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"


// Constants
static const char ROM_FILE_NAME[] = "ROM";
static const char __ver[] = "$VER: " VERSION_STRING " " __AMIGADATE__;
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 *GadToolsBase = 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;


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


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


/*
 *  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));

        // Read preferences
        PrefsInit();

        // Open libraries
        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();
        }
        AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
        if (AslBase == NULL) {
                ErrorAlert(GetString(STR_NO_ASL_LIB_ERR));
                QuitEmulator();
        }
        P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);

        // 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 : 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();
        }

        // Check ROM version
        if (!CheckROM()) {
                ErrorAlert(GetString(STR_UNSUPPORTED_ROM_TYPE_ERR));
                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;

        // Load XPRAM
        XPRAMInit();

        // Set boot volume
        int16 i16 = PrefsFindInt16("bootdrive");
        XPRAM[0x78] = i16 >> 8;
        XPRAM[0x79] = i16 & 0xff;
        i16 = PrefsFindInt16("bootdriver");
        XPRAM[0x7a] = i16 >> 8;
        XPRAM[0x7b] = i16 & 0xff;

        // Init drivers
        SonyInit();
        DiskInit();
        CDROMInit();
        SCSIInit();

        // Init network
        EtherInit();

        // Init serial ports
        SerialInit();

        // Init Time Manager
        TimerInit();

        // Init clipboard
        ClipInit();

        // Init audio
        AudioInit();

        // Init video
        if (!VideoInit(ROMVersion == ROM_VERSION_64K || ROMVersion == ROM_VERSION_PLUS || ROMVersion == ROM_VERSION_CLASSIC))
                QuitEmulator();

        // Install ROM patches
        if (!PatchROM()) {
                ErrorAlert(GetString(STR_UNSUPPORTED_ROM_TYPE_ERR));
                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, tick_func,
                NP_Name, "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)
 */

void __saveds 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;

        // Save XPRAM
        XPRAMExit();

        // Exit video
        VideoExit();

        // Exit audio
        AudioExit();

        // Exit clipboard
        ClipExit();

        // Exit Time Manager
        TimerExit();

        // Exit serial ports
        SerialExit();

        // Exit network
        EtherExit();

        // Exit drivers
        SCSIExit();
        CDROMExit();
        DiskExit();
        SonyExit();

        // 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 (GadToolsBase)
                CloseLibrary(GadToolsBase);

        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, 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, 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, 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:	1.1
Committed:	1999-10-03T14:16:25Z (25 years, 1 month ago) by cebix
Branch:	MAIN
Branch point for:	cebix
Log Message:	Initial revision
#	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			// Constants
60			static const char ROM_FILE_NAME[] = "ROM";
61			static const char __ver[] = "$VER: " VERSION_STRING " " __AMIGADATE__;
62			static const int SCRATCH_MEM_SIZE = 65536;
63
64
65			// RAM and ROM pointers
66			uint32 RAMBaseMac; // RAM base (Mac address space)
67			uint8 *RAMBaseHost; // RAM base (host address space)
68			uint32 RAMSize; // Size of RAM
69			uint32 ROMBaseMac; // ROM base (Mac address space)
70			uint8 *ROMBaseHost; // ROM base (host address space)
71			uint32 ROMSize; // Size of ROM
72
73
74			// CPU and FPU type, addressing mode
75			int CPUType;
76			bool CPUIs68060;
77			int FPUType;
78			bool TwentyFourBitAddressing;
79
80
81			// Global variables
82			extern ExecBase *SysBase;
83			struct Library *GadToolsBase = NULL;
84			struct Library *AslBase = NULL;
85			struct Library *P96Base = NULL;
86			struct Library *TimerBase = NULL;
87			struct Library *AHIBase = NULL;
88			struct Library *DiskBase = NULL;
89
90			struct Task *MainTask; // Our task
91			uint32 ScratchMem = NULL; // Scratch memory for Mac ROM writes
92			APTR OldTrapHandler = NULL; // Old trap handler
93			APTR OldExceptionHandler = NULL; // Old exception handler
94			BYTE IRQSig = -1; // "Interrupt" signal number
95			ULONG IRQSigMask = 0; // "Interrupt" signal mask
96
97			static struct timerequest *timereq = NULL; // IORequest for timer
98
99			static struct MsgPort *ahi_port = NULL; // Port for AHI
100			static struct AHIRequest *ahi_io = NULL; // IORequest for AHI
101
102			static struct Process *tick_proc = NULL; // 60Hz process
103			static volatile bool tick_proc_active = true; // Flag for quitting the 60Hz process
104
105			static bool stack_swapped = false; // Stack swapping
106			static StackSwapStruct stack_swap;
107
108
109			// Prototypes
110			static void jump_to_rom(void);
111			static void tick_func(void);
112
113
114			// Assembly functions
115			struct trap_regs;
116			extern "C" void AtomicAnd(uint32 *p, uint32 val);
117			extern "C" void AtomicOr(uint32 *p, uint32 val);
118			extern "C" void MoveVBR(void);
119			extern "C" void TrapHandlerAsm(void);
120			extern "C" void ExceptionHandlerAsm(void);
121			extern "C" void IllInstrHandler(trap_regs *regs);
122			extern "C" void PrivViolHandler(trap_regs *regs);
123			uint16 EmulatedSR; // Emulated SR (supervisor bit and interrupt mask)
124
125
126			/*
127			* Main program
128			*/
129
130			int main(void)
131			{
132			// Initialize variables
133			RAMBaseHost = NULL;
134			ROMBaseHost = NULL;
135			MainTask = FindTask(NULL);
136			struct DateStamp ds;
137			DateStamp(&ds);
138			srand(ds.ds_Tick);
139
140			// Print some info
141			printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
142			printf(" %s\n", GetString(STR_ABOUT_TEXT2));
143
144			// Read preferences
145			PrefsInit();
146
147			// Open libraries
148			DiskBase = (struct Library )OpenResource((UBYTE )"disk.resource");
149			if (DiskBase == NULL)
150			QuitEmulator();
151			GadToolsBase = OpenLibrary((UBYTE *)"gadtools.library", 39);
152			if (GadToolsBase == NULL) {
153			ErrorAlert(GetString(STR_NO_GADTOOLS_LIB_ERR));
154			QuitEmulator();
155			}
156			AslBase = OpenLibrary((UBYTE *)"asl.library", 36);
157			if (AslBase == NULL) {
158			ErrorAlert(GetString(STR_NO_ASL_LIB_ERR));
159			QuitEmulator();
160			}
161			P96Base = OpenLibrary((UBYTE *)"Picasso96API.library", 2);
162
163			// Open AHI
164			ahi_port = CreateMsgPort();
165			if (ahi_port) {
166			ahi_io = (struct AHIRequest *)CreateIORequest(ahi_port, sizeof(struct AHIRequest));
167			if (ahi_io) {
168			ahi_io->ahir_Version = 2;
169			if (OpenDevice((UBYTE )AHINAME, AHI_NO_UNIT, (struct IORequest )ahi_io, 0) == 0) {
170			AHIBase = (struct Library *)ahi_io->ahir_Std.io_Device;
171			}
172			}
173			}
174
175			// Init system routines
176			SysInit();
177
178			// Show preferences editor
179			if (!PrefsFindBool("nogui"))
180			if (!PrefsEditor())
181			QuitEmulator();
182
183			// Check start of Chip memory (because we need access to 0x0000..0x2000)
184			if ((uint32)FindName(&SysBase->MemList, (UBYTE *)"chip memory") < 0x2000) {
185			ErrorAlert(GetString(STR_NO_PREPARE_EMUL_ERR));
186			QuitEmulator();
187			}
188
189			// Open timer.device
190			timereq = (struct timerequest *)AllocVec(sizeof(timerequest), MEMF_PUBLIC \| MEMF_CLEAR);
191			if (timereq == NULL) {
192			ErrorAlert(GetString(STR_NO_MEM_ERR));
193			QuitEmulator();
194			}
195			if (OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timereq, 0)) {
196			ErrorAlert(GetString(STR_NO_TIMER_DEV_ERR));
197			QuitEmulator();
198			}
199			TimerBase = (struct Library *)timereq->tr_node.io_Device;
200
201			// Allocate scratch memory
202			ScratchMem = (uint32)AllocMem(SCRATCH_MEM_SIZE, MEMF_PUBLIC);
203			if (ScratchMem == NULL) {
204			ErrorAlert(GetString(STR_NO_MEM_ERR));
205			QuitEmulator();
206			}
207			ScratchMem += SCRATCH_MEM_SIZE/2; // ScratchMem points to middle of block
208
209			// Create area for Mac RAM and ROM (ROM must be higher in memory,
210			// so we allocate one big chunk and put the ROM at the top of it)
211			RAMSize = PrefsFindInt32("ramsize") & 0xfff00000; // Round down to 1MB boundary
212			if (RAMSize < 1024*1024) {
213			WarningAlert(GetString(STR_SMALL_RAM_WARN));
214			RAMSize = 1024*1024;
215			}
216			RAMBaseHost = (uint8 *)AllocMem(RAMSize + 0x100000, MEMF_PUBLIC);
217			if (RAMBaseHost == NULL) {
218			ErrorAlert(GetString(STR_NO_MEM_ERR));
219			QuitEmulator();
220			}
221			RAMBaseMac = (uint32)RAMBaseHost;
222			D(bug("Mac RAM starts at %08lx\n", RAMBaseHost));
223			ROMBaseHost = RAMBaseHost + RAMSize;
224			ROMBaseMac = (uint32)ROMBaseHost;
225			D(bug("Mac ROM starts at %08lx\n", ROMBaseHost));
226
227			// Get rom file path from preferences
228			const char *rom_path = PrefsFindString("rom");
229
230			// Load Mac ROM
231			BPTR rom_fh = Open(rom_path ? (char *)rom_path : ROM_FILE_NAME, MODE_OLDFILE);
232			if (rom_fh == NULL) {
233			ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
234			QuitEmulator();
235			}
236			printf(GetString(STR_READING_ROM_FILE));
237			Seek(rom_fh, 0, OFFSET_END);
238			ROMSize = Seek(rom_fh, 0, OFFSET_CURRENT);
239			if (ROMSize != 5121024 && ROMSize != 10241024) {
240			ErrorAlert(GetString(STR_ROM_SIZE_ERR));
241			Close(rom_fh);
242			QuitEmulator();
243			}
244			Seek(rom_fh, 0, OFFSET_BEGINNING);
245			if (Read(rom_fh, ROMBaseHost, ROMSize) != ROMSize) {
246			ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
247			Close(rom_fh);
248			QuitEmulator();
249			}
250
251			// Check ROM version
252			if (!CheckROM()) {
253			ErrorAlert(GetString(STR_UNSUPPORTED_ROM_TYPE_ERR));
254			QuitEmulator();
255			}
256
257			// Set CPU and FPU type
258			UWORD attn = SysBase->AttnFlags;
259			CPUType = attn & AFF_68040 ? 4 : (attn & AFF_68030 ? 3 : 2);
260			CPUIs68060 = attn & AFF_68060;
261			FPUType = attn & AFF_68881 ? 1 : 0;
262
263			// Load XPRAM
264			XPRAMInit();
265
266			// Set boot volume
267			int16 i16 = PrefsFindInt16("bootdrive");
268			XPRAM[0x78] = i16 >> 8;
269			XPRAM[0x79] = i16 & 0xff;
270			i16 = PrefsFindInt16("bootdriver");
271			XPRAM[0x7a] = i16 >> 8;
272			XPRAM[0x7b] = i16 & 0xff;
273
274			// Init drivers
275			SonyInit();
276			DiskInit();
277			CDROMInit();
278			SCSIInit();
279
280			// Init network
281			EtherInit();
282
283			// Init serial ports
284			SerialInit();
285
286			// Init Time Manager
287			TimerInit();
288
289			// Init clipboard
290			ClipInit();
291
292			// Init audio
293			AudioInit();
294
295			// Init video
296			if (!VideoInit(ROMVersion == ROM_VERSION_64K \|\| ROMVersion == ROM_VERSION_PLUS \|\| ROMVersion == ROM_VERSION_CLASSIC))
297			QuitEmulator();
298
299			// Install ROM patches
300			if (!PatchROM()) {
301			ErrorAlert(GetString(STR_UNSUPPORTED_ROM_TYPE_ERR));
302			QuitEmulator();
303			}
304
305			// Move VBR away from 0 if neccessary
306			MoveVBR();
307
308			// Install trap handler
309			EmulatedSR = 0x2700;
310			OldTrapHandler = MainTask->tc_TrapCode;
311			MainTask->tc_TrapCode = (APTR)TrapHandlerAsm;
312
313			// Allocate signal for interrupt emulation and install exception handler
314			IRQSig = AllocSignal(-1);
315			IRQSigMask = 1 << IRQSig;
316			OldExceptionHandler = MainTask->tc_ExceptCode;
317			MainTask->tc_ExceptCode = (APTR)ExceptionHandlerAsm;
318			SetExcept(SIGBREAKF_CTRL_C \| IRQSigMask, SIGBREAKF_CTRL_C \| IRQSigMask);
319
320			// Start 60Hz process
321			tick_proc = CreateNewProcTags(
322			NP_Entry, tick_func,
323			NP_Name, "Basilisk II 60Hz",
324			NP_Priority, 5,
325			TAG_END
326			);
327
328			// Set task priority to -1 so we don't use all processing time
329			SetTaskPri(MainTask, -1);
330
331			// Swap stack to Mac RAM area
332			stack_swap.stk_Lower = RAMBaseHost;
333			stack_swap.stk_Upper = (ULONG)RAMBaseHost + RAMSize;
334			stack_swap.stk_Pointer = RAMBaseHost + 0x8000;
335			StackSwap(&stack_swap);
336			stack_swapped = true;
337
338			// Jump to ROM boot routine
339			Start680x0();
340
341			QuitEmulator();
342			return 0;
343			}
344
345			void Start680x0(void)
346			{
347			typedef void (*rom_func)(void);
348			rom_func fp = (rom_func)(ROMBaseHost + 0x2a);
349			fp();
350			}
351
352
353			/*
354			* Quit emulator (__saveds because it might be called from an exception)
355			*/
356
357			void __saveds QuitEmulator(void)
358			{
359			// Restore stack
360			if (stack_swapped) {
361			stack_swapped = false;
362			StackSwap(&stack_swap);
363			}
364
365			// Remove exception handler
366			if (IRQSig >= 0) {
367			SetExcept(0, SIGBREAKF_CTRL_C \| IRQSigMask);
368			MainTask->tc_ExceptCode = OldExceptionHandler;
369			FreeSignal(IRQSig);
370			}
371
372			// Stop 60Hz thread
373			if (tick_proc) {
374			SetSignal(0, SIGF_SINGLE);
375			tick_proc_active = false;
376			Wait(SIGF_SINGLE);
377			}
378
379			// Remove trap handler
380			MainTask->tc_TrapCode = OldTrapHandler;
381
382			// Save XPRAM
383			XPRAMExit();
384
385			// Exit video
386			VideoExit();
387
388			// Exit audio
389			AudioExit();
390
391			// Exit clipboard
392			ClipExit();
393
394			// Exit Time Manager
395			TimerExit();
396
397			// Exit serial ports
398			SerialExit();
399
400			// Exit network
401			EtherExit();
402
403			// Exit drivers
404			SCSIExit();
405			CDROMExit();
406			DiskExit();
407			SonyExit();
408
409			// Delete RAM/ROM area
410			if (RAMBaseHost)
411			FreeMem(RAMBaseHost, RAMSize + 0x100000);
412
413			// Delete scratch memory area
414			if (ScratchMem)
415			FreeMem((void *)(ScratchMem - SCRATCH_MEM_SIZE/2), SCRATCH_MEM_SIZE);
416
417			// Close timer.device
418			if (TimerBase)
419			CloseDevice((struct IORequest *)timereq);
420			if (timereq)
421			FreeVec(timereq);
422
423			// Exit system routines
424			SysExit();
425
426			// Close AHI
427			if (AHIBase)
428			CloseDevice((struct IORequest *)ahi_io);
429			if (ahi_io)
430			DeleteIORequest((struct IORequest *)ahi_io);
431			if (ahi_port)
432			DeleteMsgPort(ahi_port);
433
434			// Exit preferences
435			PrefsExit();
436
437			// Close libraries
438			if (P96Base)
439			CloseLibrary(P96Base);
440			if (AslBase)
441			CloseLibrary(AslBase);
442			if (GadToolsBase)
443			CloseLibrary(GadToolsBase);
444
445			exit(0);
446			}
447
448
449			/*
450			* Code was patched, flush caches if neccessary (i.e. when using a real 680x0
451			* or a dynamically recompiling emulator)
452			*/
453
454			void FlushCodeCache(void *start, uint32 size)
455			{
456			CacheClearE(start, size, CACRF_ClearI \| CACRF_ClearD);
457			}
458
459
460			/*
461			* Interrupt flags (must be handled atomically!)
462			*/
463
464			uint32 InterruptFlags;
465
466			void SetInterruptFlag(uint32 flag)
467			{
468			AtomicOr(&InterruptFlags, flag);
469			}
470
471			void ClearInterruptFlag(uint32 flag)
472			{
473			AtomicAnd(&InterruptFlags, ~flag);
474			}
475
476			void TriggerInterrupt(void)
477			{
478			Signal(MainTask, IRQSigMask);
479			}
480
481
482			/*
483			* 60Hz thread
484			*/
485
486			static __saveds void tick_func(void)
487			{
488			int tick_counter = 0;
489			struct MsgPort *timer_port = NULL;
490			struct timerequest *timer_io = NULL;
491			ULONG timer_mask = 0;
492
493			// Start 60Hz timer
494			timer_port = CreateMsgPort();
495			if (timer_port) {
496			timer_io = (struct timerequest *)CreateIORequest(timer_port, sizeof(struct timerequest));
497			if (timer_io) {
498			if (!OpenDevice((UBYTE )TIMERNAME, UNIT_MICROHZ, (struct IORequest )timer_io, 0)) {
499			timer_mask = 1 << timer_port->mp_SigBit;
500			timer_io->tr_node.io_Command = TR_ADDREQUEST;
501			timer_io->tr_time.tv_secs = 0;
502			timer_io->tr_time.tv_micro = 16625;
503			SendIO((struct IORequest *)timer_io);
504			}
505			}
506			}
507
508			while (tick_proc_active) {
509
510			// Wait for timer tick
511			Wait(timer_mask);
512
513			// Restart timer
514			timer_io->tr_node.io_Command = TR_ADDREQUEST;
515			timer_io->tr_time.tv_secs = 0;
516			timer_io->tr_time.tv_micro = 16625;
517			SendIO((struct IORequest *)timer_io);
518
519			// Pseudo Mac 1Hz interrupt, update local time
520			if (++tick_counter > 60) {
521			tick_counter = 0;
522			WriteMacInt32(0x20c, TimerDateTime());
523			}
524
525			// Trigger 60Hz interrupt
526			SetInterruptFlag(INTFLAG_60HZ);
527			TriggerInterrupt();
528			}
529
530			// Stop timer
531			if (timer_io) {
532			if (!CheckIO((struct IORequest *)timer_io))
533			AbortIO((struct IORequest *)timer_io);
534			WaitIO((struct IORequest *)timer_io);
535			CloseDevice((struct IORequest *)timer_io);
536			DeleteIORequest(timer_io);
537			}
538			if (timer_port)
539			DeleteMsgPort(timer_port);
540
541			// Main task asked for termination, send signal
542			Forbid();
543			Signal(MainTask, SIGF_SINGLE);
544			}
545
546
547			/*
548			* Display error alert
549			*/
550
551			void ErrorAlert(const char *text)
552			{
553			if (PrefsFindBool("nogui")) {
554			printf(GetString(STR_SHELL_ERROR_PREFIX), text);
555			return;
556			}
557			EasyStruct req;
558			req.es_StructSize = sizeof(EasyStruct);
559			req.es_Flags = 0;
560			req.es_Title = (UBYTE *)GetString(STR_ERROR_ALERT_TITLE);
561			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_ERROR_PREFIX);
562			req.es_GadgetFormat = (UBYTE *)GetString(STR_QUIT_BUTTON);
563			EasyRequest(NULL, &req, NULL, text);
564			}
565
566
567			/*
568			* Display warning alert
569			*/
570
571			void WarningAlert(const char *text)
572			{
573			if (PrefsFindBool("nogui")) {
574			printf(GetString(STR_SHELL_WARNING_PREFIX), text);
575			return;
576			}
577			EasyStruct req;
578			req.es_StructSize = sizeof(EasyStruct);
579			req.es_Flags = 0;
580			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
581			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
582			req.es_GadgetFormat = (UBYTE *)GetString(STR_OK_BUTTON);
583			EasyRequest(NULL, &req, NULL, text);
584			}
585
586
587			/*
588			* Display choice alert
589			*/
590
591			bool ChoiceAlert(const char text, const char pos, const char *neg)
592			{
593			char str[256];
594			sprintf(str, "%s\|%s", pos, neg);
595			EasyStruct req;
596			req.es_StructSize = sizeof(EasyStruct);
597			req.es_Flags = 0;
598			req.es_Title = (UBYTE *)GetString(STR_WARNING_ALERT_TITLE);
599			req.es_TextFormat = (UBYTE *)GetString(STR_GUI_WARNING_PREFIX);
600			req.es_GadgetFormat = (UBYTE *)str;
601			return EasyRequest(NULL, &req, NULL, text);
602			}
603
604
605			/*
606			* Illegal Instruction and Privilege Violation trap handlers
607			*/
608
609			struct trap_regs { // This must match the layout of M68kRegisters
610			uint32 d[8];
611			uint32 a[8];
612			uint16 sr;
613			uint32 pc;
614			};
615
616			void __saveds IllInstrHandler(trap_regs *r)
617			{
618			uint16 opcode = (uint16 )(r->pc);
619			if ((opcode & 0xff00) != 0x7100) {
620			printf("Illegal Instruction %04x at %08lx\n", (uint16 )(r->pc), r->pc);
621			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
622			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
623			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
624			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
625			"sr %04x\n",
626			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
627			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
628			r->sr);
629			QuitEmulator();
630			} else {
631			// Disable interrupts
632			uint16 sr = EmulatedSR;
633			EmulatedSR \|= 0x0700;
634
635			// Call opcode routine
636			EmulOp((uint16 )(r->pc), (M68kRegisters *)r);
637			r->pc += 2;
638
639			// Restore interrupts
640			EmulatedSR = sr;
641			if ((EmulatedSR & 0x0700) == 0 && InterruptFlags)
642			Signal(MainTask, IRQSigMask);
643			}
644			}
645
646			void __saveds PrivViolHandler(trap_regs *r)
647			{
648			printf("Privileged instruction %04x %04x at %08lx\n", (uint16 )(r->pc), (uint16 )(r->pc + 2), r->pc);
649			printf("d0 %08lx d1 %08lx d2 %08lx d3 %08lx\n"
650			"d4 %08lx d5 %08lx d6 %08lx d7 %08lx\n"
651			"a0 %08lx a1 %08lx a2 %08lx a3 %08lx\n"
652			"a4 %08lx a5 %08lx a6 %08lx a7 %08lx\n"
653			"sr %04x\n",
654			r->d[0], r->d[1], r->d[2], r->d[3], r->d[4], r->d[5], r->d[6], r->d[7],
655			r->a[0], r->a[1], r->a[2], r->a[3], r->a[4], r->a[5], r->a[6], r->a[7],
656			r->sr);
657			QuitEmulator();
658			}