1 /*-
2 * Copyright (C) 2015 Nathan Whitehorn
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 ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include <dev/ofw/openfirm.h>
27
28 #include "opal.h"
29
30 extern uint64_t opal_entrypoint;
31 extern uint64_t opal_data;
32 extern uint64_t opal_msr;
33
34 static int opal_initialized = 0;
35
36 int
opal_check(void)37 opal_check(void)
38 {
39 phandle_t opal;
40 cell_t val[2];
41
42 if (opal_initialized)
43 return (0);
44
45 opal = OF_finddevice("/ibm,opal");
46 if (opal == -1)
47 return (ENOENT);
48
49 if (!OF_hasprop(opal, "opal-base-address") ||
50 !OF_hasprop(opal, "opal-entry-address"))
51 return (ENOENT);
52
53 OF_getencprop(opal, "opal-base-address", val, sizeof(val));
54 opal_data = ((uint64_t)val[0] << 32) | val[1];
55 OF_getencprop(opal, "opal-entry-address", val, sizeof(val));
56 opal_entrypoint = ((uint64_t)val[0] << 32) | val[1];
57
58 opal_msr = mfmsr() & ~(PSL_EE | PSL_IR | PSL_DR | PSL_SE | PSL_LE);
59
60 opal_initialized = 1;
61
62 return (0);
63 }
64