1d24234c2SJerry Gilliam /*
2d24234c2SJerry Gilliam * CDDL HEADER START
3d24234c2SJerry Gilliam *
4d24234c2SJerry Gilliam * The contents of this file are subject to the terms of the
5d24234c2SJerry Gilliam * Common Development and Distribution License (the "License").
6d24234c2SJerry Gilliam * You may not use this file except in compliance with the License.
7d24234c2SJerry Gilliam *
8d24234c2SJerry Gilliam * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9d24234c2SJerry Gilliam * or http://www.opensolaris.org/os/licensing.
10d24234c2SJerry Gilliam * See the License for the specific language governing permissions
11d24234c2SJerry Gilliam * and limitations under the License.
12d24234c2SJerry Gilliam *
13d24234c2SJerry Gilliam * When distributing Covered Code, include this CDDL HEADER in each
14d24234c2SJerry Gilliam * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15d24234c2SJerry Gilliam * If applicable, add the following below this CDDL HEADER, with the
16d24234c2SJerry Gilliam * fields enclosed by brackets "[]" replaced with your own identifying
17d24234c2SJerry Gilliam * information: Portions Copyright [yyyy] [name of copyright owner]
18d24234c2SJerry Gilliam *
19d24234c2SJerry Gilliam * CDDL HEADER END
20d24234c2SJerry Gilliam */
21d24234c2SJerry Gilliam /*
22d24234c2SJerry Gilliam * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23d24234c2SJerry Gilliam * Use is subject to license terms.
24d24234c2SJerry Gilliam */
25*2a1fd0ffSPeter Tribble /*
26*2a1fd0ffSPeter Tribble * Copyright 2019 Peter Tribble.
27*2a1fd0ffSPeter Tribble */
28d24234c2SJerry Gilliam
29d24234c2SJerry Gilliam #include <sys/types.h>
30d24234c2SJerry Gilliam #include <sys/param.h>
31d24234c2SJerry Gilliam #include <sys/fcntl.h>
32d24234c2SJerry Gilliam #include <sys/promif.h>
33d24234c2SJerry Gilliam #include <sys/prom_plat.h>
34d24234c2SJerry Gilliam #include <sys/salib.h>
35d24234c2SJerry Gilliam
36d24234c2SJerry Gilliam extern int is_sun4v;
37d24234c2SJerry Gilliam
38d24234c2SJerry Gilliam /*
39d24234c2SJerry Gilliam * Retain a page or reclaim a previously retained page of physical
40d24234c2SJerry Gilliam * memory for use by the prom upgrade. If successful, leave
41d24234c2SJerry Gilliam * an indication that a page was retained by creating a boolean
42d24234c2SJerry Gilliam * property in the root node.
43d24234c2SJerry Gilliam *
44d24234c2SJerry Gilliam * XXX: SUNW,retain doesn't work as expected on server systems,
45d24234c2SJerry Gilliam * so we don't try to retain any memory on those systems.
46d24234c2SJerry Gilliam *
47d24234c2SJerry Gilliam * XXX: do a '0 to my-self' as a workaround for 4160914
48d24234c2SJerry Gilliam */
49d24234c2SJerry Gilliam
50d24234c2SJerry Gilliam int dont_retain_memory;
51d24234c2SJerry Gilliam
52d24234c2SJerry Gilliam void
retain_nvram_page(void)53d24234c2SJerry Gilliam retain_nvram_page(void)
54d24234c2SJerry Gilliam {
55d24234c2SJerry Gilliam unsigned long long phys = 0;
56d24234c2SJerry Gilliam int len;
57d24234c2SJerry Gilliam char name[32];
58d24234c2SJerry Gilliam static char create_prop[] =
59d24234c2SJerry Gilliam "0 to my-self dev / 0 0 \" boot-retained-page\" property";
60d24234c2SJerry Gilliam static char ue[] = "SUNW,Ultra-Enterprise";
61d24234c2SJerry Gilliam extern int verbosemode;
62d24234c2SJerry Gilliam
63d24234c2SJerry Gilliam if (dont_retain_memory)
64d24234c2SJerry Gilliam return;
65d24234c2SJerry Gilliam
66d24234c2SJerry Gilliam if (!is_sun4v) {
67d24234c2SJerry Gilliam len = prom_getproplen(prom_rootnode(), "name");
68d24234c2SJerry Gilliam if ((len != -1) && (len <= sizeof (name))) {
69d24234c2SJerry Gilliam (void) prom_getprop(prom_rootnode(), "name", name);
70*2a1fd0ffSPeter Tribble if (strcmp(name, ue) == 0)
71d24234c2SJerry Gilliam return;
72d24234c2SJerry Gilliam }
73d24234c2SJerry Gilliam }
74d24234c2SJerry Gilliam
75d24234c2SJerry Gilliam if (prom_retain("OBPnvram", PAGESIZE, PAGESIZE, &phys) != 0) {
76d24234c2SJerry Gilliam printf("prom_retain failed\n");
77d24234c2SJerry Gilliam return;
78d24234c2SJerry Gilliam }
79d24234c2SJerry Gilliam if (verbosemode)
80d24234c2SJerry Gilliam printf("retained OBPnvram page at 0x%llx\n", phys);
81d24234c2SJerry Gilliam
82d24234c2SJerry Gilliam prom_interpret(create_prop, 0, 0, 0, 0, 0);
83d24234c2SJerry Gilliam }
84