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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 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 #include <sys/types.h> 30 #include <sys/file.h> 31 #include <sys/errno.h> 32 #include <sys/open.h> 33 #include <sys/cred.h> 34 #include <sys/conf.h> 35 #include <sys/stat.h> 36 #include <sys/processor.h> 37 #include <sys/cpuvar.h> 38 #include <sys/kmem.h> 39 #include <sys/modctl.h> 40 #include <sys/ddi.h> 41 #include <sys/sunddi.h> 42 43 #include <sys/auxv.h> 44 #include <sys/cpuid_drv.h> 45 #include <sys/systeminfo.h> 46 47 #if defined(__x86) 48 #include <sys/x86_archext.h> 49 #endif 50 51 static dev_info_t *cpuid_devi; 52 53 /*ARGSUSED*/ 54 static int 55 cpuid_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result) 56 { 57 switch (cmd) { 58 case DDI_INFO_DEVT2DEVINFO: 59 case DDI_INFO_DEVT2INSTANCE: 60 break; 61 default: 62 return (DDI_FAILURE); 63 } 64 65 switch (getminor((dev_t)arg)) { 66 case CPUID_SELF_CPUID_MINOR: 67 break; 68 default: 69 return (DDI_FAILURE); 70 } 71 72 if (cmd == DDI_INFO_DEVT2INSTANCE) 73 *result = 0; 74 else 75 *result = cpuid_devi; 76 return (DDI_SUCCESS); 77 } 78 79 static int 80 cpuid_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 81 { 82 if (cmd != DDI_ATTACH) 83 return (DDI_FAILURE); 84 cpuid_devi = devi; 85 86 return (ddi_create_minor_node(devi, CPUID_DRIVER_SELF_NODE, S_IFCHR, 87 CPUID_SELF_CPUID_MINOR, DDI_PSEUDO, 0)); 88 } 89 90 static int 91 cpuid_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 92 { 93 if (cmd != DDI_DETACH) 94 return (DDI_FAILURE); 95 ddi_remove_minor_node(devi, NULL); 96 cpuid_devi = NULL; 97 return (DDI_SUCCESS); 98 } 99 100 /*ARGSUSED1*/ 101 static int 102 cpuid_open(dev_t *dev, int flag, int otyp, cred_t *cr) 103 { 104 return (getminor(*dev) == CPUID_SELF_CPUID_MINOR ? 0 : ENXIO); 105 } 106 107 #if defined(_HAVE_CPUID_INSN) 108 109 /*ARGSUSED*/ 110 static int 111 cpuid_read(dev_t dev, uio_t *uio, cred_t *cr) 112 { 113 uint32_t crs[4]; 114 int error = 0; 115 116 if ((x86_feature & X86_CPUID) == 0) 117 return (ENXIO); 118 119 if (uio->uio_resid & (sizeof (crs) - 1)) 120 return (EINVAL); 121 122 while (uio->uio_resid > 0) { 123 u_offset_t uoff; 124 125 if ((uoff = (u_offset_t)uio->uio_loffset) > UINT_MAX) { 126 error = EINVAL; 127 break; 128 } 129 130 crs[0] = cpuid_insn(NULL, 131 (uint32_t)uoff, &crs[1], &crs[2], &crs[3]); 132 133 if ((error = uiomove(crs, sizeof (crs), UIO_READ, uio)) != 0) 134 break; 135 uio->uio_loffset = uoff + 1; 136 } 137 138 return (error); 139 } 140 141 #else 142 143 #define cpuid_read nodev 144 145 #endif /* _HAVE_CPUID_INSN */ 146 147 /*ARGSUSED*/ 148 static int 149 cpuid_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr, int *rval) 150 { 151 char areq[16]; 152 void *ustr; 153 154 switch (cmd) { 155 case CPUID_GET_HWCAP: { 156 STRUCT_DECL(cpuid_get_hwcap, h); 157 158 STRUCT_INIT(h, mode); 159 if (ddi_copyin((void *)arg, 160 STRUCT_BUF(h), STRUCT_SIZE(h), mode)) 161 return (EFAULT); 162 if ((ustr = STRUCT_FGETP(h, cgh_archname)) != NULL && 163 copyinstr(ustr, areq, sizeof (areq), NULL) != 0) 164 return (EFAULT); 165 areq[sizeof (areq) - 1] = '\0'; 166 167 if (strcmp(areq, architecture) == 0) 168 STRUCT_FSET(h, cgh_hwcap, auxv_hwcap); 169 #if defined(_SYSCALL32_IMPL) 170 else if (strcmp(areq, architecture_32) == 0) 171 STRUCT_FSET(h, cgh_hwcap, auxv_hwcap32); 172 #endif 173 else 174 STRUCT_FSET(h, cgh_hwcap, 0); 175 if (ddi_copyout(STRUCT_BUF(h), 176 (void *)arg, STRUCT_SIZE(h), mode)) 177 return (EFAULT); 178 return (0); 179 } 180 181 default: 182 return (ENOTTY); 183 } 184 } 185 186 static struct cb_ops cpuid_cb_ops = { 187 cpuid_open, 188 nulldev, /* close */ 189 nodev, /* strategy */ 190 nodev, /* print */ 191 nodev, /* dump */ 192 cpuid_read, 193 nodev, /* write */ 194 cpuid_ioctl, 195 nodev, /* devmap */ 196 nodev, /* mmap */ 197 nodev, /* segmap */ 198 nochpoll, /* poll */ 199 ddi_prop_op, 200 NULL, 201 D_64BIT | D_NEW | D_MP 202 }; 203 204 static struct dev_ops cpuid_dv_ops = { 205 DEVO_REV, 206 0, 207 cpuid_getinfo, 208 nulldev, /* identify */ 209 nulldev, /* probe */ 210 cpuid_attach, 211 cpuid_detach, 212 nodev, /* reset */ 213 &cpuid_cb_ops, 214 (struct bus_ops *)0 215 }; 216 217 static struct modldrv modldrv = { 218 &mod_driverops, 219 "cpuid driver v%I%", 220 &cpuid_dv_ops 221 }; 222 223 static struct modlinkage modl = { 224 MODREV_1, 225 &modldrv 226 }; 227 228 int 229 _init(void) 230 { 231 return (mod_install(&modl)); 232 } 233 234 int 235 _fini(void) 236 { 237 return (mod_remove(&modl)); 238 } 239 240 int 241 _info(struct modinfo *modinfo) 242 { 243 return (mod_info(&modl, modinfo)); 244 } 245