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root/cebix/SheepShaver/src/Windows/main_windows.cpp
Revision: 1.19
Committed: 2009-09-21T03:34:14Z (15 years ago) by asvitkine
Branch: MAIN
CVS Tags: HEAD
Changes since 1.18: +1 -1 lines
Log Message:
Fix builds on platforms that may have gotten broken due to my vmdir changes.

File Contents

# User Rev Content
1 gbeauche 1.1 /*
2     * main_windows.cpp - Emulation core, Windows implementation
3     *
4 gbeauche 1.15 * SheepShaver (C) 1997-2008 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 1.11 #include "kernel_windows.h"
48 gbeauche 1.1
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 asvitkine 1.17 const uintptr ROM_BASE = 0x40800000; // Base address of ROM
62    
63 gbeauche 1.1 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 asvitkine 1.17 uint32 ROMBase; // Base address of Mac ROM
70 gbeauche 1.1 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 gbeauche 1.9 DWORD win_os; // Windows OS id
80     DWORD win_os_major; // Windows OS version major
81 gbeauche 1.1
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 gbeauche 1.3 static HANDLE nvram_thread = NULL; // NVRAM watchdog
96 gbeauche 1.1 static bool tick_thread_active = false; // Flag: MacOS thread installed
97     static volatile bool tick_thread_cancel; // Flag: Cancel 60Hz thread
98 gbeauche 1.3 static HANDLE tick_thread = NULL; // 60Hz thread
99     static HANDLE emul_thread = NULL; // MacOS thread
100 gbeauche 1.1 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 gbeauche 1.3 static DWORD WINAPI nvram_func(void *arg);
114     static DWORD WINAPI tick_func(void *arg);
115 gbeauche 1.1
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 gbeauche 1.14 sigsegv_return_t sigsegv_handler(sigsegv_info_t *sip);
121 gbeauche 1.1
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 asvitkine 1.16 PrefsInit(NULL, argc, argv);
180 gbeauche 1.1
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 gbeauche 1.9 // 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 gbeauche 1.11 // Load win32 libraries
211     KernelInit();
212    
213 gbeauche 1.10 // FIXME: default to DIB driver
214     if (getenv("SDL_VIDEODRIVER") == NULL)
215     putenv("SDL_VIDEODRIVER=windib");
216    
217 gbeauche 1.1 // 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 asvitkine 1.17 ROMBase = ROM_BASE;
304     ROMBaseHost = Mac2HostAddr(ROMBase);
305 gbeauche 1.1 rom_area_mapped = true;
306 asvitkine 1.17 D(bug("ROM area at %p (%08x)\n", ROMBaseHost, ROMBase));
307 gbeauche 1.1
308     // Create area for Mac RAM
309     RAMSize = PrefsFindInt32("ramsize");
310     if (RAMSize < 8*1024*1024) {
311     WarningAlert(GetString(STR_SMALL_RAM_WARN));
312     RAMSize = 8*1024*1024;
313     }
314 gbeauche 1.13 RAMBase = 0;
315     if (vm_mac_acquire(RAMBase, RAMSize) < 0) {
316 gbeauche 1.1 sprintf(str, GetString(STR_RAM_MMAP_ERR), strerror(errno));
317     ErrorAlert(str);
318     goto quit;
319     }
320 gbeauche 1.13 RAMBaseHost = Mac2HostAddr(RAMBase);
321 gbeauche 1.1 ram_area_mapped = true;
322     D(bug("RAM area at %p (%08x)\n", RAMBaseHost, RAMBase));
323    
324 asvitkine 1.17 if (RAMBase > ROMBase) {
325 gbeauche 1.1 ErrorAlert(GetString(STR_RAM_HIGHER_THAN_ROM_ERR));
326     goto quit;
327     }
328    
329     // Load Mac ROM
330     rom_path = PrefsFindString("rom");
331 asvitkine 1.18 rom_fh = CreateFile(rom_path && *rom_path ? rom_path : ROM_FILE_NAME,
332 gbeauche 1.1 GENERIC_READ, 0, NULL, OPEN_EXISTING,
333     FILE_ATTRIBUTE_NORMAL, NULL);
334    
335     if (rom_fh == INVALID_HANDLE_VALUE) {
336 asvitkine 1.18 rom_fh = CreateFile(ROM_FILE_NAME2,
337 gbeauche 1.1 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 != 4*1024*1024) {
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 gbeauche 1.8
363     // Initialize native timers
364     timer_init();
365 gbeauche 1.1
366 gbeauche 1.6 // Initialize everything
367 asvitkine 1.19 if (!InitAll(NULL))
368 gbeauche 1.1 goto quit;
369 gbeauche 1.6 D(bug("Initialization complete\n"));
370 gbeauche 1.1
371     // Write protect ROM
372 gbeauche 1.6 vm_protect(ROMBaseHost, ROM_AREA_SIZE, VM_PAGE_READ);
373 gbeauche 1.1
374     // Start 60Hz thread
375     tick_thread_cancel = false;
376 gbeauche 1.3 tick_thread_active = ((tick_thread = create_thread(tick_func)) != NULL);
377     SetThreadPriority(tick_thread, THREAD_PRIORITY_ABOVE_NORMAL);
378 gbeauche 1.1 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 gbeauche 1.3 nvram_thread_active = ((nvram_thread = create_thread(nvram_func, NULL)) != NULL);
384     SetThreadPriority(nvram_thread, THREAD_PRIORITY_BELOW_NORMAL);
385 gbeauche 1.1 D(bug("NVRAM thread installed (%ld)\n", nvram_thread));
386    
387 gbeauche 1.3 // Get my thread ID and jump to ROM boot routine
388     emul_thread = GetCurrentThread();
389 gbeauche 1.1 D(bug("Jumping to ROM\n"));
390 asvitkine 1.17 jump_to_rom(ROMBase + 0x310000);
391 gbeauche 1.1 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 gbeauche 1.3 wait_thread(tick_thread);
412 gbeauche 1.1 }
413    
414     // Stop NVRAM watchdog thread
415     if (nvram_thread_active) {
416     nvram_thread_cancel = true;
417 gbeauche 1.3 wait_thread(nvram_thread);
418 gbeauche 1.1 }
419    
420 gbeauche 1.6 // Deinitialize everything
421     ExitAll();
422 gbeauche 1.1
423     // Delete SheepShaver globals
424     SheepMem::Exit();
425    
426     // Delete RAM area
427     if (ram_area_mapped)
428 gbeauche 1.13 vm_mac_release(RAMBase, RAMSize);
429 gbeauche 1.1
430     // Delete ROM area
431     if (rom_area_mapped)
432 asvitkine 1.17 vm_mac_release(ROMBase, ROM_AREA_SIZE);
433 gbeauche 1.1
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 gbeauche 1.11 // Release win32 libraries
450     KernelExit();
451    
452 gbeauche 1.1 #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 gbeauche 1.3 SuspendThread(emul_thread);
546 gbeauche 1.1 }
547    
548     void ResumeEmulator(void)
549     {
550 gbeauche 1.3 ResumeThread(emul_thread);
551 gbeauche 1.1 }
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 asvitkine 1.17 if ((start >= ROMBase) && (start < (ROMBase + ROM_SIZE)))
585 gbeauche 1.1 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 gbeauche 1.3 static DWORD nvram_func(void *arg)
603 gbeauche 1.1 {
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 gbeauche 1.3 static DWORD tick_func(void *arg)
618 gbeauche 1.1 {
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 gbeauche 1.13 D(bug("%lu ticks in %lu usec = %f ticks/sec\n", (unsigned long)ticks, (unsigned long)(end - start), ticks * 1000000.0 / (end - start)));
650 gbeauche 1.1 return 0;
651     }
652    
653    
654     /*
655     * Mutexes
656     */
657    
658     struct B2_mutex {
659 gbeauche 1.4 mutex_t m;
660 gbeauche 1.1 };
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 gbeauche 1.4 mutex->m.lock();
670 gbeauche 1.1 }
671    
672     void B2_unlock_mutex(B2_mutex *mutex)
673     {
674 gbeauche 1.4 mutex->m.unlock();
675 gbeauche 1.1 }
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 gbeauche 1.4 static mutex_t intflags_mutex;
689 gbeauche 1.1
690     void SetInterruptFlag(uint32 flag)
691     {
692 gbeauche 1.4 intflags_mutex.lock();
693     InterruptFlags |= flag;
694     intflags_mutex.unlock();
695 gbeauche 1.1 }
696    
697     void ClearInterruptFlag(uint32 flag)
698     {
699 gbeauche 1.4 intflags_mutex.lock();
700     InterruptFlags &= ~flag;
701     intflags_mutex.unlock();
702 gbeauche 1.1 }
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 gbeauche 1.5 page_size = vm_get_page_size();
733 gbeauche 1.1
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 gbeauche 1.12 HWND GetMainWindowHandle(void)
774 gbeauche 1.1 {
775     SDL_SysWMinfo wmInfo;
776 gbeauche 1.12 SDL_VERSION(&wmInfo.version);
777 gbeauche 1.1 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     }