2 * Copyright (c) 1996, by Steve Passe
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. The name of the developer may NOT be used to endorse or promote products
11 * derived from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * $FreeBSD: src/sys/i386/i386/mp_machdep.c,v 1.115.2.15 2003/03/14 21:22:35 jhb Exp $
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/sysctl.h>
34 #include <sys/malloc.h>
35 #include <sys/memrange.h>
36 #include <sys/cons.h> /* cngetc() */
37 #include <sys/machintr.h>
39 #include <sys/mplock2.h>
42 #include <vm/vm_param.h>
44 #include <vm/vm_kern.h>
45 #include <vm/vm_extern.h>
47 #include <vm/vm_map.h>
53 #include <machine/smp.h>
54 #include <machine_base/apic/apicreg.h>
55 #include <machine/atomic.h>
56 #include <machine/cpufunc.h>
57 #include <machine/cputypes.h>
58 #include <machine_base/apic/lapic.h>
59 #include <machine_base/apic/ioapic.h>
60 #include <machine/psl.h>
61 #include <machine/segments.h>
62 #include <machine/tss.h>
63 #include <machine/specialreg.h>
64 #include <machine/globaldata.h>
65 #include <machine/pmap_inval.h>
67 #include <machine/md_var.h> /* setidt() */
68 #include <machine_base/icu/icu.h> /* IPIs */
69 #include <machine_base/icu/icu_var.h>
70 #include <machine_base/apic/ioapic_abi.h>
71 #include <machine/intr_machdep.h> /* IPIs */
73 #define WARMBOOT_TARGET 0
74 #define WARMBOOT_OFF (KERNBASE + 0x0467)
75 #define WARMBOOT_SEG (KERNBASE + 0x0469)
77 #define CMOS_REG (0x70)
78 #define CMOS_DATA (0x71)
79 #define BIOS_RESET (0x0f)
80 #define BIOS_WARM (0x0a)
83 * this code MUST be enabled here and in mpboot.s.
84 * it follows the very early stages of AP boot by placing values in CMOS ram.
85 * it NORMALLY will never be needed and thus the primitive method for enabling.
88 #if defined(CHECK_POINTS)
89 #define CHECK_READ(A) (outb(CMOS_REG, (A)), inb(CMOS_DATA))
90 #define CHECK_WRITE(A,D) (outb(CMOS_REG, (A)), outb(CMOS_DATA, (D)))
92 #define CHECK_INIT(D); \
93 CHECK_WRITE(0x34, (D)); \
94 CHECK_WRITE(0x35, (D)); \
95 CHECK_WRITE(0x36, (D)); \
96 CHECK_WRITE(0x37, (D)); \
97 CHECK_WRITE(0x38, (D)); \
98 CHECK_WRITE(0x39, (D));
100 #define CHECK_PRINT(S); \
101 kprintf("%s: %d, %d, %d, %d, %d, %d\n", \
110 #else /* CHECK_POINTS */
112 #define CHECK_INIT(D)
113 #define CHECK_PRINT(S)
115 #endif /* CHECK_POINTS */
118 * Values to send to the POST hardware.
120 #define MP_BOOTADDRESS_POST 0x10
121 #define MP_PROBE_POST 0x11
122 #define MPTABLE_PASS1_POST 0x12
124 #define MP_START_POST 0x13
125 #define MP_ENABLE_POST 0x14
126 #define MPTABLE_PASS2_POST 0x15
128 #define START_ALL_APS_POST 0x16
129 #define INSTALL_AP_TRAMP_POST 0x17
130 #define START_AP_POST 0x18
132 #define MP_ANNOUNCE_POST 0x19
134 /** XXX FIXME: where does this really belong, isa.h/isa.c perhaps? */
135 int current_postcode;
137 /** XXX FIXME: what system files declare these??? */
138 extern struct region_descriptor r_gdt;
144 extern int64_t tsc_offsets[];
146 /* AP uses this during bootstrap. Do not staticize. */
150 struct pcb stoppcbs[MAXCPU];
152 extern inthand_t IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
155 * Local data and functions.
158 static u_int boot_address;
159 static int mp_finish;
160 static int mp_finish_lapic;
162 static int start_all_aps(u_int boot_addr);
164 static void install_ap_tramp(u_int boot_addr);
166 static int start_ap(struct mdglobaldata *gd, u_int boot_addr, int smibest);
167 static int smitest(void);
168 static void mp_bsp_simple_setup(void);
170 static cpumask_t smp_startup_mask = 1; /* which cpus have been started */
171 static cpumask_t smp_lapic_mask = 1; /* which cpus have lapic been inited */
172 cpumask_t smp_active_mask = 1; /* which cpus are ready for IPIs etc? */
173 SYSCTL_INT(_machdep, OID_AUTO, smp_active, CTLFLAG_RD, &smp_active_mask, 0, "");
174 static u_int bootMP_size;
176 /* Local data for detecting CPU TOPOLOGY */
177 static int core_bits = 0;
178 static int logical_CPU_bits = 0;
182 * Calculate usable address in base memory for AP trampoline code.
185 mp_bootaddress(u_int basemem)
187 POSTCODE(MP_BOOTADDRESS_POST);
189 bootMP_size = mptramp_end - mptramp_start;
190 boot_address = trunc_page(basemem * 1024); /* round down to 4k boundary */
191 if (((basemem * 1024) - boot_address) < bootMP_size)
192 boot_address -= PAGE_SIZE; /* not enough, lower by 4k */
193 /* 3 levels of page table pages */
194 mptramp_pagetables = boot_address - (PAGE_SIZE * 3);
196 return mptramp_pagetables;
200 * Print various information about the SMP system hardware and setup.
207 POSTCODE(MP_ANNOUNCE_POST);
209 kprintf("DragonFly/MP: Multiprocessor motherboard\n");
210 kprintf(" cpu0 (BSP): apic id: %2d\n", CPUID_TO_APICID(0));
211 for (x = 1; x <= naps; ++x)
212 kprintf(" cpu%d (AP): apic id: %2d\n", x, CPUID_TO_APICID(x));
215 kprintf(" Warning: APIC I/O disabled\n");
219 * AP cpu's call this to sync up protected mode.
221 * WARNING! %gs is not set up on entry. This routine sets up %gs.
227 int x, myid = bootAP;
229 struct mdglobaldata *md;
230 struct privatespace *ps;
232 ps = &CPU_prvspace[myid];
234 gdt_segs[GPROC0_SEL].ssd_base =
235 (long) &ps->mdglobaldata.gd_common_tss;
236 ps->mdglobaldata.mi.gd_prvspace = ps;
238 /* We fill the 32-bit segment descriptors */
239 for (x = 0; x < NGDT; x++) {
240 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1))
241 ssdtosd(&gdt_segs[x], &gdt[myid * NGDT + x]);
243 /* And now a 64-bit one */
244 ssdtosyssd(&gdt_segs[GPROC0_SEL],
245 (struct system_segment_descriptor *)&gdt[myid * NGDT + GPROC0_SEL]);
247 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
248 r_gdt.rd_base = (long) &gdt[myid * NGDT];
249 lgdt(&r_gdt); /* does magic intra-segment return */
251 /* lgdt() destroys the GSBASE value, so we load GSBASE after lgdt() */
252 wrmsr(MSR_FSBASE, 0); /* User value */
253 wrmsr(MSR_GSBASE, (u_int64_t)ps);
254 wrmsr(MSR_KGSBASE, 0); /* XXX User value while we're in the kernel */
256 lidt(&r_idt_arr[mdcpu->mi.gd_cpuid]);
260 mdcpu->gd_currentldt = _default_ldt;
263 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
264 gdt[myid * NGDT + GPROC0_SEL].sd_type = SDT_SYSTSS;
266 md = mdcpu; /* loaded through %gs:0 (mdglobaldata.mi.gd_prvspace)*/
268 md->gd_common_tss.tss_rsp0 = 0; /* not used until after switch */
270 md->gd_common_tss.tss_ioopt = (sizeof md->gd_common_tss) << 16;
272 md->gd_tss_gdt = &gdt[myid * NGDT + GPROC0_SEL];
273 md->gd_common_tssd = *md->gd_tss_gdt;
275 /* double fault stack */
276 md->gd_common_tss.tss_ist1 =
277 (long)&md->mi.gd_prvspace->idlestack[
278 sizeof(md->mi.gd_prvspace->idlestack)];
283 * Set to a known state:
284 * Set by mpboot.s: CR0_PG, CR0_PE
285 * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
288 cr0 &= ~(CR0_CD | CR0_NW | CR0_EM);
291 /* Set up the fast syscall stuff */
292 msr = rdmsr(MSR_EFER) | EFER_SCE;
293 wrmsr(MSR_EFER, msr);
294 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
295 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
296 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
297 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
298 wrmsr(MSR_STAR, msr);
299 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D|PSL_IOPL);
301 pmap_set_opt(); /* PSE/4MB pages, etc */
303 /* Initialize the PAT MSR. */
307 /* set up CPU registers and state */
310 /* set up SSE/NX registers */
313 /* set up FPU state on the AP */
314 npxinit(__INITIAL_FPUCW__);
316 /* disable the APIC, just to be SURE */
317 lapic->svr &= ~APIC_SVR_ENABLE;
320 /*******************************************************************
321 * local functions and data
325 * Start the SMP system
328 mp_start_aps(void *dummy __unused)
331 /* start each Application Processor */
332 start_all_aps(boot_address);
334 mp_bsp_simple_setup();
337 SYSINIT(startaps, SI_BOOT2_START_APS, SI_ORDER_FIRST, mp_start_aps, NULL)
340 * start each AP in our list
343 start_all_aps(u_int boot_addr)
345 vm_offset_t va = boot_address + KERNBASE;
346 u_int64_t *pt4, *pt3, *pt2;
353 u_long mpbioswarmvec;
354 struct mdglobaldata *gd;
355 struct privatespace *ps;
357 POSTCODE(START_ALL_APS_POST);
359 /* install the AP 1st level boot code */
360 pmap_kenter(va, boot_address);
361 cpu_invlpg((void *)va); /* JG XXX */
362 bcopy(mptramp_start, (void *)va, bootMP_size);
364 /* Locate the page tables, they'll be below the trampoline */
365 pt4 = (u_int64_t *)(uintptr_t)(mptramp_pagetables + KERNBASE);
366 pt3 = pt4 + (PAGE_SIZE) / sizeof(u_int64_t);
367 pt2 = pt3 + (PAGE_SIZE) / sizeof(u_int64_t);
369 /* Create the initial 1GB replicated page tables */
370 for (i = 0; i < 512; i++) {
371 /* Each slot of the level 4 pages points to the same level 3 page */
372 pt4[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + PAGE_SIZE);
373 pt4[i] |= PG_V | PG_RW | PG_U;
375 /* Each slot of the level 3 pages points to the same level 2 page */
376 pt3[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + (2 * PAGE_SIZE));
377 pt3[i] |= PG_V | PG_RW | PG_U;
379 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
380 pt2[i] = i * (2 * 1024 * 1024);
381 pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
384 /* save the current value of the warm-start vector */
385 mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
386 outb(CMOS_REG, BIOS_RESET);
387 mpbiosreason = inb(CMOS_DATA);
389 /* setup a vector to our boot code */
390 *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
391 *((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
392 outb(CMOS_REG, BIOS_RESET);
393 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */
396 * If we have a TSC we can figure out the SMI interrupt rate.
397 * The SMI does not necessarily use a constant rate. Spend
398 * up to 250ms trying to figure it out.
401 if (cpu_feature & CPUID_TSC) {
402 set_apic_timer(275000);
403 smilast = read_apic_timer();
404 for (x = 0; x < 20 && read_apic_timer(); ++x) {
405 smicount = smitest();
406 if (smibest == 0 || smilast - smicount < smibest)
407 smibest = smilast - smicount;
410 if (smibest > 250000)
413 smibest = smibest * (int64_t)1000000 /
414 get_apic_timer_frequency();
418 kprintf("SMI Frequency (worst case): %d Hz (%d us)\n",
419 1000000 / smibest, smibest);
422 for (x = 1; x <= naps; ++x) {
424 /* This is a bit verbose, it will go away soon. */
426 /* first page of AP's private space */
427 pg = x * x86_64_btop(sizeof(struct privatespace));
429 /* allocate new private data page(s) */
430 gd = (struct mdglobaldata *)kmem_alloc(&kernel_map,
431 MDGLOBALDATA_BASEALLOC_SIZE);
433 gd = &CPU_prvspace[x].mdglobaldata; /* official location */
434 bzero(gd, sizeof(*gd));
435 gd->mi.gd_prvspace = ps = &CPU_prvspace[x];
437 /* prime data page for it to use */
438 mi_gdinit(&gd->mi, x);
440 gd->mi.gd_ipiq = (void *)kmem_alloc(&kernel_map, sizeof(lwkt_ipiq) * (naps + 1));
441 bzero(gd->mi.gd_ipiq, sizeof(lwkt_ipiq) * (naps + 1));
443 /* setup a vector to our boot code */
444 *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
445 *((volatile u_short *) WARMBOOT_SEG) = (boot_addr >> 4);
446 outb(CMOS_REG, BIOS_RESET);
447 outb(CMOS_DATA, BIOS_WARM); /* 'warm-start' */
450 * Setup the AP boot stack
452 bootSTK = &ps->idlestack[UPAGES*PAGE_SIZE/2];
455 /* attempt to start the Application Processor */
456 CHECK_INIT(99); /* setup checkpoints */
457 if (!start_ap(gd, boot_addr, smibest)) {
458 kprintf("\nAP #%d (PHY# %d) failed!\n",
459 x, CPUID_TO_APICID(x));
460 CHECK_PRINT("trace"); /* show checkpoints */
461 /* better panic as the AP may be running loose */
462 kprintf("panic y/n? [y] ");
466 CHECK_PRINT("trace"); /* show checkpoints */
469 /* set ncpus to 1 + highest logical cpu. Not all may have come up */
472 /* ncpus2 -- ncpus rounded down to the nearest power of 2 */
473 for (shift = 0; (1 << shift) <= ncpus; ++shift)
476 ncpus2_shift = shift;
478 ncpus2_mask = ncpus2 - 1;
480 /* ncpus_fit -- ncpus rounded up to the nearest power of 2 */
481 if ((1 << shift) < ncpus)
483 ncpus_fit = 1 << shift;
484 ncpus_fit_mask = ncpus_fit - 1;
486 /* build our map of 'other' CPUs */
487 mycpu->gd_other_cpus = smp_startup_mask & ~CPUMASK(mycpu->gd_cpuid);
488 mycpu->gd_ipiq = (void *)kmem_alloc(&kernel_map, sizeof(lwkt_ipiq) * ncpus);
489 bzero(mycpu->gd_ipiq, sizeof(lwkt_ipiq) * ncpus);
491 /* restore the warmstart vector */
492 *(u_long *) WARMBOOT_OFF = mpbioswarmvec;
493 outb(CMOS_REG, BIOS_RESET);
494 outb(CMOS_DATA, mpbiosreason);
497 * NOTE! The idlestack for the BSP was setup by locore. Finish
498 * up, clean out the P==V mapping we did earlier.
503 * Wait all APs to finish initializing LAPIC
507 kprintf("SMP: Waiting APs LAPIC initialization\n");
508 if (cpu_feature & CPUID_TSC)
509 tsc0_offset = rdtsc();
512 while (smp_lapic_mask != smp_startup_mask) {
514 if (cpu_feature & CPUID_TSC)
515 tsc0_offset = rdtsc();
517 while (try_mplock() == 0)
520 /* number of APs actually started */
526 * load the 1st level AP boot code into base memory.
529 /* targets for relocation */
530 extern void bigJump(void);
531 extern void bootCodeSeg(void);
532 extern void bootDataSeg(void);
533 extern void MPentry(void);
535 extern u_int mp_gdtbase;
540 install_ap_tramp(u_int boot_addr)
543 int size = *(int *) ((u_long) & bootMP_size);
544 u_char *src = (u_char *) ((u_long) bootMP);
545 u_char *dst = (u_char *) boot_addr + KERNBASE;
546 u_int boot_base = (u_int) bootMP;
551 POSTCODE(INSTALL_AP_TRAMP_POST);
553 for (x = 0; x < size; ++x)
557 * modify addresses in code we just moved to basemem. unfortunately we
558 * need fairly detailed info about mpboot.s for this to work. changes
559 * to mpboot.s might require changes here.
562 /* boot code is located in KERNEL space */
563 dst = (u_char *) boot_addr + KERNBASE;
565 /* modify the lgdt arg */
566 dst32 = (u_int32_t *) (dst + ((u_int) & mp_gdtbase - boot_base));
567 *dst32 = boot_addr + ((u_int) & MP_GDT - boot_base);
569 /* modify the ljmp target for MPentry() */
570 dst32 = (u_int32_t *) (dst + ((u_int) bigJump - boot_base) + 1);
571 *dst32 = ((u_int) MPentry - KERNBASE);
573 /* modify the target for boot code segment */
574 dst16 = (u_int16_t *) (dst + ((u_int) bootCodeSeg - boot_base));
575 dst8 = (u_int8_t *) (dst16 + 1);
576 *dst16 = (u_int) boot_addr & 0xffff;
577 *dst8 = ((u_int) boot_addr >> 16) & 0xff;
579 /* modify the target for boot data segment */
580 dst16 = (u_int16_t *) (dst + ((u_int) bootDataSeg - boot_base));
581 dst8 = (u_int8_t *) (dst16 + 1);
582 *dst16 = (u_int) boot_addr & 0xffff;
583 *dst8 = ((u_int) boot_addr >> 16) & 0xff;
589 * This function starts the AP (application processor) identified
590 * by the APIC ID 'physicalCpu'. It does quite a "song and dance"
591 * to accomplish this. This is necessary because of the nuances
592 * of the different hardware we might encounter. It ain't pretty,
593 * but it seems to work.
595 * NOTE: eventually an AP gets to ap_init(), which is called just
596 * before the AP goes into the LWKT scheduler's idle loop.
599 start_ap(struct mdglobaldata *gd, u_int boot_addr, int smibest)
603 u_long icr_lo, icr_hi;
605 POSTCODE(START_AP_POST);
607 /* get the PHYSICAL APIC ID# */
608 physical_cpu = CPUID_TO_APICID(gd->mi.gd_cpuid);
610 /* calculate the vector */
611 vector = (boot_addr >> 12) & 0xff;
613 /* We don't want anything interfering */
616 /* Make sure the target cpu sees everything */
620 * Try to detect when a SMI has occurred, wait up to 200ms.
622 * If a SMI occurs during an AP reset but before we issue
623 * the STARTUP command, the AP may brick. To work around
624 * this problem we hold off doing the AP startup until
625 * after we have detected the SMI. Hopefully another SMI
626 * will not occur before we finish the AP startup.
628 * Retries don't seem to help. SMIs have a window of opportunity
629 * and if USB->legacy keyboard emulation is enabled in the BIOS
630 * the interrupt rate can be quite high.
632 * NOTE: Don't worry about the L1 cache load, it might bloat
633 * ldelta a little but ndelta will be so huge when the SMI
634 * occurs the detection logic will still work fine.
637 set_apic_timer(200000);
642 * first we do an INIT/RESET IPI this INIT IPI might be run, reseting
643 * and running the target CPU. OR this INIT IPI might be latched (P5
644 * bug), CPU waiting for STARTUP IPI. OR this INIT IPI might be
647 * see apic/apicreg.h for icr bit definitions.
649 * TIME CRITICAL CODE, DO NOT DO ANY KPRINTFS IN THE HOT PATH.
653 * Setup the address for the target AP. We can setup
654 * icr_hi once and then just trigger operations with
657 icr_hi = lapic->icr_hi & ~APIC_ID_MASK;
658 icr_hi |= (physical_cpu << 24);
659 icr_lo = lapic->icr_lo & 0xfff00000;
660 lapic->icr_hi = icr_hi;
663 * Do an INIT IPI: assert RESET
665 * Use edge triggered mode to assert INIT
667 lapic->icr_lo = icr_lo | 0x00004500;
668 while (lapic->icr_lo & APIC_DELSTAT_MASK)
672 * The spec calls for a 10ms delay but we may have to use a
673 * MUCH lower delay to avoid bricking an AP due to a fast SMI
674 * interrupt. We have other loops here too and dividing by 2
675 * doesn't seem to be enough even after subtracting 350us,
678 * Our minimum delay is 150uS, maximum is 10ms. If no SMI
679 * interrupt was detected we use the full 10ms.
683 else if (smibest < 150 * 4 + 350)
685 else if ((smibest - 350) / 4 < 10000)
686 u_sleep((smibest - 350) / 4);
691 * Do an INIT IPI: deassert RESET
693 * Use level triggered mode to deassert. It is unclear
694 * why we need to do this.
696 lapic->icr_lo = icr_lo | 0x00008500;
697 while (lapic->icr_lo & APIC_DELSTAT_MASK)
699 u_sleep(150); /* wait 150us */
702 * Next we do a STARTUP IPI: the previous INIT IPI might still be
703 * latched, (P5 bug) this 1st STARTUP would then terminate
704 * immediately, and the previously started INIT IPI would continue. OR
705 * the previous INIT IPI has already run. and this STARTUP IPI will
706 * run. OR the previous INIT IPI was ignored. and this STARTUP IPI
709 lapic->icr_lo = icr_lo | 0x00000600 | vector;
710 while (lapic->icr_lo & APIC_DELSTAT_MASK)
712 u_sleep(200); /* wait ~200uS */
715 * Finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF
716 * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR
717 * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is
718 * recognized after hardware RESET or INIT IPI.
720 lapic->icr_lo = icr_lo | 0x00000600 | vector;
721 while (lapic->icr_lo & APIC_DELSTAT_MASK)
724 /* Resume normal operation */
727 /* wait for it to start, see ap_init() */
728 set_apic_timer(5000000);/* == 5 seconds */
729 while (read_apic_timer()) {
730 if (smp_startup_mask & CPUMASK(gd->mi.gd_cpuid))
731 return 1; /* return SUCCESS */
734 return 0; /* return FAILURE */
749 while (read_apic_timer()) {
751 for (count = 0; count < 100; ++count)
752 ntsc = rdtsc(); /* force loop to occur */
754 ndelta = ntsc - ltsc;
757 if (ndelta > ldelta * 2)
760 ldelta = ntsc - ltsc;
763 return(read_apic_timer());
767 * Synchronously flush the TLB on all other CPU's. The current cpu's
768 * TLB is not flushed. If the caller wishes to flush the current cpu's
769 * TLB the caller must call cpu_invltlb() in addition to smp_invltlb().
771 * NOTE: If for some reason we were unable to start all cpus we cannot
772 * safely use broadcast IPIs.
775 static cpumask_t smp_invltlb_req;
777 #define SMP_INVLTLB_DEBUG
782 struct mdglobaldata *md = mdcpu;
783 #ifdef SMP_INVLTLB_DEBUG
788 crit_enter_gd(&md->mi);
789 md->gd_invltlb_ret = 0;
790 ++md->mi.gd_cnt.v_smpinvltlb;
791 atomic_set_cpumask(&smp_invltlb_req, md->mi.gd_cpumask);
792 #ifdef SMP_INVLTLB_DEBUG
795 if (smp_startup_mask == smp_active_mask) {
796 all_but_self_ipi(XINVLTLB_OFFSET);
798 selected_apic_ipi(smp_active_mask & ~md->mi.gd_cpumask,
799 XINVLTLB_OFFSET, APIC_DELMODE_FIXED);
802 #ifdef SMP_INVLTLB_DEBUG
804 kprintf("smp_invltlb: ipi sent\n");
806 while ((md->gd_invltlb_ret & smp_active_mask & ~md->mi.gd_cpumask) !=
807 (smp_active_mask & ~md->mi.gd_cpumask)) {
810 #ifdef SMP_INVLTLB_DEBUG
812 if (++count == 400000000) {
814 kprintf("smp_invltlb: endless loop %08lx %08lx, "
815 "rflags %016jx retry",
816 (long)md->gd_invltlb_ret,
817 (long)smp_invltlb_req,
818 (intmax_t)read_rflags());
819 __asm __volatile ("sti");
824 int bcpu = BSFCPUMASK(~md->gd_invltlb_ret &
829 kprintf("bcpu %d\n", bcpu);
830 xgd = globaldata_find(bcpu);
831 kprintf("thread %p %s\n", xgd->gd_curthread, xgd->gd_curthread->td_comm);
834 Debugger("giving up");
840 atomic_clear_cpumask(&smp_invltlb_req, md->mi.gd_cpumask);
841 crit_exit_gd(&md->mi);
845 * Called from Xinvltlb assembly with interrupts disabled. We didn't
846 * bother to bump the critical section count or nested interrupt count
847 * so only do very low level operations here.
850 smp_invltlb_intr(void)
852 struct mdglobaldata *md = mdcpu;
853 struct mdglobaldata *omd;
858 mask = smp_invltlb_req;
861 cpu = BSFCPUMASK(mask);
862 mask &= ~CPUMASK(cpu);
863 omd = (struct mdglobaldata *)globaldata_find(cpu);
864 atomic_set_cpumask(&omd->gd_invltlb_ret, md->mi.gd_cpumask);
869 * When called the executing CPU will send an IPI to all other CPUs
870 * requesting that they halt execution.
872 * Usually (but not necessarily) called with 'other_cpus' as its arg.
874 * - Signals all CPUs in map to stop.
875 * - Waits for each to stop.
882 * XXX FIXME: this is not MP-safe, needs a lock to prevent multiple CPUs
883 * from executing at same time.
886 stop_cpus(cpumask_t map)
888 map &= smp_active_mask;
890 /* send the Xcpustop IPI to all CPUs in map */
891 selected_apic_ipi(map, XCPUSTOP_OFFSET, APIC_DELMODE_FIXED);
893 while ((stopped_cpus & map) != map)
901 * Called by a CPU to restart stopped CPUs.
903 * Usually (but not necessarily) called with 'stopped_cpus' as its arg.
905 * - Signals all CPUs in map to restart.
906 * - Waits for each to restart.
914 restart_cpus(cpumask_t map)
916 /* signal other cpus to restart */
917 started_cpus = map & smp_active_mask;
919 while ((stopped_cpus & map) != 0) /* wait for each to clear its bit */
926 * This is called once the mpboot code has gotten us properly relocated
927 * and the MMU turned on, etc. ap_init() is actually the idle thread,
928 * and when it returns the scheduler will call the real cpu_idle() main
929 * loop for the idlethread. Interrupts are disabled on entry and should
930 * remain disabled at return.
938 * Adjust smp_startup_mask to signal the BSP that we have started
939 * up successfully. Note that we do not yet hold the BGL. The BSP
940 * is waiting for our signal.
942 * We can't set our bit in smp_active_mask yet because we are holding
943 * interrupts physically disabled and remote cpus could deadlock
944 * trying to send us an IPI.
946 smp_startup_mask |= CPUMASK(mycpu->gd_cpuid);
950 * Interlock for LAPIC initialization. Wait until mp_finish_lapic is
951 * non-zero, then get the MP lock.
953 * Note: We are in a critical section.
955 * Note: we are the idle thread, we can only spin.
957 * Note: The load fence is memory volatile and prevents the compiler
958 * from improperly caching mp_finish_lapic, and the cpu from improperly
961 while (mp_finish_lapic == 0)
963 while (try_mplock() == 0)
966 if (cpu_feature & CPUID_TSC) {
968 * The BSP is constantly updating tsc0_offset, figure out
969 * the relative difference to synchronize ktrdump.
971 tsc_offsets[mycpu->gd_cpuid] = rdtsc() - tsc0_offset;
974 /* BSP may have changed PTD while we're waiting for the lock */
977 /* Build our map of 'other' CPUs. */
978 mycpu->gd_other_cpus = smp_startup_mask & ~CPUMASK(mycpu->gd_cpuid);
980 /* A quick check from sanity claus */
981 cpu_id = APICID_TO_CPUID((lapic->id & 0xff000000) >> 24);
982 if (mycpu->gd_cpuid != cpu_id) {
983 kprintf("SMP: assigned cpuid = %d\n", mycpu->gd_cpuid);
984 kprintf("SMP: actual cpuid = %d lapicid %d\n",
985 cpu_id, (lapic->id & 0xff000000) >> 24);
987 kprintf("PTD[MPPTDI] = %p\n", (void *)PTD[MPPTDI]);
989 panic("cpuid mismatch! boom!!");
992 /* Initialize AP's local APIC for irq's */
995 /* LAPIC initialization is done */
996 smp_lapic_mask |= CPUMASK(mycpu->gd_cpuid);
999 /* Let BSP move onto the next initialization stage */
1003 * Interlock for finalization. Wait until mp_finish is non-zero,
1004 * then get the MP lock.
1006 * Note: We are in a critical section.
1008 * Note: we are the idle thread, we can only spin.
1010 * Note: The load fence is memory volatile and prevents the compiler
1011 * from improperly caching mp_finish, and the cpu from improperly
1014 while (mp_finish == 0)
1016 while (try_mplock() == 0)
1019 /* BSP may have changed PTD while we're waiting for the lock */
1022 /* Set memory range attributes for this CPU to match the BSP */
1023 mem_range_AP_init();
1026 * Once we go active we must process any IPIQ messages that may
1027 * have been queued, because no actual IPI will occur until we
1028 * set our bit in the smp_active_mask. If we don't the IPI
1029 * message interlock could be left set which would also prevent
1032 * The idle loop doesn't expect the BGL to be held and while
1033 * lwkt_switch() normally cleans things up this is a special case
1034 * because we returning almost directly into the idle loop.
1036 * The idle thread is never placed on the runq, make sure
1037 * nothing we've done put it there.
1039 KKASSERT(get_mplock_count(curthread) == 1);
1040 smp_active_mask |= CPUMASK(mycpu->gd_cpuid);
1043 * Enable interrupts here. idle_restore will also do it, but
1044 * doing it here lets us clean up any strays that got posted to
1045 * the CPU during the AP boot while we are still in a critical
1048 __asm __volatile("sti; pause; pause"::);
1049 bzero(mdcpu->gd_ipending, sizeof(mdcpu->gd_ipending));
1051 initclocks_pcpu(); /* clock interrupts (via IPIs) */
1052 lwkt_process_ipiq();
1055 * Releasing the mp lock lets the BSP finish up the SMP init
1058 KKASSERT((curthread->td_flags & TDF_RUNQ) == 0);
1062 * Get SMP fully working before we start initializing devices.
1070 kprintf("Finish MP startup\n");
1072 while (smp_active_mask != smp_startup_mask)
1074 while (try_mplock() == 0)
1077 kprintf("Active CPU Mask: %016jx\n",
1078 (uintmax_t)smp_active_mask);
1082 SYSINIT(finishsmp, SI_BOOT2_FINISH_SMP, SI_ORDER_FIRST, ap_finish, NULL)
1085 cpu_send_ipiq(int dcpu)
1087 if (CPUMASK(dcpu) & smp_active_mask)
1088 single_apic_ipi(dcpu, XIPIQ_OFFSET, APIC_DELMODE_FIXED);
1091 #if 0 /* single_apic_ipi_passive() not working yet */
1093 * Returns 0 on failure, 1 on success
1096 cpu_send_ipiq_passive(int dcpu)
1099 if (CPUMASK(dcpu) & smp_active_mask) {
1100 r = single_apic_ipi_passive(dcpu, XIPIQ_OFFSET,
1101 APIC_DELMODE_FIXED);
1108 mp_bsp_simple_setup(void)
1110 /* build our map of 'other' CPUs */
1111 mycpu->gd_other_cpus = smp_startup_mask & ~CPUMASK(mycpu->gd_cpuid);
1112 mycpu->gd_ipiq = (void *)kmem_alloc(&kernel_map, sizeof(lwkt_ipiq) * ncpus);
1113 bzero(mycpu->gd_ipiq, sizeof(lwkt_ipiq) * ncpus);
1117 if (cpu_feature & CPUID_TSC)
1118 tsc0_offset = rdtsc();
1123 * CPU TOPOLOGY DETECTION FUNCTIONS
1126 /* Detect intel topology using CPUID
1127 * Ref: http://www.intel.com/Assets/PDF/appnote/241618.pdf, pg 41
1130 detect_intel_topology(int count_htt_cores)
1134 int core_plus_logical_bits = 0;
1135 int cores_per_package;
1136 int logical_per_package;
1137 int logical_per_core;
1140 if (cpu_high >= 0xb) {
1143 } else if (cpu_high >= 0x4) {
1148 for (shift = 0; (1 << shift) < count_htt_cores; ++shift)
1150 logical_CPU_bits = 1 << shift;
1155 cpuid_count(0xb, FUNC_B_THREAD_LEVEL, p);
1157 /* if 0xb not supported - fallback to 0x4 */
1158 if (p[1] == 0 || (FUNC_B_TYPE(p[2]) != FUNC_B_THREAD_TYPE)) {
1162 logical_CPU_bits = FUNC_B_BITS_SHIFT_NEXT_LEVEL(p[0]);
1164 ecx_index = FUNC_B_THREAD_LEVEL + 1;
1166 cpuid_count(0xb, ecx_index, p);
1168 /* Check for the Core type in the implemented sub leaves. */
1169 if (FUNC_B_TYPE(p[2]) == FUNC_B_CORE_TYPE) {
1170 core_plus_logical_bits = FUNC_B_BITS_SHIFT_NEXT_LEVEL(p[0]);
1176 } while (FUNC_B_TYPE(p[2]) != FUNC_B_INVALID_TYPE);
1178 core_bits = core_plus_logical_bits - logical_CPU_bits;
1183 cpuid_count(0x4, 0, p);
1184 cores_per_package = FUNC_4_MAX_CORE_NO(p[0]) + 1;
1186 logical_per_package = count_htt_cores;
1187 logical_per_core = logical_per_package / cores_per_package;
1189 for (shift = 0; (1 << shift) < logical_per_core; ++shift)
1191 logical_CPU_bits = shift;
1193 for (shift = 0; (1 << shift) < cores_per_package; ++shift)
1200 /* Detect AMD topology using CPUID
1201 * Ref: http://support.amd.com/us/Embedded_TechDocs/25481.pdf, last page
1204 detect_amd_topology(int count_htt_cores)
1207 if ((cpu_feature & CPUID_HTT)
1208 && (amd_feature2 & AMDID2_CMP)) {
1210 if (cpu_procinfo2 & AMDID_COREID_SIZE) {
1211 core_bits = (cpu_procinfo2 & AMDID_COREID_SIZE)
1212 >> AMDID_COREID_SIZE_SHIFT;
1214 core_bits = (cpu_procinfo2 & AMDID_CMP_CORES) + 1;
1215 for (shift = 0; (1 << shift) < core_bits; ++shift)
1220 logical_CPU_bits = count_htt_cores >> core_bits;
1221 for (shift = 0; (1 << shift) < logical_CPU_bits; ++shift)
1223 logical_CPU_bits = shift;
1225 for (shift = 0; (1 << shift) < count_htt_cores; ++shift)
1228 logical_CPU_bits = 0;
1233 * - logical_CPU_bits
1235 * With the values above (for AMD or INTEL) we are able to generally
1236 * detect the CPU topology (number of cores for each level):
1237 * Ref: http://wiki.osdev.org/Detecting_CPU_Topology_(80x86)
1238 * Ref: http://www.multicoreinfo.com/research/papers/whitepapers/Intel-detect-topology.pdf
1241 detect_cpu_topology(void)
1243 static int topology_detected = 0;
1246 if (topology_detected) {
1250 if ((cpu_feature & CPUID_HTT) == 0) {
1252 logical_CPU_bits = 0;
1255 count = (cpu_procinfo & CPUID_HTT_CORES)
1256 >> CPUID_HTT_CORE_SHIFT;
1259 if (cpu_vendor_id == CPU_VENDOR_INTEL) {
1260 detect_intel_topology(count);
1261 } else if (cpu_vendor_id == CPU_VENDOR_AMD) {
1262 detect_amd_topology(count);
1267 kprintf("BITS within APICID: logical_CPU_bits: %d; core_bits: %d\n",
1268 logical_CPU_bits, core_bits);
1270 topology_detected = 1;
1273 /* Interface functions to calculate chip_ID,
1274 * core_number and logical_number
1275 * Ref: http://wiki.osdev.org/Detecting_CPU_Topology_(80x86)
1278 get_chip_ID(int cpuid)
1280 return get_apicid_from_cpuid(cpuid) >>
1281 (logical_CPU_bits + core_bits);
1285 get_core_number_within_chip(int cpuid)
1287 return (get_apicid_from_cpuid(cpuid) >> logical_CPU_bits) &
1288 ( (1 << core_bits) -1);
1292 get_logical_CPU_number_within_core(int cpuid)
1294 return get_apicid_from_cpuid(cpuid) &
1295 ( (1 << logical_CPU_bits) -1);