drivers/xen/efi.c

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