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 18 #include <linux/bitops.h> 19 #include <linux/efi.h> 20 #include <linux/init.h> 21 #include <linux/string.h> 22 23 #include <xen/xen.h> 24 #include <xen/xen-ops.h> 25 #include <xen/interface/platform.h> 26 27 #include <asm/page.h> 28 #include <asm/setup.h> 29 #include <asm/xen/hypercall.h> 30 31 static efi_char16_t vendor[100] __initdata; 32 33 static efi_system_table_t efi_systab_xen __initdata = { 34 .hdr = { 35 .signature = EFI_SYSTEM_TABLE_SIGNATURE, 36 .revision = 0, /* Initialized later. */ 37 .headersize = 0, /* Ignored by Linux Kernel. */ 38 .crc32 = 0, /* Ignored by Linux Kernel. */ 39 .reserved = 0 40 }, 41 .fw_vendor = EFI_INVALID_TABLE_ADDR, /* Initialized later. */ 42 .fw_revision = 0, /* Initialized later. */ 43 .con_in_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 44 .con_in = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 45 .con_out_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 46 .con_out = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 47 .stderr_handle = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 48 .stderr = EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */ 49 .runtime = (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR, 50 /* Not used under Xen. */ 51 .boottime = (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR, 52 /* Not used under Xen. */ 53 .nr_tables = 0, /* Initialized later. */ 54 .tables = EFI_INVALID_TABLE_ADDR /* Initialized later. */ 55 }; 56 57 static const struct efi efi_xen __initconst = { 58 .systab = NULL, /* Initialized later. */ 59 .runtime_version = 0, /* Initialized later. */ 60 .mps = EFI_INVALID_TABLE_ADDR, 61 .acpi = EFI_INVALID_TABLE_ADDR, 62 .acpi20 = EFI_INVALID_TABLE_ADDR, 63 .smbios = EFI_INVALID_TABLE_ADDR, 64 .smbios3 = EFI_INVALID_TABLE_ADDR, 65 .sal_systab = EFI_INVALID_TABLE_ADDR, 66 .boot_info = EFI_INVALID_TABLE_ADDR, 67 .hcdp = EFI_INVALID_TABLE_ADDR, 68 .uga = EFI_INVALID_TABLE_ADDR, 69 .uv_systab = EFI_INVALID_TABLE_ADDR, 70 .fw_vendor = EFI_INVALID_TABLE_ADDR, 71 .runtime = EFI_INVALID_TABLE_ADDR, 72 .config_table = EFI_INVALID_TABLE_ADDR, 73 .get_time = xen_efi_get_time, 74 .set_time = xen_efi_set_time, 75 .get_wakeup_time = xen_efi_get_wakeup_time, 76 .set_wakeup_time = xen_efi_set_wakeup_time, 77 .get_variable = xen_efi_get_variable, 78 .get_next_variable = xen_efi_get_next_variable, 79 .set_variable = xen_efi_set_variable, 80 .query_variable_info = xen_efi_query_variable_info, 81 .update_capsule = xen_efi_update_capsule, 82 .query_capsule_caps = xen_efi_query_capsule_caps, 83 .get_next_high_mono_count = xen_efi_get_next_high_mono_count, 84 .reset_system = NULL, /* Functionality provided by Xen. */ 85 .set_virtual_address_map = NULL, /* Not used under Xen. */ 86 .flags = 0 /* Initialized later. */ 87 }; 88 89 static efi_system_table_t __init *xen_efi_probe(void) 90 { 91 struct xen_platform_op op = { 92 .cmd = XENPF_firmware_info, 93 .u.firmware_info = { 94 .type = XEN_FW_EFI_INFO, 95 .index = XEN_FW_EFI_CONFIG_TABLE 96 } 97 }; 98 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info; 99 100 if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0) 101 return NULL; 102 103 /* Here we know that Xen runs on EFI platform. */ 104 105 efi = efi_xen; 106 107 efi_systab_xen.tables = info->cfg.addr; 108 efi_systab_xen.nr_tables = info->cfg.nent; 109 110 op.cmd = XENPF_firmware_info; 111 op.u.firmware_info.type = XEN_FW_EFI_INFO; 112 op.u.firmware_info.index = XEN_FW_EFI_VENDOR; 113 info->vendor.bufsz = sizeof(vendor); 114 set_xen_guest_handle(info->vendor.name, vendor); 115 116 if (HYPERVISOR_platform_op(&op) == 0) { 117 efi_systab_xen.fw_vendor = __pa_symbol(vendor); 118 efi_systab_xen.fw_revision = info->vendor.revision; 119 } else 120 efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN"); 121 122 op.cmd = XENPF_firmware_info; 123 op.u.firmware_info.type = XEN_FW_EFI_INFO; 124 op.u.firmware_info.index = XEN_FW_EFI_VERSION; 125 126 if (HYPERVISOR_platform_op(&op) == 0) 127 efi_systab_xen.hdr.revision = info->version; 128 129 op.cmd = XENPF_firmware_info; 130 op.u.firmware_info.type = XEN_FW_EFI_INFO; 131 op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION; 132 133 if (HYPERVISOR_platform_op(&op) == 0) 134 efi.runtime_version = info->version; 135 136 return &efi_systab_xen; 137 } 138 139 void __init xen_efi_init(void) 140 { 141 efi_system_table_t *efi_systab_xen; 142 143 efi_systab_xen = xen_efi_probe(); 144 145 if (efi_systab_xen == NULL) 146 return; 147 148 strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen", 149 sizeof(boot_params.efi_info.efi_loader_signature)); 150 boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen); 151 boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); 152 153 set_bit(EFI_BOOT, &efi.flags); 154 set_bit(EFI_PARAVIRT, &efi.flags); 155 set_bit(EFI_64BIT, &efi.flags); 156 } 157