src/AmigaOS/main_amiga.cpp

/*
 *  main_amiga.cpp - Startup code for AmigaOS
 *
 *  Basilisk II (C) 1997-2002 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 <exec/types.h>
#include <exec/execbase.h>
#include <exec/memory.h>
#include <exec/tasks.h>
#include <dos/dostags.h>
#include <intuition/intuition.h>
#include <devices/timer.h>
#include <devices/ahi.h>
#include <proto/exec.h>
#include <proto/dos.h>
#include <proto/intuition.h>

#include "sysdeps.h"
#include "cpu_emulation.h"
#include "main.h"
#include "xpram.h"
#include "timer.h"
#include "sony.h"
#include "disk.h"
#include "cdrom.h"
#include "scsi.h"
#include "audio.h"
#include "video.h"
#include "serial.h"
#include "ether.h"
#include "clip.h"
#include "emul_op.h"
#include "rom_patches.h"
#include "prefs.h"
#include "prefs_editor.h"
#include "sys.h"
#include "user_strings.h"
#include "version.h"

#define DEBUG 0
#include "debug.h"


// Options for libnix
unsigned long __stack = 0x4000;         // Stack requirement
int __nocommandline = 1;                        // Disable command line parsing


// Constants
static const char ROM_FILE_NAME[] = "ROM";
static const char __ver[] = "$VER: " VERSION_STRING " " __DATE__;
static const int SCRATCH_MEM_SIZE = 65536;


// 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


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


// Global variables
extern ExecBase *SysBase;
struct Library *GfxBase = NULL;
struct IntuitionBase *IntuitionBase = NULL;
struct Library *GadToolsBase = NULL;
struct Library *IFFParseBase = NULL;
struct Library *AslBase = NULL;
struct Library *P96Base = NULL;
struct Library *CyberGfxBase = NULL;
struct Library *TimerBase = NULL;
struct Library *AHIBase = NULL;
struct Library *DiskBase = NULL;

struct Task *MainTask;                                                  // Our task
uint8 *ScratchMem = NULL;                                               // Scratch memory for Mac ROM writes
APTR OldTrapHandler = NULL;                                             // Old trap handler
APTR OldExceptionHandler = NULL;                                // Old exception handler
BYTE IRQSig = -1;                                                               // "Interrupt" signal number
ULONG IRQSigMask = 0;                                                   // "Interrupt" signal mask

static struct timerequest *timereq = NULL;              // IORequest for timer

static struct MsgPort *ahi_port = NULL;                 // Port for AHI
static struct AHIRequest *ahi_io = NULL;                // IORequest for AHI

static struct Process *xpram_proc = NULL;               // XPRAM watchdog
static volatile bool xpram_proc_active = true;  // Flag for quitting the XPRAM watchdog

static struct Process *tick_proc = NULL;                // 60Hz process
static volatile bool tick_proc_active = true;   // Flag for quitting the 60Hz process

static bool stack_swapped = false;                              // Stack swapping
static StackSwapStruct stack_swap;


// Assembly functions
struct trap_regs;
extern "C" void AtomicAnd(uint32 *p, uint32 val);
extern "C" void AtomicOr(uint32 *p, uint32 val);
extern "C" void MoveVBR(void);
extern "C" void DisableSuperBypass(void);
extern "C" void TrapHandlerAsm(void);
extern "C" void ExceptionHandlerAsm(void);
extern "C" void IllInstrHandler(trap_regs *regs);
extern "C" void PrivViolHandler(trap_regs *regs);
extern "C" void quit_emulator(void);
extern "C" void AsmTriggerNMI(void);
uint16 EmulatedSR;                                      // Emulated SR (supervisor bit and interrupt mask)


// Prototypes
static void jump_to_rom(void);
static void xpram_func(void);
static void tick_func(void);


/*
 *  Main program
 */

int main(int argc, char **argv)
{
        // Initialize variables
        RAMBaseHost = NULL;
        ROMBaseHost = NULL;
        MainTask = FindTask(NULL);
        struct DateStamp ds;
        DateStamp(&ds);
        srand(ds.ds_Tick);

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

        // Open libraries
        GfxBase = OpenLibrary((UBYTE *)"graphics.library", 39);
        if (GfxBase == NULL) {
                printf("Cannot open graphics.library V39.\n");
                exit(1);
        }
        IntuitionBase = (struct IntuitionBase *)OpenLibrary((UBYTE *)"intuition.library", 39);
        if (IntuitionBase == NULL) {
                printf("Cannot open intuition.library V39.\n");
                CloseLibrary(GfxBase);
                exit(1);
        }
        DiskBase = (struct Library *)OpenResource((UBYTE *)"disk.resource");
        if (DiskBase == NULL)
                QuitEmulator();
        GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
        if (GadToolsBase == NULL) {
                ErrorAlert(STR_NO_GADTOOLS_LIB_ERR);
                QuitEmulator();
        }
        IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
        if (IFFParseBase == NULL) {
                ErrorAlert(STR_NO_IFFPARSE_LIB_ERR);
                QuitEmulator();
        }
        AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
        if (AslBase == NULL) {
                ErrorAlert(STR_NO_ASL_LIB_ERR);
                QuitEmulator();
        }

        if (FindTask((UBYTE *) "� Enforcer �"))
                {
                ErrorAlert(STR_ENFORCER_RUNNING_ERR);
                QuitEmulator();
                }

        // These two can fail (the respective gfx support won't be available, then)
        P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
        CyberGfxBase = OpenLibrary((UBYTE *)"cybergraphics.library", 2);

        // Read preferences
        PrefsInit(argc, argv);

        // Open AHI
        ahi_port = CreateMsgPort();
        if (ahi_port) {
                ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
                if (ahi_io) {
                        ahi_io->ahir_Version = 2;
                        if (OpenDevice((UBYTE *)AHINAME, AHI_NO_UNIT, (struct IORequest *)ahi_io, 0) == 0) {
                                AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
                        }
                }
        }

        // Init system routines
        SysInit();

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

        // Check start of Chip memory (because we need access to 0x0000..0x2000)
        if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
                ErrorAlert(STR_NO_PREPARE_EMUL_ERR);
                QuitEmulator();
        }

        // Open timer.device
        timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC | MEMF_CLEAR);
        if (timereq == NULL) {
                ErrorAlert(STR_NO_MEM_ERR);
                QuitEmulator();
        }
        if (OpenDevice((UBYTE *)TIMERNAME, UNIT_MICROHZ, (struct IORequest *)timereq, 0)) {
                ErrorAlert(STR_NO_TIMER_DEV_ERR);
                QuitEmulator();
        }
        TimerBase = (struct Library *)timereq->tr_node.io_Device;

        // Allocate scratch memory
        ScratchMem = (uint8 *)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
        if (ScratchMem == NULL) {
                ErrorAlert(STR_NO_MEM_ERR);
                QuitEmulator();
        }
        ScratchMem += SCRATCH_MEM_SIZE/2;       // ScratchMem points to middle of block

        // Create area for Mac RAM and ROM (ROM must be higher in memory,
        // so we allocate one big chunk and put the ROM at the top of it)
        RAMSize = PrefsFindInt32("ramsize") & 0xfff00000;       // Round down to 1MB boundary
        if (RAMSize < 1024*1024) {
                WarningAlert(GetString(STR_SMALL_RAM_WARN));
                RAMSize = 1024*1024;
        }
        RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
        if (RAMBaseHost == NULL) {
                uint32 newRAMSize = AvailMem(MEMF_LARGEST) - 0x100000;
                char xText[120];

                sprintf(xText, GetString(STR_NOT_ENOUGH_MEM_WARN), RAMSize, newRAMSize);

                if (ChoiceAlert(xText, "Use", "Quit") != 1)
                        QuitEmulator();

                RAMSize = newRAMSize;
                RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
                if (RAMBaseHost == NULL) {
                        ErrorAlert(STR_NO_MEM_ERR);
                        QuitEmulator();
                }
        }
        RAMBaseMac = (uint32)RAMBaseHost;
        D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
        ROMBaseHost = RAMBaseHost + RAMSize;
        ROMBaseMac = (uint32)ROMBaseHost;
        D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));

        // Get rom file path from preferences
        const char *rom_path = PrefsFindString("rom");

        // Load Mac ROM
        BPTR rom_fh = Open(rom_path ? (char *)rom_path : (char *)ROM_FILE_NAME, MODE_OLDFILE);
        if (rom_fh == 0) {
                ErrorAlert(STR_NO_ROM_FILE_ERR);
                QuitEmulator();
        }
        printf(GetString(STR_READING_ROM_FILE));
        Seek(rom_fh, 0, OFFSET_END);
        ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
        if (ROMSize != 512*1024 && ROMSize != 1024*1024) {
                ErrorAlert(STR_ROM_SIZE_ERR);
                Close(rom_fh);
                QuitEmulator();
        }
        Seek(rom_fh, 0, OFFSET_BEGINNING);
        if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
                ErrorAlert(STR_ROM_FILE_READ_ERR);
                Close(rom_fh);
                QuitEmulator();
        }

        // Set CPU and FPU type
        UWORD attn = SysBase->AttnFlags;
        CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
        CPUIs68060 = attn & AFF_68060;
        FPUType = attn & AFF_68881 ? 1 : 0;

        // Initialize everything
        if (!InitAll())
                QuitEmulator();

        // Move VBR away from 0 if neccessary
        MoveVBR();

        // On 68060, disable Super Bypass mode because of a CPU bug that is triggered by MacOS 8
        if (CPUIs68060)
                DisableSuperBypass();

        // Install trap handler
        EmulatedSR = 0x2700;
        OldTrapHandler = MainTask->tc_TrapCode;
        MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;

        // Allocate signal for interrupt emulation and install exception handler
        IRQSig = AllocSignal(-1);
        IRQSigMask = 1 << IRQSig;
        OldExceptionHandler = MainTask->tc_ExceptCode;
        MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
        SetExcept(SIGBREAKF_CTRL_C | IRQSigMask, SIGBREAKF_CTRL_C | IRQSigMask);

        // Start XPRAM watchdog process
        xpram_proc = CreateNewProcTags(
                NP_Entry, (ULONG)xpram_func,
                NP_Name, (ULONG)"Basilisk II XPRAM Watchdog",
                NP_Priority, 0,
                TAG_END
        );

        // Start 60Hz process
        tick_proc = CreateNewProcTags(
                NP_Entry, (ULONG)tick_func,
                NP_Name, (ULONG)"Basilisk II 60Hz",
                NP_Priority, 5,
                TAG_END
        );

        // Set task priority to -1 so we don't use all processing time
        SetTaskPri(MainTask, -1);

        WriteMacInt32(0xbff, 0);        // MacsBugFlags

        // Swap stack to Mac RAM area
        stack_swap.stk_Lower = RAMBaseHost;
        stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
        stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
        StackSwap(&stack_swap);
        stack_swapped = true;

        // Jump to ROM boot routine
        Start680x0();

        QuitEmulator();
        return 0;
}

void Start680x0(void)
{
        typedef void (*rom_func)(void);
        rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
        fp();
}


/*
 *  Quit emulator (__saveds because it might be called from an exception)
 */

// Assembly entry point
void __saveds quit_emulator(void)
{
        QuitEmulator();
}

void QuitEmulator(void)
{
        // Stop 60Hz process
        if (tick_proc) {
                SetSignal(0, SIGF_SINGLE);
                tick_proc_active = false;
                Wait(SIGF_SINGLE);
        }

        // Stop XPRAM watchdog process
        if (xpram_proc) {
                SetSignal(0, SIGF_SINGLE);
                xpram_proc_active = false;
                Wait(SIGF_SINGLE);
        }

        // Restore stack
        if (stack_swapped) {
                stack_swapped = false;
                StackSwap(&stack_swap);
        }

        // Remove exception handler
        if (IRQSig >= 0) {
                SetExcept(0, SIGBREAKF_CTRL_C | IRQSigMask);
                MainTask->tc_ExceptCode = OldExceptionHandler;
                FreeSignal(IRQSig);
        }

        // Remove trap handler
        MainTask->tc_TrapCode = OldTrapHandler;

        // Deinitialize everything
        ExitAll();

        // Delete RAM/ROM area
        if (RAMBaseHost)
                FreeVec(RAMBaseHost);

        // Delete scratch memory area
        if (ScratchMem)
                FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);

        // Close timer.device
        if (TimerBase)
                CloseDevice((struct IORequest *)timereq);
        if (timereq)
                FreeVec(timereq);

        // Exit system routines
        SysExit();

        // Close AHI
        if (AHIBase)
                CloseDevice((struct IORequest *)ahi_io);
        if (ahi_io)
                DeleteIORequest((struct IORequest *)ahi_io);
        if (ahi_port)
                DeleteMsgPort(ahi_port);

        // Exit preferences
        PrefsExit();

        // Close libraries
        if (CyberGfxBase)
                CloseLibrary(CyberGfxBase);
        if (P96Base)
                CloseLibrary(P96Base);
        if (AslBase)
                CloseLibrary(AslBase);
        if (IFFParseBase)
                CloseLibrary(IFFParseBase);
        if (GadToolsBase)
                CloseLibrary(GadToolsBase);
        if (IntuitionBase)
                CloseLibrary((struct Library *)IntuitionBase);
        if (GfxBase)
                CloseLibrary(GfxBase);

        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)
{
        CacheClearE(start, size, CACRF_ClearI | CACRF_ClearD);
}


/*
 *  Mutexes
 */

struct B2_mutex {
        int dummy;      //!!
};

B2_mutex *B2_create_mutex(void)
{
        return new B2_mutex;
}

void B2_lock_mutex(B2_mutex *mutex)
{
}

void B2_unlock_mutex(B2_mutex *mutex)
{
}

void B2_delete_mutex(B2_mutex *mutex)
{
        delete mutex;
}


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

uint32 InterruptFlags;

void SetInterruptFlag(uint32 flag)
{
        AtomicOr(&InterruptFlags, flag);
}

void ClearInterruptFlag(uint32 flag)
{
        AtomicAnd(&InterruptFlags, ~flag);
}

void TriggerInterrupt(void)
{
        Signal(MainTask, IRQSigMask);
}

void TriggerNMI(void)
{
        AsmTriggerNMI();
}


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

static __saveds void tick_func(void)
{
        int tick_counter = 0;
        struct MsgPort *timer_port = NULL;
        struct timerequest *timer_io = NULL;
        ULONG timer_mask = 0;

        // Start 60Hz timer
        timer_port = CreateMsgPort();
        if (timer_port) {
                timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
                if (timer_io) {
                        if (!OpenDevice((UBYTE *)TIMERNAME, UNIT_MICROHZ, (struct IORequest *)timer_io, 0)) {
                                timer_mask = 1 << timer_port->mp_SigBit;
                                timer_io->tr_node.io_Command = TR_ADDREQUEST;
                                timer_io->tr_time.tv_secs = 0;
                                timer_io->tr_time.tv_micro = 16625;
                                SendIO((struct IORequest *)timer_io);
                        }
                }
        }

        while (tick_proc_active) {

                // Wait for timer tick
                Wait(timer_mask);

                // Restart timer
                timer_io->tr_node.io_Command = TR_ADDREQUEST;
                timer_io->tr_time.tv_secs = 0;
                timer_io->tr_time.tv_micro = 16625;
                SendIO((struct IORequest *)timer_io);

                // Pseudo Mac 1Hz interrupt, update local time
                if (++tick_counter > 60) {
                        tick_counter = 0;
                        WriteMacInt32(0x20c, TimerDateTime());
                        SetInterruptFlag(INTFLAG_1HZ);
                        TriggerInterrupt();
                }

                // Trigger 60Hz interrupt
                SetInterruptFlag(INTFLAG_60HZ);
                TriggerInterrupt();
        }

        // Stop timer
        if (timer_io) {
                if (!CheckIO((struct IORequest *)timer_io))
                        AbortIO((struct IORequest *)timer_io);
                WaitIO((struct IORequest *)timer_io);
                CloseDevice((struct IORequest *)timer_io);
                DeleteIORequest(timer_io);
        }
        if (timer_port)
                DeleteMsgPort(timer_port);

        // Main task asked for termination, send signal
        Forbid();
        Signal(MainTask, SIGF_SINGLE);
}


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

static __saveds void xpram_func(void)
{
        uint8 last_xpram[XPRAM_SIZE];
        memcpy(last_xpram, XPRAM, XPRAM_SIZE);

        while (xpram_proc_active) {
                for (int i=0; i<60 && xpram_proc_active; i++)
                        Delay(50);              // Only wait 1 second so we quit promptly when xpram_proc_active becomes false
                if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
                        memcpy(last_xpram, XPRAM, XPRAM_SIZE);
                        SaveXPRAM();
                }
        }

        // Main task asked for termination, send signal
        Forbid();
        Signal(MainTask, SIGF_SINGLE);
}


/*
 *  Display error alert
 */

void ErrorAlert(const char *text)
{
        if (PrefsFindBool("nogui")) {
                printf(GetString(STR_SHELL_ERROR_PREFIX), text);
                return;
        }
        EasyStruct req;
        req.es_StructSize = sizeof(EasyStruct);
        req.es_Flags = 0;
        req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
        req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
        req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
        EasyRequest(NULL, &req, NULL, (ULONG)text);
}


/*
 *  Display warning alert
 */

void WarningAlert(const char *text)
{
        if (PrefsFindBool("nogui")) {
                printf(GetString(STR_SHELL_WARNING_PREFIX), text);
                return;
        }
        EasyStruct req;
        req.es_StructSize = sizeof(EasyStruct);
        req.es_Flags = 0;
        req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
        req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
        req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
        EasyRequest(NULL, &req, NULL, (ULONG)text);
}


/*
 *  Display choice alert
 */

bool ChoiceAlert(const char *text, const char *pos, const char *neg)
{
        char str[256];
        sprintf(str, "%s|%s", pos, neg);
        EasyStruct req;
        req.es_StructSize = sizeof(EasyStruct);
        req.es_Flags = 0;
        req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
        req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
        req.es_GadgetFormat = (UBYTE *)str;
        return EasyRequest(NULL, &req, NULL, (ULONG)text);
}


/*
 *  Illegal Instruction and Privilege Violation trap handlers
 */

struct trap_regs {      // This must match the layout of M68kRegisters
        uint32 d[8];
        uint32 a[8];
        uint16 sr;
        uint32 pc;
};

void __saveds IllInstrHandler(trap_regs *r)
{
        uint16 opcode = *(uint16 *)(r->pc);
        if ((opcode & 0xff00) != 0x7100) {
                printf("Illegal Instruction %04x at %08lx\n", *(uint16 *)(r->pc), r->pc);
                printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
                           "d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
                           "a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
                           "a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
                           "sr %04x\n",
                           r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
                           r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
                           r->sr);
                QuitEmulator();
        } else {
                // Disable interrupts
                uint16 sr = EmulatedSR;
                EmulatedSR |= 0x0700;

                // Call opcode routine
                EmulOp(opcode, (M68kRegisters *)r);
                r->pc += 2;

                // Restore interrupts
                EmulatedSR = sr;
                if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
                        Signal(MainTask, IRQSigMask);
        }
}

void __saveds PrivViolHandler(trap_regs *r)
{
        printf("Privileged instruction %04x %04x at %08lx\n", *(uint16 *)(r->pc), *(uint16 *)(r->pc + 2), r->pc);
        printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
                   "d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
                   "a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
                   "a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
                   "sr %04x\n",
                   r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
                   r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
                   r->sr);
        QuitEmulator();
}
Revision:	1.21
Committed:	2002-01-15T14:58:34Z (22 years, 10 months ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-15012002
Changes since 1.20:	+1 -1 lines
Log Message:	- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0
#	Content
1	/*
2	* main_amiga.cpp - Startup code for AmigaOS
3	*
4	* Basilisk II (C) 1997-2002 Christian Bauer
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19	*/
20
21	#include <exec/types.h>
22	#include <exec/execbase.h>
23	#include <exec/memory.h>
24	#include <exec/tasks.h>
25	#include <dos/dostags.h>
26	#include <intuition/intuition.h>
27	#include <devices/timer.h>
28	#include <devices/ahi.h>
29	#include <proto/exec.h>
30	#include <proto/dos.h>
31	#include <proto/intuition.h>
32
33	#include "sysdeps.h"
34	#include "cpu_emulation.h"
35	#include "main.h"
36	#include "xpram.h"
37	#include "timer.h"
38	#include "sony.h"
39	#include "disk.h"
40	#include "cdrom.h"
41	#include "scsi.h"
42	#include "audio.h"
43	#include "video.h"
44	#include "serial.h"
45	#include "ether.h"
46	#include "clip.h"
47	#include "emul_op.h"
48	#include "rom_patches.h"
49	#include "prefs.h"
50	#include "prefs_editor.h"
51	#include "sys.h"
52	#include "user_strings.h"
53	#include "version.h"
54
55	#define DEBUG 0
56	#include "debug.h"
57
58
59	// Options for libnix
60	unsigned long __stack = 0x4000; // Stack requirement
61	int __nocommandline = 1; // Disable command line parsing
62
63
64	// Constants
65	static const char ROM_FILE_NAME[] = "ROM";
66	static const char __ver[] = "$VER: " VERSION_STRING " " __DATE__;
67	static const int SCRATCH_MEM_SIZE = 65536;
68
69
70	// RAM and ROM pointers
71	uint32 RAMBaseMac; // RAM base (Mac address space)
72	uint8 *RAMBaseHost; // RAM base (host address space)
73	uint32 RAMSize; // Size of RAM
74	uint32 ROMBaseMac; // ROM base (Mac address space)
75	uint8 *ROMBaseHost; // ROM base (host address space)
76	uint32 ROMSize; // Size of ROM
77
78
79	// CPU and FPU type, addressing mode
80	int CPUType;
81	bool CPUIs68060;
82	int FPUType;
83	bool TwentyFourBitAddressing;
84
85
86	// Global variables
87	extern ExecBase *SysBase;
88	struct Library *GfxBase = NULL;
89	struct IntuitionBase *IntuitionBase = NULL;
90	struct Library *GadToolsBase = NULL;
91	struct Library *IFFParseBase = NULL;
92	struct Library *AslBase = NULL;
93	struct Library *P96Base = NULL;
94	struct Library *CyberGfxBase = NULL;
95	struct Library *TimerBase = NULL;
96	struct Library *AHIBase = NULL;
97	struct Library *DiskBase = NULL;
98
99	struct Task *MainTask; // Our task
100	uint8 *ScratchMem = NULL; // Scratch memory for Mac ROM writes
101	APTR OldTrapHandler = NULL; // Old trap handler
102	APTR OldExceptionHandler = NULL; // Old exception handler
103	BYTE IRQSig = -1; // "Interrupt" signal number
104	ULONG IRQSigMask = 0; // "Interrupt" signal mask
105
106	static struct timerequest *timereq = NULL; // IORequest for timer
107
108	static struct MsgPort *ahi_port = NULL; // Port for AHI
109	static struct AHIRequest *ahi_io = NULL; // IORequest for AHI
110
111	static struct Process *xpram_proc = NULL; // XPRAM watchdog
112	static volatile bool xpram_proc_active = true; // Flag for quitting the XPRAM watchdog
113
114	static struct Process *tick_proc = NULL; // 60Hz process
115	static volatile bool tick_proc_active = true; // Flag for quitting the 60Hz process
116
117	static bool stack_swapped = false; // Stack swapping
118	static StackSwapStruct stack_swap;
119
120
121	// Assembly functions
122	struct trap_regs;
123	extern "C" void AtomicAnd(uint32 *p, uint32 val);
124	extern "C" void AtomicOr(uint32 *p, uint32 val);
125	extern "C" void MoveVBR(void);
126	extern "C" void DisableSuperBypass(void);
127	extern "C" void TrapHandlerAsm(void);
128	extern "C" void ExceptionHandlerAsm(void);
129	extern "C" void IllInstrHandler(trap_regs *regs);
130	extern "C" void PrivViolHandler(trap_regs *regs);
131	extern "C" void quit_emulator(void);
132	extern "C" void AsmTriggerNMI(void);
133	uint16 EmulatedSR; // Emulated SR (supervisor bit and interrupt mask)
134
135
136	// Prototypes
137	static void jump_to_rom(void);
138	static void xpram_func(void);
139	static void tick_func(void);
140
141
142	/*
143	* Main program
144	*/
145
146	int main(int argc, char **argv)
147	{
148	// Initialize variables
149	RAMBaseHost = NULL;
150	ROMBaseHost = NULL;
151	MainTask = FindTask(NULL);
152	struct DateStamp ds;
153	DateStamp(&ds);
154	srand(ds.ds_Tick);
155
156	// Print some info
157	printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
158	printf(" %s\n", GetString(STR_ABOUT_TEXT2));
159
160	// Open libraries
161	GfxBase = OpenLibrary((UBYTE *)"graphics.library", 39);
162	if (GfxBase == NULL) {
163	printf("Cannot open graphics.library V39.\n");
164	exit(1);
165	}
166	IntuitionBase = (struct IntuitionBase )OpenLibrary((UBYTE )"intuition.library", 39);
167	if (IntuitionBase == NULL) {
168	printf("Cannot open intuition.library V39.\n");
169	CloseLibrary(GfxBase);
170	exit(1);
171	}
172	DiskBase = (struct Library )OpenResource((UBYTE )"disk.resource");
173	if (DiskBase == NULL)
174	QuitEmulator();
175	GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
176	if (GadToolsBase == NULL) {
177	ErrorAlert(STR_NO_GADTOOLS_LIB_ERR);
178	QuitEmulator();
179	}
180	IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
181	if (IFFParseBase == NULL) {
182	ErrorAlert(STR_NO_IFFPARSE_LIB_ERR);
183	QuitEmulator();
184	}
185	AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
186	if (AslBase == NULL) {
187	ErrorAlert(STR_NO_ASL_LIB_ERR);
188	QuitEmulator();
189	}
190
191	if (FindTask((UBYTE *) "� Enforcer �"))
192	{
193	ErrorAlert(STR_ENFORCER_RUNNING_ERR);
194	QuitEmulator();
195	}
196
197	// These two can fail (the respective gfx support won't be available, then)
198	P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
199	CyberGfxBase = OpenLibrary((UBYTE *)"cybergraphics.library", 2);
200
201	// Read preferences
202	PrefsInit(argc, argv);
203
204	// Open AHI
205	ahi_port = CreateMsgPort();
206	if (ahi_port) {
207	ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
208	if (ahi_io) {
209	ahi_io->ahir_Version = 2;
210	if (OpenDevice((UBYTE )AHINAME, AHI_NO_UNIT, (struct IORequest )ahi_io, 0) == 0) {
211	AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
212	}
213	}
214	}
215
216	// Init system routines
217	SysInit();
218
219	// Show preferences editor
220	if (!PrefsFindBool("nogui"))
221	if (!PrefsEditor())
222	QuitEmulator();
223
224	// Check start of Chip memory (because we need access to 0x0000..0x2000)
225	if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
226	ErrorAlert(STR_NO_PREPARE_EMUL_ERR);
227	QuitEmulator();
228	}
229
230	// Open timer.device
231	timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC \| MEMF_CLEAR);
232	if (timereq == NULL) {
233	ErrorAlert(STR_NO_MEM_ERR);
234	QuitEmulator();
235	}
236	if (OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timereq, 0)) {
237	ErrorAlert(STR_NO_TIMER_DEV_ERR);
238	QuitEmulator();
239	}
240	TimerBase = (struct Library *)timereq->tr_node.io_Device;
241
242	// Allocate scratch memory
243	ScratchMem = (uint8 *)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
244	if (ScratchMem == NULL) {
245	ErrorAlert(STR_NO_MEM_ERR);
246	QuitEmulator();
247	}
248	ScratchMem += SCRATCH_MEM_SIZE/2; // ScratchMem points to middle of block
249
250	// Create area for Mac RAM and ROM (ROM must be higher in memory,
251	// so we allocate one big chunk and put the ROM at the top of it)
252	RAMSize = PrefsFindInt32("ramsize") & 0xfff00000; // Round down to 1MB boundary
253	if (RAMSize < 1024*1024) {
254	WarningAlert(GetString(STR_SMALL_RAM_WARN));
255	RAMSize = 1024*1024;
256	}
257	RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
258	if (RAMBaseHost == NULL) {
259	uint32 newRAMSize = AvailMem(MEMF_LARGEST) - 0x100000;
260	char xText[120];
261
262	sprintf(xText, GetString(STR_NOT_ENOUGH_MEM_WARN), RAMSize, newRAMSize);
263
264	if (ChoiceAlert(xText, "Use", "Quit") != 1)
265	QuitEmulator();
266
267	RAMSize = newRAMSize;
268	RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
269	if (RAMBaseHost == NULL) {
270	ErrorAlert(STR_NO_MEM_ERR);
271	QuitEmulator();
272	}
273	}
274	RAMBaseMac = (uint32)RAMBaseHost;
275	D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
276	ROMBaseHost = RAMBaseHost + RAMSize;
277	ROMBaseMac = (uint32)ROMBaseHost;
278	D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));
279
280	// Get rom file path from preferences
281	const char *rom_path = PrefsFindString("rom");
282
283	// Load Mac ROM
284	BPTR rom_fh = Open(rom_path ? (char )rom_path : (char )ROM_FILE_NAME, MODE_OLDFILE);
285	if (rom_fh == 0) {
286	ErrorAlert(STR_NO_ROM_FILE_ERR);
287	QuitEmulator();
288	}
289	printf(GetString(STR_READING_ROM_FILE));
290	Seek(rom_fh, 0, OFFSET_END);
291	ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
292	if (ROMSize != 5121024 && ROMSize != 10241024) {
293	ErrorAlert(STR_ROM_SIZE_ERR);
294	Close(rom_fh);
295	QuitEmulator();
296	}
297	Seek(rom_fh, 0, OFFSET_BEGINNING);
298	if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
299	ErrorAlert(STR_ROM_FILE_READ_ERR);
300	Close(rom_fh);
301	QuitEmulator();
302	}
303
304	// Set CPU and FPU type
305	UWORD attn = SysBase->AttnFlags;
306	CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
307	CPUIs68060 = attn & AFF_68060;
308	FPUType = attn & AFF_68881 ? 1 : 0;
309
310	// Initialize everything
311	if (!InitAll())
312	QuitEmulator();
313
314	// Move VBR away from 0 if neccessary
315	MoveVBR();
316
317	// On 68060, disable Super Bypass mode because of a CPU bug that is triggered by MacOS 8
318	if (CPUIs68060)
319	DisableSuperBypass();
320
321	// Install trap handler
322	EmulatedSR = 0x2700;
323	OldTrapHandler = MainTask->tc_TrapCode;
324	MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;
325
326	// Allocate signal for interrupt emulation and install exception handler
327	IRQSig = AllocSignal(-1);
328	IRQSigMask = 1 << IRQSig;
329	OldExceptionHandler = MainTask->tc_ExceptCode;
330	MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
331	SetExcept(SIGBREAKF_CTRL_C \| IRQSigMask, SIGBREAKF_CTRL_C \| IRQSigMask);
332
333	// Start XPRAM watchdog process
334	xpram_proc = CreateNewProcTags(
335	NP_Entry, (ULONG)xpram_func,
336	NP_Name, (ULONG)"Basilisk II XPRAM Watchdog",
337	NP_Priority, 0,
338	TAG_END
339	);
340
341	// Start 60Hz process
342	tick_proc = CreateNewProcTags(
343	NP_Entry, (ULONG)tick_func,
344	NP_Name, (ULONG)"Basilisk II 60Hz",
345	NP_Priority, 5,
346	TAG_END
347	);
348
349	// Set task priority to -1 so we don't use all processing time
350	SetTaskPri(MainTask, -1);
351
352	WriteMacInt32(0xbff, 0); // MacsBugFlags
353
354	// Swap stack to Mac RAM area
355	stack_swap.stk_Lower = RAMBaseHost;
356	stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
357	stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
358	StackSwap(&stack_swap);
359	stack_swapped = true;
360
361	// Jump to ROM boot routine
362	Start680x0();
363
364	QuitEmulator();
365	return 0;
366	}
367
368	void Start680x0(void)
369	{
370	typedef void (*rom_func)(void);
371	rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
372	fp();
373	}
374
375
376	/*
377	* Quit emulator (__saveds because it might be called from an exception)
378	*/
379
380	// Assembly entry point
381	void __saveds quit_emulator(void)
382	{
383	QuitEmulator();
384	}
385
386	void QuitEmulator(void)
387	{
388	// Stop 60Hz process
389	if (tick_proc) {
390	SetSignal(0, SIGF_SINGLE);
391	tick_proc_active = false;
392	Wait(SIGF_SINGLE);
393	}
394
395	// Stop XPRAM watchdog process
396	if (xpram_proc) {
397	SetSignal(0, SIGF_SINGLE);
398	xpram_proc_active = false;
399	Wait(SIGF_SINGLE);
400	}
401
402	// Restore stack
403	if (stack_swapped) {
404	stack_swapped = false;
405	StackSwap(&stack_swap);
406	}
407
408	// Remove exception handler
409	if (IRQSig >= 0) {
410	SetExcept(0, SIGBREAKF_CTRL_C \| IRQSigMask);
411	MainTask->tc_ExceptCode = OldExceptionHandler;
412	FreeSignal(IRQSig);
413	}
414
415	// Remove trap handler
416	MainTask->tc_TrapCode = OldTrapHandler;
417
418	// Deinitialize everything
419	ExitAll();
420
421	// Delete RAM/ROM area
422	if (RAMBaseHost)
423	FreeVec(RAMBaseHost);
424
425	// Delete scratch memory area
426	if (ScratchMem)
427	FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);
428
429	// Close timer.device
430	if (TimerBase)
431	CloseDevice((struct IORequest *)timereq);
432	if (timereq)
433	FreeVec(timereq);
434
435	// Exit system routines
436	SysExit();
437
438	// Close AHI
439	if (AHIBase)
440	CloseDevice((struct IORequest *)ahi_io);
441	if (ahi_io)
442	DeleteIORequest((struct IORequest *)ahi_io);
443	if (ahi_port)
444	DeleteMsgPort(ahi_port);
445
446	// Exit preferences
447	PrefsExit();
448
449	// Close libraries
450	if (CyberGfxBase)
451	CloseLibrary(CyberGfxBase);
452	if (P96Base)
453	CloseLibrary(P96Base);
454	if (AslBase)
455	CloseLibrary(AslBase);
456	if (IFFParseBase)
457	CloseLibrary(IFFParseBase);
458	if (GadToolsBase)
459	CloseLibrary(GadToolsBase);
460	if (IntuitionBase)
461	CloseLibrary((struct Library *)IntuitionBase);
462	if (GfxBase)
463	CloseLibrary(GfxBase);
464
465	exit(0);
466	}
467
468
469	/*
470	* Code was patched, flush caches if neccessary (i.e. when using a real 680x0
471	* or a dynamically recompiling emulator)
472	*/
473
474	void FlushCodeCache(void *start, uint32 size)
475	{
476	CacheClearE(start, size, CACRF_ClearI \| CACRF_ClearD);
477	}
478
479
480	/*
481	* Mutexes
482	*/
483
484	struct B2_mutex {
485	int dummy; //!!
486	};
487
488	B2_mutex *B2_create_mutex(void)
489	{
490	return new B2_mutex;
491	}
492
493	void B2_lock_mutex(B2_mutex *mutex)
494	{
495	}
496
497	void B2_unlock_mutex(B2_mutex *mutex)
498	{
499	}
500
501	void B2_delete_mutex(B2_mutex *mutex)
502	{
503	delete mutex;
504	}
505
506
507	/*
508	* Interrupt flags (must be handled atomically!)
509	*/
510
511	uint32 InterruptFlags;
512
513	void SetInterruptFlag(uint32 flag)
514	{
515	AtomicOr(&InterruptFlags, flag);
516	}
517
518	void ClearInterruptFlag(uint32 flag)
519	{
520	AtomicAnd(&InterruptFlags, ~flag);
521	}
522
523	void TriggerInterrupt(void)
524	{
525	Signal(MainTask, IRQSigMask);
526	}
527
528	void TriggerNMI(void)
529	{
530	AsmTriggerNMI();
531	}
532
533
534	/*
535	* 60Hz thread (really 60.15Hz)
536	*/
537
538	static __saveds void tick_func(void)
539	{
540	int tick_counter = 0;
541	struct MsgPort *timer_port = NULL;
542	struct timerequest *timer_io = NULL;
543	ULONG timer_mask = 0;
544
545	// Start 60Hz timer
546	timer_port = CreateMsgPort();
547	if (timer_port) {
548	timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
549	if (timer_io) {
550	if (!OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timer_io, 0)) {
551	timer_mask = 1 << timer_port->mp_SigBit;
552	timer_io->tr_node.io_Command = TR_ADDREQUEST;
553	timer_io->tr_time.tv_secs = 0;
554	timer_io->tr_time.tv_micro = 16625;
555	SendIO((struct IORequest *)timer_io);
556	}
557	}
558	}
559
560	while (tick_proc_active) {
561
562	// Wait for timer tick
563	Wait(timer_mask);
564
565	// Restart timer
566	timer_io->tr_node.io_Command = TR_ADDREQUEST;
567	timer_io->tr_time.tv_secs = 0;
568	timer_io->tr_time.tv_micro = 16625;
569	SendIO((struct IORequest *)timer_io);
570
571	// Pseudo Mac 1Hz interrupt, update local time
572	if (++tick_counter > 60) {
573	tick_counter = 0;
574	WriteMacInt32(0x20c, TimerDateTime());
575	SetInterruptFlag(INTFLAG_1HZ);
576	TriggerInterrupt();
577	}
578
579	// Trigger 60Hz interrupt
580	SetInterruptFlag(INTFLAG_60HZ);
581	TriggerInterrupt();
582	}
583
584	// Stop timer
585	if (timer_io) {
586	if (!CheckIO((struct IORequest *)timer_io))
587	AbortIO((struct IORequest *)timer_io);
588	WaitIO((struct IORequest *)timer_io);
589	CloseDevice((struct IORequest *)timer_io);
590	DeleteIORequest(timer_io);
591	}
592	if (timer_port)
593	DeleteMsgPort(timer_port);
594
595	// Main task asked for termination, send signal
596	Forbid();
597	Signal(MainTask, SIGF_SINGLE);
598	}
599
600
601	/*
602	* XPRAM watchdog thread (saves XPRAM every minute)
603	*/
604
605	static __saveds void xpram_func(void)
606	{
607	uint8 last_xpram[XPRAM_SIZE];
608	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
609
610	while (xpram_proc_active) {
611	for (int i=0; i<60 && xpram_proc_active; i++)
612	Delay(50); // Only wait 1 second so we quit promptly when xpram_proc_active becomes false
613	if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
614	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
615	SaveXPRAM();
616	}
617	}
618
619	// Main task asked for termination, send signal
620	Forbid();
621	Signal(MainTask, SIGF_SINGLE);
622	}
623
624
625	/*
626	* Display error alert
627	*/
628
629	void ErrorAlert(const char *text)
630	{
631	if (PrefsFindBool("nogui")) {
632	printf(GetString(STR_SHELL_ERROR_PREFIX), text);
633	return;
634	}
635	EasyStruct req;
636	req.es_StructSize = sizeof(EasyStruct);
637	req.es_Flags = 0;
638	req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
639	req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
640	req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
641	EasyRequest(NULL, &req, NULL, (ULONG)text);
642	}
643
644
645	/*
646	* Display warning alert
647	*/
648
649	void WarningAlert(const char *text)
650	{
651	if (PrefsFindBool("nogui")) {
652	printf(GetString(STR_SHELL_WARNING_PREFIX), text);
653	return;
654	}
655	EasyStruct req;
656	req.es_StructSize = sizeof(EasyStruct);
657	req.es_Flags = 0;
658	req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
659	req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
660	req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
661	EasyRequest(NULL, &req, NULL, (ULONG)text);
662	}
663
664
665	/*
666	* Display choice alert
667	*/
668
669	bool ChoiceAlert(const char text, const char pos, const char *neg)
670	{
671	char str[256];
672	sprintf(str, "%s\|%s", pos, neg);
673	EasyStruct req;
674	req.es_StructSize = sizeof(EasyStruct);
675	req.es_Flags = 0;
676	req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
677	req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
678	req.es_GadgetFormat = (UBYTE *)str;
679	return EasyRequest(NULL, &req, NULL, (ULONG)text);
680	}
681
682
683	/*
684	* Illegal Instruction and Privilege Violation trap handlers
685	*/
686
687	struct trap_regs { // This must match the layout of M68kRegisters
688	uint32 d[8];
689	uint32 a[8];
690	uint16 sr;
691	uint32 pc;
692	};
693
694	void __saveds IllInstrHandler(trap_regs *r)
695	{
696	uint16 opcode = (uint16 )(r->pc);
697	if ((opcode & 0xff00) != 0x7100) {
698	printf("Illegal Instruction %04x at %08lx\n", (uint16 )(r->pc), r->pc);
699	printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
700	"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
701	"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
702	"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
703	"sr %04x\n",
704	r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
705	r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
706	r->sr);
707	QuitEmulator();
708	} else {
709	// Disable interrupts
710	uint16 sr = EmulatedSR;
711	EmulatedSR \|= 0x0700;
712
713	// Call opcode routine
714	EmulOp(opcode, (M68kRegisters *)r);
715	r->pc += 2;
716
717	// Restore interrupts
718	EmulatedSR = sr;
719	if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
720	Signal(MainTask, IRQSigMask);
721	}
722	}
723
724	void __saveds PrivViolHandler(trap_regs *r)
725	{
726	printf("Privileged instruction %04x %04x at %08lx\n", (uint16 )(r->pc), (uint16 )(r->pc + 2), r->pc);
727	printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
728	"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
729	"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
730	"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
731	"sr %04x\n",
732	r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
733	r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
734	r->sr);
735	QuitEmulator();
736	}