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
  30 #include <asm/xen/hypercall.h>
  31
  32 #define INIT_EFI_OP(name) \
  33         {.cmd = XENPF_efi_runtime_call, \
  34          .u.efi_runtime_call.function = XEN_EFI_##name, \
  35          .u.efi_runtime_call.misc = 0}
  36
  37 #define efi_data(op)    (op.u.efi_runtime_call)
  38
  39 static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  40 {
  41         struct xen_platform_op op = INIT_EFI_OP(get_time);
  42
  43         if (HYPERVISOR_dom0_op(&op) < 0)
  44                 return EFI_UNSUPPORTED;
  45
  46         if (tm) {
  47                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
  48                 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
  49         }
  50
  51         if (tc) {
  52                 tc->resolution = efi_data(op).u.get_time.resolution;
  53                 tc->accuracy = efi_data(op).u.get_time.accuracy;
  54                 tc->sets_to_zero = !!(efi_data(op).misc &
  55                                       XEN_EFI_GET_TIME_SET_CLEARS_NS);
  56         }
  57
  58         return efi_data(op).status;
  59 }
  60
  61 static efi_status_t xen_efi_set_time(efi_time_t *tm)
  62 {
  63         struct xen_platform_op op = INIT_EFI_OP(set_time);
  64
  65         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
  66         memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
  67
  68         if (HYPERVISOR_dom0_op(&op) < 0)
  69                 return EFI_UNSUPPORTED;
  70
  71         return efi_data(op).status;
  72 }
  73
  74 static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
  75                                             efi_bool_t *pending,
  76                                             efi_time_t *tm)
  77 {
  78         struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
  79
  80         if (HYPERVISOR_dom0_op(&op) < 0)
  81                 return EFI_UNSUPPORTED;
  82
  83         if (tm) {
  84                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
  85                 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
  86         }
  87
  88         if (enabled)
  89                 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
  90
  91         if (pending)
  92                 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
  93
  94         return efi_data(op).status;
  95 }
  96
  97 static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
  98 {
  99         struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
 100
 101         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
 102         if (enabled)
 103                 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
 104         if (tm)
 105                 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
 106         else
 107                 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
 108
 109         if (HYPERVISOR_dom0_op(&op) < 0)
 110                 return EFI_UNSUPPORTED;
 111
 112         return efi_data(op).status;
 113 }
 114
 115 static efi_status_t xen_efi_get_variable(efi_char16_t *name,
 116                                          efi_guid_t *vendor,
 117                                          u32 *attr,
 118                                          unsigned long *data_size,
 119                                          void *data)
 120 {
 121         struct xen_platform_op op = INIT_EFI_OP(get_variable);
 122
 123         set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
 124         BUILD_BUG_ON(sizeof(*vendor) !=
 125                      sizeof(efi_data(op).u.get_variable.vendor_guid));
 126         memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
 127         efi_data(op).u.get_variable.size = *data_size;
 128         set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
 129
 130         if (HYPERVISOR_dom0_op(&op) < 0)
 131                 return EFI_UNSUPPORTED;
 132
 133         *data_size = efi_data(op).u.get_variable.size;
 134         if (attr)
 135                 *attr = efi_data(op).misc;
 136
 137         return efi_data(op).status;
 138 }
 139
 140 static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
 141                                               efi_char16_t *name,
 142                                               efi_guid_t *vendor)
 143 {
 144         struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
 145
 146         efi_data(op).u.get_next_variable_name.size = *name_size;
 147         set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
 148         BUILD_BUG_ON(sizeof(*vendor) !=
 149                      sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
 150         memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
 151                sizeof(*vendor));
 152
 153         if (HYPERVISOR_dom0_op(&op) < 0)
 154                 return EFI_UNSUPPORTED;
 155
 156         *name_size = efi_data(op).u.get_next_variable_name.size;
 157         memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
 158                sizeof(*vendor));
 159
 160         return efi_data(op).status;
 161 }
 162
 163 static efi_status_t xen_efi_set_variable(efi_char16_t *name,
 164                                          efi_guid_t *vendor,
 165                                          u32 attr,
 166                                          unsigned long data_size,
 167                                          void *data)
 168 {
 169         struct xen_platform_op op = INIT_EFI_OP(set_variable);
 170
 171         set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
 172         efi_data(op).misc = attr;
 173         BUILD_BUG_ON(sizeof(*vendor) !=
 174                      sizeof(efi_data(op).u.set_variable.vendor_guid));
 175         memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
 176         efi_data(op).u.set_variable.size = data_size;
 177         set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
 178
 179         if (HYPERVISOR_dom0_op(&op) < 0)
 180                 return EFI_UNSUPPORTED;
 181
 182         return efi_data(op).status;
 183 }
 184
 185 static efi_status_t xen_efi_query_variable_info(u32 attr,
 186                                                 u64 *storage_space,
 187                                                 u64 *remaining_space,
 188                                                 u64 *max_variable_size)
 189 {
 190         struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
 191
 192         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 193                 return EFI_UNSUPPORTED;
 194
 195         efi_data(op).u.query_variable_info.attr = attr;
 196
 197         if (HYPERVISOR_dom0_op(&op) < 0)
 198                 return EFI_UNSUPPORTED;
 199
 200         *storage_space = efi_data(op).u.query_variable_info.max_store_size;
 201         *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
 202         *max_variable_size = efi_data(op).u.query_variable_info.max_size;
 203
 204         return efi_data(op).status;
 205 }
 206
 207 static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
 208 {
 209         struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
 210
 211         if (HYPERVISOR_dom0_op(&op) < 0)
 212                 return EFI_UNSUPPORTED;
 213
 214         *count = efi_data(op).misc;
 215
 216         return efi_data(op).status;
 217 }
 218
 219 static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
 220                                            unsigned long count,
 221                                            unsigned long sg_list)
 222 {
 223         struct xen_platform_op op = INIT_EFI_OP(update_capsule);
 224
 225         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 226                 return EFI_UNSUPPORTED;
 227
 228         set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
 229                              capsules);
 230         efi_data(op).u.update_capsule.capsule_count = count;
 231         efi_data(op).u.update_capsule.sg_list = sg_list;
 232
 233         if (HYPERVISOR_dom0_op(&op) < 0)
 234                 return EFI_UNSUPPORTED;
 235
 236         return efi_data(op).status;
 237 }
 238
 239 static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 240                                                unsigned long count,
 241                                                u64 *max_size,
 242                                                int *reset_type)
 243 {
 244         struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
 245
 246         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 247                 return EFI_UNSUPPORTED;
 248
 249         set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
 250                                         capsules);
 251         efi_data(op).u.query_capsule_capabilities.capsule_count = count;
 252
 253         if (HYPERVISOR_dom0_op(&op) < 0)
 254                 return EFI_UNSUPPORTED;
 255
 256         *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
 257         *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
 258
 259         return efi_data(op).status;
 260 }
 261
 262 static efi_char16_t vendor[100] __initdata;
 263
 264 static efi_system_table_t efi_systab_xen __initdata = {
 265         .hdr = {
 266                 .signature      = EFI_SYSTEM_TABLE_SIGNATURE,
 267                 .revision       = 0, /* Initialized later. */
 268                 .headersize     = 0, /* Ignored by Linux Kernel. */
 269                 .crc32          = 0, /* Ignored by Linux Kernel. */
 270                 .reserved       = 0
 271         },
 272         .fw_vendor      = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
 273         .fw_revision    = 0,                      /* Initialized later. */
 274         .con_in_handle  = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 275         .con_in         = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 276         .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 277         .con_out        = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 278         .stderr_handle  = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 279         .stderr         = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 280         .runtime        = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
 281                                                   /* Not used under Xen. */
 282         .boottime       = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
 283                                                   /* Not used under Xen. */
 284         .nr_tables      = 0,                      /* Initialized later. */
 285         .tables         = EFI_INVALID_TABLE_ADDR  /* Initialized later. */
 286 };
 287
 288 static const struct efi efi_xen __initconst = {
 289         .systab                   = NULL, /* Initialized later. */
 290         .runtime_version          = 0,    /* Initialized later. */
 291         .mps                      = EFI_INVALID_TABLE_ADDR,
 292         .acpi                     = EFI_INVALID_TABLE_ADDR,
 293         .acpi20                   = EFI_INVALID_TABLE_ADDR,
 294         .smbios                   = EFI_INVALID_TABLE_ADDR,
 295         .sal_systab               = EFI_INVALID_TABLE_ADDR,
 296         .boot_info                = EFI_INVALID_TABLE_ADDR,
 297         .hcdp                     = EFI_INVALID_TABLE_ADDR,
 298         .uga                      = EFI_INVALID_TABLE_ADDR,
 299         .uv_systab                = EFI_INVALID_TABLE_ADDR,
 300         .fw_vendor                = EFI_INVALID_TABLE_ADDR,
 301         .runtime                  = EFI_INVALID_TABLE_ADDR,
 302         .config_table             = EFI_INVALID_TABLE_ADDR,
 303         .get_time                 = xen_efi_get_time,
 304         .set_time                 = xen_efi_set_time,
 305         .get_wakeup_time          = xen_efi_get_wakeup_time,
 306         .set_wakeup_time          = xen_efi_set_wakeup_time,
 307         .get_variable             = xen_efi_get_variable,
 308         .get_next_variable        = xen_efi_get_next_variable,
 309         .set_variable             = xen_efi_set_variable,
 310         .query_variable_info      = xen_efi_query_variable_info,
 311         .update_capsule           = xen_efi_update_capsule,
 312         .query_capsule_caps       = xen_efi_query_capsule_caps,
 313         .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
 314         .reset_system             = NULL, /* Functionality provided by Xen. */
 315         .set_virtual_address_map  = NULL, /* Not used under Xen. */
 316         .memmap                   = NULL, /* Not used under Xen. */
 317         .flags                    = 0     /* Initialized later. */
 318 };
 319
 320 efi_system_table_t __init *xen_efi_probe(void)
 321 {
 322         struct xen_platform_op op = {
 323                 .cmd = XENPF_firmware_info,
 324                 .u.firmware_info = {
 325                         .type = XEN_FW_EFI_INFO,
 326                         .index = XEN_FW_EFI_CONFIG_TABLE
 327                 }
 328         };
 329         union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
 330
 331         if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op) < 0)
 332                 return NULL;
 333
 334         /* Here we know that Xen runs on EFI platform. */
 335
 336         efi = efi_xen;
 337
 338         efi_systab_xen.tables = info->cfg.addr;
 339         efi_systab_xen.nr_tables = info->cfg.nent;
 340
 341         op.cmd = XENPF_firmware_info;
 342         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 343         op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
 344         info->vendor.bufsz = sizeof(vendor);
 345         set_xen_guest_handle(info->vendor.name, vendor);
 346
 347         if (HYPERVISOR_dom0_op(&op) == 0) {
 348                 efi_systab_xen.fw_vendor = __pa_symbol(vendor);
 349                 efi_systab_xen.fw_revision = info->vendor.revision;
 350         } else
 351                 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
 352
 353         op.cmd = XENPF_firmware_info;
 354         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 355         op.u.firmware_info.index = XEN_FW_EFI_VERSION;
 356
 357         if (HYPERVISOR_dom0_op(&op) == 0)
 358                 efi_systab_xen.hdr.revision = info->version;
 359
 360         op.cmd = XENPF_firmware_info;
 361         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 362         op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
 363
 364         if (HYPERVISOR_dom0_op(&op) == 0)
 365                 efi.runtime_version = info->version;
 366
 367         return &efi_systab_xen;
 368 }