2 * Copyright (c) 2007 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
34 * $DragonFly: src/sys/platform/pc64/amd64/mp.c,v 1.2 2007/09/24 03:24:45 yanyh Exp $
38 #include <sys/interrupt.h>
39 #include <sys/kernel.h>
40 #include <sys/memrange.h>
42 #include <sys/types.h>
44 #include <vm/vm_extern.h>
45 #include <vm/vm_kern.h>
46 #include <vm/vm_object.h>
47 #include <vm/vm_page.h>
49 #include <machine/cpu.h>
50 #include <machine/cpufunc.h>
51 #include <machine/globaldata.h>
52 #include <machine/md_var.h>
53 #include <machine/pmap.h>
54 #include <machine/smp.h>
55 #include <machine/tls.h>
62 extern pt_entry_t
*KPTphys
;
64 volatile u_int stopped_cpus
;
65 cpumask_t smp_active_mask
= 1; /* which cpus are ready for IPIs etc? */
66 static int boot_address
;
67 static cpumask_t smp_startup_mask
= 1; /* which cpus have been started */
68 int mp_naps
; /* # of Applications processors */
71 /* function prototypes XXX these should go elsewhere */
72 void bootstrap_idle(void);
73 void single_cpu_ipi(int, int, int);
74 void selected_cpu_ipi(u_int
, int, int);
76 void ipi_handler(int);
81 /* AP uses this during bootstrap. Do not staticize. */
86 /* XXX these need to go into the appropriate header file */
87 static int start_all_aps(u_int
);
88 void init_secondary(void);
89 void *start_ap(void *);
92 * Get SMP fully working before we start initializing devices.
99 cpumask_t ncpus_mask
= 0;
101 for (i
= 1; i
<= ncpus
; i
++)
102 ncpus_mask
|= (1 << i
);
106 kprintf("Finish MP startup\n");
108 /* build our map of 'other' CPUs */
109 mycpu
->gd_other_cpus
= smp_startup_mask
& ~(1 << mycpu
->gd_cpuid
);
112 * Let the other cpu's finish initializing and build their map
116 while (smp_active_mask
!= smp_startup_mask
) {
121 while (try_mplock() == 0)
124 kprintf("Active CPU Mask: %08x\n", smp_active_mask
);
127 SYSINIT(finishsmp
, SI_BOOT2_FINISH_SMP
, SI_ORDER_FIRST
, ap_finish
, NULL
)
131 start_ap(void *arg __unused
)
137 return(NULL
); /* NOTREACHED */
140 /* storage for AP thread IDs */
141 pthread_t ap_tids
[MAXCPU
];
152 /* ncpus2 -- ncpus rounded down to the nearest power of 2 */
153 for (shift
= 0; (1 << shift
) <= ncpus
; ++shift
)
156 ncpus2_shift
= shift
;
158 ncpus2_mask
= ncpus2
- 1;
160 /* ncpus_fit -- ncpus rounded up to the nearest power of 2 */
161 if ((1 << shift
) < ncpus
)
163 ncpus_fit
= 1 << shift
;
164 ncpus_fit_mask
= ncpus_fit
- 1;
167 * cpu0 initialization
169 mycpu
->gd_ipiq
= (void *)kmem_alloc(&kernel_map
,
170 sizeof(lwkt_ipiq
) * ncpus
);
171 bzero(mycpu
->gd_ipiq
, sizeof(lwkt_ipiq
) * ncpus
);
176 start_all_aps(boot_address
);
185 kprintf("DragonFly/MP: Multiprocessor\n");
186 kprintf(" cpu0 (BSP)\n");
188 for (x
= 1; x
<= mp_naps
; ++x
)
189 kprintf(" cpu%d (AP)\n", x
);
193 forward_fastint_remote(void *arg
)
195 panic("XXX forward_fastint_remote()");
199 cpu_send_ipiq(int dcpu
)
201 if ((1 << dcpu
) & smp_active_mask
)
202 if (pthread_kill(ap_tids
[dcpu
], SIGUSR1
) != 0)
203 panic("pthread_kill failed in cpu_send_ipiq");
205 panic("XXX cpu_send_ipiq()");
217 single_cpu_ipi(int cpu
, int vector
, int delivery_mode
)
219 kprintf("XXX single_cpu_ipi\n");
223 selected_cpu_ipi(u_int target
, int vector
, int delivery_mode
)
227 int n
= bsfl(target
);
229 single_cpu_ipi(n
, vector
, delivery_mode
);
237 map
&= smp_active_mask
;
243 if (pthread_kill(ap_tids
[n
], SIGSTOP
) != 0)
244 panic("stop_cpus: pthread_kill failed");
248 panic("XXX stop_cpus()");
255 restart_cpus(u_int map
)
257 map
&= smp_active_mask
;
263 if (pthread_kill(ap_tids
[n
], SIGCONT
) != 0)
264 panic("restart_cpus: pthread_kill failed");
268 panic("XXX restart_cpus()");
278 * Adjust smp_startup_mask to signal the BSP that we have started
279 * up successfully. Note that we do not yet hold the BGL. The BSP
280 * is waiting for our signal.
282 * We can't set our bit in smp_active_mask yet because we are holding
283 * interrupts physically disabled and remote cpus could deadlock
284 * trying to send us an IPI.
286 smp_startup_mask
|= 1 << mycpu
->gd_cpuid
;
290 * Interlock for finalization. Wait until mp_finish is non-zero,
291 * then get the MP lock.
293 * Note: We are in a critical section.
295 * Note: We have to synchronize td_mpcount to our desired MP state
296 * before calling cpu_try_mplock().
298 * Note: we are the idle thread, we can only spin.
300 * Note: The load fence is memory volatile and prevents the compiler
301 * from improperly caching mp_finish, and the cpu from improperly
305 while (mp_finish
== 0) {
309 ++curthread
->td_mpcount
;
310 while (cpu_try_mplock() == 0)
313 /* BSP may have changed PTD while we're waiting for the lock */
316 /* Build our map of 'other' CPUs. */
317 mycpu
->gd_other_cpus
= smp_startup_mask
& ~(1 << mycpu
->gd_cpuid
);
319 kprintf("SMP: AP CPU #%d Launched!\n", mycpu
->gd_cpuid
);
322 /* Set memory range attributes for this CPU to match the BSP */
325 * Once we go active we must process any IPIQ messages that may
326 * have been queued, because no actual IPI will occur until we
327 * set our bit in the smp_active_mask. If we don't the IPI
328 * message interlock could be left set which would also prevent
331 * The idle loop doesn't expect the BGL to be held and while
332 * lwkt_switch() normally cleans things up this is a special case
333 * because we returning almost directly into the idle loop.
335 * The idle thread is never placed on the runq, make sure
336 * nothing we've done put it there.
338 KKASSERT(curthread
->td_mpcount
== 1);
339 smp_active_mask
|= 1 << mycpu
->gd_cpuid
;
341 mdcpu
->gd_fpending
= 0;
342 mdcpu
->gd_ipending
= 0;
343 initclocks_pcpu(); /* clock interrupts (via IPIs) */
347 * Releasing the mp lock lets the BSP finish up the SMP init
350 KKASSERT((curthread
->td_flags
& TDF_RUNQ
) == 0);
357 struct mdglobaldata
*md
;
358 struct privatespace
*ps
;
360 ps
= &CPU_prvspace
[myid
];
362 KKASSERT(ps
->mdglobaldata
.mi
.gd_prvspace
== ps
);
365 * Setup the %gs for cpu #n. The mycpu macro works after this
368 tls_set_fs(&CPU_prvspace
[myid
], sizeof(struct privatespace
));
370 md
= mdcpu
; /* loaded through %fs:0 (mdglobaldata.mi.gd_prvspace)*/
372 md
->gd_common_tss
.tss_esp0
= 0; /* not used until after switch */
373 md
->gd_common_tss
.tss_ss0
= GSEL(GDATA_SEL
, SEL_KPL
);
374 md
->gd_common_tss
.tss_ioopt
= (sizeof md
->gd_common_tss
) << 16;
377 * Set to a known state:
378 * Set by mpboot.s: CR0_PG, CR0_PE
379 * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
384 start_all_aps(u_int boot_addr
)
387 struct mdglobaldata
*gd
;
388 struct privatespace
*ps
;
392 struct lwp_params params
;
396 * needed for ipis to initial thread
397 * FIXME: rename ap_tids?
399 ap_tids
[0] = pthread_self();
401 for (x
= 1; x
<= mp_naps
; x
++)
403 /* Allocate space for the CPU's private space. */
404 va
= (vm_offset_t
)&CPU_prvspace
[x
];
405 for (i
= 0; i
< sizeof(struct mdglobaldata
); i
+= PAGE_SIZE
) {
406 va
=(vm_offset_t
)&CPU_prvspace
[x
].mdglobaldata
+ i
;
407 m
= vm_page_alloc(&kernel_object
, va
, VM_ALLOC_SYSTEM
);
408 pmap_kenter_quick(va
, m
->phys_addr
);
411 for (i
= 0; i
< sizeof(CPU_prvspace
[x
].idlestack
); i
+= PAGE_SIZE
) {
412 va
=(vm_offset_t
)&CPU_prvspace
[x
].idlestack
+ i
;
413 m
= vm_page_alloc(&kernel_object
, va
, VM_ALLOC_SYSTEM
);
414 pmap_kenter_quick(va
, m
->phys_addr
);
417 gd
= &CPU_prvspace
[x
].mdglobaldata
; /* official location */
418 bzero(gd
, sizeof(*gd
));
419 gd
->mi
.gd_prvspace
= ps
= &CPU_prvspace
[x
];
421 /* prime data page for it to use */
422 mi_gdinit(&gd
->mi
, x
);
426 gd
->gd_CMAP1
= pmap_kpte((vm_offset_t
)CPU_prvspace
[x
].CPAGE1
);
427 gd
->gd_CMAP2
= pmap_kpte((vm_offset_t
)CPU_prvspace
[x
].CPAGE2
);
428 gd
->gd_CMAP3
= pmap_kpte((vm_offset_t
)CPU_prvspace
[x
].CPAGE3
);
429 gd
->gd_PMAP1
= pmap_kpte((vm_offset_t
)CPU_prvspace
[x
].PPAGE1
);
430 gd
->gd_CADDR1
= ps
->CPAGE1
;
431 gd
->gd_CADDR2
= ps
->CPAGE2
;
432 gd
->gd_CADDR3
= ps
->CPAGE3
;
433 gd
->gd_PADDR1
= (vpte_t
*)ps
->PPAGE1
;
436 gd
->mi
.gd_ipiq
= (void *)kmem_alloc(&kernel_map
, sizeof(lwkt_ipiq
) * (mp_naps
+ 1));
437 bzero(gd
->mi
.gd_ipiq
, sizeof(lwkt_ipiq
) * (mp_naps
+ 1));
440 * Setup the AP boot stack
442 bootSTK
= &ps
->idlestack
[UPAGES
*PAGE_SIZE
/2];
446 * Setup the AP's lwp, this is the 'cpu'
448 pthread_create(&ap_tids
[x
], NULL
, start_ap
, NULL
);
450 while((smp_startup_mask
& (1 << x
)) == 0) {
451 cpu_lfence(); /* XXX spin until the AP has started */