efi.c 5.5 KB

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  1. /*
  2. * Copyright (c) 2014 Oracle Co., Daniel Kiper
  3. *
  4. * This program is free software; you can redistribute it and/or modify
  5. * it under the terms of the GNU General Public License as published by
  6. * the Free Software Foundation; either version 2 of the License, or
  7. * (at your option) any later version.
  8. *
  9. * This program is distributed in the hope that it will be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12. * GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License along
  15. * with this program. If not, see <http://www.gnu.org/licenses/>.
  16. */
  17. #include <linux/bitops.h>
  18. #include <linux/efi.h>
  19. #include <linux/init.h>
  20. #include <linux/string.h>
  21. #include <xen/xen.h>
  22. #include <xen/xen-ops.h>
  23. #include <xen/interface/platform.h>
  24. #include <asm/page.h>
  25. #include <asm/setup.h>
  26. #include <asm/xen/hypercall.h>
  27. static efi_char16_t vendor[100] __initdata;
  28. static efi_system_table_t efi_systab_xen __initdata = {
  29. .hdr = {
  30. .signature = EFI_SYSTEM_TABLE_SIGNATURE,
  31. .revision = 0, /* Initialized later. */
  32. .headersize = 0, /* Ignored by Linux Kernel. */
  33. .crc32 = 0, /* Ignored by Linux Kernel. */
  34. .reserved = 0
  35. },
  36. .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */
  37. .fw_revision = 0, /* Initialized later. */
  38. .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  39. .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  40. .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  41. .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  42. .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  43. .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
  44. .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
  45. /* Not used under Xen. */
  46. .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
  47. /* Not used under Xen. */
  48. .nr_tables = 0, /* Initialized later. */
  49. .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */
  50. };
  51. static const struct efi efi_xen __initconst = {
  52. .systab = NULL, /* Initialized later. */
  53. .runtime_version = 0, /* Initialized later. */
  54. .mps = EFI_INVALID_TABLE_ADDR,
  55. .acpi = EFI_INVALID_TABLE_ADDR,
  56. .acpi20 = EFI_INVALID_TABLE_ADDR,
  57. .smbios = EFI_INVALID_TABLE_ADDR,
  58. .smbios3 = EFI_INVALID_TABLE_ADDR,
  59. .sal_systab = EFI_INVALID_TABLE_ADDR,
  60. .boot_info = EFI_INVALID_TABLE_ADDR,
  61. .hcdp = EFI_INVALID_TABLE_ADDR,
  62. .uga = EFI_INVALID_TABLE_ADDR,
  63. .uv_systab = EFI_INVALID_TABLE_ADDR,
  64. .fw_vendor = EFI_INVALID_TABLE_ADDR,
  65. .runtime = EFI_INVALID_TABLE_ADDR,
  66. .config_table = EFI_INVALID_TABLE_ADDR,
  67. .get_time = xen_efi_get_time,
  68. .set_time = xen_efi_set_time,
  69. .get_wakeup_time = xen_efi_get_wakeup_time,
  70. .set_wakeup_time = xen_efi_set_wakeup_time,
  71. .get_variable = xen_efi_get_variable,
  72. .get_next_variable = xen_efi_get_next_variable,
  73. .set_variable = xen_efi_set_variable,
  74. .query_variable_info = xen_efi_query_variable_info,
  75. .update_capsule = xen_efi_update_capsule,
  76. .query_capsule_caps = xen_efi_query_capsule_caps,
  77. .get_next_high_mono_count = xen_efi_get_next_high_mono_count,
  78. .reset_system = NULL, /* Functionality provided by Xen. */
  79. .set_virtual_address_map = NULL, /* Not used under Xen. */
  80. .flags = 0 /* Initialized later. */
  81. };
  82. static efi_system_table_t __init *xen_efi_probe(void)
  83. {
  84. struct xen_platform_op op = {
  85. .cmd = XENPF_firmware_info,
  86. .u.firmware_info = {
  87. .type = XEN_FW_EFI_INFO,
  88. .index = XEN_FW_EFI_CONFIG_TABLE
  89. }
  90. };
  91. union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
  92. if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
  93. return NULL;
  94. /* Here we know that Xen runs on EFI platform. */
  95. efi = efi_xen;
  96. efi_systab_xen.tables = info->cfg.addr;
  97. efi_systab_xen.nr_tables = info->cfg.nent;
  98. op.cmd = XENPF_firmware_info;
  99. op.u.firmware_info.type = XEN_FW_EFI_INFO;
  100. op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
  101. info->vendor.bufsz = sizeof(vendor);
  102. set_xen_guest_handle(info->vendor.name, vendor);
  103. if (HYPERVISOR_platform_op(&op) == 0) {
  104. efi_systab_xen.fw_vendor = __pa_symbol(vendor);
  105. efi_systab_xen.fw_revision = info->vendor.revision;
  106. } else
  107. efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
  108. op.cmd = XENPF_firmware_info;
  109. op.u.firmware_info.type = XEN_FW_EFI_INFO;
  110. op.u.firmware_info.index = XEN_FW_EFI_VERSION;
  111. if (HYPERVISOR_platform_op(&op) == 0)
  112. efi_systab_xen.hdr.revision = info->version;
  113. op.cmd = XENPF_firmware_info;
  114. op.u.firmware_info.type = XEN_FW_EFI_INFO;
  115. op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
  116. if (HYPERVISOR_platform_op(&op) == 0)
  117. efi.runtime_version = info->version;
  118. return &efi_systab_xen;
  119. }
  120. void __init xen_efi_init(void)
  121. {
  122. efi_system_table_t *efi_systab_xen;
  123. efi_systab_xen = xen_efi_probe();
  124. if (efi_systab_xen == NULL)
  125. return;
  126. strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen",
  127. sizeof(boot_params.efi_info.efi_loader_signature));
  128. boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen);
  129. boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32);
  130. set_bit(EFI_BOOT, &efi.flags);
  131. set_bit(EFI_PARAVIRT, &efi.flags);
  132. set_bit(EFI_64BIT, &efi.flags);
  133. }