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