source: buchla-emu/emu/cpu.c@ 74c44d9

Last change on this file since 74c44d9 was 74c44d9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Fix first loaded byte.
  • Property mode set to 100644
File size: 15.9 KB
Line 
1/*
2 * Copyright (C) 2017 The Contributors
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or (at
7 * your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * A copy of the GNU General Public License can be found in the file
15 * "gpl.txt" in the top directory of this repository.
16 */
17
18#include <all.h>
19
20#define ver(...) _ver(cpu_verbose, 0, __VA_ARGS__)
21#define ver2(...) _ver(cpu_verbose, 1, __VA_ARGS__)
22#define ver3(...) _ver(cpu_verbose, 2, __VA_ARGS__)
23
24int32_t cpu_verbose = 0;
25
26#define CPU_FREQ 7000000
27#define PER_SEC 100000
28
29#define APP_START 0x10000
30
31#define RAM_START 0x0
32#define RAM_SIZE 0x100000
33
34#define ROM_START 0x100000
35#define ROM_SIZE 0x10000
36
37typedef void (*hw_init_t)(void);
38typedef void (*hw_quit_t)(void);
39typedef bool (*hw_exec_t)(void);
40typedef uint32_t (*hw_read_t)(uint32_t off, int32_t sz);
41typedef void (*hw_write_t)(uint32_t off, int32_t sz, uint32_t val);
42
43typedef struct {
44 uint32_t addr_beg;
45 uint32_t addr_end;
46 uint32_t irq;
47 hw_init_t init;
48 hw_quit_t quit;
49 hw_exec_t exec;
50 hw_read_t read;
51 hw_write_t write;
52} hw_t;
53
54static bool reset = true;
55
56static uint8_t ram_data[RAM_SIZE];
57static uint8_t rom_data[ROM_SIZE];
58
59static uint32_t ram_ro_beg = 0x1234;
60static uint32_t ram_ro_end = 0x1234;
61static uint32_t ram_rw_beg = 0x1234;
62static uint32_t ram_rw_end = 0x1234;
63
64static uint32_t rom_ro_beg;
65static uint32_t rom_ro_end;
66static uint32_t rom_rw_beg;
67static uint32_t rom_rw_end;
68
69static hw_t hw_map[] = {
70 { 0x180000, 0x200000, 0, fpu_init, fpu_quit, fpu_exec, fpu_read, fpu_write },
71 { 0x200000, 0x280000, 0, vid_init, vid_quit, vid_exec, vid_read, vid_write },
72 { 0x3a0001, 0x3a4001, 0, tim_init, tim_quit, tim_exec, tim_read, tim_write },
73 { 0x3a4001, 0x3a8001, 0, lcd_init, lcd_quit, lcd_exec, lcd_read, lcd_write },
74 { 0x3a8001, 0x3ac001, 5, ser_init, ser_quit, ser_exec, ser_read, ser_write },
75 { 0x3ac001, 0x3b0001, 0, mid_init, mid_quit, mid_exec, mid_read, mid_write },
76 { 0x3b0001, 0x3b4001, 0, fdd_init, fdd_quit, fdd_exec, fdd_read, fdd_write },
77 { 0x3b4001, 0x3b8001, 0, snd_init, snd_quit, snd_exec, snd_read, snd_write },
78 { 0x3b8001, 0x3bc001, 0, led_init, led_quit, led_exec, led_read, led_write },
79 { 0x3bc001, 0x3c0001, 0, kbd_init, kbd_quit, kbd_exec, kbd_read, kbd_write }
80};
81
82static hw_t *hw_by_addr(uint32_t addr)
83{
84 for (int32_t i = 0; i < ARRAY_COUNT(hw_map); ++i) {
85 if (addr >= hw_map[i].addr_beg && addr < hw_map[i].addr_end) {
86 return hw_map + i;
87 }
88 }
89
90 return NULL;
91}
92
93static void hw_init(void)
94{
95 inf("starting hardware");
96
97 for (int32_t i = 0; i < ARRAY_COUNT(hw_map); ++i) {
98 hw_map[i].init();
99 }
100}
101
102static void hw_quit(void)
103{
104 inf("halting hardware");
105
106 for (int32_t i = 0; i < ARRAY_COUNT(hw_map); ++i) {
107 hw_map[i].quit();
108 }
109}
110
111static uint32_t hw_exec(void)
112{
113 uint32_t irq = 0;
114
115 for (int32_t i = 0; i < ARRAY_COUNT(hw_map); ++i) {
116 if (hw_map[i].exec() && hw_map[i].irq > irq) {
117 irq = hw_map[i].irq;
118 }
119 }
120
121 return irq;
122}
123
124static uint32_t hw_off(hw_t *hw, uint32_t addr)
125{
126 if ((hw->addr_beg & 0x1) == 0) {
127 return addr - hw->addr_beg;
128 }
129
130 return (addr - hw->addr_beg) / 2;
131}
132
133static void bios_init(void)
134{
135 inf("loading BIOS file %s", bios);
136
137 SDL_RWops *ops = SDL_RWFromFile(bios, "rb");
138
139 if (ops == NULL) {
140 fail("error while opening BIOS file %s", bios);
141 }
142
143 if (SDL_ReadBE16(ops) != 0x601b) {
144 fail("invalid BIOS file %s", bios);
145 }
146
147 uint32_t text_len = SDL_ReadBE32(ops);
148 uint32_t data_len = SDL_ReadBE32(ops);
149 uint32_t bss_len = SDL_ReadBE32(ops);
150
151 SDL_ReadBE32(ops);
152 SDL_ReadBE32(ops);
153
154 uint32_t text_loc = SDL_ReadBE32(ops);
155
156 SDL_ReadBE16(ops);
157
158 uint32_t data_loc = SDL_ReadBE32(ops);
159 uint32_t bss_loc = SDL_ReadBE32(ops);
160
161 inf("BIOS text 0x%x:0x%x data 0x%x:0x%x bss 0x%x:0x%x",
162 text_loc, text_len, data_loc, data_len, bss_loc, bss_len);
163
164 size_t load_len = (size_t)SDL_RWsize(ops) - 36;
165
166 if (text_loc != ROM_START || text_loc + text_len != data_loc ||
167 load_len != text_len + data_len || load_len > ROM_SIZE) {
168 fail("invalid BIOS file %s", bios);
169 }
170
171 size_t loaded = 0;
172
173 while (loaded < load_len) {
174 size_t n_rd = SDL_RWread(ops, rom_data + loaded, 1, load_len - loaded);
175
176 if (n_rd == 0) {
177 fail("error while reading BIOS file %s", bios);
178 }
179
180 loaded += n_rd;
181 }
182
183 SDL_RWclose(ops);
184
185 rom_ro_beg = text_loc;
186 rom_ro_end = text_loc + text_len + data_len;
187 rom_rw_beg = bss_loc;
188 rom_rw_end = bss_loc + bss_len;
189
190 ver("rom_ro_beg 0x%08x rom_ro_end 0x%08x", rom_ro_beg, rom_ro_end);
191 ver("rom_rw_beg 0x%08x rom_rw_end 0x%08x", rom_rw_beg, rom_rw_end);
192}
193
194uint32_t m68k_read_disassembler_8(uint32_t addr)
195{
196 return m68k_read_memory_8(addr);
197}
198
199uint32_t m68k_read_disassembler_16(uint32_t addr)
200{
201 return m68k_read_memory_16(addr);
202}
203
204uint32_t m68k_read_disassembler_32(uint32_t addr)
205{
206 return m68k_read_memory_32(addr);
207}
208
209uint32_t m68k_read_memory_8(uint32_t addr)
210{
211 ver3("mem rd 0x%08x:8", addr);
212
213 if (addr >= ram_ro_beg && addr <= ram_ro_end - 1) {
214 return ram_data[addr - RAM_START];
215 }
216
217 if (addr >= ram_rw_beg && addr <= ram_rw_end - 1) {
218 return ram_data[addr - RAM_START];
219 }
220
221 if (addr >= rom_ro_beg && addr <= rom_ro_end - 1) {
222 return rom_data[addr - ROM_START];
223 }
224
225 if (addr >= rom_rw_beg && addr <= rom_rw_end - 1) {
226 // ROM has its BSS section in RAM.
227 return ram_data[addr - RAM_START];
228 }
229
230 hw_t *hw = hw_by_addr(addr);
231
232 if (hw != NULL) {
233 return hw->read(hw_off(hw, addr), 1);
234 }
235
236 if (addr <= APP_START - 1) {
237 return ram_data[addr];
238 }
239
240 fail("invalid read 0x%08x:8", addr);
241}
242
243uint32_t m68k_read_memory_16(uint32_t addr)
244{
245 ver3("mem rd 0x%08x:16", addr);
246
247 if (addr >= ram_ro_beg && addr <= ram_ro_end - 2) {
248 return
249 ((uint32_t)ram_data[addr - RAM_START + 0] << 8) |
250 ((uint32_t)ram_data[addr - RAM_START + 1] << 0);
251 }
252
253 if (addr >= ram_rw_beg && addr <= ram_rw_end - 2) {
254 return
255 ((uint32_t)ram_data[addr - RAM_START + 0] << 8) |
256 ((uint32_t)ram_data[addr - RAM_START + 1] << 0);
257 }
258
259 if (addr >= rom_ro_beg && addr <= rom_ro_end - 2) {
260 return
261 ((uint32_t)rom_data[addr - ROM_START + 0] << 8) |
262 ((uint32_t)rom_data[addr - ROM_START + 1] << 0);
263 }
264
265 if (addr >= rom_rw_beg && addr <= rom_rw_end - 2) {
266 // ROM has its BSS section in RAM.
267 return
268 ((uint32_t)ram_data[addr - RAM_START + 0] << 8) |
269 ((uint32_t)ram_data[addr - RAM_START + 1] << 0);
270 }
271
272 hw_t *hw = hw_by_addr(addr);
273
274 if (hw != NULL) {
275 return hw->read(hw_off(hw, addr), 2);
276 }
277
278 if (addr <= APP_START - 2) {
279 return
280 ((uint32_t)ram_data[addr + 0] << 8) |
281 ((uint32_t)ram_data[addr + 1] << 0);
282 }
283
284 fail("invalid read 0x%08x:16", addr);
285}
286
287uint32_t m68k_read_memory_32(uint32_t addr)
288{
289 ver3("mem rd 0x%08x:32", addr);
290
291 if (reset) {
292 if (addr == 0) {
293 addr += ROM_START;
294 }
295 else if (addr == 4) {
296 addr += ROM_START;
297 reset = false;
298 }
299 else {
300 fail("invalid reset sequence");
301 }
302 }
303
304 if (addr >= ram_ro_beg && addr <= ram_ro_end - 4) {
305 return
306 ((uint32_t)ram_data[addr - RAM_START + 0] << 24) |
307 ((uint32_t)ram_data[addr - RAM_START + 1] << 16) |
308 ((uint32_t)ram_data[addr - RAM_START + 2] << 8) |
309 ((uint32_t)ram_data[addr - RAM_START + 3] << 0);
310 }
311
312 if (addr >= ram_rw_beg && addr <= ram_rw_end - 4) {
313 return
314 ((uint32_t)ram_data[addr - RAM_START + 0] << 24) |
315 ((uint32_t)ram_data[addr - RAM_START + 1] << 16) |
316 ((uint32_t)ram_data[addr - RAM_START + 2] << 8) |
317 ((uint32_t)ram_data[addr - RAM_START + 3] << 0);
318 }
319
320 if (addr >= rom_ro_beg && addr <= rom_ro_end - 4) {
321 return
322 ((uint32_t)rom_data[addr - ROM_START + 0] << 24) |
323 ((uint32_t)rom_data[addr - ROM_START + 1] << 16) |
324 ((uint32_t)rom_data[addr - ROM_START + 2] << 8) |
325 ((uint32_t)rom_data[addr - ROM_START + 3] << 0);
326 }
327
328 if (addr >= rom_rw_beg && addr <= rom_rw_end - 4) {
329 // ROM has its BSS section in RAM.
330 return
331 ((uint32_t)ram_data[addr - RAM_START + 0] << 24) |
332 ((uint32_t)ram_data[addr - RAM_START + 1] << 16) |
333 ((uint32_t)ram_data[addr - RAM_START + 2] << 8) |
334 ((uint32_t)ram_data[addr - RAM_START + 3] << 0);
335 }
336
337 hw_t *hw = hw_by_addr(addr);
338
339 if (hw != NULL) {
340 return hw->read(hw_off(hw, addr), 4);
341 }
342
343 if (addr <= APP_START - 4) {
344 return
345 ((uint32_t)ram_data[addr + 0] << 24) |
346 ((uint32_t)ram_data[addr + 1] << 16) |
347 ((uint32_t)ram_data[addr + 2] << 8) |
348 ((uint32_t)ram_data[addr + 3] << 0);
349 }
350
351 fail("invalid read 0x%08x:32", addr);
352}
353
354void m68k_write_memory_8(uint32_t addr, uint32_t val)
355{
356 ver3("mem wr 0x%08x:8 0x%02x", addr, val);
357
358 if (addr >= ram_rw_beg && addr <= ram_rw_end - 1) {
359 ram_data[addr - RAM_START] = (uint8_t)val;
360 return;
361 }
362
363 if (addr >= rom_rw_beg && addr <= rom_rw_end - 1) {
364 // ROM has its BSS section in RAM.
365 ram_data[addr - RAM_START] = (uint8_t)val;
366 return;
367 }
368
369 hw_t *hw = hw_by_addr(addr);
370
371 if (hw != NULL) {
372 hw->write(hw_off(hw, addr), 1, val);
373 return;
374 }
375
376 if (addr <= APP_START - 1) {
377 ram_data[addr] = (uint8_t)val;
378 return;
379 }
380
381 // once midas.abs gets loaded, activate RAM
382
383 if (addr == APP_START) {
384 ram_data[addr] = (uint8_t)val;
385 ram_rw_beg = APP_START;
386 ram_rw_end = RAM_START + RAM_SIZE;
387 return;
388 }
389
390 fail("invalid write 0x%08x:8 0x%02x", addr, val);
391}
392
393void m68k_write_memory_16(uint32_t addr, uint32_t val)
394{
395 ver3("mem wr 0x%08x:16 0x%04x", addr, val);
396
397 if (addr >= ram_rw_beg && addr <= ram_rw_end - 2) {
398 ram_data[addr - RAM_START + 0] = (uint8_t)(val >> 8);
399 ram_data[addr - RAM_START + 1] = (uint8_t)(val >> 0);
400 return;
401 }
402
403 if (addr >= rom_rw_beg && addr <= rom_rw_end - 2) {
404 // ROM has its BSS section in RAM.
405 ram_data[addr - RAM_START + 0] = (uint8_t)(val >> 8);
406 ram_data[addr - RAM_START + 1] = (uint8_t)(val >> 0);
407 return;
408 }
409
410 hw_t *hw = hw_by_addr(addr);
411
412 if (hw != NULL) {
413 hw->write(hw_off(hw, addr), 2, val);
414 return;
415 }
416
417 if (addr <= APP_START - 2) {
418 ram_data[addr + 0] = (uint8_t)(val >> 8);
419 ram_data[addr + 1] = (uint8_t)(val >> 0);
420 return;
421 }
422
423 fail("invalid write 0x%08x:16 0x%04x", addr, val);
424}
425
426void m68k_write_memory_32(uint32_t addr, uint32_t val)
427{
428 ver3("mem wr 0x%08x:32 0x%08x", addr, val);
429
430 if (addr >= ram_rw_beg && addr <= ram_rw_end - 4) {
431 ram_data[addr - RAM_START + 0] = (uint8_t)(val >> 24);
432 ram_data[addr - RAM_START + 1] = (uint8_t)(val >> 16);
433 ram_data[addr - RAM_START + 2] = (uint8_t)(val >> 8);
434 ram_data[addr - RAM_START + 3] = (uint8_t)(val >> 0);
435 return;
436 }
437
438 if (addr >= rom_rw_beg && addr <= rom_rw_end - 4) {
439 // ROM has its BSS section in RAM.
440 ram_data[addr - RAM_START + 0] = (uint8_t)(val >> 24);
441 ram_data[addr - RAM_START + 1] = (uint8_t)(val >> 16);
442 ram_data[addr - RAM_START + 2] = (uint8_t)(val >> 8);
443 ram_data[addr - RAM_START + 3] = (uint8_t)(val >> 0);
444 return;
445 }
446
447 hw_t *hw = hw_by_addr(addr);
448
449 if (hw != NULL) {
450 hw->write(hw_off(hw, addr), 4, val);
451 return;
452 }
453
454 if (addr <= APP_START - 4) {
455 ram_data[addr + 0] = (uint8_t)(val >> 24);
456 ram_data[addr + 1] = (uint8_t)(val >> 16);
457 ram_data[addr + 2] = (uint8_t)(val >> 8);
458 ram_data[addr + 3] = (uint8_t)(val >> 0);
459 return;
460 }
461
462 fail("invalid write 0x%08x:32 0x%08x", addr, val);
463}
464
465static void inst_cb(void)
466{
467 uint32_t pc = m68k_get_reg(NULL, M68K_REG_PC);
468 uint32_t op = m68k_read_memory_16(pc);
469
470 if (op == 0x4e4d) {
471 uint32_t sp = m68k_get_reg(NULL, M68K_REG_SP);
472 uint32_t fun = m68k_read_memory_16(sp);
473
474 switch (fun) {
475 case 1:
476 ver2("BIOS B_RDAV %u", m68k_read_memory_16(sp + 2));
477 break;
478
479 case 2:
480 ver2("BIOS B_GETC %u", m68k_read_memory_16(sp + 2));
481 break;
482
483 case 3:
484 ver2("BIOS B_PUTC %u %u",
485 m68k_read_memory_16(sp + 2),
486 m68k_read_memory_16(sp + 4));
487 break;
488
489 case 4:
490 ver2("BIOS B_RDWR %u 0x%08x %u %u %u",
491 m68k_read_memory_16(sp + 2),
492 m68k_read_memory_32(sp + 4),
493 m68k_read_memory_16(sp + 8),
494 m68k_read_memory_16(sp + 10),
495 m68k_read_memory_16(sp + 12));
496 break;
497
498 case 5:
499 ver2("BIOS B_SETV %u 0x%08x",
500 m68k_read_memory_16(sp + 2),
501 m68k_read_memory_32(sp + 4));
502 break;
503
504 case 7:
505 ver2("BIOS B_GBPB %u", m68k_read_memory_16(sp + 2));
506 break;
507
508 case 8:
509 ver2("BIOS B_THRE %u", m68k_read_memory_16(sp + 2));
510 break;
511
512 case 9:
513 ver2("BIOS B_MCHG %u", m68k_read_memory_16(sp + 2));
514 break;
515
516 case 10:
517 ver2("BIOS B_DMAP");
518 break;
519
520 default:
521 fail("invalid function: BIOS %d", fun);
522 }
523 }
524 else if (op == 0x4e4e) {
525 uint32_t sp = m68k_get_reg(NULL, M68K_REG_SP);
526 uint32_t fun = m68k_read_memory_16(sp);
527
528 switch (fun) {
529 case 0:
530 ver2("XBIOS X_PIOREC %u", m68k_read_memory_16(sp + 2));
531 break;
532
533 case 1:
534 ver2("XBIOS X_SETPRT %u 0x%02x 0x%02x 0x%02x 0x%02x",
535 m68k_read_memory_16(sp + 2),
536 m68k_read_memory_16(sp + 4),
537 m68k_read_memory_16(sp + 6),
538 m68k_read_memory_16(sp + 8),
539 m68k_read_memory_16(sp + 10));
540 break;
541
542 case 2:
543 ver2("XBIOS X_FLOPRD 0x%08x 0x%08x %u %u %u %u %u",
544 m68k_read_memory_32(sp + 2),
545 m68k_read_memory_32(sp + 6),
546 m68k_read_memory_16(sp + 10),
547 m68k_read_memory_16(sp + 12),
548 m68k_read_memory_16(sp + 14),
549 m68k_read_memory_16(sp + 16),
550 m68k_read_memory_16(sp + 18));
551 break;
552
553 case 3:
554 ver2("XBIOS X_FLOPWR 0x%08x 0x%08x %u %u %u %u %u",
555 m68k_read_memory_32(sp + 2),
556 m68k_read_memory_32(sp + 6),
557 m68k_read_memory_16(sp + 10),
558 m68k_read_memory_16(sp + 12),
559 m68k_read_memory_16(sp + 14),
560 m68k_read_memory_16(sp + 16),
561 m68k_read_memory_16(sp + 18));
562 break;
563
564 case 4:
565 ver2("XBIOS X_FORMAT 0x%08x 0x%08x %u %u %u %u %u 0x%08x %u",
566 m68k_read_memory_32(sp + 2),
567 m68k_read_memory_32(sp + 6),
568 m68k_read_memory_16(sp + 10),
569 m68k_read_memory_16(sp + 12),
570 m68k_read_memory_16(sp + 14),
571 m68k_read_memory_16(sp + 16),
572 m68k_read_memory_16(sp + 18),
573 m68k_read_memory_32(sp + 20),
574 m68k_read_memory_16(sp + 24));
575 break;
576
577 case 5:
578 ver2("XBIOS X_VERIFY 0x%08x 0x%08x %u %u %u %u %u",
579 m68k_read_memory_32(sp + 2),
580 m68k_read_memory_32(sp + 6),
581 m68k_read_memory_16(sp + 10),
582 m68k_read_memory_16(sp + 12),
583 m68k_read_memory_16(sp + 14),
584 m68k_read_memory_16(sp + 16),
585 m68k_read_memory_16(sp + 18));
586 break;
587
588 case 6:
589 ver2("XBIOS X_PRBOOT 0x%08x %u %u %u",
590 m68k_read_memory_32(sp + 2),
591 m68k_read_memory_16(sp + 6),
592 m68k_read_memory_16(sp + 8),
593 m68k_read_memory_16(sp + 10));
594 break;
595
596 case 7:
597 ver2("XBIOS X_RANDOM");
598 break;
599
600 case 8:
601 ver2("XBIOS X_ANALOG");
602 break;
603
604 case 9:
605 ver2("XBIOS X_CLRAFI");
606 break;
607
608 case 10:
609 ver2("XBIOS X_APICHK");
610 break;
611
612 case 11:
613 ver2("XBIOS X_MTDEFS ");
614 break;
615
616 default:
617 fail("invalid function: XBIOS %d", fun);
618 }
619 }
620}
621
622void cpu_loop(void)
623{
624 hw_init();
625 bios_init();
626
627 inf("entering CPU loop");
628 m68k_init();
629 m68k_set_cpu_type(M68K_CPU_TYPE_68000);
630 m68k_set_instr_hook_callback(inst_cb);
631 m68k_pulse_reset();
632
633 uint64_t freq = SDL_GetPerformanceFrequency();
634 uint64_t quan = freq / PER_SEC;
635 inf("freq %" PRIu64 " quan %" PRIu64, freq, quan);
636
637 bool run = true;
638
639#if defined EMU_LINUX
640 SDL_Scancode down = SDL_SCANCODE_UNKNOWN;
641#endif
642
643 while (run) {
644 uint64_t until = SDL_GetPerformanceCounter() + quan;
645
646 m68k_execute(CPU_FREQ / PER_SEC);
647 uint32_t irq = hw_exec();
648
649 if (irq > 0) {
650 ver2("irq %u", irq);
651 }
652
653 m68k_set_irq(irq);
654
655 SDL_Event ev;
656
657 while (SDL_PollEvent(&ev) > 0) {
658#if defined EMU_LINUX
659 // Work around duplicate key-down events on Linux.
660
661 if (ev.type == SDL_KEYDOWN) {
662 if (down == ev.key.keysym.scancode) {
663 continue;
664 }
665
666 down = ev.key.keysym.scancode;
667 }
668 else if (ev.type == SDL_KEYUP) {
669 down = SDL_SCANCODE_UNKNOWN;
670 }
671#endif
672
673 if (ev.type == SDL_QUIT ||
674 (ev.type == SDL_KEYDOWN && ev.key.keysym.sym == SDLK_ESCAPE)) {
675 run = false;
676 continue;
677 }
678
679 if (ev.type == SDL_TEXTINPUT) {
680 ser_text(&ev.text);
681 continue;
682 }
683
684 if (ev.type == SDL_KEYDOWN) {
685 ser_key(&ev.key);
686 continue;
687 }
688 }
689
690 while (SDL_GetPerformanceCounter() < until) {
691 _mm_pause();
692 }
693 }
694
695 inf("leaving CPU loop");
696 hw_quit();
697}
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