src/Windows/main_windows.cpp

/*
 *  main_windows.cpp - Emulation core, Windows implementation
 *
 *  SheepShaver (C) 1997-2008 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"
#include "kernel_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 ROM_BASE = 0x40800000;            // Base address of ROM

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 ROMBase;                 // Base address of Mac ROM
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)
DWORD win_os;                   // Windows OS id
DWORD win_os_major;             // Windows OS version major


// Global variables
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_info_t *sip);


/*
 *  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;

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

        // Read preferences
        PrefsInit(NULL, 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]);
                }
        }

        // Check we are using a Windows NT kernel >= 4.0
        OSVERSIONINFO osvi;
        ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
        osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
        if (!GetVersionEx(&osvi)) {
                ErrorAlert("Could not determine OS type");
                QuitEmulator();
        }
        win_os = osvi.dwPlatformId;
        win_os_major = osvi.dwMajorVersion;
        if (win_os != VER_PLATFORM_WIN32_NT || win_os_major < 4) {
                ErrorAlert(GetString(STR_NO_WIN32_NT_4));
                QuitEmulator();
        }

        // Check that drivers are installed
        if (!check_drivers())
                QuitEmulator();

        // Load win32 libraries
        KernelInit();

        // FIXME: default to DIB driver
        if (getenv("SDL_VIDEODRIVER") == NULL)
            putenv("SDL_VIDEODRIVER=windib");

        // 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 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;
        }
        ROMBase = ROM_BASE;
        ROMBaseHost = Mac2HostAddr(ROMBase);
        rom_area_mapped = true;
        D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROMBase));

        // Create area for Mac RAM
        RAMSize = PrefsFindInt32("ramsize");
        if (RAMSize < 8*1024*1024) {
                WarningAlert(GetString(STR_SMALL_RAM_WARN));
                RAMSize = 8*1024*1024;
        }
        RAMBase = 0;
        if (vm_mac_acquire(RAMBase, RAMSize) < 0) {
                sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
                ErrorAlert(str);
                goto quit;
        }
        RAMBaseHost = Mac2HostAddr(RAMBase);
        ram_area_mapped = true;
        D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));

        if (RAMBase > ROMBase) {
                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_path : ROM_FILE_NAME,
                                                GENERIC_READ, 0, NULL, OPEN_EXISTING,
                                                FILE_ATTRIBUTE_NORMAL, NULL);

        if (rom_fh == INVALID_HANDLE_VALUE) {
                rom_fh = CreateFile(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 native timers
        timer_init();

        // Initialize everything
        if (!InitAll(NULL))
                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(ROMBase + 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(RAMBase, RAMSize);

        // Delete ROM area
        if (rom_area_mapped)
                vm_mac_release(ROMBase, 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();

        // Exit system routines
        SysExit();

        // Exit preferences
        PrefsExit();

        // Release win32 libraries
        KernelExit();

#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 >= ROMBase) && (start < (ROMBase + 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("%lu ticks in %lu usec = %f ticks/sec\n", (unsigned long)ticks, (unsigned long)(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>
HWND GetMainWindowHandle(void)
{
        SDL_SysWMinfo wmInfo;
        SDL_VERSION(&wmInfo.version);
        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:	1.19
Committed:	2009-09-21T03:34:14Z (15 years, 1 month ago) by asvitkine
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.18:	+1 -1 lines
Error occurred while calculating annotation data.
Log Message:	Fix builds on platforms that may have gotten broken due to my vmdir changes.
#	Content
1	/*
2	* main_windows.cpp - Emulation core, Windows implementation
3	*
4	* SheepShaver (C) 1997-2008 Christian Bauer and Marc Hellwig
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 <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	#include "util_windows.h"
47	#include "kernel_windows.h"
48
49	#define DEBUG 0
50	#include "debug.h"
51
52	#ifdef ENABLE_MON
53	#include "mon.h"
54	#endif
55
56
57	// Constants
58	const char ROM_FILE_NAME[] = "ROM";
59	const char ROM_FILE_NAME2[] = "Mac OS ROM";
60
61	const uintptr ROM_BASE = 0x40800000; // Base address of ROM
62
63	const uint32 SIG_STACK_SIZE = 0x10000; // Size of signal stack
64
65
66	// Global variables (exported)
67	uint32 RAMBase; // Base address of Mac RAM
68	uint32 RAMSize; // Size of Mac RAM
69	uint32 ROMBase; // Base address of Mac ROM
70	uint32 KernelDataAddr; // Address of Kernel Data
71	uint32 BootGlobsAddr; // Address of BootGlobs structure at top of Mac RAM
72	uint32 DRCacheAddr; // Address of DR Cache
73	uint32 PVR; // Theoretical PVR
74	int64 CPUClockSpeed; // Processor clock speed (Hz)
75	int64 BusClockSpeed; // Bus clock speed (Hz)
76	int64 TimebaseSpeed; // Timebase clock speed (Hz)
77	uint8 *RAMBaseHost; // Base address of Mac RAM (host address space)
78	uint8 *ROMBaseHost; // Base address of Mac ROM (host address space)
79	DWORD win_os; // Windows OS id
80	DWORD win_os_major; // Windows OS version major
81
82
83	// Global variables
84	static int kernel_area = -1; // SHM ID of Kernel Data area
85	static bool rom_area_mapped = false; // Flag: Mac ROM mmap()ped
86	static bool ram_area_mapped = false; // Flag: Mac RAM mmap()ped
87	static bool dr_cache_area_mapped = false; // Flag: Mac DR Cache mmap()ped
88	static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
89	static KernelData *kernel_data; // Pointer to Kernel Data
90	static EmulatorData *emulator_data;
91
92	static uint8 last_xpram[XPRAM_SIZE]; // Buffer for monitoring XPRAM changes
93	static bool nvram_thread_active = false; // Flag: NVRAM watchdog installed
94	static volatile bool nvram_thread_cancel; // Flag: Cancel NVRAM thread
95	static HANDLE nvram_thread = NULL; // NVRAM watchdog
96	static bool tick_thread_active = false; // Flag: MacOS thread installed
97	static volatile bool tick_thread_cancel; // Flag: Cancel 60Hz thread
98	static HANDLE tick_thread = NULL; // 60Hz thread
99	static HANDLE emul_thread = NULL; // MacOS thread
100	static uintptr sig_stack = 0; // Stack for PowerPC interrupt routine
101
102	uint32 SheepMem::page_size; // Size of a native page
103	uintptr SheepMem::zero_page = 0; // Address of ro page filled in with zeros
104	uintptr SheepMem::base = 0x60000000; // Address of SheepShaver data
105	uintptr SheepMem::proc; // Bottom address of SheepShave procedures
106	uintptr SheepMem::data; // Top of SheepShaver data (stack like storage)
107
108
109	// Prototypes
110	static bool kernel_data_init(void);
111	static void kernel_data_exit(void);
112	static void Quit(void);
113	static DWORD WINAPI nvram_func(void *arg);
114	static DWORD WINAPI tick_func(void *arg);
115
116	static void jump_to_rom(uint32 entry);
117	extern void emul_ppc(uint32 start);
118	extern void init_emul_ppc(void);
119	extern void exit_emul_ppc(void);
120	sigsegv_return_t sigsegv_handler(sigsegv_info_t *sip);
121
122
123	/*
124	* Return signal stack base
125	*/
126
127	uintptr SignalStackBase(void)
128	{
129	return sig_stack + SIG_STACK_SIZE;
130	}
131
132
133	/*
134	* Memory management helpers
135	*/
136
137	static inline int vm_mac_acquire(uint32 addr, uint32 size)
138	{
139	return vm_acquire_fixed(Mac2HostAddr(addr), size);
140	}
141
142	static inline int vm_mac_release(uint32 addr, uint32 size)
143	{
144	return vm_release(Mac2HostAddr(addr), size);
145	}
146
147
148	/*
149	* Main program
150	*/
151
152	static void usage(const char *prg_name)
153	{
154	printf("Usage: %s [OPTION...]\n", prg_name);
155	printf("\nUnix options:\n");
156	printf(" --display STRING\n X display to use\n");
157	PrefsPrintUsage();
158	exit(0);
159	}
160
161	int main(int argc, char **argv)
162	{
163	char str[256];
164	int16 i16;
165	HANDLE rom_fh;
166	const char *rom_path;
167	uint32 rom_size;
168	DWORD actual;
169	uint8 *rom_tmp;
170
171	// Initialize variables
172	RAMBase = 0;
173
174	// Print some info
175	printf(GetString(STR_ABOUT_TEXT1), VERSION_MAJOR, VERSION_MINOR);
176	printf(" %s\n", GetString(STR_ABOUT_TEXT2));
177
178	// Read preferences
179	PrefsInit(NULL, argc, argv);
180
181	// Parse command line arguments
182	for (int i=1; i<argc; i++) {
183	if (strcmp(argv[i], "--help") == 0) {
184	usage(argv[0]);
185	} else if (argv[i][0] == '-') {
186	fprintf(stderr, "Unrecognized option '%s'\n", argv[i]);
187	usage(argv[0]);
188	}
189	}
190
191	// Check we are using a Windows NT kernel >= 4.0
192	OSVERSIONINFO osvi;
193	ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
194	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
195	if (!GetVersionEx(&osvi)) {
196	ErrorAlert("Could not determine OS type");
197	QuitEmulator();
198	}
199	win_os = osvi.dwPlatformId;
200	win_os_major = osvi.dwMajorVersion;
201	if (win_os != VER_PLATFORM_WIN32_NT \|\| win_os_major < 4) {
202	ErrorAlert(GetString(STR_NO_WIN32_NT_4));
203	QuitEmulator();
204	}
205
206	// Check that drivers are installed
207	if (!check_drivers())
208	QuitEmulator();
209
210	// Load win32 libraries
211	KernelInit();
212
213	// FIXME: default to DIB driver
214	if (getenv("SDL_VIDEODRIVER") == NULL)
215	putenv("SDL_VIDEODRIVER=windib");
216
217	// Initialize SDL system
218	int sdl_flags = 0;
219	#ifdef USE_SDL_VIDEO
220	sdl_flags \|= SDL_INIT_VIDEO;
221	#endif
222	#ifdef USE_SDL_AUDIO
223	sdl_flags \|= SDL_INIT_AUDIO;
224	#endif
225	assert(sdl_flags != 0);
226	if (SDL_Init(sdl_flags) == -1) {
227	char str[256];
228	sprintf(str, "Could not initialize SDL: %s.\n", SDL_GetError());
229	ErrorAlert(str);
230	goto quit;
231	}
232	atexit(SDL_Quit);
233
234	#ifdef ENABLE_MON
235	// Initialize mon
236	mon_init();
237	#endif
238
239	// Install SIGSEGV handler for CPU emulator
240	if (!sigsegv_install_handler(sigsegv_handler)) {
241	sprintf(str, GetString(STR_SIGSEGV_INSTALL_ERR), strerror(errno));
242	ErrorAlert(str);
243	goto quit;
244	}
245
246	// Initialize VM system
247	vm_init();
248
249	// Get system info
250	PVR = 0x00040000; // Default: 604
251	CPUClockSpeed = 100000000; // Default: 100MHz
252	BusClockSpeed = 100000000; // Default: 100MHz
253	TimebaseSpeed = 25000000; // Default: 25MHz
254	PVR = 0x000c0000; // Default: 7400 (with AltiVec)
255	D(bug("PVR: %08x (assumed)\n", PVR));
256
257	// Init system routines
258	SysInit();
259
260	// Show preferences editor
261	if (!PrefsFindBool("nogui"))
262	if (!PrefsEditor())
263	goto quit;
264
265	// Create areas for Kernel Data
266	if (!kernel_data_init())
267	goto quit;
268	kernel_data = (KernelData *)Mac2HostAddr(KERNEL_DATA_BASE);
269	emulator_data = &kernel_data->ed;
270	KernelDataAddr = KERNEL_DATA_BASE;
271	D(bug("Kernel Data at %p (%08x)\n", kernel_data, KERNEL_DATA_BASE));
272	D(bug("Emulator Data at %p (%08x)\n", emulator_data, KERNEL_DATA_BASE + offsetof(KernelData, ed)));
273
274	// Create area for DR Cache
275	if (vm_mac_acquire(DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
276	sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
277	ErrorAlert(str);
278	goto quit;
279	}
280	dr_emulator_area_mapped = true;
281	if (vm_mac_acquire(DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
282	sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
283	ErrorAlert(str);
284	goto quit;
285	}
286	dr_cache_area_mapped = true;
287	DRCacheAddr = (uint32)Mac2HostAddr(DR_CACHE_BASE);
288	D(bug("DR Cache at %p (%08x)\n", DRCacheAddr, DR_CACHE_BASE));
289
290	// Create area for SheepShaver data
291	if (!SheepMem::Init()) {
292	sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
293	ErrorAlert(str);
294	goto quit;
295	}
296
297	// Create area for Mac ROM
298	if (vm_mac_acquire(ROM_BASE, ROM_AREA_SIZE) < 0) {
299	sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
300	ErrorAlert(str);
301	goto quit;
302	}
303	ROMBase = ROM_BASE;
304	ROMBaseHost = Mac2HostAddr(ROMBase);
305	rom_area_mapped = true;
306	D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROMBase));
307
308	// Create area for Mac RAM
309	RAMSize = PrefsFindInt32("ramsize");
310	if (RAMSize < 810241024) {
311	WarningAlert(GetString(STR_SMALL_RAM_WARN));
312	RAMSize = 810241024;
313	}
314	RAMBase = 0;
315	if (vm_mac_acquire(RAMBase, RAMSize) < 0) {
316	sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
317	ErrorAlert(str);
318	goto quit;
319	}
320	RAMBaseHost = Mac2HostAddr(RAMBase);
321	ram_area_mapped = true;
322	D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));
323
324	if (RAMBase > ROMBase) {
325	ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
326	goto quit;
327	}
328
329	// Load Mac ROM
330	rom_path = PrefsFindString("rom");
331	rom_fh = CreateFile(rom_path && *rom_path ? rom_path : ROM_FILE_NAME,
332	GENERIC_READ, 0, NULL, OPEN_EXISTING,
333	FILE_ATTRIBUTE_NORMAL, NULL);
334
335	if (rom_fh == INVALID_HANDLE_VALUE) {
336	rom_fh = CreateFile(ROM_FILE_NAME2,
337	GENERIC_READ, 0, NULL, OPEN_EXISTING,
338	FILE_ATTRIBUTE_NORMAL, NULL);
339
340	if (rom_fh == INVALID_HANDLE_VALUE) {
341	ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
342	goto quit;
343	}
344	}
345	printf(GetString(STR_READING_ROM_FILE));
346	rom_size = GetFileSize(rom_fh, NULL);
347	rom_tmp = new uint8[ROM_SIZE];
348	ReadFile(rom_fh, (void *)rom_tmp, ROM_SIZE, &actual, NULL);
349	CloseHandle(rom_fh);
350
351	// Decode Mac ROM
352	if (!DecodeROM(rom_tmp, actual)) {
353	if (rom_size != 410241024) {
354	ErrorAlert(GetString(STR_ROM_SIZE_ERR));
355	goto quit;
356	} else {
357	ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
358	goto quit;
359	}
360	}
361	delete[] rom_tmp;
362
363	// Initialize native timers
364	timer_init();
365
366	// Initialize everything
367	if (!InitAll(NULL))
368	goto quit;
369	D(bug("Initialization complete\n"));
370
371	// Write protect ROM
372	vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ);
373
374	// Start 60Hz thread
375	tick_thread_cancel = false;
376	tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
377	SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
378	D(bug("Tick thread installed (%ld)\n", tick_thread));
379
380	// Start NVRAM watchdog thread
381	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
382	nvram_thread_cancel = false;
383	nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
384	SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
385	D(bug("NVRAM thread installed (%ld)\n", nvram_thread));
386
387	// Get my thread ID and jump to ROM boot routine
388	emul_thread = GetCurrentThread();
389	D(bug("Jumping to ROM\n"));
390	jump_to_rom(ROMBase + 0x310000);
391	D(bug("Returned from ROM\n"));
392
393	quit:
394	Quit();
395	return 0;
396	}
397
398
399	/*
400	* Cleanup and quit
401	*/
402
403	static void Quit(void)
404	{
405	// Exit PowerPC emulation
406	exit_emul_ppc();
407
408	// Stop 60Hz thread
409	if (tick_thread_active) {
410	tick_thread_cancel = true;
411	wait_thread(tick_thread);
412	}
413
414	// Stop NVRAM watchdog thread
415	if (nvram_thread_active) {
416	nvram_thread_cancel = true;
417	wait_thread(nvram_thread);
418	}
419
420	// Deinitialize everything
421	ExitAll();
422
423	// Delete SheepShaver globals
424	SheepMem::Exit();
425
426	// Delete RAM area
427	if (ram_area_mapped)
428	vm_mac_release(RAMBase, RAMSize);
429
430	// Delete ROM area
431	if (rom_area_mapped)
432	vm_mac_release(ROMBase, ROM_AREA_SIZE);
433
434	// Delete DR cache areas
435	if (dr_emulator_area_mapped)
436	vm_mac_release(DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
437	if (dr_cache_area_mapped)
438	vm_mac_release(DR_CACHE_BASE, DR_CACHE_SIZE);
439
440	// Delete Kernel Data area
441	kernel_data_exit();
442
443	// Exit system routines
444	SysExit();
445
446	// Exit preferences
447	PrefsExit();
448
449	// Release win32 libraries
450	KernelExit();
451
452	#ifdef ENABLE_MON
453	// Exit mon
454	mon_exit();
455	#endif
456
457	exit(0);
458	}
459
460
461	/*
462	* Initialize Kernel Data segments
463	*/
464
465	static HANDLE kernel_handle; // Shared memory handle for Kernel Data
466	static DWORD allocation_granule; // Minimum size of allocateable are (64K)
467	static DWORD kernel_area_size; // Size of Kernel Data area
468
469	static bool kernel_data_init(void)
470	{
471	char str[256];
472	SYSTEM_INFO si;
473	GetSystemInfo(&si);
474	allocation_granule = si.dwAllocationGranularity;
475	kernel_area_size = (KERNEL_AREA_SIZE + allocation_granule - 1) & -allocation_granule;
476
477	char rcs[10];
478	LPVOID kernel_addr;
479	kernel_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, kernel_area_size, NULL);
480	if (kernel_handle == NULL) {
481	sprintf(rcs, "%d", GetLastError());
482	sprintf(str, GetString(STR_KD_SHMGET_ERR), rcs);
483	ErrorAlert(str);
484	return false;
485	}
486	kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule);
487	if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
488	sprintf(rcs, "%d", GetLastError());
489	sprintf(str, GetString(STR_KD_SHMAT_ERR), rcs);
490	ErrorAlert(str);
491	return false;
492	}
493	kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule);
494	if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
495	sprintf(rcs, "%d", GetLastError());
496	sprintf(str, GetString(STR_KD2_SHMAT_ERR), rcs);
497	ErrorAlert(str);
498	return false;
499	}
500	return true;
501	}
502
503
504	/*
505	* Deallocate Kernel Data segments
506	*/
507
508	static void kernel_data_exit(void)
509	{
510	if (kernel_handle) {
511	UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule));
512	UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule));
513	CloseHandle(kernel_handle);
514	}
515	}
516
517
518	/*
519	* Jump into Mac ROM, start 680x0 emulator
520	*/
521
522	void jump_to_rom(uint32 entry)
523	{
524	init_emul_ppc();
525	emul_ppc(entry);
526	}
527
528
529	/*
530	* Quit emulator (cause return from jump_to_rom)
531	*/
532
533	void QuitEmulator(void)
534	{
535	Quit();
536	}
537
538
539	/*
540	* Pause/resume emulator
541	*/
542
543	void PauseEmulator(void)
544	{
545	SuspendThread(emul_thread);
546	}
547
548	void ResumeEmulator(void)
549	{
550	ResumeThread(emul_thread);
551	}
552
553
554	/*
555	* Dump 68k registers
556	*/
557
558	void Dump68kRegs(M68kRegisters *r)
559	{
560	// Display 68k registers
561	for (int i=0; i<8; i++) {
562	printf("d%d: %08x", i, r->d[i]);
563	if (i == 3 \|\| i == 7)
564	printf("\n");
565	else
566	printf(", ");
567	}
568	for (int i=0; i<8; i++) {
569	printf("a%d: %08x", i, r->a[i]);
570	if (i == 3 \|\| i == 7)
571	printf("\n");
572	else
573	printf(", ");
574	}
575	}
576
577
578	/*
579	* Make code executable
580	*/
581
582	void MakeExecutable(int dummy, uint32 start, uint32 length)
583	{
584	if ((start >= ROMBase) && (start < (ROMBase + ROM_SIZE)))
585	return;
586	FlushCodeCache(start, start + length);
587	}
588
589
590	/*
591	* NVRAM watchdog thread (saves NVRAM every minute)
592	*/
593
594	static void nvram_watchdog(void)
595	{
596	if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
597	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
598	SaveXPRAM();
599	}
600	}
601
602	static DWORD nvram_func(void *arg)
603	{
604	while (!nvram_thread_cancel) {
605	for (int i=0; i<60 && !nvram_thread_cancel; i++)
606	Delay_usec(999999); // Only wait 1 second so we quit promptly when nvram_thread_cancel becomes true
607	nvram_watchdog();
608	}
609	return 0;
610	}
611
612
613	/*
614	* 60Hz thread (really 60.15Hz)
615	*/
616
617	static DWORD tick_func(void *arg)
618	{
619	int tick_counter = 0;
620	uint64 start = GetTicks_usec();
621	int64 ticks = 0;
622	uint64 next = GetTicks_usec();
623
624	while (!tick_thread_cancel) {
625
626	// Wait
627	next += 16625;
628	int64 delay = next - GetTicks_usec();
629	if (delay > 0)
630	Delay_usec(delay);
631	else if (delay < -16625)
632	next = GetTicks_usec();
633	ticks++;
634
635	// Pseudo Mac 1Hz interrupt, update local time
636	if (++tick_counter > 60) {
637	tick_counter = 0;
638	WriteMacInt32(0x20c, TimerDateTime());
639	}
640
641	// Trigger 60Hz interrupt
642	if (ReadMacInt32(XLM_IRQ_NEST) == 0) {
643	SetInterruptFlag(INTFLAG_VIA);
644	TriggerInterrupt();
645	}
646	}
647
648	uint64 end = GetTicks_usec();
649	D(bug("%lu ticks in %lu usec = %f ticks/sec\n", (unsigned long)ticks, (unsigned long)(end - start), ticks * 1000000.0 / (end - start)));
650	return 0;
651	}
652
653
654	/*
655	* Mutexes
656	*/
657
658	struct B2_mutex {
659	mutex_t m;
660	};
661
662	B2_mutex *B2_create_mutex(void)
663	{
664	return new B2_mutex;
665	}
666
667	void B2_lock_mutex(B2_mutex *mutex)
668	{
669	mutex->m.lock();
670	}
671
672	void B2_unlock_mutex(B2_mutex *mutex)
673	{
674	mutex->m.unlock();
675	}
676
677	void B2_delete_mutex(B2_mutex *mutex)
678	{
679	delete mutex;
680	}
681
682
683	/*
684	* Interrupt flags (must be handled atomically!)
685	*/
686
687	volatile uint32 InterruptFlags = 0;
688	static mutex_t intflags_mutex;
689
690	void SetInterruptFlag(uint32 flag)
691	{
692	intflags_mutex.lock();
693	InterruptFlags \|= flag;
694	intflags_mutex.unlock();
695	}
696
697	void ClearInterruptFlag(uint32 flag)
698	{
699	intflags_mutex.lock();
700	InterruptFlags &= ~flag;
701	intflags_mutex.unlock();
702	}
703
704
705	/*
706	* Disable interrupts
707	*/
708
709	void DisableInterrupt(void)
710	{
711	WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) + 1);
712	}
713
714
715	/*
716	* Enable interrupts
717	*/
718
719	void EnableInterrupt(void)
720	{
721	WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) - 1);
722	}
723
724
725	/*
726	* Helpers to share 32-bit addressable data with MacOS
727	*/
728
729	bool SheepMem::Init(void)
730	{
731	// Size of a native page
732	page_size = vm_get_page_size();
733
734	// Allocate SheepShaver globals
735	proc = base;
736	if (vm_mac_acquire(base, size) < 0)
737	return false;
738
739	// Allocate page with all bits set to 0, right in the middle
740	// This is also used to catch undesired overlaps between proc and data areas
741	zero_page = proc + (size / 2);
742	Mac_memset(zero_page, 0, page_size);
743	if (vm_protect(Mac2HostAddr(zero_page), page_size, VM_PAGE_READ) < 0)
744	return false;
745
746	// Allocate alternate stack for PowerPC interrupt routine
747	sig_stack = base + size;
748	if (vm_mac_acquire(sig_stack, SIG_STACK_SIZE) < 0)
749	return false;
750
751	data = base + size;
752	return true;
753	}
754
755	void SheepMem::Exit(void)
756	{
757	if (data) {
758	// Delete SheepShaver globals
759	vm_mac_release(base, size);
760
761	// Delete alternate stack for PowerPC interrupt routine
762	vm_mac_release(sig_stack, SIG_STACK_SIZE);
763	}
764	}
765
766
767	/*
768	* Get the main window handle
769	*/
770
771	#ifdef USE_SDL_VIDEO
772	#include <SDL_syswm.h>
773	HWND GetMainWindowHandle(void)
774	{
775	SDL_SysWMinfo wmInfo;
776	SDL_VERSION(&wmInfo.version);
777	return SDL_GetWMInfo(&wmInfo) ? wmInfo.window : NULL;
778	}
779	#endif
780
781
782	/*
783	* Display alert
784	*/
785
786	static void display_alert(int title_id, const char *text, int flags)
787	{
788	HWND hMainWnd = GetMainWindowHandle();
789	MessageBox(hMainWnd, text, GetString(title_id), MB_OK \| flags);
790	}
791
792
793	/*
794	* Display error alert
795	*/
796
797	void ErrorAlert(const char *text)
798	{
799	if (PrefsFindBool("nogui"))
800	return;
801
802	VideoQuitFullScreen();
803	display_alert(STR_ERROR_ALERT_TITLE, text, MB_ICONSTOP);
804	}
805
806
807	/*
808	* Display warning alert
809	*/
810
811	void WarningAlert(const char *text)
812	{
813	if (PrefsFindBool("nogui"))
814	return;
815
816	display_alert(STR_WARNING_ALERT_TITLE, text, MB_ICONINFORMATION);
817	}
818
819
820	/*
821	* Display choice alert
822	*/
823
824	bool ChoiceAlert(const char text, const char pos, const char *neg)
825	{
826	printf(GetString(STR_SHELL_WARNING_PREFIX), text);
827	return false; //!!
828	}