src/AmigaOS/main_amiga.cpp

/*
 *  main_amiga.cpp - Startup code for AmigaOS
 *
 *  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 <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

uint32 MacsBugFlags = 0xbff;


// 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
uint32 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 *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 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);
uint16 EmulatedSR;                                      // Emulated SR (supervisor bit and interrupt mask)


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


/*
 *  Main program
 */

int main(void)
{
        // 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(GetString(STR_NO_GADTOOLS_LIB_ERR));
                QuitEmulator();
        }
        IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
        if (IFFParseBase == NULL) {
                ErrorAlert(GetString(STR_NO_IFFPARSE_LIB_ERR));
                QuitEmulator();
        }
        AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
        if (AslBase == NULL) {
                ErrorAlert(GetString(STR_NO_ASL_LIB_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();

        // 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(GetString(STR_NO_PREPARE_EMUL_ERR));
                QuitEmulator();
        }

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

        // Allocate scratch memory
        ScratchMem = (uint32)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
        if (ScratchMem == NULL) {
                ErrorAlert(GetString(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) {
//              ErrorAlert(GetString(STR_NO_MEM_ERR));
//              QuitEmulator();
//      }
        if (RAMBaseHost == NULL)
                {
                uint32 newRAMSize = AvailMem(MEMF_LARGEST) - 0x100000;
                char xText[120];

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

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

                RAMSize = newRAMSize;
                RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
                if (RAMBaseHost == NULL) {
                        ErrorAlert(GetString(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 == NULL) {
                ErrorAlert(GetString(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(GetString(STR_ROM_SIZE_ERR));
                Close(rom_fh);
                QuitEmulator();
        }
        Seek(rom_fh, 0, OFFSET_BEGINNING);
        if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
                ErrorAlert(GetString(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();

        // 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 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(MacsBugFlags, 0);

        // 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 thread
        if (tick_proc) {
                SetSignal(0, SIGF_SINGLE);
                tick_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);
}


/*
 *  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
 */

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);
}


/*
 *  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:	1.9
Committed:	2000-08-20T14:08:41Z (24 years, 2 months ago) by jlachmann
Branch:	MAIN
Changes since 1.8:	+32 -6 lines
Log Message:	added MacsBug Support -jl-
#	User	Rev	Content
1	cebix	1.1	/*
2			* main_amiga.cpp - Startup code for AmigaOS
3			*
4	cebix	1.5	* Basilisk II (C) 1997-2000 Christian Bauer
5	cebix	1.1	*
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	cebix	1.4	// Options for libnix
60			unsigned long __stack = 0x4000; // Stack requirement
61			int __nocommandline = 1; // Disable command line parsing
62	cebix	1.3
63
64	cebix	1.1	// Constants
65			static const char ROM_FILE_NAME[] = "ROM";
66	cebix	1.3	static const char __ver[] = "$VER: " VERSION_STRING " " __DATE__;
67	cebix	1.1	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	jlachmann	1.9	uint32 MacsBugFlags = 0xbff;
79
80	cebix	1.1
81			// CPU and FPU type, addressing mode
82			int CPUType;
83			bool CPUIs68060;
84			int FPUType;
85			bool TwentyFourBitAddressing;
86
87
88			// Global variables
89			extern ExecBase *SysBase;
90	cebix	1.3	struct Library *GfxBase = NULL;
91			struct IntuitionBase *IntuitionBase = NULL;
92	cebix	1.1	struct Library *GadToolsBase = NULL;
93	cebix	1.3	struct Library *IFFParseBase = NULL;
94	cebix	1.1	struct Library *AslBase = NULL;
95			struct Library *P96Base = NULL;
96	cebix	1.6	struct Library *CyberGfxBase = NULL;
97	cebix	1.1	struct Library *TimerBase = NULL;
98			struct Library *AHIBase = NULL;
99			struct Library *DiskBase = NULL;
100
101			struct Task *MainTask; // Our task
102			uint32 ScratchMem = NULL; // Scratch memory for Mac ROM writes
103			APTR OldTrapHandler = NULL; // Old trap handler
104			APTR OldExceptionHandler = NULL; // Old exception handler
105			BYTE IRQSig = -1; // "Interrupt" signal number
106			ULONG IRQSigMask = 0; // "Interrupt" signal mask
107
108			static struct timerequest *timereq = NULL; // IORequest for timer
109
110			static struct MsgPort *ahi_port = NULL; // Port for AHI
111			static struct AHIRequest *ahi_io = NULL; // IORequest for AHI
112
113			static struct Process *tick_proc = NULL; // 60Hz process
114			static volatile bool tick_proc_active = true; // Flag for quitting the 60Hz process
115
116			static bool stack_swapped = false; // Stack swapping
117			static StackSwapStruct stack_swap;
118
119
120			// Assembly functions
121			struct trap_regs;
122			extern "C" void AtomicAnd(uint32 *p, uint32 val);
123			extern "C" void AtomicOr(uint32 *p, uint32 val);
124			extern "C" void MoveVBR(void);
125			extern "C" void TrapHandlerAsm(void);
126			extern "C" void ExceptionHandlerAsm(void);
127			extern "C" void IllInstrHandler(trap_regs *regs);
128			extern "C" void PrivViolHandler(trap_regs *regs);
129	cebix	1.3	extern "C" void quit_emulator(void);
130	cebix	1.1	uint16 EmulatedSR; // Emulated SR (supervisor bit and interrupt mask)
131
132
133	cebix	1.3	// Prototypes
134			static void jump_to_rom(void);
135			static void tick_func(void);
136
137
138	cebix	1.1	/*
139			* Main program
140			*/
141
142			int main(void)
143			{
144			// Initialize variables
145			RAMBaseHost = NULL;
146			ROMBaseHost = NULL;
147			MainTask = FindTask(NULL);
148			struct DateStamp ds;
149			DateStamp(&ds);
150			srand(ds.ds_Tick);
151
152			// Print some info
153			printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
154			printf(" %s\n", GetString(STR_ABOUT_TEXT2));
155
156			// Open libraries
157	cebix	1.3	GfxBase = OpenLibrary((UBYTE *)"graphics.library", 39);
158			if (GfxBase == NULL) {
159			printf("Cannot open graphics.library V39.\n");
160			exit(1);
161			}
162			IntuitionBase = (struct IntuitionBase )OpenLibrary((UBYTE )"intuition.library", 39);
163			if (IntuitionBase == NULL) {
164			printf("Cannot open intuition.library V39.\n");
165			CloseLibrary(GfxBase);
166			exit(1);
167			}
168	cebix	1.1	DiskBase = (struct Library )OpenResource((UBYTE )"disk.resource");
169			if (DiskBase == NULL)
170			QuitEmulator();
171			GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
172			if (GadToolsBase == NULL) {
173			ErrorAlert(GetString(STR_NO_GADTOOLS_LIB_ERR));
174			QuitEmulator();
175			}
176	cebix	1.3	IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
177			if (IFFParseBase == NULL) {
178			ErrorAlert(GetString(STR_NO_IFFPARSE_LIB_ERR));
179			QuitEmulator();
180			}
181	cebix	1.1	AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
182			if (AslBase == NULL) {
183			ErrorAlert(GetString(STR_NO_ASL_LIB_ERR));
184			QuitEmulator();
185			}
186	cebix	1.6
187			// These two can fail (the respective gfx support won't be available, then)
188	cebix	1.1	P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
189	cebix	1.6	CyberGfxBase = OpenLibrary((UBYTE *)"cybergraphics.library", 2);
190	cebix	1.1
191	cebix	1.3	// Read preferences
192			PrefsInit();
193
194	cebix	1.1	// Open AHI
195			ahi_port = CreateMsgPort();
196			if (ahi_port) {
197			ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
198			if (ahi_io) {
199			ahi_io->ahir_Version = 2;
200			if (OpenDevice((UBYTE )AHINAME, AHI_NO_UNIT, (struct IORequest )ahi_io, 0) == 0) {
201			AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
202			}
203			}
204			}
205
206			// Init system routines
207			SysInit();
208
209			// Show preferences editor
210			if (!PrefsFindBool("nogui"))
211			if (!PrefsEditor())
212			QuitEmulator();
213
214			// Check start of Chip memory (because we need access to 0x0000..0x2000)
215			if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
216			ErrorAlert(GetString(STR_NO_PREPARE_EMUL_ERR));
217			QuitEmulator();
218			}
219
220			// Open timer.device
221			timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC \| MEMF_CLEAR);
222			if (timereq == NULL) {
223			ErrorAlert(GetString(STR_NO_MEM_ERR));
224			QuitEmulator();
225			}
226			if (OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timereq, 0)) {
227			ErrorAlert(GetString(STR_NO_TIMER_DEV_ERR));
228			QuitEmulator();
229			}
230			TimerBase = (struct Library *)timereq->tr_node.io_Device;
231
232			// Allocate scratch memory
233			ScratchMem = (uint32)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
234			if (ScratchMem == NULL) {
235			ErrorAlert(GetString(STR_NO_MEM_ERR));
236			QuitEmulator();
237			}
238			ScratchMem += SCRATCH_MEM_SIZE/2; // ScratchMem points to middle of block
239
240			// Create area for Mac RAM and ROM (ROM must be higher in memory,
241			// so we allocate one big chunk and put the ROM at the top of it)
242			RAMSize = PrefsFindInt32("ramsize") & 0xfff00000; // Round down to 1MB boundary
243			if (RAMSize < 1024*1024) {
244			WarningAlert(GetString(STR_SMALL_RAM_WARN));
245			RAMSize = 1024*1024;
246			}
247	jlachmann	1.9	RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
248			// if (RAMBaseHost == NULL) {
249			// ErrorAlert(GetString(STR_NO_MEM_ERR));
250			// QuitEmulator();
251			// }
252			if (RAMBaseHost == NULL)
253			{
254			uint32 newRAMSize = AvailMem(MEMF_LARGEST) - 0x100000;
255			char xText[120];
256
257			sprintf(xText, GetString(STR_NOT_ENOUGH_MEM_WARN), RAMSize, newRAMSize);
258
259			if (1 != ChoiceAlert(xText, "Use", "Quit"))
260			QuitEmulator();
261
262			RAMSize = newRAMSize;
263			RAMBaseHost = (uint8 *)AllocVec(RAMSize + 0x100000, MEMF_PUBLIC);
264			if (RAMBaseHost == NULL) {
265			ErrorAlert(GetString(STR_NO_MEM_ERR));
266			QuitEmulator();
267			}
268			}
269	cebix	1.1	RAMBaseMac = (uint32)RAMBaseHost;
270			D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
271			ROMBaseHost = RAMBaseHost + RAMSize;
272			ROMBaseMac = (uint32)ROMBaseHost;
273			D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));
274
275			// Get rom file path from preferences
276			const char *rom_path = PrefsFindString("rom");
277
278			// Load Mac ROM
279	cebix	1.3	BPTR rom_fh = Open(rom_path ? (char )rom_path : (char )ROM_FILE_NAME, MODE_OLDFILE);
280	cebix	1.1	if (rom_fh == NULL) {
281			ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
282			QuitEmulator();
283			}
284			printf(GetString(STR_READING_ROM_FILE));
285			Seek(rom_fh, 0, OFFSET_END);
286			ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
287			if (ROMSize != 5121024 && ROMSize != 10241024) {
288			ErrorAlert(GetString(STR_ROM_SIZE_ERR));
289			Close(rom_fh);
290			QuitEmulator();
291			}
292			Seek(rom_fh, 0, OFFSET_BEGINNING);
293			if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
294			ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
295			Close(rom_fh);
296			QuitEmulator();
297			}
298
299			// Set CPU and FPU type
300			UWORD attn = SysBase->AttnFlags;
301			CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
302			CPUIs68060 = attn & AFF_68060;
303			FPUType = attn & AFF_68881 ? 1 : 0;
304
305	cebix	1.2	// Initialize everything
306			if (!InitAll())
307	cebix	1.1	QuitEmulator();
308
309			// Move VBR away from 0 if neccessary
310			MoveVBR();
311
312			// Install trap handler
313			EmulatedSR = 0x2700;
314			OldTrapHandler = MainTask->tc_TrapCode;
315			MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;
316
317			// Allocate signal for interrupt emulation and install exception handler
318			IRQSig = AllocSignal(-1);
319			IRQSigMask = 1 << IRQSig;
320			OldExceptionHandler = MainTask->tc_ExceptCode;
321			MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
322			SetExcept(SIGBREAKF_CTRL_C \| IRQSigMask, SIGBREAKF_CTRL_C \| IRQSigMask);
323
324			// Start 60Hz process
325			tick_proc = CreateNewProcTags(
326	cebix	1.3	NP_Entry, (ULONG)tick_func,
327			NP_Name, (ULONG)"Basilisk II 60Hz",
328	cebix	1.1	NP_Priority, 5,
329			TAG_END
330			);
331
332			// Set task priority to -1 so we don't use all processing time
333			SetTaskPri(MainTask, -1);
334
335	jlachmann	1.9	WriteMacInt32(MacsBugFlags, 0);
336
337	cebix	1.1	// Swap stack to Mac RAM area
338			stack_swap.stk_Lower = RAMBaseHost;
339			stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
340			stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
341			StackSwap(&stack_swap);
342			stack_swapped = true;
343
344			// Jump to ROM boot routine
345			Start680x0();
346
347			QuitEmulator();
348			return 0;
349			}
350
351			void Start680x0(void)
352			{
353			typedef void (*rom_func)(void);
354			rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
355			fp();
356			}
357
358
359			/*
360			* Quit emulator (__saveds because it might be called from an exception)
361			*/
362
363	cebix	1.3	// Assembly entry point
364			void __saveds quit_emulator(void)
365			{
366			QuitEmulator();
367			}
368
369			void QuitEmulator(void)
370	cebix	1.1	{
371	cebix	1.7	// Stop 60Hz thread
372			if (tick_proc) {
373			SetSignal(0, SIGF_SINGLE);
374			tick_proc_active = false;
375			Wait(SIGF_SINGLE);
376			}
377
378	cebix	1.1	// Restore stack
379			if (stack_swapped) {
380			stack_swapped = false;
381			StackSwap(&stack_swap);
382			}
383
384			// Remove exception handler
385			if (IRQSig >= 0) {
386			SetExcept(0, SIGBREAKF_CTRL_C \| IRQSigMask);
387			MainTask->tc_ExceptCode = OldExceptionHandler;
388			FreeSignal(IRQSig);
389			}
390
391			// Remove trap handler
392			MainTask->tc_TrapCode = OldTrapHandler;
393
394	cebix	1.2	// Deinitialize everything
395			ExitAll();
396	cebix	1.1
397			// Delete RAM/ROM area
398			if (RAMBaseHost)
399	jlachmann	1.9	FreeVec(RAMBaseHost);
400	cebix	1.1
401			// Delete scratch memory area
402			if (ScratchMem)
403			FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);
404
405			// Close timer.device
406			if (TimerBase)
407			CloseDevice((struct IORequest *)timereq);
408			if (timereq)
409			FreeVec(timereq);
410
411			// Exit system routines
412			SysExit();
413
414			// Close AHI
415			if (AHIBase)
416			CloseDevice((struct IORequest *)ahi_io);
417			if (ahi_io)
418			DeleteIORequest((struct IORequest *)ahi_io);
419			if (ahi_port)
420			DeleteMsgPort(ahi_port);
421
422			// Exit preferences
423			PrefsExit();
424
425			// Close libraries
426	cebix	1.6	if (CyberGfxBase)
427			CloseLibrary(CyberGfxBase);
428	cebix	1.1	if (P96Base)
429			CloseLibrary(P96Base);
430			if (AslBase)
431			CloseLibrary(AslBase);
432	cebix	1.3	if (IFFParseBase)
433			CloseLibrary(IFFParseBase);
434	cebix	1.1	if (GadToolsBase)
435			CloseLibrary(GadToolsBase);
436	cebix	1.3	if (IntuitionBase)
437			CloseLibrary((struct Library *)IntuitionBase);
438			if (GfxBase)
439			CloseLibrary(GfxBase);
440	cebix	1.1
441			exit(0);
442			}
443
444
445			/*
446			* Code was patched, flush caches if neccessary (i.e. when using a real 680x0
447			* or a dynamically recompiling emulator)
448			*/
449
450			void FlushCodeCache(void *start, uint32 size)
451			{
452			CacheClearE(start, size, CACRF_ClearI \| CACRF_ClearD);
453			}
454
455
456			/*
457			* Interrupt flags (must be handled atomically!)
458			*/
459
460			uint32 InterruptFlags;
461
462			void SetInterruptFlag(uint32 flag)
463			{
464			AtomicOr(&InterruptFlags, flag);
465			}
466
467			void ClearInterruptFlag(uint32 flag)
468			{
469			AtomicAnd(&InterruptFlags, ~flag);
470			}
471
472			void TriggerInterrupt(void)
473			{
474			Signal(MainTask, IRQSigMask);
475	jlachmann	1.9	}
476
477			void TriggerNMI(void)
478			{
479			AsmTriggerNMI();
480	cebix	1.1	}
481
482
483			/*
484			* 60Hz thread
485			*/
486
487			static __saveds void tick_func(void)
488			{
489			int tick_counter = 0;
490			struct MsgPort *timer_port = NULL;
491			struct timerequest *timer_io = NULL;
492			ULONG timer_mask = 0;
493
494			// Start 60Hz timer
495			timer_port = CreateMsgPort();
496			if (timer_port) {
497			timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
498			if (timer_io) {
499			if (!OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timer_io, 0)) {
500			timer_mask = 1 << timer_port->mp_SigBit;
501			timer_io->tr_node.io_Command = TR_ADDREQUEST;
502			timer_io->tr_time.tv_secs = 0;
503			timer_io->tr_time.tv_micro = 16625;
504			SendIO((struct IORequest *)timer_io);
505			}
506			}
507			}
508
509			while (tick_proc_active) {
510
511			// Wait for timer tick
512			Wait(timer_mask);
513
514			// Restart timer
515			timer_io->tr_node.io_Command = TR_ADDREQUEST;
516			timer_io->tr_time.tv_secs = 0;
517			timer_io->tr_time.tv_micro = 16625;
518			SendIO((struct IORequest *)timer_io);
519
520			// Pseudo Mac 1Hz interrupt, update local time
521			if (++tick_counter > 60) {
522			tick_counter = 0;
523			WriteMacInt32(0x20c, TimerDateTime());
524	cebix	1.7	SetInterruptFlag(INTFLAG_1HZ);
525			TriggerInterrupt();
526	cebix	1.1	}
527
528			// Trigger 60Hz interrupt
529			SetInterruptFlag(INTFLAG_60HZ);
530			TriggerInterrupt();
531			}
532
533			// Stop timer
534			if (timer_io) {
535			if (!CheckIO((struct IORequest *)timer_io))
536			AbortIO((struct IORequest *)timer_io);
537			WaitIO((struct IORequest *)timer_io);
538			CloseDevice((struct IORequest *)timer_io);
539			DeleteIORequest(timer_io);
540			}
541			if (timer_port)
542			DeleteMsgPort(timer_port);
543
544			// Main task asked for termination, send signal
545			Forbid();
546			Signal(MainTask, SIGF_SINGLE);
547			}
548
549
550			/*
551			* Display error alert
552			*/
553
554			void ErrorAlert(const char *text)
555			{
556			if (PrefsFindBool("nogui")) {
557			printf(GetString(STR_SHELL_ERROR_PREFIX), text);
558			return;
559			}
560			EasyStruct req;
561			req.es_StructSize = sizeof(EasyStruct);
562			req.es_Flags = 0;
563			req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
564			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
565			req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
566	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
567	cebix	1.1	}
568
569
570			/*
571			* Display warning alert
572			*/
573
574			void WarningAlert(const char *text)
575			{
576			if (PrefsFindBool("nogui")) {
577			printf(GetString(STR_SHELL_WARNING_PREFIX), text);
578			return;
579			}
580			EasyStruct req;
581			req.es_StructSize = sizeof(EasyStruct);
582			req.es_Flags = 0;
583			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
584			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
585			req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
586	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
587	cebix	1.1	}
588
589
590			/*
591			* Display choice alert
592			*/
593
594			bool ChoiceAlert(const char text, const char pos, const char *neg)
595			{
596			char str[256];
597			sprintf(str, "%s\|%s", pos, neg);
598			EasyStruct req;
599			req.es_StructSize = sizeof(EasyStruct);
600			req.es_Flags = 0;
601			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
602			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
603			req.es_GadgetFormat = (UBYTE *)str;
604	cebix	1.3	return EasyRequest(NULL, &req, NULL, (ULONG)text);
605	cebix	1.1	}
606
607
608			/*
609			* Illegal Instruction and Privilege Violation trap handlers
610			*/
611
612			struct trap_regs { // This must match the layout of M68kRegisters
613			uint32 d[8];
614			uint32 a[8];
615			uint16 sr;
616			uint32 pc;
617			};
618
619			void __saveds IllInstrHandler(trap_regs *r)
620			{
621			uint16 opcode = (uint16 )(r->pc);
622			if ((opcode & 0xff00) != 0x7100) {
623			printf("Illegal Instruction %04x at %08lx\n", (uint16 )(r->pc), r->pc);
624			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
625			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
626			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
627			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
628			"sr %04x\n",
629			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
630			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
631			r->sr);
632			QuitEmulator();
633			} else {
634			// Disable interrupts
635			uint16 sr = EmulatedSR;
636			EmulatedSR \|= 0x0700;
637
638			// Call opcode routine
639	cebix	1.8	EmulOp(opcode, (M68kRegisters *)r);
640	cebix	1.1	r->pc += 2;
641
642			// Restore interrupts
643			EmulatedSR = sr;
644			if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
645			Signal(MainTask, IRQSigMask);
646			}
647			}
648
649			void __saveds PrivViolHandler(trap_regs *r)
650			{
651			printf("Privileged instruction %04x %04x at %08lx\n", (uint16 )(r->pc), (uint16 )(r->pc + 2), r->pc);
652			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
653			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
654			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
655			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
656			"sr %04x\n",
657			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
658			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
659			r->sr);
660			QuitEmulator();
661			}