src/Unix/main_unix.cpp

/*
 *  main_unix.cpp - Startup code for Unix
 *
 *  Basilisk II (C) 1997-2000 Christian Bauer
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "sysdeps.h"

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <X11/Xlib.h>

#ifdef HAVE_PTHREADS
# include <pthread.h>
#endif

#if defined(USE_MAPPED_MEMORY) || REAL_ADDRESSING || DIRECT_ADDRESSING
# include <sys/mman.h>
#endif

#if !EMULATED_68K && defined(__NetBSD__)
# include <m68k/sync_icache.h> 
# include <m68k/frame.h>
# include <sys/param.h>
# include <sys/sysctl.h>
struct sigstate {
        int ss_flags;
        struct frame ss_frame;
        struct fpframe ss_fpstate;
};
# define SS_FPSTATE  0x02
# define SS_USERREGS 0x04
#endif

#ifdef ENABLE_GTK
# include <gtk/gtk.h>
#endif

#ifdef ENABLE_XF86_DGA
# include <X11/Xutil.h>
# include <X11/extensions/xf86dga.h>
#endif

#include "cpu_emulation.h"
#include "sys.h"
#include "rom_patches.h"
#include "xpram.h"
#include "timer.h"
#include "video.h"
#include "emul_op.h"
#include "prefs.h"
#include "prefs_editor.h"
#include "macos_util.h"
#include "user_strings.h"
#include "version.h"
#include "main.h"

#ifdef ENABLE_MON
# include "mon.h"
#endif

#define DEBUG 0
#include "debug.h"


// Constants
const char ROM_FILE_NAME[] = "ROM";
const int SIG_STACK_SIZE = SIGSTKSZ;    // Size of signal stack
const int SCRATCH_MEM_SIZE = 0x10000;   // Size of scratch memory area


#if !EMULATED_68K
// RAM and ROM pointers
uint32 RAMBaseMac;              // RAM base (Mac address space)
uint8 *RAMBaseHost;             // RAM base (host address space)
uint32 RAMSize;                 // Size of RAM
uint32 ROMBaseMac;              // ROM base (Mac address space)
uint8 *ROMBaseHost;             // ROM base (host address space)
uint32 ROMSize;                 // Size of ROM
#endif


// CPU and FPU type, addressing mode
int CPUType;
bool CPUIs68060;
int FPUType;
bool TwentyFourBitAddressing;


// Global variables
char *x_display_name = NULL;                                            // X11 display name
Display *x_display = NULL;                                                      // X11 display handle

static int zero_fd = -1;                                                        // FD of /dev/zero
static uint8 last_xpram[256];                                           // Buffer for monitoring XPRAM changes

#ifdef HAVE_PTHREADS
static pthread_t emul_thread;                                           // Handle of MacOS emulation thread (main thread)

static bool xpram_thread_active = false;                        // Flag: XPRAM watchdog installed
static volatile bool xpram_thread_cancel = false;       // Flag: Cancel XPRAM thread
static pthread_t xpram_thread;                                          // XPRAM watchdog

static bool tick_thread_active = false;                         // Flag: 60Hz thread installed
static volatile bool tick_thread_cancel = false;        // Flag: Cancel 60Hz thread
static pthread_t tick_thread;                                           // 60Hz thread
static pthread_attr_t tick_thread_attr;                         // 60Hz thread attributes

#if EMULATED_68K
static pthread_mutex_t intflag_lock = PTHREAD_MUTEX_INITIALIZER;        // Mutex to protect InterruptFlags
#endif
#endif

#if !EMULATED_68K
#define SIG_IRQ SIGUSR1
static struct sigaction sigirq_sa;      // Virtual 68k interrupt signal
static struct sigaction sigill_sa;      // Illegal instruction
static void *sig_stack = NULL;          // Stack for signal handlers
uint16 EmulatedSR;                                      // Emulated bits of SR (supervisor bit and interrupt mask)
#endif

#if USE_SCRATCHMEM_SUBTERFUGE
uint8 *ScratchMem = NULL;                       // Scratch memory for Mac ROM writes
#endif

static struct sigaction timer_sa;       // sigaction used for timer

#if defined(HAVE_TIMER_CREATE) && defined(_POSIX_REALTIME_SIGNALS)
#define SIG_TIMER SIGRTMIN
static timer_t timer;                           // 60Hz timer
#endif

#ifdef ENABLE_MON
static struct sigaction sigint_sa;      // sigaction for SIGINT handler
static void sigint_handler(...);
#endif

#if REAL_ADDRESSING
static bool lm_area_mapped = false;     // Flag: Low Memory area mmap()ped
static bool memory_mapped_from_zero = false; // Flag: Could allocate RAM area from 0
#endif

#if REAL_ADDRESSING || DIRECT_ADDRESSING
static uint32 mapped_ram_rom_size;              // Total size of mmap()ed RAM/ROM area
#endif

#ifdef USE_MAPPED_MEMORY
extern char *address_space, *good_address_map;
#endif


// Prototypes
static void *xpram_func(void *arg);
static void *tick_func(void *arg);
static void one_tick(...);
#if !EMULATED_68K
static void sigirq_handler(int sig, int code, struct sigcontext *scp);
static void sigill_handler(int sig, int code, struct sigcontext *scp);
extern "C" void EmulOpTrampoline(void);
#endif


/*
 *  Ersatz functions
 */

extern "C" {

#ifndef HAVE_STRDUP
char *strdup(const char *s)
{
        char *n = (char *)malloc(strlen(s) + 1);
        strcpy(n, s);
        return n;
}
#endif

}


/*
 *  Main program
 */

int main(int argc, char **argv)
{
        char str[256];

        // Initialize variables
        RAMBaseHost = NULL;
        ROMBaseHost = NULL;
        srand(time(NULL));
        tzset();

        // Print some info
        printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
        printf(" %s\n", GetString(STR_ABOUT_TEXT2));

        // Parse arguments
        for (int i=1; i<argc; i++) {
                if (strcmp(argv[i], "-display") == 0 && ++i < argc)
                        x_display_name = argv[i];
                else if (strcmp(argv[i], "-break") == 0 && ++i < argc)
                        ROMBreakpoint = strtol(argv[i], NULL, 0);
                else if (strcmp(argv[i], "-rominfo") == 0)
                        PrintROMInfo = true;
        }

        // Open display
        x_display = XOpenDisplay(x_display_name);
        if (x_display == NULL) {
                char str[256];
                sprintf(str, GetString(STR_NO_XSERVER_ERR), XDisplayName(x_display_name));
                ErrorAlert(str);
                QuitEmulator();
        }

#if defined(ENABLE_XF86_DGA) && !defined(ENABLE_MON)
        // Fork out, so we can return from fullscreen mode when things get ugly
        XF86DGAForkApp(DefaultScreen(x_display));
#endif

#ifdef ENABLE_GTK
        // Init GTK
        gtk_set_locale();
        gtk_init(&argc, &argv);
#endif

        // Read preferences
        PrefsInit();

        // Init system routines
        SysInit();

        // Show preferences editor
        if (!PrefsFindBool("nogui"))
                if (!PrefsEditor())
                        QuitEmulator();

        // Open /dev/zero
        zero_fd = open("/dev/zero", O_RDWR);
        if (zero_fd < 0) {
                sprintf(str, GetString(STR_NO_DEV_ZERO_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }

        // Read RAM size
        RAMSize = PrefsFindInt32("ramsize") & 0xfff00000;       // Round down to 1MB boundary
        if (RAMSize < 1024*1024) {
                WarningAlert(GetString(STR_SMALL_RAM_WARN));
                RAMSize = 1024*1024;
        }

#if REAL_ADDRESSING || DIRECT_ADDRESSING
        const uint32 page_size = getpagesize();
        const uint32 page_mask = page_size - 1;
        const uint32 aligned_ram_size = (RAMSize + page_mask) & ~page_mask;
        mapped_ram_rom_size = aligned_ram_size + 0x100000;
#endif

#if REAL_ADDRESSING
        // Try to allocate the complete address space from zero
        // gb-- the Solaris manpage about mmap(2) states that using MAP_FIXED
        // implies undefined behaviour for further use of sbrk(), malloc(), etc.
        // cebix-- on NetBSD/m68k, this causes a segfault
#if defined(OS_solaris) || defined(OS_netbsd)
        // Anyway, it doesn't work...
        if (0) {
#else
        if (mmap((caddr_t)0x0000, mapped_ram_rom_size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, zero_fd, 0) != MAP_FAILED) {
#endif
                D(bug("Could allocate RAM and ROM from 0x0000\n"));
                memory_mapped_from_zero = true;
        }
        // Create Low Memory area (0x0000..0x2000)
        else if (mmap((char *)0x0000, 0x2000, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, zero_fd, 0) != MAP_FAILED) {
                D(bug("Could allocate the Low Memory globals\n"));
                lm_area_mapped = true;
        }
        // Exit on error
        else {
                sprintf(str, GetString(STR_LOW_MEM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
#endif

#if USE_SCRATCHMEM_SUBTERFUGE
        // Allocate scratch memory
        ScratchMem = (uint8 *)malloc(SCRATCH_MEM_SIZE);
        if (ScratchMem == NULL) {
                ErrorAlert(GetString(STR_NO_MEM_ERR));
                QuitEmulator();
        }
        ScratchMem += SCRATCH_MEM_SIZE/2;       // ScratchMem points to middle of block
#endif

        // Create areas for Mac RAM and ROM
#if defined(USE_MAPPED_MEMORY)
    good_address_map = (char *)mmap(NULL, 1<<24, PROT_READ, MAP_PRIVATE, zero_fd, 0);
    address_space = (char *)mmap(NULL, 1<<24, PROT_READ | PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
    if ((int)address_space < 0 || (int)good_address_map < 0) {
                ErrorAlert(GetString(STR_NOT_ENOUGH_MEMORY_ERR));
                QuitEmulator();
    }
    RAMBaseHost = (uint8 *)mmap(address_space, RAMSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, zero_fd, 0);
    ROMBaseHost = (uint8 *)mmap(address_space + 0x00400000, 0x80000, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FIXED, zero_fd, 0);
        char *nam = tmpnam(NULL);
    int good_address_fd = open(nam, O_CREAT | O_RDWR, 0600);
        char buffer[4096];
    memset(buffer, 1, sizeof(buffer));
    write(good_address_fd, buffer, sizeof(buffer));
    unlink(nam);
    for (int i=0; i<RAMSize; i+=4096)
        mmap(good_address_map + i, 4096, PROT_READ, MAP_FIXED | MAP_PRIVATE, good_address_fd, 0);
    for (int i=0; i<0x80000; i+=4096)
        mmap(good_address_map + i + 0x00400000, 4096, PROT_READ, MAP_FIXED | MAP_PRIVATE, good_address_fd, 0);
#elif REAL_ADDRESSING || DIRECT_ADDRESSING
        // gb-- Overkill, needs to be cleaned up. Probably explode it for either
        // real or direct addressing mode.
#if REAL_ADDRESSING
        if (memory_mapped_from_zero) {
                RAMBaseHost = (uint8 *)0;
                ROMBaseHost = RAMBaseHost + aligned_ram_size;
        }
        else
#endif
        {
                RAMBaseHost = (uint8 *)mmap(0, mapped_ram_rom_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
                if (RAMBaseHost == (uint8 *)MAP_FAILED) {
                        ErrorAlert(GetString(STR_NO_MEM_ERR));
                        QuitEmulator();
                }
                ROMBaseHost = RAMBaseHost + aligned_ram_size;
        }
#else
        RAMBaseHost = (uint8 *)malloc(RAMSize);
        ROMBaseHost = (uint8 *)malloc(0x100000);
        if (RAMBaseHost == NULL || ROMBaseHost == NULL) {
                ErrorAlert(GetString(STR_NO_MEM_ERR));
                QuitEmulator();
        }
#endif

#if DIRECT_ADDRESSING
        // Initialize MEMBaseDiff now so that Host2MacAddr in the Video module
        // will return correct results
        RAMBaseMac = 0;
        ROMBaseMac = RAMBaseMac + aligned_ram_size;
        InitMEMBaseDiff(RAMBaseHost, RAMBaseMac);
#endif
#if REAL_ADDRESSING // && !EMULATED_68K
        RAMBaseMac = (uint32)RAMBaseHost;
        ROMBaseMac = (uint32)ROMBaseHost;
#endif
        D(bug("Mac RAM starts at %p (%08x)\n", RAMBaseHost, RAMBaseMac));
        D(bug("Mac ROM starts at %p (%08x)\n", ROMBaseHost, ROMBaseMac));
        
        // Get rom file path from preferences
        const char *rom_path = PrefsFindString("rom");

        // Load Mac ROM
        int rom_fd = open(rom_path ? rom_path : ROM_FILE_NAME, O_RDONLY);
        if (rom_fd < 0) {
                ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
                QuitEmulator();
        }
        printf(GetString(STR_READING_ROM_FILE));
        ROMSize = lseek(rom_fd, 0, SEEK_END);
        if (ROMSize != 64*1024 && ROMSize != 128*1024 && ROMSize != 256*1024 && ROMSize != 512*1024 && ROMSize != 1024*1024) {
                ErrorAlert(GetString(STR_ROM_SIZE_ERR));
                close(rom_fd);
                QuitEmulator();
        }
        lseek(rom_fd, 0, SEEK_SET);
        if (read(rom_fd, ROMBaseHost, ROMSize) != (ssize_t)ROMSize) {
                ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
                close(rom_fd);
                QuitEmulator();
        }

#if !EMULATED_68K
        // Get CPU model
        int mib[2] = {CTL_HW, HW_MODEL};
        char *model;
        size_t model_len;
        sysctl(mib, 2, NULL, &model_len, NULL, 0);
        model = (char *)malloc(model_len);
        sysctl(mib, 2, model, &model_len, NULL, 0);
        D(bug("Model: %s\n", model));

        // Set CPU and FPU type
        CPUIs68060 = false;
        if (strstr(model, "020"))
                CPUType = 2;
        else if (strstr(model, "030"))
                CPUType = 3;
        else if (strstr(model, "040"))
                CPUType = 4;
        else if (strstr(model, "060")) {
                CPUType = 4;
                CPUIs68060 = true;
        } else {
                printf("WARNING: Cannot detect CPU type, assuming 68020\n");
                CPUType = 2;
        }
        FPUType = 1;    // NetBSD has an FPU emulation, so the FPU ought to be available at all times
        TwentyFourBitAddressing = false;
#endif

        // Initialize everything
        if (!InitAll())
                QuitEmulator();
        D(bug("Initialization complete\n"));

#ifdef HAVE_PTHREADS
        // Get handle of main thread
        emul_thread = pthread_self();
#endif

#if !EMULATED_68K
        // (Virtual) supervisor mode, disable interrupts
        EmulatedSR = 0x2700;

        // Create and install stack for signal handlers
        sig_stack = malloc(SIG_STACK_SIZE);
        D(bug("Signal stack at %p\n", sig_stack));
        if (sig_stack == NULL) {
                ErrorAlert(GetString(STR_NOT_ENOUGH_MEMORY_ERR));
                QuitEmulator();
        }
        stack_t new_stack;
        new_stack.ss_sp = sig_stack;
        new_stack.ss_flags = 0;
        new_stack.ss_size = SIG_STACK_SIZE;
        if (sigaltstack(&new_stack, NULL) < 0) {
                sprintf(str, GetString(STR_SIGALTSTACK_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }

        // Install SIGILL handler for emulating privileged instructions and
        // executing A-Trap and EMUL_OP opcodes
        sigemptyset(&sigill_sa.sa_mask);        // Block virtual 68k interrupts during SIGILL handling
        sigaddset(&sigill_sa.sa_mask, SIG_IRQ);
        sigaddset(&sigill_sa.sa_mask, SIGALRM);
        sigill_sa.sa_handler = (void (*)(int))sigill_handler;
        sigill_sa.sa_flags = SA_ONSTACK;
        if (sigaction(SIGILL, &sigill_sa, NULL) < 0) {
                sprintf(str, GetString(STR_SIG_INSTALL_ERR), "SIGILL", strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }

        // Install virtual 68k interrupt signal handler
        sigemptyset(&sigirq_sa.sa_mask);
        sigaddset(&sigirq_sa.sa_mask, SIGALRM);
        sigirq_sa.sa_handler = (void (*)(int))sigirq_handler;
        sigirq_sa.sa_flags = SA_ONSTACK | SA_RESTART;
        if (sigaction(SIG_IRQ, &sigirq_sa, NULL) < 0) {
                sprintf(str, GetString(STR_SIG_INSTALL_ERR), "SIG_IRQ", strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
#endif

#ifdef ENABLE_MON
        // Setup SIGINT handler to enter mon
        sigemptyset(&sigint_sa.sa_mask);
        sigint_sa.sa_handler = (void (*)(int))sigint_handler;
        sigint_sa.sa_flags = 0;
        sigaction(SIGINT, &sigint_sa, NULL);
#endif

#if defined(HAVE_TIMER_CREATE) && defined(_POSIX_REALTIME_SIGNALS)

        // POSIX.4 timers and real-time signals available, start 60Hz timer
        sigemptyset(&timer_sa.sa_mask);
        timer_sa.sa_sigaction = (void (*)(int, siginfo_t *, void *))one_tick;
        timer_sa.sa_flags = SA_SIGINFO | SA_RESTART;
        if (sigaction(SIG_TIMER, &timer_sa, NULL) < 0) {
                sprintf(str, GetString(STR_SIG_INSTALL_ERR), "SIG_TIMER", strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
        struct sigevent timer_event;
        timer_event.sigev_notify = SIGEV_SIGNAL;
        timer_event.sigev_signo = SIG_TIMER;
        if (timer_create(CLOCK_REALTIME, &timer_event, &timer) < 0) {
                sprintf(str, GetString(STR_TIMER_CREATE_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
        struct itimerspec req;
        req.it_value.tv_sec = 0;
        req.it_value.tv_nsec = 16625000;
        req.it_interval.tv_sec = 0;
        req.it_interval.tv_nsec = 16625000;
        if (timer_settime(timer, 0, &req, NULL) < 0) {
                sprintf(str, GetString(STR_TIMER_SETTIME_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
        D(bug("60Hz timer started\n"));

#elif defined(HAVE_PTHREADS)

        // POSIX threads available, start 60Hz thread
        pthread_attr_init(&tick_thread_attr);
#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING)
        if (geteuid() == 0) {
                pthread_attr_setinheritsched(&tick_thread_attr, PTHREAD_EXPLICIT_SCHED);
                pthread_attr_setschedpolicy(&tick_thread_attr, SCHED_FIFO);
                struct sched_param fifo_param;
                fifo_param.sched_priority = (sched_get_priority_min(SCHED_FIFO) + sched_get_priority_max(SCHED_FIFO)) / 2;
                pthread_attr_setschedparam(&tick_thread_attr, &fifo_param);
        }
#endif
        tick_thread_active = (pthread_create(&tick_thread, &tick_thread_attr, tick_func, NULL) == 0);
        if (!tick_thread_active) {
                sprintf(str, GetString(STR_TICK_THREAD_ERR), strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
        D(bug("60Hz thread started\n"));

#else

        // Start 60Hz timer
        sigemptyset(&timer_sa.sa_mask);         // Block virtual 68k interrupts during SIGARLM handling
        sigaddset(&timer_sa.sa_mask, SIG_IRQ);
        timer_sa.sa_handler = one_tick;
        timer_sa.sa_flags = SA_ONSTACK | SA_RESTART;
        if (sigaction(SIGALRM, &timer_sa, NULL) < 0) {
                sprintf(str, GetString(STR_SIG_INSTALL_ERR), "SIGALRM", strerror(errno));
                ErrorAlert(str);
                QuitEmulator();
        }
        struct itimerval req;
        req.it_interval.tv_sec = req.it_value.tv_sec = 0;
        req.it_interval.tv_usec = req.it_value.tv_usec = 16625;
        setitimer(ITIMER_REAL, &req, NULL);

#endif

#ifdef HAVE_PTHREADS
        // Start XPRAM watchdog thread
        memcpy(last_xpram, XPRAM, 256);
        xpram_thread_active = (pthread_create(&xpram_thread, NULL, xpram_func, NULL) == 0);
        D(bug("XPRAM thread started\n"));
#endif

        // Start 68k and jump to ROM boot routine
        D(bug("Starting emulation...\n"));
        Start680x0();

        QuitEmulator();
        return 0;
}


/*
 *  Quit emulator
 */

void QuitEmulator(void)
{
        D(bug("QuitEmulator\n"));

#if EMULATED_68K
        // Exit 680x0 emulation
        Exit680x0();
#endif

#if defined(HAVE_TIMER_CREATE) && defined(_POSIX_REALTIME_SIGNALS)
        // Stop 60Hz timer
        timer_delete(timer);
#elif defined(HAVE_PTHREADS)
        // Stop 60Hz thread
        if (tick_thread_active) {
                tick_thread_cancel = true;
#ifdef HAVE_PTHREAD_CANCEL
                pthread_cancel(tick_thread);
#endif
                pthread_join(tick_thread, NULL);
        }
#else
        struct itimerval req;
        req.it_interval.tv_sec = req.it_value.tv_sec = 0;
        req.it_interval.tv_usec = req.it_value.tv_usec = 0;
        setitimer(ITIMER_REAL, &req, NULL);
#endif

#ifdef HAVE_PTHREADS
        // Stop XPRAM watchdog thread
        if (xpram_thread_active) {
                xpram_thread_cancel = true;
#ifdef HAVE_PTHREAD_CANCEL
                pthread_cancel(xpram_thread);
#endif
                pthread_join(xpram_thread, NULL);
        }
#endif

        // Deinitialize everything
        ExitAll();

        // Free ROM/RAM areas
#if REAL_ADDRESSING
        if (memory_mapped_from_zero)
                munmap((caddr_t)0x0000, mapped_ram_rom_size);
        else
#endif
#if REAL_ADDRESSING || DIRECT_ADDRESSING
        if (RAMBaseHost != (uint8 *)MAP_FAILED) {
                munmap((caddr_t)RAMBaseHost, mapped_ram_rom_size);
                RAMBaseHost = NULL;
        }
#else
        if (ROMBaseHost) {
                free(ROMBaseHost);
                ROMBaseHost = NULL;
        }
        if (RAMBaseHost) {
                free(RAMBaseHost);
                RAMBaseHost = NULL;
        }
#endif

#if USE_SCRATCHMEM_SUBTERFUGE
        // Delete scratch memory area
        if (ScratchMem) {
                free((void *)(ScratchMem - SCRATCH_MEM_SIZE/2));
                ScratchMem = NULL;
        }
#endif

#if REAL_ADDRESSING
        // Delete Low Memory area
        if (lm_area_mapped)
                munmap((char *)0x0000, 0x2000);
#endif

        // Close /dev/zero
        if (zero_fd > 0)
                close(zero_fd);

        // Exit system routines
        SysExit();

        // Exit preferences
        PrefsExit();

        // Close X11 server connection
        if (x_display)
                XCloseDisplay(x_display);

        exit(0);
}


/*
 *  Code was patched, flush caches if neccessary (i.e. when using a real 680x0
 *  or a dynamically recompiling emulator)
 */

void FlushCodeCache(void *start, uint32 size)
{
#if !EMULATED_68K && defined(__NetBSD__)
        m68k_sync_icache(start, size);
#endif
}


/*
 *  SIGINT handler, enters mon
 */

#ifdef ENABLE_MON
static void sigint_handler(...)
{
#if EMULATED_68K
        uaecptr nextpc;
        extern void m68k_dumpstate(uaecptr *nextpc);
        m68k_dumpstate(&nextpc);
#else
        char *arg[4] = {"mon", "-m", "-r", NULL};
        mon(3, arg);
        QuitEmulator();
#endif
}
#endif


/*
 *  Interrupt flags (must be handled atomically!)
 */

uint32 InterruptFlags = 0;

#if EMULATED_68K
void SetInterruptFlag(uint32 flag)
{
#ifdef HAVE_PTHREADS
        pthread_mutex_lock(&intflag_lock);
        InterruptFlags |= flag;
        pthread_mutex_unlock(&intflag_lock);
#else
        InterruptFlags |= flag;         // Pray that this is an atomic operation...
#endif
}

void ClearInterruptFlag(uint32 flag)
{
#ifdef HAVE_PTHREADS
        pthread_mutex_lock(&intflag_lock);
        InterruptFlags &= ~flag;
        pthread_mutex_unlock(&intflag_lock);
#else
        InterruptFlags &= ~flag;
#endif
}
#endif

#if !EMULATED_68K
void TriggerInterrupt(void)
{
#if defined(HAVE_PTHREADS)
        pthread_kill(emul_thread, SIG_IRQ);
#else
        raise(SIG_IRQ);
#endif
}

void TriggerNMI(void)
{
        // not yet supported
}
#endif


/*
 *  XPRAM watchdog thread (saves XPRAM every minute)
 */

static void xpram_watchdog(void)
{
        if (memcmp(last_xpram, XPRAM, 256)) {
                memcpy(last_xpram, XPRAM, 256);
                SaveXPRAM();
        }
}

#ifdef HAVE_PTHREADS
static void *xpram_func(void *arg)
{
        while (!xpram_thread_cancel) {
                for (int i=0; i<60 && !xpram_thread_cancel; i++)
                        Delay_usec(1000000);
                xpram_watchdog();
        }
        return NULL;
}
#endif


/*
 *  60Hz thread (really 60.15Hz)
 */

static void one_second(void)
{
        // Pseudo Mac 1Hz interrupt, update local time
        WriteMacInt32(0x20c, TimerDateTime());

        SetInterruptFlag(INTFLAG_1HZ);
        TriggerInterrupt();

#ifndef HAVE_PTHREADS
        static int second_counter = 0;
        if (++second_counter > 60) {
                second_counter = 0;
                xpram_watchdog();
        }
#endif
}

static void one_tick(...)
{
        static int tick_counter = 0;
        if (++tick_counter > 60) {
                tick_counter = 0;
                one_second();
        }

#ifndef HAVE_PTHREADS
        // No threads available, perform video refresh from here
        VideoRefresh();
#endif

        // Trigger 60Hz interrupt
        if (ROMVersion != ROM_VERSION_CLASSIC || HasMacStarted()) {
                SetInterruptFlag(INTFLAG_60HZ);
                TriggerInterrupt();
        }
}

#ifdef HAVE_PTHREADS
static void *tick_func(void *arg)
{
        uint64 next = GetTicks_usec();
        while (!tick_thread_cancel) {
                one_tick();
                next += 16625;
                int64 delay = next - GetTicks_usec();
                if (delay > 0)
                        Delay_usec(delay);
                else if (delay < -16625)
                        next = GetTicks_usec();
        }
        return NULL;
}
#endif


/*
 *  Get current value of microsecond timer
 */

uint64 GetTicks_usec(void)
{
#ifdef HAVE_CLOCK_GETTIME
        struct timespec t;
        clock_gettime(CLOCK_REALTIME, &t);
        return (uint64)t.tv_sec * 1000000 + t.tv_nsec / 1000;
#else
        struct timeval t;
        gettimeofday(&t, NULL);
        return (uint64)t.tv_sec * 1000000 + t.tv_usec;
#endif
}


/*
 *  Delay by specified number of microseconds (<1 second)
 *  (adapted from SDL_Delay() source; this function is designed to provide
 *  the highest accuracy possible)
 */

void Delay_usec(uint32 usec)
{
        int was_error;

#if defined(linux)
        struct timeval tv;
#elif defined(__FreeBSD__) || defined(sgi)
        struct timespec elapsed, tv;
#else   // Non-Linux implementations need to calculate time left
        uint64 then, now, elapsed;
#endif

        // Set the timeout interval - Linux only needs to do this once
#if defined(linux)
        tv.tv_sec = 0;
        tv.tv_usec = usec;
#elif defined(__FreeBSD__)
        elapsed.tv_sec = 0;
        elapsed.tv_nsec = usec * 1000;
#else
        then = GetTicks_usec();
#endif
        do {
                errno = 0;
#if !defined(linux) && !defined(__FreeBSD__) && !defined(sgi)
                /* Calculate the time interval left (in case of interrupt) */
                now = GetTicks_usec();
                elapsed = now - then;
                then = now;
                if (elapsed >= usec)
                        break;
                usec -= elapsed;
                tv.tv_sec = 0;
                tv.tv_usec = usec;
#endif
#if defined(__FreeBSD__) || defined(sgi)
                tv.tv_sec = elapsed.tv_sec;
                tv.tv_nsec = elapsed.tv_nsec;
                was_error = nanosleep(&tv, &elapsed);
#else
                was_error = select(0, NULL, NULL, NULL, &tv);
#endif
        } while (was_error && (errno == EINTR));
}


#if !EMULATED_68K
/*
 *  Virtual 68k interrupt handler
 */

static void sigirq_handler(int sig, int code, struct sigcontext *scp)
{
        // Interrupts disabled? Then do nothing
        if (EmulatedSR & 0x0700)
                return;

        struct sigstate *state = (struct sigstate *)scp->sc_ap;
        M68kRegisters *regs = (M68kRegisters *)&state->ss_frame;

        // Set up interrupt frame on stack
        uint32 a7 = regs->a[7];
        a7 -= 2;
        WriteMacInt16(a7, 0x64);
        a7 -= 4;
        WriteMacInt32(a7, scp->sc_pc);
        a7 -= 2;
        WriteMacInt16(a7, scp->sc_ps | EmulatedSR);
        scp->sc_sp = regs->a[7] = a7;

        // Set interrupt level
        EmulatedSR |= 0x2100;

        // Jump to MacOS interrupt handler on return
        scp->sc_pc = ReadMacInt32(0x64);
}


/*
 *  SIGILL handler, for emulation of privileged instructions and executing
 *  A-Trap and EMUL_OP opcodes
 */

static void sigill_handler(int sig, int code, struct sigcontext *scp)
{
        struct sigstate *state = (struct sigstate *)scp->sc_ap;
        uint16 *pc = (uint16 *)scp->sc_pc;
        uint16 opcode = *pc;
        M68kRegisters *regs = (M68kRegisters *)&state->ss_frame;

#define INC_PC(n) scp->sc_pc += (n)

#define GET_SR (scp->sc_ps | EmulatedSR)

#define STORE_SR(v) \
        scp->sc_ps = (v) & 0xff; \
        EmulatedSR = (v) & 0xe700; \
        if (((v) & 0x0700) == 0 && InterruptFlags) \
                TriggerInterrupt();

//printf("opcode %04x at %p, sr %04x, emul_sr %04x\n", opcode, pc, scp->sc_ps, EmulatedSR);

        if ((opcode & 0xf000) == 0xa000) {

                // A-Line instruction, set up A-Line trap frame on stack
                uint32 a7 = regs->a[7];
                a7 -= 2;
                WriteMacInt16(a7, 0x28);
                a7 -= 4;
                WriteMacInt32(a7, (uint32)pc);
                a7 -= 2;
                WriteMacInt16(a7, GET_SR);
                scp->sc_sp = regs->a[7] = a7;

                // Jump to MacOS A-Line handler on return
                scp->sc_pc = ReadMacInt32(0x28);

        } else if ((opcode & 0xff00) == 0x7100) {

                // Extended opcode, push registers on user stack
                uint32 a7 = regs->a[7];
                a7 -= 4;
                WriteMacInt32(a7, (uint32)pc);
                a7 -= 2;
                WriteMacInt16(a7, scp->sc_ps);
                for (int i=7; i>=0; i--) {
                        a7 -= 4;
                        WriteMacInt32(a7, regs->a[i]);
                }
                for (int i=7; i>=0; i--) {
                        a7 -= 4;
                        WriteMacInt32(a7, regs->d[i]);
                }
                scp->sc_sp = regs->a[7] = a7;

                // Jump to EmulOp trampoline code on return
                scp->sc_pc = (uint32)EmulOpTrampoline;
                
        } else switch (opcode) {        // Emulate privileged instructions

                case 0x40e7:    // move sr,-(sp)
                        regs->a[7] -= 2;
                        WriteMacInt16(regs->a[7], GET_SR);
                        scp->sc_sp = regs->a[7];
                        INC_PC(2);
                        break;

                case 0x46df: {  // move (sp)+,sr
                        uint16 sr = ReadMacInt16(regs->a[7]);
                        STORE_SR(sr);
                        regs->a[7] += 2;
                        scp->sc_sp = regs->a[7];
                        INC_PC(2);
                        break;
                }

                case 0x007c: {  // ori #xxxx,sr
                        uint16 sr = GET_SR | pc[1];
                        scp->sc_ps = sr & 0xff;         // oring bits into the sr can't enable interrupts, so we don't need to call STORE_SR
                        EmulatedSR = sr & 0xe700;
                        INC_PC(4);
                        break;
                }

                case 0x027c: {  // andi #xxxx,sr
                        uint16 sr = GET_SR & pc[1];
                        STORE_SR(sr);
                        INC_PC(4);
                        break;
                }

                case 0x46fc:    // move #xxxx,sr
                        STORE_SR(pc[1]);
                        INC_PC(4);
                        break;

                case 0x46ef: {  // move (xxxx,sp),sr
                        uint16 sr = ReadMacInt16(regs->a[7] + (int32)(int16)pc[1]);
                        STORE_SR(sr);
                        INC_PC(4);
                        break;
                }

                case 0x46d8:    // move (a0)+,sr
                case 0x46d9: {  // move (a1)+,sr
                        uint16 sr = ReadMacInt16(regs->a[opcode & 7]);
                        STORE_SR(sr);
                        regs->a[opcode & 7] += 2;
                        INC_PC(2);
                        break;
                }

                case 0x40f8:    // move sr,xxxx.w
                        WriteMacInt16(pc[1], GET_SR);
                        INC_PC(4);
                        break;

                case 0x40d0:    // move sr,(a0)
                case 0x40d1:    // move sr,(a1)
                case 0x40d2:    // move sr,(a2)
                case 0x40d3:    // move sr,(a3)
                case 0x40d4:    // move sr,(a4)
                case 0x40d5:    // move sr,(a5)
                case 0x40d6:    // move sr,(a6)
                case 0x40d7:    // move sr,(sp)
                        WriteMacInt16(regs->a[opcode & 7], GET_SR);
                        INC_PC(2);
                        break;

                case 0x40c0:    // move sr,d0
                case 0x40c1:    // move sr,d1
                case 0x40c2:    // move sr,d2
                case 0x40c3:    // move sr,d3
                case 0x40c4:    // move sr,d4
                case 0x40c5:    // move sr,d5
                case 0x40c6:    // move sr,d6
                case 0x40c7:    // move sr,d7
                        regs->d[opcode & 7] = GET_SR;
                        INC_PC(2);
                        break;

                case 0x46c0:    // move d0,sr
                case 0x46c1:    // move d1,sr
                case 0x46c2:    // move d2,sr
                case 0x46c3:    // move d3,sr
                case 0x46c4:    // move d4,sr
                case 0x46c5:    // move d5,sr
                case 0x46c6:    // move d6,sr
                case 0x46c7: {  // move d7,sr
                        uint16 sr = regs->d[opcode & 7];
                        STORE_SR(sr);
                        INC_PC(2);
                        break;
                }

                case 0xf327:    // fsave -(sp)
                        if (CPUIs68060) {
                                regs->a[7] -= 4;
                                WriteMacInt32(regs->a[7], 0x60000000);  // Idle frame
                                regs->a[7] -= 4;
                                WriteMacInt32(regs->a[7], 0);
                                regs->a[7] -= 4;
                                WriteMacInt32(regs->a[7], 0);
                        } else {
                                regs->a[7] -= 4;
                                WriteMacInt32(regs->a[7], 0x41000000);  // Idle frame
                        }
                        scp->sc_sp = regs->a[7];
                        INC_PC(2);
                        break;

                case 0xf35f:    // frestore (sp)+
                        if (CPUIs68060)
                                regs->a[7] += 12;
                        else
                                regs->a[7] += 4;
                        scp->sc_sp = regs->a[7];
                        INC_PC(2);
                        break;

                case 0x4e73: {  // rte
                        uint32 a7 = regs->a[7];
                        uint16 sr = ReadMacInt16(a7);
                        a7 += 2;
                        scp->sc_ps = sr & 0xff;
                        EmulatedSR = sr & 0xe700;
                        scp->sc_pc = ReadMacInt32(a7);
                        a7 += 4;
                        uint16 format = ReadMacInt16(a7) >> 12;
                        a7 += 2;
                        static const int frame_adj[16] = {
                                0, 0, 4, 4, 8, 0, 0, 52, 50, 12, 24, 84, 16, 0, 0, 0
                        };
                        scp->sc_sp = regs->a[7] = a7 + frame_adj[format];
                        break;
                }

                case 0x4e7a:    // movec cr,x
                        switch (pc[1]) {
                                case 0x0002:    // movec cacr,d0
                                        regs->d[0] = 0x3111;
                                        break;
                                case 0x1002:    // movec cacr,d1
                                        regs->d[1] = 0x3111;
                                        break;
                                case 0x0003:    // movec tc,d0
                                case 0x0004:    // movec itt0,d0
                                case 0x0005:    // movec itt1,d0
                                case 0x0006:    // movec dtt0,d0
                                case 0x0007:    // movec dtt1,d0
                                case 0x0806:    // movec urp,d0
                                case 0x0807:    // movec srp,d0
                                        regs->d[0] = 0;
                                        break;
                                case 0x1000:    // movec sfc,d1
                                case 0x1001:    // movec dfc,d1
                                case 0x1003:    // movec tc,d1
                                case 0x1801:    // movec vbr,d1
                                        regs->d[1] = 0;
                                        break;
                                case 0x8801:    // movec vbr,a0
                                        regs->a[0] = 0;
                                        break;
                                case 0x9801:    // movec vbr,a1
                                        regs->a[1] = 0;
                                        break;
                                default:
                                        goto ill;
                        }
                        INC_PC(4);
                        break;

                case 0x4e7b:    // movec x,cr
                        switch (pc[1]) {
                                case 0x1000:    // movec d1,sfc
                                case 0x1001:    // movec d1,dfc
                                case 0x0801:    // movec d0,vbr
                                case 0x1801:    // movec d1,vbr
                                        break;
                                case 0x0002:    // movec d0,cacr
                                case 0x1002:    // movec d1,cacr
                                        FlushCodeCache(NULL, 0);
                                        break;
                                default:
                                        goto ill;
                        }
                        INC_PC(4);
                        break;

                case 0xf478:    // cpusha dc
                case 0xf4f8:    // cpusha dc/ic
                        FlushCodeCache(NULL, 0);
                        INC_PC(2);
                        break;

                default:
ill:            printf("SIGILL num %d, code %d\n", sig, code);
                        printf(" context %p:\n", scp);
                        printf("  onstack %08x\n", scp->sc_onstack);
                        printf("  sp %08x\n", scp->sc_sp);
                        printf("  fp %08x\n", scp->sc_fp);
                        printf("  pc %08x\n", scp->sc_pc);
                        printf("   opcode %04x\n", opcode);
                        printf("  sr %08x\n", scp->sc_ps);
                        printf(" state %p:\n", state);
                        printf("  flags %d\n", state->ss_flags);
                        for (int i=0; i<8; i++)
                                printf("  d%d %08x\n", i, state->ss_frame.f_regs[i]);
                        for (int i=0; i<8; i++)
                                printf("  a%d %08x\n", i, state->ss_frame.f_regs[i+8]);

#ifdef ENABLE_MON
                        char *arg[4] = {"mon", "-m", "-r", NULL};
                        mon(3, arg);
#endif
                        QuitEmulator();
                        break;
        }
}
#endif


/*
 *  Display alert
 */

#ifdef ENABLE_GTK
static void dl_destroyed(void)
{
        gtk_main_quit();
}

static void dl_quit(GtkWidget *dialog)
{
        gtk_widget_destroy(dialog);
}

void display_alert(int title_id, int prefix_id, int button_id, const char *text)
{
        char str[256];
        sprintf(str, GetString(prefix_id), text);

        GtkWidget *dialog = gtk_dialog_new();
        gtk_window_set_title(GTK_WINDOW(dialog), GetString(title_id));
        gtk_container_border_width(GTK_CONTAINER(dialog), 5);
        gtk_widget_set_uposition(GTK_WIDGET(dialog), 100, 150);
        gtk_signal_connect(GTK_OBJECT(dialog), "destroy", GTK_SIGNAL_FUNC(dl_destroyed), NULL);

        GtkWidget *label = gtk_label_new(str);
        gtk_widget_show(label);
        gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), label, TRUE, TRUE, 0);

        GtkWidget *button = gtk_button_new_with_label(GetString(button_id));
        gtk_widget_show(button);
        gtk_signal_connect_object(GTK_OBJECT(button), "clicked", GTK_SIGNAL_FUNC(dl_quit), GTK_OBJECT(dialog));
        gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->action_area), button, FALSE, FALSE, 0);
        GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
        gtk_widget_grab_default(button);
        gtk_widget_show(dialog);

        gtk_main();
}
#endif


/*
 *  Display error alert
 */

void ErrorAlert(const char *text)
{
#ifdef ENABLE_GTK
        if (PrefsFindBool("nogui") || x_display == NULL) {
                printf(GetString(STR_SHELL_ERROR_PREFIX), text);
                return;
        }
        VideoQuitFullScreen();
        display_alert(STR_ERROR_ALERT_TITLE, STR_GUI_ERROR_PREFIX, STR_QUIT_BUTTON, text);
#else
        printf(GetString(STR_SHELL_ERROR_PREFIX), text);
#endif
}


/*
 *  Display warning alert
 */

void WarningAlert(const char *text)
{
#ifdef ENABLE_GTK
        if (PrefsFindBool("nogui") || x_display == NULL) {
                printf(GetString(STR_SHELL_WARNING_PREFIX), text);
                return;
        }
        display_alert(STR_WARNING_ALERT_TITLE, STR_GUI_WARNING_PREFIX, STR_OK_BUTTON, text);
#else
        printf(GetString(STR_SHELL_WARNING_PREFIX), text);
#endif
}


/*
 *  Display choice alert
 */

bool ChoiceAlert(const char *text, const char *pos, const char *neg)
{
        printf(GetString(STR_SHELL_WARNING_PREFIX), text);
        return false;   //!!
}
Revision:	1.25
Committed:	2000-11-02T14:45:16Z (24 years ago) by cebix
Branch:	MAIN
Changes since 1.24:	+19 -5 lines
Log Message:	- added audio support for IRIX [Brian J. Johnson] - improved Delay_usec() under FreeBSD and IRIX - fixed typo ("HAVE_PTHREDS") in video_x.cpp