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


// 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 *)AllocMem(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);

        // 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)
                FreeMem(RAMBaseHost, RAMSize + 0x100000);

        // 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);
}


/*
 *  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(*(uint16 *)(r->pc), (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:	1.7
Committed:	2000-07-14T21:29:10Z (24 years, 4 months ago) by cebix
Branch:	MAIN
Changes since 1.6:	+9 -7 lines
Log Message:	- AmigaOS bug fixes by J.Lachmann (floppy, 2060scsi.device, "Add Volume" in prefs editor) - imported some changes from the Windows source (1Hz interrupt, FPU fixes)
#	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
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	cebix	1.3	struct Library *GfxBase = NULL;
89			struct IntuitionBase *IntuitionBase = NULL;
90	cebix	1.1	struct Library *GadToolsBase = NULL;
91	cebix	1.3	struct Library *IFFParseBase = NULL;
92	cebix	1.1	struct Library *AslBase = NULL;
93			struct Library *P96Base = NULL;
94	cebix	1.6	struct Library *CyberGfxBase = NULL;
95	cebix	1.1	struct Library *TimerBase = NULL;
96			struct Library *AHIBase = NULL;
97			struct Library *DiskBase = NULL;
98
99			struct Task *MainTask; // Our task
100			uint32 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 *tick_proc = NULL; // 60Hz process
112			static volatile bool tick_proc_active = true; // Flag for quitting the 60Hz process
113
114			static bool stack_swapped = false; // Stack swapping
115			static StackSwapStruct stack_swap;
116
117
118			// Assembly functions
119			struct trap_regs;
120			extern "C" void AtomicAnd(uint32 *p, uint32 val);
121			extern "C" void AtomicOr(uint32 *p, uint32 val);
122			extern "C" void MoveVBR(void);
123			extern "C" void TrapHandlerAsm(void);
124			extern "C" void ExceptionHandlerAsm(void);
125			extern "C" void IllInstrHandler(trap_regs *regs);
126			extern "C" void PrivViolHandler(trap_regs *regs);
127	cebix	1.3	extern "C" void quit_emulator(void);
128	cebix	1.1	uint16 EmulatedSR; // Emulated SR (supervisor bit and interrupt mask)
129
130
131	cebix	1.3	// Prototypes
132			static void jump_to_rom(void);
133			static void tick_func(void);
134
135
136	cebix	1.1	/*
137			* Main program
138			*/
139
140			int main(void)
141			{
142			// Initialize variables
143			RAMBaseHost = NULL;
144			ROMBaseHost = NULL;
145			MainTask = FindTask(NULL);
146			struct DateStamp ds;
147			DateStamp(&ds);
148			srand(ds.ds_Tick);
149
150			// Print some info
151			printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
152			printf(" %s\n", GetString(STR_ABOUT_TEXT2));
153
154			// Open libraries
155	cebix	1.3	GfxBase = OpenLibrary((UBYTE *)"graphics.library", 39);
156			if (GfxBase == NULL) {
157			printf("Cannot open graphics.library V39.\n");
158			exit(1);
159			}
160			IntuitionBase = (struct IntuitionBase )OpenLibrary((UBYTE )"intuition.library", 39);
161			if (IntuitionBase == NULL) {
162			printf("Cannot open intuition.library V39.\n");
163			CloseLibrary(GfxBase);
164			exit(1);
165			}
166	cebix	1.1	DiskBase = (struct Library )OpenResource((UBYTE )"disk.resource");
167			if (DiskBase == NULL)
168			QuitEmulator();
169			GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
170			if (GadToolsBase == NULL) {
171			ErrorAlert(GetString(STR_NO_GADTOOLS_LIB_ERR));
172			QuitEmulator();
173			}
174	cebix	1.3	IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
175			if (IFFParseBase == NULL) {
176			ErrorAlert(GetString(STR_NO_IFFPARSE_LIB_ERR));
177			QuitEmulator();
178			}
179	cebix	1.1	AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
180			if (AslBase == NULL) {
181			ErrorAlert(GetString(STR_NO_ASL_LIB_ERR));
182			QuitEmulator();
183			}
184	cebix	1.6
185			// These two can fail (the respective gfx support won't be available, then)
186	cebix	1.1	P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
187	cebix	1.6	CyberGfxBase = OpenLibrary((UBYTE *)"cybergraphics.library", 2);
188	cebix	1.1
189	cebix	1.3	// Read preferences
190			PrefsInit();
191
192	cebix	1.1	// Open AHI
193			ahi_port = CreateMsgPort();
194			if (ahi_port) {
195			ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
196			if (ahi_io) {
197			ahi_io->ahir_Version = 2;
198			if (OpenDevice((UBYTE )AHINAME, AHI_NO_UNIT, (struct IORequest )ahi_io, 0) == 0) {
199			AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
200			}
201			}
202			}
203
204			// Init system routines
205			SysInit();
206
207			// Show preferences editor
208			if (!PrefsFindBool("nogui"))
209			if (!PrefsEditor())
210			QuitEmulator();
211
212			// Check start of Chip memory (because we need access to 0x0000..0x2000)
213			if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
214			ErrorAlert(GetString(STR_NO_PREPARE_EMUL_ERR));
215			QuitEmulator();
216			}
217
218			// Open timer.device
219			timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC \| MEMF_CLEAR);
220			if (timereq == NULL) {
221			ErrorAlert(GetString(STR_NO_MEM_ERR));
222			QuitEmulator();
223			}
224			if (OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timereq, 0)) {
225			ErrorAlert(GetString(STR_NO_TIMER_DEV_ERR));
226			QuitEmulator();
227			}
228			TimerBase = (struct Library *)timereq->tr_node.io_Device;
229
230			// Allocate scratch memory
231			ScratchMem = (uint32)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
232			if (ScratchMem == NULL) {
233			ErrorAlert(GetString(STR_NO_MEM_ERR));
234			QuitEmulator();
235			}
236			ScratchMem += SCRATCH_MEM_SIZE/2; // ScratchMem points to middle of block
237
238			// Create area for Mac RAM and ROM (ROM must be higher in memory,
239			// so we allocate one big chunk and put the ROM at the top of it)
240			RAMSize = PrefsFindInt32("ramsize") & 0xfff00000; // Round down to 1MB boundary
241			if (RAMSize < 1024*1024) {
242			WarningAlert(GetString(STR_SMALL_RAM_WARN));
243			RAMSize = 1024*1024;
244			}
245			RAMBaseHost = (uint8 *)AllocMem(RAMSize + 0x100000, MEMF_PUBLIC);
246			if (RAMBaseHost == NULL) {
247			ErrorAlert(GetString(STR_NO_MEM_ERR));
248			QuitEmulator();
249			}
250			RAMBaseMac = (uint32)RAMBaseHost;
251			D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
252			ROMBaseHost = RAMBaseHost + RAMSize;
253			ROMBaseMac = (uint32)ROMBaseHost;
254			D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));
255
256			// Get rom file path from preferences
257			const char *rom_path = PrefsFindString("rom");
258
259			// Load Mac ROM
260	cebix	1.3	BPTR rom_fh = Open(rom_path ? (char )rom_path : (char )ROM_FILE_NAME, MODE_OLDFILE);
261	cebix	1.1	if (rom_fh == NULL) {
262			ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
263			QuitEmulator();
264			}
265			printf(GetString(STR_READING_ROM_FILE));
266			Seek(rom_fh, 0, OFFSET_END);
267			ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
268			if (ROMSize != 5121024 && ROMSize != 10241024) {
269			ErrorAlert(GetString(STR_ROM_SIZE_ERR));
270			Close(rom_fh);
271			QuitEmulator();
272			}
273			Seek(rom_fh, 0, OFFSET_BEGINNING);
274			if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
275			ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
276			Close(rom_fh);
277			QuitEmulator();
278			}
279
280			// Set CPU and FPU type
281			UWORD attn = SysBase->AttnFlags;
282			CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
283			CPUIs68060 = attn & AFF_68060;
284			FPUType = attn & AFF_68881 ? 1 : 0;
285
286	cebix	1.2	// Initialize everything
287			if (!InitAll())
288	cebix	1.1	QuitEmulator();
289
290			// Move VBR away from 0 if neccessary
291			MoveVBR();
292
293			// Install trap handler
294			EmulatedSR = 0x2700;
295			OldTrapHandler = MainTask->tc_TrapCode;
296			MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;
297
298			// Allocate signal for interrupt emulation and install exception handler
299			IRQSig = AllocSignal(-1);
300			IRQSigMask = 1 << IRQSig;
301			OldExceptionHandler = MainTask->tc_ExceptCode;
302			MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
303			SetExcept(SIGBREAKF_CTRL_C \| IRQSigMask, SIGBREAKF_CTRL_C \| IRQSigMask);
304
305			// Start 60Hz process
306			tick_proc = CreateNewProcTags(
307	cebix	1.3	NP_Entry, (ULONG)tick_func,
308			NP_Name, (ULONG)"Basilisk II 60Hz",
309	cebix	1.1	NP_Priority, 5,
310			TAG_END
311			);
312
313			// Set task priority to -1 so we don't use all processing time
314			SetTaskPri(MainTask, -1);
315
316			// Swap stack to Mac RAM area
317			stack_swap.stk_Lower = RAMBaseHost;
318			stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
319			stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
320			StackSwap(&stack_swap);
321			stack_swapped = true;
322
323			// Jump to ROM boot routine
324			Start680x0();
325
326			QuitEmulator();
327			return 0;
328			}
329
330			void Start680x0(void)
331			{
332			typedef void (*rom_func)(void);
333			rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
334			fp();
335			}
336
337
338			/*
339			* Quit emulator (__saveds because it might be called from an exception)
340			*/
341
342	cebix	1.3	// Assembly entry point
343			void __saveds quit_emulator(void)
344			{
345			QuitEmulator();
346			}
347
348			void QuitEmulator(void)
349	cebix	1.1	{
350	cebix	1.7	// Stop 60Hz thread
351			if (tick_proc) {
352			SetSignal(0, SIGF_SINGLE);
353			tick_proc_active = false;
354			Wait(SIGF_SINGLE);
355			}
356
357	cebix	1.1	// Restore stack
358			if (stack_swapped) {
359			stack_swapped = false;
360			StackSwap(&stack_swap);
361			}
362
363			// Remove exception handler
364			if (IRQSig >= 0) {
365			SetExcept(0, SIGBREAKF_CTRL_C \| IRQSigMask);
366			MainTask->tc_ExceptCode = OldExceptionHandler;
367			FreeSignal(IRQSig);
368			}
369
370			// Remove trap handler
371			MainTask->tc_TrapCode = OldTrapHandler;
372
373	cebix	1.2	// Deinitialize everything
374			ExitAll();
375	cebix	1.1
376			// Delete RAM/ROM area
377			if (RAMBaseHost)
378			FreeMem(RAMBaseHost, RAMSize + 0x100000);
379
380			// Delete scratch memory area
381			if (ScratchMem)
382			FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);
383
384			// Close timer.device
385			if (TimerBase)
386			CloseDevice((struct IORequest *)timereq);
387			if (timereq)
388			FreeVec(timereq);
389
390			// Exit system routines
391			SysExit();
392
393			// Close AHI
394			if (AHIBase)
395			CloseDevice((struct IORequest *)ahi_io);
396			if (ahi_io)
397			DeleteIORequest((struct IORequest *)ahi_io);
398			if (ahi_port)
399			DeleteMsgPort(ahi_port);
400
401			// Exit preferences
402			PrefsExit();
403
404			// Close libraries
405	cebix	1.6	if (CyberGfxBase)
406			CloseLibrary(CyberGfxBase);
407	cebix	1.1	if (P96Base)
408			CloseLibrary(P96Base);
409			if (AslBase)
410			CloseLibrary(AslBase);
411	cebix	1.3	if (IFFParseBase)
412			CloseLibrary(IFFParseBase);
413	cebix	1.1	if (GadToolsBase)
414			CloseLibrary(GadToolsBase);
415	cebix	1.3	if (IntuitionBase)
416			CloseLibrary((struct Library *)IntuitionBase);
417			if (GfxBase)
418			CloseLibrary(GfxBase);
419	cebix	1.1
420			exit(0);
421			}
422
423
424			/*
425			* Code was patched, flush caches if neccessary (i.e. when using a real 680x0
426			* or a dynamically recompiling emulator)
427			*/
428
429			void FlushCodeCache(void *start, uint32 size)
430			{
431			CacheClearE(start, size, CACRF_ClearI \| CACRF_ClearD);
432			}
433
434
435			/*
436			* Interrupt flags (must be handled atomically!)
437			*/
438
439			uint32 InterruptFlags;
440
441			void SetInterruptFlag(uint32 flag)
442			{
443			AtomicOr(&InterruptFlags, flag);
444			}
445
446			void ClearInterruptFlag(uint32 flag)
447			{
448			AtomicAnd(&InterruptFlags, ~flag);
449			}
450
451			void TriggerInterrupt(void)
452			{
453			Signal(MainTask, IRQSigMask);
454			}
455
456
457			/*
458			* 60Hz thread
459			*/
460
461			static __saveds void tick_func(void)
462			{
463			int tick_counter = 0;
464			struct MsgPort *timer_port = NULL;
465			struct timerequest *timer_io = NULL;
466			ULONG timer_mask = 0;
467
468			// Start 60Hz timer
469			timer_port = CreateMsgPort();
470			if (timer_port) {
471			timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
472			if (timer_io) {
473			if (!OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timer_io, 0)) {
474			timer_mask = 1 << timer_port->mp_SigBit;
475			timer_io->tr_node.io_Command = TR_ADDREQUEST;
476			timer_io->tr_time.tv_secs = 0;
477			timer_io->tr_time.tv_micro = 16625;
478			SendIO((struct IORequest *)timer_io);
479			}
480			}
481			}
482
483			while (tick_proc_active) {
484
485			// Wait for timer tick
486			Wait(timer_mask);
487
488			// Restart timer
489			timer_io->tr_node.io_Command = TR_ADDREQUEST;
490			timer_io->tr_time.tv_secs = 0;
491			timer_io->tr_time.tv_micro = 16625;
492			SendIO((struct IORequest *)timer_io);
493
494			// Pseudo Mac 1Hz interrupt, update local time
495			if (++tick_counter > 60) {
496			tick_counter = 0;
497			WriteMacInt32(0x20c, TimerDateTime());
498	cebix	1.7	SetInterruptFlag(INTFLAG_1HZ);
499			TriggerInterrupt();
500	cebix	1.1	}
501
502			// Trigger 60Hz interrupt
503			SetInterruptFlag(INTFLAG_60HZ);
504			TriggerInterrupt();
505			}
506
507			// Stop timer
508			if (timer_io) {
509			if (!CheckIO((struct IORequest *)timer_io))
510			AbortIO((struct IORequest *)timer_io);
511			WaitIO((struct IORequest *)timer_io);
512			CloseDevice((struct IORequest *)timer_io);
513			DeleteIORequest(timer_io);
514			}
515			if (timer_port)
516			DeleteMsgPort(timer_port);
517
518			// Main task asked for termination, send signal
519			Forbid();
520			Signal(MainTask, SIGF_SINGLE);
521			}
522
523
524			/*
525			* Display error alert
526			*/
527
528			void ErrorAlert(const char *text)
529			{
530			if (PrefsFindBool("nogui")) {
531			printf(GetString(STR_SHELL_ERROR_PREFIX), text);
532			return;
533			}
534			EasyStruct req;
535			req.es_StructSize = sizeof(EasyStruct);
536			req.es_Flags = 0;
537			req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
538			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
539			req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
540	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
541	cebix	1.1	}
542
543
544			/*
545			* Display warning alert
546			*/
547
548			void WarningAlert(const char *text)
549			{
550			if (PrefsFindBool("nogui")) {
551			printf(GetString(STR_SHELL_WARNING_PREFIX), text);
552			return;
553			}
554			EasyStruct req;
555			req.es_StructSize = sizeof(EasyStruct);
556			req.es_Flags = 0;
557			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
558			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
559			req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
560	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
561	cebix	1.1	}
562
563
564			/*
565			* Display choice alert
566			*/
567
568			bool ChoiceAlert(const char text, const char pos, const char *neg)
569			{
570			char str[256];
571			sprintf(str, "%s\|%s", pos, neg);
572			EasyStruct req;
573			req.es_StructSize = sizeof(EasyStruct);
574			req.es_Flags = 0;
575			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
576			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
577			req.es_GadgetFormat = (UBYTE *)str;
578	cebix	1.3	return EasyRequest(NULL, &req, NULL, (ULONG)text);
579	cebix	1.1	}
580
581
582			/*
583			* Illegal Instruction and Privilege Violation trap handlers
584			*/
585
586			struct trap_regs { // This must match the layout of M68kRegisters
587			uint32 d[8];
588			uint32 a[8];
589			uint16 sr;
590			uint32 pc;
591			};
592
593			void __saveds IllInstrHandler(trap_regs *r)
594			{
595			uint16 opcode = (uint16 )(r->pc);
596			if ((opcode & 0xff00) != 0x7100) {
597			printf("Illegal Instruction %04x at %08lx\n", (uint16 )(r->pc), r->pc);
598			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
599			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
600			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
601			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
602			"sr %04x\n",
603			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
604			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
605			r->sr);
606			QuitEmulator();
607			} else {
608			// Disable interrupts
609			uint16 sr = EmulatedSR;
610			EmulatedSR \|= 0x0700;
611
612			// Call opcode routine
613			EmulOp((uint16 )(r->pc), (M68kRegisters *)r);
614			r->pc += 2;
615
616			// Restore interrupts
617			EmulatedSR = sr;
618			if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
619			Signal(MainTask, IRQSigMask);
620			}
621			}
622
623			void __saveds PrivViolHandler(trap_regs *r)
624			{
625			printf("Privileged instruction %04x %04x at %08lx\n", (uint16 )(r->pc), (uint16 )(r->pc + 2), r->pc);
626			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
627			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
628			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
629			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
630			"sr %04x\n",
631			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
632			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
633			r->sr);
634			QuitEmulator();
635			}