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root/cebix/BasiliskII/src/Unix/sysdeps.h
Revision: 1.35
Committed: 2009-08-17T20:42:26Z (15 years, 2 months ago) by asvitkine
Content type: text/plain
Branch: MAIN
CVS Tags: HEAD
Changes since 1.34: +5 -0 lines
Log Message:
[Charles Srstka]
Attached is a set of patches to port the precise timer that is currently used in the Linux and BeOS builds of SheepShaver to Mac OS X (and any other Mach-based operating systems).

Currently, the Linux build uses the clock_gettime() function to get nanosecond-precision time, and falls back on gettimeofday() if it is not present. Unfortunately, Mac OS X does not currently support clock_gettime(), and gettimeofday() has only microsecond granularity. The Mach kernel, however, has a clock_get_time() function that does very nearly the same thing as clock_gettime(). The patches to BasiliskII cause the timing functions such as timer_current_time() to use clock_get_time() instead of gettimeofday() on Mach-based systems that do not support clock_gettime().

The changes to SheepShaver involve the precise timer. The existing code for Linux uses pthreads and real-time signals to handle the timing. Mac OS X unfortunately does not seem to support real-time signals, so Mach calls are again used to suspend and resume the timer thread in order to attempt to duplicate the Linux and BeOS versions of the timer. The code is somewhat ugly right now, as I decided to leave alone the pre-existing style of the source file, which unfortunately involves #ifdefs scattered throughout the file and some duplication of code. A future patch may want to clean this up to separate out the OS-specific code and put it all together at the top of the file. However, for the time being, this seems to work.

This has not been extensively tested, because I have not been able to get my hands on a good test-case app for the classic Mac OS that would run inside the emulator and try out the timer. However, performance does seem to be better than with the pre-existing code, and nothing seems to have blown up as far as I can tell. I did find a game via a Google search -  Cap'n Magneto - that is known to have problems with Basilisk/SheepShaver's legacy 60 Hz timer, and the opening fade-to-color for this game appears to run much more smoothly with the precise timer code in place.

File Contents

# Content
1 /*
2 * sysdeps.h - System dependent definitions for Unix
3 *
4 * Basilisk II (C) 1997-2008 Christian Bauer
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #ifndef SYSDEPS_H
22 #define SYSDEPS_H
23
24 #ifndef __STDC__
25 #error "Your compiler is not ANSI. Get a real one."
26 #endif
27
28 #include "config.h"
29 #include "user_strings_unix.h"
30
31 #ifndef STDC_HEADERS
32 #error "You don't have ANSI C header files."
33 #endif
34
35 #ifdef HAVE_UNISTD_H
36 # include <sys/types.h>
37 # include <unistd.h>
38 #endif
39
40 #include <netinet/in.h>
41 #include <assert.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45
46 #ifdef HAVE_PTHREADS
47 # include <pthread.h>
48 #endif
49
50 #ifdef HAVE_FCNTL_H
51 # include <fcntl.h>
52 #endif
53
54 #ifdef TIME_WITH_SYS_TIME
55 # include <sys/time.h>
56 # include <time.h>
57 #else
58 # ifdef HAVE_SYS_TIME_H
59 # include <sys/time.h>
60 # else
61 # include <time.h>
62 # endif
63 #endif
64
65 #if defined(__MACH__)
66 #include <mach/clock.h>
67 #endif
68
69 #ifdef ENABLE_NATIVE_M68K
70
71 /* Mac and host address space are the same */
72 #define REAL_ADDRESSING 1
73
74 /* Using 68k natively */
75 #define EMULATED_68K 0
76
77 /* Mac ROM is not write protected */
78 #define ROM_IS_WRITE_PROTECTED 0
79 #define USE_SCRATCHMEM_SUBTERFUGE 1
80
81 #else
82
83 /* Mac and host address space are distinct */
84 #ifndef REAL_ADDRESSING
85 #define REAL_ADDRESSING 0
86 #endif
87
88 /* Using 68k emulator */
89 #define EMULATED_68K 1
90
91 /* The m68k emulator uses a prefetch buffer ? */
92 #define USE_PREFETCH_BUFFER 0
93
94 /* Mac ROM is write protected when banked memory is used */
95 #if REAL_ADDRESSING || DIRECT_ADDRESSING
96 # define ROM_IS_WRITE_PROTECTED 0
97 # define USE_SCRATCHMEM_SUBTERFUGE 1
98 #else
99 # define ROM_IS_WRITE_PROTECTED 1
100 #endif
101
102 #endif
103
104 /* Direct Addressing requires Video on SEGV signals in plain X11 mode */
105 #if DIRECT_ADDRESSING && (!ENABLE_VOSF && !USE_SDL_VIDEO)
106 # undef ENABLE_VOSF
107 # define ENABLE_VOSF 1
108 #endif
109
110 /* ExtFS is supported */
111 #define SUPPORTS_EXTFS 1
112
113 /* BSD socket API supported */
114 #define SUPPORTS_UDP_TUNNEL 1
115
116 /* Use the CPU emulator to check for periodic tasks? */
117 #ifdef HAVE_PTHREADS
118 #define USE_PTHREADS_SERVICES
119 #endif
120 #if EMULATED_68K
121 #if defined(__NetBSD__)
122 #define USE_CPU_EMUL_SERVICES
123 #endif
124 #endif
125 #ifdef USE_CPU_EMUL_SERVICES
126 #undef USE_PTHREADS_SERVICES
127 #endif
128
129
130 /* Data types */
131 typedef unsigned char uint8;
132 typedef signed char int8;
133 #if SIZEOF_SHORT == 2
134 typedef unsigned short uint16;
135 typedef short int16;
136 #elif SIZEOF_INT == 2
137 typedef unsigned int uint16;
138 typedef int int16;
139 #else
140 #error "No 2 byte type, you lose."
141 #endif
142 #if SIZEOF_INT == 4
143 typedef unsigned int uint32;
144 typedef int int32;
145 #elif SIZEOF_LONG == 4
146 typedef unsigned long uint32;
147 typedef long int32;
148 #else
149 #error "No 4 byte type, you lose."
150 #endif
151 #if SIZEOF_LONG == 8
152 typedef unsigned long uint64;
153 typedef long int64;
154 #define VAL64(a) (a ## l)
155 #define UVAL64(a) (a ## ul)
156 #elif SIZEOF_LONG_LONG == 8
157 typedef unsigned long long uint64;
158 typedef long long int64;
159 #define VAL64(a) (a ## LL)
160 #define UVAL64(a) (a ## uLL)
161 #else
162 #error "No 8 byte type, you lose."
163 #endif
164 #if SIZEOF_VOID_P == 4
165 typedef uint32 uintptr;
166 typedef int32 intptr;
167 #elif SIZEOF_VOID_P == 8
168 typedef uint64 uintptr;
169 typedef int64 intptr;
170 #else
171 #error "Unsupported size of pointer"
172 #endif
173
174 #ifndef HAVE_LOFF_T
175 typedef off_t loff_t;
176 #endif
177 #ifndef HAVE_CADDR_T
178 typedef char * caddr_t;
179 #endif
180
181 /* Time data type for Time Manager emulation */
182 #ifdef HAVE_CLOCK_GETTIME
183 typedef struct timespec tm_time_t;
184 #elif defined(__MACH__)
185 typedef mach_timespec_t tm_time_t;
186 #else
187 typedef struct timeval tm_time_t;
188 #endif
189
190 /* Define codes for all the float formats that we know of.
191 * Though we only handle IEEE format. */
192 #define UNKNOWN_FLOAT_FORMAT 0
193 #define IEEE_FLOAT_FORMAT 1
194 #define VAX_FLOAT_FORMAT 2
195 #define IBM_FLOAT_FORMAT 3
196 #define C4X_FLOAT_FORMAT 4
197
198 /* UAE CPU data types */
199 #define uae_s8 int8
200 #define uae_u8 uint8
201 #define uae_s16 int16
202 #define uae_u16 uint16
203 #define uae_s32 int32
204 #define uae_u32 uint32
205 #define uae_s64 int64
206 #define uae_u64 uint64
207 typedef uae_u32 uaecptr;
208
209 /* Alignment restrictions */
210 #if defined(__i386__) || defined(__powerpc__) || defined(__m68k__) || defined(__x86_64__)
211 # define CPU_CAN_ACCESS_UNALIGNED
212 #endif
213
214 /* Timing functions */
215 extern uint64 GetTicks_usec(void);
216 extern void Delay_usec(uint32 usec);
217
218 /* Spinlocks */
219 #ifdef __GNUC__
220
221 #if defined(__powerpc__) || defined(__ppc__)
222 #define HAVE_TEST_AND_SET 1
223 static inline int testandset(volatile int *p)
224 {
225 int ret;
226 __asm__ __volatile__("0: lwarx %0,0,%1\n"
227 " xor. %0,%3,%0\n"
228 " bne 1f\n"
229 " stwcx. %2,0,%1\n"
230 " bne- 0b\n"
231 "1: "
232 : "=&r" (ret)
233 : "r" (p), "r" (1), "r" (0)
234 : "cr0", "memory");
235 return ret;
236 }
237 #endif
238
239 /* FIXME: SheepShaver occasionnally hangs with those locks */
240 #if 0 && (defined(__i386__) || defined(__x86_64__))
241 #define HAVE_TEST_AND_SET 1
242 static inline int testandset(volatile int *p)
243 {
244 long int ret;
245 /* Note: the "xchg" instruction does not need a "lock" prefix */
246 __asm__ __volatile__("xchgl %k0, %1"
247 : "=r" (ret), "=m" (*p)
248 : "0" (1), "m" (*p)
249 : "memory");
250 return ret;
251 }
252 #endif
253
254 #ifdef __s390__
255 #define HAVE_TEST_AND_SET 1
256 static inline int testandset(volatile int *p)
257 {
258 int ret;
259
260 __asm__ __volatile__("0: cs %0,%1,0(%2)\n"
261 " jl 0b"
262 : "=&d" (ret)
263 : "r" (1), "a" (p), "0" (*p)
264 : "cc", "memory" );
265 return ret;
266 }
267 #endif
268
269 #ifdef __alpha__
270 #define HAVE_TEST_AND_SET 1
271 static inline int testandset(volatile int *p)
272 {
273 int ret;
274 unsigned long one;
275
276 __asm__ __volatile__("0: mov 1,%2\n"
277 " ldl_l %0,%1\n"
278 " stl_c %2,%1\n"
279 " beq %2,1f\n"
280 ".subsection 2\n"
281 "1: br 0b\n"
282 ".previous"
283 : "=r" (ret), "=m" (*p), "=r" (one)
284 : "m" (*p));
285 return ret;
286 }
287 #endif
288
289 #ifdef __sparc__
290 #define HAVE_TEST_AND_SET 1
291 static inline int testandset(volatile int *p)
292 {
293 int ret;
294
295 __asm__ __volatile__("ldstub [%1], %0"
296 : "=r" (ret)
297 : "r" (p)
298 : "memory");
299
300 return (ret ? 1 : 0);
301 }
302 #endif
303
304 #ifdef __arm__
305 #define HAVE_TEST_AND_SET 1
306 static inline int testandset(volatile int *p)
307 {
308 register unsigned int ret;
309 __asm__ __volatile__("swp %0, %1, [%2]"
310 : "=r"(ret)
311 : "0"(1), "r"(p));
312
313 return ret;
314 }
315 #endif
316
317 #endif /* __GNUC__ */
318
319 typedef volatile int spinlock_t;
320
321 static const spinlock_t SPIN_LOCK_UNLOCKED = 0;
322
323 #if HAVE_TEST_AND_SET
324 #define HAVE_SPINLOCKS 1
325 static inline void spin_lock(spinlock_t *lock)
326 {
327 while (testandset(lock));
328 }
329
330 static inline void spin_unlock(spinlock_t *lock)
331 {
332 *lock = 0;
333 }
334
335 static inline int spin_trylock(spinlock_t *lock)
336 {
337 return !testandset(lock);
338 }
339 #else
340 static inline void spin_lock(spinlock_t *lock)
341 {
342 }
343
344 static inline void spin_unlock(spinlock_t *lock)
345 {
346 }
347
348 static inline int spin_trylock(spinlock_t *lock)
349 {
350 return 1;
351 }
352 #endif
353
354 /* X11 display fast locks */
355 #ifdef HAVE_SPINLOCKS
356 #define X11_LOCK_TYPE spinlock_t
357 #define X11_LOCK_INIT SPIN_LOCK_UNLOCKED
358 #define XDisplayLock() spin_lock(&x_display_lock)
359 #define XDisplayUnlock() spin_unlock(&x_display_lock)
360 #elif defined(HAVE_PTHREADS)
361 #define X11_LOCK_TYPE pthread_mutex_t
362 #define X11_LOCK_INIT PTHREAD_MUTEX_INITIALIZER
363 #define XDisplayLock() pthread_mutex_lock(&x_display_lock);
364 #define XDisplayUnlock() pthread_mutex_unlock(&x_display_lock);
365 #else
366 #define XDisplayLock()
367 #define XDisplayUnlock()
368 #endif
369 #ifdef X11_LOCK_TYPE
370 extern X11_LOCK_TYPE x_display_lock;
371 #endif
372
373 #ifdef HAVE_PTHREADS
374 /* Centralized pthread attribute setup */
375 void Set_pthread_attr(pthread_attr_t *attr, int priority);
376 #endif
377
378 /* UAE CPU defines */
379 #ifdef WORDS_BIGENDIAN
380
381 #ifdef CPU_CAN_ACCESS_UNALIGNED
382
383 /* Big-endian CPUs which can do unaligned accesses */
384 static inline uae_u32 do_get_mem_long(uae_u32 *a) {return *a;}
385 static inline uae_u32 do_get_mem_word(uae_u16 *a) {return *a;}
386 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {*a = v;}
387 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {*a = v;}
388
389 #else /* CPU_CAN_ACCESS_UNALIGNED */
390
391 #ifdef sgi
392 /* The SGI MIPSPro compilers can do unaligned accesses given enough hints.
393 * They will automatically inline these routines. */
394 #ifdef __cplusplus
395 extern "C" { /* only the C compiler does unaligned accesses */
396 #endif
397 extern uae_u32 do_get_mem_long(uae_u32 *a);
398 extern uae_u32 do_get_mem_word(uae_u16 *a);
399 extern void do_put_mem_long(uae_u32 *a, uae_u32 v);
400 extern void do_put_mem_word(uae_u16 *a, uae_u32 v);
401 #ifdef __cplusplus
402 }
403 #endif
404
405 #else /* sgi */
406
407 /* Big-endian CPUs which can not do unaligned accesses (this is not the most efficient way to do this...) */
408 static inline uae_u32 do_get_mem_long(uae_u32 *a) {uint8 *b = (uint8 *)a; return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];}
409 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint8 *b = (uint8 *)a; return (b[0] << 8) | b[1];}
410 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {uint8 *b = (uint8 *)a; b[0] = v >> 24; b[1] = v >> 16; b[2] = v >> 8; b[3] = v;}
411 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {uint8 *b = (uint8 *)a; b[0] = v >> 8; b[1] = v;}
412 #endif /* sgi */
413
414 #endif /* CPU_CAN_ACCESS_UNALIGNED */
415
416 #else /* WORDS_BIGENDIAN */
417
418 #if defined(__i386__) || defined(__x86_64__)
419
420 /* Intel x86 */
421 #define X86_PPRO_OPT
422 static inline uae_u32 do_get_mem_long(uae_u32 *a) {uint32 retval; __asm__ ("bswap %0" : "=r" (retval) : "0" (*a) : "cc"); return retval;}
423 #ifdef X86_PPRO_OPT
424 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint32 retval; __asm__ ("movzwl %w1,%k0\n\tshll $16,%k0\n\tbswapl %k0\n" : "=&r" (retval) : "m" (*a) : "cc"); return retval;}
425 #else
426 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint32 retval; __asm__ ("xorl %k0,%k0\n\tmovw %w1,%w0\n\trolw $8,%w0" : "=&r" (retval) : "m" (*a) : "cc"); return retval;}
427 #endif
428 #define HAVE_GET_WORD_UNSWAPPED
429 #define do_get_mem_word_unswapped(a) ((uae_u32)*((uae_u16 *)(a)))
430 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {__asm__ ("bswap %0" : "=r" (v) : "0" (v) : "cc"); *a = v;}
431 #ifdef X86_PPRO_OPT
432 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {__asm__ ("bswapl %0" : "=&r" (v) : "0" (v << 16) : "cc"); *a = v;}
433 #else
434 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {__asm__ ("rolw $8,%0" : "=r" (v) : "0" (v) : "cc"); *a = v;}
435 #endif
436 #define HAVE_OPTIMIZED_BYTESWAP_32
437 /* bswap doesn't affect condition codes */
438 static inline uae_u32 do_byteswap_32(uae_u32 v) {__asm__ ("bswap %0" : "=r" (v) : "0" (v)); return v;}
439 #define HAVE_OPTIMIZED_BYTESWAP_16
440 #ifdef X86_PPRO_OPT
441 static inline uae_u32 do_byteswap_16(uae_u32 v) {__asm__ ("bswapl %0" : "=&r" (v) : "0" (v << 16) : "cc"); return v;}
442 #else
443 static inline uae_u32 do_byteswap_16(uae_u32 v) {__asm__ ("rolw $8,%0" : "=r" (v) : "0" (v) : "cc"); return v;}
444 #endif
445
446 #elif defined(CPU_CAN_ACCESS_UNALIGNED)
447
448 /* Other little-endian CPUs which can do unaligned accesses */
449 static inline uae_u32 do_get_mem_long(uae_u32 *a) {uint32 x = *a; return (x >> 24) | (x >> 8) & 0xff00 | (x << 8) & 0xff0000 | (x << 24);}
450 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint16 x = *a; return (x >> 8) | (x << 8);}
451 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {*a = (v >> 24) | (v >> 8) & 0xff00 | (v << 8) & 0xff0000 | (v << 24);}
452 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {*a = (v >> 8) | (v << 8);}
453
454 #else /* CPU_CAN_ACCESS_UNALIGNED */
455
456 /* Other little-endian CPUs which can not do unaligned accesses (this needs optimization) */
457 static inline uae_u32 do_get_mem_long(uae_u32 *a) {uint8 *b = (uint8 *)a; return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];}
458 static inline uae_u32 do_get_mem_word(uae_u16 *a) {uint8 *b = (uint8 *)a; return (b[0] << 8) | b[1];}
459 static inline void do_put_mem_long(uae_u32 *a, uae_u32 v) {uint8 *b = (uint8 *)a; b[0] = v >> 24; b[1] = v >> 16; b[2] = v >> 8; b[3] = v;}
460 static inline void do_put_mem_word(uae_u16 *a, uae_u32 v) {uint8 *b = (uint8 *)a; b[0] = v >> 8; b[1] = v;}
461
462 #endif /* CPU_CAN_ACCESS_UNALIGNED */
463
464 #endif /* WORDS_BIGENDIAN */
465
466 #ifndef HAVE_OPTIMIZED_BYTESWAP_32
467 static inline uae_u32 do_byteswap_32(uae_u32 v)
468 { return (((v >> 24) & 0xff) | ((v >> 8) & 0xff00) | ((v & 0xff) << 24) | ((v & 0xff00) << 8)); }
469 #endif
470
471 #ifndef HAVE_OPTIMIZED_BYTESWAP_16
472 static inline uae_u32 do_byteswap_16(uae_u32 v)
473 { return (((v >> 8) & 0xff) | ((v & 0xff) << 8)); }
474 #endif
475
476 #define do_get_mem_byte(a) ((uae_u32)*((uae_u8 *)(a)))
477 #define do_put_mem_byte(a, v) (*(uae_u8 *)(a) = (v))
478
479 #define call_mem_get_func(func, addr) ((*func)(addr))
480 #define call_mem_put_func(func, addr, v) ((*func)(addr, v))
481 #define __inline__ inline
482 #define CPU_EMU_SIZE 0
483 #undef NO_INLINE_MEMORY_ACCESS
484 #undef MD_HAVE_MEM_1_FUNCS
485 #define ENUMDECL typedef enum
486 #define ENUMNAME(name) name
487 #define write_log printf
488
489 #if defined(X86_ASSEMBLY) || defined(X86_64_ASSEMBLY)
490 #define ASM_SYM_FOR_FUNC(a) __asm__(a)
491 #else
492 #define ASM_SYM_FOR_FUNC(a)
493 #endif
494
495 #ifndef REGPARAM
496 # define REGPARAM
497 #endif
498 #define REGPARAM2
499
500 #endif