Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
[dragonfly.git] / sys / boot / ia64 / libski / ssc.c
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1/*-
2 * Copyright (c) 2001 Doug Rabson
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: src/sys/boot/ia64/libski/ssc.c,v 1.4 2003/09/08 09:11:32 obrien Exp $
27 * $DragonFly: src/sys/boot/ia64/libski/ssc.c,v 1.1 2003/11/10 06:08:37 dillon Exp $
28 */
29
30#include <stand.h>
31#include "libski.h"
32
33/*
34 * Ugh... Work around a bug in the Linux version of ski for SSC_GET_RTC. The
35 * PSR.dt register is not preserved properly and causes further memory
36 * references to be done without translation. All we need to do is preserve
37 * PSR.dt across the SSC call. We do this by saving and restoring psr.l
38 * completely.
39 */
40u_int64_t
41ssc(u_int64_t in0, u_int64_t in1, u_int64_t in2, u_int64_t in3, int which)
42{
43 register u_int64_t psr;
44 register u_int64_t ret0 __asm("r8");
45
46 __asm __volatile("mov %0=psr;;" : "=r"(psr));
47 __asm __volatile("mov r15=%1\n\t"
48 "break 0x80000;;"
49 : "=r"(ret0)
50 : "r"(which), "r"(in0), "r"(in1), "r"(in2), "r"(in3));
51 __asm __volatile("mov psr.l=%0;; srlz.d" :: "r"(psr));
52 return ret0;
53}