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 * $FreeBSD$ 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 */ 44LEAF(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 51 521: 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 642: 65 PTR_LA t1, _C_LABEL(mpentry) 66 jr t1 67 nop 68END(mpwait) 69