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/rmi/mpwait.S

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    1 /*-
    2  * Copyright (c) 2010 RMI Technologies Ltd.
    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: stable/8/sys/mips/rmi/mpwait.S 215938 2010-11-27 12:26:40Z jchandra $
   27  */
   28 
   29 #include <machine/asm.h>
   30 #include <machine/cpu.h>
   31 #include <machine/cpuregs.h>
   32 
   33 #include "assym.s"
   34 
   35         .text
   36         .set    noat
   37         .set    noreorder
   38 
   39 /*
   40  * On XLR the slave processors and threads will be executing boot
   41  * loader code on startup. We need to make them run our code before
   42  * blowing away boot loader memory.
   43  */
   44 LEAF(mpwait)
   45         PTR_LA  gp, _C_LABEL(_gp)
   46         PTR_LA  t1, _C_LABEL(xlr_ap_release)
   47         mfc0    t2, $15, 1
   48         andi    t2, 0x1f
   49         sll     t2, t2, 2
   50         add     t1, t2
   51 
   52 1:      lw      t0, 0(t1)
   53         bnez    t0, 2f
   54         nop     /* We should not busy wait in core0 threads */
   55         nop     /* on bootup, this will slow the cpu0 thread */
   56         nop     /* down - TODO - wait with IPI based wakeup */
   57         nop
   58         nop
   59         nop
   60         nop
   61         nop
   62         j       1b
   63         nop
   64 2:
   65         PTR_LA  t1, _C_LABEL(mpentry)
   66         jr      t1
   67         nop
   68 END(mpwait)

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