src/Windows/main_windows.cpp

/*
 *  main_windows.cpp - Emulation core, Windows implementation
 *
 *  SheepShaver (C) 1997-2005 Christian Bauer and Marc Hellwig
 *
 *  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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <SDL.h>

#include "sysdeps.h"
#include "main.h"
#include "version.h"
#include "prefs.h"
#include "prefs_editor.h"
#include "cpu_emulation.h"
#include "emul_op.h"
#include "xlowmem.h"
#include "xpram.h"
#include "timer.h"
#include "adb.h"
#include "video.h"
#include "sys.h"
#include "macos_util.h"
#include "rom_patches.h"
#include "user_strings.h"
#include "vm_alloc.h"
#include "sigsegv.h"
#include "util_windows.h"

#define DEBUG 0
#include "debug.h"

#ifdef ENABLE_MON
#include "mon.h"
#endif


// Constants
const char ROM_FILE_NAME[] = "ROM";
const char ROM_FILE_NAME2[] = "Mac OS ROM";

const uintptr RAM_BASE = 0x10000000;            // Base address of RAM
const uint32 SIG_STACK_SIZE = 0x10000;          // Size of signal stack


// Global variables (exported)
uint32 RAMBase;                 // Base address of Mac RAM
uint32 RAMSize;                 // Size of Mac RAM
uint32 KernelDataAddr;  // Address of Kernel Data
uint32 BootGlobsAddr;   // Address of BootGlobs structure at top of Mac RAM
uint32 DRCacheAddr;             // Address of DR Cache
uint32 PVR;                             // Theoretical PVR
int64 CPUClockSpeed;    // Processor clock speed (Hz)
int64 BusClockSpeed;    // Bus clock speed (Hz)
int64 TimebaseSpeed;    // Timebase clock speed (Hz)
uint8 *RAMBaseHost;             // Base address of Mac RAM (host address space)
uint8 *ROMBaseHost;             // Base address of Mac ROM (host address space)


// Global variables
static bool lm_area_mapped = false;                     // Flag: Low Memory area mmap()ped
static int kernel_area = -1;                            // SHM ID of Kernel Data area
static bool rom_area_mapped = false;            // Flag: Mac ROM mmap()ped
static bool ram_area_mapped = false;            // Flag: Mac RAM mmap()ped
static bool dr_cache_area_mapped = false;       // Flag: Mac DR Cache mmap()ped
static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
static KernelData *kernel_data;                         // Pointer to Kernel Data
static EmulatorData *emulator_data;

static uint8 last_xpram[XPRAM_SIZE];            // Buffer for monitoring XPRAM changes
static bool nvram_thread_active = false;        // Flag: NVRAM watchdog installed
static volatile bool nvram_thread_cancel;       // Flag: Cancel NVRAM thread
static HANDLE nvram_thread = NULL;                      // NVRAM watchdog
static bool tick_thread_active = false;         // Flag: MacOS thread installed
static volatile bool tick_thread_cancel;        // Flag: Cancel 60Hz thread
static HANDLE tick_thread = NULL;                       // 60Hz thread
static HANDLE emul_thread = NULL;                       // MacOS thread
static uintptr sig_stack = 0;                           // Stack for PowerPC interrupt routine

uint32  SheepMem::page_size;                            // Size of a native page
uintptr SheepMem::zero_page = 0;                        // Address of ro page filled in with zeros
uintptr SheepMem::base = 0x60000000;            // Address of SheepShaver data
uintptr SheepMem::proc;                                         // Bottom address of SheepShave procedures
uintptr SheepMem::data;                                         // Top of SheepShaver data (stack like storage)


// Prototypes
static bool kernel_data_init(void);
static void kernel_data_exit(void);
static void Quit(void);
static DWORD WINAPI nvram_func(void *arg);
static DWORD WINAPI tick_func(void *arg);

static void jump_to_rom(uint32 entry);
extern void emul_ppc(uint32 start);
extern void init_emul_ppc(void);
extern void exit_emul_ppc(void);
sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);


/*
 *  Return signal stack base
 */

uintptr SignalStackBase(void)
{
        return sig_stack + SIG_STACK_SIZE;
}


/*
 *  Memory management helpers
 */

static inline int vm_mac_acquire(uint32 addr, uint32 size)
{
        return vm_acquire_fixed(Mac2HostAddr(addr), size);
}

static inline int vm_mac_release(uint32 addr, uint32 size)
{
        return vm_release(Mac2HostAddr(addr), size);
}


/*
 *  Main program
 */

static void usage(const char *prg_name)
{
        printf("Usage: %s [OPTION...]\n", prg_name);
        printf("\nUnix options:\n");
        printf("  --display STRING\n    X display to use\n");
        PrefsPrintUsage();
        exit(0);
}

int main(int argc, char **argv)
{
        char str[256];
        int16 i16;
        HANDLE rom_fh;
        const char *rom_path;
        uint32 rom_size;
        DWORD actual;
        uint8 *rom_tmp;

        // Initialize variables
        RAMBase = 0;
        tzset();

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

        // Read preferences
        PrefsInit(argc, argv);

        // Parse command line arguments
        for (int i=1; i<argc; i++) {
                if (strcmp(argv[i], "--help") == 0) {
                        usage(argv[0]);
                } else if (argv[i][0] == '-') {
                        fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
                        usage(argv[0]);
                }
        }

        // Initialize SDL system
        int sdl_flags = 0;
#ifdef USE_SDL_VIDEO
        sdl_flags |= SDL_INIT_VIDEO;
#endif
#ifdef USE_SDL_AUDIO
        sdl_flags |= SDL_INIT_AUDIO;
#endif
        assert(sdl_flags != 0);
        if (SDL_Init(sdl_flags) == -1) {
                char str[256];
                sprintf(str, "Could not initialize SDL: %s.\n", SDL_GetError());
                ErrorAlert(str);
                goto quit;
        }
        atexit(SDL_Quit);

#ifdef ENABLE_MON
        // Initialize mon
        mon_init();
#endif

        // Install SIGSEGV handler for CPU emulator
        if (!sigsegv_install_handler(sigsegv_handler)) {
                sprintf(str, GetString(STR_SIGSEGV_INSTALL_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }

        // Initialize VM system
        vm_init();

        // Get system info
        PVR = 0x00040000;                       // Default: 604
        CPUClockSpeed = 100000000;      // Default: 100MHz
        BusClockSpeed = 100000000;      // Default: 100MHz
        TimebaseSpeed =  25000000;      // Default:  25MHz
        PVR = 0x000c0000;                       // Default: 7400 (with AltiVec)
        D(bug("PVR: %08x (assumed)\n", PVR));

        // Init system routines
        SysInit();

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

        // Create Low Memory area (0x0000..0x3000)
        if (vm_mac_acquire(0, 0x3000) < 0) {
                sprintf(str, GetString(STR_LOW_MEM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        lm_area_mapped = true;

        // Create areas for Kernel Data
        if (!kernel_data_init())
                goto quit;
        kernel_data = (KernelData *)Mac2HostAddr(KERNEL_DATA_BASE);
        emulator_data = &kernel_data->ed;
        KernelDataAddr = KERNEL_DATA_BASE;
        D(bug("Kernel Data at %p (%08x)\n", kernel_data, KERNEL_DATA_BASE));
        D(bug("Emulator Data at %p (%08x)\n", emulator_data, KERNEL_DATA_BASE + offsetof(KernelData, ed)));

        // Create area for DR Cache
        if (vm_mac_acquire(DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
                sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        dr_emulator_area_mapped = true;
        if (vm_mac_acquire(DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
                sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        dr_cache_area_mapped = true;
        DRCacheAddr = (uint32)Mac2HostAddr(DR_CACHE_BASE);
        D(bug("DR Cache at %p (%08x)\n", DRCacheAddr, DR_CACHE_BASE));

        // Create area for SheepShaver data
        if (!SheepMem::Init()) {
                sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }

        // Create area for Mac ROM
        if (vm_mac_acquire(ROM_BASE, ROM_AREA_SIZE) < 0) {
                sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        ROMBaseHost = Mac2HostAddr(ROM_BASE);
        rom_area_mapped = true;
        D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROM_BASE));

        // Create area for Mac RAM
        RAMSize = PrefsFindInt32("ramsize");
        if (RAMSize < 8*1024*1024) {
                WarningAlert(GetString(STR_SMALL_RAM_WARN));
                RAMSize = 8*1024*1024;
        }

        if (vm_mac_acquire(RAM_BASE, RAMSize) < 0) {
                sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        RAMBaseHost = Mac2HostAddr(RAM_BASE);
        RAMBase = RAM_BASE;
        ram_area_mapped = true;
        D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));

        if (RAMBase > ROM_BASE) {
                ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
                goto quit;
        }

        // Load Mac ROM
        rom_path = PrefsFindString("rom");
        rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME,
                                                GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                                FILE_ATTRIBUTE_NORMAL, NULL);

        if (rom_fh == INVALID_HANDLE_VALUE) {
                rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME2,
                                                        GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                                        FILE_ATTRIBUTE_NORMAL, NULL);

                if (rom_fh == INVALID_HANDLE_VALUE) {
                        ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
                        goto quit;
                }
        }
        printf(GetString(STR_READING_ROM_FILE));
        rom_size = GetFileSize(rom_fh, NULL);
        rom_tmp = new uint8[ROM_SIZE];
        ReadFile(rom_fh, (void *)rom_tmp, ROM_SIZE, &actual, NULL);
        CloseHandle(rom_fh);
        
        // Decode Mac ROM
        if (!DecodeROM(rom_tmp, actual)) {
                if (rom_size != 4*1024*1024) {
                        ErrorAlert(GetString(STR_ROM_SIZE_ERR));
                        goto quit;
                } else {
                        ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
                        goto quit;
                }
        }
        delete[] rom_tmp;

        // Initialize everything
        if (!InitAll())
                goto quit;
        D(bug("Initialization complete\n"));

        // Write protect ROM
        vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ);

        // Start 60Hz thread
        tick_thread_cancel = false;
        tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
        SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
        D(bug("Tick thread installed (%ld)\n", tick_thread));

        // Start NVRAM watchdog thread
        memcpy(last_xpram, XPRAM, XPRAM_SIZE);
        nvram_thread_cancel = false;
        nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
        SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
        D(bug("NVRAM thread installed (%ld)\n", nvram_thread));

        // Get my thread ID and jump to ROM boot routine
        emul_thread = GetCurrentThread();
        D(bug("Jumping to ROM\n"));
        jump_to_rom(ROM_BASE + 0x310000);
        D(bug("Returned from ROM\n"));

quit:
        Quit();
        return 0;
}


/*
 *  Cleanup and quit
 */

static void Quit(void)
{
        // Exit PowerPC emulation
        exit_emul_ppc();

        // Stop 60Hz thread
        if (tick_thread_active) {
                tick_thread_cancel = true;
                wait_thread(tick_thread);
        }

        // Stop NVRAM watchdog thread
        if (nvram_thread_active) {
                nvram_thread_cancel = true;
                wait_thread(nvram_thread);
        }

        // Deinitialize everything
        ExitAll();

        // Delete SheepShaver globals
        SheepMem::Exit();

        // Delete RAM area
        if (ram_area_mapped)
                vm_mac_release(RAM_BASE, RAMSize);

        // Delete ROM area
        if (rom_area_mapped)
                vm_mac_release(ROM_BASE, ROM_AREA_SIZE);

        // Delete DR cache areas
        if (dr_emulator_area_mapped)
                vm_mac_release(DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
        if (dr_cache_area_mapped)
                vm_mac_release(DR_CACHE_BASE, DR_CACHE_SIZE);

        // Delete Kernel Data area
        kernel_data_exit();

        // Delete Low Memory area
        if (lm_area_mapped)
                vm_mac_release(0, 0x3000);

        // Exit system routines
        SysExit();

        // Exit preferences
        PrefsExit();

#ifdef ENABLE_MON
        // Exit mon
        mon_exit();
#endif

        exit(0);
}


/*
 *  Initialize Kernel Data segments
 */

static HANDLE kernel_handle;                            // Shared memory handle for Kernel Data
static DWORD allocation_granule;                        // Minimum size of allocateable are (64K)
static DWORD kernel_area_size;                          // Size of Kernel Data area

static bool kernel_data_init(void)
{
        char str[256];
        SYSTEM_INFO si;
        GetSystemInfo(&si);
        allocation_granule = si.dwAllocationGranularity;
        kernel_area_size = (KERNEL_AREA_SIZE + allocation_granule - 1) & -allocation_granule;

        char rcs[10];
        LPVOID kernel_addr;
        kernel_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, kernel_area_size, NULL);
        if (kernel_handle == NULL) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD_SHMGET_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule);
        if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD_SHMAT_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule);
        if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ | FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
                sprintf(rcs, "%d", GetLastError());
                sprintf(str, GetString(STR_KD2_SHMAT_ERR), rcs);
                ErrorAlert(str);
                return false;
        }
        return true;
}


/*
 *  Deallocate Kernel Data segments
 */

static void kernel_data_exit(void)
{
        if (kernel_handle) {
                UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule));
                UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule));
                CloseHandle(kernel_handle);
        }
}


/*
 *  Jump into Mac ROM, start 680x0 emulator
 */

void jump_to_rom(uint32 entry)
{
        init_emul_ppc();
        emul_ppc(entry);
}


/*
 *  Quit emulator (cause return from jump_to_rom)
 */

void QuitEmulator(void)
{
        Quit();
}


/*
 *  Pause/resume emulator
 */

void PauseEmulator(void)
{
        SuspendThread(emul_thread);
}

void ResumeEmulator(void)
{
        ResumeThread(emul_thread);
}


/*
 *  Dump 68k registers
 */

void Dump68kRegs(M68kRegisters *r)
{
        // Display 68k registers
        for (int i=0; i<8; i++) {
                printf("d%d: %08x", i, r->d[i]);
                if (i == 3 || i == 7)
                        printf("\n");
                else
                        printf(", ");
        }
        for (int i=0; i<8; i++) {
                printf("a%d: %08x", i, r->a[i]);
                if (i == 3 || i == 7)
                        printf("\n");
                else
                        printf(", ");
        }
}


/*
 *  Make code executable
 */

void MakeExecutable(int dummy, uint32 start, uint32 length)
{
        if ((start >= ROM_BASE) && (start < (ROM_BASE + ROM_SIZE)))
                return;
        FlushCodeCache(start, start + length);
}


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

static void nvram_watchdog(void)
{
        if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
                memcpy(last_xpram, XPRAM, XPRAM_SIZE);
                SaveXPRAM();
        }
}

static DWORD nvram_func(void *arg)
{
        while (!nvram_thread_cancel) {
                for (int i=0; i<60 && !nvram_thread_cancel; i++)
                        Delay_usec(999999);             // Only wait 1 second so we quit promptly when nvram_thread_cancel becomes true
                nvram_watchdog();
        }
        return 0;
}


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

static DWORD tick_func(void *arg)
{
        int tick_counter = 0;
        uint64 start = GetTicks_usec();
        int64 ticks = 0;
        uint64 next = GetTicks_usec();

        while (!tick_thread_cancel) {

                // Wait
                next += 16625;
                int64 delay = next - GetTicks_usec();
                if (delay > 0)
                        Delay_usec(delay);
                else if (delay < -16625)
                        next = GetTicks_usec();
                ticks++;

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

                // Trigger 60Hz interrupt
                if (ReadMacInt32(XLM_IRQ_NEST) == 0) {
                        SetInterruptFlag(INTFLAG_VIA);
                        TriggerInterrupt();
                }
        }

        uint64 end = GetTicks_usec();
        D(bug("%Ld ticks in %Ld usec = %f ticks/sec\n", ticks, end - start, ticks * 1000000.0 / (end - start)));
        return 0;
}


/*
 *  Mutexes
 */

struct B2_mutex {
        mutex_t m;
};

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

void B2_lock_mutex(B2_mutex *mutex)
{
        mutex->m.lock();
}

void B2_unlock_mutex(B2_mutex *mutex)
{
        mutex->m.unlock();
}

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


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

volatile uint32 InterruptFlags = 0;
static mutex_t intflags_mutex;

void SetInterruptFlag(uint32 flag)
{
        intflags_mutex.lock();
        InterruptFlags |= flag;
        intflags_mutex.unlock();
}

void ClearInterruptFlag(uint32 flag)
{
        intflags_mutex.lock();
        InterruptFlags &= ~flag;
        intflags_mutex.unlock();
}


/*
 *  Disable interrupts
 */

void DisableInterrupt(void)
{
        WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) + 1);
}


/*
 *  Enable interrupts
 */

void EnableInterrupt(void)
{
        WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) - 1);
}


/*
 *  Helpers to share 32-bit addressable data with MacOS
 */

bool SheepMem::Init(void)
{
        // Size of a native page
        page_size = vm_get_page_size();

        // Allocate SheepShaver globals
        proc = base;
        if (vm_mac_acquire(base, size) < 0)
                return false;

        // Allocate page with all bits set to 0, right in the middle
        // This is also used to catch undesired overlaps between proc and data areas
        zero_page = proc + (size / 2);
        Mac_memset(zero_page, 0, page_size);
        if (vm_protect(Mac2HostAddr(zero_page), page_size, VM_PAGE_READ) < 0)
                return false;

        // Allocate alternate stack for PowerPC interrupt routine
        sig_stack = base + size;
        if (vm_mac_acquire(sig_stack, SIG_STACK_SIZE) < 0)
                return false;

        data = base + size;
        return true;
}

void SheepMem::Exit(void)
{
        if (data) {
                // Delete SheepShaver globals
                vm_mac_release(base, size);

                // Delete alternate stack for PowerPC interrupt routine
                vm_mac_release(sig_stack, SIG_STACK_SIZE);
        }
}


/*
 *  Get the main window handle
 */

#ifdef USE_SDL_VIDEO
#include <SDL_syswm.h>
static HWND GetMainWindowHandle(void)
{
        SDL_SysWMinfo wmInfo;
        wmInfo.version.major = SDL_MAJOR_VERSION;
        wmInfo.version.minor = SDL_MINOR_VERSION;
        wmInfo.version.patch = SDL_PATCHLEVEL;
        return SDL_GetWMInfo(&wmInfo) ? wmInfo.window : NULL;
}
#endif


/*
 *  Display alert
 */

static void display_alert(int title_id, const char *text, int flags)
{
        HWND hMainWnd = GetMainWindowHandle();
        MessageBox(hMainWnd, text, GetString(title_id), MB_OK | flags);
}


/*
 *  Display error alert
 */

void ErrorAlert(const char *text)
{
        if (PrefsFindBool("nogui"))
                return;

        VideoQuitFullScreen();
        display_alert(STR_ERROR_ALERT_TITLE, text, MB_ICONSTOP);
}


/*
 *  Display warning alert
 */

void WarningAlert(const char *text)
{
        if (PrefsFindBool("nogui"))
                return;

        display_alert(STR_WARNING_ALERT_TITLE, text, MB_ICONINFORMATION);
}


/*
 *  Display choice alert
 */

bool ChoiceAlert(const char *text, const char *pos, const char *neg)
{
        printf(GetString(STR_SHELL_WARNING_PREFIX), text);
        return false;   //!!
}
Revision:	1.7
Committed:	2005-01-30T21:48:20Z (19 years, 10 months ago) by gbeauche
Branch:	MAIN
Changes since 1.6:	+1 -1 lines
Log Message:	Happy New Year 2005!
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* main_windows.cpp - Emulation core, Windows implementation
3			*
4	gbeauche	1.7	* SheepShaver (C) 1997-2005 Christian Bauer and Marc Hellwig
5	gbeauche	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 <errno.h>
22			#include <stdio.h>
23			#include <stdlib.h>
24			#include <string.h>
25
26			#include <SDL.h>
27
28			#include "sysdeps.h"
29			#include "main.h"
30			#include "version.h"
31			#include "prefs.h"
32			#include "prefs_editor.h"
33			#include "cpu_emulation.h"
34			#include "emul_op.h"
35			#include "xlowmem.h"
36			#include "xpram.h"
37			#include "timer.h"
38			#include "adb.h"
39			#include "video.h"
40			#include "sys.h"
41			#include "macos_util.h"
42			#include "rom_patches.h"
43			#include "user_strings.h"
44			#include "vm_alloc.h"
45			#include "sigsegv.h"
46	gbeauche	1.3	#include "util_windows.h"
47	gbeauche	1.1
48			#define DEBUG 0
49			#include "debug.h"
50
51			#ifdef ENABLE_MON
52			#include "mon.h"
53			#endif
54
55
56			// Constants
57			const char ROM_FILE_NAME[] = "ROM";
58			const char ROM_FILE_NAME2[] = "Mac OS ROM";
59
60			const uintptr RAM_BASE = 0x10000000; // Base address of RAM
61			const uint32 SIG_STACK_SIZE = 0x10000; // Size of signal stack
62
63
64			// Global variables (exported)
65			uint32 RAMBase; // Base address of Mac RAM
66			uint32 RAMSize; // Size of Mac RAM
67			uint32 KernelDataAddr; // Address of Kernel Data
68			uint32 BootGlobsAddr; // Address of BootGlobs structure at top of Mac RAM
69			uint32 DRCacheAddr; // Address of DR Cache
70			uint32 PVR; // Theoretical PVR
71			int64 CPUClockSpeed; // Processor clock speed (Hz)
72			int64 BusClockSpeed; // Bus clock speed (Hz)
73			int64 TimebaseSpeed; // Timebase clock speed (Hz)
74			uint8 *RAMBaseHost; // Base address of Mac RAM (host address space)
75			uint8 *ROMBaseHost; // Base address of Mac ROM (host address space)
76
77
78			// Global variables
79			static bool lm_area_mapped = false; // Flag: Low Memory area mmap()ped
80			static int kernel_area = -1; // SHM ID of Kernel Data area
81			static bool rom_area_mapped = false; // Flag: Mac ROM mmap()ped
82			static bool ram_area_mapped = false; // Flag: Mac RAM mmap()ped
83			static bool dr_cache_area_mapped = false; // Flag: Mac DR Cache mmap()ped
84			static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
85			static KernelData *kernel_data; // Pointer to Kernel Data
86			static EmulatorData *emulator_data;
87
88			static uint8 last_xpram[XPRAM_SIZE]; // Buffer for monitoring XPRAM changes
89			static bool nvram_thread_active = false; // Flag: NVRAM watchdog installed
90			static volatile bool nvram_thread_cancel; // Flag: Cancel NVRAM thread
91	gbeauche	1.3	static HANDLE nvram_thread = NULL; // NVRAM watchdog
92	gbeauche	1.1	static bool tick_thread_active = false; // Flag: MacOS thread installed
93			static volatile bool tick_thread_cancel; // Flag: Cancel 60Hz thread
94	gbeauche	1.3	static HANDLE tick_thread = NULL; // 60Hz thread
95			static HANDLE emul_thread = NULL; // MacOS thread
96	gbeauche	1.1	static uintptr sig_stack = 0; // Stack for PowerPC interrupt routine
97
98			uint32 SheepMem::page_size; // Size of a native page
99			uintptr SheepMem::zero_page = 0; // Address of ro page filled in with zeros
100			uintptr SheepMem::base = 0x60000000; // Address of SheepShaver data
101			uintptr SheepMem::proc; // Bottom address of SheepShave procedures
102			uintptr SheepMem::data; // Top of SheepShaver data (stack like storage)
103
104
105			// Prototypes
106			static bool kernel_data_init(void);
107			static void kernel_data_exit(void);
108			static void Quit(void);
109	gbeauche	1.3	static DWORD WINAPI nvram_func(void *arg);
110			static DWORD WINAPI tick_func(void *arg);
111	gbeauche	1.1
112			static void jump_to_rom(uint32 entry);
113			extern void emul_ppc(uint32 start);
114			extern void init_emul_ppc(void);
115			extern void exit_emul_ppc(void);
116			sigsegv_return_t sigsegv_handler(sigsegv_address_t, sigsegv_address_t);
117
118
119			/*
120			* Return signal stack base
121			*/
122
123			uintptr SignalStackBase(void)
124			{
125			return sig_stack + SIG_STACK_SIZE;
126			}
127
128
129			/*
130			* Memory management helpers
131			*/
132
133			static inline int vm_mac_acquire(uint32 addr, uint32 size)
134			{
135			return vm_acquire_fixed(Mac2HostAddr(addr), size);
136			}
137
138			static inline int vm_mac_release(uint32 addr, uint32 size)
139			{
140			return vm_release(Mac2HostAddr(addr), size);
141			}
142
143
144			/*
145			* Main program
146			*/
147
148			static void usage(const char *prg_name)
149			{
150			printf("Usage: %s [OPTION...]\n", prg_name);
151			printf("\nUnix options:\n");
152			printf(" --display STRING\n X display to use\n");
153			PrefsPrintUsage();
154			exit(0);
155			}
156
157			int main(int argc, char **argv)
158			{
159			char str[256];
160			int16 i16;
161			HANDLE rom_fh;
162			const char *rom_path;
163			uint32 rom_size;
164			DWORD actual;
165			uint8 *rom_tmp;
166
167			// Initialize variables
168			RAMBase = 0;
169			tzset();
170
171			// Print some info
172			printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
173			printf(" %s\n", GetString(STR_ABOUT_TEXT2));
174
175			// Read preferences
176			PrefsInit(argc, argv);
177
178			// Parse command line arguments
179			for (int i=1; i<argc; i++) {
180			if (strcmp(argv[i], "--help") == 0) {
181			usage(argv[0]);
182			} else if (argv[i][0] == '-') {
183			fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
184			usage(argv[0]);
185			}
186			}
187
188			// Initialize SDL system
189			int sdl_flags = 0;
190			#ifdef USE_SDL_VIDEO
191			sdl_flags \|= SDL_INIT_VIDEO;
192			#endif
193			#ifdef USE_SDL_AUDIO
194			sdl_flags \|= SDL_INIT_AUDIO;
195			#endif
196			assert(sdl_flags != 0);
197			if (SDL_Init(sdl_flags) == -1) {
198			char str[256];
199			sprintf(str, "Could not initialize SDL: %s.\n", SDL_GetError());
200			ErrorAlert(str);
201			goto quit;
202			}
203			atexit(SDL_Quit);
204
205			#ifdef ENABLE_MON
206			// Initialize mon
207			mon_init();
208			#endif
209
210			// Install SIGSEGV handler for CPU emulator
211			if (!sigsegv_install_handler(sigsegv_handler)) {
212			sprintf(str, GetString(STR_SIGSEGV_INSTALL_ERR), strerror(errno));
213			ErrorAlert(str);
214			goto quit;
215			}
216
217			// Initialize VM system
218			vm_init();
219
220			// Get system info
221			PVR = 0x00040000; // Default: 604
222			CPUClockSpeed = 100000000; // Default: 100MHz
223			BusClockSpeed = 100000000; // Default: 100MHz
224			TimebaseSpeed = 25000000; // Default: 25MHz
225			PVR = 0x000c0000; // Default: 7400 (with AltiVec)
226			D(bug("PVR: %08x (assumed)\n", PVR));
227
228			// Init system routines
229			SysInit();
230
231			// Show preferences editor
232			if (!PrefsFindBool("nogui"))
233			if (!PrefsEditor())
234			goto quit;
235
236			// Create Low Memory area (0x0000..0x3000)
237			if (vm_mac_acquire(0, 0x3000) < 0) {
238			sprintf(str, GetString(STR_LOW_MEM_MMAP_ERR), strerror(errno));
239			ErrorAlert(str);
240			goto quit;
241			}
242			lm_area_mapped = true;
243
244			// Create areas for Kernel Data
245			if (!kernel_data_init())
246			goto quit;
247			kernel_data = (KernelData *)Mac2HostAddr(KERNEL_DATA_BASE);
248			emulator_data = &kernel_data->ed;
249			KernelDataAddr = KERNEL_DATA_BASE;
250			D(bug("Kernel Data at %p (%08x)\n", kernel_data, KERNEL_DATA_BASE));
251			D(bug("Emulator Data at %p (%08x)\n", emulator_data, KERNEL_DATA_BASE + offsetof(KernelData, ed)));
252
253			// Create area for DR Cache
254			if (vm_mac_acquire(DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
255			sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
256			ErrorAlert(str);
257			goto quit;
258			}
259			dr_emulator_area_mapped = true;
260			if (vm_mac_acquire(DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
261			sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
262			ErrorAlert(str);
263			goto quit;
264			}
265			dr_cache_area_mapped = true;
266			DRCacheAddr = (uint32)Mac2HostAddr(DR_CACHE_BASE);
267			D(bug("DR Cache at %p (%08x)\n", DRCacheAddr, DR_CACHE_BASE));
268
269			// Create area for SheepShaver data
270			if (!SheepMem::Init()) {
271			sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
272			ErrorAlert(str);
273			goto quit;
274			}
275
276			// Create area for Mac ROM
277			if (vm_mac_acquire(ROM_BASE, ROM_AREA_SIZE) < 0) {
278			sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
279			ErrorAlert(str);
280			goto quit;
281			}
282			ROMBaseHost = Mac2HostAddr(ROM_BASE);
283			rom_area_mapped = true;
284			D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROM_BASE));
285
286			// Create area for Mac RAM
287			RAMSize = PrefsFindInt32("ramsize");
288			if (RAMSize < 810241024) {
289			WarningAlert(GetString(STR_SMALL_RAM_WARN));
290			RAMSize = 810241024;
291			}
292
293			if (vm_mac_acquire(RAM_BASE, RAMSize) < 0) {
294			sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
295			ErrorAlert(str);
296			goto quit;
297			}
298			RAMBaseHost = Mac2HostAddr(RAM_BASE);
299			RAMBase = RAM_BASE;
300			ram_area_mapped = true;
301			D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));
302
303			if (RAMBase > ROM_BASE) {
304			ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
305			goto quit;
306			}
307
308			// Load Mac ROM
309			rom_path = PrefsFindString("rom");
310			rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME,
311			GENERIC_READ, 0, NULL, OPEN_EXISTING,
312			FILE_ATTRIBUTE_NORMAL, NULL);
313
314			if (rom_fh == INVALID_HANDLE_VALUE) {
315			rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME2,
316			GENERIC_READ, 0, NULL, OPEN_EXISTING,
317			FILE_ATTRIBUTE_NORMAL, NULL);
318
319			if (rom_fh == INVALID_HANDLE_VALUE) {
320			ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
321			goto quit;
322			}
323			}
324			printf(GetString(STR_READING_ROM_FILE));
325			rom_size = GetFileSize(rom_fh, NULL);
326			rom_tmp = new uint8[ROM_SIZE];
327			ReadFile(rom_fh, (void *)rom_tmp, ROM_SIZE, &actual, NULL);
328			CloseHandle(rom_fh);
329
330			// Decode Mac ROM
331			if (!DecodeROM(rom_tmp, actual)) {
332			if (rom_size != 410241024) {
333			ErrorAlert(GetString(STR_ROM_SIZE_ERR));
334			goto quit;
335			} else {
336			ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
337			goto quit;
338			}
339			}
340			delete[] rom_tmp;
341
342	gbeauche	1.6	// Initialize everything
343			if (!InitAll())
344	gbeauche	1.1	goto quit;
345	gbeauche	1.6	D(bug("Initialization complete\n"));
346	gbeauche	1.1
347			// Write protect ROM
348	gbeauche	1.6	vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ);
349	gbeauche	1.1
350			// Start 60Hz thread
351			tick_thread_cancel = false;
352	gbeauche	1.3	tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
353			SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
354	gbeauche	1.1	D(bug("Tick thread installed (%ld)\n", tick_thread));
355
356			// Start NVRAM watchdog thread
357			memcpy(last_xpram, XPRAM, XPRAM_SIZE);
358			nvram_thread_cancel = false;
359	gbeauche	1.3	nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
360			SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
361	gbeauche	1.1	D(bug("NVRAM thread installed (%ld)\n", nvram_thread));
362
363	gbeauche	1.3	// Get my thread ID and jump to ROM boot routine
364			emul_thread = GetCurrentThread();
365	gbeauche	1.1	D(bug("Jumping to ROM\n"));
366			jump_to_rom(ROM_BASE + 0x310000);
367			D(bug("Returned from ROM\n"));
368
369			quit:
370			Quit();
371			return 0;
372			}
373
374
375			/*
376			* Cleanup and quit
377			*/
378
379			static void Quit(void)
380			{
381			// Exit PowerPC emulation
382			exit_emul_ppc();
383
384			// Stop 60Hz thread
385			if (tick_thread_active) {
386			tick_thread_cancel = true;
387	gbeauche	1.3	wait_thread(tick_thread);
388	gbeauche	1.1	}
389
390			// Stop NVRAM watchdog thread
391			if (nvram_thread_active) {
392			nvram_thread_cancel = true;
393	gbeauche	1.3	wait_thread(nvram_thread);
394	gbeauche	1.1	}
395
396	gbeauche	1.6	// Deinitialize everything
397			ExitAll();
398	gbeauche	1.1
399			// Delete SheepShaver globals
400			SheepMem::Exit();
401
402			// Delete RAM area
403			if (ram_area_mapped)
404			vm_mac_release(RAM_BASE, RAMSize);
405
406			// Delete ROM area
407			if (rom_area_mapped)
408			vm_mac_release(ROM_BASE, ROM_AREA_SIZE);
409
410			// Delete DR cache areas
411			if (dr_emulator_area_mapped)
412			vm_mac_release(DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
413			if (dr_cache_area_mapped)
414			vm_mac_release(DR_CACHE_BASE, DR_CACHE_SIZE);
415
416			// Delete Kernel Data area
417			kernel_data_exit();
418
419			// Delete Low Memory area
420			if (lm_area_mapped)
421			vm_mac_release(0, 0x3000);
422
423			// Exit system routines
424			SysExit();
425
426			// Exit preferences
427			PrefsExit();
428
429			#ifdef ENABLE_MON
430			// Exit mon
431			mon_exit();
432			#endif
433
434			exit(0);
435			}
436
437
438			/*
439			* Initialize Kernel Data segments
440			*/
441
442			static HANDLE kernel_handle; // Shared memory handle for Kernel Data
443			static DWORD allocation_granule; // Minimum size of allocateable are (64K)
444			static DWORD kernel_area_size; // Size of Kernel Data area
445
446			static bool kernel_data_init(void)
447			{
448			char str[256];
449			SYSTEM_INFO si;
450			GetSystemInfo(&si);
451			allocation_granule = si.dwAllocationGranularity;
452			kernel_area_size = (KERNEL_AREA_SIZE + allocation_granule - 1) & -allocation_granule;
453
454			char rcs[10];
455			LPVOID kernel_addr;
456			kernel_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, kernel_area_size, NULL);
457			if (kernel_handle == NULL) {
458			sprintf(rcs, "%d", GetLastError());
459			sprintf(str, GetString(STR_KD_SHMGET_ERR), rcs);
460			ErrorAlert(str);
461			return false;
462			}
463			kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule);
464			if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
465			sprintf(rcs, "%d", GetLastError());
466			sprintf(str, GetString(STR_KD_SHMAT_ERR), rcs);
467			ErrorAlert(str);
468			return false;
469			}
470			kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule);
471			if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
472			sprintf(rcs, "%d", GetLastError());
473			sprintf(str, GetString(STR_KD2_SHMAT_ERR), rcs);
474			ErrorAlert(str);
475			return false;
476			}
477			return true;
478			}
479
480
481			/*
482			* Deallocate Kernel Data segments
483			*/
484
485			static void kernel_data_exit(void)
486			{
487			if (kernel_handle) {
488			UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule));
489			UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule));
490			CloseHandle(kernel_handle);
491			}
492			}
493
494
495			/*
496			* Jump into Mac ROM, start 680x0 emulator
497			*/
498
499			void jump_to_rom(uint32 entry)
500			{
501			init_emul_ppc();
502			emul_ppc(entry);
503			}
504
505
506			/*
507			* Quit emulator (cause return from jump_to_rom)
508			*/
509
510			void QuitEmulator(void)
511			{
512			Quit();
513			}
514
515
516			/*
517			* Pause/resume emulator
518			*/
519
520			void PauseEmulator(void)
521			{
522	gbeauche	1.3	SuspendThread(emul_thread);
523	gbeauche	1.1	}
524
525			void ResumeEmulator(void)
526			{
527	gbeauche	1.3	ResumeThread(emul_thread);
528	gbeauche	1.1	}
529
530
531			/*
532			* Dump 68k registers
533			*/
534
535			void Dump68kRegs(M68kRegisters *r)
536			{
537			// Display 68k registers
538			for (int i=0; i<8; i++) {
539			printf("d%d: %08x", i, r->d[i]);
540			if (i == 3 \|\| i == 7)
541			printf("\n");
542			else
543			printf(", ");
544			}
545			for (int i=0; i<8; i++) {
546			printf("a%d: %08x", i, r->a[i]);
547			if (i == 3 \|\| i == 7)
548			printf("\n");
549			else
550			printf(", ");
551			}
552			}
553
554
555			/*
556			* Make code executable
557			*/
558
559			void MakeExecutable(int dummy, uint32 start, uint32 length)
560			{
561			if ((start >= ROM_BASE) && (start < (ROM_BASE + ROM_SIZE)))
562			return;
563			FlushCodeCache(start, start + length);
564			}
565
566
567			/*
568			* NVRAM watchdog thread (saves NVRAM every minute)
569			*/
570
571			static void nvram_watchdog(void)
572			{
573			if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
574			memcpy(last_xpram, XPRAM, XPRAM_SIZE);
575			SaveXPRAM();
576			}
577			}
578
579	gbeauche	1.3	static DWORD nvram_func(void *arg)
580	gbeauche	1.1	{
581			while (!nvram_thread_cancel) {
582			for (int i=0; i<60 && !nvram_thread_cancel; i++)
583			Delay_usec(999999); // Only wait 1 second so we quit promptly when nvram_thread_cancel becomes true
584			nvram_watchdog();
585			}
586			return 0;
587			}
588
589
590			/*
591			* 60Hz thread (really 60.15Hz)
592			*/
593
594	gbeauche	1.3	static DWORD tick_func(void *arg)
595	gbeauche	1.1	{
596			int tick_counter = 0;
597			uint64 start = GetTicks_usec();
598			int64 ticks = 0;
599			uint64 next = GetTicks_usec();
600
601			while (!tick_thread_cancel) {
602
603			// Wait
604			next += 16625;
605			int64 delay = next - GetTicks_usec();
606			if (delay > 0)
607			Delay_usec(delay);
608			else if (delay < -16625)
609			next = GetTicks_usec();
610			ticks++;
611
612			// Pseudo Mac 1Hz interrupt, update local time
613			if (++tick_counter > 60) {
614			tick_counter = 0;
615			WriteMacInt32(0x20c, TimerDateTime());
616			}
617
618			// Trigger 60Hz interrupt
619			if (ReadMacInt32(XLM_IRQ_NEST) == 0) {
620			SetInterruptFlag(INTFLAG_VIA);
621			TriggerInterrupt();
622			}
623			}
624
625			uint64 end = GetTicks_usec();
626			D(bug("%Ld ticks in %Ld usec = %f ticks/sec\n", ticks, end - start, ticks * 1000000.0 / (end - start)));
627			return 0;
628			}
629
630
631			/*
632			* Mutexes
633			*/
634
635			struct B2_mutex {
636	gbeauche	1.4	mutex_t m;
637	gbeauche	1.1	};
638
639			B2_mutex *B2_create_mutex(void)
640			{
641			return new B2_mutex;
642			}
643
644			void B2_lock_mutex(B2_mutex *mutex)
645			{
646	gbeauche	1.4	mutex->m.lock();
647	gbeauche	1.1	}
648
649			void B2_unlock_mutex(B2_mutex *mutex)
650			{
651	gbeauche	1.4	mutex->m.unlock();
652	gbeauche	1.1	}
653
654			void B2_delete_mutex(B2_mutex *mutex)
655			{
656			delete mutex;
657			}
658
659
660			/*
661			* Interrupt flags (must be handled atomically!)
662			*/
663
664			volatile uint32 InterruptFlags = 0;
665	gbeauche	1.4	static mutex_t intflags_mutex;
666	gbeauche	1.1
667			void SetInterruptFlag(uint32 flag)
668			{
669	gbeauche	1.4	intflags_mutex.lock();
670			InterruptFlags \|= flag;
671			intflags_mutex.unlock();
672	gbeauche	1.1	}
673
674			void ClearInterruptFlag(uint32 flag)
675			{
676	gbeauche	1.4	intflags_mutex.lock();
677			InterruptFlags &= ~flag;
678			intflags_mutex.unlock();
679	gbeauche	1.1	}
680
681
682			/*
683			* Disable interrupts
684			*/
685
686			void DisableInterrupt(void)
687			{
688			WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) + 1);
689			}
690
691
692			/*
693			* Enable interrupts
694			*/
695
696			void EnableInterrupt(void)
697			{
698			WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) - 1);
699			}
700
701
702			/*
703			* Helpers to share 32-bit addressable data with MacOS
704			*/
705
706			bool SheepMem::Init(void)
707			{
708			// Size of a native page
709	gbeauche	1.5	page_size = vm_get_page_size();
710	gbeauche	1.1
711			// Allocate SheepShaver globals
712			proc = base;
713			if (vm_mac_acquire(base, size) < 0)
714			return false;
715
716			// Allocate page with all bits set to 0, right in the middle
717			// This is also used to catch undesired overlaps between proc and data areas
718			zero_page = proc + (size / 2);
719			Mac_memset(zero_page, 0, page_size);
720			if (vm_protect(Mac2HostAddr(zero_page), page_size, VM_PAGE_READ) < 0)
721			return false;
722
723			// Allocate alternate stack for PowerPC interrupt routine
724			sig_stack = base + size;
725			if (vm_mac_acquire(sig_stack, SIG_STACK_SIZE) < 0)
726			return false;
727
728			data = base + size;
729			return true;
730			}
731
732			void SheepMem::Exit(void)
733			{
734			if (data) {
735			// Delete SheepShaver globals
736			vm_mac_release(base, size);
737
738			// Delete alternate stack for PowerPC interrupt routine
739			vm_mac_release(sig_stack, SIG_STACK_SIZE);
740			}
741			}
742
743
744			/*
745			* Get the main window handle
746			*/
747
748			#ifdef USE_SDL_VIDEO
749			#include <SDL_syswm.h>
750			static HWND GetMainWindowHandle(void)
751			{
752			SDL_SysWMinfo wmInfo;
753			wmInfo.version.major = SDL_MAJOR_VERSION;
754			wmInfo.version.minor = SDL_MINOR_VERSION;
755			wmInfo.version.patch = SDL_PATCHLEVEL;
756			return SDL_GetWMInfo(&wmInfo) ? wmInfo.window : NULL;
757			}
758			#endif
759
760
761			/*
762			* Display alert
763			*/
764
765			static void display_alert(int title_id, const char *text, int flags)
766			{
767			HWND hMainWnd = GetMainWindowHandle();
768			MessageBox(hMainWnd, text, GetString(title_id), MB_OK \| flags);
769			}
770
771
772			/*
773			* Display error alert
774			*/
775
776			void ErrorAlert(const char *text)
777			{
778			if (PrefsFindBool("nogui"))
779			return;
780
781			VideoQuitFullScreen();
782			display_alert(STR_ERROR_ALERT_TITLE, text, MB_ICONSTOP);
783			}
784
785
786			/*
787			* Display warning alert
788			*/
789
790			void WarningAlert(const char *text)
791			{
792			if (PrefsFindBool("nogui"))
793			return;
794
795			display_alert(STR_WARNING_ALERT_TITLE, text, MB_ICONINFORMATION);
796			}
797
798
799			/*
800			* Display choice alert
801			*/
802
803			bool ChoiceAlert(const char text, const char pos, const char *neg)
804			{
805			printf(GetString(STR_SHELL_WARNING_PREFIX), text);
806			return false; //!!
807			}