356 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * EFI support for Xen.4 *5 * Copyright (C) 1999 VA Linux Systems6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>7 * Copyright (C) 1999-2002 Hewlett-Packard Co.8 * David Mosberger-Tang <davidm@hpl.hp.com>9 * Stephane Eranian <eranian@hpl.hp.com>10 * Copyright (C) 2005-2008 Intel Co.11 * Fenghua Yu <fenghua.yu@intel.com>12 * Bibo Mao <bibo.mao@intel.com>13 * Chandramouli Narayanan <mouli@linux.intel.com>14 * Huang Ying <ying.huang@intel.com>15 * Copyright (C) 2011 Novell Co.16 * Jan Beulich <JBeulich@suse.com>17 * Copyright (C) 2011-2012 Oracle Co.18 * Liang Tang <liang.tang@oracle.com>19 * Copyright (c) 2014 Oracle Co., Daniel Kiper20 */21 22#include <linux/bug.h>23#include <linux/efi.h>24#include <linux/init.h>25#include <linux/string.h>26 27#include <xen/interface/xen.h>28#include <xen/interface/platform.h>29#include <xen/page.h>30#include <xen/xen.h>31#include <xen/xen-ops.h>32 33#include <asm/page.h>34 35#include <asm/xen/hypercall.h>36 37#define INIT_EFI_OP(name) \38 {.cmd = XENPF_efi_runtime_call, \39 .u.efi_runtime_call.function = XEN_EFI_##name, \40 .u.efi_runtime_call.misc = 0}41 42#define efi_data(op) (op.u.efi_runtime_call)43 44static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)45{46 struct xen_platform_op op = INIT_EFI_OP(get_time);47 48 if (HYPERVISOR_platform_op(&op) < 0)49 return EFI_UNSUPPORTED;50 51 if (tm) {52 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_time.time));53 memcpy(tm, &efi_data(op).u.get_time.time, sizeof(*tm));54 }55 56 if (tc) {57 tc->resolution = efi_data(op).u.get_time.resolution;58 tc->accuracy = efi_data(op).u.get_time.accuracy;59 tc->sets_to_zero = !!(efi_data(op).misc &60 XEN_EFI_GET_TIME_SET_CLEARS_NS);61 }62 63 return efi_data(op).status;64}65 66static efi_status_t xen_efi_set_time(efi_time_t *tm)67{68 struct xen_platform_op op = INIT_EFI_OP(set_time);69 70 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_time));71 memcpy(&efi_data(op).u.set_time, tm, sizeof(*tm));72 73 if (HYPERVISOR_platform_op(&op) < 0)74 return EFI_UNSUPPORTED;75 76 return efi_data(op).status;77}78 79static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,80 efi_bool_t *pending,81 efi_time_t *tm)82{83 struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);84 85 if (HYPERVISOR_platform_op(&op) < 0)86 return EFI_UNSUPPORTED;87 88 if (tm) {89 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.get_wakeup_time));90 memcpy(tm, &efi_data(op).u.get_wakeup_time, sizeof(*tm));91 }92 93 if (enabled)94 *enabled = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_ENABLED);95 96 if (pending)97 *pending = !!(efi_data(op).misc & XEN_EFI_GET_WAKEUP_TIME_PENDING);98 99 return efi_data(op).status;100}101 102static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)103{104 struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);105 106 BUILD_BUG_ON(sizeof(*tm) != sizeof(efi_data(op).u.set_wakeup_time));107 if (enabled)108 efi_data(op).misc = XEN_EFI_SET_WAKEUP_TIME_ENABLE;109 if (tm)110 memcpy(&efi_data(op).u.set_wakeup_time, tm, sizeof(*tm));111 else112 efi_data(op).misc |= XEN_EFI_SET_WAKEUP_TIME_ENABLE_ONLY;113 114 if (HYPERVISOR_platform_op(&op) < 0)115 return EFI_UNSUPPORTED;116 117 return efi_data(op).status;118}119 120static 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 143static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,144 efi_char16_t *name,145 efi_guid_t *vendor)146{147 struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);148 149 efi_data(op).u.get_next_variable_name.size = *name_size;150 set_xen_guest_handle(efi_data(op).u.get_next_variable_name.name, name);151 BUILD_BUG_ON(sizeof(*vendor) !=152 sizeof(efi_data(op).u.get_next_variable_name.vendor_guid));153 memcpy(&efi_data(op).u.get_next_variable_name.vendor_guid, vendor,154 sizeof(*vendor));155 156 if (HYPERVISOR_platform_op(&op) < 0)157 return EFI_UNSUPPORTED;158 159 *name_size = efi_data(op).u.get_next_variable_name.size;160 memcpy(vendor, &efi_data(op).u.get_next_variable_name.vendor_guid,161 sizeof(*vendor));162 163 return efi_data(op).status;164}165 166static efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,167 u32 attr, unsigned long data_size,168 void *data)169{170 struct xen_platform_op op = INIT_EFI_OP(set_variable);171 172 set_xen_guest_handle(efi_data(op).u.set_variable.name, name);173 efi_data(op).misc = attr;174 BUILD_BUG_ON(sizeof(*vendor) !=175 sizeof(efi_data(op).u.set_variable.vendor_guid));176 memcpy(&efi_data(op).u.set_variable.vendor_guid, vendor, sizeof(*vendor));177 efi_data(op).u.set_variable.size = data_size;178 set_xen_guest_handle(efi_data(op).u.set_variable.data, data);179 180 if (HYPERVISOR_platform_op(&op) < 0)181 return EFI_UNSUPPORTED;182 183 return efi_data(op).status;184}185 186static efi_status_t xen_efi_query_variable_info(u32 attr, 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_platform_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 207static 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_platform_op(&op) < 0)212 return EFI_UNSUPPORTED;213 214 *count = efi_data(op).misc;215 216 return efi_data(op).status;217}218 219static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,220 unsigned long count, unsigned long sg_list)221{222 struct xen_platform_op op = INIT_EFI_OP(update_capsule);223 224 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)225 return EFI_UNSUPPORTED;226 227 set_xen_guest_handle(efi_data(op).u.update_capsule.capsule_header_array,228 capsules);229 efi_data(op).u.update_capsule.capsule_count = count;230 efi_data(op).u.update_capsule.sg_list = sg_list;231 232 if (HYPERVISOR_platform_op(&op) < 0)233 return EFI_UNSUPPORTED;234 235 return efi_data(op).status;236}237 238static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,239 unsigned long count, u64 *max_size, int *reset_type)240{241 struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);242 243 if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)244 return EFI_UNSUPPORTED;245 246 set_xen_guest_handle(efi_data(op).u.query_capsule_capabilities.capsule_header_array,247 capsules);248 efi_data(op).u.query_capsule_capabilities.capsule_count = count;249 250 if (HYPERVISOR_platform_op(&op) < 0)251 return EFI_UNSUPPORTED;252 253 *max_size = efi_data(op).u.query_capsule_capabilities.max_capsule_size;254 *reset_type = efi_data(op).u.query_capsule_capabilities.reset_type;255 256 return efi_data(op).status;257}258 259static void xen_efi_reset_system(int reset_type, efi_status_t status,260 unsigned long data_size, efi_char16_t *data)261{262 switch (reset_type) {263 case EFI_RESET_COLD:264 case EFI_RESET_WARM:265 xen_reboot(SHUTDOWN_reboot);266 break;267 case EFI_RESET_SHUTDOWN:268 xen_reboot(SHUTDOWN_poweroff);269 break;270 default:271 BUG();272 }273}274 275/*276 * Set XEN EFI runtime services function pointers. Other fields of struct efi,277 * e.g. efi.systab, will be set like normal EFI.278 */279void __init xen_efi_runtime_setup(void)280{281 efi.get_time = xen_efi_get_time;282 efi.set_time = xen_efi_set_time;283 efi.get_wakeup_time = xen_efi_get_wakeup_time;284 efi.set_wakeup_time = xen_efi_set_wakeup_time;285 efi.get_variable = xen_efi_get_variable;286 efi.get_next_variable = xen_efi_get_next_variable;287 efi.set_variable = xen_efi_set_variable;288 efi.set_variable_nonblocking = xen_efi_set_variable;289 efi.query_variable_info = xen_efi_query_variable_info;290 efi.query_variable_info_nonblocking = xen_efi_query_variable_info;291 efi.update_capsule = xen_efi_update_capsule;292 efi.query_capsule_caps = xen_efi_query_capsule_caps;293 efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;294 efi.reset_system = xen_efi_reset_system;295}296 297int efi_mem_desc_lookup(u64 phys_addr, efi_memory_desc_t *out_md)298{299 static_assert(XEN_PAGE_SHIFT == EFI_PAGE_SHIFT,300 "Mismatch between EFI_PAGE_SHIFT and XEN_PAGE_SHIFT");301 struct xen_platform_op op;302 union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;303 int rc;304 305 if (!efi_enabled(EFI_PARAVIRT) || efi_enabled(EFI_MEMMAP))306 return __efi_mem_desc_lookup(phys_addr, out_md);307 phys_addr &= ~(u64)(EFI_PAGE_SIZE - 1);308 op = (struct xen_platform_op) {309 .cmd = XENPF_firmware_info,310 .u.firmware_info = {311 .type = XEN_FW_EFI_INFO,312 .index = XEN_FW_EFI_MEM_INFO,313 .u.efi_info.mem.addr = phys_addr,314 .u.efi_info.mem.size = U64_MAX - phys_addr,315 },316 };317 318 rc = HYPERVISOR_platform_op(&op);319 if (rc) {320 pr_warn("Failed to lookup header 0x%llx in Xen memory map: error %d\n",321 phys_addr, rc);322 }323 324 out_md->phys_addr = info->mem.addr;325 out_md->num_pages = info->mem.size >> EFI_PAGE_SHIFT;326 out_md->type = info->mem.type;327 out_md->attribute = info->mem.attr;328 329 return 0;330}331 332bool __init xen_efi_config_table_is_usable(const efi_guid_t *guid,333 unsigned long table)334{335 efi_memory_desc_t md;336 int rc;337 338 if (!efi_enabled(EFI_PARAVIRT))339 return true;340 341 rc = efi_mem_desc_lookup(table, &md);342 if (rc)343 return false;344 345 switch (md.type) {346 case EFI_RUNTIME_SERVICES_CODE:347 case EFI_RUNTIME_SERVICES_DATA:348 case EFI_ACPI_RECLAIM_MEMORY:349 case EFI_ACPI_MEMORY_NVS:350 case EFI_RESERVED_TYPE:351 return true;352 default:353 return false;354 }355}356