FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/mp_machdep.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1996, by Steve Passe
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. The name of the developer may NOT be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/i386/i386/mp_machdep.c 338143 2018-08-21 16:43:46Z alc $");
    
    #include "opt_apic.h"
    #include "opt_cpu.h"
    #include "opt_kstack_pages.h"
    #include "opt_pmap.h"
    #include "opt_sched.h"
    #include "opt_smp.h"
    
    #if !defined(lint)
    #if !defined(SMP)
    #error How did you get here?
    #endif
    
    #ifndef DEV_APIC
    #error The apic device is required for SMP, add "device apic" to your config file.
    #endif
    #endif /* not lint */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/cons.h>   /* cngetc() */
    #include <sys/cpuset.h>
    #ifdef GPROF 
    #include <sys/gmon.h>
    #endif
    #include <sys/kernel.h>
    #include <sys/ktr.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/memrange.h>
    #include <sys/mutex.h>
    #include <sys/pcpu.h>
    #include <sys/proc.h>
    #include <sys/sched.h>
    #include <sys/smp.h>
    #include <sys/sysctl.h>
    
    #include <vm/vm.h>
    #include <vm/vm_param.h>
    #include <vm/pmap.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_extern.h>
    
    #include <x86/apicreg.h>
    #include <machine/clock.h>
    #include <machine/cpu.h>
    #include <machine/cputypes.h>
    #include <x86/mca.h>
    #include <machine/md_var.h>
    #include <machine/pcb.h>
    #include <machine/psl.h>
    #include <machine/smp.h>
    #include <machine/specialreg.h>
    #include <x86/ucode.h>
    
    #define WARMBOOT_TARGET         0
    #define WARMBOOT_OFF            (PMAP_MAP_LOW + 0x0467)
    #define WARMBOOT_SEG            (PMAP_MAP_LOW + 0x0469)
    
    #define CMOS_REG                (0x70)
    #define CMOS_DATA               (0x71)
    #define BIOS_RESET              (0x0f)
    #define BIOS_WARM               (0x0a)
    
    /*
     * this code MUST be enabled here and in mpboot.s.
     * it follows the very early stages of AP boot by placing values in CMOS ram.
     * it NORMALLY will never be needed and thus the primitive method for enabling.
     *
   #define CHECK_POINTS
    */
   
   #if defined(CHECK_POINTS)
   #define CHECK_READ(A)    (outb(CMOS_REG, (A)), inb(CMOS_DATA))
   #define CHECK_WRITE(A,D) (outb(CMOS_REG, (A)), outb(CMOS_DATA, (D)))
   
   #define CHECK_INIT(D);                          \
           CHECK_WRITE(0x34, (D));                 \
           CHECK_WRITE(0x35, (D));                 \
           CHECK_WRITE(0x36, (D));                 \
           CHECK_WRITE(0x37, (D));                 \
           CHECK_WRITE(0x38, (D));                 \
           CHECK_WRITE(0x39, (D));
   
   #define CHECK_PRINT(S);                         \
           printf("%s: %d, %d, %d, %d, %d, %d\n",  \
              (S),                                 \
              CHECK_READ(0x34),                    \
              CHECK_READ(0x35),                    \
              CHECK_READ(0x36),                    \
              CHECK_READ(0x37),                    \
              CHECK_READ(0x38),                    \
              CHECK_READ(0x39));
   
   #else                           /* CHECK_POINTS */
   
   #define CHECK_INIT(D)
   #define CHECK_PRINT(S)
   #define CHECK_WRITE(A, D)
   
   #endif                          /* CHECK_POINTS */
   
   extern  struct pcpu __pcpu[];
   
   /*
    * Local data and functions.
    */
   
   static void     install_ap_tramp(void);
   static int      start_all_aps(void);
   static int      start_ap(int apic_id);
   
   static char *ap_copyout_buf;
   static char *ap_tramp_stack_base;
   /*
    * Initialize the IPI handlers and start up the AP's.
    */
   void
   cpu_mp_start(void)
   {
           int i;
   
           /* Initialize the logical ID to APIC ID table. */
           for (i = 0; i < MAXCPU; i++) {
                   cpu_apic_ids[i] = -1;
                   cpu_ipi_pending[i] = 0;
           }
   
           /* Install an inter-CPU IPI for TLB invalidation */
           setidt(IPI_INVLTLB, IDTVEC(invltlb),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
           setidt(IPI_INVLPG, IDTVEC(invlpg),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
           setidt(IPI_INVLRNG, IDTVEC(invlrng),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Install an inter-CPU IPI for cache invalidation. */
           setidt(IPI_INVLCACHE, IDTVEC(invlcache),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Install an inter-CPU IPI for all-CPU rendezvous */
           setidt(IPI_RENDEZVOUS, IDTVEC(rendezvous),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Install generic inter-CPU IPI handler */
           setidt(IPI_BITMAP_VECTOR, IDTVEC(ipi_intr_bitmap_handler),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Install an inter-CPU IPI for CPU stop/restart */
           setidt(IPI_STOP, IDTVEC(cpustop),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Install an inter-CPU IPI for CPU suspend/resume */
           setidt(IPI_SUSPEND, IDTVEC(cpususpend),
                  SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL));
   
           /* Set boot_cpu_id if needed. */
           if (boot_cpu_id == -1) {
                   boot_cpu_id = PCPU_GET(apic_id);
                   cpu_info[boot_cpu_id].cpu_bsp = 1;
           } else
                   KASSERT(boot_cpu_id == PCPU_GET(apic_id),
                       ("BSP's APIC ID doesn't match boot_cpu_id"));
   
           /* Probe logical/physical core configuration. */
           topo_probe();
   
           assign_cpu_ids();
   
           /* Start each Application Processor */
           start_all_aps();
   
           set_interrupt_apic_ids();
   }
   
   /*
    * AP CPU's call this to initialize themselves.
    */
   void
   init_secondary(void)
   {
           struct pcpu *pc;
           struct i386tss *common_tssp;
           struct region_descriptor r_gdt, r_idt;
           int gsel_tss, myid, x;
           u_int cr0;
   
           /* bootAP is set in start_ap() to our ID. */
           myid = bootAP;
   
           /* Update microcode before doing anything else. */
           ucode_load_ap(myid);
   
           /* Get per-cpu data */
           pc = &__pcpu[myid];
   
           /* prime data page for it to use */
           pcpu_init(pc, myid, sizeof(struct pcpu));
           dpcpu_init(dpcpu, myid);
           pc->pc_apic_id = cpu_apic_ids[myid];
           pc->pc_prvspace = pc;
           pc->pc_curthread = 0;
           pc->pc_common_tssp = common_tssp = &(__pcpu[0].pc_common_tssp)[myid];
   
           fix_cpuid();
   
           gdt_segs[GPRIV_SEL].ssd_base = (int)pc;
           gdt_segs[GPROC0_SEL].ssd_base = (int)common_tssp;
           gdt_segs[GLDT_SEL].ssd_base = (int)ldt;
   
           for (x = 0; x < NGDT; x++) {
                   ssdtosd(&gdt_segs[x], &gdt[myid * NGDT + x].sd);
           }
   
           r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
           r_gdt.rd_base = (int) &gdt[myid * NGDT];
           lgdt(&r_gdt);                   /* does magic intra-segment return */
   
           r_idt.rd_limit = sizeof(struct gate_descriptor) * NIDT - 1;
           r_idt.rd_base = (int)idt;
           lidt(&r_idt);
   
           lldt(_default_ldt);
           PCPU_SET(currentldt, _default_ldt);
   
           PCPU_SET(trampstk, (uintptr_t)ap_tramp_stack_base + TRAMP_STACK_SZ -
               VM86_STACK_SPACE);
   
           gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
           gdt[myid * NGDT + GPROC0_SEL].sd.sd_type = SDT_SYS386TSS;
           common_tssp->tss_esp0 = PCPU_GET(trampstk);
           common_tssp->tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
           common_tssp->tss_ioopt = sizeof(struct i386tss) << 16;
           PCPU_SET(tss_gdt, &gdt[myid * NGDT + GPROC0_SEL].sd);
           PCPU_SET(common_tssd, *PCPU_GET(tss_gdt));
           ltr(gsel_tss);
   
           PCPU_SET(fsgs_gdt, &gdt[myid * NGDT + GUFS_SEL].sd);
           PCPU_SET(copyout_buf, ap_copyout_buf);
   
           /*
            * Set to a known state:
            * Set by mpboot.s: CR0_PG, CR0_PE
            * Set by cpu_setregs: CR0_NE, CR0_MP, CR0_TS, CR0_WP, CR0_AM
            */
           cr0 = rcr0();
           cr0 &= ~(CR0_CD | CR0_NW | CR0_EM);
           load_cr0(cr0);
           CHECK_WRITE(0x38, 5);
           
           /* signal our startup to the BSP. */
           mp_naps++;
           CHECK_WRITE(0x39, 6);
   
           /* Spin until the BSP releases the AP's. */
           while (atomic_load_acq_int(&aps_ready) == 0)
                   ia32_pause();
   
           /* BSP may have changed PTD while we were waiting */
           invltlb();
   
   #if defined(I586_CPU) && !defined(NO_F00F_HACK)
           lidt(&r_idt);
   #endif
   
           init_secondary_tail();
   }
   
   /*
    * start each AP in our list
    */
   #define TMPMAP_START 1
   static int
   start_all_aps(void)
   {
           u_char mpbiosreason;
           u_int32_t mpbioswarmvec;
           int apic_id, cpu;
   
           mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
   
           /* Remap lowest 1MB */
           IdlePTD[0] = IdlePTD[1];
           load_cr3(rcr3());               /* invalidate TLB */
   
           /* install the AP 1st level boot code */
           install_ap_tramp();
   
           /* save the current value of the warm-start vector */
           mpbioswarmvec = *((u_int32_t *) WARMBOOT_OFF);
           outb(CMOS_REG, BIOS_RESET);
           mpbiosreason = inb(CMOS_DATA);
   
           /* take advantage of the P==V mapping for PTD[0] for AP boot */
   
           /* start each AP */
           for (cpu = 1; cpu < mp_ncpus; cpu++) {
                   apic_id = cpu_apic_ids[cpu];
   
                   /* allocate and set up a boot stack data page */
                   bootstacks[cpu] = (char *)kmem_malloc(kstack_pages * PAGE_SIZE,
                       M_WAITOK | M_ZERO);
                   dpcpu = (void *)kmem_malloc(DPCPU_SIZE, M_WAITOK | M_ZERO);
                   /* setup a vector to our boot code */
                   *((volatile u_short *) WARMBOOT_OFF) = WARMBOOT_TARGET;
                   *((volatile u_short *) WARMBOOT_SEG) = (boot_address >> 4);
                   outb(CMOS_REG, BIOS_RESET);
                   outb(CMOS_DATA, BIOS_WARM);     /* 'warm-start' */
   
                   bootSTK = (char *)bootstacks[cpu] + kstack_pages *
                       PAGE_SIZE - 4;
                   bootAP = cpu;
   
                   ap_tramp_stack_base = pmap_trm_alloc(TRAMP_STACK_SZ, M_NOWAIT);
                   ap_copyout_buf = pmap_trm_alloc(TRAMP_COPYOUT_SZ, M_NOWAIT);
   
                   /* attempt to start the Application Processor */
                   CHECK_INIT(99); /* setup checkpoints */
                   if (!start_ap(apic_id)) {
                           printf("AP #%d (PHY# %d) failed!\n", cpu, apic_id);
                           CHECK_PRINT("trace");   /* show checkpoints */
                           /* better panic as the AP may be running loose */
                           printf("panic y/n? [y] ");
                           if (cngetc() != 'n')
                                   panic("bye-bye");
                   }
                   CHECK_PRINT("trace");           /* show checkpoints */
   
                   CPU_SET(cpu, &all_cpus);        /* record AP in CPU map */
           }
   
           /* Unmap lowest 1MB again */
           IdlePTD[0] = 0;
           load_cr3(rcr3());
   
           /* restore the warmstart vector */
           *(u_int32_t *) WARMBOOT_OFF = mpbioswarmvec;
   
           outb(CMOS_REG, BIOS_RESET);
           outb(CMOS_DATA, mpbiosreason);
   
           /* number of APs actually started */
           return mp_naps;
   }
   
   /*
    * load the 1st level AP boot code into base memory.
    */
   
   /* targets for relocation */
   extern void bigJump(void);
   extern void bootCodeSeg(void);
   extern void bootDataSeg(void);
   extern void MPentry(void);
   extern u_int MP_GDT;
   extern u_int mp_gdtbase;
   
   static void
   install_ap_tramp(void)
   {
           int     x;
           int     size = *(int *) ((u_long) & bootMP_size);
           vm_offset_t va = boot_address;
           u_char *src = (u_char *) ((u_long) bootMP);
           u_char *dst = (u_char *) va;
           u_int   boot_base = (u_int) bootMP;
           u_int8_t *dst8;
           u_int16_t *dst16;
           u_int32_t *dst32;
   
           KASSERT (size <= PAGE_SIZE,
               ("'size' do not fit into PAGE_SIZE, as expected."));
           pmap_kenter(va, boot_address);
           pmap_invalidate_page (kernel_pmap, va);
           for (x = 0; x < size; ++x)
                   *dst++ = *src++;
   
           /*
            * modify addresses in code we just moved to basemem. unfortunately we
            * need fairly detailed info about mpboot.s for this to work.  changes
            * to mpboot.s might require changes here.
            */
   
           /* boot code is located in KERNEL space */
           dst = (u_char *) va;
   
           /* modify the lgdt arg */
           dst32 = (u_int32_t *) (dst + ((u_int) & mp_gdtbase - boot_base));
           *dst32 = boot_address + ((u_int) & MP_GDT - boot_base);
   
           /* modify the ljmp target for MPentry() */
           dst32 = (u_int32_t *) (dst + ((u_int) bigJump - boot_base) + 1);
           *dst32 = (u_int)MPentry;
   
           /* modify the target for boot code segment */
           dst16 = (u_int16_t *) (dst + ((u_int) bootCodeSeg - boot_base));
           dst8 = (u_int8_t *) (dst16 + 1);
           *dst16 = (u_int) boot_address & 0xffff;
           *dst8 = ((u_int) boot_address >> 16) & 0xff;
   
           /* modify the target for boot data segment */
           dst16 = (u_int16_t *) (dst + ((u_int) bootDataSeg - boot_base));
           dst8 = (u_int8_t *) (dst16 + 1);
           *dst16 = (u_int) boot_address & 0xffff;
           *dst8 = ((u_int) boot_address >> 16) & 0xff;
   }
   
   /*
    * This function starts the AP (application processor) identified
    * by the APIC ID 'physicalCpu'.  It does quite a "song and dance"
    * to accomplish this.  This is necessary because of the nuances
    * of the different hardware we might encounter.  It isn't pretty,
    * but it seems to work.
    */
   static int
   start_ap(int apic_id)
   {
           int vector, ms;
           int cpus;
   
           /* calculate the vector */
           vector = (boot_address >> 12) & 0xff;
   
           /* used as a watchpoint to signal AP startup */
           cpus = mp_naps;
   
           ipi_startup(apic_id, vector);
   
           /* Wait up to 5 seconds for it to start. */
           for (ms = 0; ms < 5000; ms++) {
                   if (mp_naps > cpus)
                           return 1;       /* return SUCCESS */
                   DELAY(1000);
           }
           return 0;               /* return FAILURE */
   }

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