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      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__))
     46 u_int64_t
     47 ssc(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