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