The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/mp_machdep.c

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    1 /*-
    2  * Copyright (c) 1996, by Steve Passe
    3  * Copyright (c) 2003, by Peter Wemm
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. The name of the developer may NOT be used to endorse or promote products
   12  *    derived from this software without specific prior written permission.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.2/sys/amd64/amd64/mp_machdep.c 281560 2015-04-15 16:52:34Z jhb $");
   29 
   30 #include "opt_cpu.h"
   31 #include "opt_ddb.h"
   32 #include "opt_kstack_pages.h"
   33 #include "opt_sched.h"
   34 #include "opt_smp.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/bus.h>
   39 #include <sys/cpuset.h>
   40 #ifdef GPROF 
   41 #include <sys/gmon.h>
   42 #endif
   43 #include <sys/kernel.h>
   44 #include <sys/ktr.h>
   45 #include <sys/lock.h>
   46 #include <sys/malloc.h>
   47 #include <sys/memrange.h>
   48 #include <sys/mutex.h>
   49 #include <sys/pcpu.h>
   50 #include <sys/proc.h>
   51 #include <sys/sched.h>
   52 #include <sys/smp.h>
   53 #include <sys/sysctl.h>
   54 
   55 #include <vm/vm.h>
   56 #include <vm/vm_param.h>
   57 #include <vm/pmap.h>
   58 #include <vm/vm_kern.h>
   59 #include <vm/vm_extern.h>
   60 
   61 #include <x86/apicreg.h>
   62 #include <machine/clock.h>
   63 #include <machine/cputypes.h>
   64 #include <machine/cpufunc.h>
   65 #include <x86/mca.h>
   66 #include <machine/md_var.h>
   67 #include <machine/pcb.h>
   68 #include <machine/psl.h>
   69 #include <machine/smp.h>
   70 #include <machine/specialreg.h>
   71 #include <machine/tss.h>
   72 #include <machine/cpu.h>
   73 
   74 #define WARMBOOT_TARGET         0
   75 #define WARMBOOT_OFF            (KERNBASE + 0x0467)
   76 #define WARMBOOT_SEG            (KERNBASE + 0x0469)
   77 
   78 #define CMOS_REG                (0x70)
   79 #define CMOS_DATA               (0x71)
   80 #define BIOS_RESET              (0x0f)
   81 #define BIOS_WARM               (0x0a)
   82 
   83 /* lock region used by kernel profiling */
   84 int     mcount_lock;
   85 
   86 int     mp_naps;                /* # of Applications processors */
   87 int     boot_cpu_id = -1;       /* designated BSP */
   88 
   89 extern  struct pcpu __pcpu[];
   90 
   91 /* AP uses this during bootstrap.  Do not staticize.  */
   92 char *bootSTK;
   93 static int bootAP;
   94 
   95 /* Free these after use */
   96 void *bootstacks[MAXCPU];
   97 
   98 /* Temporary variables for init_secondary()  */
   99 char *doublefault_stack;
  100 char *nmi_stack;
  101 void *dpcpu;
  102 
  103 struct pcb stoppcbs[MAXCPU];
  104 struct susppcb **susppcbs;
  105 
  106 /* Variables needed for SMP tlb shootdown. */
  107 vm_offset_t smp_tlb_addr2;
  108 struct invpcid_descr smp_tlb_invpcid;
  109 volatile int smp_tlb_wait;
  110 uint64_t pcid_cr3;
  111 pmap_t smp_tlb_pmap;
  112 extern int invpcid_works;
  113 
  114 #ifdef COUNT_IPIS
  115 /* Interrupt counts. */
  116 static u_long *ipi_preempt_counts[MAXCPU];
  117 static u_long *ipi_ast_counts[MAXCPU];
  118 u_long *ipi_invltlb_counts[MAXCPU];
  119 u_long *ipi_invlrng_counts[MAXCPU];
  120 u_long *ipi_invlpg_counts[MAXCPU];
  121 u_long *ipi_invlcache_counts[MAXCPU];
  122 u_long *ipi_rendezvous_counts[MAXCPU];
  123 static u_long *ipi_hardclock_counts[MAXCPU];
  124 #endif
  125 
  126 /* Default cpu_ops implementation. */
  127 struct cpu_ops cpu_ops = {
  128         .ipi_vectored = lapic_ipi_vectored
  129 };
  130 
  131 extern inthand_t IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
  132 
  133 extern int pmap_pcid_enabled;
  134 
  135 /*
  136  * Local data and functions.
  137  */
  138 
  139 static volatile cpuset_t ipi_nmi_pending;
  140 
  141 /* used to hold the AP's until we are ready to release them */
  142 static struct mtx ap_boot_mtx;
  143 
  144 /* Set to 1 once we're ready to let the APs out of the pen. */
  145 static volatile int aps_ready = 0;
  146 
  147 /*
  148  * Store data from cpu_add() until later in the boot when we actually setup
  149  * the APs.
  150  */
  151 struct cpu_info {
  152         int     cpu_present:1;
  153         int     cpu_bsp:1;
  154         int     cpu_disabled:1;
  155         int     cpu_hyperthread:1;
  156 } static cpu_info[MAX_APIC_ID + 1];
  157 int cpu_apic_ids[MAXCPU];
  158 int apic_cpuids[MAX_APIC_ID + 1];
  159 
  160 /* Holds pending bitmap based IPIs per CPU */
  161 volatile u_int cpu_ipi_pending[MAXCPU];
  162 
  163 static u_int boot_address;
  164 static int cpu_logical;                 /* logical cpus per core */
  165 static int cpu_cores;                   /* cores per package */
  166 
  167 static void     assign_cpu_ids(void);
  168 static void     set_interrupt_apic_ids(void);
  169 static int      start_all_aps(void);
  170 static int      start_ap(int apic_id);
  171 static void     release_aps(void *dummy);
  172 
  173 static u_int    hyperthreading_cpus;    /* logical cpus sharing L1 cache */
  174 static int      hyperthreading_allowed = 1;
  175 static u_int    bootMP_size;
  176 
  177 static void
  178 mem_range_AP_init(void)
  179 {
  180         if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP)
  181                 mem_range_softc.mr_op->initAP(&mem_range_softc);
  182 }
  183 
  184 static void
  185 topo_probe_amd(void)
  186 {
  187         int core_id_bits;
  188         int id;
  189 
  190         /* AMD processors do not support HTT. */
  191         cpu_logical = 1;
  192 
  193         if ((amd_feature2 & AMDID2_CMP) == 0) {
  194                 cpu_cores = 1;
  195                 return;
  196         }
  197 
  198         core_id_bits = (cpu_procinfo2 & AMDID_COREID_SIZE) >>
  199             AMDID_COREID_SIZE_SHIFT;
  200         if (core_id_bits == 0) {
  201                 cpu_cores = (cpu_procinfo2 & AMDID_CMP_CORES) + 1;
  202                 return;
  203         }
  204 
  205         /* Fam 10h and newer should get here. */
  206         for (id = 0; id <= MAX_APIC_ID; id++) {
  207                 /* Check logical CPU availability. */
  208                 if (!cpu_info[id].cpu_present || cpu_info[id].cpu_disabled)
  209                         continue;
  210                 /* Check if logical CPU has the same package ID. */
  211                 if ((id >> core_id_bits) != (boot_cpu_id >> core_id_bits))
  212                         continue;
  213                 cpu_cores++;
  214         }
  215 }
  216 
  217 /*
  218  * Round up to the next power of two, if necessary, and then
  219  * take log2.
  220  * Returns -1 if argument is zero.
  221  */
  222 static __inline int
  223 mask_width(u_int x)
  224 {
  225 
  226         return (fls(x << (1 - powerof2(x))) - 1);
  227 }
  228 
  229 static void
  230 topo_probe_0x4(void)
  231 {
  232         u_int p[4];
  233         int pkg_id_bits;
  234         int core_id_bits;
  235         int max_cores;
  236         int max_logical;
  237         int id;
  238 
  239         /* Both zero and one here mean one logical processor per package. */
  240         max_logical = (cpu_feature & CPUID_HTT) != 0 ?
  241             (cpu_procinfo & CPUID_HTT_CORES) >> 16 : 1;
  242         if (max_logical <= 1)
  243                 return;
  244 
  245         /*
  246          * Because of uniformity assumption we examine only
  247          * those logical processors that belong to the same
  248          * package as BSP.  Further, we count number of
  249          * logical processors that belong to the same core
  250          * as BSP thus deducing number of threads per core.
  251          */
  252         if (cpu_high >= 0x4) {
  253                 cpuid_count(0x04, 0, p);
  254                 max_cores = ((p[0] >> 26) & 0x3f) + 1;
  255         } else
  256                 max_cores = 1;
  257         core_id_bits = mask_width(max_logical/max_cores);
  258         if (core_id_bits < 0)
  259                 return;
  260         pkg_id_bits = core_id_bits + mask_width(max_cores);
  261 
  262         for (id = 0; id <= MAX_APIC_ID; id++) {
  263                 /* Check logical CPU availability. */
  264                 if (!cpu_info[id].cpu_present || cpu_info[id].cpu_disabled)
  265                         continue;
  266                 /* Check if logical CPU has the same package ID. */
  267                 if ((id >> pkg_id_bits) != (boot_cpu_id >> pkg_id_bits))
  268                         continue;
  269                 cpu_cores++;
  270                 /* Check if logical CPU has the same package and core IDs. */
  271                 if ((id >> core_id_bits) == (boot_cpu_id >> core_id_bits))
  272                         cpu_logical++;
  273         }
  274 
  275         KASSERT(cpu_cores >= 1 && cpu_logical >= 1,
  276             ("topo_probe_0x4 couldn't find BSP"));
  277 
  278         cpu_cores /= cpu_logical;
  279         hyperthreading_cpus = cpu_logical;
  280 }
  281 
  282 static void
  283 topo_probe_0xb(void)
  284 {
  285         u_int p[4];
  286         int bits;
  287         int cnt;
  288         int i;
  289         int logical;
  290         int type;
  291         int x;
  292 
  293         /* We only support three levels for now. */
  294         for (i = 0; i < 3; i++) {
  295                 cpuid_count(0x0b, i, p);
  296 
  297                 /* Fall back if CPU leaf 11 doesn't really exist. */
  298                 if (i == 0 && p[1] == 0) {
  299                         topo_probe_0x4();
  300                         return;
  301                 }
  302 
  303                 bits = p[0] & 0x1f;
  304                 logical = p[1] &= 0xffff;
  305                 type = (p[2] >> 8) & 0xff;
  306                 if (type == 0 || logical == 0)
  307                         break;
  308                 /*
  309                  * Because of uniformity assumption we examine only
  310                  * those logical processors that belong to the same
  311                  * package as BSP.
  312                  */
  313                 for (cnt = 0, x = 0; x <= MAX_APIC_ID; x++) {
  314                         if (!cpu_info[x].cpu_present ||
  315                             cpu_info[x].cpu_disabled)
  316                                 continue;
  317                         if (x >> bits == boot_cpu_id >> bits)
  318                                 cnt++;
  319                 }
  320                 if (type == CPUID_TYPE_SMT)
  321                         cpu_logical = cnt;
  322                 else if (type == CPUID_TYPE_CORE)
  323                         cpu_cores = cnt;
  324         }
  325         if (cpu_logical == 0)
  326                 cpu_logical = 1;
  327         cpu_cores /= cpu_logical;
  328 }
  329 
  330 /*
  331  * Both topology discovery code and code that consumes topology
  332  * information assume top-down uniformity of the topology.
  333  * That is, all physical packages must be identical and each
  334  * core in a package must have the same number of threads.
  335  * Topology information is queried only on BSP, on which this
  336  * code runs and for which it can query CPUID information.
  337  * Then topology is extrapolated on all packages using the
  338  * uniformity assumption.
  339  */
  340 static void
  341 topo_probe(void)
  342 {
  343         static int cpu_topo_probed = 0;
  344 
  345         if (cpu_topo_probed)
  346                 return;
  347 
  348         CPU_ZERO(&logical_cpus_mask);
  349         if (mp_ncpus <= 1)
  350                 cpu_cores = cpu_logical = 1;
  351         else if (cpu_vendor_id == CPU_VENDOR_AMD)
  352                 topo_probe_amd();
  353         else if (cpu_vendor_id == CPU_VENDOR_INTEL) {
  354                 /*
  355                  * See Intel(R) 64 Architecture Processor
  356                  * Topology Enumeration article for details.
  357                  *
  358                  * Note that 0x1 <= cpu_high < 4 case should be
  359                  * compatible with topo_probe_0x4() logic when
  360                  * CPUID.1:EBX[23:16] > 0 (cpu_cores will be 1)
  361                  * or it should trigger the fallback otherwise.
  362                  */
  363                 if (cpu_high >= 0xb)
  364                         topo_probe_0xb();
  365                 else if (cpu_high >= 0x1)
  366                         topo_probe_0x4();
  367         }
  368 
  369         /*
  370          * Fallback: assume each logical CPU is in separate
  371          * physical package.  That is, no multi-core, no SMT.
  372          */
  373         if (cpu_cores == 0 || cpu_logical == 0)
  374                 cpu_cores = cpu_logical = 1;
  375         cpu_topo_probed = 1;
  376 }
  377 
  378 struct cpu_group *
  379 cpu_topo(void)
  380 {
  381         int cg_flags;
  382 
  383         /*
  384          * Determine whether any threading flags are
  385          * necessry.
  386          */
  387         topo_probe();
  388         if (cpu_logical > 1 && hyperthreading_cpus)
  389                 cg_flags = CG_FLAG_HTT;
  390         else if (cpu_logical > 1)
  391                 cg_flags = CG_FLAG_SMT;
  392         else
  393                 cg_flags = 0;
  394         if (mp_ncpus % (cpu_cores * cpu_logical) != 0) {
  395                 printf("WARNING: Non-uniform processors.\n");
  396                 printf("WARNING: Using suboptimal topology.\n");
  397                 return (smp_topo_none());
  398         }
  399         /*
  400          * No multi-core or hyper-threaded.
  401          */
  402         if (cpu_logical * cpu_cores == 1)
  403                 return (smp_topo_none());
  404         /*
  405          * Only HTT no multi-core.
  406          */
  407         if (cpu_logical > 1 && cpu_cores == 1)
  408                 return (smp_topo_1level(CG_SHARE_L1, cpu_logical, cg_flags));
  409         /*
  410          * Only multi-core no HTT.
  411          */
  412         if (cpu_cores > 1 && cpu_logical == 1)
  413                 return (smp_topo_1level(CG_SHARE_L2, cpu_cores, cg_flags));
  414         /*
  415          * Both HTT and multi-core.
  416          */
  417         return (smp_topo_2level(CG_SHARE_L2, cpu_cores,
  418             CG_SHARE_L1, cpu_logical, cg_flags));
  419 }
  420 
  421 /*
  422  * Calculate usable address in base memory for AP trampoline code.
  423  */
  424 u_int
  425 mp_bootaddress(u_int basemem)
  426 {
  427 
  428         bootMP_size = mptramp_end - mptramp_start;
  429         boot_address = trunc_page(basemem * 1024); /* round down to 4k boundary */
  430         if (((basemem * 1024) - boot_address) < bootMP_size)
  431                 boot_address -= PAGE_SIZE;      /* not enough, lower by 4k */
  432         /* 3 levels of page table pages */
  433         mptramp_pagetables = boot_address - (PAGE_SIZE * 3);
  434 
  435         return mptramp_pagetables;
  436 }
  437 
  438 void
  439 cpu_add(u_int apic_id, char boot_cpu)
  440 {
  441 
  442         if (apic_id > MAX_APIC_ID) {
  443                 panic("SMP: APIC ID %d too high", apic_id);
  444                 return;
  445         }
  446         KASSERT(cpu_info[apic_id].cpu_present == 0, ("CPU %d added twice",
  447             apic_id));
  448         cpu_info[apic_id].cpu_present = 1;
  449         if (boot_cpu) {
  450                 KASSERT(boot_cpu_id == -1,
  451                     ("CPU %d claims to be BSP, but CPU %d already is", apic_id,
  452                     boot_cpu_id));
  453                 boot_cpu_id = apic_id;
  454                 cpu_info[apic_id].cpu_bsp = 1;
  455         }
  456         if (mp_ncpus < MAXCPU) {
  457                 mp_ncpus++;
  458                 mp_maxid = mp_ncpus - 1;
  459         }
  460         if (bootverbose)
  461                 printf("SMP: Added CPU %d (%s)\n", apic_id, boot_cpu ? "BSP" :
  462                     "AP");
  463 }
  464 
  465 void
  466 cpu_mp_setmaxid(void)
  467 {
  468 
  469         /*
  470          * mp_maxid should be already set by calls to cpu_add().
  471          * Just sanity check its value here.
  472          */
  473         if (mp_ncpus == 0)
  474                 KASSERT(mp_maxid == 0,
  475                     ("%s: mp_ncpus is zero, but mp_maxid is not", __func__));
  476         else if (mp_ncpus == 1)
  477                 mp_maxid = 0;
  478         else
  479                 KASSERT(mp_maxid >= mp_ncpus - 1,
  480                     ("%s: counters out of sync: max %d, count %d", __func__,
  481                         mp_maxid, mp_ncpus));
  482 }
  483 
  484 int
  485 cpu_mp_probe(void)
  486 {
  487 
  488         /*
  489          * Always record BSP in CPU map so that the mbuf init code works
  490          * correctly.
  491          */
  492         CPU_SETOF(0, &all_cpus);
  493         if (mp_ncpus == 0) {
  494                 /*
  495                  * No CPUs were found, so this must be a UP system.  Setup
  496                  * the variables to represent a system with a single CPU
  497                  * with an id of 0.
  498                  */
  499                 mp_ncpus = 1;
  500                 return (0);
  501         }
  502 
  503         /* At least one CPU was found. */
  504         if (mp_ncpus == 1) {
  505                 /*
  506                  * One CPU was found, so this must be a UP system with
  507                  * an I/O APIC.
  508                  */
  509                 mp_maxid = 0;
  510                 return (0);
  511         }
  512 
  513         /* At least two CPUs were found. */
  514         return (1);
  515 }
  516 
  517 /*
  518  * Initialize the IPI handlers and start up the AP's.
  519  */
  520 void
  521 cpu_mp_start(void)
  522 {
  523         int i;
  524 
  525         /* Initialize the logical ID to APIC ID table. */
  526         for (i = 0; i < MAXCPU; i++) {
  527                 cpu_apic_ids[i] = -1;
  528                 cpu_ipi_pending[i] = 0;
  529         }
  530 
  531         /* Install an inter-CPU IPI for TLB invalidation */
  532         if (pmap_pcid_enabled) {
  533                 setidt(IPI_INVLTLB, IDTVEC(invltlb_pcid), SDT_SYSIGT,
  534                     SEL_KPL, 0);
  535                 setidt(IPI_INVLPG, IDTVEC(invlpg_pcid), SDT_SYSIGT,
  536                     SEL_KPL, 0);
  537         } else {
  538                 setidt(IPI_INVLTLB, IDTVEC(invltlb), SDT_SYSIGT, SEL_KPL, 0);
  539                 setidt(IPI_INVLPG, IDTVEC(invlpg), SDT_SYSIGT, SEL_KPL, 0);
  540         }
  541         setidt(IPI_INVLRNG, IDTVEC(invlrng), SDT_SYSIGT, SEL_KPL, 0);
  542 
  543         /* Install an inter-CPU IPI for cache invalidation. */
  544         setidt(IPI_INVLCACHE, IDTVEC(invlcache), SDT_SYSIGT, SEL_KPL, 0);
  545 
  546         /* Install an inter-CPU IPI for all-CPU rendezvous */
  547         setidt(IPI_RENDEZVOUS, IDTVEC(rendezvous), SDT_SYSIGT, SEL_KPL, 0);
  548 
  549         /* Install generic inter-CPU IPI handler */
  550         setidt(IPI_BITMAP_VECTOR, IDTVEC(ipi_intr_bitmap_handler),
  551                SDT_SYSIGT, SEL_KPL, 0);
  552 
  553         /* Install an inter-CPU IPI for CPU stop/restart */
  554         setidt(IPI_STOP, IDTVEC(cpustop), SDT_SYSIGT, SEL_KPL, 0);
  555 
  556         /* Install an inter-CPU IPI for CPU suspend/resume */
  557         setidt(IPI_SUSPEND, IDTVEC(cpususpend), SDT_SYSIGT, SEL_KPL, 0);
  558 
  559         /* Set boot_cpu_id if needed. */
  560         if (boot_cpu_id == -1) {
  561                 boot_cpu_id = PCPU_GET(apic_id);
  562                 cpu_info[boot_cpu_id].cpu_bsp = 1;
  563         } else
  564                 KASSERT(boot_cpu_id == PCPU_GET(apic_id),
  565                     ("BSP's APIC ID doesn't match boot_cpu_id"));
  566 
  567         /* Probe logical/physical core configuration. */
  568         topo_probe();
  569 
  570         assign_cpu_ids();
  571 
  572         /* Start each Application Processor */
  573         start_all_aps();
  574 
  575         set_interrupt_apic_ids();
  576 }
  577 
  578 
  579 /*
  580  * Print various information about the SMP system hardware and setup.
  581  */
  582 void
  583 cpu_mp_announce(void)
  584 {
  585         const char *hyperthread;
  586         int i;
  587 
  588         printf("FreeBSD/SMP: %d package(s) x %d core(s)",
  589             mp_ncpus / (cpu_cores * cpu_logical), cpu_cores);
  590         if (hyperthreading_cpus > 1)
  591             printf(" x %d HTT threads", cpu_logical);
  592         else if (cpu_logical > 1)
  593             printf(" x %d SMT threads", cpu_logical);
  594         printf("\n");
  595 
  596         /* List active CPUs first. */
  597         printf(" cpu0 (BSP): APIC ID: %2d\n", boot_cpu_id);
  598         for (i = 1; i < mp_ncpus; i++) {
  599                 if (cpu_info[cpu_apic_ids[i]].cpu_hyperthread)
  600                         hyperthread = "/HT";
  601                 else
  602                         hyperthread = "";
  603                 printf(" cpu%d (AP%s): APIC ID: %2d\n", i, hyperthread,
  604                     cpu_apic_ids[i]);
  605         }
  606 
  607         /* List disabled CPUs last. */
  608         for (i = 0; i <= MAX_APIC_ID; i++) {
  609                 if (!cpu_info[i].cpu_present || !cpu_info[i].cpu_disabled)
  610                         continue;
  611                 if (cpu_info[i].cpu_hyperthread)
  612                         hyperthread = "/HT";
  613                 else
  614                         hyperthread = "";
  615                 printf("  cpu (AP%s): APIC ID: %2d (disabled)\n", hyperthread,
  616                     i);
  617         }
  618 }
  619 
  620 /*
  621  * AP CPU's call this to initialize themselves.
  622  */
  623 void
  624 init_secondary(void)
  625 {
  626         struct pcpu *pc;
  627         struct nmi_pcpu *np;
  628         u_int64_t msr, cr0;
  629         u_int cpuid;
  630         int cpu, gsel_tss, x;
  631         struct region_descriptor ap_gdt;
  632 
  633         /* Set by the startup code for us to use */
  634         cpu = bootAP;
  635 
  636         /* Init tss */
  637         common_tss[cpu] = common_tss[0];
  638         common_tss[cpu].tss_rsp0 = 0;   /* not used until after switch */
  639         common_tss[cpu].tss_iobase = sizeof(struct amd64tss) +
  640             IOPAGES * PAGE_SIZE;
  641         common_tss[cpu].tss_ist1 = (long)&doublefault_stack[PAGE_SIZE];
  642 
  643         /* The NMI stack runs on IST2. */
  644         np = ((struct nmi_pcpu *) &nmi_stack[PAGE_SIZE]) - 1;
  645         common_tss[cpu].tss_ist2 = (long) np;
  646 
  647         /* Prepare private GDT */
  648         gdt_segs[GPROC0_SEL].ssd_base = (long) &common_tss[cpu];
  649         for (x = 0; x < NGDT; x++) {
  650                 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1) &&
  651                     x != GUSERLDT_SEL && x != (GUSERLDT_SEL + 1))
  652                         ssdtosd(&gdt_segs[x], &gdt[NGDT * cpu + x]);
  653         }
  654         ssdtosyssd(&gdt_segs[GPROC0_SEL],
  655             (struct system_segment_descriptor *)&gdt[NGDT * cpu + GPROC0_SEL]);
  656         ap_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
  657         ap_gdt.rd_base =  (long) &gdt[NGDT * cpu];
  658         lgdt(&ap_gdt);                  /* does magic intra-segment return */
  659 
  660         /* Get per-cpu data */
  661         pc = &__pcpu[cpu];
  662 
  663         /* prime data page for it to use */
  664         pcpu_init(pc, cpu, sizeof(struct pcpu));
  665         dpcpu_init(dpcpu, cpu);
  666         pc->pc_apic_id = cpu_apic_ids[cpu];
  667         pc->pc_prvspace = pc;
  668         pc->pc_curthread = 0;
  669         pc->pc_tssp = &common_tss[cpu];
  670         pc->pc_commontssp = &common_tss[cpu];
  671         pc->pc_rsp0 = 0;
  672         pc->pc_tss = (struct system_segment_descriptor *)&gdt[NGDT * cpu +
  673             GPROC0_SEL];
  674         pc->pc_fs32p = &gdt[NGDT * cpu + GUFS32_SEL];
  675         pc->pc_gs32p = &gdt[NGDT * cpu + GUGS32_SEL];
  676         pc->pc_ldt = (struct system_segment_descriptor *)&gdt[NGDT * cpu +
  677             GUSERLDT_SEL];
  678 
  679         /* Save the per-cpu pointer for use by the NMI handler. */
  680         np->np_pcpu = (register_t) pc;
  681 
  682         wrmsr(MSR_FSBASE, 0);           /* User value */
  683         wrmsr(MSR_GSBASE, (u_int64_t)pc);
  684         wrmsr(MSR_KGSBASE, (u_int64_t)pc);      /* XXX User value while we're in the kernel */
  685 
  686         lidt(&r_idt);
  687 
  688         gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
  689         ltr(gsel_tss);
  690 
  691         /*
  692          * Set to a known state:
  693          * Set by mpboot.s: CR0_PG, CR0_PE
  694          * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
  695          */
  696         cr0 = rcr0();
  697         cr0 &= ~(CR0_CD | CR0_NW | CR0_EM);
  698         load_cr0(cr0);
  699 
  700         /* Set up the fast syscall stuff */
  701         msr = rdmsr(MSR_EFER) | EFER_SCE;
  702         wrmsr(MSR_EFER, msr);
  703         wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
  704         wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
  705         msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) |
  706               ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48);
  707         wrmsr(MSR_STAR, msr);
  708         wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D);
  709 
  710         /* Disable local APIC just to be sure. */
  711         lapic_disable();
  712 
  713         /* signal our startup to the BSP. */
  714         mp_naps++;
  715 
  716         /* Spin until the BSP releases the AP's. */
  717         while (!aps_ready)
  718                 ia32_pause();
  719 
  720         /* Initialize the PAT MSR. */
  721         pmap_init_pat();
  722 
  723         /* set up CPU registers and state */
  724         cpu_setregs();
  725 
  726         /* set up SSE/NX */
  727         initializecpu();
  728 
  729         /* set up FPU state on the AP */
  730         fpuinit();
  731 
  732         if (cpu_ops.cpu_init)
  733                 cpu_ops.cpu_init();
  734 
  735         /* A quick check from sanity claus */
  736         cpuid = PCPU_GET(cpuid);
  737         if (PCPU_GET(apic_id) != lapic_id()) {
  738                 printf("SMP: cpuid = %d\n", cpuid);
  739                 printf("SMP: actual apic_id = %d\n", lapic_id());
  740                 printf("SMP: correct apic_id = %d\n", PCPU_GET(apic_id));
  741                 panic("cpuid mismatch! boom!!");
  742         }
  743 
  744         /* Initialize curthread. */
  745         KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread"));
  746         PCPU_SET(curthread, PCPU_GET(idlethread));
  747 
  748         mca_init();
  749 
  750         mtx_lock_spin(&ap_boot_mtx);
  751 
  752         /* Init local apic for irq's */
  753         lapic_setup(1);
  754 
  755         /* Set memory range attributes for this CPU to match the BSP */
  756         mem_range_AP_init();
  757 
  758         smp_cpus++;
  759 
  760         CTR1(KTR_SMP, "SMP: AP CPU #%d Launched", cpuid);
  761         printf("SMP: AP CPU #%d Launched!\n", cpuid);
  762 
  763         /* Determine if we are a logical CPU. */
  764         /* XXX Calculation depends on cpu_logical being a power of 2, e.g. 2 */
  765         if (cpu_logical > 1 && PCPU_GET(apic_id) % cpu_logical != 0)
  766                 CPU_SET(cpuid, &logical_cpus_mask);
  767 
  768         if (bootverbose)
  769                 lapic_dump("AP");
  770 
  771         if (smp_cpus == mp_ncpus) {
  772                 /* enable IPI's, tlb shootdown, freezes etc */
  773                 atomic_store_rel_int(&smp_started, 1);
  774         }
  775 
  776         /*
  777          * Enable global pages TLB extension
  778          * This also implicitly flushes the TLB 
  779          */
  780 
  781         load_cr4(rcr4() | CR4_PGE);
  782         if (pmap_pcid_enabled)
  783                 load_cr4(rcr4() | CR4_PCIDE);
  784         load_ds(_udatasel);
  785         load_es(_udatasel);
  786         load_fs(_ufssel);
  787         mtx_unlock_spin(&ap_boot_mtx);
  788 
  789         /* Wait until all the AP's are up. */
  790         while (smp_started == 0)
  791                 ia32_pause();
  792 
  793         /* Start per-CPU event timers. */
  794         cpu_initclocks_ap();
  795 
  796         sched_throw(NULL);
  797 
  798         panic("scheduler returned us to %s", __func__);
  799         /* NOTREACHED */
  800 }
  801 
  802 /*******************************************************************
  803  * local functions and data
  804  */
  805 
  806 /*
  807  * We tell the I/O APIC code about all the CPUs we want to receive
  808  * interrupts.  If we don't want certain CPUs to receive IRQs we
  809  * can simply not tell the I/O APIC code about them in this function.
  810  * We also do not tell it about the BSP since it tells itself about
  811  * the BSP internally to work with UP kernels and on UP machines.
  812  */
  813 static void
  814 set_interrupt_apic_ids(void)
  815 {
  816         u_int i, apic_id;
  817 
  818         for (i = 0; i < MAXCPU; i++) {
  819                 apic_id = cpu_apic_ids[i];
  820                 if (apic_id == -1)
  821                         continue;
  822                 if (cpu_info[apic_id].cpu_bsp)
  823                         continue;
  824                 if (cpu_info[apic_id].cpu_disabled)
  825                         continue;
  826 
  827                 /* Don't let hyperthreads service interrupts. */
  828                 if (hyperthreading_cpus > 1 &&
  829                     apic_id % hyperthreading_cpus != 0)
  830                         continue;
  831 
  832                 intr_add_cpu(i);
  833         }
  834 }
  835 
  836 /*
  837  * Assign logical CPU IDs to local APICs.
  838  */
  839 static void
  840 assign_cpu_ids(void)
  841 {
  842         u_int i;
  843 
  844         TUNABLE_INT_FETCH("machdep.hyperthreading_allowed",
  845             &hyperthreading_allowed);
  846 
  847         /* Check for explicitly disabled CPUs. */
  848         for (i = 0; i <= MAX_APIC_ID; i++) {
  849                 if (!cpu_info[i].cpu_present || cpu_info[i].cpu_bsp)
  850                         continue;
  851 
  852                 if (hyperthreading_cpus > 1 && i % hyperthreading_cpus != 0) {
  853                         cpu_info[i].cpu_hyperthread = 1;
  854 
  855                         /*
  856                          * Don't use HT CPU if it has been disabled by a
  857                          * tunable.
  858                          */
  859                         if (hyperthreading_allowed == 0) {
  860                                 cpu_info[i].cpu_disabled = 1;
  861                                 continue;
  862                         }
  863                 }
  864 
  865                 /* Don't use this CPU if it has been disabled by a tunable. */
  866                 if (resource_disabled("lapic", i)) {
  867                         cpu_info[i].cpu_disabled = 1;
  868                         continue;
  869                 }
  870         }
  871 
  872         if (hyperthreading_allowed == 0 && hyperthreading_cpus > 1) {
  873                 hyperthreading_cpus = 0;
  874                 cpu_logical = 1;
  875         }
  876 
  877         /*
  878          * Assign CPU IDs to local APIC IDs and disable any CPUs
  879          * beyond MAXCPU.  CPU 0 is always assigned to the BSP.
  880          *
  881          * To minimize confusion for userland, we attempt to number
  882          * CPUs such that all threads and cores in a package are
  883          * grouped together.  For now we assume that the BSP is always
  884          * the first thread in a package and just start adding APs
  885          * starting with the BSP's APIC ID.
  886          */
  887         mp_ncpus = 1;
  888         cpu_apic_ids[0] = boot_cpu_id;
  889         apic_cpuids[boot_cpu_id] = 0;
  890         for (i = boot_cpu_id + 1; i != boot_cpu_id;
  891              i == MAX_APIC_ID ? i = 0 : i++) {
  892                 if (!cpu_info[i].cpu_present || cpu_info[i].cpu_bsp ||
  893                     cpu_info[i].cpu_disabled)
  894                         continue;
  895 
  896                 if (mp_ncpus < MAXCPU) {
  897                         cpu_apic_ids[mp_ncpus] = i;
  898                         apic_cpuids[i] = mp_ncpus;
  899                         mp_ncpus++;
  900                 } else
  901                         cpu_info[i].cpu_disabled = 1;
  902         }
  903         KASSERT(mp_maxid >= mp_ncpus - 1,
  904             ("%s: counters out of sync: max %d, count %d", __func__, mp_maxid,
  905             mp_ncpus));         
  906 }
  907 
  908 /*
  909  * start each AP in our list
  910  */
  911 static int
  912 start_all_aps(void)
  913 {
  914         vm_offset_t va = boot_address + KERNBASE;
  915         u_int64_t *pt4, *pt3, *pt2;
  916         u_int32_t mpbioswarmvec;
  917         int apic_id, cpu, i;
  918         u_char mpbiosreason;
  919 
  920         mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
  921 
  922         /* install the AP 1st level boot code */
  923         pmap_kenter(va, boot_address);
  924         pmap_invalidate_page(kernel_pmap, va);
  925         bcopy(mptramp_start, (void *)va, bootMP_size);
  926 
  927         /* Locate the page tables, they'll be below the trampoline */
  928         pt4 = (u_int64_t *)(uintptr_t)(mptramp_pagetables + KERNBASE);
  929         pt3 = pt4 + (PAGE_SIZE) / sizeof(u_int64_t);
  930         pt2 = pt3 + (PAGE_SIZE) / sizeof(u_int64_t);
  931 
  932         /* Create the initial 1GB replicated page tables */
  933         for (i = 0; i < 512; i++) {
  934                 /* Each slot of the level 4 pages points to the same level 3 page */
  935                 pt4[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + PAGE_SIZE);
  936                 pt4[i] |= PG_V | PG_RW | PG_U;
  937 
  938                 /* Each slot of the level 3 pages points to the same level 2 page */
  939                 pt3[i] = (u_int64_t)(uintptr_t)(mptramp_pagetables + (2 * PAGE_SIZE));
  940                 pt3[i] |= PG_V | PG_RW | PG_U;
  941 
  942                 /* The level 2 page slots are mapped with 2MB pages for 1GB. */
  943                 pt2[i] = i * (2 * 1024 * 1024);
  944                 pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
  945         }
  946 
  947         /* save the current value of the warm-start vector */
  948         mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
  949         outb(CMOS_REG, BIOS_RESET);
  950         mpbiosreason = inb(CMOS_DATA);
  951 
  952         /* setup a vector to our boot code */
  953         *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
  954         *((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
  955         outb(CMOS_REG, BIOS_RESET);
  956         outb(CMOS_DATA, BIOS_WARM);     /* 'warm-start' */
  957 
  958         /* start each AP */
  959         for (cpu = 1; cpu < mp_ncpus; cpu++) {
  960                 apic_id = cpu_apic_ids[cpu];
  961 
  962                 /* allocate and set up an idle stack data page */
  963                 bootstacks[cpu] = (void *)kmem_malloc(kernel_arena,
  964                     KSTACK_PAGES * PAGE_SIZE, M_WAITOK | M_ZERO);
  965                 doublefault_stack = (char *)kmem_malloc(kernel_arena,
  966                     PAGE_SIZE, M_WAITOK | M_ZERO);
  967                 nmi_stack = (char *)kmem_malloc(kernel_arena, PAGE_SIZE,
  968                     M_WAITOK | M_ZERO);
  969                 dpcpu = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
  970                     M_WAITOK | M_ZERO);
  971 
  972                 bootSTK = (char *)bootstacks[cpu] + KSTACK_PAGES * PAGE_SIZE - 8;
  973                 bootAP = cpu;
  974 
  975                 /* attempt to start the Application Processor */
  976                 if (!start_ap(apic_id)) {
  977                         /* restore the warmstart vector */
  978                         *(u_int32_t *) WARMBOOT_OFF = mpbioswarmvec;
  979                         panic("AP #%d (PHY# %d) failed!", cpu, apic_id);
  980                 }
  981 
  982                 CPU_SET(cpu, &all_cpus);        /* record AP in CPU map */
  983         }
  984 
  985         /* restore the warmstart vector */
  986         *(u_int32_t *) WARMBOOT_OFF = mpbioswarmvec;
  987 
  988         outb(CMOS_REG, BIOS_RESET);
  989         outb(CMOS_DATA, mpbiosreason);
  990 
  991         /* number of APs actually started */
  992         return mp_naps;
  993 }
  994 
  995 
  996 /*
  997  * This function starts the AP (application processor) identified
  998  * by the APIC ID 'physicalCpu'.  It does quite a "song and dance"
  999  * to accomplish this.  This is necessary because of the nuances
 1000  * of the different hardware we might encounter.  It isn't pretty,
 1001  * but it seems to work.
 1002  */
 1003 static int
 1004 start_ap(int apic_id)
 1005 {
 1006         int vector, ms;
 1007         int cpus;
 1008 
 1009         /* calculate the vector */
 1010         vector = (boot_address >> 12) & 0xff;
 1011 
 1012         /* used as a watchpoint to signal AP startup */
 1013         cpus = mp_naps;
 1014 
 1015         ipi_startup(apic_id, vector);
 1016 
 1017         /* Wait up to 5 seconds for it to start. */
 1018         for (ms = 0; ms < 5000; ms++) {
 1019                 if (mp_naps > cpus)
 1020                         return 1;       /* return SUCCESS */
 1021                 DELAY(1000);
 1022         }
 1023         return 0;               /* return FAILURE */
 1024 }
 1025 
 1026 #ifdef COUNT_XINVLTLB_HITS
 1027 u_int xhits_gbl[MAXCPU];
 1028 u_int xhits_pg[MAXCPU];
 1029 u_int xhits_rng[MAXCPU];
 1030 static SYSCTL_NODE(_debug, OID_AUTO, xhits, CTLFLAG_RW, 0, "");
 1031 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, global, CTLFLAG_RW, &xhits_gbl,
 1032     sizeof(xhits_gbl), "IU", "");
 1033 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, page, CTLFLAG_RW, &xhits_pg,
 1034     sizeof(xhits_pg), "IU", "");
 1035 SYSCTL_OPAQUE(_debug_xhits, OID_AUTO, range, CTLFLAG_RW, &xhits_rng,
 1036     sizeof(xhits_rng), "IU", "");
 1037 
 1038 u_int ipi_global;
 1039 u_int ipi_page;
 1040 u_int ipi_range;
 1041 u_int ipi_range_size;
 1042 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_global, CTLFLAG_RW, &ipi_global, 0, "");
 1043 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_page, CTLFLAG_RW, &ipi_page, 0, "");
 1044 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_range, CTLFLAG_RW, &ipi_range, 0, "");
 1045 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_range_size, CTLFLAG_RW,
 1046     &ipi_range_size, 0, "");
 1047 
 1048 u_int ipi_masked_global;
 1049 u_int ipi_masked_page;
 1050 u_int ipi_masked_range;
 1051 u_int ipi_masked_range_size;
 1052 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_masked_global, CTLFLAG_RW,
 1053     &ipi_masked_global, 0, "");
 1054 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_masked_page, CTLFLAG_RW,
 1055     &ipi_masked_page, 0, "");
 1056 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_masked_range, CTLFLAG_RW,
 1057     &ipi_masked_range, 0, "");
 1058 SYSCTL_UINT(_debug_xhits, OID_AUTO, ipi_masked_range_size, CTLFLAG_RW,
 1059     &ipi_masked_range_size, 0, "");
 1060 #endif /* COUNT_XINVLTLB_HITS */
 1061 
 1062 /*
 1063  * Init and startup IPI.
 1064  */
 1065 void
 1066 ipi_startup(int apic_id, int vector)
 1067 {
 1068 
 1069         /*
 1070          * This attempts to follow the algorithm described in the
 1071          * Intel Multiprocessor Specification v1.4 in section B.4.
 1072          * For each IPI, we allow the local APIC ~20us to deliver the
 1073          * IPI.  If that times out, we panic.
 1074          */
 1075 
 1076         /*
 1077          * first we do an INIT IPI: this INIT IPI might be run, resetting
 1078          * and running the target CPU. OR this INIT IPI might be latched (P5
 1079          * bug), CPU waiting for STARTUP IPI. OR this INIT IPI might be
 1080          * ignored.
 1081          */
 1082         lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_LEVEL |
 1083             APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, apic_id);
 1084         lapic_ipi_wait(100);
 1085 
 1086         /* Explicitly deassert the INIT IPI. */
 1087         lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_LEVEL |
 1088             APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT,
 1089             apic_id);
 1090 
 1091         DELAY(10000);           /* wait ~10mS */
 1092 
 1093         /*
 1094          * next we do a STARTUP IPI: the previous INIT IPI might still be
 1095          * latched, (P5 bug) this 1st STARTUP would then terminate
 1096          * immediately, and the previously started INIT IPI would continue. OR
 1097          * the previous INIT IPI has already run. and this STARTUP IPI will
 1098          * run. OR the previous INIT IPI was ignored. and this STARTUP IPI
 1099          * will run.
 1100          */
 1101         lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
 1102             APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
 1103             vector, apic_id);
 1104         if (!lapic_ipi_wait(100))
 1105                 panic("Failed to deliver first STARTUP IPI to APIC %d",
 1106                     apic_id);
 1107         DELAY(200);             /* wait ~200uS */
 1108 
 1109         /*
 1110          * finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF
 1111          * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR
 1112          * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is
 1113          * recognized after hardware RESET or INIT IPI.
 1114          */
 1115         lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
 1116             APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
 1117             vector, apic_id);
 1118         if (!lapic_ipi_wait(100))
 1119                 panic("Failed to deliver second STARTUP IPI to APIC %d",
 1120                     apic_id);
 1121 
 1122         DELAY(200);             /* wait ~200uS */
 1123 }
 1124 
 1125 /*
 1126  * Send an IPI to specified CPU handling the bitmap logic.
 1127  */
 1128 static void
 1129 ipi_send_cpu(int cpu, u_int ipi)
 1130 {
 1131         u_int bitmap, old_pending, new_pending;
 1132 
 1133         KASSERT(cpu_apic_ids[cpu] != -1, ("IPI to non-existent CPU %d", cpu));
 1134 
 1135         if (IPI_IS_BITMAPED(ipi)) {
 1136                 bitmap = 1 << ipi;
 1137                 ipi = IPI_BITMAP_VECTOR;
 1138                 do {
 1139                         old_pending = cpu_ipi_pending[cpu];
 1140                         new_pending = old_pending | bitmap;
 1141                 } while  (!atomic_cmpset_int(&cpu_ipi_pending[cpu],
 1142                     old_pending, new_pending)); 
 1143                 if (old_pending)
 1144                         return;
 1145         }
 1146         cpu_ops.ipi_vectored(ipi, cpu_apic_ids[cpu]);
 1147 }
 1148 
 1149 /*
 1150  * Flush the TLB on all other CPU's
 1151  */
 1152 static void
 1153 smp_tlb_shootdown(u_int vector, pmap_t pmap, vm_offset_t addr1,
 1154     vm_offset_t addr2)
 1155 {
 1156         u_int ncpu;
 1157 
 1158         ncpu = mp_ncpus - 1;    /* does not shootdown self */
 1159         if (ncpu < 1)
 1160                 return;         /* no other cpus */
 1161         if (!(read_rflags() & PSL_I))
 1162                 panic("%s: interrupts disabled", __func__);
 1163         mtx_lock_spin(&smp_ipi_mtx);
 1164         smp_tlb_invpcid.addr = addr1;
 1165         if (pmap == NULL) {
 1166                 smp_tlb_invpcid.pcid = 0;
 1167         } else {
 1168                 smp_tlb_invpcid.pcid = pmap->pm_pcid;
 1169                 pcid_cr3 = pmap->pm_cr3;
 1170         }
 1171         smp_tlb_addr2 = addr2;
 1172         smp_tlb_pmap = pmap;
 1173         atomic_store_rel_int(&smp_tlb_wait, 0);
 1174         ipi_all_but_self(vector);
 1175         while (smp_tlb_wait < ncpu)
 1176                 ia32_pause();
 1177         mtx_unlock_spin(&smp_ipi_mtx);
 1178 }
 1179 
 1180 static void
 1181 smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, pmap_t pmap,
 1182     vm_offset_t addr1, vm_offset_t addr2)
 1183 {
 1184         int cpu, ncpu, othercpus;
 1185 
 1186         othercpus = mp_ncpus - 1;
 1187         if (CPU_ISFULLSET(&mask)) {
 1188                 if (othercpus < 1)
 1189                         return;
 1190         } else {
 1191                 CPU_CLR(PCPU_GET(cpuid), &mask);
 1192                 if (CPU_EMPTY(&mask))
 1193                         return;
 1194         }
 1195         if (!(read_rflags() & PSL_I))
 1196                 panic("%s: interrupts disabled", __func__);
 1197         mtx_lock_spin(&smp_ipi_mtx);
 1198         smp_tlb_invpcid.addr = addr1;
 1199         if (pmap == NULL) {
 1200                 smp_tlb_invpcid.pcid = 0;
 1201         } else {
 1202                 smp_tlb_invpcid.pcid = pmap->pm_pcid;
 1203                 pcid_cr3 = pmap->pm_cr3;
 1204         }
 1205         smp_tlb_addr2 = addr2;
 1206         smp_tlb_pmap = pmap;
 1207         atomic_store_rel_int(&smp_tlb_wait, 0);
 1208         if (CPU_ISFULLSET(&mask)) {
 1209                 ncpu = othercpus;
 1210                 ipi_all_but_self(vector);
 1211         } else {
 1212                 ncpu = 0;
 1213                 while ((cpu = CPU_FFS(&mask)) != 0) {
 1214                         cpu--;
 1215                         CPU_CLR(cpu, &mask);
 1216                         CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__,
 1217                             cpu, vector);
 1218                         ipi_send_cpu(cpu, vector);
 1219                         ncpu++;
 1220                 }
 1221         }
 1222         while (smp_tlb_wait < ncpu)
 1223                 ia32_pause();
 1224         mtx_unlock_spin(&smp_ipi_mtx);
 1225 }
 1226 
 1227 void
 1228 smp_cache_flush(void)
 1229 {
 1230 
 1231         if (smp_started)
 1232                 smp_tlb_shootdown(IPI_INVLCACHE, NULL, 0, 0);
 1233 }
 1234 
 1235 void
 1236 smp_invltlb(pmap_t pmap)
 1237 {
 1238 
 1239         if (smp_started) {
 1240                 smp_tlb_shootdown(IPI_INVLTLB, pmap, 0, 0);
 1241 #ifdef COUNT_XINVLTLB_HITS
 1242                 ipi_global++;
 1243 #endif
 1244         }
 1245 }
 1246 
 1247 void
 1248 smp_invlpg(pmap_t pmap, vm_offset_t addr)
 1249 {
 1250 
 1251         if (smp_started) {
 1252                 smp_tlb_shootdown(IPI_INVLPG, pmap, addr, 0);
 1253 #ifdef COUNT_XINVLTLB_HITS
 1254                 ipi_page++;
 1255 #endif
 1256         }
 1257 }
 1258 
 1259 void
 1260 smp_invlpg_range(pmap_t pmap, vm_offset_t addr1, vm_offset_t addr2)
 1261 {
 1262 
 1263         if (smp_started) {
 1264                 smp_tlb_shootdown(IPI_INVLRNG, pmap, addr1, addr2);
 1265 #ifdef COUNT_XINVLTLB_HITS
 1266                 ipi_range++;
 1267                 ipi_range_size += (addr2 - addr1) / PAGE_SIZE;
 1268 #endif
 1269         }
 1270 }
 1271 
 1272 void
 1273 smp_masked_invltlb(cpuset_t mask, pmap_t pmap)
 1274 {
 1275 
 1276         if (smp_started) {
 1277                 smp_targeted_tlb_shootdown(mask, IPI_INVLTLB, pmap, 0, 0);
 1278 #ifdef COUNT_XINVLTLB_HITS
 1279                 ipi_masked_global++;
 1280 #endif
 1281         }
 1282 }
 1283 
 1284 void
 1285 smp_masked_invlpg(cpuset_t mask, pmap_t pmap, vm_offset_t addr)
 1286 {
 1287 
 1288         if (smp_started) {
 1289                 smp_targeted_tlb_shootdown(mask, IPI_INVLPG, pmap, addr, 0);
 1290 #ifdef COUNT_XINVLTLB_HITS
 1291                 ipi_masked_page++;
 1292 #endif
 1293         }
 1294 }
 1295 
 1296 void
 1297 smp_masked_invlpg_range(cpuset_t mask, pmap_t pmap, vm_offset_t addr1,
 1298     vm_offset_t addr2)
 1299 {
 1300 
 1301         if (smp_started) {
 1302                 smp_targeted_tlb_shootdown(mask, IPI_INVLRNG, pmap, addr1,
 1303                     addr2);
 1304 #ifdef COUNT_XINVLTLB_HITS
 1305                 ipi_masked_range++;
 1306                 ipi_masked_range_size += (addr2 - addr1) / PAGE_SIZE;
 1307 #endif
 1308         }
 1309 }
 1310 
 1311 void
 1312 ipi_bitmap_handler(struct trapframe frame)
 1313 {
 1314         struct trapframe *oldframe;
 1315         struct thread *td;
 1316         int cpu = PCPU_GET(cpuid);
 1317         u_int ipi_bitmap;
 1318 
 1319         critical_enter();
 1320         td = curthread;
 1321         td->td_intr_nesting_level++;
 1322         oldframe = td->td_intr_frame;
 1323         td->td_intr_frame = &frame;
 1324         ipi_bitmap = atomic_readandclear_int(&cpu_ipi_pending[cpu]);
 1325         if (ipi_bitmap & (1 << IPI_PREEMPT)) {
 1326 #ifdef COUNT_IPIS
 1327                 (*ipi_preempt_counts[cpu])++;
 1328 #endif
 1329                 sched_preempt(td);
 1330         }
 1331         if (ipi_bitmap & (1 << IPI_AST)) {
 1332 #ifdef COUNT_IPIS
 1333                 (*ipi_ast_counts[cpu])++;
 1334 #endif
 1335                 /* Nothing to do for AST */
 1336         }
 1337         if (ipi_bitmap & (1 << IPI_HARDCLOCK)) {
 1338 #ifdef COUNT_IPIS
 1339                 (*ipi_hardclock_counts[cpu])++;
 1340 #endif
 1341                 hardclockintr();
 1342         }
 1343         td->td_intr_frame = oldframe;
 1344         td->td_intr_nesting_level--;
 1345         critical_exit();
 1346 }
 1347 
 1348 /*
 1349  * send an IPI to a set of cpus.
 1350  */
 1351 void
 1352 ipi_selected(cpuset_t cpus, u_int ipi)
 1353 {
 1354         int cpu;
 1355 
 1356         /*
 1357          * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
 1358          * of help in order to understand what is the source.
 1359          * Set the mask of receiving CPUs for this purpose.
 1360          */
 1361         if (ipi == IPI_STOP_HARD)
 1362                 CPU_OR_ATOMIC(&ipi_nmi_pending, &cpus);
 1363 
 1364         while ((cpu = CPU_FFS(&cpus)) != 0) {
 1365                 cpu--;
 1366                 CPU_CLR(cpu, &cpus);
 1367                 CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
 1368                 ipi_send_cpu(cpu, ipi);
 1369         }
 1370 }
 1371 
 1372 /*
 1373  * send an IPI to a specific CPU.
 1374  */
 1375 void
 1376 ipi_cpu(int cpu, u_int ipi)
 1377 {
 1378 
 1379         /*
 1380          * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
 1381          * of help in order to understand what is the source.
 1382          * Set the mask of receiving CPUs for this purpose.
 1383          */
 1384         if (ipi == IPI_STOP_HARD)
 1385                 CPU_SET_ATOMIC(cpu, &ipi_nmi_pending);
 1386 
 1387         CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
 1388         ipi_send_cpu(cpu, ipi);
 1389 }
 1390 
 1391 /*
 1392  * send an IPI to all CPUs EXCEPT myself
 1393  */
 1394 void
 1395 ipi_all_but_self(u_int ipi)
 1396 {
 1397         cpuset_t other_cpus;
 1398 
 1399         other_cpus = all_cpus;
 1400         CPU_CLR(PCPU_GET(cpuid), &other_cpus);
 1401 
 1402         if (IPI_IS_BITMAPED(ipi)) {
 1403                 ipi_selected(other_cpus, ipi);
 1404                 return;
 1405         }
 1406 
 1407         /*
 1408          * IPI_STOP_HARD maps to a NMI and the trap handler needs a bit
 1409          * of help in order to understand what is the source.
 1410          * Set the mask of receiving CPUs for this purpose.
 1411          */
 1412         if (ipi == IPI_STOP_HARD)
 1413                 CPU_OR_ATOMIC(&ipi_nmi_pending, &other_cpus);
 1414 
 1415         CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
 1416         cpu_ops.ipi_vectored(ipi, APIC_IPI_DEST_OTHERS);
 1417 }
 1418 
 1419 int
 1420 ipi_nmi_handler()
 1421 {
 1422         u_int cpuid;
 1423 
 1424         /*
 1425          * As long as there is not a simple way to know about a NMI's
 1426          * source, if the bitmask for the current CPU is present in
 1427          * the global pending bitword an IPI_STOP_HARD has been issued
 1428          * and should be handled.
 1429          */
 1430         cpuid = PCPU_GET(cpuid);
 1431         if (!CPU_ISSET(cpuid, &ipi_nmi_pending))
 1432                 return (1);
 1433 
 1434         CPU_CLR_ATOMIC(cpuid, &ipi_nmi_pending);
 1435         cpustop_handler();
 1436         return (0);
 1437 }
 1438      
 1439 /*
 1440  * Handle an IPI_STOP by saving our current context and spinning until we
 1441  * are resumed.
 1442  */
 1443 void
 1444 cpustop_handler(void)
 1445 {
 1446         u_int cpu;
 1447 
 1448         cpu = PCPU_GET(cpuid);
 1449 
 1450         savectx(&stoppcbs[cpu]);
 1451 
 1452         /* Indicate that we are stopped */
 1453         CPU_SET_ATOMIC(cpu, &stopped_cpus);
 1454 
 1455         /* Wait for restart */
 1456         while (!CPU_ISSET(cpu, &started_cpus))
 1457             ia32_pause();
 1458 
 1459         CPU_CLR_ATOMIC(cpu, &started_cpus);
 1460         CPU_CLR_ATOMIC(cpu, &stopped_cpus);
 1461 
 1462 #ifdef DDB
 1463         amd64_db_resume_dbreg();
 1464 #endif
 1465 
 1466         if (cpu == 0 && cpustop_restartfunc != NULL) {
 1467                 cpustop_restartfunc();
 1468                 cpustop_restartfunc = NULL;
 1469         }
 1470 }
 1471 
 1472 /*
 1473  * Handle an IPI_SUSPEND by saving our current context and spinning until we
 1474  * are resumed.
 1475  */
 1476 void
 1477 cpususpend_handler(void)
 1478 {
 1479         u_int cpu;
 1480 
 1481         mtx_assert(&smp_ipi_mtx, MA_NOTOWNED);
 1482 
 1483         cpu = PCPU_GET(cpuid);
 1484         if (savectx(&susppcbs[cpu]->sp_pcb)) {
 1485                 fpususpend(susppcbs[cpu]->sp_fpususpend);
 1486                 wbinvd();
 1487                 CPU_SET_ATOMIC(cpu, &suspended_cpus);
 1488         } else {
 1489                 fpuresume(susppcbs[cpu]->sp_fpususpend);
 1490                 pmap_init_pat();
 1491                 initializecpu();
 1492                 PCPU_SET(switchtime, 0);
 1493                 PCPU_SET(switchticks, ticks);
 1494 
 1495                 /* Indicate that we are resumed */
 1496                 CPU_CLR_ATOMIC(cpu, &suspended_cpus);
 1497         }
 1498 
 1499         /* Wait for resume */
 1500         while (!CPU_ISSET(cpu, &started_cpus))
 1501                 ia32_pause();
 1502 
 1503         if (cpu_ops.cpu_resume)
 1504                 cpu_ops.cpu_resume();
 1505         if (vmm_resume_p)
 1506                 vmm_resume_p();
 1507 
 1508         /* Resume MCA and local APIC */
 1509         mca_resume();
 1510         lapic_setup(0);
 1511 
 1512         CPU_CLR_ATOMIC(cpu, &started_cpus);
 1513         /* Indicate that we are resumed */
 1514         CPU_CLR_ATOMIC(cpu, &suspended_cpus);
 1515 }
 1516 
 1517 /*
 1518  * Handlers for TLB related IPIs
 1519  */
 1520 void
 1521 invltlb_handler(void)
 1522 {
 1523 #ifdef COUNT_XINVLTLB_HITS
 1524         xhits_gbl[PCPU_GET(cpuid)]++;
 1525 #endif /* COUNT_XINVLTLB_HITS */
 1526 #ifdef COUNT_IPIS
 1527         (*ipi_invltlb_counts[PCPU_GET(cpuid)])++;
 1528 #endif /* COUNT_IPIS */
 1529 
 1530         invltlb();
 1531         atomic_add_int(&smp_tlb_wait, 1);
 1532 }
 1533 
 1534 void
 1535 invltlb_pcid_handler(void)
 1536 {
 1537         uint64_t cr3;
 1538         u_int cpuid;
 1539 #ifdef COUNT_XINVLTLB_HITS
 1540         xhits_gbl[PCPU_GET(cpuid)]++;
 1541 #endif /* COUNT_XINVLTLB_HITS */
 1542 #ifdef COUNT_IPIS
 1543         (*ipi_invltlb_counts[PCPU_GET(cpuid)])++;
 1544 #endif /* COUNT_IPIS */
 1545 
 1546         if (smp_tlb_invpcid.pcid != (uint64_t)-1 &&
 1547             smp_tlb_invpcid.pcid != 0) {
 1548                 if (invpcid_works) {
 1549                         invpcid(&smp_tlb_invpcid, INVPCID_CTX);
 1550                 } else {
 1551                         /* Otherwise reload %cr3 twice. */
 1552                         cr3 = rcr3();
 1553                         if (cr3 != pcid_cr3) {
 1554                                 load_cr3(pcid_cr3);
 1555                                 cr3 |= CR3_PCID_SAVE;
 1556                         }
 1557                         load_cr3(cr3);
 1558                 }
 1559         } else {
 1560                 invltlb_globpcid();
 1561         }
 1562         if (smp_tlb_pmap != NULL) {
 1563                 cpuid = PCPU_GET(cpuid);
 1564                 if (!CPU_ISSET(cpuid, &smp_tlb_pmap->pm_active))
 1565                         CPU_CLR_ATOMIC(cpuid, &smp_tlb_pmap->pm_save);
 1566         }
 1567 
 1568         atomic_add_int(&smp_tlb_wait, 1);
 1569 }
 1570 
 1571 void
 1572 invlpg_handler(void)
 1573 {
 1574 #ifdef COUNT_XINVLTLB_HITS
 1575         xhits_pg[PCPU_GET(cpuid)]++;
 1576 #endif /* COUNT_XINVLTLB_HITS */
 1577 #ifdef COUNT_IPIS
 1578         (*ipi_invlpg_counts[PCPU_GET(cpuid)])++;
 1579 #endif /* COUNT_IPIS */
 1580 
 1581         invlpg(smp_tlb_invpcid.addr);
 1582         atomic_add_int(&smp_tlb_wait, 1);
 1583 }
 1584 
 1585 void
 1586 invlpg_pcid_handler(void)
 1587 {
 1588         uint64_t cr3;
 1589 #ifdef COUNT_XINVLTLB_HITS
 1590         xhits_pg[PCPU_GET(cpuid)]++;
 1591 #endif /* COUNT_XINVLTLB_HITS */
 1592 #ifdef COUNT_IPIS
 1593         (*ipi_invlpg_counts[PCPU_GET(cpuid)])++;
 1594 #endif /* COUNT_IPIS */
 1595 
 1596         if (smp_tlb_invpcid.pcid == (uint64_t)-1) {
 1597                 invltlb_globpcid();
 1598         } else if (smp_tlb_invpcid.pcid == 0) {
 1599                 invlpg(smp_tlb_invpcid.addr);
 1600         } else if (invpcid_works) {
 1601                 invpcid(&smp_tlb_invpcid, INVPCID_ADDR);
 1602         } else {
 1603                 /*
 1604                  * PCID supported, but INVPCID is not.
 1605                  * Temporarily switch to the target address
 1606                  * space and do INVLPG.
 1607                  */
 1608                 cr3 = rcr3();
 1609                 if (cr3 != pcid_cr3)
 1610                         load_cr3(pcid_cr3 | CR3_PCID_SAVE);
 1611                 invlpg(smp_tlb_invpcid.addr);
 1612                 load_cr3(cr3 | CR3_PCID_SAVE);
 1613         }
 1614 
 1615         atomic_add_int(&smp_tlb_wait, 1);
 1616 }
 1617 
 1618 static inline void
 1619 invlpg_range(vm_offset_t start, vm_offset_t end)
 1620 {
 1621 
 1622         do {
 1623                 invlpg(start);
 1624                 start += PAGE_SIZE;
 1625         } while (start < end);
 1626 }
 1627 
 1628 void
 1629 invlrng_handler(void)
 1630 {
 1631         struct invpcid_descr d;
 1632         vm_offset_t addr;
 1633         uint64_t cr3;
 1634         u_int cpuid;
 1635 #ifdef COUNT_XINVLTLB_HITS
 1636         xhits_rng[PCPU_GET(cpuid)]++;
 1637 #endif /* COUNT_XINVLTLB_HITS */
 1638 #ifdef COUNT_IPIS
 1639         (*ipi_invlrng_counts[PCPU_GET(cpuid)])++;
 1640 #endif /* COUNT_IPIS */
 1641 
 1642         addr = smp_tlb_invpcid.addr;
 1643         if (pmap_pcid_enabled) {
 1644                 if (smp_tlb_invpcid.pcid == 0) {
 1645                         /*
 1646                          * kernel pmap - use invlpg to invalidate
 1647                          * global mapping.
 1648                          */
 1649                         invlpg_range(addr, smp_tlb_addr2);
 1650                 } else if (smp_tlb_invpcid.pcid == (uint64_t)-1) {
 1651                         invltlb_globpcid();
 1652                         if (smp_tlb_pmap != NULL) {
 1653                                 cpuid = PCPU_GET(cpuid);
 1654                                 if (!CPU_ISSET(cpuid, &smp_tlb_pmap->pm_active))
 1655                                         CPU_CLR_ATOMIC(cpuid,
 1656                                             &smp_tlb_pmap->pm_save);
 1657                         }
 1658                 } else if (invpcid_works) {
 1659                         d = smp_tlb_invpcid;
 1660                         do {
 1661                                 invpcid(&d, INVPCID_ADDR);
 1662                                 d.addr += PAGE_SIZE;
 1663                         } while (d.addr <= smp_tlb_addr2);
 1664                 } else {
 1665                         cr3 = rcr3();
 1666                         if (cr3 != pcid_cr3)
 1667                                 load_cr3(pcid_cr3 | CR3_PCID_SAVE);
 1668                         invlpg_range(addr, smp_tlb_addr2);
 1669                         load_cr3(cr3 | CR3_PCID_SAVE);
 1670                 }
 1671         } else {
 1672                 invlpg_range(addr, smp_tlb_addr2);
 1673         }
 1674 
 1675         atomic_add_int(&smp_tlb_wait, 1);
 1676 }
 1677 
 1678 void
 1679 invlcache_handler(void)
 1680 {
 1681 #ifdef COUNT_IPIS
 1682         (*ipi_invlcache_counts[PCPU_GET(cpuid)])++;
 1683 #endif /* COUNT_IPIS */
 1684 
 1685         wbinvd();
 1686         atomic_add_int(&smp_tlb_wait, 1);
 1687 }
 1688 
 1689 /*
 1690  * This is called once the rest of the system is up and running and we're
 1691  * ready to let the AP's out of the pen.
 1692  */
 1693 static void
 1694 release_aps(void *dummy __unused)
 1695 {
 1696 
 1697         if (mp_ncpus == 1) 
 1698                 return;
 1699         atomic_store_rel_int(&aps_ready, 1);
 1700         while (smp_started == 0)
 1701                 ia32_pause();
 1702 }
 1703 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, release_aps, NULL);
 1704 
 1705 #ifdef COUNT_IPIS
 1706 /*
 1707  * Setup interrupt counters for IPI handlers.
 1708  */
 1709 static void
 1710 mp_ipi_intrcnt(void *dummy)
 1711 {
 1712         char buf[64];
 1713         int i;
 1714 
 1715         CPU_FOREACH(i) {
 1716                 snprintf(buf, sizeof(buf), "cpu%d:invltlb", i);
 1717                 intrcnt_add(buf, &ipi_invltlb_counts[i]);
 1718                 snprintf(buf, sizeof(buf), "cpu%d:invlrng", i);
 1719                 intrcnt_add(buf, &ipi_invlrng_counts[i]);
 1720                 snprintf(buf, sizeof(buf), "cpu%d:invlpg", i);
 1721                 intrcnt_add(buf, &ipi_invlpg_counts[i]);
 1722                 snprintf(buf, sizeof(buf), "cpu%d:invlcache", i);
 1723                 intrcnt_add(buf, &ipi_invlcache_counts[i]);
 1724                 snprintf(buf, sizeof(buf), "cpu%d:preempt", i);
 1725                 intrcnt_add(buf, &ipi_preempt_counts[i]);
 1726                 snprintf(buf, sizeof(buf), "cpu%d:ast", i);
 1727                 intrcnt_add(buf, &ipi_ast_counts[i]);
 1728                 snprintf(buf, sizeof(buf), "cpu%d:rendezvous", i);
 1729                 intrcnt_add(buf, &ipi_rendezvous_counts[i]);
 1730                 snprintf(buf, sizeof(buf), "cpu%d:hardclock", i);
 1731                 intrcnt_add(buf, &ipi_hardclock_counts[i]);
 1732         }
 1733 }
 1734 SYSINIT(mp_ipi_intrcnt, SI_SUB_INTR, SI_ORDER_MIDDLE, mp_ipi_intrcnt, NULL);
 1735 #endif
 1736 

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