}
int main(int argc, char *argv[]) {
int g;
//const struct sched_param priority = {99};
if (argc > 1) {
irq_delay = atoi(argv[1]);
printf("Setting IRQ delay to %d loops (%s).\n", irq_delay, argv[1]);
}
// Some command line switch stuffles
for (g = 1; g < argc; g++) {
if (strcmp(argv[g], "--cpu_type") == 0 || strcmp(argv[g], "--cpu") == 0) {
if (g + 1 >= argc) {
printf("%s switch found, but no CPU type specified.\n", argv[g]);
} else {
g++;
cpu_type = get_m68k_cpu_type(argv[g]);
}
}
else if (strcmp(argv[g], "--config-file") == 0 || strcmp(argv[g], "--config") == 0) {
if (g + 1 >= argc) {
printf("%s switch found, but no config filename specified.\n", argv[g]);
} else {
g++;
cfg = load_config_file(argv[g]);
}
}
else if (strcmp(argv[g], "--keyboard-file") == 0 || strcmp(argv[g], "--kbfile") == 0) {
if (g + 1 >= argc) {
printf("%s switch found, but no keyboard device path specified.\n", argv[g]);
} else {
g++;
strcpy(keyboard_file, argv[g]);
}
}
}
if (!cfg) {
printf("No config file specified. Trying to load default.cfg...\n");
cfg = load_config_file("default.cfg");
if (!cfg) {
printf("Couldn't load default.cfg, empty emulator config will be used.\n");
cfg = (struct emulator_config *)calloc(1, sizeof(struct emulator_config));
if (!cfg) {
printf("Failed to allocate memory for emulator config!\n");
return 1;
}
memset(cfg, 0x00, sizeof(struct emulator_config));
}
}
if (cfg) {
if (cfg->cpu_type) cpu_type = cfg->cpu_type;
if (cfg->loop_cycles) loop_cycles = cfg->loop_cycles;
if (!cfg->platform)
cfg->platform = make_platform_config("none", "generic");
cfg->platform->platform_initial_setup(cfg);
}
if (cfg->mouse_enabled) {
mouse_fd = open(cfg->mouse_file, O_RDWR | O_NONBLOCK);
if (mouse_fd == -1) {
printf("Failed to open %s, can't enable mouse hook.\n", cfg->mouse_file);
cfg->mouse_enabled = 0;
} else {
/**
* *-*-*-* magic numbers! *-*-*-*
* great, so waaaay back in the history of the pc, the ps/2 protocol set the standard for mice
* and in the process, the mouse sample rate was defined as a way of putting mice into vendor-specific modes.
* as the ancient gpm command explains, almost everything except incredibly old mice talk the IntelliMouse
* protocol, which reports four bytes. by default, every mouse starts in 3-byte mode (don't report wheel or
* additional buttons) until imps2 magic is sent. so, command $f3 is "set sample rate", followed by a byte.
*/
uint8_t mouse_init[] = { 0xf4, 0xf3, 0x64 }; // enable, then set sample rate 100
uint8_t imps2_init[] = { 0xf3, 0xc8, 0xf3, 0x64, 0xf3, 0x50 }; // magic sequence; set sample 200, 100, 80
if (write(mouse_fd, mouse_init, sizeof(mouse_init)) != -1) {
if (write(mouse_fd, imps2_init, sizeof(imps2_init)) == -1)
printf("[MOUSE] Couldn't enable scroll wheel events; is this mouse from the 1980s?\n");
} else
printf("[MOUSE] Mouse didn't respond to normal PS/2 init; have you plugged a brick in by mistake?\n");
}
}
keyboard_fd = open(keyboard_file, O_RDONLY | O_NONBLOCK);
if (keyboard_fd == -1) {
printf("Failed to open keyboard event source.\n");
}
InitGayle();
signal(SIGINT, sigint_handler);
/*setup_io();
//goto skip_everything;
// Enable 200MHz CLK output on GPIO4, adjust divider and pll source depending
// on pi model
printf("Enable 200MHz GPCLK0 on GPIO4\n");
gpio_enable_200mhz();
// reset cpld statemachine first
write_reg(0x01);
usleep(100);
usleep(1500);
write_reg(0x00);
usleep(100);
// reset amiga and statemachine
skip_everything:;
usleep(1500);
m68k_init();
printf("Setting CPU type to %d.\n", cpu_type);
m68k_set_cpu_type(cpu_type);
cpu_pulse_reset();
if (maprom == 1) {
m68k_set_reg(M68K_REG_PC, 0xF80002);
} else {
m68k_set_reg(M68K_REG_PC, 0x0);
}*/
ps_setup_protocol();
ps_reset_state_machine();
ps_pulse_reset();
usleep(1500);
m68k_init();
printf("Setting CPU type to %d.\n", cpu_type);
m68k_set_cpu_type(cpu_type);
cpu_pulse_reset();
pthread_t ipl_tid, cpu_tid, kbd_tid;
int err;
err = pthread_create(&ipl_tid, NULL, &ipl_task, NULL);
if (err != 0)
printf("[ERROR] Cannot create IPL thread: [%s]", strerror(err));
else {
pthread_setname_np(ipl_tid, "pistorm: ipl");
printf("IPL thread created successfully\n");
}
// create keyboard task
err = pthread_create(&kbd_tid, NULL, &keyboard_task, NULL);
if (err != 0)
printf("[ERROR] Cannot create keyboard thread: [%s]", strerror(err));
else {
pthread_setname_np(kbd_tid, "pistorm: kbd");
printf("[MAIN] Keyboard thread created successfully\n");
}
// create cpu task
err = pthread_create(&cpu_tid, NULL, &cpu_task, NULL);
if (err != 0)
printf("[ERROR] Cannot create CPU thread: [%s]", strerror(err));
else {
pthread_setname_np(cpu_tid, "pistorm: cpu");
printf("[MAIN] CPU thread created successfully\n");
}
// wait for cpu task to end before closing up and finishing
pthread_join(cpu_tid, NULL);
printf("[MAIN] All threads appear to have concluded; ending process\n");
if (mouse_fd != -1)
close(mouse_fd);
if (mem_fd)
close(mem_fd);
return 0;
}
void cpu_pulse_reset(void) {
ps_pulse_reset();
//write_reg(0x00);
// printf("Status Reg%x\n",read_reg());
//usleep(100000);
//write_reg(0x02);
// printf("Status Reg%x\n",read_reg());
if (cfg->platform->handle_reset)
cfg->platform->handle_reset(cfg);
//m68k_write_memory_16(INTENA, 0x7FFF);
ovl = 1;
m68k_write_memory_8(0xbfe201, 0x0001); // AMIGA OVL
m68k_write_memory_8(0xbfe001, 0x0001); // AMIGA OVL high (ROM@0x0)
m68k_pulse_reset();
}
int cpu_irq_ack(int level) {
printf("cpu irq ack\n");
return level;
}
static unsigned int target = 0;
static uint8_t send_keypress = 0;
uint8_t cdtv_dmac_reg_idx_read();
void cdtv_dmac_reg_idx_write(uint8_t value);
uint32_t cdtv_dmac_read(uint32_t address, uint8_t type);
void cdtv_dmac_write(uint32_t address, uint32_t value, uint8_t type);
#define PLATFORM_CHECK_READ(a) \
if (address >= cfg->custom_low && address < cfg->custom_high) { \
unsigned int target = 0; \
switch(cfg->platform->id) { \
case PLATFORM_AMIGA: { \
if (address >= PISCSI_OFFSET && address < PISCSI_UPPER) { \
return handle_piscsi_read(address, a); \
} \
if (address >= PINET_OFFSET && address < PINET_UPPER) { \
return handle_pinet_read(address, a); \
} \
if (address >= PIGFX_RTG_BASE && address < PIGFX_UPPER) { \
return rtg_read((address & 0x0FFFFFFF), a); \
} \
if (custom_read_amiga(cfg, address, &target, a) != -1) { \
return target; \
} \
break; \
} \
default: \
break; \
} \
} \
if (ovl || (address >= cfg->mapped_low && address < cfg->mapped_high)) { \
if (handle_mapped_read(cfg, address, &target, a) != -1) \
return target; \
}
unsigned int m68k_read_memory_8(unsigned int address) {
PLATFORM_CHECK_READ(OP_TYPE_BYTE);
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("BYTE read from DMAC @%.8X:", address);
uint32_t v = cdtv_dmac_read(address & 0xFFFF, OP_TYPE_BYTE);
printf("%.2X\n", v);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return v;
}*/
/*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x080032F0 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x080032F0 + 0x4000) {
stop_cpu_emulation(1);
}*/
if (address & 0xFF000000)
return 0;
unsigned char result = (unsigned int)read8((uint32_t)address);
if (mouse_hook_enabled) {
if (address == CIAAPRA) {
if (mouse_buttons & 0x01) {
//mouse_buttons -= 1;
return (unsigned int)(result ^ 0x40);
}
return (unsigned int)result;
}
}
if (kb_hook_enabled) {
if (address == CIAAICR) {
if (get_num_kb_queued() && (!send_keypress || send_keypress == 1)) {
result |= 0x08;
if (!send_keypress)
send_keypress = 1;
}
if (send_keypress == 2) {
//result |= 0x02;
send_keypress = 0;
}
return result;
}
if (address == CIAADAT) {
//if (send_keypress) {
uint8_t c = 0, t = 0;
pop_queued_key(&c, &t);
t ^= 0x01;
result = ((c << 1) | t) ^ 0xFF;
send_keypress = 2;
//M68K_SET_IRQ(0);
//}
return result;
}
}
return result;
}
unsigned int m68k_read_memory_16(unsigned int address) {
PLATFORM_CHECK_READ(OP_TYPE_WORD);
/*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x080032F0 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x080032F0 + 0x4000) {
stop_cpu_emulation(1);
}*/
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("WORD read from DMAC @%.8X:", address);
uint32_t v = cdtv_dmac_read(address & 0xFFFF, OP_TYPE_WORD);
printf("%.2X\n", v);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return v;
}*/
if (mouse_hook_enabled) {
if (address == JOY0DAT) {
// Forward mouse valueses to Amyga.
unsigned short result = (mouse_dy << 8) | (mouse_dx);
return (unsigned int)result;
}
/*if (address == CIAAPRA) {
unsigned short result = (unsigned int)read16((uint32_t)address);
if (mouse_buttons & 0x01) {
return (unsigned int)(result | 0x40);
}
else
return (unsigned int)result;
}*/
if (address == POTGOR) {
unsigned short result = (unsigned int)read16((uint32_t)address);
// bit 1 rmb, bit 2 mmb
if (mouse_buttons & 0x06) {
return (unsigned int)((result ^ ((mouse_buttons & 0x02) << 9)) // move rmb to bit 10
& (result ^ ((mouse_buttons & 0x04) << 6))); // move mmb to bit 8
}
return (unsigned int)(result & 0xfffd);
}
}
if (address & 0xFF000000)
return 0;
if (address & 0x01) {
return ((read8(address) << 8) | read8(address + 1));
}
return (unsigned int)read16((uint32_t)address);
}
unsigned int m68k_read_memory_32(unsigned int address) {
PLATFORM_CHECK_READ(OP_TYPE_LONGWORD);
/*if (m68k_get_reg(NULL, M68K_REG_PC) >= 0x080032F0 && m68k_get_reg(NULL, M68K_REG_PC) <= 0x080032F0 + 0x4000) {
stop_cpu_emulation(1);
}*/
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("LONGWORD read from DMAC @%.8X:", address);
uint32_t v = cdtv_dmac_read(address & 0xFFFF, OP_TYPE_LONGWORD);
printf("%.2X\n", v);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return v;
}*/
if (address & 0xFF000000)
return 0;
if (address & 0x01) {
uint32_t c = read8(address);
c |= (be16toh(read16(address+1)) << 8);
c |= (read8(address + 3) << 24);
return htobe32(c);
}
uint16_t a = read16(address);
uint16_t b = read16(address + 2);
return (a << 16) | b;
}
#define PLATFORM_CHECK_WRITE(a) \
if (address >= cfg->custom_low && address < cfg->custom_high) { \
switch(cfg->platform->id) { \
case PLATFORM_AMIGA: { \
if (address >= PISCSI_OFFSET && address < PISCSI_UPPER) { \
handle_piscsi_write(address, value, a); \
} \
if (address >= PINET_OFFSET && address < PINET_UPPER) { \
handle_pinet_write(address, value, a); \
} \
if (address >= PIGFX_RTG_BASE && address < PIGFX_UPPER) { \
rtg_write((address & 0x0FFFFFFF), value, a); \
return; \
} \
if (custom_write_amiga(cfg, address, value, a) != -1) { \
return; \
} \
break; \
} \
default: \
break; \
} \
} \
if (address >= cfg->mapped_low && address < cfg->mapped_high) { \
if (handle_mapped_write(cfg, address, value, a) != -1) \
return; \
}
void m68k_write_memory_8(unsigned int address, unsigned int value) {
PLATFORM_CHECK_WRITE(OP_TYPE_BYTE);
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("BYTE write to DMAC @%.8X: %.2X\n", address, value);
cdtv_dmac_write(address & 0xFFFF, value, OP_TYPE_BYTE);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return;
}*/
if (address == 0xbfe001) {
if (ovl != (value & (1 << 0))) {
ovl = (value & (1 << 0));
printf("OVL:%x\n", ovl);
}
}
if (address & 0xFF000000)
return;
write8((uint32_t)address, value);
return;
}
void m68k_write_memory_16(unsigned int address, unsigned int value) {
PLATFORM_CHECK_WRITE(OP_TYPE_WORD);
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("WORD write to DMAC @%.8X: %.4X\n", address, value);
cdtv_dmac_write(address & 0xFFFF, value, OP_TYPE_WORD);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return;
}*/
if (address == 0xDFF030) {
char *serdat = (char *)&value;
// SERDAT word. see amiga dev docs appendix a; upper byte is control codes, and bit 0 is always 1.
// ignore this upper byte as it's not viewable data, only display lower byte.
printf("%c", serdat[0]);
}
if (address == 0xDFF09A) {
if (!(value & 0x8000)) {
if (value & 0x04) {
int2_enabled = 0;
}
}
else if (value & 0x04) {
int2_enabled = 1;
}
}
if (address & 0xFF000000)
return;
if (address & 0x01)
printf("Unaligned WORD write!\n");
write16((uint32_t)address, value);
return;
}
void m68k_write_memory_32(unsigned int address, unsigned int value) {
PLATFORM_CHECK_WRITE(OP_TYPE_LONGWORD);
/*if (address >= 0xE90000 && address < 0xF00000) {
printf("LONGWORD write to DMAC @%.8X: %.8X\n", address, value);
cdtv_dmac_write(address & 0xFFFF, value, OP_TYPE_LONGWORD);
M68K_END_TIMESLICE;
cpu_emulation_running = 0;
return;
}*/
if (address & 0xFF000000)
return;
if (address & 0x01)
printf("Unaligned LONGWORD write!\n");
write16(address, value >> 16);
write16(address + 2, value);
return;
}
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