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da673940 JG |
1 | /* |
2 | * Copyright (c) 2007 The DragonFly Project. All rights reserved. | |
3 | * | |
4 | * This code is derived from software contributed to The DragonFly Project | |
5 | * by Matthew Dillon <dillon@backplane.com> | |
6 | * | |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in | |
15 | * the documentation and/or other materials provided with the | |
16 | * distribution. | |
17 | * 3. Neither the name of The DragonFly Project nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific, prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT | |
31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
32 | * SUCH DAMAGE. | |
da673940 JG |
33 | */ |
34 | ||
da82a65a | 35 | #include <sys/cpumask.h> |
da673940 JG |
36 | #include <sys/interrupt.h> |
37 | #include <sys/kernel.h> | |
4499490f | 38 | #include <sys/malloc.h> |
da673940 JG |
39 | #include <sys/memrange.h> |
40 | #include <sys/tls.h> | |
41 | #include <sys/types.h> | |
42 | ||
43 | #include <vm/vm_extern.h> | |
44 | #include <vm/vm_kern.h> | |
45 | #include <vm/vm_object.h> | |
46 | #include <vm/vm_page.h> | |
47 | ||
0e6594a8 | 48 | #include <sys/mplock2.h> |
fcf6efef | 49 | #include <sys/thread2.h> |
0e6594a8 | 50 | |
da673940 JG |
51 | #include <machine/cpu.h> |
52 | #include <machine/cpufunc.h> | |
53 | #include <machine/globaldata.h> | |
54 | #include <machine/md_var.h> | |
55 | #include <machine/pmap.h> | |
56 | #include <machine/smp.h> | |
57 | #include <machine/tls.h> | |
a86ce0cd | 58 | #include <machine/param.h> |
da673940 JG |
59 | |
60 | #include <unistd.h> | |
61 | #include <pthread.h> | |
62 | #include <signal.h> | |
63 | #include <stdio.h> | |
64 | ||
65 | extern pt_entry_t *KPTphys; | |
66 | ||
da23a592 | 67 | volatile cpumask_t stopped_cpus; |
1ad93419 NA |
68 | /* which cpus are ready for IPIs etc? */ |
69 | cpumask_t smp_active_mask = CPUMASK_INITIALIZER_ONLYONE; | |
da673940 | 70 | static int boot_address; |
1ad93419 NA |
71 | /* which cpus have been started */ |
72 | static cpumask_t smp_startup_mask = CPUMASK_INITIALIZER_ONLYONE; | |
da673940 JG |
73 | static int mp_finish; |
74 | ||
9bea6114 MC |
75 | /* Local data for detecting CPU TOPOLOGY */ |
76 | static int core_bits = 0; | |
77 | static int logical_CPU_bits = 0; | |
78 | ||
da673940 JG |
79 | /* function prototypes XXX these should go elsewhere */ |
80 | void bootstrap_idle(void); | |
81 | void single_cpu_ipi(int, int, int); | |
da23a592 | 82 | void selected_cpu_ipi(cpumask_t, int, int); |
da673940 JG |
83 | #if 0 |
84 | void ipi_handler(int); | |
85 | #endif | |
86 | ||
87 | pt_entry_t *SMPpt; | |
88 | ||
89 | /* AP uses this during bootstrap. Do not staticize. */ | |
90 | char *bootSTK; | |
91 | static int bootAP; | |
92 | ||
93 | ||
94 | /* XXX these need to go into the appropriate header file */ | |
95 | static int start_all_aps(u_int); | |
96 | void init_secondary(void); | |
97 | void *start_ap(void *); | |
98 | ||
99 | /* | |
100 | * Get SMP fully working before we start initializing devices. | |
101 | */ | |
102 | static | |
103 | void | |
104 | ap_finish(void) | |
105 | { | |
da673940 JG |
106 | mp_finish = 1; |
107 | if (bootverbose) | |
108 | kprintf("Finish MP startup\n"); | |
109 | ||
110 | /* build our map of 'other' CPUs */ | |
c07315c4 MD |
111 | mycpu->gd_other_cpus = smp_startup_mask; |
112 | CPUMASK_NANDBIT(mycpu->gd_other_cpus, mycpu->gd_cpuid); | |
da673940 JG |
113 | |
114 | /* | |
115 | * Let the other cpu's finish initializing and build their map | |
116 | * of 'other' CPUs. | |
117 | */ | |
118 | rel_mplock(); | |
1ad93419 | 119 | while (CPUMASK_CMPMASKNEQ(smp_active_mask,smp_startup_mask)) { |
da673940 JG |
120 | DELAY(100000); |
121 | cpu_lfence(); | |
122 | } | |
123 | ||
124 | while (try_mplock() == 0) | |
125 | DELAY(100000); | |
126 | if (bootverbose) | |
739d9bd3 MD |
127 | kprintf("Active CPU Mask: %08lx\n", |
128 | (long)CPUMASK_LOWMASK(smp_active_mask)); | |
da673940 JG |
129 | } |
130 | ||
f3f3eadb | 131 | SYSINIT(finishsmp, SI_BOOT2_FINISH_SMP, SI_ORDER_FIRST, ap_finish, NULL); |
da673940 | 132 | |
da673940 JG |
133 | void * |
134 | start_ap(void *arg __unused) | |
135 | { | |
136 | init_secondary(); | |
137 | setrealcpu(); | |
138 | bootstrap_idle(); | |
139 | ||
140 | return(NULL); /* NOTREACHED */ | |
141 | } | |
142 | ||
143 | /* storage for AP thread IDs */ | |
144 | pthread_t ap_tids[MAXCPU]; | |
145 | ||
c91894e0 MD |
146 | int naps; |
147 | ||
da673940 JG |
148 | void |
149 | mp_start(void) | |
150 | { | |
1997b4c2 | 151 | size_t ipiq_size; |
da673940 | 152 | int shift; |
1997b4c2 | 153 | |
da673940 | 154 | ncpus = optcpus; |
c91894e0 | 155 | naps = ncpus - 1; |
da673940 | 156 | |
da673940 JG |
157 | for (shift = 0; (1 << shift) <= ncpus; ++shift) |
158 | ; | |
159 | --shift; | |
da673940 JG |
160 | |
161 | /* ncpus_fit -- ncpus rounded up to the nearest power of 2 */ | |
162 | if ((1 << shift) < ncpus) | |
163 | ++shift; | |
164 | ncpus_fit = 1 << shift; | |
165 | ncpus_fit_mask = ncpus_fit - 1; | |
166 | ||
3ab3ae18 MD |
167 | malloc_reinit_ncpus(); |
168 | ||
da673940 JG |
169 | /* |
170 | * cpu0 initialization | |
171 | */ | |
1997b4c2 | 172 | ipiq_size = sizeof(struct lwkt_ipiq) * ncpus; |
1eeaf6b2 | 173 | mycpu->gd_ipiq = (void *)kmem_alloc(kernel_map, ipiq_size, |
3091de50 | 174 | VM_SUBSYS_IPIQ); |
1997b4c2 | 175 | bzero(mycpu->gd_ipiq, ipiq_size); |
da673940 | 176 | |
cc3685b0 SZ |
177 | /* initialize arc4random. */ |
178 | arc4_init_pcpu(0); | |
179 | ||
da673940 JG |
180 | /* |
181 | * cpu 1-(n-1) | |
182 | */ | |
183 | start_all_aps(boot_address); | |
184 | ||
185 | } | |
186 | ||
187 | void | |
188 | mp_announce(void) | |
189 | { | |
190 | int x; | |
191 | ||
192 | kprintf("DragonFly/MP: Multiprocessor\n"); | |
193 | kprintf(" cpu0 (BSP)\n"); | |
194 | ||
c91894e0 | 195 | for (x = 1; x <= naps; ++x) |
da673940 JG |
196 | kprintf(" cpu%d (AP)\n", x); |
197 | } | |
198 | ||
da673940 JG |
199 | void |
200 | cpu_send_ipiq(int dcpu) | |
201 | { | |
c07315c4 | 202 | if (CPUMASK_TESTBIT(smp_active_mask, dcpu)) { |
da673940 JG |
203 | if (pthread_kill(ap_tids[dcpu], SIGUSR1) != 0) |
204 | panic("pthread_kill failed in cpu_send_ipiq"); | |
da0b0e8b | 205 | } |
da673940 JG |
206 | #if 0 |
207 | panic("XXX cpu_send_ipiq()"); | |
208 | #endif | |
209 | } | |
210 | ||
da673940 JG |
211 | void |
212 | single_cpu_ipi(int cpu, int vector, int delivery_mode) | |
213 | { | |
214 | kprintf("XXX single_cpu_ipi\n"); | |
215 | } | |
216 | ||
217 | void | |
da23a592 | 218 | selected_cpu_ipi(cpumask_t target, int vector, int delivery_mode) |
da673940 JG |
219 | { |
220 | crit_enter(); | |
c07315c4 | 221 | while (CPUMASK_TESTNZERO(target)) { |
da23a592 | 222 | int n = BSFCPUMASK(target); |
c07315c4 | 223 | CPUMASK_NANDBIT(target, n); |
da673940 JG |
224 | single_cpu_ipi(n, vector, delivery_mode); |
225 | } | |
226 | crit_exit(); | |
227 | } | |
228 | ||
229 | int | |
da23a592 | 230 | stop_cpus(cpumask_t map) |
da673940 | 231 | { |
c07315c4 | 232 | CPUMASK_ANDMASK(map, smp_active_mask); |
da673940 JG |
233 | |
234 | crit_enter(); | |
c07315c4 | 235 | while (CPUMASK_TESTNZERO(map)) { |
da23a592 | 236 | int n = BSFCPUMASK(map); |
c07315c4 MD |
237 | CPUMASK_NANDBIT(map, n); |
238 | ATOMIC_CPUMASK_ORBIT(stopped_cpus, n); | |
da673940 JG |
239 | if (pthread_kill(ap_tids[n], SIGXCPU) != 0) |
240 | panic("stop_cpus: pthread_kill failed"); | |
241 | } | |
242 | crit_exit(); | |
243 | #if 0 | |
244 | panic("XXX stop_cpus()"); | |
245 | #endif | |
246 | ||
247 | return(1); | |
248 | } | |
249 | ||
250 | int | |
da23a592 | 251 | restart_cpus(cpumask_t map) |
da673940 | 252 | { |
c07315c4 | 253 | CPUMASK_ANDMASK(map, smp_active_mask); |
da673940 JG |
254 | |
255 | crit_enter(); | |
c07315c4 | 256 | while (CPUMASK_TESTNZERO(map)) { |
da23a592 | 257 | int n = BSFCPUMASK(map); |
c07315c4 MD |
258 | CPUMASK_NANDBIT(map, n); |
259 | ATOMIC_CPUMASK_NANDBIT(stopped_cpus, n); | |
da673940 JG |
260 | if (pthread_kill(ap_tids[n], SIGXCPU) != 0) |
261 | panic("restart_cpus: pthread_kill failed"); | |
262 | } | |
263 | crit_exit(); | |
264 | #if 0 | |
265 | panic("XXX restart_cpus()"); | |
266 | #endif | |
267 | ||
268 | return(1); | |
269 | } | |
da673940 JG |
270 | void |
271 | ap_init(void) | |
272 | { | |
273 | /* | |
274 | * Adjust smp_startup_mask to signal the BSP that we have started | |
275 | * up successfully. Note that we do not yet hold the BGL. The BSP | |
276 | * is waiting for our signal. | |
277 | * | |
278 | * We can't set our bit in smp_active_mask yet because we are holding | |
279 | * interrupts physically disabled and remote cpus could deadlock | |
280 | * trying to send us an IPI. | |
281 | */ | |
c07315c4 | 282 | ATOMIC_CPUMASK_ORBIT(smp_startup_mask, mycpu->gd_cpuid); |
da673940 JG |
283 | cpu_mfence(); |
284 | ||
285 | /* | |
286 | * Interlock for finalization. Wait until mp_finish is non-zero, | |
287 | * then get the MP lock. | |
288 | * | |
289 | * Note: We are in a critical section. | |
290 | * | |
da673940 JG |
291 | * Note: we are the idle thread, we can only spin. |
292 | * | |
293 | * Note: The load fence is memory volatile and prevents the compiler | |
294 | * from improperly caching mp_finish, and the cpu from improperly | |
295 | * caching it. | |
296 | */ | |
297 | ||
298 | while (mp_finish == 0) { | |
299 | cpu_lfence(); | |
300 | DELAY(500000); | |
301 | } | |
b5d16701 | 302 | while (try_mplock() == 0) |
da673940 JG |
303 | DELAY(100000); |
304 | ||
305 | /* BSP may have changed PTD while we're waiting for the lock */ | |
306 | cpu_invltlb(); | |
307 | ||
308 | /* Build our map of 'other' CPUs. */ | |
c07315c4 MD |
309 | mycpu->gd_other_cpus = smp_startup_mask; |
310 | CPUMASK_NANDBIT(mycpu->gd_other_cpus, mycpu->gd_cpuid); | |
da673940 JG |
311 | |
312 | kprintf("SMP: AP CPU #%d Launched!\n", mycpu->gd_cpuid); | |
313 | ||
314 | ||
315 | /* Set memory range attributes for this CPU to match the BSP */ | |
316 | mem_range_AP_init(); | |
317 | /* | |
318 | * Once we go active we must process any IPIQ messages that may | |
319 | * have been queued, because no actual IPI will occur until we | |
320 | * set our bit in the smp_active_mask. If we don't the IPI | |
321 | * message interlock could be left set which would also prevent | |
322 | * further IPIs. | |
323 | * | |
324 | * The idle loop doesn't expect the BGL to be held and while | |
325 | * lwkt_switch() normally cleans things up this is a special case | |
326 | * because we returning almost directly into the idle loop. | |
327 | * | |
328 | * The idle thread is never placed on the runq, make sure | |
329 | * nothing we've done put it there. | |
330 | */ | |
b5d16701 | 331 | KKASSERT(get_mplock_count(curthread) == 1); |
c07315c4 | 332 | ATOMIC_CPUMASK_ORBIT(smp_active_mask, mycpu->gd_cpuid); |
da673940 JG |
333 | |
334 | mdcpu->gd_fpending = 0; | |
335 | mdcpu->gd_ipending = 0; | |
336 | initclocks_pcpu(); /* clock interrupts (via IPIs) */ | |
4dd1b994 AHJ |
337 | |
338 | /* | |
339 | * Since we may have cleaned up the interrupt triggers, manually | |
340 | * process any pending IPIs before exiting our critical section. | |
341 | * Once the critical section has exited, normal interrupt processing | |
342 | * may occur. | |
343 | */ | |
344 | atomic_swap_int(&mycpu->gd_npoll, 0); | |
da673940 JG |
345 | lwkt_process_ipiq(); |
346 | ||
347 | /* | |
348 | * Releasing the mp lock lets the BSP finish up the SMP init | |
349 | */ | |
350 | rel_mplock(); | |
351 | KKASSERT((curthread->td_flags & TDF_RUNQ) == 0); | |
352 | } | |
353 | ||
354 | void | |
355 | init_secondary(void) | |
356 | { | |
357 | int myid = bootAP; | |
358 | struct mdglobaldata *md; | |
359 | struct privatespace *ps; | |
360 | ||
361 | ps = &CPU_prvspace[myid]; | |
362 | ||
363 | KKASSERT(ps->mdglobaldata.mi.gd_prvspace == ps); | |
364 | ||
365 | /* | |
366 | * Setup the %gs for cpu #n. The mycpu macro works after this | |
367 | * point. Note that %fs is used by pthreads. | |
368 | */ | |
369 | tls_set_gs(&CPU_prvspace[myid], sizeof(struct privatespace)); | |
370 | ||
371 | md = mdcpu; /* loaded through %gs:0 (mdglobaldata.mi.gd_prvspace)*/ | |
372 | ||
373 | /* JG */ | |
374 | md->gd_common_tss.tss_rsp0 = 0; /* not used until after switch */ | |
375 | //md->gd_common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL); | |
376 | //md->gd_common_tss.tss_ioopt = (sizeof md->gd_common_tss) << 16; | |
377 | ||
378 | /* | |
379 | * Set to a known state: | |
380 | * Set by mpboot.s: CR0_PG, CR0_PE | |
381 | * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM | |
382 | */ | |
383 | } | |
384 | ||
385 | static int | |
386 | start_all_aps(u_int boot_addr) | |
387 | { | |
388 | int x, i; | |
389 | struct mdglobaldata *gd; | |
390 | struct privatespace *ps; | |
391 | vm_page_t m; | |
392 | vm_offset_t va; | |
a86ce0cd | 393 | pthread_attr_t attr; |
d97990a1 | 394 | size_t ipiq_size; |
da673940 JG |
395 | #if 0 |
396 | struct lwp_params params; | |
397 | #endif | |
398 | ||
399 | /* | |
400 | * needed for ipis to initial thread | |
401 | * FIXME: rename ap_tids? | |
402 | */ | |
403 | ap_tids[0] = pthread_self(); | |
a86ce0cd | 404 | pthread_attr_init(&attr); |
da673940 | 405 | |
712b6620 | 406 | vm_object_hold(kernel_object); |
c91894e0 | 407 | for (x = 1; x <= naps; ++x) { |
da673940 | 408 | /* Allocate space for the CPU's private space. */ |
da673940 JG |
409 | for (i = 0; i < sizeof(struct mdglobaldata); i += PAGE_SIZE) { |
410 | va =(vm_offset_t)&CPU_prvspace[x].mdglobaldata + i; | |
712b6620 | 411 | m = vm_page_alloc(kernel_object, va, VM_ALLOC_SYSTEM); |
da673940 JG |
412 | pmap_kenter_quick(va, m->phys_addr); |
413 | } | |
414 | ||
415 | for (i = 0; i < sizeof(CPU_prvspace[x].idlestack); i += PAGE_SIZE) { | |
416 | va =(vm_offset_t)&CPU_prvspace[x].idlestack + i; | |
712b6620 | 417 | m = vm_page_alloc(kernel_object, va, VM_ALLOC_SYSTEM); |
da673940 JG |
418 | pmap_kenter_quick(va, m->phys_addr); |
419 | } | |
420 | ||
421 | gd = &CPU_prvspace[x].mdglobaldata; /* official location */ | |
422 | bzero(gd, sizeof(*gd)); | |
423 | gd->mi.gd_prvspace = ps = &CPU_prvspace[x]; | |
424 | ||
425 | /* prime data page for it to use */ | |
426 | mi_gdinit(&gd->mi, x); | |
427 | cpu_gdinit(gd, x); | |
428 | ||
429 | #if 0 | |
430 | gd->gd_CMAP1 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE1); | |
431 | gd->gd_CMAP2 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE2); | |
432 | gd->gd_CMAP3 = pmap_kpte((vm_offset_t)CPU_prvspace[x].CPAGE3); | |
433 | gd->gd_PMAP1 = pmap_kpte((vm_offset_t)CPU_prvspace[x].PPAGE1); | |
434 | gd->gd_CADDR1 = ps->CPAGE1; | |
435 | gd->gd_CADDR2 = ps->CPAGE2; | |
436 | gd->gd_CADDR3 = ps->CPAGE3; | |
437 | gd->gd_PADDR1 = (vpte_t *)ps->PPAGE1; | |
438 | #endif | |
439 | ||
c91894e0 | 440 | ipiq_size = sizeof(struct lwkt_ipiq) * (naps + 1); |
1eeaf6b2 | 441 | gd->mi.gd_ipiq = (void *)kmem_alloc(kernel_map, ipiq_size, |
3091de50 | 442 | VM_SUBSYS_IPIQ); |
1997b4c2 | 443 | bzero(gd->mi.gd_ipiq, ipiq_size); |
da673940 | 444 | |
cc3685b0 SZ |
445 | /* initialize arc4random. */ |
446 | arc4_init_pcpu(x); | |
447 | ||
da673940 JG |
448 | /* |
449 | * Setup the AP boot stack | |
450 | */ | |
451 | bootSTK = &ps->idlestack[UPAGES*PAGE_SIZE/2]; | |
452 | bootAP = x; | |
453 | ||
454 | /* | |
455 | * Setup the AP's lwp, this is the 'cpu' | |
456 | * | |
457 | * We have to make sure our signals are masked or the new LWP | |
458 | * may pick up a signal that it isn't ready for yet. SMP | |
459 | * startup occurs after SI_BOOT2_LEAVE_CRIT so interrupts | |
460 | * have already been enabled. | |
461 | */ | |
462 | cpu_disable_intr(); | |
a86ce0cd | 463 | |
a86ce0cd | 464 | pthread_create(&ap_tids[x], &attr, start_ap, NULL); |
da673940 JG |
465 | cpu_enable_intr(); |
466 | ||
c07315c4 | 467 | while (CPUMASK_TESTBIT(smp_startup_mask, x) == 0) { |
da673940 JG |
468 | cpu_lfence(); /* XXX spin until the AP has started */ |
469 | DELAY(1000); | |
470 | } | |
471 | } | |
712b6620 | 472 | vm_object_drop(kernel_object); |
a86ce0cd | 473 | pthread_attr_destroy(&attr); |
da673940 JG |
474 | |
475 | return(ncpus - 1); | |
476 | } | |
9bea6114 MC |
477 | |
478 | /* | |
479 | * CPU TOPOLOGY DETECTION FUNCTIONS. | |
480 | */ | |
9bea6114 MC |
481 | void |
482 | detect_cpu_topology(void) | |
483 | { | |
484 | logical_CPU_bits = vkernel_b_arg; | |
485 | core_bits = vkernel_B_arg; | |
486 | } | |
487 | ||
488 | int | |
489 | get_chip_ID(int cpuid) | |
490 | { | |
491 | return get_apicid_from_cpuid(cpuid) >> | |
492 | (logical_CPU_bits + core_bits); | |
493 | } | |
494 | ||
c91894e0 MD |
495 | int |
496 | get_chip_ID_from_APICID(int apicid) | |
497 | { | |
498 | return apicid >> (logical_CPU_bits + core_bits); | |
499 | } | |
500 | ||
9bea6114 MC |
501 | int |
502 | get_core_number_within_chip(int cpuid) | |
503 | { | |
c91894e0 MD |
504 | return ((get_apicid_from_cpuid(cpuid) >> logical_CPU_bits) & |
505 | ((1 << core_bits) - 1)); | |
9bea6114 MC |
506 | } |
507 | ||
508 | int | |
509 | get_logical_CPU_number_within_core(int cpuid) | |
510 | { | |
c91894e0 MD |
511 | return (get_apicid_from_cpuid(cpuid) & |
512 | ((1 << logical_CPU_bits) - 1)); | |
9bea6114 | 513 | } |