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 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_platform_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 EXPORT_SYMBOL_GPL(xen_efi_get_time); 63 64 efi_status_t xen_efi_set_time(efi_time_t *tm) 65 { 66 struct xen_platform_op op = INIT_EFI_OP(set_time); 67 68 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time)); 69 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm)); 70 71 if (HYPERVISOR_platform_op(&op) < 0) 72 return EFI_UNSUPPORTED; 73 74 return efi_data(op).status; 75 } 76 EXPORT_SYMBOL_GPL(xen_efi_set_time); 77 78 efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending, 79 efi_time_t *tm) 80 { 81 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time); 82 83 if (HYPERVISOR_platform_op(&op) < 0) 84 return EFI_UNSUPPORTED; 85 86 if (tm) { 87 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time)); 88 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm)); 89 } 90 91 if (enabled) 92 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED); 93 94 if (pending) 95 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING); 96 97 return efi_data(op).status; 98 } 99 EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time); 100 101 efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm) 102 { 103 struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time); 104 105 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time)); 106 if (enabled) 107 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE; 108 if (tm) 109 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm)); 110 else 111 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY; 112 113 if (HYPERVISOR_platform_op(&op) < 0) 114 return EFI_UNSUPPORTED; 115 116 return efi_data(op).status; 117 } 118 EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time); 119 120 efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor, 121 u32 *attr, unsigned long *data_size, 122 void *data) 123 { 124 struct xen_platform_op op = INIT_EFI_OP(get_variable); 125 126 set_xen_guest_handle(efi_data(op).u.get_variable.name, name); 127 BUILD_BUG_ON(sizeof(*vendor) != 128 sizeof(efi_data(op).u.get_variable.vendor_guid)); 129 memcpy(&efi_data(op).u.get_variable.vendor_guid, vendor, sizeof(*vendor)); 130 efi_data(op).u.get_variable.size = *data_size; 131 set_xen_guest_handle(efi_data(op).u.get_variable.data, data); 132 133 if (HYPERVISOR_platform_op(&op) < 0) 134 return EFI_UNSUPPORTED; 135 136 *data_size = efi_data(op).u.get_variable.size; 137 if (attr) 138 *attr = efi_data(op).misc; 139 140 return efi_data(op).status; 141 } 142 EXPORT_SYMBOL_GPL(xen_efi_get_variable); 143 144 efi_status_t xen_efi_get_next_variable(unsigned long *name_size, 145 efi_char16_t *name, 146 efi_guid_t *vendor) 147 { 148 struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name); 149 150 efi_data(op).u.get_next_variable_name.size = *name_size; 151 set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name); 152 BUILD_BUG_ON(sizeof(*vendor) != 153 sizeof(efi_data(op).u.get_next_variable_name.vendor_guid)); 154 memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor, 155 sizeof(*vendor)); 156 157 if (HYPERVISOR_platform_op(&op) < 0) 158 return EFI_UNSUPPORTED; 159 160 *name_size = efi_data(op).u.get_next_variable_name.size; 161 memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid, 162 sizeof(*vendor)); 163 164 return efi_data(op).status; 165 } 166 EXPORT_SYMBOL_GPL(xen_efi_get_next_variable); 167 168 efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor, 169 u32 attr, unsigned long data_size, 170 void *data) 171 { 172 struct xen_platform_op op = INIT_EFI_OP(set_variable); 173 174 set_xen_guest_handle(efi_data(op).u.set_variable.name, name); 175 efi_data(op).misc = attr; 176 BUILD_BUG_ON(sizeof(*vendor) != 177 sizeof(efi_data(op).u.set_variable.vendor_guid)); 178 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor)); 179 efi_data(op).u.set_variable.size = data_size; 180 set_xen_guest_handle(efi_data(op).u.set_variable.data, data); 181 182 if (HYPERVISOR_platform_op(&op) < 0) 183 return EFI_UNSUPPORTED; 184 185 return efi_data(op).status; 186 } 187 EXPORT_SYMBOL_GPL(xen_efi_set_variable); 188 189 efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space, 190 u64 *remaining_space, 191 u64 *max_variable_size) 192 { 193 struct xen_platform_op op = INIT_EFI_OP(query_variable_info); 194 195 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 196 return EFI_UNSUPPORTED; 197 198 efi_data(op).u.query_variable_info.attr = attr; 199 200 if (HYPERVISOR_platform_op(&op) < 0) 201 return EFI_UNSUPPORTED; 202 203 *storage_space = efi_data(op).u.query_variable_info.max_store_size; 204 *remaining_space = efi_data(op).u.query_variable_info.remain_store_size; 205 *max_variable_size = efi_data(op).u.query_variable_info.max_size; 206 207 return efi_data(op).status; 208 } 209 EXPORT_SYMBOL_GPL(xen_efi_query_variable_info); 210 211 efi_status_t xen_efi_get_next_high_mono_count(u32 *count) 212 { 213 struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count); 214 215 if (HYPERVISOR_platform_op(&op) < 0) 216 return EFI_UNSUPPORTED; 217 218 *count = efi_data(op).misc; 219 220 return efi_data(op).status; 221 } 222 EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count); 223 224 efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules, 225 unsigned long count, unsigned long sg_list) 226 { 227 struct xen_platform_op op = INIT_EFI_OP(update_capsule); 228 229 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 230 return EFI_UNSUPPORTED; 231 232 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array, 233 capsules); 234 efi_data(op).u.update_capsule.capsule_count = count; 235 efi_data(op).u.update_capsule.sg_list = sg_list; 236 237 if (HYPERVISOR_platform_op(&op) < 0) 238 return EFI_UNSUPPORTED; 239 240 return efi_data(op).status; 241 } 242 EXPORT_SYMBOL_GPL(xen_efi_update_capsule); 243 244 efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules, 245 unsigned long count, u64 *max_size, 246 int *reset_type) 247 { 248 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities); 249 250 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) 251 return EFI_UNSUPPORTED; 252 253 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array, 254 capsules); 255 efi_data(op).u.query_capsule_capabilities.capsule_count = count; 256 257 if (HYPERVISOR_platform_op(&op) < 0) 258 return EFI_UNSUPPORTED; 259 260 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size; 261 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type; 262 263 return efi_data(op).status; 264 } 265 EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps); 266