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 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)
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(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;
        }
        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;
        }
        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 > 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 native timers
        timer_init();

        // 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(RAMBase, 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();

        // 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 >= 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("%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:	1.15
Committed:	2008-01-01T09:47:39Z (16 years, 5 months ago) by gbeauche
Branch:	MAIN
Changes since 1.14:	+1 -1 lines
Log Message:	Happy New Year!
#	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 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	DWORD win_os; // Windows OS id
77	DWORD win_os_major; // Windows OS version major
78
79
80	// Global variables
81	static int kernel_area = -1; // SHM ID of Kernel Data area
82	static bool rom_area_mapped = false; // Flag: Mac ROM mmap()ped
83	static bool ram_area_mapped = false; // Flag: Mac RAM mmap()ped
84	static bool dr_cache_area_mapped = false; // Flag: Mac DR Cache mmap()ped
85	static bool dr_emulator_area_mapped = false;// Flag: Mac DR Emulator mmap()ped
86	static KernelData *kernel_data; // Pointer to Kernel Data
87	static EmulatorData *emulator_data;
88
89	static uint8 last_xpram[XPRAM_SIZE]; // Buffer for monitoring XPRAM changes
90	static bool nvram_thread_active = false; // Flag: NVRAM watchdog installed
91	static volatile bool nvram_thread_cancel; // Flag: Cancel NVRAM thread
92	static HANDLE nvram_thread = NULL; // NVRAM watchdog
93	static bool tick_thread_active = false; // Flag: MacOS thread installed
94	static volatile bool tick_thread_cancel; // Flag: Cancel 60Hz thread
95	static HANDLE tick_thread = NULL; // 60Hz thread
96	static HANDLE emul_thread = NULL; // MacOS thread
97	static uintptr sig_stack = 0; // Stack for PowerPC interrupt routine
98
99	uint32 SheepMem::page_size; // Size of a native page
100	uintptr SheepMem::zero_page = 0; // Address of ro page filled in with zeros
101	uintptr SheepMem::base = 0x60000000; // Address of SheepShaver data
102	uintptr SheepMem::proc; // Bottom address of SheepShave procedures
103	uintptr SheepMem::data; // Top of SheepShaver data (stack like storage)
104
105
106	// Prototypes
107	static bool kernel_data_init(void);
108	static void kernel_data_exit(void);
109	static void Quit(void);
110	static DWORD WINAPI nvram_func(void *arg);
111	static DWORD WINAPI tick_func(void *arg);
112
113	static void jump_to_rom(uint32 entry);
114	extern void emul_ppc(uint32 start);
115	extern void init_emul_ppc(void);
116	extern void exit_emul_ppc(void);
117	sigsegv_return_t sigsegv_handler(sigsegv_info_t *sip);
118
119
120	/*
121	* Return signal stack base
122	*/
123
124	uintptr SignalStackBase(void)
125	{
126	return sig_stack + SIG_STACK_SIZE;
127	}
128
129
130	/*
131	* Memory management helpers
132	*/
133
134	static inline int vm_mac_acquire(uint32 addr, uint32 size)
135	{
136	return vm_acquire_fixed(Mac2HostAddr(addr), size);
137	}
138
139	static inline int vm_mac_release(uint32 addr, uint32 size)
140	{
141	return vm_release(Mac2HostAddr(addr), size);
142	}
143
144
145	/*
146	* Main program
147	*/
148
149	static void usage(const char *prg_name)
150	{
151	printf("Usage: %s [OPTION...]\n", prg_name);
152	printf("\nUnix options:\n");
153	printf(" --display STRING\n X display to use\n");
154	PrefsPrintUsage();
155	exit(0);
156	}
157
158	int main(int argc, char **argv)
159	{
160	char str[256];
161	int16 i16;
162	HANDLE rom_fh;
163	const char *rom_path;
164	uint32 rom_size;
165	DWORD actual;
166	uint8 *rom_tmp;
167
168	// Initialize variables
169	RAMBase = 0;
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	// Check we are using a Windows NT kernel >= 4.0
189	OSVERSIONINFO osvi;
190	ZeroMemory(&osvi, sizeof(OSVERSIONINFO));
191	osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
192	if (!GetVersionEx(&osvi)) {
193	ErrorAlert("Could not determine OS type");
194	QuitEmulator();
195	}
196	win_os = osvi.dwPlatformId;
197	win_os_major = osvi.dwMajorVersion;
198	if (win_os != VER_PLATFORM_WIN32_NT \|\| win_os_major < 4) {
199	ErrorAlert(GetString(STR_NO_WIN32_NT_4));
200	QuitEmulator();
201	}
202
203	// Check that drivers are installed
204	if (!check_drivers())
205	QuitEmulator();
206
207	// Load win32 libraries
208	KernelInit();
209
210	// FIXME: default to DIB driver
211	if (getenv("SDL_VIDEODRIVER") == NULL)
212	putenv("SDL_VIDEODRIVER=windib");
213
214	// Initialize SDL system
215	int sdl_flags = 0;
216	#ifdef USE_SDL_VIDEO
217	sdl_flags \|= SDL_INIT_VIDEO;
218	#endif
219	#ifdef USE_SDL_AUDIO
220	sdl_flags \|= SDL_INIT_AUDIO;
221	#endif
222	assert(sdl_flags != 0);
223	if (SDL_Init(sdl_flags) == -1) {
224	char str[256];
225	sprintf(str, "Could not initialize SDL: %s.\n", SDL_GetError());
226	ErrorAlert(str);
227	goto quit;
228	}
229	atexit(SDL_Quit);
230
231	#ifdef ENABLE_MON
232	// Initialize mon
233	mon_init();
234	#endif
235
236	// Install SIGSEGV handler for CPU emulator
237	if (!sigsegv_install_handler(sigsegv_handler)) {
238	sprintf(str, GetString(STR_SIGSEGV_INSTALL_ERR), strerror(errno));
239	ErrorAlert(str);
240	goto quit;
241	}
242
243	// Initialize VM system
244	vm_init();
245
246	// Get system info
247	PVR = 0x00040000; // Default: 604
248	CPUClockSpeed = 100000000; // Default: 100MHz
249	BusClockSpeed = 100000000; // Default: 100MHz
250	TimebaseSpeed = 25000000; // Default: 25MHz
251	PVR = 0x000c0000; // Default: 7400 (with AltiVec)
252	D(bug("PVR: %08x (assumed)\n", PVR));
253
254	// Init system routines
255	SysInit();
256
257	// Show preferences editor
258	if (!PrefsFindBool("nogui"))
259	if (!PrefsEditor())
260	goto quit;
261
262	// Create areas for Kernel Data
263	if (!kernel_data_init())
264	goto quit;
265	kernel_data = (KernelData *)Mac2HostAddr(KERNEL_DATA_BASE);
266	emulator_data = &kernel_data->ed;
267	KernelDataAddr = KERNEL_DATA_BASE;
268	D(bug("Kernel Data at %p (%08x)\n", kernel_data, KERNEL_DATA_BASE));
269	D(bug("Emulator Data at %p (%08x)\n", emulator_data, KERNEL_DATA_BASE + offsetof(KernelData, ed)));
270
271	// Create area for DR Cache
272	if (vm_mac_acquire(DR_EMULATOR_BASE, DR_EMULATOR_SIZE) < 0) {
273	sprintf(str, GetString(STR_DR_EMULATOR_MMAP_ERR), strerror(errno));
274	ErrorAlert(str);
275	goto quit;
276	}
277	dr_emulator_area_mapped = true;
278	if (vm_mac_acquire(DR_CACHE_BASE, DR_CACHE_SIZE) < 0) {
279	sprintf(str, GetString(STR_DR_CACHE_MMAP_ERR), strerror(errno));
280	ErrorAlert(str);
281	goto quit;
282	}
283	dr_cache_area_mapped = true;
284	DRCacheAddr = (uint32)Mac2HostAddr(DR_CACHE_BASE);
285	D(bug("DR Cache at %p (%08x)\n", DRCacheAddr, DR_CACHE_BASE));
286
287	// Create area for SheepShaver data
288	if (!SheepMem::Init()) {
289	sprintf(str, GetString(STR_SHEEP_MEM_MMAP_ERR), strerror(errno));
290	ErrorAlert(str);
291	goto quit;
292	}
293
294	// Create area for Mac ROM
295	if (vm_mac_acquire(ROM_BASE, ROM_AREA_SIZE) < 0) {
296	sprintf(str, GetString(STR_ROM_MMAP_ERR), strerror(errno));
297	ErrorAlert(str);
298	goto quit;
299	}
300	ROMBaseHost = Mac2HostAddr(ROM_BASE);
301	rom_area_mapped = true;
302	D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROM_BASE));
303
304	// Create area for Mac RAM
305	RAMSize = PrefsFindInt32("ramsize");
306	if (RAMSize < 810241024) {
307	WarningAlert(GetString(STR_SMALL_RAM_WARN));
308	RAMSize = 810241024;
309	}
310	RAMBase = 0;
311	if (vm_mac_acquire(RAMBase, RAMSize) < 0) {
312	sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
313	ErrorAlert(str);
314	goto quit;
315	}
316	RAMBaseHost = Mac2HostAddr(RAMBase);
317	ram_area_mapped = true;
318	D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));
319
320	if (RAMBase > ROM_BASE) {
321	ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
322	goto quit;
323	}
324
325	// Load Mac ROM
326	rom_path = PrefsFindString("rom");
327	rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME,
328	GENERIC_READ, 0, NULL, OPEN_EXISTING,
329	FILE_ATTRIBUTE_NORMAL, NULL);
330
331	if (rom_fh == INVALID_HANDLE_VALUE) {
332	rom_fh = CreateFile(rom_path ? rom_path : ROM_FILE_NAME2,
333	GENERIC_READ, 0, NULL, OPEN_EXISTING,
334	FILE_ATTRIBUTE_NORMAL, NULL);
335
336	if (rom_fh == INVALID_HANDLE_VALUE) {
337	ErrorAlert(GetString(STR_NO_ROM_FILE_ERR));
338	goto quit;
339	}
340	}
341	printf(GetString(STR_READING_ROM_FILE));
342	rom_size = GetFileSize(rom_fh, NULL);
343	rom_tmp = new uint8[ROM_SIZE];
344	ReadFile(rom_fh, (void *)rom_tmp, ROM_SIZE, &actual, NULL);
345	CloseHandle(rom_fh);
346
347	// Decode Mac ROM
348	if (!DecodeROM(rom_tmp, actual)) {
349	if (rom_size != 410241024) {
350	ErrorAlert(GetString(STR_ROM_SIZE_ERR));
351	goto quit;
352	} else {
353	ErrorAlert(GetString(STR_ROM_FILE_READ_ERR));
354	goto quit;
355	}
356	}
357	delete[] rom_tmp;
358
359	// Initialize native timers
360	timer_init();
361
362	// Initialize everything
363	if (!InitAll())
364	goto quit;
365	D(bug("Initialization complete\n"));
366
367	// Write protect ROM
368	vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ);
369
370	// Start 60Hz thread
371	tick_thread_cancel = false;
372	tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
373	SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
374	D(bug("Tick thread installed (%ld)\n", tick_thread));
375
376	// Start NVRAM watchdog thread
377	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
378	nvram_thread_cancel = false;
379	nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
380	SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
381	D(bug("NVRAM thread installed (%ld)\n", nvram_thread));
382
383	// Get my thread ID and jump to ROM boot routine
384	emul_thread = GetCurrentThread();
385	D(bug("Jumping to ROM\n"));
386	jump_to_rom(ROM_BASE + 0x310000);
387	D(bug("Returned from ROM\n"));
388
389	quit:
390	Quit();
391	return 0;
392	}
393
394
395	/*
396	* Cleanup and quit
397	*/
398
399	static void Quit(void)
400	{
401	// Exit PowerPC emulation
402	exit_emul_ppc();
403
404	// Stop 60Hz thread
405	if (tick_thread_active) {
406	tick_thread_cancel = true;
407	wait_thread(tick_thread);
408	}
409
410	// Stop NVRAM watchdog thread
411	if (nvram_thread_active) {
412	nvram_thread_cancel = true;
413	wait_thread(nvram_thread);
414	}
415
416	// Deinitialize everything
417	ExitAll();
418
419	// Delete SheepShaver globals
420	SheepMem::Exit();
421
422	// Delete RAM area
423	if (ram_area_mapped)
424	vm_mac_release(RAMBase, RAMSize);
425
426	// Delete ROM area
427	if (rom_area_mapped)
428	vm_mac_release(ROM_BASE, ROM_AREA_SIZE);
429
430	// Delete DR cache areas
431	if (dr_emulator_area_mapped)
432	vm_mac_release(DR_EMULATOR_BASE, DR_EMULATOR_SIZE);
433	if (dr_cache_area_mapped)
434	vm_mac_release(DR_CACHE_BASE, DR_CACHE_SIZE);
435
436	// Delete Kernel Data area
437	kernel_data_exit();
438
439	// Exit system routines
440	SysExit();
441
442	// Exit preferences
443	PrefsExit();
444
445	// Release win32 libraries
446	KernelExit();
447
448	#ifdef ENABLE_MON
449	// Exit mon
450	mon_exit();
451	#endif
452
453	exit(0);
454	}
455
456
457	/*
458	* Initialize Kernel Data segments
459	*/
460
461	static HANDLE kernel_handle; // Shared memory handle for Kernel Data
462	static DWORD allocation_granule; // Minimum size of allocateable are (64K)
463	static DWORD kernel_area_size; // Size of Kernel Data area
464
465	static bool kernel_data_init(void)
466	{
467	char str[256];
468	SYSTEM_INFO si;
469	GetSystemInfo(&si);
470	allocation_granule = si.dwAllocationGranularity;
471	kernel_area_size = (KERNEL_AREA_SIZE + allocation_granule - 1) & -allocation_granule;
472
473	char rcs[10];
474	LPVOID kernel_addr;
475	kernel_handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, kernel_area_size, NULL);
476	if (kernel_handle == NULL) {
477	sprintf(rcs, "%d", GetLastError());
478	sprintf(str, GetString(STR_KD_SHMGET_ERR), rcs);
479	ErrorAlert(str);
480	return false;
481	}
482	kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule);
483	if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
484	sprintf(rcs, "%d", GetLastError());
485	sprintf(str, GetString(STR_KD_SHMAT_ERR), rcs);
486	ErrorAlert(str);
487	return false;
488	}
489	kernel_addr = (LPVOID)Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule);
490	if (MapViewOfFileEx(kernel_handle, FILE_MAP_READ \| FILE_MAP_WRITE, 0, 0, kernel_area_size, kernel_addr) != kernel_addr) {
491	sprintf(rcs, "%d", GetLastError());
492	sprintf(str, GetString(STR_KD2_SHMAT_ERR), rcs);
493	ErrorAlert(str);
494	return false;
495	}
496	return true;
497	}
498
499
500	/*
501	* Deallocate Kernel Data segments
502	*/
503
504	static void kernel_data_exit(void)
505	{
506	if (kernel_handle) {
507	UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA_BASE & -allocation_granule));
508	UnmapViewOfFile(Mac2HostAddr(KERNEL_DATA2_BASE & -allocation_granule));
509	CloseHandle(kernel_handle);
510	}
511	}
512
513
514	/*
515	* Jump into Mac ROM, start 680x0 emulator
516	*/
517
518	void jump_to_rom(uint32 entry)
519	{
520	init_emul_ppc();
521	emul_ppc(entry);
522	}
523
524
525	/*
526	* Quit emulator (cause return from jump_to_rom)
527	*/
528
529	void QuitEmulator(void)
530	{
531	Quit();
532	}
533
534
535	/*
536	* Pause/resume emulator
537	*/
538
539	void PauseEmulator(void)
540	{
541	SuspendThread(emul_thread);
542	}
543
544	void ResumeEmulator(void)
545	{
546	ResumeThread(emul_thread);
547	}
548
549
550	/*
551	* Dump 68k registers
552	*/
553
554	void Dump68kRegs(M68kRegisters *r)
555	{
556	// Display 68k registers
557	for (int i=0; i<8; i++) {
558	printf("d%d: %08x", i, r->d[i]);
559	if (i == 3 \|\| i == 7)
560	printf("\n");
561	else
562	printf(", ");
563	}
564	for (int i=0; i<8; i++) {
565	printf("a%d: %08x", i, r->a[i]);
566	if (i == 3 \|\| i == 7)
567	printf("\n");
568	else
569	printf(", ");
570	}
571	}
572
573
574	/*
575	* Make code executable
576	*/
577
578	void MakeExecutable(int dummy, uint32 start, uint32 length)
579	{
580	if ((start >= ROM_BASE) && (start < (ROM_BASE + ROM_SIZE)))
581	return;
582	FlushCodeCache(start, start + length);
583	}
584
585
586	/*
587	* NVRAM watchdog thread (saves NVRAM every minute)
588	*/
589
590	static void nvram_watchdog(void)
591	{
592	if (memcmp(last_xpram, XPRAM, XPRAM_SIZE)) {
593	memcpy(last_xpram, XPRAM, XPRAM_SIZE);
594	SaveXPRAM();
595	}
596	}
597
598	static DWORD nvram_func(void *arg)
599	{
600	while (!nvram_thread_cancel) {
601	for (int i=0; i<60 && !nvram_thread_cancel; i++)
602	Delay_usec(999999); // Only wait 1 second so we quit promptly when nvram_thread_cancel becomes true
603	nvram_watchdog();
604	}
605	return 0;
606	}
607
608
609	/*
610	* 60Hz thread (really 60.15Hz)
611	*/
612
613	static DWORD tick_func(void *arg)
614	{
615	int tick_counter = 0;
616	uint64 start = GetTicks_usec();
617	int64 ticks = 0;
618	uint64 next = GetTicks_usec();
619
620	while (!tick_thread_cancel) {
621
622	// Wait
623	next += 16625;
624	int64 delay = next - GetTicks_usec();
625	if (delay > 0)
626	Delay_usec(delay);
627	else if (delay < -16625)
628	next = GetTicks_usec();
629	ticks++;
630
631	// Pseudo Mac 1Hz interrupt, update local time
632	if (++tick_counter > 60) {
633	tick_counter = 0;
634	WriteMacInt32(0x20c, TimerDateTime());
635	}
636
637	// Trigger 60Hz interrupt
638	if (ReadMacInt32(XLM_IRQ_NEST) == 0) {
639	SetInterruptFlag(INTFLAG_VIA);
640	TriggerInterrupt();
641	}
642	}
643
644	uint64 end = GetTicks_usec();
645	D(bug("%lu ticks in %lu usec = %f ticks/sec\n", (unsigned long)ticks, (unsigned long)(end - start), ticks * 1000000.0 / (end - start)));
646	return 0;
647	}
648
649
650	/*
651	* Mutexes
652	*/
653
654	struct B2_mutex {
655	mutex_t m;
656	};
657
658	B2_mutex *B2_create_mutex(void)
659	{
660	return new B2_mutex;
661	}
662
663	void B2_lock_mutex(B2_mutex *mutex)
664	{
665	mutex->m.lock();
666	}
667
668	void B2_unlock_mutex(B2_mutex *mutex)
669	{
670	mutex->m.unlock();
671	}
672
673	void B2_delete_mutex(B2_mutex *mutex)
674	{
675	delete mutex;
676	}
677
678
679	/*
680	* Interrupt flags (must be handled atomically!)
681	*/
682
683	volatile uint32 InterruptFlags = 0;
684	static mutex_t intflags_mutex;
685
686	void SetInterruptFlag(uint32 flag)
687	{
688	intflags_mutex.lock();
689	InterruptFlags \|= flag;
690	intflags_mutex.unlock();
691	}
692
693	void ClearInterruptFlag(uint32 flag)
694	{
695	intflags_mutex.lock();
696	InterruptFlags &= ~flag;
697	intflags_mutex.unlock();
698	}
699
700
701	/*
702	* Disable interrupts
703	*/
704
705	void DisableInterrupt(void)
706	{
707	WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) + 1);
708	}
709
710
711	/*
712	* Enable interrupts
713	*/
714
715	void EnableInterrupt(void)
716	{
717	WriteMacInt32(XLM_IRQ_NEST, int32(ReadMacInt32(XLM_IRQ_NEST)) - 1);
718	}
719
720
721	/*
722	* Helpers to share 32-bit addressable data with MacOS
723	*/
724
725	bool SheepMem::Init(void)
726	{
727	// Size of a native page
728	page_size = vm_get_page_size();
729
730	// Allocate SheepShaver globals
731	proc = base;
732	if (vm_mac_acquire(base, size) < 0)
733	return false;
734
735	// Allocate page with all bits set to 0, right in the middle
736	// This is also used to catch undesired overlaps between proc and data areas
737	zero_page = proc + (size / 2);
738	Mac_memset(zero_page, 0, page_size);
739	if (vm_protect(Mac2HostAddr(zero_page), page_size, VM_PAGE_READ) < 0)
740	return false;
741
742	// Allocate alternate stack for PowerPC interrupt routine
743	sig_stack = base + size;
744	if (vm_mac_acquire(sig_stack, SIG_STACK_SIZE) < 0)
745	return false;
746
747	data = base + size;
748	return true;
749	}
750
751	void SheepMem::Exit(void)
752	{
753	if (data) {
754	// Delete SheepShaver globals
755	vm_mac_release(base, size);
756
757	// Delete alternate stack for PowerPC interrupt routine
758	vm_mac_release(sig_stack, SIG_STACK_SIZE);
759	}
760	}
761
762
763	/*
764	* Get the main window handle
765	*/
766
767	#ifdef USE_SDL_VIDEO
768	#include <SDL_syswm.h>
769	HWND GetMainWindowHandle(void)
770	{
771	SDL_SysWMinfo wmInfo;
772	SDL_VERSION(&wmInfo.version);
773	return SDL_GetWMInfo(&wmInfo) ? wmInfo.window : NULL;
774	}
775	#endif
776
777
778	/*
779	* Display alert
780	*/
781
782	static void display_alert(int title_id, const char *text, int flags)
783	{
784	HWND hMainWnd = GetMainWindowHandle();
785	MessageBox(hMainWnd, text, GetString(title_id), MB_OK \| flags);
786	}
787
788
789	/*
790	* Display error alert
791	*/
792
793	void ErrorAlert(const char *text)
794	{
795	if (PrefsFindBool("nogui"))
796	return;
797
798	VideoQuitFullScreen();
799	display_alert(STR_ERROR_ALERT_TITLE, text, MB_ICONSTOP);
800	}
801
802
803	/*
804	* Display warning alert
805	*/
806
807	void WarningAlert(const char *text)
808	{
809	if (PrefsFindBool("nogui"))
810	return;
811
812	display_alert(STR_WARNING_ALERT_TITLE, text, MB_ICONINFORMATION);
813	}
814
815
816	/*
817	* Display choice alert
818	*/
819
820	bool ChoiceAlert(const char text, const char pos, const char *neg)
821	{
822	printf(GetString(STR_SHELL_WARNING_PREFIX), text);
823	return false; //!!
824	}