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 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * This rather uninspiring device enables userland to discover if 31 * the current kernel is actually a dom0 or other domain e.g. domU. 32 */ 33 34 #include <sys/types.h> 35 #include <sys/file.h> 36 #include <sys/errno.h> 37 #include <sys/open.h> 38 #include <sys/cred.h> 39 #include <sys/conf.h> 40 #include <sys/stat.h> 41 #include <sys/modctl.h> 42 #include <sys/ddi.h> 43 #include <sys/sunddi.h> 44 #include <sys/hypervisor.h> 45 #include <sys/sysmacros.h> 46 47 #include <sys/domcaps_impl.h> 48 49 static dev_info_t *domcaps_devi; 50 51 /*ARGSUSED*/ 52 static int 53 domcaps_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result) 54 { 55 if (getminor((dev_t)arg) != DOMCAPS_MINOR) 56 return (DDI_FAILURE); 57 58 switch (cmd) { 59 case DDI_INFO_DEVT2DEVINFO: 60 *result = domcaps_devi; 61 break; 62 case DDI_INFO_DEVT2INSTANCE: 63 *result = 0; 64 break; 65 default: 66 return (DDI_FAILURE); 67 } 68 69 return (DDI_SUCCESS); 70 } 71 72 static int 73 domcaps_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 74 { 75 if (cmd != DDI_ATTACH) 76 return (DDI_FAILURE); 77 78 if (ddi_create_minor_node(devi, ddi_get_name(devi), S_IFCHR, 79 ddi_get_instance(devi), DDI_PSEUDO, 0) != DDI_SUCCESS) 80 return (DDI_FAILURE); 81 82 domcaps_devi = devi; 83 ddi_report_dev(devi); 84 return (DDI_SUCCESS); 85 } 86 87 static int 88 domcaps_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 89 { 90 if (cmd != DDI_DETACH) 91 return (DDI_FAILURE); 92 ddi_remove_minor_node(devi, NULL); 93 domcaps_devi = NULL; 94 return (DDI_SUCCESS); 95 } 96 97 /*ARGSUSED1*/ 98 static int 99 domcaps_open(dev_t *dev, int flag, int otyp, cred_t *cr) 100 { 101 return (getminor(*dev) == DOMCAPS_MINOR ? 0 : ENXIO); 102 } 103 104 /*ARGSUSED*/ 105 static int 106 domcaps_read(dev_t dev, uio_t *uio, cred_t *cr) 107 { 108 if (DOMAIN_IS_INITDOMAIN(xen_info)) { 109 static char data[] = "control_d\n"; 110 size_t nbytes; 111 112 if (uio->uio_loffset > sizeof (data)) 113 return (0); 114 nbytes = MIN(uio->uio_resid, sizeof (data) - uio->uio_loffset); 115 116 return (uiomove(data + uio->uio_loffset, nbytes, 117 UIO_READ, uio)); 118 } 119 120 return (0); 121 } 122 123 static struct cb_ops domcaps_cb_ops = { 124 domcaps_open, 125 nulldev, /* close */ 126 nodev, /* strategy */ 127 nodev, /* print */ 128 nodev, /* dump */ 129 domcaps_read, 130 nodev, /* write */ 131 nodev, /* ioctl */ 132 nodev, /* devmap */ 133 nodev, /* mmap */ 134 nodev, /* segmap */ 135 nochpoll, /* poll */ 136 ddi_prop_op, 137 NULL, 138 D_64BIT | D_MP, 139 CB_REV, 140 NULL, 141 NULL 142 }; 143 144 static struct dev_ops domcaps_dv_ops = { 145 DEVO_REV, 146 0, 147 domcaps_getinfo, 148 nulldev, /* identify */ 149 nulldev, /* probe */ 150 domcaps_attach, 151 domcaps_detach, 152 nodev, /* reset */ 153 &domcaps_cb_ops, 154 NULL, /* struct bus_ops */ 155 NULL /* power */ 156 }; 157 158 static struct modldrv modldrv = { 159 &mod_driverops, 160 "hypervisor capabilities driver %I%", 161 &domcaps_dv_ops 162 }; 163 164 static struct modlinkage modl = { 165 MODREV_1, 166 { 167 (void *)&modldrv, 168 NULL /* null termination */ 169 } 170 }; 171 172 int 173 _init(void) 174 { 175 return (mod_install(&modl)); 176 } 177 178 int 179 _fini(void) 180 { 181 return (mod_remove(&modl)); 182 } 183 184 int 185 _info(struct modinfo *modinfo) 186 { 187 return (mod_info(&modl, modinfo)); 188 } 189