FreeBSD/Linux Kernel Cross Reference
sys/mips/rmi/mpwait.S
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: releng/11.1/sys/mips/rmi/mpwait.S 208250 2010-05-18 04:08:58Z rrs $
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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