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/page.h>
  31
  32 #include <asm/xen/hypercall.h>
  33
  34 #define INIT_EFI_OP(name) \
  35         {.cmd = XENPF_efi_runtime_call, \
  36          .u.efi_runtime_call.function = XEN_EFI_##name, \
  37          .u.efi_runtime_call.misc = 0}
  38
  39 #define efi_data(op)    (op.u.efi_runtime_call)
  40
  41 static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
  42 {
  43         struct xen_platform_op op = INIT_EFI_OP(get_time);
  44
  45         if (HYPERVISOR_dom0_op(&op) < 0)
  46                 return EFI_UNSUPPORTED;
  47
  48         if (tm) {
  49                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));
  50                 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));
  51         }
  52
  53         if (tc) {
  54                 tc->resolution = efi_data(op).u.get_time.resolution;
  55                 tc->accuracy = efi_data(op).u.get_time.accuracy;
  56                 tc->sets_to_zero = !!(efi_data(op).misc &
  57                                       XEN_EFI_GET_TIME_SET_CLEARS_NS);
  58         }
  59
  60         return efi_data(op).status;
  61 }
  62
  63 static efi_status_t xen_efi_set_time(efi_time_t *tm)
  64 {
  65         struct xen_platform_op op = INIT_EFI_OP(set_time);
  66
  67         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));
  68         memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));
  69
  70         if (HYPERVISOR_dom0_op(&op) < 0)
  71                 return EFI_UNSUPPORTED;
  72
  73         return efi_data(op).status;
  74 }
  75
  76 static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
  77                                             efi_bool_t *pending,
  78                                             efi_time_t *tm)
  79 {
  80         struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
  81
  82         if (HYPERVISOR_dom0_op(&op) < 0)
  83                 return EFI_UNSUPPORTED;
  84
  85         if (tm) {
  86                 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));
  87                 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));
  88         }
  89
  90         if (enabled)
  91                 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);
  92
  93         if (pending)
  94                 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);
  95
  96         return efi_data(op).status;
  97 }
  98
  99 static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 100 {
 101         struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
 102
 103         BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));
 104         if (enabled)
 105                 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;
 106         if (tm)
 107                 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));
 108         else
 109                 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;
 110
 111         if (HYPERVISOR_dom0_op(&op) < 0)
 112                 return EFI_UNSUPPORTED;
 113
 114         return efi_data(op).status;
 115 }
 116
 117 static efi_status_t xen_efi_get_variable(efi_char16_t *name,
 118                                          efi_guid_t *vendor,
 119                                          u32 *attr,
 120                                          unsigned long *data_size,
 121                                          void *data)
 122 {
 123         struct xen_platform_op op = INIT_EFI_OP(get_variable);
 124
 125         set_xen_guest_handle(efi_data(op).u.get_variable.name, name);
 126         BUILD_BUG_ON(sizeof(*vendor) !=
 127                      sizeof(efi_data(op).u.get_variable.vendor_guid));
 128         memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor));
 129         efi_data(op).u.get_variable.size = *data_size;
 130         set_xen_guest_handle(efi_data(op).u.get_variable.data, data);
 131
 132         if (HYPERVISOR_dom0_op(&op) < 0)
 133                 return EFI_UNSUPPORTED;
 134
 135         *data_size = efi_data(op).u.get_variable.size;
 136         if (attr)
 137                 *attr = efi_data(op).misc;
 138
 139         return efi_data(op).status;
 140 }
 141
 142 static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
 143                                               efi_char16_t *name,
 144                                               efi_guid_t *vendor)
 145 {
 146         struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
 147
 148         efi_data(op).u.get_next_variable_name.size = *name_size;
 149         set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);
 150         BUILD_BUG_ON(sizeof(*vendor) !=
 151                      sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));
 152         memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,
 153                sizeof(*vendor));
 154
 155         if (HYPERVISOR_dom0_op(&op) < 0)
 156                 return EFI_UNSUPPORTED;
 157
 158         *name_size = efi_data(op).u.get_next_variable_name.size;
 159         memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,
 160                sizeof(*vendor));
 161
 162         return efi_data(op).status;
 163 }
 164
 165 static efi_status_t xen_efi_set_variable(efi_char16_t *name,
 166                                          efi_guid_t *vendor,
 167                                          u32 attr,
 168                                          unsigned long data_size,
 169                                          void *data)
 170 {
 171         struct xen_platform_op op = INIT_EFI_OP(set_variable);
 172
 173         set_xen_guest_handle(efi_data(op).u.set_variable.name, name);
 174         efi_data(op).misc = attr;
 175         BUILD_BUG_ON(sizeof(*vendor) !=
 176                      sizeof(efi_data(op).u.set_variable.vendor_guid));
 177         memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));
 178         efi_data(op).u.set_variable.size = data_size;
 179         set_xen_guest_handle(efi_data(op).u.set_variable.data, data);
 180
 181         if (HYPERVISOR_dom0_op(&op) < 0)
 182                 return EFI_UNSUPPORTED;
 183
 184         return efi_data(op).status;
 185 }
 186
 187 static efi_status_t xen_efi_query_variable_info(u32 attr,
 188                                                 u64 *storage_space,
 189                                                 u64 *remaining_space,
 190                                                 u64 *max_variable_size)
 191 {
 192         struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
 193
 194         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 195                 return EFI_UNSUPPORTED;
 196
 197         efi_data(op).u.query_variable_info.attr = attr;
 198
 199         if (HYPERVISOR_dom0_op(&op) < 0)
 200                 return EFI_UNSUPPORTED;
 201
 202         *storage_space = efi_data(op).u.query_variable_info.max_store_size;
 203         *remaining_space = efi_data(op).u.query_variable_info.remain_store_size;
 204         *max_variable_size = efi_data(op).u.query_variable_info.max_size;
 205
 206         return efi_data(op).status;
 207 }
 208
 209 static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
 210 {
 211         struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
 212
 213         if (HYPERVISOR_dom0_op(&op) < 0)
 214                 return EFI_UNSUPPORTED;
 215
 216         *count = efi_data(op).misc;
 217
 218         return efi_data(op).status;
 219 }
 220
 221 static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
 222                                            unsigned long count,
 223                                            unsigned long sg_list)
 224 {
 225         struct xen_platform_op op = INIT_EFI_OP(update_capsule);
 226
 227         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 228                 return EFI_UNSUPPORTED;
 229
 230         set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,
 231                              capsules);
 232         efi_data(op).u.update_capsule.capsule_count = count;
 233         efi_data(op).u.update_capsule.sg_list = sg_list;
 234
 235         if (HYPERVISOR_dom0_op(&op) < 0)
 236                 return EFI_UNSUPPORTED;
 237
 238         return efi_data(op).status;
 239 }
 240
 241 static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 242                                                unsigned long count,
 243                                                u64 *max_size,
 244                                                int *reset_type)
 245 {
 246         struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
 247
 248         if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
 249                 return EFI_UNSUPPORTED;
 250
 251         set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,
 252                                         capsules);
 253         efi_data(op).u.query_capsule_capabilities.capsule_count = count;
 254
 255         if (HYPERVISOR_dom0_op(&op) < 0)
 256                 return EFI_UNSUPPORTED;
 257
 258         *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;
 259         *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;
 260
 261         return efi_data(op).status;
 262 }
 263
 264 static efi_char16_t vendor[100] __initdata;
 265
 266 static efi_system_table_t efi_systab_xen __initdata = {
 267         .hdr = {
 268                 .signature      = EFI_SYSTEM_TABLE_SIGNATURE,
 269                 .revision       = 0, /* Initialized later. */
 270                 .headersize     = 0, /* Ignored by Linux Kernel. */
 271                 .crc32          = 0, /* Ignored by Linux Kernel. */
 272                 .reserved       = 0
 273         },
 274         .fw_vendor      = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
 275         .fw_revision    = 0,                      /* Initialized later. */
 276         .con_in_handle  = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 277         .con_in         = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 278         .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 279         .con_out        = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 280         .stderr_handle  = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 281         .stderr         = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
 282         .runtime        = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
 283                                                   /* Not used under Xen. */
 284         .boottime       = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
 285                                                   /* Not used under Xen. */
 286         .nr_tables      = 0,                      /* Initialized later. */
 287         .tables         = EFI_INVALID_TABLE_ADDR  /* Initialized later. */
 288 };
 289
 290 static const struct efi efi_xen __initconst = {
 291         .systab                   = NULL, /* Initialized later. */
 292         .runtime_version          = 0,    /* Initialized later. */
 293         .mps                      = EFI_INVALID_TABLE_ADDR,
 294         .acpi                     = EFI_INVALID_TABLE_ADDR,
 295         .acpi20                   = EFI_INVALID_TABLE_ADDR,
 296         .smbios                   = EFI_INVALID_TABLE_ADDR,
 297         .smbios3                  = EFI_INVALID_TABLE_ADDR,
 298         .sal_systab               = EFI_INVALID_TABLE_ADDR,
 299         .boot_info                = EFI_INVALID_TABLE_ADDR,
 300         .hcdp                     = EFI_INVALID_TABLE_ADDR,
 301         .uga                      = EFI_INVALID_TABLE_ADDR,
 302         .uv_systab                = EFI_INVALID_TABLE_ADDR,
 303         .fw_vendor                = EFI_INVALID_TABLE_ADDR,
 304         .runtime                  = EFI_INVALID_TABLE_ADDR,
 305         .config_table             = EFI_INVALID_TABLE_ADDR,
 306         .get_time                 = xen_efi_get_time,
 307         .set_time                 = xen_efi_set_time,
 308         .get_wakeup_time          = xen_efi_get_wakeup_time,
 309         .set_wakeup_time          = xen_efi_set_wakeup_time,
 310         .get_variable             = xen_efi_get_variable,
 311         .get_next_variable        = xen_efi_get_next_variable,
 312         .set_variable             = xen_efi_set_variable,
 313         .query_variable_info      = xen_efi_query_variable_info,
 314         .update_capsule           = xen_efi_update_capsule,
 315         .query_capsule_caps       = xen_efi_query_capsule_caps,
 316         .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
 317         .reset_system             = NULL, /* Functionality provided by Xen. */
 318         .set_virtual_address_map  = NULL, /* Not used under Xen. */
 319         .memmap                   = NULL, /* Not used under Xen. */
 320         .flags                    = 0     /* Initialized later. */
 321 };
 322
 323 efi_system_table_t __init *xen_efi_probe(void)
 324 {
 325         struct xen_platform_op op = {
 326                 .cmd = XENPF_firmware_info,
 327                 .u.firmware_info = {
 328                         .type = XEN_FW_EFI_INFO,
 329                         .index = XEN_FW_EFI_CONFIG_TABLE
 330                 }
 331         };
 332         union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
 333
 334         if (!xen_initial_domain() || HYPERVISOR_dom0_op(&op) < 0)
 335                 return NULL;
 336
 337         /* Here we know that Xen runs on EFI platform. */
 338
 339         efi = efi_xen;
 340
 341         efi_systab_xen.tables = info->cfg.addr;
 342         efi_systab_xen.nr_tables = info->cfg.nent;
 343
 344         op.cmd = XENPF_firmware_info;
 345         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 346         op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
 347         info->vendor.bufsz = sizeof(vendor);
 348         set_xen_guest_handle(info->vendor.name, vendor);
 349
 350         if (HYPERVISOR_dom0_op(&op) == 0) {
 351                 efi_systab_xen.fw_vendor = __pa_symbol(vendor);
 352                 efi_systab_xen.fw_revision = info->vendor.revision;
 353         } else
 354                 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
 355
 356         op.cmd = XENPF_firmware_info;
 357         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 358         op.u.firmware_info.index = XEN_FW_EFI_VERSION;
 359
 360         if (HYPERVISOR_dom0_op(&op) == 0)
 361                 efi_systab_xen.hdr.revision = info->version;
 362
 363         op.cmd = XENPF_firmware_info;
 364         op.u.firmware_info.type = XEN_FW_EFI_INFO;
 365         op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
 366
 367         if (HYPERVISOR_dom0_op(&op) == 0)
 368                 efi.runtime_version = info->version;
 369
 370         return &efi_systab_xen;
 371 }