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 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/bus.h> 33 #include <sys/conf.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 38 #include <machine/efi.h> 39 #include <sys/efiio.h> 40 41 static d_ioctl_t efidev_ioctl; 42 43 static struct cdevsw efi_cdevsw = { 44 .d_name = "efi", 45 .d_version = D_VERSION, 46 .d_ioctl = efidev_ioctl, 47 }; 48 49 static int 50 efidev_ioctl(struct cdev *dev __unused, u_long cmd, caddr_t addr, 51 int flags __unused, struct thread *td __unused) 52 { 53 int error; 54 55 switch (cmd) { 56 case EFIIOC_GET_TABLE: 57 { 58 struct efi_get_table_ioc *egtioc = 59 (struct efi_get_table_ioc *)addr; 60 void *buf = NULL; 61 62 error = efi_copy_table(&egtioc->uuid, egtioc->buf ? &buf : NULL, 63 egtioc->buf_len, &egtioc->table_len); 64 65 if (error != 0 || egtioc->buf == NULL) 66 break; 67 68 if (egtioc->buf_len < egtioc->table_len) { 69 error = EINVAL; 70 free(buf, M_TEMP); 71 break; 72 } 73 74 error = copyout(buf, egtioc->buf, egtioc->buf_len); 75 free(buf, M_TEMP); 76 77 break; 78 } 79 case EFIIOC_GET_TIME: 80 { 81 struct efi_tm *tm = (struct efi_tm *)addr; 82 83 error = efi_get_time(tm); 84 break; 85 } 86 case EFIIOC_SET_TIME: 87 { 88 struct efi_tm *tm = (struct efi_tm *)addr; 89 90 error = efi_set_time(tm); 91 break; 92 } 93 case EFIIOC_VAR_GET: 94 { 95 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 96 void *data; 97 efi_char *name; 98 99 data = malloc(ev->datasize, M_TEMP, M_WAITOK); 100 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 101 error = copyin(ev->name, name, ev->namesize); 102 if (error) 103 goto vg_out; 104 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) { 105 error = EINVAL; 106 goto vg_out; 107 } 108 109 error = efi_var_get(name, &ev->vendor, &ev->attrib, 110 &ev->datasize, data); 111 112 if (error == 0) { 113 error = copyout(data, ev->data, ev->datasize); 114 } else if (error == EOVERFLOW) { 115 /* 116 * Pass back the size we really need, but 117 * convert the error to 0 so the copyout 118 * happens. datasize was updated in the 119 * efi_var_get call. 120 */ 121 ev->data = NULL; 122 error = 0; 123 } 124 vg_out: 125 free(data, M_TEMP); 126 free(name, M_TEMP); 127 break; 128 } 129 case EFIIOC_VAR_NEXT: 130 { 131 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 132 efi_char *name; 133 134 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 135 error = copyin(ev->name, name, ev->namesize); 136 if (error) 137 goto vn_out; 138 /* Note: namesize is the buffer size, not the string lenght */ 139 140 error = efi_var_nextname(&ev->namesize, name, &ev->vendor); 141 if (error == 0) { 142 error = copyout(name, ev->name, ev->namesize); 143 } else if (error == EOVERFLOW) { 144 ev->name = NULL; 145 error = 0; 146 } 147 vn_out: 148 free(name, M_TEMP); 149 break; 150 } 151 case EFIIOC_VAR_SET: 152 { 153 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr; 154 void *data = NULL; 155 efi_char *name; 156 157 /* datasize == 0 -> delete (more or less) */ 158 if (ev->datasize > 0) 159 data = malloc(ev->datasize, M_TEMP, M_WAITOK); 160 name = malloc(ev->namesize, M_TEMP, M_WAITOK); 161 if (ev->datasize) { 162 error = copyin(ev->data, data, ev->datasize); 163 if (error) 164 goto vs_out; 165 } 166 error = copyin(ev->name, name, ev->namesize); 167 if (error) 168 goto vs_out; 169 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) { 170 error = EINVAL; 171 goto vs_out; 172 } 173 174 error = efi_var_set(name, &ev->vendor, ev->attrib, ev->datasize, 175 data); 176 vs_out: 177 free(data, M_TEMP); 178 free(name, M_TEMP); 179 break; 180 } 181 default: 182 error = ENOTTY; 183 break; 184 } 185 186 return (error); 187 } 188 189 static struct cdev *efidev; 190 191 static int 192 efidev_modevents(module_t m, int event, void *arg __unused) 193 { 194 struct make_dev_args mda; 195 int error; 196 197 switch (event) { 198 case MOD_LOAD: 199 /* 200 * If we have no efi environment, then don't create the device. 201 */ 202 if (efi_rt_ok() != 0) 203 return (0); 204 make_dev_args_init(&mda); 205 mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME; 206 mda.mda_devsw = &efi_cdevsw; 207 mda.mda_uid = UID_ROOT; 208 mda.mda_gid = GID_WHEEL; 209 mda.mda_mode = 0700; 210 error = make_dev_s(&mda, &efidev, "efi"); 211 return (error); 212 213 case MOD_UNLOAD: 214 if (efidev != NULL) 215 destroy_dev(efidev); 216 efidev = NULL; 217 return (0); 218 219 case MOD_SHUTDOWN: 220 return (0); 221 222 default: 223 return (EOPNOTSUPP); 224 } 225 } 226 227 static moduledata_t efidev_moddata = { 228 .name = "efidev", 229 .evhand = efidev_modevents, 230 .priv = NULL, 231 }; 232 233 DECLARE_MODULE(efidev, efidev_moddata, SI_SUB_DRIVERS, SI_ORDER_ANY); 234 MODULE_VERSION(efidev, 1); 235 MODULE_DEPEND(efidev, efirt, 1, 1, 1); 236