The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/mips/cavium/octeon_mp.c

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    1 /*-
    2  * Copyright (c) 2004-2010 Juli Mallett <jmallett@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   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  * $FreeBSD: releng/8.4/sys/mips/cavium/octeon_mp.c 215938 2010-11-27 12:26:40Z jchandra $
   27  */
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/8.4/sys/mips/cavium/octeon_mp.c 215938 2010-11-27 12:26:40Z jchandra $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/conf.h>
   33 #include <sys/kernel.h>
   34 #include <sys/smp.h>
   35 #include <sys/systm.h>
   36 
   37 #include <machine/hwfunc.h>
   38 #include <machine/md_var.h>
   39 #include <machine/smp.h>
   40 
   41 #include <mips/cavium/octeon_pcmap_regs.h>
   42 
   43 #include <contrib/octeon-sdk/cvmx.h>
   44 #include <contrib/octeon-sdk/cvmx-interrupt.h>
   45 
   46 /* XXX */
   47 extern cvmx_bootinfo_t *octeon_bootinfo;
   48 
   49 unsigned octeon_ap_boot = ~0;
   50 
   51 void
   52 platform_ipi_send(int cpuid)
   53 {
   54         cvmx_write_csr(CVMX_CIU_MBOX_SETX(cpuid), 1);
   55         mips_wbflush();
   56 }
   57 
   58 void
   59 platform_ipi_clear(void)
   60 {
   61         uint64_t action;
   62 
   63         action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(PCPU_GET(cpuid)));
   64         KASSERT(action == 1, ("unexpected IPIs: %#jx", (uintmax_t)action));
   65         cvmx_write_csr(CVMX_CIU_MBOX_CLRX(PCPU_GET(cpuid)), action);
   66 }
   67 
   68 int
   69 platform_ipi_intrnum(void)
   70 {
   71         return (1);
   72 }
   73 
   74 void
   75 platform_init_ap(int cpuid)
   76 {
   77         unsigned ipi_int_mask, clock_int_mask;
   78 
   79         /*
   80          * Set the exception base.
   81          */
   82         mips_wr_ebase(0x80000000 | cpuid);
   83 
   84         /*
   85          * Clear any pending IPIs.
   86          */
   87         cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cpuid), 0xffffffff);
   88 
   89         /*
   90          * Set up interrupts.
   91          */
   92         octeon_ciu_reset();
   93 
   94         /*
   95          * Unmask the clock and ipi interrupts.
   96          */
   97         clock_int_mask = hard_int_mask(5);
   98         ipi_int_mask = hard_int_mask(platform_ipi_intrnum());
   99         set_intr_mask(ipi_int_mask | clock_int_mask);
  100 
  101         mips_wbflush();
  102 }
  103 
  104 int
  105 platform_num_processors(void)
  106 {
  107         return (bitcount32(octeon_bootinfo->core_mask));
  108 }
  109 
  110 struct cpu_group *
  111 platform_smp_topo(void)
  112 {
  113         return (smp_topo_none());
  114 }
  115 
  116 int
  117 platform_start_ap(int cpuid)
  118 {
  119         if (atomic_cmpset_32(&octeon_ap_boot, ~0, cpuid) == 0)
  120                 return (-1);
  121         for (;;) {
  122                 DELAY(1000);
  123                 if (atomic_cmpset_32(&octeon_ap_boot, 0, ~0) != 0)
  124                         return (0);
  125                 printf("Waiting for cpu%d to start\n", cpuid);
  126         }
  127 }

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