1 /*- 2 * Copyright (c) 2016 Netflix, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer 9 * in this position and unchanged. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/kernel.h> 30 #include <sys/bus.h> 31 #include <sys/conf.h> 32 #include <sys/lock.h> 33 #include <sys/malloc.h> 34 #include <sys/module.h> 35 36 #include <machine/efi.h> 37 #include <sys/efiio.h> 38 39 static d_ioctl_t efidev_ioctl; 40 41 static struct cdevsw efi_cdevsw = { 42 .d_name = "efi", 43 .d_version = D_VERSION, 44 .d_ioctl = efidev_ioctl, 45 }; 46 47 static int 48 efidev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr, 49 int flags __unused, struct thread *td __unused) 50 { 51 int error; 52 53 switch (cmd) { 54 case EFIIOC_GET_TABLE: 55 { 56 struct efi_get_table_ioc *egtioc = 57 (struct efi_get_table_ioc *)addr; 58 void *buf = NULL; 59 60 error = efi_copy_table(&egtioc->uuid, egtioc->buf ? &buf : NULL, 61 egtioc->buf_len, &egtioc->table_len); 62 63 if (error != 0 || egtioc->buf == NULL) 64 break; 65 66 if (egtioc->buf_len < egtioc->table_len) { 67 error = EINVAL; 68 free(buf, M_TEMP); 69 break; 70 } 71 72 error = copyout(buf, egtioc->buf, egtioc->buf_len); 73 free(buf, M_TEMP); 74 75 break; 76 } 77 case EFIIOC_GET_TIME: 78 { 79 struct efi_tm *tm = (struct efi_tm *)addr; 80 81 error = efi_get_time(tm); 82 break; 83 } 84 case EFIIOC_SET_TIME: 85 { 86 struct efi_tm *tm = (struct efi_tm *)addr; 87 88 error = efi_set_time(tm); 89 break; 90 } 91 case EFIIOC_GET_WAKETIME: 92 { 93 struct efi_waketime_ioc *wt = (struct efi_waketime_ioc *)addr; 94 95 error = efi_get_waketime(&wt->enabled, &wt->pending, 96 &wt->waketime); 97 break; 98 } 99 case EFIIOC_SET_WAKETIME: 100 { 101 struct efi_waketime_ioc *wt = (struct efi_waketime_ioc *)addr; 102 103 error = efi_set_waketime(wt->enabled, &wt->waketime); 104 break; 105 } 106 case EFIIOC_VAR_GET: 107 { 108 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 109 void *data; 110 efi_char *name; 111 112 data = malloc(ev->datasize, M_TEMP, M_WAITOK); 113 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 114 error = copyin(ev->name, name, ev->namesize); 115 if (error) 116 goto vg_out; 117 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) { 118 error = EINVAL; 119 goto vg_out; 120 } 121 122 error = efi_var_get(name, &ev->vendor, &ev->attrib, 123 &ev->datasize, data); 124 125 if (error == 0) { 126 error = copyout(data, ev->data, ev->datasize); 127 } else if (error == EOVERFLOW) { 128 /* 129 * Pass back the size we really need, but 130 * convert the error to 0 so the copyout 131 * happens. datasize was updated in the 132 * efi_var_get call. 133 */ 134 ev->data = NULL; 135 error = 0; 136 } 137 vg_out: 138 free(data, M_TEMP); 139 free(name, M_TEMP); 140 break; 141 } 142 case EFIIOC_VAR_NEXT: 143 { 144 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 145 efi_char *name; 146 147 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 148 error = copyin(ev->name, name, ev->namesize); 149 if (error) 150 goto vn_out; 151 /* Note: namesize is the buffer size, not the string lenght */ 152 153 error = efi_var_nextname(&ev->namesize, name, &ev->vendor); 154 if (error == 0) { 155 error = copyout(name, ev->name, ev->namesize); 156 } else if (error == EOVERFLOW) { 157 ev->name = NULL; 158 error = 0; 159 } 160 vn_out: 161 free(name, M_TEMP); 162 break; 163 } 164 case EFIIOC_VAR_SET: 165 { 166 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 167 void *data = NULL; 168 efi_char *name; 169 170 /* datasize == 0 -> delete (more or less) */ 171 if (ev->datasize > 0) 172 data = malloc(ev->datasize, M_TEMP, M_WAITOK); 173 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 174 if (ev->datasize) { 175 error = copyin(ev->data, data, ev->datasize); 176 if (error) 177 goto vs_out; 178 } 179 error = copyin(ev->name, name, ev->namesize); 180 if (error) 181 goto vs_out; 182 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) { 183 error = EINVAL; 184 goto vs_out; 185 } 186 187 error = efi_var_set(name, &ev->vendor, ev->attrib, ev->datasize, 188 data); 189 vs_out: 190 free(data, M_TEMP); 191 free(name, M_TEMP); 192 break; 193 } 194 default: 195 error = ENOTTY; 196 break; 197 } 198 199 return (error); 200 } 201 202 static struct cdev *efidev; 203 204 static int 205 efidev_modevents(module_t m, int event, void *arg __unused) 206 { 207 struct make_dev_args mda; 208 int error; 209 210 switch (event) { 211 case MOD_LOAD: 212 /* 213 * If we have no efi environment, then don't create the device. 214 */ 215 if (efi_rt_ok() != 0) 216 return (0); 217 make_dev_args_init(&mda); 218 mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME; 219 mda.mda_devsw = &efi_cdevsw; 220 mda.mda_uid = UID_ROOT; 221 mda.mda_gid = GID_WHEEL; 222 mda.mda_mode = 0700; 223 error = make_dev_s(&mda, &efidev, "efi"); 224 return (error); 225 226 case MOD_UNLOAD: 227 if (efidev != NULL) 228 destroy_dev(efidev); 229 efidev = NULL; 230 return (0); 231 232 case MOD_SHUTDOWN: 233 return (0); 234 235 default: 236 return (EOPNOTSUPP); 237 } 238 } 239 240 static moduledata_t efidev_moddata = { 241 .name = "efidev", 242 .evhand = efidev_modevents, 243 .priv = NULL, 244 }; 245 246 DECLARE_MODULE(efidev, efidev_moddata, SI_SUB_DRIVERS, SI_ORDER_ANY); 247 MODULE_VERSION(efidev, 1); 248 MODULE_DEPEND(efidev, efirt, 1, 1, 1); 249