1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * sun4v machine description driver 31*0Sstevel@tonic-gate */ 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #include <sys/types.h> 34*0Sstevel@tonic-gate #include <sys/file.h> 35*0Sstevel@tonic-gate #include <sys/errno.h> 36*0Sstevel@tonic-gate #include <sys/open.h> 37*0Sstevel@tonic-gate #include <sys/cred.h> 38*0Sstevel@tonic-gate #include <sys/uio.h> 39*0Sstevel@tonic-gate #include <sys/stat.h> 40*0Sstevel@tonic-gate #include <sys/ksynch.h> 41*0Sstevel@tonic-gate #include <sys/modctl.h> 42*0Sstevel@tonic-gate #include <sys/conf.h> 43*0Sstevel@tonic-gate #include <sys/devops.h> 44*0Sstevel@tonic-gate #include <sys/debug.h> 45*0Sstevel@tonic-gate #include <sys/cmn_err.h> 46*0Sstevel@tonic-gate #include <sys/ddi.h> 47*0Sstevel@tonic-gate #include <sys/sunddi.h> 48*0Sstevel@tonic-gate 49*0Sstevel@tonic-gate #include <sys/mdesc.h> 50*0Sstevel@tonic-gate #include <sys/mach_descrip.h> 51*0Sstevel@tonic-gate 52*0Sstevel@tonic-gate #define MDESC_NAME "mdesc" 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate /* 55*0Sstevel@tonic-gate * Operational state flags 56*0Sstevel@tonic-gate */ 57*0Sstevel@tonic-gate 58*0Sstevel@tonic-gate #define MDESC_DIDMINOR 0x2 /* Created minors */ 59*0Sstevel@tonic-gate #define MDESC_DIDMUTEX 0x8 /* Created mutex */ 60*0Sstevel@tonic-gate #define MDESC_DIDCV 0x10 /* Created cv */ 61*0Sstevel@tonic-gate #define MDESC_BUSY 0x20 /* Device is busy */ 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate static void *mdesc_state_head; 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate struct mdesc_state { 66*0Sstevel@tonic-gate int instance; 67*0Sstevel@tonic-gate dev_info_t *devi; 68*0Sstevel@tonic-gate kmutex_t lock; 69*0Sstevel@tonic-gate kcondvar_t cv; 70*0Sstevel@tonic-gate size_t mdesc_len; 71*0Sstevel@tonic-gate uint8_t *mdesc; 72*0Sstevel@tonic-gate int flags; 73*0Sstevel@tonic-gate }; 74*0Sstevel@tonic-gate 75*0Sstevel@tonic-gate static int mdesc_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 76*0Sstevel@tonic-gate static int mdesc_attach(dev_info_t *, ddi_attach_cmd_t); 77*0Sstevel@tonic-gate static int mdesc_detach(dev_info_t *, ddi_detach_cmd_t); 78*0Sstevel@tonic-gate static int mdesc_open(dev_t *, int, int, cred_t *); 79*0Sstevel@tonic-gate static int mdesc_close(dev_t, int, int, cred_t *); 80*0Sstevel@tonic-gate static int mdesc_read(dev_t, struct uio *, cred_t *); 81*0Sstevel@tonic-gate static int mdesc_write(dev_t, struct uio *, cred_t *); 82*0Sstevel@tonic-gate static int mdesc_rw(dev_t, struct uio *, enum uio_rw); 83*0Sstevel@tonic-gate static int mdesc_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate static struct cb_ops mdesc_cb_ops = { 86*0Sstevel@tonic-gate mdesc_open, /* cb_open */ 87*0Sstevel@tonic-gate mdesc_close, /* cb_close */ 88*0Sstevel@tonic-gate nodev, /* cb_strategy */ 89*0Sstevel@tonic-gate nodev, /* cb_print */ 90*0Sstevel@tonic-gate nodev, /* cb_dump */ 91*0Sstevel@tonic-gate mdesc_read, /* cb_read */ 92*0Sstevel@tonic-gate nodev, /* cb_write */ 93*0Sstevel@tonic-gate mdesc_ioctl, /* cb_ioctl */ 94*0Sstevel@tonic-gate nodev, /* cb_devmap */ 95*0Sstevel@tonic-gate nodev, /* cb_mmap */ 96*0Sstevel@tonic-gate nodev, /* cb_segmap */ 97*0Sstevel@tonic-gate nochpoll, /* cb_chpoll */ 98*0Sstevel@tonic-gate ddi_prop_op, /* cb_prop_op */ 99*0Sstevel@tonic-gate (struct streamtab *)NULL, /* cb_str */ 100*0Sstevel@tonic-gate D_MP | D_64BIT, /* cb_flag */ 101*0Sstevel@tonic-gate CB_REV, /* cb_rev */ 102*0Sstevel@tonic-gate nodev, /* cb_aread */ 103*0Sstevel@tonic-gate nodev /* cb_awrite */ 104*0Sstevel@tonic-gate }; 105*0Sstevel@tonic-gate 106*0Sstevel@tonic-gate static struct dev_ops mdesc_dev_ops = { 107*0Sstevel@tonic-gate DEVO_REV, /* devo_rev */ 108*0Sstevel@tonic-gate 0, /* devo_refcnt */ 109*0Sstevel@tonic-gate mdesc_getinfo, /* devo_getinfo */ 110*0Sstevel@tonic-gate nulldev, /* devo_identify */ 111*0Sstevel@tonic-gate nulldev, /* devo_probe */ 112*0Sstevel@tonic-gate mdesc_attach, /* devo_attach */ 113*0Sstevel@tonic-gate mdesc_detach, /* devo_detach */ 114*0Sstevel@tonic-gate nodev, /* devo_reset */ 115*0Sstevel@tonic-gate &mdesc_cb_ops, /* devo_cb_ops */ 116*0Sstevel@tonic-gate (struct bus_ops *)NULL, /* devo_bus_ops */ 117*0Sstevel@tonic-gate nulldev /* devo_power */ 118*0Sstevel@tonic-gate }; 119*0Sstevel@tonic-gate 120*0Sstevel@tonic-gate static struct modldrv modldrv = { 121*0Sstevel@tonic-gate &mod_driverops, 122*0Sstevel@tonic-gate "Machine Description Driver 1.0", 123*0Sstevel@tonic-gate &mdesc_dev_ops}; 124*0Sstevel@tonic-gate 125*0Sstevel@tonic-gate static struct modlinkage modlinkage = { 126*0Sstevel@tonic-gate MODREV_1, 127*0Sstevel@tonic-gate (void *)&modldrv, 128*0Sstevel@tonic-gate NULL 129*0Sstevel@tonic-gate }; 130*0Sstevel@tonic-gate 131*0Sstevel@tonic-gate 132*0Sstevel@tonic-gate 133*0Sstevel@tonic-gate 134*0Sstevel@tonic-gate 135*0Sstevel@tonic-gate 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate 138*0Sstevel@tonic-gate int 139*0Sstevel@tonic-gate _init(void) 140*0Sstevel@tonic-gate { 141*0Sstevel@tonic-gate int retval; 142*0Sstevel@tonic-gate 143*0Sstevel@tonic-gate if ((retval = ddi_soft_state_init(&mdesc_state_head, 144*0Sstevel@tonic-gate sizeof (struct mdesc_state), 1)) != 0) 145*0Sstevel@tonic-gate return (retval); 146*0Sstevel@tonic-gate if ((retval = mod_install(&modlinkage)) != 0) { 147*0Sstevel@tonic-gate ddi_soft_state_fini(&mdesc_state_head); 148*0Sstevel@tonic-gate return (retval); 149*0Sstevel@tonic-gate } 150*0Sstevel@tonic-gate 151*0Sstevel@tonic-gate return (retval); 152*0Sstevel@tonic-gate } 153*0Sstevel@tonic-gate 154*0Sstevel@tonic-gate 155*0Sstevel@tonic-gate 156*0Sstevel@tonic-gate 157*0Sstevel@tonic-gate int 158*0Sstevel@tonic-gate _info(struct modinfo *modinfop) 159*0Sstevel@tonic-gate { 160*0Sstevel@tonic-gate return (mod_info(&modlinkage, modinfop)); 161*0Sstevel@tonic-gate } 162*0Sstevel@tonic-gate 163*0Sstevel@tonic-gate 164*0Sstevel@tonic-gate 165*0Sstevel@tonic-gate 166*0Sstevel@tonic-gate int 167*0Sstevel@tonic-gate _fini(void) 168*0Sstevel@tonic-gate { 169*0Sstevel@tonic-gate int retval; 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate if ((retval = mod_remove(&modlinkage)) != 0) 172*0Sstevel@tonic-gate return (retval); 173*0Sstevel@tonic-gate ddi_soft_state_fini(&mdesc_state_head); 174*0Sstevel@tonic-gate 175*0Sstevel@tonic-gate return (retval); 176*0Sstevel@tonic-gate } 177*0Sstevel@tonic-gate 178*0Sstevel@tonic-gate 179*0Sstevel@tonic-gate 180*0Sstevel@tonic-gate 181*0Sstevel@tonic-gate /*ARGSUSED*/ 182*0Sstevel@tonic-gate static int 183*0Sstevel@tonic-gate mdesc_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp) 184*0Sstevel@tonic-gate { 185*0Sstevel@tonic-gate struct mdesc_state *mdsp; 186*0Sstevel@tonic-gate int retval = DDI_FAILURE; 187*0Sstevel@tonic-gate 188*0Sstevel@tonic-gate ASSERT(resultp != NULL); 189*0Sstevel@tonic-gate 190*0Sstevel@tonic-gate switch (cmd) { 191*0Sstevel@tonic-gate case DDI_INFO_DEVT2DEVINFO: 192*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, 193*0Sstevel@tonic-gate getminor((dev_t)arg))) != NULL) { 194*0Sstevel@tonic-gate *resultp = mdsp->devi; 195*0Sstevel@tonic-gate retval = DDI_SUCCESS; 196*0Sstevel@tonic-gate } else 197*0Sstevel@tonic-gate *resultp = NULL; 198*0Sstevel@tonic-gate break; 199*0Sstevel@tonic-gate case DDI_INFO_DEVT2INSTANCE: 200*0Sstevel@tonic-gate *resultp = (void *)getminor((dev_t)arg); 201*0Sstevel@tonic-gate retval = DDI_SUCCESS; 202*0Sstevel@tonic-gate break; 203*0Sstevel@tonic-gate } 204*0Sstevel@tonic-gate 205*0Sstevel@tonic-gate return (retval); 206*0Sstevel@tonic-gate } 207*0Sstevel@tonic-gate 208*0Sstevel@tonic-gate 209*0Sstevel@tonic-gate 210*0Sstevel@tonic-gate 211*0Sstevel@tonic-gate static int 212*0Sstevel@tonic-gate mdesc_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 213*0Sstevel@tonic-gate { 214*0Sstevel@tonic-gate int instance = ddi_get_instance(dip); 215*0Sstevel@tonic-gate struct mdesc_state *mdsp; 216*0Sstevel@tonic-gate 217*0Sstevel@tonic-gate switch (cmd) { 218*0Sstevel@tonic-gate case DDI_ATTACH: 219*0Sstevel@tonic-gate if (ddi_soft_state_zalloc(mdesc_state_head, instance) != 220*0Sstevel@tonic-gate DDI_SUCCESS) { 221*0Sstevel@tonic-gate cmn_err(CE_WARN, "%s@%d: Unable to allocate state", 222*0Sstevel@tonic-gate MDESC_NAME, instance); 223*0Sstevel@tonic-gate return (DDI_FAILURE); 224*0Sstevel@tonic-gate } 225*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == 226*0Sstevel@tonic-gate NULL) { 227*0Sstevel@tonic-gate cmn_err(CE_WARN, "%s@%d: Unable to obtain state", 228*0Sstevel@tonic-gate MDESC_NAME, instance); 229*0Sstevel@tonic-gate ddi_soft_state_free(dip, instance); 230*0Sstevel@tonic-gate return (DDI_FAILURE); 231*0Sstevel@tonic-gate } 232*0Sstevel@tonic-gate if (ddi_create_minor_node(dip, MDESC_NAME, S_IFCHR, instance, 233*0Sstevel@tonic-gate DDI_PSEUDO, 0) != DDI_SUCCESS) { 234*0Sstevel@tonic-gate cmn_err(CE_WARN, "%s@%d: Unable to create minor node", 235*0Sstevel@tonic-gate MDESC_NAME, instance); 236*0Sstevel@tonic-gate (void) mdesc_detach(dip, DDI_DETACH); 237*0Sstevel@tonic-gate return (DDI_FAILURE); 238*0Sstevel@tonic-gate } 239*0Sstevel@tonic-gate mdsp->flags |= MDESC_DIDMINOR; 240*0Sstevel@tonic-gate 241*0Sstevel@tonic-gate mdsp->instance = instance; 242*0Sstevel@tonic-gate mdsp->devi = dip; 243*0Sstevel@tonic-gate 244*0Sstevel@tonic-gate mutex_init(&mdsp->lock, NULL, MUTEX_DRIVER, NULL); 245*0Sstevel@tonic-gate mdsp->flags |= MDESC_DIDMUTEX; 246*0Sstevel@tonic-gate 247*0Sstevel@tonic-gate cv_init(&mdsp->cv, NULL, CV_DRIVER, NULL); 248*0Sstevel@tonic-gate mdsp->flags |= MDESC_DIDCV; 249*0Sstevel@tonic-gate 250*0Sstevel@tonic-gate /* point the driver at the kernel's copy of the data */ 251*0Sstevel@tonic-gate mdsp->mdesc = (uint8_t *)machine_descrip.va; 252*0Sstevel@tonic-gate mdsp->mdesc_len = (machine_descrip.va != NULL) ? 253*0Sstevel@tonic-gate machine_descrip.size : 0; 254*0Sstevel@tonic-gate 255*0Sstevel@tonic-gate ddi_report_dev(dip); 256*0Sstevel@tonic-gate return (DDI_SUCCESS); 257*0Sstevel@tonic-gate case DDI_RESUME: 258*0Sstevel@tonic-gate return (DDI_SUCCESS); 259*0Sstevel@tonic-gate default: 260*0Sstevel@tonic-gate return (DDI_FAILURE); 261*0Sstevel@tonic-gate } 262*0Sstevel@tonic-gate } 263*0Sstevel@tonic-gate 264*0Sstevel@tonic-gate 265*0Sstevel@tonic-gate 266*0Sstevel@tonic-gate static int 267*0Sstevel@tonic-gate mdesc_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 268*0Sstevel@tonic-gate { 269*0Sstevel@tonic-gate int instance = ddi_get_instance(dip); 270*0Sstevel@tonic-gate struct mdesc_state *mdsp; 271*0Sstevel@tonic-gate 272*0Sstevel@tonic-gate switch (cmd) { 273*0Sstevel@tonic-gate case DDI_DETACH: 274*0Sstevel@tonic-gate mdsp = ddi_get_soft_state(mdesc_state_head, instance); 275*0Sstevel@tonic-gate if (mdsp != NULL) { 276*0Sstevel@tonic-gate ASSERT(!(mdsp->flags & MDESC_BUSY)); 277*0Sstevel@tonic-gate if (mdsp->flags & MDESC_DIDCV) 278*0Sstevel@tonic-gate cv_destroy(&mdsp->cv); 279*0Sstevel@tonic-gate if (mdsp->flags & MDESC_DIDMUTEX) 280*0Sstevel@tonic-gate mutex_destroy(&mdsp->lock); 281*0Sstevel@tonic-gate if (mdsp->flags & MDESC_DIDMINOR) 282*0Sstevel@tonic-gate ddi_remove_minor_node(dip, NULL); 283*0Sstevel@tonic-gate } 284*0Sstevel@tonic-gate ddi_soft_state_free(mdesc_state_head, instance); 285*0Sstevel@tonic-gate return (DDI_SUCCESS); 286*0Sstevel@tonic-gate 287*0Sstevel@tonic-gate case DDI_SUSPEND: 288*0Sstevel@tonic-gate return (DDI_SUCCESS); 289*0Sstevel@tonic-gate 290*0Sstevel@tonic-gate default: 291*0Sstevel@tonic-gate return (DDI_FAILURE); 292*0Sstevel@tonic-gate } 293*0Sstevel@tonic-gate } 294*0Sstevel@tonic-gate 295*0Sstevel@tonic-gate 296*0Sstevel@tonic-gate 297*0Sstevel@tonic-gate /*ARGSUSED*/ 298*0Sstevel@tonic-gate static int 299*0Sstevel@tonic-gate mdesc_open(dev_t *devp, int flag, int otyp, cred_t *credp) 300*0Sstevel@tonic-gate { 301*0Sstevel@tonic-gate int instance = getminor(*devp); 302*0Sstevel@tonic-gate struct mdesc_state *mdsp; 303*0Sstevel@tonic-gate 304*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL) 305*0Sstevel@tonic-gate return (ENXIO); 306*0Sstevel@tonic-gate 307*0Sstevel@tonic-gate ASSERT(mdsp->instance == instance); 308*0Sstevel@tonic-gate 309*0Sstevel@tonic-gate if (otyp != OTYP_CHR) 310*0Sstevel@tonic-gate return (EINVAL); 311*0Sstevel@tonic-gate 312*0Sstevel@tonic-gate return (0); 313*0Sstevel@tonic-gate } 314*0Sstevel@tonic-gate 315*0Sstevel@tonic-gate 316*0Sstevel@tonic-gate 317*0Sstevel@tonic-gate 318*0Sstevel@tonic-gate /*ARGSUSED*/ 319*0Sstevel@tonic-gate static int 320*0Sstevel@tonic-gate mdesc_close(dev_t dev, int flag, int otyp, cred_t *credp) 321*0Sstevel@tonic-gate { 322*0Sstevel@tonic-gate struct mdesc_state *mdsp; 323*0Sstevel@tonic-gate int instance = getminor(dev); 324*0Sstevel@tonic-gate 325*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL) 326*0Sstevel@tonic-gate return (ENXIO); 327*0Sstevel@tonic-gate 328*0Sstevel@tonic-gate ASSERT(mdsp->instance == instance); 329*0Sstevel@tonic-gate 330*0Sstevel@tonic-gate if (otyp != OTYP_CHR) 331*0Sstevel@tonic-gate return (EINVAL); 332*0Sstevel@tonic-gate 333*0Sstevel@tonic-gate return (0); 334*0Sstevel@tonic-gate } 335*0Sstevel@tonic-gate 336*0Sstevel@tonic-gate 337*0Sstevel@tonic-gate 338*0Sstevel@tonic-gate 339*0Sstevel@tonic-gate /*ARGSUSED*/ 340*0Sstevel@tonic-gate static int 341*0Sstevel@tonic-gate mdesc_read(dev_t dev, struct uio *uiop, cred_t *credp) 342*0Sstevel@tonic-gate { 343*0Sstevel@tonic-gate return (mdesc_rw(dev, uiop, UIO_READ)); 344*0Sstevel@tonic-gate } 345*0Sstevel@tonic-gate 346*0Sstevel@tonic-gate 347*0Sstevel@tonic-gate 348*0Sstevel@tonic-gate 349*0Sstevel@tonic-gate /*ARGSUSED*/ 350*0Sstevel@tonic-gate static int 351*0Sstevel@tonic-gate mdesc_write(dev_t dev, struct uio *uiop, cred_t *credp) 352*0Sstevel@tonic-gate { 353*0Sstevel@tonic-gate return (ENXIO); /* This driver version does not allow updates */ 354*0Sstevel@tonic-gate } 355*0Sstevel@tonic-gate 356*0Sstevel@tonic-gate 357*0Sstevel@tonic-gate 358*0Sstevel@tonic-gate 359*0Sstevel@tonic-gate static int 360*0Sstevel@tonic-gate mdesc_rw(dev_t dev, struct uio *uiop, enum uio_rw rw) 361*0Sstevel@tonic-gate { 362*0Sstevel@tonic-gate struct mdesc_state *mdsp; 363*0Sstevel@tonic-gate int instance = getminor(dev); 364*0Sstevel@tonic-gate size_t len; 365*0Sstevel@tonic-gate int retval; 366*0Sstevel@tonic-gate 367*0Sstevel@tonic-gate len = uiop->uio_resid; 368*0Sstevel@tonic-gate 369*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL) 370*0Sstevel@tonic-gate return (ENXIO); 371*0Sstevel@tonic-gate 372*0Sstevel@tonic-gate ASSERT(mdsp->instance == instance); 373*0Sstevel@tonic-gate 374*0Sstevel@tonic-gate if (len == 0) 375*0Sstevel@tonic-gate return (0); 376*0Sstevel@tonic-gate 377*0Sstevel@tonic-gate mutex_enter(&mdsp->lock); 378*0Sstevel@tonic-gate 379*0Sstevel@tonic-gate while (mdsp->flags & MDESC_BUSY) { 380*0Sstevel@tonic-gate if (cv_wait_sig(&mdsp->cv, &mdsp->lock) == 0) { 381*0Sstevel@tonic-gate mutex_exit(&mdsp->lock); 382*0Sstevel@tonic-gate return (EINTR); 383*0Sstevel@tonic-gate } 384*0Sstevel@tonic-gate } 385*0Sstevel@tonic-gate 386*0Sstevel@tonic-gate if (uiop->uio_offset < 0 || uiop->uio_offset > mdsp->mdesc_len) { 387*0Sstevel@tonic-gate mutex_exit(&mdsp->lock); 388*0Sstevel@tonic-gate return (EINVAL); 389*0Sstevel@tonic-gate } 390*0Sstevel@tonic-gate 391*0Sstevel@tonic-gate if (len > (mdsp->mdesc_len - uiop->uio_offset)) 392*0Sstevel@tonic-gate len = mdsp->mdesc_len - uiop->uio_offset; 393*0Sstevel@tonic-gate 394*0Sstevel@tonic-gate /* already checked that offset<mdesc_len above */ 395*0Sstevel@tonic-gate if (len == 0) { 396*0Sstevel@tonic-gate mutex_exit(&mdsp->lock); 397*0Sstevel@tonic-gate return (rw == UIO_WRITE ? ENOSPC : 0); 398*0Sstevel@tonic-gate } 399*0Sstevel@tonic-gate 400*0Sstevel@tonic-gate mdsp->flags |= MDESC_BUSY; 401*0Sstevel@tonic-gate mutex_exit(&mdsp->lock); 402*0Sstevel@tonic-gate 403*0Sstevel@tonic-gate retval = uiomove((void *)(mdsp->mdesc + uiop->uio_offset), 404*0Sstevel@tonic-gate len, rw, uiop); 405*0Sstevel@tonic-gate 406*0Sstevel@tonic-gate mutex_enter(&mdsp->lock); 407*0Sstevel@tonic-gate mdsp->flags &= ~MDESC_BUSY; 408*0Sstevel@tonic-gate cv_broadcast(&mdsp->cv); 409*0Sstevel@tonic-gate mutex_exit(&mdsp->lock); 410*0Sstevel@tonic-gate 411*0Sstevel@tonic-gate return (retval); 412*0Sstevel@tonic-gate } 413*0Sstevel@tonic-gate 414*0Sstevel@tonic-gate 415*0Sstevel@tonic-gate 416*0Sstevel@tonic-gate 417*0Sstevel@tonic-gate /*ARGSUSED*/ 418*0Sstevel@tonic-gate static int 419*0Sstevel@tonic-gate mdesc_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 420*0Sstevel@tonic-gate int *rvalp) 421*0Sstevel@tonic-gate { 422*0Sstevel@tonic-gate struct mdesc_state *mdsp; 423*0Sstevel@tonic-gate int instance = getminor(dev); 424*0Sstevel@tonic-gate 425*0Sstevel@tonic-gate if ((mdsp = ddi_get_soft_state(mdesc_state_head, instance)) == NULL) 426*0Sstevel@tonic-gate return (ENXIO); 427*0Sstevel@tonic-gate 428*0Sstevel@tonic-gate ASSERT(mdsp->instance == instance); 429*0Sstevel@tonic-gate 430*0Sstevel@tonic-gate switch (cmd) { 431*0Sstevel@tonic-gate case MDESCIOCGSZ: { 432*0Sstevel@tonic-gate /* 433*0Sstevel@tonic-gate * We are not guaranteed that ddi_copyout(9F) will read 434*0Sstevel@tonic-gate * atomically anything larger than a byte. Therefore we 435*0Sstevel@tonic-gate * must duplicate the size before copying it out to the user. 436*0Sstevel@tonic-gate */ 437*0Sstevel@tonic-gate size_t sz = mdsp->mdesc_len; 438*0Sstevel@tonic-gate 439*0Sstevel@tonic-gate if (!(mode & FREAD)) 440*0Sstevel@tonic-gate return (EACCES); 441*0Sstevel@tonic-gate 442*0Sstevel@tonic-gate #ifdef _MULTI_DATAMODEL 443*0Sstevel@tonic-gate switch (ddi_model_convert_from(mode & FMODELS)) { 444*0Sstevel@tonic-gate case DDI_MODEL_ILP32: { 445*0Sstevel@tonic-gate size32_t sz32 = (size32_t)sz; 446*0Sstevel@tonic-gate if (ddi_copyout(&sz32, (void *)arg, sizeof (size32_t), 447*0Sstevel@tonic-gate mode) != 0) 448*0Sstevel@tonic-gate return (EFAULT); 449*0Sstevel@tonic-gate return (0); 450*0Sstevel@tonic-gate } 451*0Sstevel@tonic-gate case DDI_MODEL_NONE: 452*0Sstevel@tonic-gate if (ddi_copyout(&sz, (void *)arg, sizeof (size_t), 453*0Sstevel@tonic-gate mode) != 0) 454*0Sstevel@tonic-gate return (EFAULT); 455*0Sstevel@tonic-gate return (0); 456*0Sstevel@tonic-gate default: 457*0Sstevel@tonic-gate cmn_err(CE_WARN, 458*0Sstevel@tonic-gate "mdesc: Invalid data model %d in ioctl\n", 459*0Sstevel@tonic-gate ddi_model_convert_from(mode & FMODELS)); 460*0Sstevel@tonic-gate return (ENOTSUP); 461*0Sstevel@tonic-gate } 462*0Sstevel@tonic-gate #else /* ! _MULTI_DATAMODEL */ 463*0Sstevel@tonic-gate if (ddi_copyout(&sz, (void *)arg, sizeof (size_t), mode) != 0) 464*0Sstevel@tonic-gate return (EFAULT); 465*0Sstevel@tonic-gate return (0); 466*0Sstevel@tonic-gate #endif /* _MULTI_DATAMODEL */ 467*0Sstevel@tonic-gate } 468*0Sstevel@tonic-gate 469*0Sstevel@tonic-gate default: 470*0Sstevel@tonic-gate return (ENOTTY); 471*0Sstevel@tonic-gate } 472*0Sstevel@tonic-gate } 473