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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * This rather uninspiring device enables userland to discover if 29 * the current kernel is actually a dom0 or other domain e.g. domU. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/file.h> 34 #include <sys/errno.h> 35 #include <sys/open.h> 36 #include <sys/cred.h> 37 #include <sys/conf.h> 38 #include <sys/stat.h> 39 #include <sys/modctl.h> 40 #include <sys/ddi.h> 41 #include <sys/sunddi.h> 42 #include <sys/hypervisor.h> 43 #include <sys/sysmacros.h> 44 45 #include <sys/domcaps_impl.h> 46 47 static dev_info_t *domcaps_devi; 48 49 /*ARGSUSED*/ 50 static int 51 domcaps_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result) 52 { 53 if (getminor((dev_t)arg) != DOMCAPS_MINOR) 54 return (DDI_FAILURE); 55 56 switch (cmd) { 57 case DDI_INFO_DEVT2DEVINFO: 58 *result = domcaps_devi; 59 break; 60 case DDI_INFO_DEVT2INSTANCE: 61 *result = 0; 62 break; 63 default: 64 return (DDI_FAILURE); 65 } 66 67 return (DDI_SUCCESS); 68 } 69 70 static int 71 domcaps_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 72 { 73 if (cmd != DDI_ATTACH) 74 return (DDI_FAILURE); 75 76 if (ddi_create_minor_node(devi, ddi_get_name(devi), S_IFCHR, 77 ddi_get_instance(devi), DDI_PSEUDO, 0) != DDI_SUCCESS) 78 return (DDI_FAILURE); 79 80 domcaps_devi = devi; 81 ddi_report_dev(devi); 82 return (DDI_SUCCESS); 83 } 84 85 static int 86 domcaps_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 87 { 88 if (cmd != DDI_DETACH) 89 return (DDI_FAILURE); 90 ddi_remove_minor_node(devi, NULL); 91 domcaps_devi = NULL; 92 return (DDI_SUCCESS); 93 } 94 95 /*ARGSUSED1*/ 96 static int 97 domcaps_open(dev_t *dev, int flag, int otyp, cred_t *cr) 98 { 99 return (getminor(*dev) == DOMCAPS_MINOR ? 0 : ENXIO); 100 } 101 102 /*ARGSUSED*/ 103 static int 104 domcaps_read(dev_t dev, uio_t *uio, cred_t *cr) 105 { 106 if (DOMAIN_IS_INITDOMAIN(xen_info)) { 107 static char data[] = "control_d\n"; 108 size_t nbytes; 109 110 if (uio->uio_loffset > sizeof (data)) 111 return (0); 112 nbytes = MIN(uio->uio_resid, sizeof (data) - uio->uio_loffset); 113 114 return (uiomove(data + uio->uio_loffset, nbytes, 115 UIO_READ, uio)); 116 } 117 118 return (0); 119 } 120 121 static struct cb_ops domcaps_cb_ops = { 122 domcaps_open, 123 nulldev, /* close */ 124 nodev, /* strategy */ 125 nodev, /* print */ 126 nodev, /* dump */ 127 domcaps_read, 128 nodev, /* write */ 129 nodev, /* ioctl */ 130 nodev, /* devmap */ 131 nodev, /* mmap */ 132 nodev, /* segmap */ 133 nochpoll, /* poll */ 134 ddi_prop_op, 135 NULL, 136 D_64BIT | D_MP, 137 CB_REV, 138 NULL, 139 NULL 140 }; 141 142 static struct dev_ops domcaps_dv_ops = { 143 DEVO_REV, 144 0, 145 domcaps_getinfo, 146 nulldev, /* identify */ 147 nulldev, /* probe */ 148 domcaps_attach, 149 domcaps_detach, 150 nodev, /* reset */ 151 &domcaps_cb_ops, 152 NULL, /* struct bus_ops */ 153 NULL, /* power */ 154 ddi_quiesce_not_needed, /* quiesce */ 155 }; 156 157 static struct modldrv modldrv = { 158 &mod_driverops, 159 "hypervisor capabilities driver", 160 &domcaps_dv_ops 161 }; 162 163 static struct modlinkage modl = { 164 MODREV_1, 165 { 166 (void *)&modldrv, 167 NULL /* null termination */ 168 } 169 }; 170 171 int 172 _init(void) 173 { 174 return (mod_install(&modl)); 175 } 176 177 int 178 _fini(void) 179 { 180 return (mod_remove(&modl)); 181 } 182 183 int 184 _info(struct modinfo *modinfo) 185 { 186 return (mod_info(&modl, modinfo)); 187 } 188