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
efidev_ioctl(struct cdev * dev __unused,u_long cmd,caddr_t addr,int flags __unused,struct thread * td __unused)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_TIME:
57 {
58 struct efi_tm *tm = (struct efi_tm *)addr;
59
60 error = efi_get_time(tm);
61 break;
62 }
63 case EFIIOC_SET_TIME:
64 {
65 struct efi_tm *tm = (struct efi_tm *)addr;
66
67 error = efi_set_time(tm);
68 break;
69 }
70 case EFIIOC_VAR_GET:
71 {
72 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
73 void *data;
74 efi_char *name;
75
76 data = malloc(ev->datasize, M_TEMP, M_WAITOK);
77 name = malloc(ev->namesize, M_TEMP, M_WAITOK);
78 error = copyin(ev->name, name, ev->namesize);
79 if (error)
80 goto vg_out;
81 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
82 error = EINVAL;
83 goto vg_out;
84 }
85
86 error = efi_var_get(name, &ev->vendor, &ev->attrib,
87 &ev->datasize, data);
88
89 if (error == 0) {
90 error = copyout(data, ev->data, ev->datasize);
91 } else if (error == EOVERFLOW) {
92 /*
93 * Pass back the size we really need, but
94 * convert the error to 0 so the copyout
95 * happens. datasize was updated in the
96 * efi_var_get call.
97 */
98 ev->data = NULL;
99 error = 0;
100 }
101 vg_out:
102 free(data, M_TEMP);
103 free(name, M_TEMP);
104 break;
105 }
106 case EFIIOC_VAR_NEXT:
107 {
108 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
109 efi_char *name;
110
111 name = malloc(ev->namesize, M_TEMP, M_WAITOK);
112 error = copyin(ev->name, name, ev->namesize);
113 if (error)
114 goto vn_out;
115 /* Note: namesize is the buffer size, not the string lenght */
116
117 error = efi_var_nextname(&ev->namesize, name, &ev->vendor);
118 if (error == 0) {
119 error = copyout(name, ev->name, ev->namesize);
120 } else if (error == EOVERFLOW) {
121 ev->name = NULL;
122 error = 0;
123 }
124 vn_out:
125 free(name, M_TEMP);
126 break;
127 }
128 case EFIIOC_VAR_SET:
129 {
130 struct efi_var_ioc *ev = (struct efi_var_ioc *)addr;
131 void *data = NULL;
132 efi_char *name;
133
134 /* datasize == 0 -> delete (more or less) */
135 if (ev->datasize > 0)
136 data = malloc(ev->datasize, M_TEMP, M_WAITOK);
137 name = malloc(ev->namesize, M_TEMP, M_WAITOK);
138 if (ev->datasize) {
139 error = copyin(ev->data, data, ev->datasize);
140 if (error)
141 goto vs_out;
142 }
143 error = copyin(ev->name, name, ev->namesize);
144 if (error)
145 goto vs_out;
146 if (name[ev->namesize / sizeof(efi_char) - 1] != 0) {
147 error = EINVAL;
148 goto vs_out;
149 }
150
151 error = efi_var_set(name, &ev->vendor, ev->attrib, ev->datasize,
152 data);
153 vs_out:
154 free(data, M_TEMP);
155 free(name, M_TEMP);
156 break;
157 }
158 default:
159 error = ENOTTY;
160 break;
161 }
162
163 return (error);
164 }
165
166 static struct cdev *efidev;
167
168 static int
efidev_modevents(module_t m,int event,void * arg __unused)169 efidev_modevents(module_t m, int event, void *arg __unused)
170 {
171 struct make_dev_args mda;
172 int error;
173
174 switch (event) {
175 case MOD_LOAD:
176 /*
177 * If we have no efi environment, then don't create the device.
178 */
179 if (efi_rt_ok() != 0)
180 return (0);
181 make_dev_args_init(&mda);
182 mda.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME;
183 mda.mda_devsw = &efi_cdevsw;
184 mda.mda_uid = UID_ROOT;
185 mda.mda_gid = GID_WHEEL;
186 mda.mda_mode = 0700;
187 error = make_dev_s(&mda, &efidev, "efi");
188 return (error);
189
190 case MOD_UNLOAD:
191 if (efidev != NULL)
192 destroy_dev(efidev);
193 efidev = NULL;
194 return (0);
195
196 case MOD_SHUTDOWN:
197 return (0);
198
199 default:
200 return (EOPNOTSUPP);
201 }
202 }
203
204 static moduledata_t efidev_moddata = {
205 .name = "efidev",
206 .evhand = efidev_modevents,
207 .priv = NULL,
208 };
209
210 DECLARE_MODULE(efidev, efidev_moddata, SI_SUB_DRIVERS, SI_ORDER_ANY);
211 MODULE_VERSION(efidev, 1);
212 MODULE_DEPEND(efidev, efirt, 1, 1, 1);
213