1 /*- 2 * Copyright (c) 2021 Citrix Systems R&D 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 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 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/efi.h> 32 #include <sys/eventhandler.h> 33 #include <sys/kernel.h> 34 #include <sys/linker.h> 35 #include <sys/module.h> 36 #include <sys/clock.h> 37 #include <sys/sysctl.h> 38 #include <sys/systm.h> 39 40 #include <xen/xen-os.h> 41 #include <xen/error.h> 42 #include <xen/hypervisor.h> 43 44 #include <xen/interface/platform.h> 45 46 extern char bootmethod[16]; 47 48 static int 49 rt_ok(void) 50 { 51 52 return (0); 53 } 54 55 static int 56 get_time(struct efi_tm *tm) 57 { 58 struct xen_platform_op op = { 59 .cmd = XENPF_efi_runtime_call, 60 .u.efi_runtime_call.function = XEN_EFI_get_time, 61 }; 62 struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call; 63 int error; 64 65 error = HYPERVISOR_platform_op(&op); 66 if (error != 0) 67 return (xen_translate_error(error)); 68 69 tm->tm_year = call->u.get_time.time.year; 70 tm->tm_mon = call->u.get_time.time.month; 71 tm->tm_mday = call->u.get_time.time.day; 72 tm->tm_hour = call->u.get_time.time.hour; 73 tm->tm_min = call->u.get_time.time.min; 74 tm->tm_sec = call->u.get_time.time.sec; 75 tm->tm_nsec = call->u.get_time.time.ns; 76 tm->tm_tz = call->u.get_time.time.tz; 77 tm->tm_dst = call->u.get_time.time.daylight; 78 79 return (efi_status_to_errno(call->status)); 80 } 81 82 static int 83 get_time_capabilities(struct efi_tmcap *tmcap) 84 { 85 struct xen_platform_op op = { 86 .cmd = XENPF_efi_runtime_call, 87 .u.efi_runtime_call.function = XEN_EFI_get_time, 88 }; 89 struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call; 90 int error; 91 92 error = HYPERVISOR_platform_op(&op); 93 if (error != 0) 94 return (xen_translate_error(error)); 95 96 tmcap->tc_res = call->u.get_time.resolution; 97 tmcap->tc_prec = call->u.get_time.accuracy; 98 tmcap->tc_stz = call->misc & XEN_EFI_GET_TIME_SET_CLEARS_NS; 99 100 return (efi_status_to_errno(call->status)); 101 } 102 103 static int 104 set_time(struct efi_tm *tm) 105 { 106 struct xen_platform_op op = { 107 .cmd = XENPF_efi_runtime_call, 108 .u.efi_runtime_call.function = XEN_EFI_get_time, 109 .u.efi_runtime_call.u.set_time.year = tm->tm_year, 110 .u.efi_runtime_call.u.set_time.month = tm->tm_mon, 111 .u.efi_runtime_call.u.set_time.day = tm->tm_mday, 112 .u.efi_runtime_call.u.set_time.hour = tm->tm_hour, 113 .u.efi_runtime_call.u.set_time.min = tm->tm_min, 114 .u.efi_runtime_call.u.set_time.sec = tm->tm_sec, 115 .u.efi_runtime_call.u.set_time.ns = tm->tm_nsec, 116 .u.efi_runtime_call.u.set_time.tz = tm->tm_tz, 117 .u.efi_runtime_call.u.set_time.daylight = tm->tm_dst, 118 }; 119 int error; 120 121 error = HYPERVISOR_platform_op(&op); 122 123 return ((error != 0) ? xen_translate_error(error) : 124 efi_status_to_errno(op.u.efi_runtime_call.status)); 125 } 126 127 static int 128 var_get(efi_char *name, struct uuid *vendor, uint32_t *attrib, 129 size_t *datasize, void *data) 130 { 131 struct xen_platform_op op = { 132 .cmd = XENPF_efi_runtime_call, 133 .u.efi_runtime_call.function = XEN_EFI_get_variable, 134 .u.efi_runtime_call.u.get_variable.size = *datasize, 135 }; 136 struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call; 137 int error; 138 139 CTASSERT(sizeof(*vendor) == sizeof(call->u.get_variable.vendor_guid)); 140 141 memcpy(&call->u.get_variable.vendor_guid, vendor, 142 sizeof(*vendor)); 143 set_xen_guest_handle(call->u.get_variable.name, name); 144 set_xen_guest_handle(call->u.get_variable.data, data); 145 146 error = HYPERVISOR_platform_op(&op); 147 if (error != 0) 148 return (xen_translate_error(error)); 149 150 *attrib = call->misc; 151 *datasize = call->u.get_variable.size; 152 153 return (efi_status_to_errno(call->status)); 154 } 155 156 static int 157 var_nextname(size_t *namesize, efi_char *name, struct uuid *vendor) 158 { 159 struct xen_platform_op op = { 160 .cmd = XENPF_efi_runtime_call, 161 .u.efi_runtime_call.function = XEN_EFI_get_next_variable_name, 162 .u.efi_runtime_call.u.get_next_variable_name.size = *namesize, 163 }; 164 struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call; 165 int error; 166 167 memcpy(&call->u.get_next_variable_name.vendor_guid, vendor, 168 sizeof(*vendor)); 169 set_xen_guest_handle(call->u.get_next_variable_name.name, name); 170 171 error = HYPERVISOR_platform_op(&op); 172 if (error != 0) 173 return (xen_translate_error(error)); 174 175 *namesize = call->u.get_next_variable_name.size; 176 memcpy(vendor, &call->u.get_next_variable_name.vendor_guid, 177 sizeof(*vendor)); 178 179 return (efi_status_to_errno(call->status)); 180 } 181 182 static int 183 var_set(efi_char *name, struct uuid *vendor, uint32_t attrib, 184 size_t datasize, void *data) 185 { 186 struct xen_platform_op op = { 187 .cmd = XENPF_efi_runtime_call, 188 .u.efi_runtime_call.function = XEN_EFI_set_variable, 189 .u.efi_runtime_call.misc = attrib, 190 .u.efi_runtime_call.u.set_variable.size = datasize, 191 }; 192 struct xenpf_efi_runtime_call *call = &op.u.efi_runtime_call; 193 int error; 194 195 memcpy(&call->u.set_variable.vendor_guid, vendor, 196 sizeof(*vendor)); 197 set_xen_guest_handle(call->u.set_variable.name, name); 198 set_xen_guest_handle(call->u.set_variable.data, data); 199 200 error = HYPERVISOR_platform_op(&op); 201 202 return ((error != 0) ? xen_translate_error(error) : 203 efi_status_to_errno(call->status)); 204 } 205 206 const static struct efi_ops pvefi_ops = { 207 .rt_ok = rt_ok, 208 .get_time = get_time, 209 .get_time_capabilities = get_time_capabilities, 210 .set_time = set_time, 211 .var_get = var_get, 212 .var_nextname = var_nextname, 213 .var_set = var_set, 214 }; 215 216 static int 217 modevents(module_t m, int event, void *arg __unused) 218 { 219 const static struct efi_ops *prev; 220 int rt_disabled; 221 222 switch (event) { 223 case MOD_LOAD: 224 rt_disabled = 0; 225 TUNABLE_INT_FETCH("efi.rt.disabled", &rt_disabled); 226 227 if (!xen_initial_domain() || strcmp("UEFI", bootmethod) != 0 || 228 rt_disabled == 1) 229 return (0); 230 231 prev = active_efi_ops; 232 active_efi_ops = &pvefi_ops; 233 return (0); 234 235 case MOD_UNLOAD: 236 if (prev != NULL) 237 active_efi_ops = prev; 238 return (0); 239 240 case MOD_SHUTDOWN: 241 return (0); 242 243 default: 244 return (EOPNOTSUPP); 245 } 246 } 247 248 static moduledata_t moddata = { 249 .name = "pvefirt", 250 .evhand = modevents, 251 .priv = NULL, 252 }; 253 /* After fpuinitstate, before efidev */ 254 DECLARE_MODULE(pvefirt, moddata, SI_SUB_DRIVERS, SI_ORDER_SECOND); 255 MODULE_VERSION(pvefirt, 1); 256