drivers/xen/efi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * EFI support for Xen.
   4  *
   5  * Copyright (C) 1999 VA Linux Systems
   6  * Copyright (C) 1999 Walt Drummond <[email protected]>
   7  * Copyright (C) 1999-2002 Hewlett-Packard Co.
   8  *      David Mosberger-Tang <[email protected]>
   9  *      Stephane Eranian <[email protected]>
  10  * Copyright (C) 2005-2008 Intel Co.
  11  *      Fenghua Yu <[email protected]>
  12  *      Bibo Mao <[email protected]>
  13  *      Chandramouli Narayanan <[email protected]>
  14  *      Huang Ying <[email protected]>
  15  * Copyright (C) 2011 Novell Co.
  16  *      Jan Beulich <[email protected]>
  17  * Copyright (C) 2011-2012 Oracle Co.
  18  *      Liang Tang <[email protected]>
  19  * Copyright (c) 2014 Oracle Co., Daniel Kiper
  20  */
  21
  22 #include <linux/bug.h>
  23 #include <linux/efi.h>
  24 #include <linux/init.h>
  25 #include <linux/string.h>
  26
  27 #include <xen/interface/xen.h>
  28 #include <xen/interface/platform.h>
  29 #include <xen/xen.h>
  30 #include <xen/xen-ops.h>
  31
  32 #include <asm/page.h>
  33
  34 #include <asm/xen/hypercall.h>
  35
  36 #define INIT_EFI_OP(name) \
  37         {.cmd = XENPF_efi_runtime_call, \
  38          .u.efi_runtime_call.function = XEN_EFI_##name, \
  39          .u.efi_runtime_call.misc = 0}
  40
  41 #define efi_data(op)    (op.u.efi_runtime_call)
  42
  43 efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  44 {
  45         struct xen_platform_op op = INIT_EFI_OP(get_time);
  46
  47         if (HYPERVISOR_platform_op(&op) < 0)
  48                 return EFI_UNSUPPORTED;
  49
  50         if (tm) {
  51                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
  52                 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
  53         }
  54
  55         if (tc) {
  56                 tc->resolution = efi_data(op).u.get_time.resolution;
  57                 tc->accuracy = efi_data(op).u.get_time.accuracy;
  58                 tc->sets_to_zero = !!(efi_data(op).misc &
  59                                       XEN_EFI_GET_TIME_SET_CLEARS_NS);
  60         }
  61
  62         return efi_data(op).status;
  63 }
  64 EXPORT_SYMBOL_GPL(xen_efi_get_time);
  65
  66 efi_status_t xen_efi_set_time(efi_time_t *tm)
  67 {
  68         struct xen_platform_op op = INIT_EFI_OP(set_time);
  69
  70         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
  71         memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
  72
  73         if (HYPERVISOR_platform_op(&op) < 0)
  74                 return EFI_UNSUPPORTED;
  75
  76         return efi_data(op).status;
  77 }
  78 EXPORT_SYMBOL_GPL(xen_efi_set_time);
  79
  80 efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
  81                                      efi_time_t *tm)
  82 {
  83         struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
  84
  85         if (HYPERVISOR_platform_op(&op) < 0)
  86                 return EFI_UNSUPPORTED;
  87
  88         if (tm) {
  89                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
  90                 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
  91         }
  92
  93         if (enabled)
  94                 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
  95
  96         if (pending)
  97                 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
  98
  99         return efi_data(op).status;
 100 }
 101 EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
 102
 103 efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 104 {
 105         struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
 106
 107         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
 108         if (enabled)
 109                 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
 110         if (tm)
 111                 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
 112         else
 113                 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
 114
 115         if (HYPERVISOR_platform_op(&op) < 0)
 116                 return EFI_UNSUPPORTED;
 117
 118         return efi_data(op).status;
 119 }
 120 EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
 121
 122 efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
 123                                   u32 *attr, unsigned long *data_size,
 124                                   void *data)
 125 {
 126         struct xen_platform_op op = INIT_EFI_OP(get_variable);
 127
 128         set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
 129         BUILD_BUG_ON(sizeof(*vendor) !=
 130                      sizeof(efi_data(op).u.get_variable.vendor_guid));
 131         memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
 132         efi_data(op).u.get_variable.size = *data_size;
 133         set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
 134
 135         if (HYPERVISOR_platform_op(&op) < 0)
 136                 return EFI_UNSUPPORTED;
 137
 138         *data_size = efi_data(op).u.get_variable.size;
 139         if (attr)
 140                 *attr = efi_data(op).misc;
 141
 142         return efi_data(op).status;
 143 }
 144 EXPORT_SYMBOL_GPL(xen_efi_get_variable);
 145
 146 efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
 147                                        efi_char16_t *name,
 148                                        efi_guid_t *vendor)
 149 {
 150         struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
 151
 152         efi_data(op).u.get_next_variable_name.size = *name_size;
 153         set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
 154         BUILD_BUG_ON(sizeof(*vendor) !=
 155                      sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
 156         memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
 157                sizeof(*vendor));
 158
 159         if (HYPERVISOR_platform_op(&op) < 0)
 160                 return EFI_UNSUPPORTED;
 161
 162         *name_size = efi_data(op).u.get_next_variable_name.size;
 163         memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
 164                sizeof(*vendor));
 165
 166         return efi_data(op).status;
 167 }
 168 EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
 169
 170 efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
 171                                  u32 attr, unsigned long data_size,
 172                                  void *data)
 173 {
 174         struct xen_platform_op op = INIT_EFI_OP(set_variable);
 175
 176         set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
 177         efi_data(op).misc = attr;
 178         BUILD_BUG_ON(sizeof(*vendor) !=
 179                      sizeof(efi_data(op).u.set_variable.vendor_guid));
 180         memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
 181         efi_data(op).u.set_variable.size = data_size;
 182         set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
 183
 184         if (HYPERVISOR_platform_op(&op) < 0)
 185                 return EFI_UNSUPPORTED;
 186
 187         return efi_data(op).status;
 188 }
 189 EXPORT_SYMBOL_GPL(xen_efi_set_variable);
 190
 191 efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
 192                                          u64 *remaining_space,
 193                                          u64 *max_variable_size)
 194 {
 195         struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
 196
 197         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 198                 return EFI_UNSUPPORTED;
 199
 200         efi_data(op).u.query_variable_info.attr = attr;
 201
 202         if (HYPERVISOR_platform_op(&op) < 0)
 203                 return EFI_UNSUPPORTED;
 204
 205         *storage_space = efi_data(op).u.query_variable_info.max_store_size;
 206         *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
 207         *max_variable_size = efi_data(op).u.query_variable_info.max_size;
 208
 209         return efi_data(op).status;
 210 }
 211 EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
 212
 213 efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
 214 {
 215         struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
 216
 217         if (HYPERVISOR_platform_op(&op) < 0)
 218                 return EFI_UNSUPPORTED;
 219
 220         *count = efi_data(op).misc;
 221
 222         return efi_data(op).status;
 223 }
 224 EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
 225
 226 efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
 227                                     unsigned long count, unsigned long sg_list)
 228 {
 229         struct xen_platform_op op = INIT_EFI_OP(update_capsule);
 230
 231         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 232                 return EFI_UNSUPPORTED;
 233
 234         set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
 235                              capsules);
 236         efi_data(op).u.update_capsule.capsule_count = count;
 237         efi_data(op).u.update_capsule.sg_list = sg_list;
 238
 239         if (HYPERVISOR_platform_op(&op) < 0)
 240                 return EFI_UNSUPPORTED;
 241
 242         return efi_data(op).status;
 243 }
 244 EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
 245
 246 efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 247                                         unsigned long count, u64 *max_size,
 248                                         int *reset_type)
 249 {
 250         struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
 251
 252         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 253                 return EFI_UNSUPPORTED;
 254
 255         set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
 256                                         capsules);
 257         efi_data(op).u.query_capsule_capabilities.capsule_count = count;
 258
 259         if (HYPERVISOR_platform_op(&op) < 0)
 260                 return EFI_UNSUPPORTED;
 261
 262         *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
 263         *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
 264
 265         return efi_data(op).status;
 266 }
 267 EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
 268
 269 void xen_efi_reset_system(int reset_type, efi_status_t status,
 270                           unsigned long data_size, efi_char16_t *data)
 271 {
 272         switch (reset_type) {
 273         case EFI_RESET_COLD:
 274         case EFI_RESET_WARM:
 275                 xen_reboot(SHUTDOWN_reboot);
 276                 break;
 277         case EFI_RESET_SHUTDOWN:
 278                 xen_reboot(SHUTDOWN_poweroff);
 279                 break;
 280         default:
 281                 BUG();
 282         }
 283 }
 284 EXPORT_SYMBOL_GPL(xen_efi_reset_system);