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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2019 Peter Tribble.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/fcntl.h>
#include <sys/promif.h>
#include <sys/prom_plat.h>
#include <sys/salib.h>
extern int is_sun4v;
/*
* Retain a page or reclaim a previously retained page of physical
* memory for use by the prom upgrade. If successful, leave
* an indication that a page was retained by creating a boolean
* property in the root node.
*
* XXX: SUNW,retain doesn't work as expected on server systems,
* so we don't try to retain any memory on those systems.
*
* XXX: do a '0 to my-self' as a workaround for 4160914
*/
int dont_retain_memory;
void
retain_nvram_page(void)
{
unsigned long long phys = 0;
int len;
char name[32];
static char create_prop[] =
"0 to my-self dev / 0 0 \" boot-retained-page\" property";
static char ue[] = "SUNW,Ultra-Enterprise";
extern int verbosemode;
if (dont_retain_memory)
return;
if (!is_sun4v) {
len = prom_getproplen(prom_rootnode(), "name");
if ((len != -1) && (len <= sizeof (name))) {
(void) prom_getprop(prom_rootnode(), "name", name);
if (strcmp(name, ue) == 0)
return;
}
}
if (prom_retain("OBPnvram", PAGESIZE, PAGESIZE, &phys) != 0) {
printf("prom_retain failed\n");
return;
}
if (verbosemode)
printf("retained OBPnvram page at 0x%llx\n", phys);
prom_interpret(create_prop, 0, 0, 0, 0, 0);
}
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