1/*	$NetBSD: ssc.c,v 1.4 2020/01/14 16:23:07 scole Exp $	*/
2
3/*-
4 * Copyright (c) 2001 Doug Rabson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30/* __FBSDID("$FreeBSD: src/sys/boot/ia64/libski/ssc.c,v 1.4 2003/09/08 09:11:32 obrien Exp $"); */
31
32#include <lib/libsa/stand.h>
33#include <lib/libsa/loadfile.h>
34#include "bootstrap.h"
35#include "libski.h"
36
37/*
38 * Ugh... Work around a bug in the Linux version of ski for SSC_GET_RTC. The
39 * PSR.dt register is not preserved properly and causes further memory
40 * references to be done without translation. All we need to do is preserve
41 * PSR.dt across the SSC call. We do this by saving and restoring psr.l
42 * completely.
43 */
44
45__attribute__((__noinline__))
46u_int64_t
47ssc(u_int64_t in0, u_int64_t in1, u_int64_t in2, u_int64_t in3, int which)
48{
49	register u_int64_t psr;
50	register u_int64_t ret0 __asm("r8");
51
52	__asm __volatile("mov %0=psr;;" : "=r"(psr));
53	__asm __volatile("mov r15=%1\n\t"
54			 "break 0x80000;;"
55			 : "=r"(ret0)
56			 : "r"(which), "r"(in0), "r"(in1), "r"(in2), "r"(in3));
57	__asm __volatile("mov psr.l=%0;; srlz.d" :: "r"(psr));
58	return ret0;
59}
60