src/AmigaOS/main_amiga.cpp

/*
 *  main_amiga.cpp - Startup code for AmigaOS
 *
 *  Basilisk II (C) 1997-1999 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 *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();
        }
        P96Base = OpenLibrary((UBYTE *)"Picasso96API.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)
{
        // 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);
        }

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

        // 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 (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());
                }

                // 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:	1.4
Committed:	1999-10-21T22:39:56Z (24 years, 8 months ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-22121999, release-0_8-1, snapshot-02111999
Changes since 1.3:	+3 -2 lines
Log Message:	- ExtFS works under AmigaOS - fixed erroneous __regargs attributes in prefs_editor_amiga.cpp and audio_amiga.cpp for GCC
#	User	Rev	Content
1	cebix	1.1	/*
2			* main_amiga.cpp - Startup code for AmigaOS
3			*
4			* Basilisk II (C) 1997-1999 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	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			struct Library *TimerBase = NULL;
95			struct Library *AHIBase = NULL;
96			struct Library *DiskBase = NULL;
97
98			struct Task *MainTask; // Our task
99			uint32 ScratchMem = NULL; // Scratch memory for Mac ROM writes
100			APTR OldTrapHandler = NULL; // Old trap handler
101			APTR OldExceptionHandler = NULL; // Old exception handler
102			BYTE IRQSig = -1; // "Interrupt" signal number
103			ULONG IRQSigMask = 0; // "Interrupt" signal mask
104
105			static struct timerequest *timereq = NULL; // IORequest for timer
106
107			static struct MsgPort *ahi_port = NULL; // Port for AHI
108			static struct AHIRequest *ahi_io = NULL; // IORequest for AHI
109
110			static struct Process *tick_proc = NULL; // 60Hz process
111			static volatile bool tick_proc_active = true; // Flag for quitting the 60Hz process
112
113			static bool stack_swapped = false; // Stack swapping
114			static StackSwapStruct stack_swap;
115
116
117			// Assembly functions
118			struct trap_regs;
119			extern "C" void AtomicAnd(uint32 *p, uint32 val);
120			extern "C" void AtomicOr(uint32 *p, uint32 val);
121			extern "C" void MoveVBR(void);
122			extern "C" void TrapHandlerAsm(void);
123			extern "C" void ExceptionHandlerAsm(void);
124			extern "C" void IllInstrHandler(trap_regs *regs);
125			extern "C" void PrivViolHandler(trap_regs *regs);
126	cebix	1.3	extern "C" void quit_emulator(void);
127	cebix	1.1	uint16 EmulatedSR; // Emulated SR (supervisor bit and interrupt mask)
128
129
130	cebix	1.3	// Prototypes
131			static void jump_to_rom(void);
132			static void tick_func(void);
133
134
135	cebix	1.1	/*
136			* Main program
137			*/
138
139			int main(void)
140			{
141			// Initialize variables
142			RAMBaseHost = NULL;
143			ROMBaseHost = NULL;
144			MainTask = FindTask(NULL);
145			struct DateStamp ds;
146			DateStamp(&ds);
147			srand(ds.ds_Tick);
148
149			// Print some info
150			printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
151			printf(" %s\n", GetString(STR_ABOUT_TEXT2));
152
153			// Open libraries
154	cebix	1.3	GfxBase = OpenLibrary((UBYTE *)"graphics.library", 39);
155			if (GfxBase == NULL) {
156			printf("Cannot open graphics.library V39.\n");
157			exit(1);
158			}
159			IntuitionBase = (struct IntuitionBase )OpenLibrary((UBYTE )"intuition.library", 39);
160			if (IntuitionBase == NULL) {
161			printf("Cannot open intuition.library V39.\n");
162			CloseLibrary(GfxBase);
163			exit(1);
164			}
165	cebix	1.1	DiskBase = (struct Library )OpenResource((UBYTE )"disk.resource");
166			if (DiskBase == NULL)
167			QuitEmulator();
168			GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
169			if (GadToolsBase == NULL) {
170			ErrorAlert(GetString(STR_NO_GADTOOLS_LIB_ERR));
171			QuitEmulator();
172			}
173	cebix	1.3	IFFParseBase = OpenLibrary((UBYTE *)"iffparse.library", 39);
174			if (IFFParseBase == NULL) {
175			ErrorAlert(GetString(STR_NO_IFFPARSE_LIB_ERR));
176			QuitEmulator();
177			}
178	cebix	1.1	AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
179			if (AslBase == NULL) {
180			ErrorAlert(GetString(STR_NO_ASL_LIB_ERR));
181			QuitEmulator();
182			}
183			P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
184
185	cebix	1.3	// Read preferences
186			PrefsInit();
187
188	cebix	1.1	// Open AHI
189			ahi_port = CreateMsgPort();
190			if (ahi_port) {
191			ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
192			if (ahi_io) {
193			ahi_io->ahir_Version = 2;
194			if (OpenDevice((UBYTE )AHINAME, AHI_NO_UNIT, (struct IORequest )ahi_io, 0) == 0) {
195			AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
196			}
197			}
198			}
199
200			// Init system routines
201			SysInit();
202
203			// Show preferences editor
204			if (!PrefsFindBool("nogui"))
205			if (!PrefsEditor())
206			QuitEmulator();
207
208			// Check start of Chip memory (because we need access to 0x0000..0x2000)
209			if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
210			ErrorAlert(GetString(STR_NO_PREPARE_EMUL_ERR));
211			QuitEmulator();
212			}
213
214			// Open timer.device
215			timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC \| MEMF_CLEAR);
216			if (timereq == NULL) {
217			ErrorAlert(GetString(STR_NO_MEM_ERR));
218			QuitEmulator();
219			}
220			if (OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timereq, 0)) {
221			ErrorAlert(GetString(STR_NO_TIMER_DEV_ERR));
222			QuitEmulator();
223			}
224			TimerBase = (struct Library *)timereq->tr_node.io_Device;
225
226			// Allocate scratch memory
227			ScratchMem = (uint32)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
228			if (ScratchMem == NULL) {
229			ErrorAlert(GetString(STR_NO_MEM_ERR));
230			QuitEmulator();
231			}
232			ScratchMem += SCRATCH_MEM_SIZE/2; // ScratchMem points to middle of block
233
234			// Create area for Mac RAM and ROM (ROM must be higher in memory,
235			// so we allocate one big chunk and put the ROM at the top of it)
236			RAMSize = PrefsFindInt32("ramsize") & 0xfff00000; // Round down to 1MB boundary
237			if (RAMSize < 1024*1024) {
238			WarningAlert(GetString(STR_SMALL_RAM_WARN));
239			RAMSize = 1024*1024;
240			}
241			RAMBaseHost = (uint8 *)AllocMem(RAMSize + 0x100000, MEMF_PUBLIC);
242			if (RAMBaseHost == NULL) {
243			ErrorAlert(GetString(STR_NO_MEM_ERR));
244			QuitEmulator();
245			}
246			RAMBaseMac = (uint32)RAMBaseHost;
247			D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
248			ROMBaseHost = RAMBaseHost + RAMSize;
249			ROMBaseMac = (uint32)ROMBaseHost;
250			D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));
251
252			// Get rom file path from preferences
253			const char *rom_path = PrefsFindString("rom");
254
255			// Load Mac ROM
256	cebix	1.3	BPTR rom_fh = Open(rom_path ? (char )rom_path : (char )ROM_FILE_NAME, MODE_OLDFILE);
257	cebix	1.1	if (rom_fh == NULL) {
258			ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
259			QuitEmulator();
260			}
261			printf(GetString(STR_READING_ROM_FILE));
262			Seek(rom_fh, 0, OFFSET_END);
263			ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
264			if (ROMSize != 5121024 && ROMSize != 10241024) {
265			ErrorAlert(GetString(STR_ROM_SIZE_ERR));
266			Close(rom_fh);
267			QuitEmulator();
268			}
269			Seek(rom_fh, 0, OFFSET_BEGINNING);
270			if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
271			ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
272			Close(rom_fh);
273			QuitEmulator();
274			}
275
276			// Set CPU and FPU type
277			UWORD attn = SysBase->AttnFlags;
278			CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
279			CPUIs68060 = attn & AFF_68060;
280			FPUType = attn & AFF_68881 ? 1 : 0;
281
282	cebix	1.2	// Initialize everything
283			if (!InitAll())
284	cebix	1.1	QuitEmulator();
285
286			// Move VBR away from 0 if neccessary
287			MoveVBR();
288
289			// Install trap handler
290			EmulatedSR = 0x2700;
291			OldTrapHandler = MainTask->tc_TrapCode;
292			MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;
293
294			// Allocate signal for interrupt emulation and install exception handler
295			IRQSig = AllocSignal(-1);
296			IRQSigMask = 1 << IRQSig;
297			OldExceptionHandler = MainTask->tc_ExceptCode;
298			MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
299			SetExcept(SIGBREAKF_CTRL_C \| IRQSigMask, SIGBREAKF_CTRL_C \| IRQSigMask);
300
301			// Start 60Hz process
302			tick_proc = CreateNewProcTags(
303	cebix	1.3	NP_Entry, (ULONG)tick_func,
304			NP_Name, (ULONG)"Basilisk II 60Hz",
305	cebix	1.1	NP_Priority, 5,
306			TAG_END
307			);
308
309			// Set task priority to -1 so we don't use all processing time
310			SetTaskPri(MainTask, -1);
311
312			// Swap stack to Mac RAM area
313			stack_swap.stk_Lower = RAMBaseHost;
314			stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
315			stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
316			StackSwap(&stack_swap);
317			stack_swapped = true;
318
319			// Jump to ROM boot routine
320			Start680x0();
321
322			QuitEmulator();
323			return 0;
324			}
325
326			void Start680x0(void)
327			{
328			typedef void (*rom_func)(void);
329			rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
330			fp();
331			}
332
333
334			/*
335			* Quit emulator (__saveds because it might be called from an exception)
336			*/
337
338	cebix	1.3	// Assembly entry point
339			void __saveds quit_emulator(void)
340			{
341			QuitEmulator();
342			}
343
344			void QuitEmulator(void)
345	cebix	1.1	{
346			// Restore stack
347			if (stack_swapped) {
348			stack_swapped = false;
349			StackSwap(&stack_swap);
350			}
351
352			// Remove exception handler
353			if (IRQSig >= 0) {
354			SetExcept(0, SIGBREAKF_CTRL_C \| IRQSigMask);
355			MainTask->tc_ExceptCode = OldExceptionHandler;
356			FreeSignal(IRQSig);
357			}
358
359			// Stop 60Hz thread
360			if (tick_proc) {
361			SetSignal(0, SIGF_SINGLE);
362			tick_proc_active = false;
363			Wait(SIGF_SINGLE);
364			}
365
366			// Remove trap handler
367			MainTask->tc_TrapCode = OldTrapHandler;
368
369	cebix	1.2	// Deinitialize everything
370			ExitAll();
371	cebix	1.1
372			// Delete RAM/ROM area
373			if (RAMBaseHost)
374			FreeMem(RAMBaseHost, RAMSize + 0x100000);
375
376			// Delete scratch memory area
377			if (ScratchMem)
378			FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);
379
380			// Close timer.device
381			if (TimerBase)
382			CloseDevice((struct IORequest *)timereq);
383			if (timereq)
384			FreeVec(timereq);
385
386			// Exit system routines
387			SysExit();
388
389			// Close AHI
390			if (AHIBase)
391			CloseDevice((struct IORequest *)ahi_io);
392			if (ahi_io)
393			DeleteIORequest((struct IORequest *)ahi_io);
394			if (ahi_port)
395			DeleteMsgPort(ahi_port);
396
397			// Exit preferences
398			PrefsExit();
399
400			// Close libraries
401			if (P96Base)
402			CloseLibrary(P96Base);
403			if (AslBase)
404			CloseLibrary(AslBase);
405	cebix	1.3	if (IFFParseBase)
406			CloseLibrary(IFFParseBase);
407	cebix	1.1	if (GadToolsBase)
408			CloseLibrary(GadToolsBase);
409	cebix	1.3	if (IntuitionBase)
410			CloseLibrary((struct Library *)IntuitionBase);
411			if (GfxBase)
412			CloseLibrary(GfxBase);
413	cebix	1.1
414			exit(0);
415			}
416
417
418			/*
419			* Code was patched, flush caches if neccessary (i.e. when using a real 680x0
420			* or a dynamically recompiling emulator)
421			*/
422
423			void FlushCodeCache(void *start, uint32 size)
424			{
425			CacheClearE(start, size, CACRF_ClearI \| CACRF_ClearD);
426			}
427
428
429			/*
430			* Interrupt flags (must be handled atomically!)
431			*/
432
433			uint32 InterruptFlags;
434
435			void SetInterruptFlag(uint32 flag)
436			{
437			AtomicOr(&InterruptFlags, flag);
438			}
439
440			void ClearInterruptFlag(uint32 flag)
441			{
442			AtomicAnd(&InterruptFlags, ~flag);
443			}
444
445			void TriggerInterrupt(void)
446			{
447			Signal(MainTask, IRQSigMask);
448			}
449
450
451			/*
452			* 60Hz thread
453			*/
454
455			static __saveds void tick_func(void)
456			{
457			int tick_counter = 0;
458			struct MsgPort *timer_port = NULL;
459			struct timerequest *timer_io = NULL;
460			ULONG timer_mask = 0;
461
462			// Start 60Hz timer
463			timer_port = CreateMsgPort();
464			if (timer_port) {
465			timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
466			if (timer_io) {
467			if (!OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timer_io, 0)) {
468			timer_mask = 1 << timer_port->mp_SigBit;
469			timer_io->tr_node.io_Command = TR_ADDREQUEST;
470			timer_io->tr_time.tv_secs = 0;
471			timer_io->tr_time.tv_micro = 16625;
472			SendIO((struct IORequest *)timer_io);
473			}
474			}
475			}
476
477			while (tick_proc_active) {
478
479			// Wait for timer tick
480			Wait(timer_mask);
481
482			// Restart timer
483			timer_io->tr_node.io_Command = TR_ADDREQUEST;
484			timer_io->tr_time.tv_secs = 0;
485			timer_io->tr_time.tv_micro = 16625;
486			SendIO((struct IORequest *)timer_io);
487
488			// Pseudo Mac 1Hz interrupt, update local time
489			if (++tick_counter > 60) {
490			tick_counter = 0;
491			WriteMacInt32(0x20c, TimerDateTime());
492			}
493
494			// Trigger 60Hz interrupt
495			SetInterruptFlag(INTFLAG_60HZ);
496			TriggerInterrupt();
497			}
498
499			// Stop timer
500			if (timer_io) {
501			if (!CheckIO((struct IORequest *)timer_io))
502			AbortIO((struct IORequest *)timer_io);
503			WaitIO((struct IORequest *)timer_io);
504			CloseDevice((struct IORequest *)timer_io);
505			DeleteIORequest(timer_io);
506			}
507			if (timer_port)
508			DeleteMsgPort(timer_port);
509
510			// Main task asked for termination, send signal
511			Forbid();
512			Signal(MainTask, SIGF_SINGLE);
513			}
514
515
516			/*
517			* Display error alert
518			*/
519
520			void ErrorAlert(const char *text)
521			{
522			if (PrefsFindBool("nogui")) {
523			printf(GetString(STR_SHELL_ERROR_PREFIX), text);
524			return;
525			}
526			EasyStruct req;
527			req.es_StructSize = sizeof(EasyStruct);
528			req.es_Flags = 0;
529			req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
530			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
531			req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
532	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
533	cebix	1.1	}
534
535
536			/*
537			* Display warning alert
538			*/
539
540			void WarningAlert(const char *text)
541			{
542			if (PrefsFindBool("nogui")) {
543			printf(GetString(STR_SHELL_WARNING_PREFIX), text);
544			return;
545			}
546			EasyStruct req;
547			req.es_StructSize = sizeof(EasyStruct);
548			req.es_Flags = 0;
549			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
550			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
551			req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
552	cebix	1.3	EasyRequest(NULL, &req, NULL, (ULONG)text);
553	cebix	1.1	}
554
555
556			/*
557			* Display choice alert
558			*/
559
560			bool ChoiceAlert(const char text, const char pos, const char *neg)
561			{
562			char str[256];
563			sprintf(str, "%s\|%s", pos, neg);
564			EasyStruct req;
565			req.es_StructSize = sizeof(EasyStruct);
566			req.es_Flags = 0;
567			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
568			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
569			req.es_GadgetFormat = (UBYTE *)str;
570	cebix	1.3	return EasyRequest(NULL, &req, NULL, (ULONG)text);
571	cebix	1.1	}
572
573
574			/*
575			* Illegal Instruction and Privilege Violation trap handlers
576			*/
577
578			struct trap_regs { // This must match the layout of M68kRegisters
579			uint32 d[8];
580			uint32 a[8];
581			uint16 sr;
582			uint32 pc;
583			};
584
585			void __saveds IllInstrHandler(trap_regs *r)
586			{
587			uint16 opcode = (uint16 )(r->pc);
588			if ((opcode & 0xff00) != 0x7100) {
589			printf("Illegal Instruction %04x at %08lx\n", (uint16 )(r->pc), r->pc);
590			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
591			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
592			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
593			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
594			"sr %04x\n",
595			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
596			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
597			r->sr);
598			QuitEmulator();
599			} else {
600			// Disable interrupts
601			uint16 sr = EmulatedSR;
602			EmulatedSR \|= 0x0700;
603
604			// Call opcode routine
605			EmulOp((uint16 )(r->pc), (M68kRegisters *)r);
606			r->pc += 2;
607
608			// Restore interrupts
609			EmulatedSR = sr;
610			if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
611			Signal(MainTask, IRQSigMask);
612			}
613			}
614
615			void __saveds PrivViolHandler(trap_regs *r)
616			{
617			printf("Privileged instruction %04x %04x at %08lx\n", (uint16 )(r->pc), (uint16 )(r->pc + 2), r->pc);
618			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
619			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
620			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
621			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
622			"sr %04x\n",
623			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
624			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
625			r->sr);
626			QuitEmulator();
627			}