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 (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 /* 25 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 26 */ 27 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 struct cpuid_regs crs; 114 int error = 0; 115 116 if (!is_x86_feature(x86_featureset, X86FSET_CPUID)) 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.cp_eax = (uint32_t)uoff; 131 crs.cp_ebx = crs.cp_ecx = crs.cp_edx = 0; 132 (void) cpuid_insn(NULL, &crs); 133 134 if ((error = uiomove(&crs, sizeof (crs), UIO_READ, uio)) != 0) 135 break; 136 uio->uio_loffset = uoff + 1; 137 } 138 139 return (error); 140 } 141 142 #else 143 144 #define cpuid_read nodev 145 146 #endif /* _HAVE_CPUID_INSN */ 147 148 /*ARGSUSED*/ 149 static int 150 cpuid_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr, int *rval) 151 { 152 char areq[16]; 153 void *ustr; 154 155 switch (cmd) { 156 case CPUID_GET_HWCAP: { 157 STRUCT_DECL(cpuid_get_hwcap, h); 158 159 STRUCT_INIT(h, mode); 160 if (ddi_copyin((void *)arg, 161 STRUCT_BUF(h), STRUCT_SIZE(h), mode)) 162 return (EFAULT); 163 if ((ustr = STRUCT_FGETP(h, cgh_archname)) != NULL && 164 copyinstr(ustr, areq, sizeof (areq), NULL) != 0) 165 return (EFAULT); 166 areq[sizeof (areq) - 1] = '\0'; 167 168 if (strcmp(areq, architecture) == 0) { 169 STRUCT_FSET(h, cgh_hwcap[0], auxv_hwcap); 170 STRUCT_FSET(h, cgh_hwcap[1], auxv_hwcap_2); 171 #if defined(_SYSCALL32_IMPL) 172 } else if (strcmp(areq, architecture_32) == 0) { 173 STRUCT_FSET(h, cgh_hwcap[0], auxv_hwcap32); 174 STRUCT_FSET(h, cgh_hwcap[1], auxv_hwcap32_2); 175 #endif 176 } else { 177 STRUCT_FSET(h, cgh_hwcap[0], 0); 178 STRUCT_FSET(h, cgh_hwcap[1], 0); 179 } 180 if (ddi_copyout(STRUCT_BUF(h), 181 (void *)arg, STRUCT_SIZE(h), mode)) 182 return (EFAULT); 183 return (0); 184 } 185 186 default: 187 return (ENOTTY); 188 } 189 } 190 191 static struct cb_ops cpuid_cb_ops = { 192 cpuid_open, 193 nulldev, /* close */ 194 nodev, /* strategy */ 195 nodev, /* print */ 196 nodev, /* dump */ 197 cpuid_read, 198 nodev, /* write */ 199 cpuid_ioctl, 200 nodev, /* devmap */ 201 nodev, /* mmap */ 202 nodev, /* segmap */ 203 nochpoll, /* poll */ 204 ddi_prop_op, 205 NULL, 206 D_64BIT | D_NEW | D_MP 207 }; 208 209 static struct dev_ops cpuid_dv_ops = { 210 DEVO_REV, 211 0, 212 cpuid_getinfo, 213 nulldev, /* identify */ 214 nulldev, /* probe */ 215 cpuid_attach, 216 cpuid_detach, 217 nodev, /* reset */ 218 &cpuid_cb_ops, 219 (struct bus_ops *)0, 220 NULL, 221 ddi_quiesce_not_needed, /* quiesce */ 222 }; 223 224 static struct modldrv modldrv = { 225 &mod_driverops, 226 "cpuid driver", 227 &cpuid_dv_ops 228 }; 229 230 static struct modlinkage modl = { 231 MODREV_1, 232 &modldrv 233 }; 234 235 int 236 _init(void) 237 { 238 return (mod_install(&modl)); 239 } 240 241 int 242 _fini(void) 243 { 244 return (mod_remove(&modl)); 245 } 246 247 int 248 _info(struct modinfo *modinfo) 249 { 250 return (mod_info(&modl, modinfo)); 251 } 252